NO OCR TEXT NO OCR TEXT Left aft hatch hides 6-oz fuel tank tar rear engine natchlfin unit rejainca wuin trappea o-a aovw-neea oumi ana iwo O-J nylon screws Right Removing front hatch reveals plywood keeper holding two wing dowels place Under Sig canopy Williams Bros pilot ready go wing bolt covers made aluminum cigar wrappers have painted match Left simple onset tail wheel tiller lessens servo shock during ground operations Right Fiberglass cowls nice addition model difficult make 4-oz weight nose cowl helps balance aft cowl may omitted desired Fuselage Use piece A-in Lite Ply 12 wide 48 long Determine whether want separate fiberglass nose cowl built-up front engine compartment opt built-up style add 4 part labeled PS front FW plan Placing Lite Ply under fuselage side view locate end points straight lines pin pressed ply Con nect points using ball-point pen Hav ing basic lines straight makes easy work drawing sides curved sec tion wing saddle can traced few pieces carbon paper slipped between plan plywood Cut out PS sand down lines shown plan Trace second side first cutting sanding outline Clamp two sides togetheror socket-head bolts attachIng cowls can reached hex ball-driver hold together small pieces masking tapewhile block sand identical size errors tracing inevi table Make sure edges square 6 x 12-in piece /16 birch ply used nose doublers F4 Use FS template Make cutout section gear mount P3 Apply very thin coat 30-minute epoxy doubler P4 position FS making sure allow firewall FW Use weights clamps until ep oxy sets Make right left fuselage side asme Haico B106-8 strut Du-Bro axle K&S 062 aluminum clip hold rugged plywood-reinforced wheel pants place sembling its respective birch nose doubler Make two aft doublers Fl 1 attach thin layer epoxy Allow correct spacing aft fire wall FR two small doublers F6 can also attached using white glue suggested sides resanded en sure upper lower edges true identical sides placed inside surface faces up carefully draw locations Fl F2 F5 F6 F7 Make firewall FW laminating A-in birch ply Cut FR X6-in birch ply Draw horizontal vertical thrust lines both sides firewall will using engines different makes pick heaviest tractor front unit engine including muf 26 Model Aviation DESIGNED BY AL MASTERS IG WC 813 CRrJOPY FI0ERGLR ccWL--pwORKW OP&BOJTOM 3A6LA GOLD8ER%RLBR_ \\ /axBf4L N / 2 _____ NGL016 pIY IV 13~gW 3/ 15 pUI y8%Y I3R$A Qj 4EET 1~ 4 C ~RVY 2 Weigh wing spars determine two heaviest Place 01 heavy spars right panel other left fler attached its mount position firewall canting counterclockwise see front view Hold thrust line indicated allow muffler clearance proper carburetor location respect fuel tank Mark drill firewall stall four 6-32 blind nuts three tend use fiberglass cowl back side aft engine side mounted exhaust down standard mount such Dave Brown 4045 can used light weight variety shown plans engine should placed close FR possible still allowing clearance Tatone EM 4Oss manifold Lite Ply spac ers can used between FR mount mount arms longer neces NOTE FRONT ENUINE INSTALLATION-TUT CHORE FOR CORRECT LOCATiON OF EARNURETOR IN RELATION TO FUEL TANR ATTACM MOUNT TO FERWALL WETTI FOUR 14-32 T-MJTS N BOLTS LOWER MATCR CR LITE PLYF13 1-1 II lOOT UTE PLYII MUFPLER LUCATIONfl I504 RALSA TRISTUCO I/S PLY 4.BOTCH FUR MAPLE MOCR IIIII I/U RALSA TRI-OSUCI I/O PLTiiAjTj I ICONSTRUCTION 010 iT - - NOTE SERVO SHOWN FROMLM PLY SERVO TRAY ELEVATOR AILERONS IRUODEU I/O PLY WOOD I/H PLT IHEMUVAMLEI 6 ~ITEj I/lU PLYPUPLY WITH F-IS I/O CITE PLYHI/lU PLY14-02 TNUT 0101EV HEAVY---2~ ATCH -- OUR IOUZI -UIIBUZI AU TWO-CYCLEFAIrSUORO S-b TUSOIOU MALSA--H \iiiEAGNEII-V TUCKI IF BALANCE IFUAMI SERVO04 L PLY WITHOUT I 1CUSYRUL MASTER AIRSCSEYR 0-14RATT LYSUPPORT GOLORERO 2 SONNER\V- 0-SO ECE1YLR 11400 EI51 TROT--I IFLUM001CR VUNISE HEAVY WALL FIREROLASS COWLP13 IA PRAX 4 00 COMPLEVEUTE PLYHATCH HALCO BlUR-UI/H -005/4 ALUM ROLl 002 005 ALUMLASOINO SEAM H OTLUS SLYTIVI LANOINO OEAR CLIPLIURTEN RAND TU FIT/ ER PLYWOOD- I/O PLY lBALSAZi4IA OOR LITE ATTOEB WITH 004-40 NUTO BOLT TO.. 145O SERER/NAT EAO _FUSELAGI VI E 000140 040 REMOVE NOT FROM RALCO UEAR TAP FOR 001400 VOLE -GZYS 010 500 04 sary should cropped off save weight Use three 4-40 blind nuts bolts install mount Remove mounts before continuing fuselage con struction Cut remaining fuselage components materials specified Note Fl A-in birch ply includes switch cut out F12 F13 shown actual length plan can traced piece Left Fuselage parts Lite Ply sides bottom conjunction birch ply balsa keep weight distribution under control No tice two pre-formed balsa skin pieces fuselage side dou blers have already glued place Above Completed basic fuselage straight lines design signify easy layout 28 Model Aviation wing ribs Irst cut out witn construc tion tabs left provide easy method building necessary wing washout Full-Size Plans Page 188 F-I2oR LITE PLYAFT ENGINE MOUNT 1/H Lire PLY SPACER ID OH 4 REOHIREBI 141 HOLES TO WATCH L/2BALSAENGINE CASE THFSTOCHI/TDA WALSH -I 052 KS S--ATTACH TO F-fl WITH LS KS/B BALSAALABINOM131 4-40 T-NUTS S BOLTS BLOCK3/8 SOFT BALSA TAP FOR I/O-ZOkS/H 010 FIHEHOLASS COWLSPINNER -I -flE-KAF-Il III iCANOPT- COCKPIT AREA IAIII III I I _ -II __IIIII I I/ZBALSAI OW PL F-Nil I11 ...I II THFSTOCK HATCH TONGUE - I F-ri II 711 UiI i -----ZINOES 10 K Fl/A H-SO RH HALTEPOXYOx 3/4 BALSAPOSHEK PHOP TRAPPED E TOP VIEW EPOOTPSAS SYWAW'\I/B LITE PLY 1/1K PLY--.....WAKE I/H TM-STOCK I 3HBALSA0TRIBTO L~--IF-SROBART DOW F-SL_________IT-NOT K-D2 IEPOOTIOs HEMOVE FOR FOEL illiiiTANK ACCESS IIIII pF-6Ul II 04A IRE ORR IN PkASYIC ISO 121 SODA BALSA F-R 1540KF-fl T I-P/KS/IS PLYWOND Fl-Ia 3 I/2T ____ 2-I/H L 1/2 3-I/O 3/sO WOSIC WISE -1/1K PLYWOOR - R 156 50 040K lOSSO 1OYEW MWSOWER IAFTER UFE OP WITH 15K SQ BRASSASH TO SHAPE TUBENOTE RUBBERS AWE 0*EL A2EAEJaLI I42AALKZ2RN 125 50 BRASS _____I/U BALSA SHEETTUBE SHER MW HODDEK ISOFTISOLDEK - 'I/IHPLTWOOO I/H LITE PLY SPOCEKS 3/32 BALSA-NBLENO 3/32 I-D4 AlASHEET7AT WATER 2 TI -.LL/TUPTYHO FOR B52 NYLONFS SCREW 121 STABILIZEHi~ -1/1K PLYWOHO LS LITE PLY NOTE AFT EWAIRE COWL IS USHT WEIGUT- LAYER H DO LOATH PLUS LAYER 2 02 OLSON AFT EWAINE 500k ALL BATEHIAL MEDIUM BALSA ARLESS SPECIFIED OTHER Sb WC HID CANOPY RE-WORKEOI niN - FRAY F-7"HATCH BALSAII F-00F-B STOCK vzziU ALL LYBx 3/4I --. SOFT BALSA FILL F-HTIWVOKD/B.-24T1 ALSAI________ __________________-N I/ZBALSA F-Il 01 "CLuRK FOG THI-STOCK .----Io --STABILIZ VL SOALSOWALSA I/BBRLSA R-BLOCK SHEET I/O BALSA THI-STOCKF-6ALS PLC T AID- H HEOKIHEB~----4-40 BOLT-REROOC HEAD OR 1/H LITE PLY PLY N ESOAKS/AF-90TH 00 BALSA BALSABASIC WIRE IEf7iLSOFT BALSA PLYCLUMP N SLOE FILL --1SPECIFICAT IONS - SECT A SAWS WING SPUN HO COT OOT AFTER/550 AREA SQ 14 3/52 BALSA SHEETZNZATTASH AFT-PLYWOWOWEISHY IFUELEDI 9 LSC HDZ ASSES BLY IW PLYMAKE 2WISH LSAOINU OZ AIRFOIL.IH 7 SERI-SYM 34K BALSA SHEET L/$3JWITB WASHOUT POWER TWO 00 ENOIRED F-IaF- IF-S-HATCH2-CYCLE TeNUE F-H BLITE PLY 121 MODEL AVIATION PUSH-PULL 240 TWIN ENGINE R/C MODEL DESIGNED BY AL MASTERS TRACING BY JOE DEMARCO sanded correct outline cut apart finished components should include drawn centerlines aid lineup during sembly Cut lightening holes F12 af ter separating F13 Glue six con struction aids F12 Make preformed 3A2 balsa skin aft fuselage section will need some household ammonia cardboard tube approximately three-inch diameter core tube Christmas wrapping paper works fine Left The wing panel begins take shape has turned over show construction tabs Above bare bones horizontal tall show lightweight structure Because engine vi bration1 must rugged conventional model April 1989 29 upper rudder fitted square brass tube assembles lower rud der tall wheel hatch offers easy ac cess fuel tank supplying aft engine Wheel pants cut 1-in balsa block reinforced 1/-in birch ply carve nice streamline shape ex tra drag helps slow model down during landing model twin has frontal drag single-engine model finished nose cowl foam plug roughed-out aft cowl plug aft cowl can omitted front cowl adds 4 oz much needed nose weight lightweight aft engine mount used help get right CG Select two 7-in lengths /32 sheet 6-in-wide stock Trim balsa 5in width soak ammonia STABILIZERS/B SO BALSA LEADING LEFT STABILIZER STARRI PA CITE PLY BEFORE I/B lI/A BALSA~OsA SEE SHEET RIBS ORE OBOESTRISTOCK VBx I/A BALSA RIB SUPPORT I2OBALS S/IHZ I/OFiLL BALSAJ 7BABORT3OBI/OSA HOBOij BALSA SPAR CSCRAP BALSA 01 I/Bx I/O BIB SUPTS015 ALA /1/ AOR PETLOWER SURFASE INSET / 3/0 SOFT BALSA SHEET S/TOZZRALSASHLfl IBS-SAEETI NOT SBOSAN OR LEFT / ROSA SARIS1/5 50 OARS 3/32 SCRAPTA CONTOURBALSA BALSA RIBSvO BALSA SHEET BATE TRIAL FIT STAR TO VFOSELAAE BEFORE ATTACRIRS VA SO BALSA I FILLELEV-STAB SECTI LVI I/A BALSA I COVERING STAB IIAVA SCREAj~ PUT 7ORILL FOR ipL5/32 B BI I/A BALSA LEASISS OIS ALUMEASEy 0/01122n-p-iiBALSA /_____UWING ____ I_ ~1I _____ PLAN TOP VIEW _______I BALSASBIItZ BALSA 5/52 BALSAI I/B xl BALSA LE3/Az OBEET RIRIO V4x S/B I/B I/O BALSABALSA SOB LEABISA EPSEI/H BALSA2 RISER 5PM SHEETWITHOUT CAP S/SO RALSAVA 120BALSA WISE SHEETINGSPARS 5/52 BALSA least five minutes Blot wood pa per towel wrap around tube using masking tape hold place Set balsa skin aside allow air dry thor oughly Save ammonia another proj ect Begin assembling fuselage over top view plan Support sides up right glue firewall place using F5 spacer Use white glue since will allow time lining everything up Place weight such ordinary brick top front edges fuselage sides clamp FW place pull aft fuselage section together time lower fuselage line forward F5 straight weight will keep setup square work surface until glue sets Attach FR using white glue 10-minute epoxy aid clamp Hold sides together attach F6 cyanoac rylate CyA Add two 14 x %-in crosspieces fit Fl 1 Check position WINO L DIHEDRAL DETAIL NOT SCALE F5 tack CyA Make relief notches Fl clear blind nuts back side FW Force Fl position will aid correcting misalignment front firewall F5 attach CyA Install /6 x A-in hardwood servo rails make servo tray A-in ply fit After gluing F3 place set fuselage asideyoull com pleting laterand proceed wing Wing Trace cut set ribs using pattern make second set Fin ish sand ribs pairs draw chord lines shown both sides rib Cut dihedral braces draw two centerlines indicated both sides leading edge brace Cover wing plan wax paper plastic film before pro ceeding Cut four straight x A-in balsa spars length point weigh four pieces distribute spars avoid using LS 1122 SUB LEAGIRS EDGE 30 Model Aviation Due heavy side loads engine weight necessary use birch ply hardwood lower tail post system Note soldered upper lower torque rods Full-Size Plans Available Page 188 I/B BALSA REMOVE FOR SERVOSMEET IFI 2 Q1 — U AILERON SERVO-L SOFO RULVA- 01 LI lb 0I RALSA OREET IOFT ALSA SO EDGE S/IA DIA DOWELS WINO SOLO SOWN I] NOTE BIBS 2 TRRU 12 ABE 5/32 BALSA SHEET 3 [I 45678910II12 111 II r I OR BALSA SHEET WISH YIP FRAMES I/R PLVWDODV UPPERI/R PLYWOOD_______ I/R LITE PLO1QWiR t __ LEADING EDGE VA PLYWOOD S/DO RALSA SHEET TVP H BOVVOMjSERVO DOONYDIHEDRABRACESWING TIP DETAIL HAL NA S/HI/O /0 BALSA1II______ 71 FILLHOII WINO BOLT PLY4 ACCESS I/O BALSA SUBEE -PUSHPULL 240 3/BR I/O OIL STOCHL --TWIN ENGINE R/C MODEL RI LIGHTENINS ROLES ISV BTA FUSELAGEI/IS BALSA SHEETDESIGNED BY AL MASTERS SIDEBATH SIDESWORK SURFACE I254NTRACING BY OE DEMARCO IIIII ALL RIGHTS RESERVED FILL ISO MUSIC IKE EPOOVI / I/B BRASS TUBE EPOXY TO OK aileron servo carried well forward wing Z-bends A-ln music wire pushrods used connect servo Arm II I-V117j4I TRI-STOCEILIli-TiI #~p Iftv 11-----S I/B LIVEF4[~SRWVAII DLV April 1989 31 receiver battery pack three servos nestled lower nose section below 12oz front fuel tank dual take-offs 5-26 servo controls throttles both engines Left Both K&B 40 05 4OFP have used tor tne aft engine witn equal success Lite Ply spacers firewall provide clearance Tatone manifold Right fuel tank nose compartment sealed keep fuel leaking electronics below two heaviest same wing panel postal scale coding used Glue lower ply dihedral brace spar halves position spar over plan securing pins weights Position ribs 1 through 12 spar making sure construction tabs resting work surface x %-in trailing edge x /2-in leading edge pinned place ribs aid lineup space between ribs 1 2 pro vides leading edge brace will slipped later After making sure ribs perpen dicular work surface CyA ribs spar leading edge trailing edge Fit upper spar glue place Block sand upper surface trailing edge slightly follow rib contours Select four sheets %2 balsa 2-in stock upper lower trailing edge skins Check weights using two heaviest opposite panels Hold metal yardstick edgewise across ribs board sheet edge certain sheet line will straight attached ribs high rib can carefully sanded down dont worry about low rib point Turn wing over Using piece wood such ruler press wing down ward contact %2 sheet bond ribs CyA Work about three ribs time starting rib 1 skipping low ribs Maintaining straight sheet line out waves important gluing rib chip A-in triangle stock can used support skin low rib cap strips added later will hide multi tude construction errors Build wing tip attach rib 12 Center tip rib chord line leading edge 4 x %-in trailing edge balsa filler trailing edge tip will allow block sanding fit con tours %2 sheet aileron Attach tip webs will final sanded after rib caps place Add four hinge supports vertical-grain %2 spar webs between ribs 3 12 Fit rib iF place panel inch off work surface rib 12 set iF perpendicular work surface glue trailing edge spar notch tack gluing leading edge Note iF shown actual length plan reaches leading edge strip Allow space spar notches fit dihedral brace mating spars later Set panel aside construct oppo site panel similar manner completed second panel work surface fit two panels together El evate first panel 2 per draw ing push lower spars together until butt Slightly bevel spar end ob tain good fit upper dihedral brace slipped alongside upper spars clamped using least two clamps side wing centerline Make sure %-in dihedral brace fits flush slightly below spars sanding down later will difficult Add leading edge ply brace clamping same manner Rib iF will have razor sawed shorter Make sure horizontal centerline leading edge di hedral brace located correctly ribs 1 2 both panels bottom edge of servo mount sec Continued page 34 32 Model Aviation finished model resting authors balancing rack Location correct cxi shoula always determined model before making first trip out flying field idea RC Push-Pull 240 came WW Ii Dornier-335 Reported worlds fastest propeller-driven aircraft its time war ended before could made operational youve ever fuel tank split leak fuel fuselage know important install tank can trust Du-Bro Products manufactures complete line rugged polypropylene tanks 10 convenient sizes 2oz 24 oz guaranteed life against splitting leaking money back tank comes complete soft brass tubing hardware Protruding front lip prevents fuel lines being crimped hard landings Single twin vent design gas conversion stopper available use tank gasoline Cat No 400 Visit local Hobby Shop fuel hook up accessories can Cap Fittings In-Line Fuel Filter 0 Fuel Tubing Kwik Fill Fuel Value Gas Gb Fuel Tank Filter KwkF Fue Pump tion should parallel work sur face wing level upper spar leading edge clamped rear section wing panels butted trailing edge make final check spars run straight tip tip Hit ar eas CyA Carefully turn wing over clamp lower dihedral brace two clamps CyA Add four 3A-in triangle braces ribs 1 2 Complete center section shear webbing cut off con struction tabs Add balsa filler blocks trailing edge bays between ribs 1 iF Carve notch bottom iF accept W2 Install latter gluing flush bottom rib 1 Remove section iF accommodate aileron servo location Wl can shifted neces sary allow space aileron servo stall Wi add A-in triangles support W2 upper lower leading edge sheets attached /16 overhang leadmg edges Wetting outside surface sheets will make forming easier sheet edges will block sanded until leading edge provide flat gluing surface x 1-in leading edge cap Fasten -in -thick scrap spacer along leading edge masking tape Place wing fuselage check saddle area fit Remove wing epoxy hardwood hold-down blocks place temporary x -in cross brace glued near blocks fuselage side support epoxy has cured align wing fuselage hold place masking tape Drill through W2 hardwood blocks Y6 bit held perpen dicular W2 Remove wing re drill W2 A-in bit Tap blocks A-20 wing bolts Bolt wing place drill two s through F5 leading edge Wi Trial fit two /, dowels shown plan Use soft balsa foam filler around the wing bolt holes sanding down center section top sheeting Remove dowls complete wing sheeting rib caps leading edge cap Drill through leading edge cap /16 bit two dowels epoxied after wing has covered Ailerons Cut two aileron cores 3/ x 1-in aileron stock After making lightening holes cover ailerons /l6 sheet balsa Drill four holes hinge pins 1-in bit drill %2 hole torque rod Transfer hinge locations wing drill Trial fit ailerons hinge pins /2 torque rod assemblies alignment correct epoxy brass tubes onto wing trailing edge Remove ailerons final sanding covering Fuselage-wing assembly rmal fuse lage construction Razor saw two slots 34 Model Aviation top F5 sand accept wing dowels make /6 drilled holes oversized dowels inserted bolt wing place Lay small piece wood across top dowels trace its lower edge line location F5 Move down /16 below line just made fit piece A-in ply between dowel holes epoxy F5 Epoxy 3A-in triangle brace under ply Drill /16 hole center through ply tap A-20 bolt Treat hole CyA A-in ply wing hold-down has A-in drilled hole see drawing detail Cut two fuselage trim pieces / x % x 15 long medium-hard balsa Glue top FS extend yond FR about 4 dont glue beyond F7 Make /16 notch trim piece allow pulled together slightly behind FR secured rub berband tape Slip piece wax paper between FR FlO clamp FlO FR Glue FlO trim pieces being careful bond latter FS Cut piece x M-in balsa width F7A Add /16 ply top drill 140 hole #27 bit shown Glue x s-in piece top trim piec es F7 Glue F7A top crosspiece after fitting over /16 ply stall 1 A-in-long 6-32 socket-head bolt washer through 140 hole Use small piece tape keep bolt fall ing out Trim section preformed %2 skin fit between F7 FR overlapping both slight ly Sand bottom edges theyre alignment top trim pieces mate F7A FlO CyA skin trim pieces Aft hatch Razor saw remove aft ex tensions trim pieces cut through F7 Remove hatch section com plete application CyA F7A FlO piece plastic soda straw epoxied place will keep 6-32 bolt trapped Sand %2 skin flush F7A Install F8 F9 through slots cut formed skin Small pieces triangle stock add final rigidity unit Complete hatch front hold-down placing piece /16 ply 6-32 blind nut under two x 3A-in fuselage crosspieces Line up hatch snug up 632 bolt Use Du-Bro ball wrench inserted through small hole skin CyA ply place remove hatch epoxy ply cross members two /16 ply aft hold-down tongues installed follows Shave off excess material inside hatch trim piec es 6-32 bolt masking tape rear holding hatch place work through opening fuselage bottom Position ply tongues tack CyA F9 %2 sheet bond FS Remove hatch ep oxy tongues Again bolt hatch secure Continued page 136 EffectiveJanuary 1989 Fox motors except Combat supplied muffien some time have using soft sell approach columns customers direct some excerpts letters have received Eric larson Pine Grove CA Fox Mfq Yesterday bought Fox 4OBB Delux thefirst Fox engine have owned some apprehension bought anything other OS engine have burned before buying off brand engines Today am convened Fox 40 40SF similar both start idle magnfkenrly cant tell dfference power thats similarities end Fox 40 vibrates less easier adjust lighter comes great spinner costs hoff much American made hove now made sure everyone myflying club knovs what great buy Fox engines THANK YOU FOR QUALITY PRODUCT Eric Branham Paris IL r purchasing 40 Delux year lam impressed performs exceptional lot better OS Are planning replace Eagle III update 60 size will assured will first line purchase Jon Armitage Indiana PA ed send letter praise about motors motors used flew C/L FE started RC about year ago decided try Super Tiger 25 0S4 Stroke 40 good came bock Fox power quality handling allot decent price engines popular field Will Sgarlat Cape Cod MA note tbonksfor youve donefor wonde4izl hobby yourflne engines Dukes Mixture column temfic service offer us accidentally smash up Fox engines beyond what theyd care tackle repair Westley Keller Gouster OH have meaning drop linefor some time 40 motor trouble replaced put icing cake will never run anything planes unless says Fox side performance service says subject Decals present time am running 8 Fox engines am requesting Decals accordingly Alse lam lookingforsvard coming Eagle 4 Keep going best engines world Barry Doughty Absecon NJ placed old OS Max 60 Clipped Wing Cub Top Elite new Fox SOBA WOW what engine no vibration started right out box no adjustments Idled good accelerarionfrom idle full bock reenfic Weight bigfactor purchasing SOBBRC lighter OS SuperTigre Come etc Also must add replacement parts economical foreign imports Coming landing motor idled down beautifully settled infor great landing Again engine something else loads power very easy onfuelfor SO size engine John Holder Ob Seeverson AL ne obviously drfective else would have pulled wings off Aerostor 40 Seriously very pleased myfirse Fox engine Vaughn Kempf Modern Hobbies Miles City MI wanted take afew minutes send afew wards praise way talked three customers buying Fox 4OBB Delux motors quite impressed motors have couple observations pass along First havefound performancefigures seem little conservative modest measuring 14000 plus Master Airscrew 10 x 6 props using Royol Pro Tachfor readings Idle lower other 40 Ive ever ron realiable during spins soaps inverted idling Kenneth Wilson Schenectady NY know lam loyal satisfied Fox engine user over years Ive owned U/C 36 Fox R/C engines such Fox 2S early Fox 40 Eagle III currently own 2 Eagle Ills must compliment quality value youve designed built Fox engines Corey Wills Perryville MO compliment having thefinest engines made Several myfriends have flying Fosfor past three orfour years wouldnt give up other engine somewhat higher prices lately still cant beat affordability reliability performance Doc Matthess Wichita KS drop note express pleasure over engine Fox 45 Excellent midrange easy start set super neat spinner set up andfinally sofe incredible power larry Maltman Winnipeg Canada k kindlyfor promptly courteouslyfilling last order appreriate excellent service seems todays hurried ways few businesses take time what just seemed naturalfor Fox Mfg Ca have active builder/flyer since 1962 Myflest Fox engine reliable durable lam also happy state additional 17 Fox engines have purchased since 1962 running reliably consistently lester Goldsmith Action Hobbies Memphis IN riting tell Fox 60 Heli Engine has cranked run flawlessly rightfrom start Enclosed pictures Schluter Scout 60 1 did test run engine before installing believe really necessary because just cranked Fox 45 Heli today new unrun except byyourfacroryj new Schluter Junior though test run too cronked ran immediately idled perfectly very smooth believe word getting around Fox best buys now because compression al ways good making starting good power output always above average tops confirmed test articles magazines Life always goad because appear cut corners importantfeatures such bushed conn rods grades material Ruts always hand tap factory service unmatched anysvhere Eugene Mathis Daphne AL Fox 4OBB out Clubfleld last Saturday kicked tires lit thefires took off leaned bit andflight number twa went whole tank really started come Flight 3 very spectacular pulling vertical stall turn Ifinally throttle off hung prop just kept going veritable hoss because Kaos 40 weighs ran Walter Pawlukanis Oakhurst NJ normally write manufacturers anyone else asfar goes matter offact cant remember wrote last However am really impressed Fox 4OBB Delux WOW what engine have mounted 40 size Ugly Stik type airplane about 2-1/2 gals offuel through irsofar Eyes popping started right up required some hi 5 peed adjustment Since until now has gotten better better Vertical performance just doesnt quit ttle response certain sure Im willing wager bet money its certainty AlMancini las Angeles CA te thank youfor incredibly fast turn around phone order Onward Upward Andy Keeley Memphis IN ht Eagle III put 6-1/2 pound airplane next day flyingfield great airplane vertical performance needed Thank great engine also like Dukes Mixture Model Airplane News Happy Flying Manufacturing Company 5305 Towson Avenue Fort Smith AR 72901 Phone 501 646-1856 April 1989 35 Freebees available time new color catalog new price sheets parts sheersfor 1988 1989 model motors wauld appreciate receiving seffaddressed envelape twa stamps however masking tape rear Drill through sides tongues #29 bit 136 tap 8-32 nylon screws Replace fit hatch Sand Y32 skin flush FR Fit forward section formed sheet glue place hatch place shave sand trim pieces shape F6 aft FS Cowls nose cowl adds needed weight attaining correct center-of-gravity aft cowl merely cosmetic lost foam method can used make fi berglass cowls Styrofoam forms made undersized allow cowl wall thick ness Use batches Hobbypoxy 2 four layers 6-oz cloth strips nose cowl aft cowl takes layer same size strips Add final layer 2oz cloth both units After epoxy has set gouge out foam use acetone remove resi due ply cowl mounts installed last epoxy strips fiberglass cloth nose cowl should have final weight 4 oz Use hex ball-driver reach hid den socket-head bolts use extended sides FS shaped balsa blocks instead glass nose cowl may need add nose weight correct centerofgravity Empennage Its important build sta bilizer light strong aft engine right trying shake apart Build main frame flat over plan protected wax paper Notch tip pieces R-in-sq hard balsa spar Add 10 rib supports hinge blocks Dont forget A6 ply trailing edge doubler Trial fit frame fuselage Posi tion A-in-sq balsa inboard ribs hug fuselage sides sanding ribs ap propriate contour procedure allows unit covered prior attachment fuselage Add remaining ribs fit four A-in vertical-grain braces will epoxied place after stabilizer has covered attached Assemble elevators /I6 dowel block sand shape 015 alumi num support formed around dowel Build upper lower fins associated rudders upper rudder has groove its lower edge accept Y32 wire torque rod Fit upper fin place over F8 F9 lower fin tail post A-in birch ply predrilled A-in bit hinge point Make lower fin including /16 ply bearing piece %2-in hole lower torque rod trailing edge fin clamped glued after hard wood block formed tail wheel wire has glued place Add soft balsa filler set aside Rudder torque rods make upper torque rod start cutting two pieces % music wire making 2 sec ond 4/2 long Make 900 bend 1 end Solder -in sec tion K&S 125-in-sq brass tubing its end 3A-in leg Allow no solder outside brass part Tinning wire first sweat ing brass wire makes nice neat job Make upper torque rod Solder /2in piece 125-in-sq brass tubing onto end 1-in leg 2%-in piece 156-in-sq brass tubing slipped over 125 tubing ered Lay upper lower torque reds flat board relative positions Assem ble lower tube upper tube telescope mating parts one-fourth inch Tackle upper wire assembly soldering iron remelting upper joints applying very light pressure both 900 arms resting flat sur face arms will now lined up parts assembled specified before remelting lineup risk fusing whole assembly making un usable Telescope two parts checking ease fit dimensions Assembling covering Finish fuse136 Model Aviation ELECTRIC SEMI-SCALE Radio Control Sport/Trainer Wing Span 67 3/4 Length 37 1/2 EIII see Local DeCirn PAUL K GUILLOW INC WAKEFIELD MA 01880 Push-Pull/Masters Continued page 35 lage assembly fitting top batch canopy area sealing front fuel tank area epoxy Fl P2 provide fueltight compartment protect electronics carried below Assemble controls sup porting necessary Add triangle stock close up compartment F13 Cut lower hatch provide retaining Attach Halco strut four 4-20 aluminum bolts plastic nuts wheel pants sawed 4 x 12-in balsa block thick Reinforce A-in birch ply Resist tempta tion carve sand wheel pants nice streamlined shape need cer tain heft order contribute drag land ing time Remember although two engines idle frontal drag area single engine After final sanding vacuuming free dust cover individual parts favor ite material Coat both firewalls epoxy inside out covering stabilizer leave bottom center section open Position stab attach CyA checking align ment carefully Pass lower torque rod through /I6 ply bearing Fit lower fin slot F12 clamp lower tail post A-in Lite Ply fuselage cross brace Square up epoxy fm leading edge inside fuselage Attach A-in ply lower tail post A-in Lite Ply cross brace using CyA Glue four vertical-grain A-in braces stabi lizer fuselage sides Close up stab center section Push lower rudder over torque rod epoxied hinge point Make sure treat center hinge point pe troleum jelly expect hinge action af ter epoxy cures Angle upper torque rod position through its ply bearing join two torque rods Fit aft hatch place bolt Assemble upper rudder its hinge point Line up two rudders epoxy upper torque rod groove bottom rudder Install elevators attach 015in aluminum support aft firewall two No 2 screws Secure tail wheel tiller loop lower rudder small rubberband bound tightly possible tail wheel off set rudder pushrod undersize minimize servo shock engines place pipe up fuel systems using pressure both Use Hig ley Heavy Hub Master Airscrew 10-6 prop up front lighter Zinger 10-6 wood pusher prop rear combina tion will give extra 3 oz up front counts Install electronics feeding anten nae back through upper lightening holes snaking out three holes left side just above stabilizer Flying single servo controls both throt tIes using Du-Bro EZ connector ca ble arrangement servo throttle linkage can independently adjusted Set front engine reliable idle high-trim position Low trim should cut engine Kill front engine set up aft engine same manner Setting up engines manner makes unlikely both can cut off precisely same time However pre sents no problem since engine should fail final approach go-around single engine readily made desired Its unnec essary synchronize engines just have both running well Its important aft fuel tank car ried high possible within tail sec tion use piece l-in-thick foam under tank Since engine pusher configu ration does have rain carburetor air tank location relation needle valve critical order avoid early starvation fuel level lowers small sheet metal scoop attached direct rain air carburetor throat Although worked ef ficiently carrying tank higher much less trouble equally effective Keep simple Note also rear tank clunk stalled forward position Having used clunk pickup both directions pushers Ive found forward installa tion satisfactory requires much less fuel line As aircraft having pusher propel lers special precautions must observed prevent debris going through Continued page 141 April 1989 137 1t I] iyu 111 E1ii RE SHOOTING DOWN HIGH BALSA PRICES WITH SUPER QUALITY Satisfaction Guaranteed Direct Only BALSA SHEETS 36 48 30 BALSA STICKS 3648 16233 332240 18243 316249 14256 132337 20337 163374931 33234458 37 1835471 45 31636282 55 14373 95 61 516395110 38355124 71 123110155 34 3165191 116455 7648 332470 9456 18 48010666 316493122 75 14411013484 38 4165225139 12 4225261 MATCHED SHEETS 42 3324100 164109 3164120 144131 116 14 116 36 116 12 332 14 332 35 332 12 18 18 18 14 18 36 18 12 316316 316 38 316 12 14 14 14 30 412 14 34 141 516516 3838 3812 3634 381 1212 1234 121 58 55 34 34 Os 10 14 10 12 16 08 11 12 18 11 17 22 16 19 21 34 40 21 27 32 42 52 36 46 56 48 67 16 18 24 16 20 30 24 26 30 44 55 28 37 46 55 70 53 62 78 66 90 BALSA HOT LINE Call 806 745 6394 10am 6pm Central Time BALSA TRIANOL ES 36 25 8830 35 45 55 BALSA PLANKS36 86 0 00 1480 1123275 1124360 22225 23325 24435 33495 34668 TAPERED SHEETS36 142 65 143 65 382 83 23120 LONE STAREPOXY 90L sI--S 95 5so598 iSoro598 38 rro598 CUSTOM CUT CONTEST BALSA Sheets Piece ed Close Tolerances AAA Grade Dried ped 100% a serious modeler want performance must try 4-6 lb balsa LIGHT 4-6 LB WOOD 1 32 3 1/203 1163 332 3 183 3 163 143 383 123 343 13 1 164 3 324 184 3164 144 384 124 36 53 53 53 63 77 89 104 122 158 242 335 83 100 115 133 158 236 322 TRAILING EDGE 36 14132 51611439 3811246 12270 INSTANTOLUE 1 o TSck 298 10 750 298 20 T5ck 550 20 150 550 BASSWOOD 316316 31614 31638 31612 31634 1414 1438 1434 3838 3/812 3634 12 1 2 1234 BUNDLE DEALS 28116336695 201164361035 20332 336865 15332 436955 151/8336738 101/8436895 15318336920 10316436835 1014336655 101/4436830 103/8336870 53/84 36655 51/2336540 5124361580 10-3324 48885 518448500 5316 4 48600 514448645 48*NEW* 26Hundreds 30 38 46 cessories 60 ishing 42 materials 80 60 #10 SASE 70 atest 90 catalog 100SPRUCE STICKS 3648 18 181725 18 142026 18 3/822 32 316316 28 38 14 3/84055 14 124585 3/8 3/84969 38 126577 12 I/O6688 12347597 SPRUCE TRIANGLES 38 38 12 1 2 34 34 1846 18412 146 HARD MAPLE 1 4 36 3838 38 12 3834 1 2 IRCH DOWELS 18 316 14 516 38 18 40 45 50 58 68 36 09 11 14 25 32 3PiVBIRCH48 16412620 13212445 11612455 1812485 SPLVBIRCH 48 33212588 1/812 625 36316 12625 4714 12828 8438 12725 8112 12900 LITE PLY 48GROOVED LGMOUNTS lllachea 15538341840 3153834/532140 2501234916/45 495 V. Push-Pull/Masters Continued page 137 prop author owned full-scale Lake Amphibian pusher years found protecting propeller loose nuts bolts fishing rods always major concern twin engine push-pull arrangement especially vulner able front prop can kick up stones starter cables wiping cloths etc promptly present rear prop digestion Flying twin pusher also requires special watchfulness flight Push-Pull 240 near-fiasco Immediately after takeoff carburetor aft engine came loose moved pusher prop promptly seif-destructed en gine full bore extremely unbalanced tore itself firewallbefore fuel starvation saved day whole scenario lasted about three four seconds pilot Ray Doan brought ship back single engine thorough preflight check would have spared pusher prop main thing remember get Push-Pull smoothly aloft advance throttles steadily during takeoff Ground control will positive no torque cor rection required Clinibout will solid watch slice through ether sound twin 40s something else Radio Technique/Myers Continued page 37 RC34 through RC37 vice versa 2 next condition change comes out mathematics frequencies coo Image interfer ence will return few SC455s Some folks will remember 7296 Y/W used image 7208 Bn/W Well SC455s RCll-14 RC57-60 can af fected Tx within band have local oscillator wrong side assume manufacturers simply wont sell SC455s channels Besides image coincides exactly Common Car rier Tx frequencies RC Tx helps Rx low LO have possibility imaging TV4 RC44 problem know love So see nothing simple cure above simple Use dual conversion Rx entry-level RC system almost always uses SC455 manufacturers will have narrow-band pay attention proper LO signments keep off RCll 12 13 14 34 35 36 37 57 58 59 60 Jim didnt mention channel doubt above manufacturers just arent selling Indirect Interference condition comes out numbers called Second Order Intermodulation Product Interfer ence 21M generated ANY PAIR Tx operating 23 RC channel numbers apart difference two frequencies modu lated 460 kHz signal often goes right through 5C455 detected interference Think 21M generated JUST ONE PAIR Tx might hit OWBAM SC45Ss SO channels simultaneously including own Rx depending signal strength Rx tenna RECEIVER CHARACTERIS TICS Nobody uses odd-numbered RC chan nels RCll 13 15 today dont see 21M Can predict what will happen give 25 odd-numbered channels another service Now remember discussing RE CEIVER problems assumption everyone already using Gold-stickered narrowband transmitters Practically Tx built since 1987 good enough warrant sticker easiest way avoid problems listed above use dual-conversion receiver dont have block out ANY channels Jim manufacturer offers best dual-conversion receivers market relatively cheap recommend letter appropriate person named end last months column narrow-band 5C455 can work cause interferences discussed above z off 455 kHz intermediate frequency IF dead like 31M Narrow-band SC455s exist example Bob Aberle recently tested Polks Pow ermax Merlin system receiver 5C455 RC46 its LO low side An IF bandwidth 6 dB 2 kllz claimed nothing quoted 85 kHz Merlin performance meets AMA guide lines except ins LO wrong side does use dual conversion DC outper formed 1991 DC system have tested ex cept its PCM computer slow April 1989 141 LONE STAR MODELS1412 1623 S7th St Lubbock TX 79412 cant 46 Handling charge pay UPS Add $250 COD $300 extra PP APO FPO StateS accept Vs4 Master Card personal checks COO 6% 368/n TenaS US crrency Mnmom Wood Order 51000
Edition: Model Aviation - 1989/04
Page Numbers: 24, 25, 26, 27, 28, 29, 30, 31, 32, 34, 35, 136, 137, 141
Edition: Model Aviation - 1989/04
Page Numbers: 24, 25, 26, 27, 28, 29, 30, 31, 32, 34, 35, 136, 137, 141
NO OCR TEXT NO OCR TEXT Left aft hatch hides 6-oz fuel tank tar rear engine natchlfin unit rejainca wuin trappea o-a aovw-neea oumi ana iwo O-J nylon screws Right Removing front hatch reveals plywood keeper holding two wing dowels place Under Sig canopy Williams Bros pilot ready go wing bolt covers made aluminum cigar wrappers have painted match Left simple onset tail wheel tiller lessens servo shock during ground operations Right Fiberglass cowls nice addition model difficult make 4-oz weight nose cowl helps balance aft cowl may omitted desired Fuselage Use piece A-in Lite Ply 12 wide 48 long Determine whether want separate fiberglass nose cowl built-up front engine compartment opt built-up style add 4 part labeled PS front FW plan Placing Lite Ply under fuselage side view locate end points straight lines pin pressed ply Con nect points using ball-point pen Hav ing basic lines straight makes easy work drawing sides curved sec tion wing saddle can traced few pieces carbon paper slipped between plan plywood Cut out PS sand down lines shown plan Trace second side first cutting sanding outline Clamp two sides togetheror socket-head bolts attachIng cowls can reached hex ball-driver hold together small pieces masking tapewhile block sand identical size errors tracing inevi table Make sure edges square 6 x 12-in piece /16 birch ply used nose doublers F4 Use FS template Make cutout section gear mount P3 Apply very thin coat 30-minute epoxy doubler P4 position FS making sure allow firewall FW Use weights clamps until ep oxy sets Make right left fuselage side asme Haico B106-8 strut Du-Bro axle K&S 062 aluminum clip hold rugged plywood-reinforced wheel pants place sembling its respective birch nose doubler Make two aft doublers Fl 1 attach thin layer epoxy Allow correct spacing aft fire wall FR two small doublers F6 can also attached using white glue suggested sides resanded en sure upper lower edges true identical sides placed inside surface faces up carefully draw locations Fl F2 F5 F6 F7 Make firewall FW laminating A-in birch ply Cut FR X6-in birch ply Draw horizontal vertical thrust lines both sides firewall will using engines different makes pick heaviest tractor front unit engine including muf 26 Model Aviation DESIGNED BY AL MASTERS IG WC 813 CRrJOPY FI0ERGLR ccWL--pwORKW OP&BOJTOM 3A6LA GOLD8ER%RLBR_ \\ /axBf4L N / 2 _____ NGL016 pIY IV 13~gW 3/ 15 pUI y8%Y I3R$A Qj 4EET 1~ 4 C ~RVY 2 Weigh wing spars determine two heaviest Place 01 heavy spars right panel other left fler attached its mount position firewall canting counterclockwise see front view Hold thrust line indicated allow muffler clearance proper carburetor location respect fuel tank Mark drill firewall stall four 6-32 blind nuts three tend use fiberglass cowl back side aft engine side mounted exhaust down standard mount such Dave Brown 4045 can used light weight variety shown plans engine should placed close FR possible still allowing clearance Tatone EM 4Oss manifold Lite Ply spac ers can used between FR mount mount arms longer neces NOTE FRONT ENUINE INSTALLATION-TUT CHORE FOR CORRECT LOCATiON OF EARNURETOR IN RELATION TO FUEL TANR ATTACM MOUNT TO FERWALL WETTI FOUR 14-32 T-MJTS N BOLTS LOWER MATCR CR LITE PLYF13 1-1 II lOOT UTE PLYII MUFPLER LUCATIONfl I504 RALSA TRISTUCO I/S PLY 4.BOTCH FUR MAPLE MOCR IIIII I/U RALSA TRI-OSUCI I/O PLTiiAjTj I ICONSTRUCTION 010 iT - - NOTE SERVO SHOWN FROMLM PLY SERVO TRAY ELEVATOR AILERONS IRUODEU I/O PLY WOOD I/H PLT IHEMUVAMLEI 6 ~ITEj I/lU PLYPUPLY WITH F-IS I/O CITE PLYHI/lU PLY14-02 TNUT 0101EV HEAVY---2~ ATCH -- OUR IOUZI -UIIBUZI AU TWO-CYCLEFAIrSUORO S-b TUSOIOU MALSA--H \iiiEAGNEII-V TUCKI IF BALANCE IFUAMI SERVO04 L PLY WITHOUT I 1CUSYRUL MASTER AIRSCSEYR 0-14RATT LYSUPPORT GOLORERO 2 SONNER\V- 0-SO ECE1YLR 11400 EI51 TROT--I IFLUM001CR VUNISE HEAVY WALL FIREROLASS COWLP13 IA PRAX 4 00 COMPLEVEUTE PLYHATCH HALCO BlUR-UI/H -005/4 ALUM ROLl 002 005 ALUMLASOINO SEAM H OTLUS SLYTIVI LANOINO OEAR CLIPLIURTEN RAND TU FIT/ ER PLYWOOD- I/O PLY lBALSAZi4IA OOR LITE ATTOEB WITH 004-40 NUTO BOLT TO.. 145O SERER/NAT EAO _FUSELAGI VI E 000140 040 REMOVE NOT FROM RALCO UEAR TAP FOR 001400 VOLE -GZYS 010 500 04 sary should cropped off save weight Use three 4-40 blind nuts bolts install mount Remove mounts before continuing fuselage con struction Cut remaining fuselage components materials specified Note Fl A-in birch ply includes switch cut out F12 F13 shown actual length plan can traced piece Left Fuselage parts Lite Ply sides bottom conjunction birch ply balsa keep weight distribution under control No tice two pre-formed balsa skin pieces fuselage side dou blers have already glued place Above Completed basic fuselage straight lines design signify easy layout 28 Model Aviation wing ribs Irst cut out witn construc tion tabs left provide easy method building necessary wing washout Full-Size Plans Page 188 F-I2oR LITE PLYAFT ENGINE MOUNT 1/H Lire PLY SPACER ID OH 4 REOHIREBI 141 HOLES TO WATCH L/2BALSAENGINE CASE THFSTOCHI/TDA WALSH -I 052 KS S--ATTACH TO F-fl WITH LS KS/B BALSAALABINOM131 4-40 T-NUTS S BOLTS BLOCK3/8 SOFT BALSA TAP FOR I/O-ZOkS/H 010 FIHEHOLASS COWLSPINNER -I -flE-KAF-Il III iCANOPT- COCKPIT AREA IAIII III I I _ -II __IIIII I I/ZBALSAI OW PL F-Nil I11 ...I II THFSTOCK HATCH TONGUE - I F-ri II 711 UiI i -----ZINOES 10 K Fl/A H-SO RH HALTEPOXYOx 3/4 BALSAPOSHEK PHOP TRAPPED E TOP VIEW EPOOTPSAS SYWAW'\I/B LITE PLY 1/1K PLY--.....WAKE I/H TM-STOCK I 3HBALSA0TRIBTO L~--IF-SROBART DOW F-SL_________IT-NOT K-D2 IEPOOTIOs HEMOVE FOR FOEL illiiiTANK ACCESS IIIII pF-6Ul II 04A IRE ORR IN PkASYIC ISO 121 SODA BALSA F-R 1540KF-fl T I-P/KS/IS PLYWOND Fl-Ia 3 I/2T ____ 2-I/H L 1/2 3-I/O 3/sO WOSIC WISE -1/1K PLYWOOR - R 156 50 040K lOSSO 1OYEW MWSOWER IAFTER UFE OP WITH 15K SQ BRASSASH TO SHAPE TUBENOTE RUBBERS AWE 0*EL A2EAEJaLI I42AALKZ2RN 125 50 BRASS _____I/U BALSA SHEETTUBE SHER MW HODDEK ISOFTISOLDEK - 'I/IHPLTWOOO I/H LITE PLY SPOCEKS 3/32 BALSA-NBLENO 3/32 I-D4 AlASHEET7AT WATER 2 TI -.LL/TUPTYHO FOR B52 NYLONFS SCREW 121 STABILIZEHi~ -1/1K PLYWOHO LS LITE PLY NOTE AFT EWAIRE COWL IS USHT WEIGUT- LAYER H DO LOATH PLUS LAYER 2 02 OLSON AFT EWAINE 500k ALL BATEHIAL MEDIUM BALSA ARLESS SPECIFIED OTHER Sb WC HID CANOPY RE-WORKEOI niN - FRAY F-7"HATCH BALSAII F-00F-B STOCK vzziU ALL LYBx 3/4I --. SOFT BALSA FILL F-HTIWVOKD/B.-24T1 ALSAI________ __________________-N I/ZBALSA F-Il 01 "CLuRK FOG THI-STOCK .----Io --STABILIZ VL SOALSOWALSA I/BBRLSA R-BLOCK SHEET I/O BALSA THI-STOCKF-6ALS PLC T AID- H HEOKIHEB~----4-40 BOLT-REROOC HEAD OR 1/H LITE PLY PLY N ESOAKS/AF-90TH 00 BALSA BALSABASIC WIRE IEf7iLSOFT BALSA PLYCLUMP N SLOE FILL --1SPECIFICAT IONS - SECT A SAWS WING SPUN HO COT OOT AFTER/550 AREA SQ 14 3/52 BALSA SHEETZNZATTASH AFT-PLYWOWOWEISHY IFUELEDI 9 LSC HDZ ASSES BLY IW PLYMAKE 2WISH LSAOINU OZ AIRFOIL.IH 7 SERI-SYM 34K BALSA SHEET L/$3JWITB WASHOUT POWER TWO 00 ENOIRED F-IaF- IF-S-HATCH2-CYCLE TeNUE F-H BLITE PLY 121 MODEL AVIATION PUSH-PULL 240 TWIN ENGINE R/C MODEL DESIGNED BY AL MASTERS TRACING BY JOE DEMARCO sanded correct outline cut apart finished components should include drawn centerlines aid lineup during sembly Cut lightening holes F12 af ter separating F13 Glue six con struction aids F12 Make preformed 3A2 balsa skin aft fuselage section will need some household ammonia cardboard tube approximately three-inch diameter core tube Christmas wrapping paper works fine Left The wing panel begins take shape has turned over show construction tabs Above bare bones horizontal tall show lightweight structure Because engine vi bration1 must rugged conventional model April 1989 29 upper rudder fitted square brass tube assembles lower rud der tall wheel hatch offers easy ac cess fuel tank supplying aft engine Wheel pants cut 1-in balsa block reinforced 1/-in birch ply carve nice streamline shape ex tra drag helps slow model down during landing model twin has frontal drag single-engine model finished nose cowl foam plug roughed-out aft cowl plug aft cowl can omitted front cowl adds 4 oz much needed nose weight lightweight aft engine mount used help get right CG Select two 7-in lengths /32 sheet 6-in-wide stock Trim balsa 5in width soak ammonia STABILIZERS/B SO BALSA LEADING LEFT STABILIZER STARRI PA CITE PLY BEFORE I/B lI/A BALSA~OsA SEE SHEET RIBS ORE OBOESTRISTOCK VBx I/A BALSA RIB SUPPORT I2OBALS S/IHZ I/OFiLL BALSAJ 7BABORT3OBI/OSA HOBOij BALSA SPAR CSCRAP BALSA 01 I/Bx I/O BIB SUPTS015 ALA /1/ AOR PETLOWER SURFASE INSET / 3/0 SOFT BALSA SHEET S/TOZZRALSASHLfl IBS-SAEETI NOT SBOSAN OR LEFT / ROSA SARIS1/5 50 OARS 3/32 SCRAPTA CONTOURBALSA BALSA RIBSvO BALSA SHEET BATE TRIAL FIT STAR TO VFOSELAAE BEFORE ATTACRIRS VA SO BALSA I FILLELEV-STAB SECTI LVI I/A BALSA I COVERING STAB IIAVA SCREAj~ PUT 7ORILL FOR ipL5/32 B BI I/A BALSA LEASISS OIS ALUMEASEy 0/01122n-p-iiBALSA /_____UWING ____ I_ ~1I _____ PLAN TOP VIEW _______I BALSASBIItZ BALSA 5/52 BALSAI I/B xl BALSA LE3/Az OBEET RIRIO V4x S/B I/B I/O BALSABALSA SOB LEABISA EPSEI/H BALSA2 RISER 5PM SHEETWITHOUT CAP S/SO RALSAVA 120BALSA WISE SHEETINGSPARS 5/52 BALSA least five minutes Blot wood pa per towel wrap around tube using masking tape hold place Set balsa skin aside allow air dry thor oughly Save ammonia another proj ect Begin assembling fuselage over top view plan Support sides up right glue firewall place using F5 spacer Use white glue since will allow time lining everything up Place weight such ordinary brick top front edges fuselage sides clamp FW place pull aft fuselage section together time lower fuselage line forward F5 straight weight will keep setup square work surface until glue sets Attach FR using white glue 10-minute epoxy aid clamp Hold sides together attach F6 cyanoac rylate CyA Add two 14 x %-in crosspieces fit Fl 1 Check position WINO L DIHEDRAL DETAIL NOT SCALE F5 tack CyA Make relief notches Fl clear blind nuts back side FW Force Fl position will aid correcting misalignment front firewall F5 attach CyA Install /6 x A-in hardwood servo rails make servo tray A-in ply fit After gluing F3 place set fuselage asideyoull com pleting laterand proceed wing Wing Trace cut set ribs using pattern make second set Fin ish sand ribs pairs draw chord lines shown both sides rib Cut dihedral braces draw two centerlines indicated both sides leading edge brace Cover wing plan wax paper plastic film before pro ceeding Cut four straight x A-in balsa spars length point weigh four pieces distribute spars avoid using LS 1122 SUB LEAGIRS EDGE 30 Model Aviation Due heavy side loads engine weight necessary use birch ply hardwood lower tail post system Note soldered upper lower torque rods Full-Size Plans Available Page 188 I/B BALSA REMOVE FOR SERVOSMEET IFI 2 Q1 — U AILERON SERVO-L SOFO RULVA- 01 LI lb 0I RALSA OREET IOFT ALSA SO EDGE S/IA DIA DOWELS WINO SOLO SOWN I] NOTE BIBS 2 TRRU 12 ABE 5/32 BALSA SHEET 3 [I 45678910II12 111 II r I OR BALSA SHEET WISH YIP FRAMES I/R PLVWDODV UPPERI/R PLYWOOD_______ I/R LITE PLO1QWiR t __ LEADING EDGE VA PLYWOOD S/DO RALSA SHEET TVP H BOVVOMjSERVO DOONYDIHEDRABRACESWING TIP DETAIL HAL NA S/HI/O /0 BALSA1II______ 71 FILLHOII WINO BOLT PLY4 ACCESS I/O BALSA SUBEE -PUSHPULL 240 3/BR I/O OIL STOCHL --TWIN ENGINE R/C MODEL RI LIGHTENINS ROLES ISV BTA FUSELAGEI/IS BALSA SHEETDESIGNED BY AL MASTERS SIDEBATH SIDESWORK SURFACE I254NTRACING BY OE DEMARCO IIIII ALL RIGHTS RESERVED FILL ISO MUSIC IKE EPOOVI / I/B BRASS TUBE EPOXY TO OK aileron servo carried well forward wing Z-bends A-ln music wire pushrods used connect servo Arm II I-V117j4I TRI-STOCEILIli-TiI #~p Iftv 11-----S I/B LIVEF4[~SRWVAII DLV April 1989 31 receiver battery pack three servos nestled lower nose section below 12oz front fuel tank dual take-offs 5-26 servo controls throttles both engines Left Both K&B 40 05 4OFP have used tor tne aft engine witn equal success Lite Ply spacers firewall provide clearance Tatone manifold Right fuel tank nose compartment sealed keep fuel leaking electronics below two heaviest same wing panel postal scale coding used Glue lower ply dihedral brace spar halves position spar over plan securing pins weights Position ribs 1 through 12 spar making sure construction tabs resting work surface x %-in trailing edge x /2-in leading edge pinned place ribs aid lineup space between ribs 1 2 pro vides leading edge brace will slipped later After making sure ribs perpen dicular work surface CyA ribs spar leading edge trailing edge Fit upper spar glue place Block sand upper surface trailing edge slightly follow rib contours Select four sheets %2 balsa 2-in stock upper lower trailing edge skins Check weights using two heaviest opposite panels Hold metal yardstick edgewise across ribs board sheet edge certain sheet line will straight attached ribs high rib can carefully sanded down dont worry about low rib point Turn wing over Using piece wood such ruler press wing down ward contact %2 sheet bond ribs CyA Work about three ribs time starting rib 1 skipping low ribs Maintaining straight sheet line out waves important gluing rib chip A-in triangle stock can used support skin low rib cap strips added later will hide multi tude construction errors Build wing tip attach rib 12 Center tip rib chord line leading edge 4 x %-in trailing edge balsa filler trailing edge tip will allow block sanding fit con tours %2 sheet aileron Attach tip webs will final sanded after rib caps place Add four hinge supports vertical-grain %2 spar webs between ribs 3 12 Fit rib iF place panel inch off work surface rib 12 set iF perpendicular work surface glue trailing edge spar notch tack gluing leading edge Note iF shown actual length plan reaches leading edge strip Allow space spar notches fit dihedral brace mating spars later Set panel aside construct oppo site panel similar manner completed second panel work surface fit two panels together El evate first panel 2 per draw ing push lower spars together until butt Slightly bevel spar end ob tain good fit upper dihedral brace slipped alongside upper spars clamped using least two clamps side wing centerline Make sure %-in dihedral brace fits flush slightly below spars sanding down later will difficult Add leading edge ply brace clamping same manner Rib iF will have razor sawed shorter Make sure horizontal centerline leading edge di hedral brace located correctly ribs 1 2 both panels bottom edge of servo mount sec Continued page 34 32 Model Aviation finished model resting authors balancing rack Location correct cxi shoula always determined model before making first trip out flying field idea RC Push-Pull 240 came WW Ii Dornier-335 Reported worlds fastest propeller-driven aircraft its time war ended before could made operational youve ever fuel tank split leak fuel fuselage know important install tank can trust Du-Bro Products manufactures complete line rugged polypropylene tanks 10 convenient sizes 2oz 24 oz guaranteed life against splitting leaking money back tank comes complete soft brass tubing hardware Protruding front lip prevents fuel lines being crimped hard landings Single twin vent design gas conversion stopper available use tank gasoline Cat No 400 Visit local Hobby Shop fuel hook up accessories can Cap Fittings In-Line Fuel Filter 0 Fuel Tubing Kwik Fill Fuel Value Gas Gb Fuel Tank Filter KwkF Fue Pump tion should parallel work sur face wing level upper spar leading edge clamped rear section wing panels butted trailing edge make final check spars run straight tip tip Hit ar eas CyA Carefully turn wing over clamp lower dihedral brace two clamps CyA Add four 3A-in triangle braces ribs 1 2 Complete center section shear webbing cut off con struction tabs Add balsa filler blocks trailing edge bays between ribs 1 iF Carve notch bottom iF accept W2 Install latter gluing flush bottom rib 1 Remove section iF accommodate aileron servo location Wl can shifted neces sary allow space aileron servo stall Wi add A-in triangles support W2 upper lower leading edge sheets attached /16 overhang leadmg edges Wetting outside surface sheets will make forming easier sheet edges will block sanded until leading edge provide flat gluing surface x 1-in leading edge cap Fasten -in -thick scrap spacer along leading edge masking tape Place wing fuselage check saddle area fit Remove wing epoxy hardwood hold-down blocks place temporary x -in cross brace glued near blocks fuselage side support epoxy has cured align wing fuselage hold place masking tape Drill through W2 hardwood blocks Y6 bit held perpen dicular W2 Remove wing re drill W2 A-in bit Tap blocks A-20 wing bolts Bolt wing place drill two s through F5 leading edge Wi Trial fit two /, dowels shown plan Use soft balsa foam filler around the wing bolt holes sanding down center section top sheeting Remove dowls complete wing sheeting rib caps leading edge cap Drill through leading edge cap /16 bit two dowels epoxied after wing has covered Ailerons Cut two aileron cores 3/ x 1-in aileron stock After making lightening holes cover ailerons /l6 sheet balsa Drill four holes hinge pins 1-in bit drill %2 hole torque rod Transfer hinge locations wing drill Trial fit ailerons hinge pins /2 torque rod assemblies alignment correct epoxy brass tubes onto wing trailing edge Remove ailerons final sanding covering Fuselage-wing assembly rmal fuse lage construction Razor saw two slots 34 Model Aviation top F5 sand accept wing dowels make /6 drilled holes oversized dowels inserted bolt wing place Lay small piece wood across top dowels trace its lower edge line location F5 Move down /16 below line just made fit piece A-in ply between dowel holes epoxy F5 Epoxy 3A-in triangle brace under ply Drill /16 hole center through ply tap A-20 bolt Treat hole CyA A-in ply wing hold-down has A-in drilled hole see drawing detail Cut two fuselage trim pieces / x % x 15 long medium-hard balsa Glue top FS extend yond FR about 4 dont glue beyond F7 Make /16 notch trim piece allow pulled together slightly behind FR secured rub berband tape Slip piece wax paper between FR FlO clamp FlO FR Glue FlO trim pieces being careful bond latter FS Cut piece x M-in balsa width F7A Add /16 ply top drill 140 hole #27 bit shown Glue x s-in piece top trim piec es F7 Glue F7A top crosspiece after fitting over /16 ply stall 1 A-in-long 6-32 socket-head bolt washer through 140 hole Use small piece tape keep bolt fall ing out Trim section preformed %2 skin fit between F7 FR overlapping both slight ly Sand bottom edges theyre alignment top trim pieces mate F7A FlO CyA skin trim pieces Aft hatch Razor saw remove aft ex tensions trim pieces cut through F7 Remove hatch section com plete application CyA F7A FlO piece plastic soda straw epoxied place will keep 6-32 bolt trapped Sand %2 skin flush F7A Install F8 F9 through slots cut formed skin Small pieces triangle stock add final rigidity unit Complete hatch front hold-down placing piece /16 ply 6-32 blind nut under two x 3A-in fuselage crosspieces Line up hatch snug up 632 bolt Use Du-Bro ball wrench inserted through small hole skin CyA ply place remove hatch epoxy ply cross members two /16 ply aft hold-down tongues installed follows Shave off excess material inside hatch trim piec es 6-32 bolt masking tape rear holding hatch place work through opening fuselage bottom Position ply tongues tack CyA F9 %2 sheet bond FS Remove hatch ep oxy tongues Again bolt hatch secure Continued page 136 EffectiveJanuary 1989 Fox motors except Combat supplied muffien some time have using soft sell approach columns customers direct some excerpts letters have received Eric larson Pine Grove CA Fox Mfq Yesterday bought Fox 4OBB Delux thefirst Fox engine have owned some apprehension bought anything other OS engine have burned before buying off brand engines Today am convened Fox 40 40SF similar both start idle magnfkenrly cant tell dfference power thats similarities end Fox 40 vibrates less easier adjust lighter comes great spinner costs hoff much American made hove now made sure everyone myflying club knovs what great buy Fox engines THANK YOU FOR QUALITY PRODUCT Eric Branham Paris IL r purchasing 40 Delux year lam impressed performs exceptional lot better OS Are planning replace Eagle III update 60 size will assured will first line purchase Jon Armitage Indiana PA ed send letter praise about motors motors used flew C/L FE started RC about year ago decided try Super Tiger 25 0S4 Stroke 40 good came bock Fox power quality handling allot decent price engines popular field Will Sgarlat Cape Cod MA note tbonksfor youve donefor wonde4izl hobby yourflne engines Dukes Mixture column temfic service offer us accidentally smash up Fox engines beyond what theyd care tackle repair Westley Keller Gouster OH have meaning drop linefor some time 40 motor trouble replaced put icing cake will never run anything planes unless says Fox side performance service says subject Decals present time am running 8 Fox engines am requesting Decals accordingly Alse lam lookingforsvard coming Eagle 4 Keep going best engines world Barry Doughty Absecon NJ placed old OS Max 60 Clipped Wing Cub Top Elite new Fox SOBA WOW what engine no vibration started right out box no adjustments Idled good accelerarionfrom idle full bock reenfic Weight bigfactor purchasing SOBBRC lighter OS SuperTigre Come etc Also must add replacement parts economical foreign imports Coming landing motor idled down beautifully settled infor great landing Again engine something else loads power very easy onfuelfor SO size engine John Holder Ob Seeverson AL ne obviously drfective else would have pulled wings off Aerostor 40 Seriously very pleased myfirse Fox engine Vaughn Kempf Modern Hobbies Miles City MI wanted take afew minutes send afew wards praise way talked three customers buying Fox 4OBB Delux motors quite impressed motors have couple observations pass along First havefound performancefigures seem little conservative modest measuring 14000 plus Master Airscrew 10 x 6 props using Royol Pro Tachfor readings Idle lower other 40 Ive ever ron realiable during spins soaps inverted idling Kenneth Wilson Schenectady NY know lam loyal satisfied Fox engine user over years Ive owned U/C 36 Fox R/C engines such Fox 2S early Fox 40 Eagle III currently own 2 Eagle Ills must compliment quality value youve designed built Fox engines Corey Wills Perryville MO compliment having thefinest engines made Several myfriends have flying Fosfor past three orfour years wouldnt give up other engine somewhat higher prices lately still cant beat affordability reliability performance Doc Matthess Wichita KS drop note express pleasure over engine Fox 45 Excellent midrange easy start set super neat spinner set up andfinally sofe incredible power larry Maltman Winnipeg Canada k kindlyfor promptly courteouslyfilling last order appreriate excellent service seems todays hurried ways few businesses take time what just seemed naturalfor Fox Mfg Ca have active builder/flyer since 1962 Myflest Fox engine reliable durable lam also happy state additional 17 Fox engines have purchased since 1962 running reliably consistently lester Goldsmith Action Hobbies Memphis IN riting tell Fox 60 Heli Engine has cranked run flawlessly rightfrom start Enclosed pictures Schluter Scout 60 1 did test run engine before installing believe really necessary because just cranked Fox 45 Heli today new unrun except byyourfacroryj new Schluter Junior though test run too cronked ran immediately idled perfectly very smooth believe word getting around Fox best buys now because compression al ways good making starting good power output always above average tops confirmed test articles magazines Life always goad because appear cut corners importantfeatures such bushed conn rods grades material Ruts always hand tap factory service unmatched anysvhere Eugene Mathis Daphne AL Fox 4OBB out Clubfleld last Saturday kicked tires lit thefires took off leaned bit andflight number twa went whole tank really started come Flight 3 very spectacular pulling vertical stall turn Ifinally throttle off hung prop just kept going veritable hoss because Kaos 40 weighs ran Walter Pawlukanis Oakhurst NJ normally write manufacturers anyone else asfar goes matter offact cant remember wrote last However am really impressed Fox 4OBB Delux WOW what engine have mounted 40 size Ugly Stik type airplane about 2-1/2 gals offuel through irsofar Eyes popping started right up required some hi 5 peed adjustment Since until now has gotten better better Vertical performance just doesnt quit ttle response certain sure Im willing wager bet money its certainty AlMancini las Angeles CA te thank youfor incredibly fast turn around phone order Onward Upward Andy Keeley Memphis IN ht Eagle III put 6-1/2 pound airplane next day flyingfield great airplane vertical performance needed Thank great engine also like Dukes Mixture Model Airplane News Happy Flying Manufacturing Company 5305 Towson Avenue Fort Smith AR 72901 Phone 501 646-1856 April 1989 35 Freebees available time new color catalog new price sheets parts sheersfor 1988 1989 model motors wauld appreciate receiving seffaddressed envelape twa stamps however masking tape rear Drill through sides tongues #29 bit 136 tap 8-32 nylon screws Replace fit hatch Sand Y32 skin flush FR Fit forward section formed sheet glue place hatch place shave sand trim pieces shape F6 aft FS Cowls nose cowl adds needed weight attaining correct center-of-gravity aft cowl merely cosmetic lost foam method can used make fi berglass cowls Styrofoam forms made undersized allow cowl wall thick ness Use batches Hobbypoxy 2 four layers 6-oz cloth strips nose cowl aft cowl takes layer same size strips Add final layer 2oz cloth both units After epoxy has set gouge out foam use acetone remove resi due ply cowl mounts installed last epoxy strips fiberglass cloth nose cowl should have final weight 4 oz Use hex ball-driver reach hid den socket-head bolts use extended sides FS shaped balsa blocks instead glass nose cowl may need add nose weight correct centerofgravity Empennage Its important build sta bilizer light strong aft engine right trying shake apart Build main frame flat over plan protected wax paper Notch tip pieces R-in-sq hard balsa spar Add 10 rib supports hinge blocks Dont forget A6 ply trailing edge doubler Trial fit frame fuselage Posi tion A-in-sq balsa inboard ribs hug fuselage sides sanding ribs ap propriate contour procedure allows unit covered prior attachment fuselage Add remaining ribs fit four A-in vertical-grain braces will epoxied place after stabilizer has covered attached Assemble elevators /I6 dowel block sand shape 015 alumi num support formed around dowel Build upper lower fins associated rudders upper rudder has groove its lower edge accept Y32 wire torque rod Fit upper fin place over F8 F9 lower fin tail post A-in birch ply predrilled A-in bit hinge point Make lower fin including /16 ply bearing piece %2-in hole lower torque rod trailing edge fin clamped glued after hard wood block formed tail wheel wire has glued place Add soft balsa filler set aside Rudder torque rods make upper torque rod start cutting two pieces % music wire making 2 sec ond 4/2 long Make 900 bend 1 end Solder -in sec tion K&S 125-in-sq brass tubing its end 3A-in leg Allow no solder outside brass part Tinning wire first sweat ing brass wire makes nice neat job Make upper torque rod Solder /2in piece 125-in-sq brass tubing onto end 1-in leg 2%-in piece 156-in-sq brass tubing slipped over 125 tubing ered Lay upper lower torque reds flat board relative positions Assem ble lower tube upper tube telescope mating parts one-fourth inch Tackle upper wire assembly soldering iron remelting upper joints applying very light pressure both 900 arms resting flat sur face arms will now lined up parts assembled specified before remelting lineup risk fusing whole assembly making un usable Telescope two parts checking ease fit dimensions Assembling covering Finish fuse136 Model Aviation ELECTRIC SEMI-SCALE Radio Control Sport/Trainer Wing Span 67 3/4 Length 37 1/2 EIII see Local DeCirn PAUL K GUILLOW INC WAKEFIELD MA 01880 Push-Pull/Masters Continued page 35 lage assembly fitting top batch canopy area sealing front fuel tank area epoxy Fl P2 provide fueltight compartment protect electronics carried below Assemble controls sup porting necessary Add triangle stock close up compartment F13 Cut lower hatch provide retaining Attach Halco strut four 4-20 aluminum bolts plastic nuts wheel pants sawed 4 x 12-in balsa block thick Reinforce A-in birch ply Resist tempta tion carve sand wheel pants nice streamlined shape need cer tain heft order contribute drag land ing time Remember although two engines idle frontal drag area single engine After final sanding vacuuming free dust cover individual parts favor ite material Coat both firewalls epoxy inside out covering stabilizer leave bottom center section open Position stab attach CyA checking align ment carefully Pass lower torque rod through /I6 ply bearing Fit lower fin slot F12 clamp lower tail post A-in Lite Ply fuselage cross brace Square up epoxy fm leading edge inside fuselage Attach A-in ply lower tail post A-in Lite Ply cross brace using CyA Glue four vertical-grain A-in braces stabi lizer fuselage sides Close up stab center section Push lower rudder over torque rod epoxied hinge point Make sure treat center hinge point pe troleum jelly expect hinge action af ter epoxy cures Angle upper torque rod position through its ply bearing join two torque rods Fit aft hatch place bolt Assemble upper rudder its hinge point Line up two rudders epoxy upper torque rod groove bottom rudder Install elevators attach 015in aluminum support aft firewall two No 2 screws Secure tail wheel tiller loop lower rudder small rubberband bound tightly possible tail wheel off set rudder pushrod undersize minimize servo shock engines place pipe up fuel systems using pressure both Use Hig ley Heavy Hub Master Airscrew 10-6 prop up front lighter Zinger 10-6 wood pusher prop rear combina tion will give extra 3 oz up front counts Install electronics feeding anten nae back through upper lightening holes snaking out three holes left side just above stabilizer Flying single servo controls both throt tIes using Du-Bro EZ connector ca ble arrangement servo throttle linkage can independently adjusted Set front engine reliable idle high-trim position Low trim should cut engine Kill front engine set up aft engine same manner Setting up engines manner makes unlikely both can cut off precisely same time However pre sents no problem since engine should fail final approach go-around single engine readily made desired Its unnec essary synchronize engines just have both running well Its important aft fuel tank car ried high possible within tail sec tion use piece l-in-thick foam under tank Since engine pusher configu ration does have rain carburetor air tank location relation needle valve critical order avoid early starvation fuel level lowers small sheet metal scoop attached direct rain air carburetor throat Although worked ef ficiently carrying tank higher much less trouble equally effective Keep simple Note also rear tank clunk stalled forward position Having used clunk pickup both directions pushers Ive found forward installa tion satisfactory requires much less fuel line As aircraft having pusher propel lers special precautions must observed prevent debris going through Continued page 141 April 1989 137 1t I] iyu 111 E1ii RE SHOOTING DOWN HIGH BALSA PRICES WITH SUPER QUALITY Satisfaction Guaranteed Direct Only BALSA SHEETS 36 48 30 BALSA STICKS 3648 16233 332240 18243 316249 14256 132337 20337 163374931 33234458 37 1835471 45 31636282 55 14373 95 61 516395110 38355124 71 123110155 34 3165191 116455 7648 332470 9456 18 48010666 316493122 75 14411013484 38 4165225139 12 4225261 MATCHED SHEETS 42 3324100 164109 3164120 144131 116 14 116 36 116 12 332 14 332 35 332 12 18 18 18 14 18 36 18 12 316316 316 38 316 12 14 14 14 30 412 14 34 141 516516 3838 3812 3634 381 1212 1234 121 58 55 34 34 Os 10 14 10 12 16 08 11 12 18 11 17 22 16 19 21 34 40 21 27 32 42 52 36 46 56 48 67 16 18 24 16 20 30 24 26 30 44 55 28 37 46 55 70 53 62 78 66 90 BALSA HOT LINE Call 806 745 6394 10am 6pm Central Time BALSA TRIANOL ES 36 25 8830 35 45 55 BALSA PLANKS36 86 0 00 1480 1123275 1124360 22225 23325 24435 33495 34668 TAPERED SHEETS36 142 65 143 65 382 83 23120 LONE STAREPOXY 90L sI--S 95 5so598 iSoro598 38 rro598 CUSTOM CUT CONTEST BALSA Sheets Piece ed Close Tolerances AAA Grade Dried ped 100% a serious modeler want performance must try 4-6 lb balsa LIGHT 4-6 LB WOOD 1 32 3 1/203 1163 332 3 183 3 163 143 383 123 343 13 1 164 3 324 184 3164 144 384 124 36 53 53 53 63 77 89 104 122 158 242 335 83 100 115 133 158 236 322 TRAILING EDGE 36 14132 51611439 3811246 12270 INSTANTOLUE 1 o TSck 298 10 750 298 20 T5ck 550 20 150 550 BASSWOOD 316316 31614 31638 31612 31634 1414 1438 1434 3838 3/812 3634 12 1 2 1234 BUNDLE DEALS 28116336695 201164361035 20332 336865 15332 436955 151/8336738 101/8436895 15318336920 10316436835 1014336655 101/4436830 103/8336870 53/84 36655 51/2336540 5124361580 10-3324 48885 518448500 5316 4 48600 514448645 48*NEW* 26Hundreds 30 38 46 cessories 60 ishing 42 materials 80 60 #10 SASE 70 atest 90 catalog 100SPRUCE STICKS 3648 18 181725 18 142026 18 3/822 32 316316 28 38 14 3/84055 14 124585 3/8 3/84969 38 126577 12 I/O6688 12347597 SPRUCE TRIANGLES 38 38 12 1 2 34 34 1846 18412 146 HARD MAPLE 1 4 36 3838 38 12 3834 1 2 IRCH DOWELS 18 316 14 516 38 18 40 45 50 58 68 36 09 11 14 25 32 3PiVBIRCH48 16412620 13212445 11612455 1812485 SPLVBIRCH 48 33212588 1/812 625 36316 12625 4714 12828 8438 12725 8112 12900 LITE PLY 48GROOVED LGMOUNTS lllachea 15538341840 3153834/532140 2501234916/45 495 V. Push-Pull/Masters Continued page 137 prop author owned full-scale Lake Amphibian pusher years found protecting propeller loose nuts bolts fishing rods always major concern twin engine push-pull arrangement especially vulner able front prop can kick up stones starter cables wiping cloths etc promptly present rear prop digestion Flying twin pusher also requires special watchfulness flight Push-Pull 240 near-fiasco Immediately after takeoff carburetor aft engine came loose moved pusher prop promptly seif-destructed en gine full bore extremely unbalanced tore itself firewallbefore fuel starvation saved day whole scenario lasted about three four seconds pilot Ray Doan brought ship back single engine thorough preflight check would have spared pusher prop main thing remember get Push-Pull smoothly aloft advance throttles steadily during takeoff Ground control will positive no torque cor rection required Clinibout will solid watch slice through ether sound twin 40s something else Radio Technique/Myers Continued page 37 RC34 through RC37 vice versa 2 next condition change comes out mathematics frequencies coo Image interfer ence will return few SC455s Some folks will remember 7296 Y/W used image 7208 Bn/W Well SC455s RCll-14 RC57-60 can af fected Tx within band have local oscillator wrong side assume manufacturers simply wont sell SC455s channels Besides image coincides exactly Common Car rier Tx frequencies RC Tx helps Rx low LO have possibility imaging TV4 RC44 problem know love So see nothing simple cure above simple Use dual conversion Rx entry-level RC system almost always uses SC455 manufacturers will have narrow-band pay attention proper LO signments keep off RCll 12 13 14 34 35 36 37 57 58 59 60 Jim didnt mention channel doubt above manufacturers just arent selling Indirect Interference condition comes out numbers called Second Order Intermodulation Product Interfer ence 21M generated ANY PAIR Tx operating 23 RC channel numbers apart difference two frequencies modu lated 460 kHz signal often goes right through 5C455 detected interference Think 21M generated JUST ONE PAIR Tx might hit OWBAM SC45Ss SO channels simultaneously including own Rx depending signal strength Rx tenna RECEIVER CHARACTERIS TICS Nobody uses odd-numbered RC chan nels RCll 13 15 today dont see 21M Can predict what will happen give 25 odd-numbered channels another service Now remember discussing RE CEIVER problems assumption everyone already using Gold-stickered narrowband transmitters Practically Tx built since 1987 good enough warrant sticker easiest way avoid problems listed above use dual-conversion receiver dont have block out ANY channels Jim manufacturer offers best dual-conversion receivers market relatively cheap recommend letter appropriate person named end last months column narrow-band 5C455 can work cause interferences discussed above z off 455 kHz intermediate frequency IF dead like 31M Narrow-band SC455s exist example Bob Aberle recently tested Polks Pow ermax Merlin system receiver 5C455 RC46 its LO low side An IF bandwidth 6 dB 2 kllz claimed nothing quoted 85 kHz Merlin performance meets AMA guide lines except ins LO wrong side does use dual conversion DC outper formed 1991 DC system have tested ex cept its PCM computer slow April 1989 141 LONE STAR MODELS1412 1623 S7th St Lubbock TX 79412 cant 46 Handling charge pay UPS Add $250 COD $300 extra PP APO FPO StateS accept Vs4 Master Card personal checks COO 6% 368/n TenaS US crrency Mnmom Wood Order 51000
Edition: Model Aviation - 1989/04
Page Numbers: 24, 25, 26, 27, 28, 29, 30, 31, 32, 34, 35, 136, 137, 141
NO OCR TEXT NO OCR TEXT Left aft hatch hides 6-oz fuel tank tar rear engine natchlfin unit rejainca wuin trappea o-a aovw-neea oumi ana iwo O-J nylon screws Right Removing front hatch reveals plywood keeper holding two wing dowels place Under Sig canopy Williams Bros pilot ready go wing bolt covers made aluminum cigar wrappers have painted match Left simple onset tail wheel tiller lessens servo shock during ground operations Right Fiberglass cowls nice addition model difficult make 4-oz weight nose cowl helps balance aft cowl may omitted desired Fuselage Use piece A-in Lite Ply 12 wide 48 long Determine whether want separate fiberglass nose cowl built-up front engine compartment opt built-up style add 4 part labeled PS front FW plan Placing Lite Ply under fuselage side view locate end points straight lines pin pressed ply Con nect points using ball-point pen Hav ing basic lines straight makes easy work drawing sides curved sec tion wing saddle can traced few pieces carbon paper slipped between plan plywood Cut out PS sand down lines shown plan Trace second side first cutting sanding outline Clamp two sides togetheror socket-head bolts attachIng cowls can reached hex ball-driver hold together small pieces masking tapewhile block sand identical size errors tracing inevi table Make sure edges square 6 x 12-in piece /16 birch ply used nose doublers F4 Use FS template Make cutout section gear mount P3 Apply very thin coat 30-minute epoxy doubler P4 position FS making sure allow firewall FW Use weights clamps until ep oxy sets Make right left fuselage side asme Haico B106-8 strut Du-Bro axle K&S 062 aluminum clip hold rugged plywood-reinforced wheel pants place sembling its respective birch nose doubler Make two aft doublers Fl 1 attach thin layer epoxy Allow correct spacing aft fire wall FR two small doublers F6 can also attached using white glue suggested sides resanded en sure upper lower edges true identical sides placed inside surface faces up carefully draw locations Fl F2 F5 F6 F7 Make firewall FW laminating A-in birch ply Cut FR X6-in birch ply Draw horizontal vertical thrust lines both sides firewall will using engines different makes pick heaviest tractor front unit engine including muf 26 Model Aviation DESIGNED BY AL MASTERS IG WC 813 CRrJOPY FI0ERGLR ccWL--pwORKW OP&BOJTOM 3A6LA GOLD8ER%RLBR_ \\ /axBf4L N / 2 _____ NGL016 pIY IV 13~gW 3/ 15 pUI y8%Y I3R$A Qj 4EET 1~ 4 C ~RVY 2 Weigh wing spars determine two heaviest Place 01 heavy spars right panel other left fler attached its mount position firewall canting counterclockwise see front view Hold thrust line indicated allow muffler clearance proper carburetor location respect fuel tank Mark drill firewall stall four 6-32 blind nuts three tend use fiberglass cowl back side aft engine side mounted exhaust down standard mount such Dave Brown 4045 can used light weight variety shown plans engine should placed close FR possible still allowing clearance Tatone EM 4Oss manifold Lite Ply spac ers can used between FR mount mount arms longer neces NOTE FRONT ENUINE INSTALLATION-TUT CHORE FOR CORRECT LOCATiON OF EARNURETOR IN RELATION TO FUEL TANR ATTACM MOUNT TO FERWALL WETTI FOUR 14-32 T-MJTS N BOLTS LOWER MATCR CR LITE PLYF13 1-1 II lOOT UTE PLYII MUFPLER LUCATIONfl I504 RALSA TRISTUCO I/S PLY 4.BOTCH FUR MAPLE MOCR IIIII I/U RALSA TRI-OSUCI I/O PLTiiAjTj I ICONSTRUCTION 010 iT - - NOTE SERVO SHOWN FROMLM PLY SERVO TRAY ELEVATOR AILERONS IRUODEU I/O PLY WOOD I/H PLT IHEMUVAMLEI 6 ~ITEj I/lU PLYPUPLY WITH F-IS I/O CITE PLYHI/lU PLY14-02 TNUT 0101EV HEAVY---2~ ATCH -- OUR IOUZI -UIIBUZI AU TWO-CYCLEFAIrSUORO S-b TUSOIOU MALSA--H \iiiEAGNEII-V TUCKI IF BALANCE IFUAMI SERVO04 L PLY WITHOUT I 1CUSYRUL MASTER AIRSCSEYR 0-14RATT LYSUPPORT GOLORERO 2 SONNER\V- 0-SO ECE1YLR 11400 EI51 TROT--I IFLUM001CR VUNISE HEAVY WALL FIREROLASS COWLP13 IA PRAX 4 00 COMPLEVEUTE PLYHATCH HALCO BlUR-UI/H -005/4 ALUM ROLl 002 005 ALUMLASOINO SEAM H OTLUS SLYTIVI LANOINO OEAR CLIPLIURTEN RAND TU FIT/ ER PLYWOOD- I/O PLY lBALSAZi4IA OOR LITE ATTOEB WITH 004-40 NUTO BOLT TO.. 145O SERER/NAT EAO _FUSELAGI VI E 000140 040 REMOVE NOT FROM RALCO UEAR TAP FOR 001400 VOLE -GZYS 010 500 04 sary should cropped off save weight Use three 4-40 blind nuts bolts install mount Remove mounts before continuing fuselage con struction Cut remaining fuselage components materials specified Note Fl A-in birch ply includes switch cut out F12 F13 shown actual length plan can traced piece Left Fuselage parts Lite Ply sides bottom conjunction birch ply balsa keep weight distribution under control No tice two pre-formed balsa skin pieces fuselage side dou blers have already glued place Above Completed basic fuselage straight lines design signify easy layout 28 Model Aviation wing ribs Irst cut out witn construc tion tabs left provide easy method building necessary wing washout Full-Size Plans Page 188 F-I2oR LITE PLYAFT ENGINE MOUNT 1/H Lire PLY SPACER ID OH 4 REOHIREBI 141 HOLES TO WATCH L/2BALSAENGINE CASE THFSTOCHI/TDA WALSH -I 052 KS S--ATTACH TO F-fl WITH LS KS/B BALSAALABINOM131 4-40 T-NUTS S BOLTS BLOCK3/8 SOFT BALSA TAP FOR I/O-ZOkS/H 010 FIHEHOLASS COWLSPINNER -I -flE-KAF-Il III iCANOPT- COCKPIT AREA IAIII III I I _ -II __IIIII I I/ZBALSAI OW PL F-Nil I11 ...I II THFSTOCK HATCH TONGUE - I F-ri II 711 UiI i -----ZINOES 10 K Fl/A H-SO RH HALTEPOXYOx 3/4 BALSAPOSHEK PHOP TRAPPED E TOP VIEW EPOOTPSAS SYWAW'\I/B LITE PLY 1/1K PLY--.....WAKE I/H TM-STOCK I 3HBALSA0TRIBTO L~--IF-SROBART DOW F-SL_________IT-NOT K-D2 IEPOOTIOs HEMOVE FOR FOEL illiiiTANK ACCESS IIIII pF-6Ul II 04A IRE ORR IN PkASYIC ISO 121 SODA BALSA F-R 1540KF-fl T I-P/KS/IS PLYWOND Fl-Ia 3 I/2T ____ 2-I/H L 1/2 3-I/O 3/sO WOSIC WISE -1/1K PLYWOOR - R 156 50 040K lOSSO 1OYEW MWSOWER IAFTER UFE OP WITH 15K SQ BRASSASH TO SHAPE TUBENOTE RUBBERS AWE 0*EL A2EAEJaLI I42AALKZ2RN 125 50 BRASS _____I/U BALSA SHEETTUBE SHER MW HODDEK ISOFTISOLDEK - 'I/IHPLTWOOO I/H LITE PLY SPOCEKS 3/32 BALSA-NBLENO 3/32 I-D4 AlASHEET7AT WATER 2 TI -.LL/TUPTYHO FOR B52 NYLONFS SCREW 121 STABILIZEHi~ -1/1K PLYWOHO LS LITE PLY NOTE AFT EWAIRE COWL IS USHT WEIGUT- LAYER H DO LOATH PLUS LAYER 2 02 OLSON AFT EWAINE 500k ALL BATEHIAL MEDIUM BALSA ARLESS SPECIFIED OTHER Sb WC HID CANOPY RE-WORKEOI niN - FRAY F-7"HATCH BALSAII F-00F-B STOCK vzziU ALL LYBx 3/4I --. SOFT BALSA FILL F-HTIWVOKD/B.-24T1 ALSAI________ __________________-N I/ZBALSA F-Il 01 "CLuRK FOG THI-STOCK .----Io --STABILIZ VL SOALSOWALSA I/BBRLSA R-BLOCK SHEET I/O BALSA THI-STOCKF-6ALS PLC T AID- H HEOKIHEB~----4-40 BOLT-REROOC HEAD OR 1/H LITE PLY PLY N ESOAKS/AF-90TH 00 BALSA BALSABASIC WIRE IEf7iLSOFT BALSA PLYCLUMP N SLOE FILL --1SPECIFICAT IONS - SECT A SAWS WING SPUN HO COT OOT AFTER/550 AREA SQ 14 3/52 BALSA SHEETZNZATTASH AFT-PLYWOWOWEISHY IFUELEDI 9 LSC HDZ ASSES BLY IW PLYMAKE 2WISH LSAOINU OZ AIRFOIL.IH 7 SERI-SYM 34K BALSA SHEET L/$3JWITB WASHOUT POWER TWO 00 ENOIRED F-IaF- IF-S-HATCH2-CYCLE TeNUE F-H BLITE PLY 121 MODEL AVIATION PUSH-PULL 240 TWIN ENGINE R/C MODEL DESIGNED BY AL MASTERS TRACING BY JOE DEMARCO sanded correct outline cut apart finished components should include drawn centerlines aid lineup during sembly Cut lightening holes F12 af ter separating F13 Glue six con struction aids F12 Make preformed 3A2 balsa skin aft fuselage section will need some household ammonia cardboard tube approximately three-inch diameter core tube Christmas wrapping paper works fine Left The wing panel begins take shape has turned over show construction tabs Above bare bones horizontal tall show lightweight structure Because engine vi bration1 must rugged conventional model April 1989 29 upper rudder fitted square brass tube assembles lower rud der tall wheel hatch offers easy ac cess fuel tank supplying aft engine Wheel pants cut 1-in balsa block reinforced 1/-in birch ply carve nice streamline shape ex tra drag helps slow model down during landing model twin has frontal drag single-engine model finished nose cowl foam plug roughed-out aft cowl plug aft cowl can omitted front cowl adds 4 oz much needed nose weight lightweight aft engine mount used help get right CG Select two 7-in lengths /32 sheet 6-in-wide stock Trim balsa 5in width soak ammonia STABILIZERS/B SO BALSA LEADING LEFT STABILIZER STARRI PA CITE PLY BEFORE I/B lI/A BALSA~OsA SEE SHEET RIBS ORE OBOESTRISTOCK VBx I/A BALSA RIB SUPPORT I2OBALS S/IHZ I/OFiLL BALSAJ 7BABORT3OBI/OSA HOBOij BALSA SPAR CSCRAP BALSA 01 I/Bx I/O BIB SUPTS015 ALA /1/ AOR PETLOWER SURFASE INSET / 3/0 SOFT BALSA SHEET S/TOZZRALSASHLfl IBS-SAEETI NOT SBOSAN OR LEFT / ROSA SARIS1/5 50 OARS 3/32 SCRAPTA CONTOURBALSA BALSA RIBSvO BALSA SHEET BATE TRIAL FIT STAR TO VFOSELAAE BEFORE ATTACRIRS VA SO BALSA I FILLELEV-STAB SECTI LVI I/A BALSA I COVERING STAB IIAVA SCREAj~ PUT 7ORILL FOR ipL5/32 B BI I/A BALSA LEASISS OIS ALUMEASEy 0/01122n-p-iiBALSA /_____UWING ____ I_ ~1I _____ PLAN TOP VIEW _______I BALSASBIItZ BALSA 5/52 BALSAI I/B xl BALSA LE3/Az OBEET RIRIO V4x S/B I/B I/O BALSABALSA SOB LEABISA EPSEI/H BALSA2 RISER 5PM SHEETWITHOUT CAP S/SO RALSAVA 120BALSA WISE SHEETINGSPARS 5/52 BALSA least five minutes Blot wood pa per towel wrap around tube using masking tape hold place Set balsa skin aside allow air dry thor oughly Save ammonia another proj ect Begin assembling fuselage over top view plan Support sides up right glue firewall place using F5 spacer Use white glue since will allow time lining everything up Place weight such ordinary brick top front edges fuselage sides clamp FW place pull aft fuselage section together time lower fuselage line forward F5 straight weight will keep setup square work surface until glue sets Attach FR using white glue 10-minute epoxy aid clamp Hold sides together attach F6 cyanoac rylate CyA Add two 14 x %-in crosspieces fit Fl 1 Check position WINO L DIHEDRAL DETAIL NOT SCALE F5 tack CyA Make relief notches Fl clear blind nuts back side FW Force Fl position will aid correcting misalignment front firewall F5 attach CyA Install /6 x A-in hardwood servo rails make servo tray A-in ply fit After gluing F3 place set fuselage asideyoull com pleting laterand proceed wing Wing Trace cut set ribs using pattern make second set Fin ish sand ribs pairs draw chord lines shown both sides rib Cut dihedral braces draw two centerlines indicated both sides leading edge brace Cover wing plan wax paper plastic film before pro ceeding Cut four straight x A-in balsa spars length point weigh four pieces distribute spars avoid using LS 1122 SUB LEAGIRS EDGE 30 Model Aviation Due heavy side loads engine weight necessary use birch ply hardwood lower tail post system Note soldered upper lower torque rods Full-Size Plans Available Page 188 I/B BALSA REMOVE FOR SERVOSMEET IFI 2 Q1 — U AILERON SERVO-L SOFO RULVA- 01 LI lb 0I RALSA OREET IOFT ALSA SO EDGE S/IA DIA DOWELS WINO SOLO SOWN I] NOTE BIBS 2 TRRU 12 ABE 5/32 BALSA SHEET 3 [I 45678910II12 111 II r I OR BALSA SHEET WISH YIP FRAMES I/R PLVWDODV UPPERI/R PLYWOOD_______ I/R LITE PLO1QWiR t __ LEADING EDGE VA PLYWOOD S/DO RALSA SHEET TVP H BOVVOMjSERVO DOONYDIHEDRABRACESWING TIP DETAIL HAL NA S/HI/O /0 BALSA1II______ 71 FILLHOII WINO BOLT PLY4 ACCESS I/O BALSA SUBEE -PUSHPULL 240 3/BR I/O OIL STOCHL --TWIN ENGINE R/C MODEL RI LIGHTENINS ROLES ISV BTA FUSELAGEI/IS BALSA SHEETDESIGNED BY AL MASTERS SIDEBATH SIDESWORK SURFACE I254NTRACING BY OE DEMARCO IIIII ALL RIGHTS RESERVED FILL ISO MUSIC IKE EPOOVI / I/B BRASS TUBE EPOXY TO OK aileron servo carried well forward wing Z-bends A-ln music wire pushrods used connect servo Arm II I-V117j4I TRI-STOCEILIli-TiI #~p Iftv 11-----S I/B LIVEF4[~SRWVAII DLV April 1989 31 receiver battery pack three servos nestled lower nose section below 12oz front fuel tank dual take-offs 5-26 servo controls throttles both engines Left Both K&B 40 05 4OFP have used tor tne aft engine witn equal success Lite Ply spacers firewall provide clearance Tatone manifold Right fuel tank nose compartment sealed keep fuel leaking electronics below two heaviest same wing panel postal scale coding used Glue lower ply dihedral brace spar halves position spar over plan securing pins weights Position ribs 1 through 12 spar making sure construction tabs resting work surface x %-in trailing edge x /2-in leading edge pinned place ribs aid lineup space between ribs 1 2 pro vides leading edge brace will slipped later After making sure ribs perpen dicular work surface CyA ribs spar leading edge trailing edge Fit upper spar glue place Block sand upper surface trailing edge slightly follow rib contours Select four sheets %2 balsa 2-in stock upper lower trailing edge skins Check weights using two heaviest opposite panels Hold metal yardstick edgewise across ribs board sheet edge certain sheet line will straight attached ribs high rib can carefully sanded down dont worry about low rib point Turn wing over Using piece wood such ruler press wing down ward contact %2 sheet bond ribs CyA Work about three ribs time starting rib 1 skipping low ribs Maintaining straight sheet line out waves important gluing rib chip A-in triangle stock can used support skin low rib cap strips added later will hide multi tude construction errors Build wing tip attach rib 12 Center tip rib chord line leading edge 4 x %-in trailing edge balsa filler trailing edge tip will allow block sanding fit con tours %2 sheet aileron Attach tip webs will final sanded after rib caps place Add four hinge supports vertical-grain %2 spar webs between ribs 3 12 Fit rib iF place panel inch off work surface rib 12 set iF perpendicular work surface glue trailing edge spar notch tack gluing leading edge Note iF shown actual length plan reaches leading edge strip Allow space spar notches fit dihedral brace mating spars later Set panel aside construct oppo site panel similar manner completed second panel work surface fit two panels together El evate first panel 2 per draw ing push lower spars together until butt Slightly bevel spar end ob tain good fit upper dihedral brace slipped alongside upper spars clamped using least two clamps side wing centerline Make sure %-in dihedral brace fits flush slightly below spars sanding down later will difficult Add leading edge ply brace clamping same manner Rib iF will have razor sawed shorter Make sure horizontal centerline leading edge di hedral brace located correctly ribs 1 2 both panels bottom edge of servo mount sec Continued page 34 32 Model Aviation finished model resting authors balancing rack Location correct cxi shoula always determined model before making first trip out flying field idea RC Push-Pull 240 came WW Ii Dornier-335 Reported worlds fastest propeller-driven aircraft its time war ended before could made operational youve ever fuel tank split leak fuel fuselage know important install tank can trust Du-Bro Products manufactures complete line rugged polypropylene tanks 10 convenient sizes 2oz 24 oz guaranteed life against splitting leaking money back tank comes complete soft brass tubing hardware Protruding front lip prevents fuel lines being crimped hard landings Single twin vent design gas conversion stopper available use tank gasoline Cat No 400 Visit local Hobby Shop fuel hook up accessories can Cap Fittings In-Line Fuel Filter 0 Fuel Tubing Kwik Fill Fuel Value Gas Gb Fuel Tank Filter KwkF Fue Pump tion should parallel work sur face wing level upper spar leading edge clamped rear section wing panels butted trailing edge make final check spars run straight tip tip Hit ar eas CyA Carefully turn wing over clamp lower dihedral brace two clamps CyA Add four 3A-in triangle braces ribs 1 2 Complete center section shear webbing cut off con struction tabs Add balsa filler blocks trailing edge bays between ribs 1 iF Carve notch bottom iF accept W2 Install latter gluing flush bottom rib 1 Remove section iF accommodate aileron servo location Wl can shifted neces sary allow space aileron servo stall Wi add A-in triangles support W2 upper lower leading edge sheets attached /16 overhang leadmg edges Wetting outside surface sheets will make forming easier sheet edges will block sanded until leading edge provide flat gluing surface x 1-in leading edge cap Fasten -in -thick scrap spacer along leading edge masking tape Place wing fuselage check saddle area fit Remove wing epoxy hardwood hold-down blocks place temporary x -in cross brace glued near blocks fuselage side support epoxy has cured align wing fuselage hold place masking tape Drill through W2 hardwood blocks Y6 bit held perpen dicular W2 Remove wing re drill W2 A-in bit Tap blocks A-20 wing bolts Bolt wing place drill two s through F5 leading edge Wi Trial fit two /, dowels shown plan Use soft balsa foam filler around the wing bolt holes sanding down center section top sheeting Remove dowls complete wing sheeting rib caps leading edge cap Drill through leading edge cap /16 bit two dowels epoxied after wing has covered Ailerons Cut two aileron cores 3/ x 1-in aileron stock After making lightening holes cover ailerons /l6 sheet balsa Drill four holes hinge pins 1-in bit drill %2 hole torque rod Transfer hinge locations wing drill Trial fit ailerons hinge pins /2 torque rod assemblies alignment correct epoxy brass tubes onto wing trailing edge Remove ailerons final sanding covering Fuselage-wing assembly rmal fuse lage construction Razor saw two slots 34 Model Aviation top F5 sand accept wing dowels make /6 drilled holes oversized dowels inserted bolt wing place Lay small piece wood across top dowels trace its lower edge line location F5 Move down /16 below line just made fit piece A-in ply between dowel holes epoxy F5 Epoxy 3A-in triangle brace under ply Drill /16 hole center through ply tap A-20 bolt Treat hole CyA A-in ply wing hold-down has A-in drilled hole see drawing detail Cut two fuselage trim pieces / x % x 15 long medium-hard balsa Glue top FS extend yond FR about 4 dont glue beyond F7 Make /16 notch trim piece allow pulled together slightly behind FR secured rub berband tape Slip piece wax paper between FR FlO clamp FlO FR Glue FlO trim pieces being careful bond latter FS Cut piece x M-in balsa width F7A Add /16 ply top drill 140 hole #27 bit shown Glue x s-in piece top trim piec es F7 Glue F7A top crosspiece after fitting over /16 ply stall 1 A-in-long 6-32 socket-head bolt washer through 140 hole Use small piece tape keep bolt fall ing out Trim section preformed %2 skin fit between F7 FR overlapping both slight ly Sand bottom edges theyre alignment top trim pieces mate F7A FlO CyA skin trim pieces Aft hatch Razor saw remove aft ex tensions trim pieces cut through F7 Remove hatch section com plete application CyA F7A FlO piece plastic soda straw epoxied place will keep 6-32 bolt trapped Sand %2 skin flush F7A Install F8 F9 through slots cut formed skin Small pieces triangle stock add final rigidity unit Complete hatch front hold-down placing piece /16 ply 6-32 blind nut under two x 3A-in fuselage crosspieces Line up hatch snug up 632 bolt Use Du-Bro ball wrench inserted through small hole skin CyA ply place remove hatch epoxy ply cross members two /16 ply aft hold-down tongues installed follows Shave off excess material inside hatch trim piec es 6-32 bolt masking tape rear holding hatch place work through opening fuselage bottom Position ply tongues tack CyA F9 %2 sheet bond FS Remove hatch ep oxy tongues Again bolt hatch secure Continued page 136 EffectiveJanuary 1989 Fox motors except Combat supplied muffien some time have using soft sell approach columns customers direct some excerpts letters have received Eric larson Pine Grove CA Fox Mfq Yesterday bought Fox 4OBB Delux thefirst Fox engine have owned some apprehension bought anything other OS engine have burned before buying off brand engines Today am convened Fox 40 40SF similar both start idle magnfkenrly cant tell dfference power thats similarities end Fox 40 vibrates less easier adjust lighter comes great spinner costs hoff much American made hove now made sure everyone myflying club knovs what great buy Fox engines THANK YOU FOR QUALITY PRODUCT Eric Branham Paris IL r purchasing 40 Delux year lam impressed performs exceptional lot better OS Are planning replace Eagle III update 60 size will assured will first line purchase Jon Armitage Indiana PA ed send letter praise about motors motors used flew C/L FE started RC about year ago decided try Super Tiger 25 0S4 Stroke 40 good came bock Fox power quality handling allot decent price engines popular field Will Sgarlat Cape Cod MA note tbonksfor youve donefor wonde4izl hobby yourflne engines Dukes Mixture column temfic service offer us accidentally smash up Fox engines beyond what theyd care tackle repair Westley Keller Gouster OH have meaning drop linefor some time 40 motor trouble replaced put icing cake will never run anything planes unless says Fox side performance service says subject Decals present time am running 8 Fox engines am requesting Decals accordingly Alse lam lookingforsvard coming Eagle 4 Keep going best engines world Barry Doughty Absecon NJ placed old OS Max 60 Clipped Wing Cub Top Elite new Fox SOBA WOW what engine no vibration started right out box no adjustments Idled good accelerarionfrom idle full bock reenfic Weight bigfactor purchasing SOBBRC lighter OS SuperTigre Come etc Also must add replacement parts economical foreign imports Coming landing motor idled down beautifully settled infor great landing Again engine something else loads power very easy onfuelfor SO size engine John Holder Ob Seeverson AL ne obviously drfective else would have pulled wings off Aerostor 40 Seriously very pleased myfirse Fox engine Vaughn Kempf Modern Hobbies Miles City MI wanted take afew minutes send afew wards praise way talked three customers buying Fox 4OBB Delux motors quite impressed motors have couple observations pass along First havefound performancefigures seem little conservative modest measuring 14000 plus Master Airscrew 10 x 6 props using Royol Pro Tachfor readings Idle lower other 40 Ive ever ron realiable during spins soaps inverted idling Kenneth Wilson Schenectady NY know lam loyal satisfied Fox engine user over years Ive owned U/C 36 Fox R/C engines such Fox 2S early Fox 40 Eagle III currently own 2 Eagle Ills must compliment quality value youve designed built Fox engines Corey Wills Perryville MO compliment having thefinest engines made Several myfriends have flying Fosfor past three orfour years wouldnt give up other engine somewhat higher prices lately still cant beat affordability reliability performance Doc Matthess Wichita KS drop note express pleasure over engine Fox 45 Excellent midrange easy start set super neat spinner set up andfinally sofe incredible power larry Maltman Winnipeg Canada k kindlyfor promptly courteouslyfilling last order appreriate excellent service seems todays hurried ways few businesses take time what just seemed naturalfor Fox Mfg Ca have active builder/flyer since 1962 Myflest Fox engine reliable durable lam also happy state additional 17 Fox engines have purchased since 1962 running reliably consistently lester Goldsmith Action Hobbies Memphis IN riting tell Fox 60 Heli Engine has cranked run flawlessly rightfrom start Enclosed pictures Schluter Scout 60 1 did test run engine before installing believe really necessary because just cranked Fox 45 Heli today new unrun except byyourfacroryj new Schluter Junior though test run too cronked ran immediately idled perfectly very smooth believe word getting around Fox best buys now because compression al ways good making starting good power output always above average tops confirmed test articles magazines Life always goad because appear cut corners importantfeatures such bushed conn rods grades material Ruts always hand tap factory service unmatched anysvhere Eugene Mathis Daphne AL Fox 4OBB out Clubfleld last Saturday kicked tires lit thefires took off leaned bit andflight number twa went whole tank really started come Flight 3 very spectacular pulling vertical stall turn Ifinally throttle off hung prop just kept going veritable hoss because Kaos 40 weighs ran Walter Pawlukanis Oakhurst NJ normally write manufacturers anyone else asfar goes matter offact cant remember wrote last However am really impressed Fox 4OBB Delux WOW what engine have mounted 40 size Ugly Stik type airplane about 2-1/2 gals offuel through irsofar Eyes popping started right up required some hi 5 peed adjustment Since until now has gotten better better Vertical performance just doesnt quit ttle response certain sure Im willing wager bet money its certainty AlMancini las Angeles CA te thank youfor incredibly fast turn around phone order Onward Upward Andy Keeley Memphis IN ht Eagle III put 6-1/2 pound airplane next day flyingfield great airplane vertical performance needed Thank great engine also like Dukes Mixture Model Airplane News Happy Flying Manufacturing Company 5305 Towson Avenue Fort Smith AR 72901 Phone 501 646-1856 April 1989 35 Freebees available time new color catalog new price sheets parts sheersfor 1988 1989 model motors wauld appreciate receiving seffaddressed envelape twa stamps however masking tape rear Drill through sides tongues #29 bit 136 tap 8-32 nylon screws Replace fit hatch Sand Y32 skin flush FR Fit forward section formed sheet glue place hatch place shave sand trim pieces shape F6 aft FS Cowls nose cowl adds needed weight attaining correct center-of-gravity aft cowl merely cosmetic lost foam method can used make fi berglass cowls Styrofoam forms made undersized allow cowl wall thick ness Use batches Hobbypoxy 2 four layers 6-oz cloth strips nose cowl aft cowl takes layer same size strips Add final layer 2oz cloth both units After epoxy has set gouge out foam use acetone remove resi due ply cowl mounts installed last epoxy strips fiberglass cloth nose cowl should have final weight 4 oz Use hex ball-driver reach hid den socket-head bolts use extended sides FS shaped balsa blocks instead glass nose cowl may need add nose weight correct centerofgravity Empennage Its important build sta bilizer light strong aft engine right trying shake apart Build main frame flat over plan protected wax paper Notch tip pieces R-in-sq hard balsa spar Add 10 rib supports hinge blocks Dont forget A6 ply trailing edge doubler Trial fit frame fuselage Posi tion A-in-sq balsa inboard ribs hug fuselage sides sanding ribs ap propriate contour procedure allows unit covered prior attachment fuselage Add remaining ribs fit four A-in vertical-grain braces will epoxied place after stabilizer has covered attached Assemble elevators /I6 dowel block sand shape 015 alumi num support formed around dowel Build upper lower fins associated rudders upper rudder has groove its lower edge accept Y32 wire torque rod Fit upper fin place over F8 F9 lower fin tail post A-in birch ply predrilled A-in bit hinge point Make lower fin including /16 ply bearing piece %2-in hole lower torque rod trailing edge fin clamped glued after hard wood block formed tail wheel wire has glued place Add soft balsa filler set aside Rudder torque rods make upper torque rod start cutting two pieces % music wire making 2 sec ond 4/2 long Make 900 bend 1 end Solder -in sec tion K&S 125-in-sq brass tubing its end 3A-in leg Allow no solder outside brass part Tinning wire first sweat ing brass wire makes nice neat job Make upper torque rod Solder /2in piece 125-in-sq brass tubing onto end 1-in leg 2%-in piece 156-in-sq brass tubing slipped over 125 tubing ered Lay upper lower torque reds flat board relative positions Assem ble lower tube upper tube telescope mating parts one-fourth inch Tackle upper wire assembly soldering iron remelting upper joints applying very light pressure both 900 arms resting flat sur face arms will now lined up parts assembled specified before remelting lineup risk fusing whole assembly making un usable Telescope two parts checking ease fit dimensions Assembling covering Finish fuse136 Model Aviation ELECTRIC SEMI-SCALE Radio Control Sport/Trainer Wing Span 67 3/4 Length 37 1/2 EIII see Local DeCirn PAUL K GUILLOW INC WAKEFIELD MA 01880 Push-Pull/Masters Continued page 35 lage assembly fitting top batch canopy area sealing front fuel tank area epoxy Fl P2 provide fueltight compartment protect electronics carried below Assemble controls sup porting necessary Add triangle stock close up compartment F13 Cut lower hatch provide retaining Attach Halco strut four 4-20 aluminum bolts plastic nuts wheel pants sawed 4 x 12-in balsa block thick Reinforce A-in birch ply Resist tempta tion carve sand wheel pants nice streamlined shape need cer tain heft order contribute drag land ing time Remember although two engines idle frontal drag area single engine After final sanding vacuuming free dust cover individual parts favor ite material Coat both firewalls epoxy inside out covering stabilizer leave bottom center section open Position stab attach CyA checking align ment carefully Pass lower torque rod through /I6 ply bearing Fit lower fin slot F12 clamp lower tail post A-in Lite Ply fuselage cross brace Square up epoxy fm leading edge inside fuselage Attach A-in ply lower tail post A-in Lite Ply cross brace using CyA Glue four vertical-grain A-in braces stabi lizer fuselage sides Close up stab center section Push lower rudder over torque rod epoxied hinge point Make sure treat center hinge point pe troleum jelly expect hinge action af ter epoxy cures Angle upper torque rod position through its ply bearing join two torque rods Fit aft hatch place bolt Assemble upper rudder its hinge point Line up two rudders epoxy upper torque rod groove bottom rudder Install elevators attach 015in aluminum support aft firewall two No 2 screws Secure tail wheel tiller loop lower rudder small rubberband bound tightly possible tail wheel off set rudder pushrod undersize minimize servo shock engines place pipe up fuel systems using pressure both Use Hig ley Heavy Hub Master Airscrew 10-6 prop up front lighter Zinger 10-6 wood pusher prop rear combina tion will give extra 3 oz up front counts Install electronics feeding anten nae back through upper lightening holes snaking out three holes left side just above stabilizer Flying single servo controls both throt tIes using Du-Bro EZ connector ca ble arrangement servo throttle linkage can independently adjusted Set front engine reliable idle high-trim position Low trim should cut engine Kill front engine set up aft engine same manner Setting up engines manner makes unlikely both can cut off precisely same time However pre sents no problem since engine should fail final approach go-around single engine readily made desired Its unnec essary synchronize engines just have both running well Its important aft fuel tank car ried high possible within tail sec tion use piece l-in-thick foam under tank Since engine pusher configu ration does have rain carburetor air tank location relation needle valve critical order avoid early starvation fuel level lowers small sheet metal scoop attached direct rain air carburetor throat Although worked ef ficiently carrying tank higher much less trouble equally effective Keep simple Note also rear tank clunk stalled forward position Having used clunk pickup both directions pushers Ive found forward installa tion satisfactory requires much less fuel line As aircraft having pusher propel lers special precautions must observed prevent debris going through Continued page 141 April 1989 137 1t I] iyu 111 E1ii RE SHOOTING DOWN HIGH BALSA PRICES WITH SUPER QUALITY Satisfaction Guaranteed Direct Only BALSA SHEETS 36 48 30 BALSA STICKS 3648 16233 332240 18243 316249 14256 132337 20337 163374931 33234458 37 1835471 45 31636282 55 14373 95 61 516395110 38355124 71 123110155 34 3165191 116455 7648 332470 9456 18 48010666 316493122 75 14411013484 38 4165225139 12 4225261 MATCHED SHEETS 42 3324100 164109 3164120 144131 116 14 116 36 116 12 332 14 332 35 332 12 18 18 18 14 18 36 18 12 316316 316 38 316 12 14 14 14 30 412 14 34 141 516516 3838 3812 3634 381 1212 1234 121 58 55 34 34 Os 10 14 10 12 16 08 11 12 18 11 17 22 16 19 21 34 40 21 27 32 42 52 36 46 56 48 67 16 18 24 16 20 30 24 26 30 44 55 28 37 46 55 70 53 62 78 66 90 BALSA HOT LINE Call 806 745 6394 10am 6pm Central Time BALSA TRIANOL ES 36 25 8830 35 45 55 BALSA PLANKS36 86 0 00 1480 1123275 1124360 22225 23325 24435 33495 34668 TAPERED SHEETS36 142 65 143 65 382 83 23120 LONE STAREPOXY 90L sI--S 95 5so598 iSoro598 38 rro598 CUSTOM CUT CONTEST BALSA Sheets Piece ed Close Tolerances AAA Grade Dried ped 100% a serious modeler want performance must try 4-6 lb balsa LIGHT 4-6 LB WOOD 1 32 3 1/203 1163 332 3 183 3 163 143 383 123 343 13 1 164 3 324 184 3164 144 384 124 36 53 53 53 63 77 89 104 122 158 242 335 83 100 115 133 158 236 322 TRAILING EDGE 36 14132 51611439 3811246 12270 INSTANTOLUE 1 o TSck 298 10 750 298 20 T5ck 550 20 150 550 BASSWOOD 316316 31614 31638 31612 31634 1414 1438 1434 3838 3/812 3634 12 1 2 1234 BUNDLE DEALS 28116336695 201164361035 20332 336865 15332 436955 151/8336738 101/8436895 15318336920 10316436835 1014336655 101/4436830 103/8336870 53/84 36655 51/2336540 5124361580 10-3324 48885 518448500 5316 4 48600 514448645 48*NEW* 26Hundreds 30 38 46 cessories 60 ishing 42 materials 80 60 #10 SASE 70 atest 90 catalog 100SPRUCE STICKS 3648 18 181725 18 142026 18 3/822 32 316316 28 38 14 3/84055 14 124585 3/8 3/84969 38 126577 12 I/O6688 12347597 SPRUCE TRIANGLES 38 38 12 1 2 34 34 1846 18412 146 HARD MAPLE 1 4 36 3838 38 12 3834 1 2 IRCH DOWELS 18 316 14 516 38 18 40 45 50 58 68 36 09 11 14 25 32 3PiVBIRCH48 16412620 13212445 11612455 1812485 SPLVBIRCH 48 33212588 1/812 625 36316 12625 4714 12828 8438 12725 8112 12900 LITE PLY 48GROOVED LGMOUNTS lllachea 15538341840 3153834/532140 2501234916/45 495 V. Push-Pull/Masters Continued page 137 prop author owned full-scale Lake Amphibian pusher years found protecting propeller loose nuts bolts fishing rods always major concern twin engine push-pull arrangement especially vulner able front prop can kick up stones starter cables wiping cloths etc promptly present rear prop digestion Flying twin pusher also requires special watchfulness flight Push-Pull 240 near-fiasco Immediately after takeoff carburetor aft engine came loose moved pusher prop promptly seif-destructed en gine full bore extremely unbalanced tore itself firewallbefore fuel starvation saved day whole scenario lasted about three four seconds pilot Ray Doan brought ship back single engine thorough preflight check would have spared pusher prop main thing remember get Push-Pull smoothly aloft advance throttles steadily during takeoff Ground control will positive no torque cor rection required Clinibout will solid watch slice through ether sound twin 40s something else Radio Technique/Myers Continued page 37 RC34 through RC37 vice versa 2 next condition change comes out mathematics frequencies coo Image interfer ence will return few SC455s Some folks will remember 7296 Y/W used image 7208 Bn/W Well SC455s RCll-14 RC57-60 can af fected Tx within band have local oscillator wrong side assume manufacturers simply wont sell SC455s channels Besides image coincides exactly Common Car rier Tx frequencies RC Tx helps Rx low LO have possibility imaging TV4 RC44 problem know love So see nothing simple cure above simple Use dual conversion Rx entry-level RC system almost always uses SC455 manufacturers will have narrow-band pay attention proper LO signments keep off RCll 12 13 14 34 35 36 37 57 58 59 60 Jim didnt mention channel doubt above manufacturers just arent selling Indirect Interference condition comes out numbers called Second Order Intermodulation Product Interfer ence 21M generated ANY PAIR Tx operating 23 RC channel numbers apart difference two frequencies modu lated 460 kHz signal often goes right through 5C455 detected interference Think 21M generated JUST ONE PAIR Tx might hit OWBAM SC45Ss SO channels simultaneously including own Rx depending signal strength Rx tenna RECEIVER CHARACTERIS TICS Nobody uses odd-numbered RC chan nels RCll 13 15 today dont see 21M Can predict what will happen give 25 odd-numbered channels another service Now remember discussing RE CEIVER problems assumption everyone already using Gold-stickered narrowband transmitters Practically Tx built since 1987 good enough warrant sticker easiest way avoid problems listed above use dual-conversion receiver dont have block out ANY channels Jim manufacturer offers best dual-conversion receivers market relatively cheap recommend letter appropriate person named end last months column narrow-band 5C455 can work cause interferences discussed above z off 455 kHz intermediate frequency IF dead like 31M Narrow-band SC455s exist example Bob Aberle recently tested Polks Pow ermax Merlin system receiver 5C455 RC46 its LO low side An IF bandwidth 6 dB 2 kllz claimed nothing quoted 85 kHz Merlin performance meets AMA guide lines except ins LO wrong side does use dual conversion DC outper formed 1991 DC system have tested ex cept its PCM computer slow April 1989 141 LONE STAR MODELS1412 1623 S7th St Lubbock TX 79412 cant 46 Handling charge pay UPS Add $250 COD $300 extra PP APO FPO StateS accept Vs4 Master Card personal checks COO 6% 368/n TenaS US crrency Mnmom Wood Order 51000
Edition: Model Aviation - 1989/04
Page Numbers: 24, 25, 26, 27, 28, 29, 30, 31, 32, 34, 35, 136, 137, 141
NO OCR TEXT NO OCR TEXT Left aft hatch hides 6-oz fuel tank tar rear engine natchlfin unit rejainca wuin trappea o-a aovw-neea oumi ana iwo O-J nylon screws Right Removing front hatch reveals plywood keeper holding two wing dowels place Under Sig canopy Williams Bros pilot ready go wing bolt covers made aluminum cigar wrappers have painted match Left simple onset tail wheel tiller lessens servo shock during ground operations Right Fiberglass cowls nice addition model difficult make 4-oz weight nose cowl helps balance aft cowl may omitted desired Fuselage Use piece A-in Lite Ply 12 wide 48 long Determine whether want separate fiberglass nose cowl built-up front engine compartment opt built-up style add 4 part labeled PS front FW plan Placing Lite Ply under fuselage side view locate end points straight lines pin pressed ply Con nect points using ball-point pen Hav ing basic lines straight makes easy work drawing sides curved sec tion wing saddle can traced few pieces carbon paper slipped between plan plywood Cut out PS sand down lines shown plan Trace second side first cutting sanding outline Clamp two sides togetheror socket-head bolts attachIng cowls can reached hex ball-driver hold together small pieces masking tapewhile block sand identical size errors tracing inevi table Make sure edges square 6 x 12-in piece /16 birch ply used nose doublers F4 Use FS template Make cutout section gear mount P3 Apply very thin coat 30-minute epoxy doubler P4 position FS making sure allow firewall FW Use weights clamps until ep oxy sets Make right left fuselage side asme Haico B106-8 strut Du-Bro axle K&S 062 aluminum clip hold rugged plywood-reinforced wheel pants place sembling its respective birch nose doubler Make two aft doublers Fl 1 attach thin layer epoxy Allow correct spacing aft fire wall FR two small doublers F6 can also attached using white glue suggested sides resanded en sure upper lower edges true identical sides placed inside surface faces up carefully draw locations Fl F2 F5 F6 F7 Make firewall FW laminating A-in birch ply Cut FR X6-in birch ply Draw horizontal vertical thrust lines both sides firewall will using engines different makes pick heaviest tractor front unit engine including muf 26 Model Aviation DESIGNED BY AL MASTERS IG WC 813 CRrJOPY FI0ERGLR ccWL--pwORKW OP&BOJTOM 3A6LA GOLD8ER%RLBR_ \\ /axBf4L N / 2 _____ NGL016 pIY IV 13~gW 3/ 15 pUI y8%Y I3R$A Qj 4EET 1~ 4 C ~RVY 2 Weigh wing spars determine two heaviest Place 01 heavy spars right panel other left fler attached its mount position firewall canting counterclockwise see front view Hold thrust line indicated allow muffler clearance proper carburetor location respect fuel tank Mark drill firewall stall four 6-32 blind nuts three tend use fiberglass cowl back side aft engine side mounted exhaust down standard mount such Dave Brown 4045 can used light weight variety shown plans engine should placed close FR possible still allowing clearance Tatone EM 4Oss manifold Lite Ply spac ers can used between FR mount mount arms longer neces NOTE FRONT ENUINE INSTALLATION-TUT CHORE FOR CORRECT LOCATiON OF EARNURETOR IN RELATION TO FUEL TANR ATTACM MOUNT TO FERWALL WETTI FOUR 14-32 T-MJTS N BOLTS LOWER MATCR CR LITE PLYF13 1-1 II lOOT UTE PLYII MUFPLER LUCATIONfl I504 RALSA TRISTUCO I/S PLY 4.BOTCH FUR MAPLE MOCR IIIII I/U RALSA TRI-OSUCI I/O PLTiiAjTj I ICONSTRUCTION 010 iT - - NOTE SERVO SHOWN FROMLM PLY SERVO TRAY ELEVATOR AILERONS IRUODEU I/O PLY WOOD I/H PLT IHEMUVAMLEI 6 ~ITEj I/lU PLYPUPLY WITH F-IS I/O CITE PLYHI/lU PLY14-02 TNUT 0101EV HEAVY---2~ ATCH -- OUR IOUZI -UIIBUZI AU TWO-CYCLEFAIrSUORO S-b TUSOIOU MALSA--H \iiiEAGNEII-V TUCKI IF BALANCE IFUAMI SERVO04 L PLY WITHOUT I 1CUSYRUL MASTER AIRSCSEYR 0-14RATT LYSUPPORT GOLORERO 2 SONNER\V- 0-SO ECE1YLR 11400 EI51 TROT--I IFLUM001CR VUNISE HEAVY WALL FIREROLASS COWLP13 IA PRAX 4 00 COMPLEVEUTE PLYHATCH HALCO BlUR-UI/H -005/4 ALUM ROLl 002 005 ALUMLASOINO SEAM H OTLUS SLYTIVI LANOINO OEAR CLIPLIURTEN RAND TU FIT/ ER PLYWOOD- I/O PLY lBALSAZi4IA OOR LITE ATTOEB WITH 004-40 NUTO BOLT TO.. 145O SERER/NAT EAO _FUSELAGI VI E 000140 040 REMOVE NOT FROM RALCO UEAR TAP FOR 001400 VOLE -GZYS 010 500 04 sary should cropped off save weight Use three 4-40 blind nuts bolts install mount Remove mounts before continuing fuselage con struction Cut remaining fuselage components materials specified Note Fl A-in birch ply includes switch cut out F12 F13 shown actual length plan can traced piece Left Fuselage parts Lite Ply sides bottom conjunction birch ply balsa keep weight distribution under control No tice two pre-formed balsa skin pieces fuselage side dou blers have already glued place Above Completed basic fuselage straight lines design signify easy layout 28 Model Aviation wing ribs Irst cut out witn construc tion tabs left provide easy method building necessary wing washout Full-Size Plans Page 188 F-I2oR LITE PLYAFT ENGINE MOUNT 1/H Lire PLY SPACER ID OH 4 REOHIREBI 141 HOLES TO WATCH L/2BALSAENGINE CASE THFSTOCHI/TDA WALSH -I 052 KS S--ATTACH TO F-fl WITH LS KS/B BALSAALABINOM131 4-40 T-NUTS S BOLTS BLOCK3/8 SOFT BALSA TAP FOR I/O-ZOkS/H 010 FIHEHOLASS COWLSPINNER -I -flE-KAF-Il III iCANOPT- COCKPIT AREA IAIII III I I _ -II __IIIII I I/ZBALSAI OW PL F-Nil I11 ...I II THFSTOCK HATCH TONGUE - I F-ri II 711 UiI i -----ZINOES 10 K Fl/A H-SO RH HALTEPOXYOx 3/4 BALSAPOSHEK PHOP TRAPPED E TOP VIEW EPOOTPSAS SYWAW'\I/B LITE PLY 1/1K PLY--.....WAKE I/H TM-STOCK I 3HBALSA0TRIBTO L~--IF-SROBART DOW F-SL_________IT-NOT K-D2 IEPOOTIOs HEMOVE FOR FOEL illiiiTANK ACCESS IIIII pF-6Ul II 04A IRE ORR IN PkASYIC ISO 121 SODA BALSA F-R 1540KF-fl T I-P/KS/IS PLYWOND Fl-Ia 3 I/2T ____ 2-I/H L 1/2 3-I/O 3/sO WOSIC WISE -1/1K PLYWOOR - R 156 50 040K lOSSO 1OYEW MWSOWER IAFTER UFE OP WITH 15K SQ BRASSASH TO SHAPE TUBENOTE RUBBERS AWE 0*EL A2EAEJaLI I42AALKZ2RN 125 50 BRASS _____I/U BALSA SHEETTUBE SHER MW HODDEK ISOFTISOLDEK - 'I/IHPLTWOOO I/H LITE PLY SPOCEKS 3/32 BALSA-NBLENO 3/32 I-D4 AlASHEET7AT WATER 2 TI -.LL/TUPTYHO FOR B52 NYLONFS SCREW 121 STABILIZEHi~ -1/1K PLYWOHO LS LITE PLY NOTE AFT EWAIRE COWL IS USHT WEIGUT- LAYER H DO LOATH PLUS LAYER 2 02 OLSON AFT EWAINE 500k ALL BATEHIAL MEDIUM BALSA ARLESS SPECIFIED OTHER Sb WC HID CANOPY RE-WORKEOI niN - FRAY F-7"HATCH BALSAII F-00F-B STOCK vzziU ALL LYBx 3/4I --. SOFT BALSA FILL F-HTIWVOKD/B.-24T1 ALSAI________ __________________-N I/ZBALSA F-Il 01 "CLuRK FOG THI-STOCK .----Io --STABILIZ VL SOALSOWALSA I/BBRLSA R-BLOCK SHEET I/O BALSA THI-STOCKF-6ALS PLC T AID- H HEOKIHEB~----4-40 BOLT-REROOC HEAD OR 1/H LITE PLY PLY N ESOAKS/AF-90TH 00 BALSA BALSABASIC WIRE IEf7iLSOFT BALSA PLYCLUMP N SLOE FILL --1SPECIFICAT IONS - SECT A SAWS WING SPUN HO COT OOT AFTER/550 AREA SQ 14 3/52 BALSA SHEETZNZATTASH AFT-PLYWOWOWEISHY IFUELEDI 9 LSC HDZ ASSES BLY IW PLYMAKE 2WISH LSAOINU OZ AIRFOIL.IH 7 SERI-SYM 34K BALSA SHEET L/$3JWITB WASHOUT POWER TWO 00 ENOIRED F-IaF- IF-S-HATCH2-CYCLE TeNUE F-H BLITE PLY 121 MODEL AVIATION PUSH-PULL 240 TWIN ENGINE R/C MODEL DESIGNED BY AL MASTERS TRACING BY JOE DEMARCO sanded correct outline cut apart finished components should include drawn centerlines aid lineup during sembly Cut lightening holes F12 af ter separating F13 Glue six con struction aids F12 Make preformed 3A2 balsa skin aft fuselage section will need some household ammonia cardboard tube approximately three-inch diameter core tube Christmas wrapping paper works fine Left The wing panel begins take shape has turned over show construction tabs Above bare bones horizontal tall show lightweight structure Because engine vi bration1 must rugged conventional model April 1989 29 upper rudder fitted square brass tube assembles lower rud der tall wheel hatch offers easy ac cess fuel tank supplying aft engine Wheel pants cut 1-in balsa block reinforced 1/-in birch ply carve nice streamline shape ex tra drag helps slow model down during landing model twin has frontal drag single-engine model finished nose cowl foam plug roughed-out aft cowl plug aft cowl can omitted front cowl adds 4 oz much needed nose weight lightweight aft engine mount used help get right CG Select two 7-in lengths /32 sheet 6-in-wide stock Trim balsa 5in width soak ammonia STABILIZERS/B SO BALSA LEADING LEFT STABILIZER STARRI PA CITE PLY BEFORE I/B lI/A BALSA~OsA SEE SHEET RIBS ORE OBOESTRISTOCK VBx I/A BALSA RIB SUPPORT I2OBALS S/IHZ I/OFiLL BALSAJ 7BABORT3OBI/OSA HOBOij BALSA SPAR CSCRAP BALSA 01 I/Bx I/O BIB SUPTS015 ALA /1/ AOR PETLOWER SURFASE INSET / 3/0 SOFT BALSA SHEET S/TOZZRALSASHLfl IBS-SAEETI NOT SBOSAN OR LEFT / ROSA SARIS1/5 50 OARS 3/32 SCRAPTA CONTOURBALSA BALSA RIBSvO BALSA SHEET BATE TRIAL FIT STAR TO VFOSELAAE BEFORE ATTACRIRS VA SO BALSA I FILLELEV-STAB SECTI LVI I/A BALSA I COVERING STAB IIAVA SCREAj~ PUT 7ORILL FOR ipL5/32 B BI I/A BALSA LEASISS OIS ALUMEASEy 0/01122n-p-iiBALSA /_____UWING ____ I_ ~1I _____ PLAN TOP VIEW _______I BALSASBIItZ BALSA 5/52 BALSAI I/B xl BALSA LE3/Az OBEET RIRIO V4x S/B I/B I/O BALSABALSA SOB LEABISA EPSEI/H BALSA2 RISER 5PM SHEETWITHOUT CAP S/SO RALSAVA 120BALSA WISE SHEETINGSPARS 5/52 BALSA least five minutes Blot wood pa per towel wrap around tube using masking tape hold place Set balsa skin aside allow air dry thor oughly Save ammonia another proj ect Begin assembling fuselage over top view plan Support sides up right glue firewall place using F5 spacer Use white glue since will allow time lining everything up Place weight such ordinary brick top front edges fuselage sides clamp FW place pull aft fuselage section together time lower fuselage line forward F5 straight weight will keep setup square work surface until glue sets Attach FR using white glue 10-minute epoxy aid clamp Hold sides together attach F6 cyanoac rylate CyA Add two 14 x %-in crosspieces fit Fl 1 Check position WINO L DIHEDRAL DETAIL NOT SCALE F5 tack CyA Make relief notches Fl clear blind nuts back side FW Force Fl position will aid correcting misalignment front firewall F5 attach CyA Install /6 x A-in hardwood servo rails make servo tray A-in ply fit After gluing F3 place set fuselage asideyoull com pleting laterand proceed wing Wing Trace cut set ribs using pattern make second set Fin ish sand ribs pairs draw chord lines shown both sides rib Cut dihedral braces draw two centerlines indicated both sides leading edge brace Cover wing plan wax paper plastic film before pro ceeding Cut four straight x A-in balsa spars length point weigh four pieces distribute spars avoid using LS 1122 SUB LEAGIRS EDGE 30 Model Aviation Due heavy side loads engine weight necessary use birch ply hardwood lower tail post system Note soldered upper lower torque rods Full-Size Plans Available Page 188 I/B BALSA REMOVE FOR SERVOSMEET IFI 2 Q1 — U AILERON SERVO-L SOFO RULVA- 01 LI lb 0I RALSA OREET IOFT ALSA SO EDGE S/IA DIA DOWELS WINO SOLO SOWN I] NOTE BIBS 2 TRRU 12 ABE 5/32 BALSA SHEET 3 [I 45678910II12 111 II r I OR BALSA SHEET WISH YIP FRAMES I/R PLVWDODV UPPERI/R PLYWOOD_______ I/R LITE PLO1QWiR t __ LEADING EDGE VA PLYWOOD S/DO RALSA SHEET TVP H BOVVOMjSERVO DOONYDIHEDRABRACESWING TIP DETAIL HAL NA S/HI/O /0 BALSA1II______ 71 FILLHOII WINO BOLT PLY4 ACCESS I/O BALSA SUBEE -PUSHPULL 240 3/BR I/O OIL STOCHL --TWIN ENGINE R/C MODEL RI LIGHTENINS ROLES ISV BTA FUSELAGEI/IS BALSA SHEETDESIGNED BY AL MASTERS SIDEBATH SIDESWORK SURFACE I254NTRACING BY OE DEMARCO IIIII ALL RIGHTS RESERVED FILL ISO MUSIC IKE EPOOVI / I/B BRASS TUBE EPOXY TO OK aileron servo carried well forward wing Z-bends A-ln music wire pushrods used connect servo Arm II I-V117j4I TRI-STOCEILIli-TiI #~p Iftv 11-----S I/B LIVEF4[~SRWVAII DLV April 1989 31 receiver battery pack three servos nestled lower nose section below 12oz front fuel tank dual take-offs 5-26 servo controls throttles both engines Left Both K&B 40 05 4OFP have used tor tne aft engine witn equal success Lite Ply spacers firewall provide clearance Tatone manifold Right fuel tank nose compartment sealed keep fuel leaking electronics below two heaviest same wing panel postal scale coding used Glue lower ply dihedral brace spar halves position spar over plan securing pins weights Position ribs 1 through 12 spar making sure construction tabs resting work surface x %-in trailing edge x /2-in leading edge pinned place ribs aid lineup space between ribs 1 2 pro vides leading edge brace will slipped later After making sure ribs perpen dicular work surface CyA ribs spar leading edge trailing edge Fit upper spar glue place Block sand upper surface trailing edge slightly follow rib contours Select four sheets %2 balsa 2-in stock upper lower trailing edge skins Check weights using two heaviest opposite panels Hold metal yardstick edgewise across ribs board sheet edge certain sheet line will straight attached ribs high rib can carefully sanded down dont worry about low rib point Turn wing over Using piece wood such ruler press wing down ward contact %2 sheet bond ribs CyA Work about three ribs time starting rib 1 skipping low ribs Maintaining straight sheet line out waves important gluing rib chip A-in triangle stock can used support skin low rib cap strips added later will hide multi tude construction errors Build wing tip attach rib 12 Center tip rib chord line leading edge 4 x %-in trailing edge balsa filler trailing edge tip will allow block sanding fit con tours %2 sheet aileron Attach tip webs will final sanded after rib caps place Add four hinge supports vertical-grain %2 spar webs between ribs 3 12 Fit rib iF place panel inch off work surface rib 12 set iF perpendicular work surface glue trailing edge spar notch tack gluing leading edge Note iF shown actual length plan reaches leading edge strip Allow space spar notches fit dihedral brace mating spars later Set panel aside construct oppo site panel similar manner completed second panel work surface fit two panels together El evate first panel 2 per draw ing push lower spars together until butt Slightly bevel spar end ob tain good fit upper dihedral brace slipped alongside upper spars clamped using least two clamps side wing centerline Make sure %-in dihedral brace fits flush slightly below spars sanding down later will difficult Add leading edge ply brace clamping same manner Rib iF will have razor sawed shorter Make sure horizontal centerline leading edge di hedral brace located correctly ribs 1 2 both panels bottom edge of servo mount sec Continued page 34 32 Model Aviation finished model resting authors balancing rack Location correct cxi shoula always determined model before making first trip out flying field idea RC Push-Pull 240 came WW Ii Dornier-335 Reported worlds fastest propeller-driven aircraft its time war ended before could made operational youve ever fuel tank split leak fuel fuselage know important install tank can trust Du-Bro Products manufactures complete line rugged polypropylene tanks 10 convenient sizes 2oz 24 oz guaranteed life against splitting leaking money back tank comes complete soft brass tubing hardware Protruding front lip prevents fuel lines being crimped hard landings Single twin vent design gas conversion stopper available use tank gasoline Cat No 400 Visit local Hobby Shop fuel hook up accessories can Cap Fittings In-Line Fuel Filter 0 Fuel Tubing Kwik Fill Fuel Value Gas Gb Fuel Tank Filter KwkF Fue Pump tion should parallel work sur face wing level upper spar leading edge clamped rear section wing panels butted trailing edge make final check spars run straight tip tip Hit ar eas CyA Carefully turn wing over clamp lower dihedral brace two clamps CyA Add four 3A-in triangle braces ribs 1 2 Complete center section shear webbing cut off con struction tabs Add balsa filler blocks trailing edge bays between ribs 1 iF Carve notch bottom iF accept W2 Install latter gluing flush bottom rib 1 Remove section iF accommodate aileron servo location Wl can shifted neces sary allow space aileron servo stall Wi add A-in triangles support W2 upper lower leading edge sheets attached /16 overhang leadmg edges Wetting outside surface sheets will make forming easier sheet edges will block sanded until leading edge provide flat gluing surface x 1-in leading edge cap Fasten -in -thick scrap spacer along leading edge masking tape Place wing fuselage check saddle area fit Remove wing epoxy hardwood hold-down blocks place temporary x -in cross brace glued near blocks fuselage side support epoxy has cured align wing fuselage hold place masking tape Drill through W2 hardwood blocks Y6 bit held perpen dicular W2 Remove wing re drill W2 A-in bit Tap blocks A-20 wing bolts Bolt wing place drill two s through F5 leading edge Wi Trial fit two /, dowels shown plan Use soft balsa foam filler around the wing bolt holes sanding down center section top sheeting Remove dowls complete wing sheeting rib caps leading edge cap Drill through leading edge cap /16 bit two dowels epoxied after wing has covered Ailerons Cut two aileron cores 3/ x 1-in aileron stock After making lightening holes cover ailerons /l6 sheet balsa Drill four holes hinge pins 1-in bit drill %2 hole torque rod Transfer hinge locations wing drill Trial fit ailerons hinge pins /2 torque rod assemblies alignment correct epoxy brass tubes onto wing trailing edge Remove ailerons final sanding covering Fuselage-wing assembly rmal fuse lage construction Razor saw two slots 34 Model Aviation top F5 sand accept wing dowels make /6 drilled holes oversized dowels inserted bolt wing place Lay small piece wood across top dowels trace its lower edge line location F5 Move down /16 below line just made fit piece A-in ply between dowel holes epoxy F5 Epoxy 3A-in triangle brace under ply Drill /16 hole center through ply tap A-20 bolt Treat hole CyA A-in ply wing hold-down has A-in drilled hole see drawing detail Cut two fuselage trim pieces / x % x 15 long medium-hard balsa Glue top FS extend yond FR about 4 dont glue beyond F7 Make /16 notch trim piece allow pulled together slightly behind FR secured rub berband tape Slip piece wax paper between FR FlO clamp FlO FR Glue FlO trim pieces being careful bond latter FS Cut piece x M-in balsa width F7A Add /16 ply top drill 140 hole #27 bit shown Glue x s-in piece top trim piec es F7 Glue F7A top crosspiece after fitting over /16 ply stall 1 A-in-long 6-32 socket-head bolt washer through 140 hole Use small piece tape keep bolt fall ing out Trim section preformed %2 skin fit between F7 FR overlapping both slight ly Sand bottom edges theyre alignment top trim pieces mate F7A FlO CyA skin trim pieces Aft hatch Razor saw remove aft ex tensions trim pieces cut through F7 Remove hatch section com plete application CyA F7A FlO piece plastic soda straw epoxied place will keep 6-32 bolt trapped Sand %2 skin flush F7A Install F8 F9 through slots cut formed skin Small pieces triangle stock add final rigidity unit Complete hatch front hold-down placing piece /16 ply 6-32 blind nut under two x 3A-in fuselage crosspieces Line up hatch snug up 632 bolt Use Du-Bro ball wrench inserted through small hole skin CyA ply place remove hatch epoxy ply cross members two /16 ply aft hold-down tongues installed follows Shave off excess material inside hatch trim piec es 6-32 bolt masking tape rear holding hatch place work through opening fuselage bottom Position ply tongues tack CyA F9 %2 sheet bond FS Remove hatch ep oxy tongues Again bolt hatch secure Continued page 136 EffectiveJanuary 1989 Fox motors except Combat supplied muffien some time have using soft sell approach columns customers direct some excerpts letters have received Eric larson Pine Grove CA Fox Mfq Yesterday bought Fox 4OBB Delux thefirst Fox engine have owned some apprehension bought anything other OS engine have burned before buying off brand engines Today am convened Fox 40 40SF similar both start idle magnfkenrly cant tell dfference power thats similarities end Fox 40 vibrates less easier adjust lighter comes great spinner costs hoff much American made hove now made sure everyone myflying club knovs what great buy Fox engines THANK YOU FOR QUALITY PRODUCT Eric Branham Paris IL r purchasing 40 Delux year lam impressed performs exceptional lot better OS Are planning replace Eagle III update 60 size will assured will first line purchase Jon Armitage Indiana PA ed send letter praise about motors motors used flew C/L FE started RC about year ago decided try Super Tiger 25 0S4 Stroke 40 good came bock Fox power quality handling allot decent price engines popular field Will Sgarlat Cape Cod MA note tbonksfor youve donefor wonde4izl hobby yourflne engines Dukes Mixture column temfic service offer us accidentally smash up Fox engines beyond what theyd care tackle repair Westley Keller Gouster OH have meaning drop linefor some time 40 motor trouble replaced put icing cake will never run anything planes unless says Fox side performance service says subject Decals present time am running 8 Fox engines am requesting Decals accordingly Alse lam lookingforsvard coming Eagle 4 Keep going best engines world Barry Doughty Absecon NJ placed old OS Max 60 Clipped Wing Cub Top Elite new Fox SOBA WOW what engine no vibration started right out box no adjustments Idled good accelerarionfrom idle full bock reenfic Weight bigfactor purchasing SOBBRC lighter OS SuperTigre Come etc Also must add replacement parts economical foreign imports Coming landing motor idled down beautifully settled infor great landing Again engine something else loads power very easy onfuelfor SO size engine John Holder Ob Seeverson AL ne obviously drfective else would have pulled wings off Aerostor 40 Seriously very pleased myfirse Fox engine Vaughn Kempf Modern Hobbies Miles City MI wanted take afew minutes send afew wards praise way talked three customers buying Fox 4OBB Delux motors quite impressed motors have couple observations pass along First havefound performancefigures seem little conservative modest measuring 14000 plus Master Airscrew 10 x 6 props using Royol Pro Tachfor readings Idle lower other 40 Ive ever ron realiable during spins soaps inverted idling Kenneth Wilson Schenectady NY know lam loyal satisfied Fox engine user over years Ive owned U/C 36 Fox R/C engines such Fox 2S early Fox 40 Eagle III currently own 2 Eagle Ills must compliment quality value youve designed built Fox engines Corey Wills Perryville MO compliment having thefinest engines made Several myfriends have flying Fosfor past three orfour years wouldnt give up other engine somewhat higher prices lately still cant beat affordability reliability performance Doc Matthess Wichita KS drop note express pleasure over engine Fox 45 Excellent midrange easy start set super neat spinner set up andfinally sofe incredible power larry Maltman Winnipeg Canada k kindlyfor promptly courteouslyfilling last order appreriate excellent service seems todays hurried ways few businesses take time what just seemed naturalfor Fox Mfg Ca have active builder/flyer since 1962 Myflest Fox engine reliable durable lam also happy state additional 17 Fox engines have purchased since 1962 running reliably consistently lester Goldsmith Action Hobbies Memphis IN riting tell Fox 60 Heli Engine has cranked run flawlessly rightfrom start Enclosed pictures Schluter Scout 60 1 did test run engine before installing believe really necessary because just cranked Fox 45 Heli today new unrun except byyourfacroryj new Schluter Junior though test run too cronked ran immediately idled perfectly very smooth believe word getting around Fox best buys now because compression al ways good making starting good power output always above average tops confirmed test articles magazines Life always goad because appear cut corners importantfeatures such bushed conn rods grades material Ruts always hand tap factory service unmatched anysvhere Eugene Mathis Daphne AL Fox 4OBB out Clubfleld last Saturday kicked tires lit thefires took off leaned bit andflight number twa went whole tank really started come Flight 3 very spectacular pulling vertical stall turn Ifinally throttle off hung prop just kept going veritable hoss because Kaos 40 weighs ran Walter Pawlukanis Oakhurst NJ normally write manufacturers anyone else asfar goes matter offact cant remember wrote last However am really impressed Fox 4OBB Delux WOW what engine have mounted 40 size Ugly Stik type airplane about 2-1/2 gals offuel through irsofar Eyes popping started right up required some hi 5 peed adjustment Since until now has gotten better better Vertical performance just doesnt quit ttle response certain sure Im willing wager bet money its certainty AlMancini las Angeles CA te thank youfor incredibly fast turn around phone order Onward Upward Andy Keeley Memphis IN ht Eagle III put 6-1/2 pound airplane next day flyingfield great airplane vertical performance needed Thank great engine also like Dukes Mixture Model Airplane News Happy Flying Manufacturing Company 5305 Towson Avenue Fort Smith AR 72901 Phone 501 646-1856 April 1989 35 Freebees available time new color catalog new price sheets parts sheersfor 1988 1989 model motors wauld appreciate receiving seffaddressed envelape twa stamps however masking tape rear Drill through sides tongues #29 bit 136 tap 8-32 nylon screws Replace fit hatch Sand Y32 skin flush FR Fit forward section formed sheet glue place hatch place shave sand trim pieces shape F6 aft FS Cowls nose cowl adds needed weight attaining correct center-of-gravity aft cowl merely cosmetic lost foam method can used make fi berglass cowls Styrofoam forms made undersized allow cowl wall thick ness Use batches Hobbypoxy 2 four layers 6-oz cloth strips nose cowl aft cowl takes layer same size strips Add final layer 2oz cloth both units After epoxy has set gouge out foam use acetone remove resi due ply cowl mounts installed last epoxy strips fiberglass cloth nose cowl should have final weight 4 oz Use hex ball-driver reach hid den socket-head bolts use extended sides FS shaped balsa blocks instead glass nose cowl may need add nose weight correct centerofgravity Empennage Its important build sta bilizer light strong aft engine right trying shake apart Build main frame flat over plan protected wax paper Notch tip pieces R-in-sq hard balsa spar Add 10 rib supports hinge blocks Dont forget A6 ply trailing edge doubler Trial fit frame fuselage Posi tion A-in-sq balsa inboard ribs hug fuselage sides sanding ribs ap propriate contour procedure allows unit covered prior attachment fuselage Add remaining ribs fit four A-in vertical-grain braces will epoxied place after stabilizer has covered attached Assemble elevators /I6 dowel block sand shape 015 alumi num support formed around dowel Build upper lower fins associated rudders upper rudder has groove its lower edge accept Y32 wire torque rod Fit upper fin place over F8 F9 lower fin tail post A-in birch ply predrilled A-in bit hinge point Make lower fin including /16 ply bearing piece %2-in hole lower torque rod trailing edge fin clamped glued after hard wood block formed tail wheel wire has glued place Add soft balsa filler set aside Rudder torque rods make upper torque rod start cutting two pieces % music wire making 2 sec ond 4/2 long Make 900 bend 1 end Solder -in sec tion K&S 125-in-sq brass tubing its end 3A-in leg Allow no solder outside brass part Tinning wire first sweat ing brass wire makes nice neat job Make upper torque rod Solder /2in piece 125-in-sq brass tubing onto end 1-in leg 2%-in piece 156-in-sq brass tubing slipped over 125 tubing ered Lay upper lower torque reds flat board relative positions Assem ble lower tube upper tube telescope mating parts one-fourth inch Tackle upper wire assembly soldering iron remelting upper joints applying very light pressure both 900 arms resting flat sur face arms will now lined up parts assembled specified before remelting lineup risk fusing whole assembly making un usable Telescope two parts checking ease fit dimensions Assembling covering Finish fuse136 Model Aviation ELECTRIC SEMI-SCALE Radio Control Sport/Trainer Wing Span 67 3/4 Length 37 1/2 EIII see Local DeCirn PAUL K GUILLOW INC WAKEFIELD MA 01880 Push-Pull/Masters Continued page 35 lage assembly fitting top batch canopy area sealing front fuel tank area epoxy Fl P2 provide fueltight compartment protect electronics carried below Assemble controls sup porting necessary Add triangle stock close up compartment F13 Cut lower hatch provide retaining Attach Halco strut four 4-20 aluminum bolts plastic nuts wheel pants sawed 4 x 12-in balsa block thick Reinforce A-in birch ply Resist tempta tion carve sand wheel pants nice streamlined shape need cer tain heft order contribute drag land ing time Remember although two engines idle frontal drag area single engine After final sanding vacuuming free dust cover individual parts favor ite material Coat both firewalls epoxy inside out covering stabilizer leave bottom center section open Position stab attach CyA checking align ment carefully Pass lower torque rod through /I6 ply bearing Fit lower fin slot F12 clamp lower tail post A-in Lite Ply fuselage cross brace Square up epoxy fm leading edge inside fuselage Attach A-in ply lower tail post A-in Lite Ply cross brace using CyA Glue four vertical-grain A-in braces stabi lizer fuselage sides Close up stab center section Push lower rudder over torque rod epoxied hinge point Make sure treat center hinge point pe troleum jelly expect hinge action af ter epoxy cures Angle upper torque rod position through its ply bearing join two torque rods Fit aft hatch place bolt Assemble upper rudder its hinge point Line up two rudders epoxy upper torque rod groove bottom rudder Install elevators attach 015in aluminum support aft firewall two No 2 screws Secure tail wheel tiller loop lower rudder small rubberband bound tightly possible tail wheel off set rudder pushrod undersize minimize servo shock engines place pipe up fuel systems using pressure both Use Hig ley Heavy Hub Master Airscrew 10-6 prop up front lighter Zinger 10-6 wood pusher prop rear combina tion will give extra 3 oz up front counts Install electronics feeding anten nae back through upper lightening holes snaking out three holes left side just above stabilizer Flying single servo controls both throt tIes using Du-Bro EZ connector ca ble arrangement servo throttle linkage can independently adjusted Set front engine reliable idle high-trim position Low trim should cut engine Kill front engine set up aft engine same manner Setting up engines manner makes unlikely both can cut off precisely same time However pre sents no problem since engine should fail final approach go-around single engine readily made desired Its unnec essary synchronize engines just have both running well Its important aft fuel tank car ried high possible within tail sec tion use piece l-in-thick foam under tank Since engine pusher configu ration does have rain carburetor air tank location relation needle valve critical order avoid early starvation fuel level lowers small sheet metal scoop attached direct rain air carburetor throat Although worked ef ficiently carrying tank higher much less trouble equally effective Keep simple Note also rear tank clunk stalled forward position Having used clunk pickup both directions pushers Ive found forward installa tion satisfactory requires much less fuel line As aircraft having pusher propel lers special precautions must observed prevent debris going through Continued page 141 April 1989 137 1t I] iyu 111 E1ii RE SHOOTING DOWN HIGH BALSA PRICES WITH SUPER QUALITY Satisfaction Guaranteed Direct Only BALSA SHEETS 36 48 30 BALSA STICKS 3648 16233 332240 18243 316249 14256 132337 20337 163374931 33234458 37 1835471 45 31636282 55 14373 95 61 516395110 38355124 71 123110155 34 3165191 116455 7648 332470 9456 18 48010666 316493122 75 14411013484 38 4165225139 12 4225261 MATCHED SHEETS 42 3324100 164109 3164120 144131 116 14 116 36 116 12 332 14 332 35 332 12 18 18 18 14 18 36 18 12 316316 316 38 316 12 14 14 14 30 412 14 34 141 516516 3838 3812 3634 381 1212 1234 121 58 55 34 34 Os 10 14 10 12 16 08 11 12 18 11 17 22 16 19 21 34 40 21 27 32 42 52 36 46 56 48 67 16 18 24 16 20 30 24 26 30 44 55 28 37 46 55 70 53 62 78 66 90 BALSA HOT LINE Call 806 745 6394 10am 6pm Central Time BALSA TRIANOL ES 36 25 8830 35 45 55 BALSA PLANKS36 86 0 00 1480 1123275 1124360 22225 23325 24435 33495 34668 TAPERED SHEETS36 142 65 143 65 382 83 23120 LONE STAREPOXY 90L sI--S 95 5so598 iSoro598 38 rro598 CUSTOM CUT CONTEST BALSA Sheets Piece ed Close Tolerances AAA Grade Dried ped 100% a serious modeler want performance must try 4-6 lb balsa LIGHT 4-6 LB WOOD 1 32 3 1/203 1163 332 3 183 3 163 143 383 123 343 13 1 164 3 324 184 3164 144 384 124 36 53 53 53 63 77 89 104 122 158 242 335 83 100 115 133 158 236 322 TRAILING EDGE 36 14132 51611439 3811246 12270 INSTANTOLUE 1 o TSck 298 10 750 298 20 T5ck 550 20 150 550 BASSWOOD 316316 31614 31638 31612 31634 1414 1438 1434 3838 3/812 3634 12 1 2 1234 BUNDLE DEALS 28116336695 201164361035 20332 336865 15332 436955 151/8336738 101/8436895 15318336920 10316436835 1014336655 101/4436830 103/8336870 53/84 36655 51/2336540 5124361580 10-3324 48885 518448500 5316 4 48600 514448645 48*NEW* 26Hundreds 30 38 46 cessories 60 ishing 42 materials 80 60 #10 SASE 70 atest 90 catalog 100SPRUCE STICKS 3648 18 181725 18 142026 18 3/822 32 316316 28 38 14 3/84055 14 124585 3/8 3/84969 38 126577 12 I/O6688 12347597 SPRUCE TRIANGLES 38 38 12 1 2 34 34 1846 18412 146 HARD MAPLE 1 4 36 3838 38 12 3834 1 2 IRCH DOWELS 18 316 14 516 38 18 40 45 50 58 68 36 09 11 14 25 32 3PiVBIRCH48 16412620 13212445 11612455 1812485 SPLVBIRCH 48 33212588 1/812 625 36316 12625 4714 12828 8438 12725 8112 12900 LITE PLY 48GROOVED LGMOUNTS lllachea 15538341840 3153834/532140 2501234916/45 495 V. Push-Pull/Masters Continued page 137 prop author owned full-scale Lake Amphibian pusher years found protecting propeller loose nuts bolts fishing rods always major concern twin engine push-pull arrangement especially vulner able front prop can kick up stones starter cables wiping cloths etc promptly present rear prop digestion Flying twin pusher also requires special watchfulness flight Push-Pull 240 near-fiasco Immediately after takeoff carburetor aft engine came loose moved pusher prop promptly seif-destructed en gine full bore extremely unbalanced tore itself firewallbefore fuel starvation saved day whole scenario lasted about three four seconds pilot Ray Doan brought ship back single engine thorough preflight check would have spared pusher prop main thing remember get Push-Pull smoothly aloft advance throttles steadily during takeoff Ground control will positive no torque cor rection required Clinibout will solid watch slice through ether sound twin 40s something else Radio Technique/Myers Continued page 37 RC34 through RC37 vice versa 2 next condition change comes out mathematics frequencies coo Image interfer ence will return few SC455s Some folks will remember 7296 Y/W used image 7208 Bn/W Well SC455s RCll-14 RC57-60 can af fected Tx within band have local oscillator wrong side assume manufacturers simply wont sell SC455s channels Besides image coincides exactly Common Car rier Tx frequencies RC Tx helps Rx low LO have possibility imaging TV4 RC44 problem know love So see nothing simple cure above simple Use dual conversion Rx entry-level RC system almost always uses SC455 manufacturers will have narrow-band pay attention proper LO signments keep off RCll 12 13 14 34 35 36 37 57 58 59 60 Jim didnt mention channel doubt above manufacturers just arent selling Indirect Interference condition comes out numbers called Second Order Intermodulation Product Interfer ence 21M generated ANY PAIR Tx operating 23 RC channel numbers apart difference two frequencies modu lated 460 kHz signal often goes right through 5C455 detected interference Think 21M generated JUST ONE PAIR Tx might hit OWBAM SC45Ss SO channels simultaneously including own Rx depending signal strength Rx tenna RECEIVER CHARACTERIS TICS Nobody uses odd-numbered RC chan nels RCll 13 15 today dont see 21M Can predict what will happen give 25 odd-numbered channels another service Now remember discussing RE CEIVER problems assumption everyone already using Gold-stickered narrowband transmitters Practically Tx built since 1987 good enough warrant sticker easiest way avoid problems listed above use dual-conversion receiver dont have block out ANY channels Jim manufacturer offers best dual-conversion receivers market relatively cheap recommend letter appropriate person named end last months column narrow-band 5C455 can work cause interferences discussed above z off 455 kHz intermediate frequency IF dead like 31M Narrow-band SC455s exist example Bob Aberle recently tested Polks Pow ermax Merlin system receiver 5C455 RC46 its LO low side An IF bandwidth 6 dB 2 kllz claimed nothing quoted 85 kHz Merlin performance meets AMA guide lines except ins LO wrong side does use dual conversion DC outper formed 1991 DC system have tested ex cept its PCM computer slow April 1989 141 LONE STAR MODELS1412 1623 S7th St Lubbock TX 79412 cant 46 Handling charge pay UPS Add $250 COD $300 extra PP APO FPO StateS accept Vs4 Master Card personal checks COO 6% 368/n TenaS US crrency Mnmom Wood Order 51000
Edition: Model Aviation - 1989/04
Page Numbers: 24, 25, 26, 27, 28, 29, 30, 31, 32, 34, 35, 136, 137, 141
NO OCR TEXT NO OCR TEXT Left aft hatch hides 6-oz fuel tank tar rear engine natchlfin unit rejainca wuin trappea o-a aovw-neea oumi ana iwo O-J nylon screws Right Removing front hatch reveals plywood keeper holding two wing dowels place Under Sig canopy Williams Bros pilot ready go wing bolt covers made aluminum cigar wrappers have painted match Left simple onset tail wheel tiller lessens servo shock during ground operations Right Fiberglass cowls nice addition model difficult make 4-oz weight nose cowl helps balance aft cowl may omitted desired Fuselage Use piece A-in Lite Ply 12 wide 48 long Determine whether want separate fiberglass nose cowl built-up front engine compartment opt built-up style add 4 part labeled PS front FW plan Placing Lite Ply under fuselage side view locate end points straight lines pin pressed ply Con nect points using ball-point pen Hav ing basic lines straight makes easy work drawing sides curved sec tion wing saddle can traced few pieces carbon paper slipped between plan plywood Cut out PS sand down lines shown plan Trace second side first cutting sanding outline Clamp two sides togetheror socket-head bolts attachIng cowls can reached hex ball-driver hold together small pieces masking tapewhile block sand identical size errors tracing inevi table Make sure edges square 6 x 12-in piece /16 birch ply used nose doublers F4 Use FS template Make cutout section gear mount P3 Apply very thin coat 30-minute epoxy doubler P4 position FS making sure allow firewall FW Use weights clamps until ep oxy sets Make right left fuselage side asme Haico B106-8 strut Du-Bro axle K&S 062 aluminum clip hold rugged plywood-reinforced wheel pants place sembling its respective birch nose doubler Make two aft doublers Fl 1 attach thin layer epoxy Allow correct spacing aft fire wall FR two small doublers F6 can also attached using white glue suggested sides resanded en sure upper lower edges true identical sides placed inside surface faces up carefully draw locations Fl F2 F5 F6 F7 Make firewall FW laminating A-in birch ply Cut FR X6-in birch ply Draw horizontal vertical thrust lines both sides firewall will using engines different makes pick heaviest tractor front unit engine including muf 26 Model Aviation DESIGNED BY AL MASTERS IG WC 813 CRrJOPY FI0ERGLR ccWL--pwORKW OP&BOJTOM 3A6LA GOLD8ER%RLBR_ \\ /axBf4L N / 2 _____ NGL016 pIY IV 13~gW 3/ 15 pUI y8%Y I3R$A Qj 4EET 1~ 4 C ~RVY 2 Weigh wing spars determine two heaviest Place 01 heavy spars right panel other left fler attached its mount position firewall canting counterclockwise see front view Hold thrust line indicated allow muffler clearance proper carburetor location respect fuel tank Mark drill firewall stall four 6-32 blind nuts three tend use fiberglass cowl back side aft engine side mounted exhaust down standard mount such Dave Brown 4045 can used light weight variety shown plans engine should placed close FR possible still allowing clearance Tatone EM 4Oss manifold Lite Ply spac ers can used between FR mount mount arms longer neces NOTE FRONT ENUINE INSTALLATION-TUT CHORE FOR CORRECT LOCATiON OF EARNURETOR IN RELATION TO FUEL TANR ATTACM MOUNT TO FERWALL WETTI FOUR 14-32 T-MJTS N BOLTS LOWER MATCR CR LITE PLYF13 1-1 II lOOT UTE PLYII MUFPLER LUCATIONfl I504 RALSA TRISTUCO I/S PLY 4.BOTCH FUR MAPLE MOCR IIIII I/U RALSA TRI-OSUCI I/O PLTiiAjTj I ICONSTRUCTION 010 iT - - NOTE SERVO SHOWN FROMLM PLY SERVO TRAY ELEVATOR AILERONS IRUODEU I/O PLY WOOD I/H PLT IHEMUVAMLEI 6 ~ITEj I/lU PLYPUPLY WITH F-IS I/O CITE PLYHI/lU PLY14-02 TNUT 0101EV HEAVY---2~ ATCH -- OUR IOUZI -UIIBUZI AU TWO-CYCLEFAIrSUORO S-b TUSOIOU MALSA--H \iiiEAGNEII-V TUCKI IF BALANCE IFUAMI SERVO04 L PLY WITHOUT I 1CUSYRUL MASTER AIRSCSEYR 0-14RATT LYSUPPORT GOLORERO 2 SONNER\V- 0-SO ECE1YLR 11400 EI51 TROT--I IFLUM001CR VUNISE HEAVY WALL FIREROLASS COWLP13 IA PRAX 4 00 COMPLEVEUTE PLYHATCH HALCO BlUR-UI/H -005/4 ALUM ROLl 002 005 ALUMLASOINO SEAM H OTLUS SLYTIVI LANOINO OEAR CLIPLIURTEN RAND TU FIT/ ER PLYWOOD- I/O PLY lBALSAZi4IA OOR LITE ATTOEB WITH 004-40 NUTO BOLT TO.. 145O SERER/NAT EAO _FUSELAGI VI E 000140 040 REMOVE NOT FROM RALCO UEAR TAP FOR 001400 VOLE -GZYS 010 500 04 sary should cropped off save weight Use three 4-40 blind nuts bolts install mount Remove mounts before continuing fuselage con struction Cut remaining fuselage components materials specified Note Fl A-in birch ply includes switch cut out F12 F13 shown actual length plan can traced piece Left Fuselage parts Lite Ply sides bottom conjunction birch ply balsa keep weight distribution under control No tice two pre-formed balsa skin pieces fuselage side dou blers have already glued place Above Completed basic fuselage straight lines design signify easy layout 28 Model Aviation wing ribs Irst cut out witn construc tion tabs left provide easy method building necessary wing washout Full-Size Plans Page 188 F-I2oR LITE PLYAFT ENGINE MOUNT 1/H Lire PLY SPACER ID OH 4 REOHIREBI 141 HOLES TO WATCH L/2BALSAENGINE CASE THFSTOCHI/TDA WALSH -I 052 KS S--ATTACH TO F-fl WITH LS KS/B BALSAALABINOM131 4-40 T-NUTS S BOLTS BLOCK3/8 SOFT BALSA TAP FOR I/O-ZOkS/H 010 FIHEHOLASS COWLSPINNER -I -flE-KAF-Il III iCANOPT- COCKPIT AREA IAIII III I I _ -II __IIIII I I/ZBALSAI OW PL F-Nil I11 ...I II THFSTOCK HATCH TONGUE - I F-ri II 711 UiI i -----ZINOES 10 K Fl/A H-SO RH HALTEPOXYOx 3/4 BALSAPOSHEK PHOP TRAPPED E TOP VIEW EPOOTPSAS SYWAW'\I/B LITE PLY 1/1K PLY--.....WAKE I/H TM-STOCK I 3HBALSA0TRIBTO L~--IF-SROBART DOW F-SL_________IT-NOT K-D2 IEPOOTIOs HEMOVE FOR FOEL illiiiTANK ACCESS IIIII pF-6Ul II 04A IRE ORR IN PkASYIC ISO 121 SODA BALSA F-R 1540KF-fl T I-P/KS/IS PLYWOND Fl-Ia 3 I/2T ____ 2-I/H L 1/2 3-I/O 3/sO WOSIC WISE -1/1K PLYWOOR - R 156 50 040K lOSSO 1OYEW MWSOWER IAFTER UFE OP WITH 15K SQ BRASSASH TO SHAPE TUBENOTE RUBBERS AWE 0*EL A2EAEJaLI I42AALKZ2RN 125 50 BRASS _____I/U BALSA SHEETTUBE SHER MW HODDEK ISOFTISOLDEK - 'I/IHPLTWOOO I/H LITE PLY SPOCEKS 3/32 BALSA-NBLENO 3/32 I-D4 AlASHEET7AT WATER 2 TI -.LL/TUPTYHO FOR B52 NYLONFS SCREW 121 STABILIZEHi~ -1/1K PLYWOHO LS LITE PLY NOTE AFT EWAIRE COWL IS USHT WEIGUT- LAYER H DO LOATH PLUS LAYER 2 02 OLSON AFT EWAINE 500k ALL BATEHIAL MEDIUM BALSA ARLESS SPECIFIED OTHER Sb WC HID CANOPY RE-WORKEOI niN - FRAY F-7"HATCH BALSAII F-00F-B STOCK vzziU ALL LYBx 3/4I --. SOFT BALSA FILL F-HTIWVOKD/B.-24T1 ALSAI________ __________________-N I/ZBALSA F-Il 01 "CLuRK FOG THI-STOCK .----Io --STABILIZ VL SOALSOWALSA I/BBRLSA R-BLOCK SHEET I/O BALSA THI-STOCKF-6ALS PLC T AID- H HEOKIHEB~----4-40 BOLT-REROOC HEAD OR 1/H LITE PLY PLY N ESOAKS/AF-90TH 00 BALSA BALSABASIC WIRE IEf7iLSOFT BALSA PLYCLUMP N SLOE FILL --1SPECIFICAT IONS - SECT A SAWS WING SPUN HO COT OOT AFTER/550 AREA SQ 14 3/52 BALSA SHEETZNZATTASH AFT-PLYWOWOWEISHY IFUELEDI 9 LSC HDZ ASSES BLY IW PLYMAKE 2WISH LSAOINU OZ AIRFOIL.IH 7 SERI-SYM 34K BALSA SHEET L/$3JWITB WASHOUT POWER TWO 00 ENOIRED F-IaF- IF-S-HATCH2-CYCLE TeNUE F-H BLITE PLY 121 MODEL AVIATION PUSH-PULL 240 TWIN ENGINE R/C MODEL DESIGNED BY AL MASTERS TRACING BY JOE DEMARCO sanded correct outline cut apart finished components should include drawn centerlines aid lineup during sembly Cut lightening holes F12 af ter separating F13 Glue six con struction aids F12 Make preformed 3A2 balsa skin aft fuselage section will need some household ammonia cardboard tube approximately three-inch diameter core tube Christmas wrapping paper works fine Left The wing panel begins take shape has turned over show construction tabs Above bare bones horizontal tall show lightweight structure Because engine vi bration1 must rugged conventional model April 1989 29 upper rudder fitted square brass tube assembles lower rud der tall wheel hatch offers easy ac cess fuel tank supplying aft engine Wheel pants cut 1-in balsa block reinforced 1/-in birch ply carve nice streamline shape ex tra drag helps slow model down during landing model twin has frontal drag single-engine model finished nose cowl foam plug roughed-out aft cowl plug aft cowl can omitted front cowl adds 4 oz much needed nose weight lightweight aft engine mount used help get right CG Select two 7-in lengths /32 sheet 6-in-wide stock Trim balsa 5in width soak ammonia STABILIZERS/B SO BALSA LEADING LEFT STABILIZER STARRI PA CITE PLY BEFORE I/B lI/A BALSA~OsA SEE SHEET RIBS ORE OBOESTRISTOCK VBx I/A BALSA RIB SUPPORT I2OBALS S/IHZ I/OFiLL BALSAJ 7BABORT3OBI/OSA HOBOij BALSA SPAR CSCRAP BALSA 01 I/Bx I/O BIB SUPTS015 ALA /1/ AOR PETLOWER SURFASE INSET / 3/0 SOFT BALSA SHEET S/TOZZRALSASHLfl IBS-SAEETI NOT SBOSAN OR LEFT / ROSA SARIS1/5 50 OARS 3/32 SCRAPTA CONTOURBALSA BALSA RIBSvO BALSA SHEET BATE TRIAL FIT STAR TO VFOSELAAE BEFORE ATTACRIRS VA SO BALSA I FILLELEV-STAB SECTI LVI I/A BALSA I COVERING STAB IIAVA SCREAj~ PUT 7ORILL FOR ipL5/32 B BI I/A BALSA LEASISS OIS ALUMEASEy 0/01122n-p-iiBALSA /_____UWING ____ I_ ~1I _____ PLAN TOP VIEW _______I BALSASBIItZ BALSA 5/52 BALSAI I/B xl BALSA LE3/Az OBEET RIRIO V4x S/B I/B I/O BALSABALSA SOB LEABISA EPSEI/H BALSA2 RISER 5PM SHEETWITHOUT CAP S/SO RALSAVA 120BALSA WISE SHEETINGSPARS 5/52 BALSA least five minutes Blot wood pa per towel wrap around tube using masking tape hold place Set balsa skin aside allow air dry thor oughly Save ammonia another proj ect Begin assembling fuselage over top view plan Support sides up right glue firewall place using F5 spacer Use white glue since will allow time lining everything up Place weight such ordinary brick top front edges fuselage sides clamp FW place pull aft fuselage section together time lower fuselage line forward F5 straight weight will keep setup square work surface until glue sets Attach FR using white glue 10-minute epoxy aid clamp Hold sides together attach F6 cyanoac rylate CyA Add two 14 x %-in crosspieces fit Fl 1 Check position WINO L DIHEDRAL DETAIL NOT SCALE F5 tack CyA Make relief notches Fl clear blind nuts back side FW Force Fl position will aid correcting misalignment front firewall F5 attach CyA Install /6 x A-in hardwood servo rails make servo tray A-in ply fit After gluing F3 place set fuselage asideyoull com pleting laterand proceed wing Wing Trace cut set ribs using pattern make second set Fin ish sand ribs pairs draw chord lines shown both sides rib Cut dihedral braces draw two centerlines indicated both sides leading edge brace Cover wing plan wax paper plastic film before pro ceeding Cut four straight x A-in balsa spars length point weigh four pieces distribute spars avoid using LS 1122 SUB LEAGIRS EDGE 30 Model Aviation Due heavy side loads engine weight necessary use birch ply hardwood lower tail post system Note soldered upper lower torque rods Full-Size Plans Available Page 188 I/B BALSA REMOVE FOR SERVOSMEET IFI 2 Q1 — U AILERON SERVO-L SOFO RULVA- 01 LI lb 0I RALSA OREET IOFT ALSA SO EDGE S/IA DIA DOWELS WINO SOLO SOWN I] NOTE BIBS 2 TRRU 12 ABE 5/32 BALSA SHEET 3 [I 45678910II12 111 II r I OR BALSA SHEET WISH YIP FRAMES I/R PLVWDODV UPPERI/R PLYWOOD_______ I/R LITE PLO1QWiR t __ LEADING EDGE VA PLYWOOD S/DO RALSA SHEET TVP H BOVVOMjSERVO DOONYDIHEDRABRACESWING TIP DETAIL HAL NA S/HI/O /0 BALSA1II______ 71 FILLHOII WINO BOLT PLY4 ACCESS I/O BALSA SUBEE -PUSHPULL 240 3/BR I/O OIL STOCHL --TWIN ENGINE R/C MODEL RI LIGHTENINS ROLES ISV BTA FUSELAGEI/IS BALSA SHEETDESIGNED BY AL MASTERS SIDEBATH SIDESWORK SURFACE I254NTRACING BY OE DEMARCO IIIII ALL RIGHTS RESERVED FILL ISO MUSIC IKE EPOOVI / I/B BRASS TUBE EPOXY TO OK aileron servo carried well forward wing Z-bends A-ln music wire pushrods used connect servo Arm II I-V117j4I TRI-STOCEILIli-TiI #~p Iftv 11-----S I/B LIVEF4[~SRWVAII DLV April 1989 31 receiver battery pack three servos nestled lower nose section below 12oz front fuel tank dual take-offs 5-26 servo controls throttles both engines Left Both K&B 40 05 4OFP have used tor tne aft engine witn equal success Lite Ply spacers firewall provide clearance Tatone manifold Right fuel tank nose compartment sealed keep fuel leaking electronics below two heaviest same wing panel postal scale coding used Glue lower ply dihedral brace spar halves position spar over plan securing pins weights Position ribs 1 through 12 spar making sure construction tabs resting work surface x %-in trailing edge x /2-in leading edge pinned place ribs aid lineup space between ribs 1 2 pro vides leading edge brace will slipped later After making sure ribs perpen dicular work surface CyA ribs spar leading edge trailing edge Fit upper spar glue place Block sand upper surface trailing edge slightly follow rib contours Select four sheets %2 balsa 2-in stock upper lower trailing edge skins Check weights using two heaviest opposite panels Hold metal yardstick edgewise across ribs board sheet edge certain sheet line will straight attached ribs high rib can carefully sanded down dont worry about low rib point Turn wing over Using piece wood such ruler press wing down ward contact %2 sheet bond ribs CyA Work about three ribs time starting rib 1 skipping low ribs Maintaining straight sheet line out waves important gluing rib chip A-in triangle stock can used support skin low rib cap strips added later will hide multi tude construction errors Build wing tip attach rib 12 Center tip rib chord line leading edge 4 x %-in trailing edge balsa filler trailing edge tip will allow block sanding fit con tours %2 sheet aileron Attach tip webs will final sanded after rib caps place Add four hinge supports vertical-grain %2 spar webs between ribs 3 12 Fit rib iF place panel inch off work surface rib 12 set iF perpendicular work surface glue trailing edge spar notch tack gluing leading edge Note iF shown actual length plan reaches leading edge strip Allow space spar notches fit dihedral brace mating spars later Set panel aside construct oppo site panel similar manner completed second panel work surface fit two panels together El evate first panel 2 per draw ing push lower spars together until butt Slightly bevel spar end ob tain good fit upper dihedral brace slipped alongside upper spars clamped using least two clamps side wing centerline Make sure %-in dihedral brace fits flush slightly below spars sanding down later will difficult Add leading edge ply brace clamping same manner Rib iF will have razor sawed shorter Make sure horizontal centerline leading edge di hedral brace located correctly ribs 1 2 both panels bottom edge of servo mount sec Continued page 34 32 Model Aviation finished model resting authors balancing rack Location correct cxi shoula always determined model before making first trip out flying field idea RC Push-Pull 240 came WW Ii Dornier-335 Reported worlds fastest propeller-driven aircraft its time war ended before could made operational youve ever fuel tank split leak fuel fuselage know important install tank can trust Du-Bro Products manufactures complete line rugged polypropylene tanks 10 convenient sizes 2oz 24 oz guaranteed life against splitting leaking money back tank comes complete soft brass tubing hardware Protruding front lip prevents fuel lines being crimped hard landings Single twin vent design gas conversion stopper available use tank gasoline Cat No 400 Visit local Hobby Shop fuel hook up accessories can Cap Fittings In-Line Fuel Filter 0 Fuel Tubing Kwik Fill Fuel Value Gas Gb Fuel Tank Filter KwkF Fue Pump tion should parallel work sur face wing level upper spar leading edge clamped rear section wing panels butted trailing edge make final check spars run straight tip tip Hit ar eas CyA Carefully turn wing over clamp lower dihedral brace two clamps CyA Add four 3A-in triangle braces ribs 1 2 Complete center section shear webbing cut off con struction tabs Add balsa filler blocks trailing edge bays between ribs 1 iF Carve notch bottom iF accept W2 Install latter gluing flush bottom rib 1 Remove section iF accommodate aileron servo location Wl can shifted neces sary allow space aileron servo stall Wi add A-in triangles support W2 upper lower leading edge sheets attached /16 overhang leadmg edges Wetting outside surface sheets will make forming easier sheet edges will block sanded until leading edge provide flat gluing surface x 1-in leading edge cap Fasten -in -thick scrap spacer along leading edge masking tape Place wing fuselage check saddle area fit Remove wing epoxy hardwood hold-down blocks place temporary x -in cross brace glued near blocks fuselage side support epoxy has cured align wing fuselage hold place masking tape Drill through W2 hardwood blocks Y6 bit held perpen dicular W2 Remove wing re drill W2 A-in bit Tap blocks A-20 wing bolts Bolt wing place drill two s through F5 leading edge Wi Trial fit two /, dowels shown plan Use soft balsa foam filler around the wing bolt holes sanding down center section top sheeting Remove dowls complete wing sheeting rib caps leading edge cap Drill through leading edge cap /16 bit two dowels epoxied after wing has covered Ailerons Cut two aileron cores 3/ x 1-in aileron stock After making lightening holes cover ailerons /l6 sheet balsa Drill four holes hinge pins 1-in bit drill %2 hole torque rod Transfer hinge locations wing drill Trial fit ailerons hinge pins /2 torque rod assemblies alignment correct epoxy brass tubes onto wing trailing edge Remove ailerons final sanding covering Fuselage-wing assembly rmal fuse lage construction Razor saw two slots 34 Model Aviation top F5 sand accept wing dowels make /6 drilled holes oversized dowels inserted bolt wing place Lay small piece wood across top dowels trace its lower edge line location F5 Move down /16 below line just made fit piece A-in ply between dowel holes epoxy F5 Epoxy 3A-in triangle brace under ply Drill /16 hole center through ply tap A-20 bolt Treat hole CyA A-in ply wing hold-down has A-in drilled hole see drawing detail Cut two fuselage trim pieces / x % x 15 long medium-hard balsa Glue top FS extend yond FR about 4 dont glue beyond F7 Make /16 notch trim piece allow pulled together slightly behind FR secured rub berband tape Slip piece wax paper between FR FlO clamp FlO FR Glue FlO trim pieces being careful bond latter FS Cut piece x M-in balsa width F7A Add /16 ply top drill 140 hole #27 bit shown Glue x s-in piece top trim piec es F7 Glue F7A top crosspiece after fitting over /16 ply stall 1 A-in-long 6-32 socket-head bolt washer through 140 hole Use small piece tape keep bolt fall ing out Trim section preformed %2 skin fit between F7 FR overlapping both slight ly Sand bottom edges theyre alignment top trim pieces mate F7A FlO CyA skin trim pieces Aft hatch Razor saw remove aft ex tensions trim pieces cut through F7 Remove hatch section com plete application CyA F7A FlO piece plastic soda straw epoxied place will keep 6-32 bolt trapped Sand %2 skin flush F7A Install F8 F9 through slots cut formed skin Small pieces triangle stock add final rigidity unit Complete hatch front hold-down placing piece /16 ply 6-32 blind nut under two x 3A-in fuselage crosspieces Line up hatch snug up 632 bolt Use Du-Bro ball wrench inserted through small hole skin CyA ply place remove hatch epoxy ply cross members two /16 ply aft hold-down tongues installed follows Shave off excess material inside hatch trim piec es 6-32 bolt masking tape rear holding hatch place work through opening fuselage bottom Position ply tongues tack CyA F9 %2 sheet bond FS Remove hatch ep oxy tongues Again bolt hatch secure Continued page 136 EffectiveJanuary 1989 Fox motors except Combat supplied muffien some time have using soft sell approach columns customers direct some excerpts letters have received Eric larson Pine Grove CA Fox Mfq Yesterday bought Fox 4OBB Delux thefirst Fox engine have owned some apprehension bought anything other OS engine have burned before buying off brand engines Today am convened Fox 40 40SF similar both start idle magnfkenrly cant tell dfference power thats similarities end Fox 40 vibrates less easier adjust lighter comes great spinner costs hoff much American made hove now made sure everyone myflying club knovs what great buy Fox engines THANK YOU FOR QUALITY PRODUCT Eric Branham Paris IL r purchasing 40 Delux year lam impressed performs exceptional lot better OS Are planning replace Eagle III update 60 size will assured will first line purchase Jon Armitage Indiana PA ed send letter praise about motors motors used flew C/L FE started RC about year ago decided try Super Tiger 25 0S4 Stroke 40 good came bock Fox power quality handling allot decent price engines popular field Will Sgarlat Cape Cod MA note tbonksfor youve donefor wonde4izl hobby yourflne engines Dukes Mixture column temfic service offer us accidentally smash up Fox engines beyond what theyd care tackle repair Westley Keller Gouster OH have meaning drop linefor some time 40 motor trouble replaced put icing cake will never run anything planes unless says Fox side performance service says subject Decals present time am running 8 Fox engines am requesting Decals accordingly Alse lam lookingforsvard coming Eagle 4 Keep going best engines world Barry Doughty Absecon NJ placed old OS Max 60 Clipped Wing Cub Top Elite new Fox SOBA WOW what engine no vibration started right out box no adjustments Idled good accelerarionfrom idle full bock reenfic Weight bigfactor purchasing SOBBRC lighter OS SuperTigre Come etc Also must add replacement parts economical foreign imports Coming landing motor idled down beautifully settled infor great landing Again engine something else loads power very easy onfuelfor SO size engine John Holder Ob Seeverson AL ne obviously drfective else would have pulled wings off Aerostor 40 Seriously very pleased myfirse Fox engine Vaughn Kempf Modern Hobbies Miles City MI wanted take afew minutes send afew wards praise way talked three customers buying Fox 4OBB Delux motors quite impressed motors have couple observations pass along First havefound performancefigures seem little conservative modest measuring 14000 plus Master Airscrew 10 x 6 props using Royol Pro Tachfor readings Idle lower other 40 Ive ever ron realiable during spins soaps inverted idling Kenneth Wilson Schenectady NY know lam loyal satisfied Fox engine user over years Ive owned U/C 36 Fox R/C engines such Fox 2S early Fox 40 Eagle III currently own 2 Eagle Ills must compliment quality value youve designed built Fox engines Corey Wills Perryville MO compliment having thefinest engines made Several myfriends have flying Fosfor past three orfour years wouldnt give up other engine somewhat higher prices lately still cant beat affordability reliability performance Doc Matthess Wichita KS drop note express pleasure over engine Fox 45 Excellent midrange easy start set super neat spinner set up andfinally sofe incredible power larry Maltman Winnipeg Canada k kindlyfor promptly courteouslyfilling last order appreriate excellent service seems todays hurried ways few businesses take time what just seemed naturalfor Fox Mfg Ca have active builder/flyer since 1962 Myflest Fox engine reliable durable lam also happy state additional 17 Fox engines have purchased since 1962 running reliably consistently lester Goldsmith Action Hobbies Memphis IN riting tell Fox 60 Heli Engine has cranked run flawlessly rightfrom start Enclosed pictures Schluter Scout 60 1 did test run engine before installing believe really necessary because just cranked Fox 45 Heli today new unrun except byyourfacroryj new Schluter Junior though test run too cronked ran immediately idled perfectly very smooth believe word getting around Fox best buys now because compression al ways good making starting good power output always above average tops confirmed test articles magazines Life always goad because appear cut corners importantfeatures such bushed conn rods grades material Ruts always hand tap factory service unmatched anysvhere Eugene Mathis Daphne AL Fox 4OBB out Clubfleld last Saturday kicked tires lit thefires took off leaned bit andflight number twa went whole tank really started come Flight 3 very spectacular pulling vertical stall turn Ifinally throttle off hung prop just kept going veritable hoss because Kaos 40 weighs ran Walter Pawlukanis Oakhurst NJ normally write manufacturers anyone else asfar goes matter offact cant remember wrote last However am really impressed Fox 4OBB Delux WOW what engine have mounted 40 size Ugly Stik type airplane about 2-1/2 gals offuel through irsofar Eyes popping started right up required some hi 5 peed adjustment Since until now has gotten better better Vertical performance just doesnt quit ttle response certain sure Im willing wager bet money its certainty AlMancini las Angeles CA te thank youfor incredibly fast turn around phone order Onward Upward Andy Keeley Memphis IN ht Eagle III put 6-1/2 pound airplane next day flyingfield great airplane vertical performance needed Thank great engine also like Dukes Mixture Model Airplane News Happy Flying Manufacturing Company 5305 Towson Avenue Fort Smith AR 72901 Phone 501 646-1856 April 1989 35 Freebees available time new color catalog new price sheets parts sheersfor 1988 1989 model motors wauld appreciate receiving seffaddressed envelape twa stamps however masking tape rear Drill through sides tongues #29 bit 136 tap 8-32 nylon screws Replace fit hatch Sand Y32 skin flush FR Fit forward section formed sheet glue place hatch place shave sand trim pieces shape F6 aft FS Cowls nose cowl adds needed weight attaining correct center-of-gravity aft cowl merely cosmetic lost foam method can used make fi berglass cowls Styrofoam forms made undersized allow cowl wall thick ness Use batches Hobbypoxy 2 four layers 6-oz cloth strips nose cowl aft cowl takes layer same size strips Add final layer 2oz cloth both units After epoxy has set gouge out foam use acetone remove resi due ply cowl mounts installed last epoxy strips fiberglass cloth nose cowl should have final weight 4 oz Use hex ball-driver reach hid den socket-head bolts use extended sides FS shaped balsa blocks instead glass nose cowl may need add nose weight correct centerofgravity Empennage Its important build sta bilizer light strong aft engine right trying shake apart Build main frame flat over plan protected wax paper Notch tip pieces R-in-sq hard balsa spar Add 10 rib supports hinge blocks Dont forget A6 ply trailing edge doubler Trial fit frame fuselage Posi tion A-in-sq balsa inboard ribs hug fuselage sides sanding ribs ap propriate contour procedure allows unit covered prior attachment fuselage Add remaining ribs fit four A-in vertical-grain braces will epoxied place after stabilizer has covered attached Assemble elevators /I6 dowel block sand shape 015 alumi num support formed around dowel Build upper lower fins associated rudders upper rudder has groove its lower edge accept Y32 wire torque rod Fit upper fin place over F8 F9 lower fin tail post A-in birch ply predrilled A-in bit hinge point Make lower fin including /16 ply bearing piece %2-in hole lower torque rod trailing edge fin clamped glued after hard wood block formed tail wheel wire has glued place Add soft balsa filler set aside Rudder torque rods make upper torque rod start cutting two pieces % music wire making 2 sec ond 4/2 long Make 900 bend 1 end Solder -in sec tion K&S 125-in-sq brass tubing its end 3A-in leg Allow no solder outside brass part Tinning wire first sweat ing brass wire makes nice neat job Make upper torque rod Solder /2in piece 125-in-sq brass tubing onto end 1-in leg 2%-in piece 156-in-sq brass tubing slipped over 125 tubing ered Lay upper lower torque reds flat board relative positions Assem ble lower tube upper tube telescope mating parts one-fourth inch Tackle upper wire assembly soldering iron remelting upper joints applying very light pressure both 900 arms resting flat sur face arms will now lined up parts assembled specified before remelting lineup risk fusing whole assembly making un usable Telescope two parts checking ease fit dimensions Assembling covering Finish fuse136 Model Aviation ELECTRIC SEMI-SCALE Radio Control Sport/Trainer Wing Span 67 3/4 Length 37 1/2 EIII see Local DeCirn PAUL K GUILLOW INC WAKEFIELD MA 01880 Push-Pull/Masters Continued page 35 lage assembly fitting top batch canopy area sealing front fuel tank area epoxy Fl P2 provide fueltight compartment protect electronics carried below Assemble controls sup porting necessary Add triangle stock close up compartment F13 Cut lower hatch provide retaining Attach Halco strut four 4-20 aluminum bolts plastic nuts wheel pants sawed 4 x 12-in balsa block thick Reinforce A-in birch ply Resist tempta tion carve sand wheel pants nice streamlined shape need cer tain heft order contribute drag land ing time Remember although two engines idle frontal drag area single engine After final sanding vacuuming free dust cover individual parts favor ite material Coat both firewalls epoxy inside out covering stabilizer leave bottom center section open Position stab attach CyA checking align ment carefully Pass lower torque rod through /I6 ply bearing Fit lower fin slot F12 clamp lower tail post A-in Lite Ply fuselage cross brace Square up epoxy fm leading edge inside fuselage Attach A-in ply lower tail post A-in Lite Ply cross brace using CyA Glue four vertical-grain A-in braces stabi lizer fuselage sides Close up stab center section Push lower rudder over torque rod epoxied hinge point Make sure treat center hinge point pe troleum jelly expect hinge action af ter epoxy cures Angle upper torque rod position through its ply bearing join two torque rods Fit aft hatch place bolt Assemble upper rudder its hinge point Line up two rudders epoxy upper torque rod groove bottom rudder Install elevators attach 015in aluminum support aft firewall two No 2 screws Secure tail wheel tiller loop lower rudder small rubberband bound tightly possible tail wheel off set rudder pushrod undersize minimize servo shock engines place pipe up fuel systems using pressure both Use Hig ley Heavy Hub Master Airscrew 10-6 prop up front lighter Zinger 10-6 wood pusher prop rear combina tion will give extra 3 oz up front counts Install electronics feeding anten nae back through upper lightening holes snaking out three holes left side just above stabilizer Flying single servo controls both throt tIes using Du-Bro EZ connector ca ble arrangement servo throttle linkage can independently adjusted Set front engine reliable idle high-trim position Low trim should cut engine Kill front engine set up aft engine same manner Setting up engines manner makes unlikely both can cut off precisely same time However pre sents no problem since engine should fail final approach go-around single engine readily made desired Its unnec essary synchronize engines just have both running well Its important aft fuel tank car ried high possible within tail sec tion use piece l-in-thick foam under tank Since engine pusher configu ration does have rain carburetor air tank location relation needle valve critical order avoid early starvation fuel level lowers small sheet metal scoop attached direct rain air carburetor throat Although worked ef ficiently carrying tank higher much less trouble equally effective Keep simple Note also rear tank clunk stalled forward position Having used clunk pickup both directions pushers Ive found forward installa tion satisfactory requires much less fuel line As aircraft having pusher propel lers special precautions must observed prevent debris going through Continued page 141 April 1989 137 1t I] iyu 111 E1ii RE SHOOTING DOWN HIGH BALSA PRICES WITH SUPER QUALITY Satisfaction Guaranteed Direct Only BALSA SHEETS 36 48 30 BALSA STICKS 3648 16233 332240 18243 316249 14256 132337 20337 163374931 33234458 37 1835471 45 31636282 55 14373 95 61 516395110 38355124 71 123110155 34 3165191 116455 7648 332470 9456 18 48010666 316493122 75 14411013484 38 4165225139 12 4225261 MATCHED SHEETS 42 3324100 164109 3164120 144131 116 14 116 36 116 12 332 14 332 35 332 12 18 18 18 14 18 36 18 12 316316 316 38 316 12 14 14 14 30 412 14 34 141 516516 3838 3812 3634 381 1212 1234 121 58 55 34 34 Os 10 14 10 12 16 08 11 12 18 11 17 22 16 19 21 34 40 21 27 32 42 52 36 46 56 48 67 16 18 24 16 20 30 24 26 30 44 55 28 37 46 55 70 53 62 78 66 90 BALSA HOT LINE Call 806 745 6394 10am 6pm Central Time BALSA TRIANOL ES 36 25 8830 35 45 55 BALSA PLANKS36 86 0 00 1480 1123275 1124360 22225 23325 24435 33495 34668 TAPERED SHEETS36 142 65 143 65 382 83 23120 LONE STAREPOXY 90L sI--S 95 5so598 iSoro598 38 rro598 CUSTOM CUT CONTEST BALSA Sheets Piece ed Close Tolerances AAA Grade Dried ped 100% a serious modeler want performance must try 4-6 lb balsa LIGHT 4-6 LB WOOD 1 32 3 1/203 1163 332 3 183 3 163 143 383 123 343 13 1 164 3 324 184 3164 144 384 124 36 53 53 53 63 77 89 104 122 158 242 335 83 100 115 133 158 236 322 TRAILING EDGE 36 14132 51611439 3811246 12270 INSTANTOLUE 1 o TSck 298 10 750 298 20 T5ck 550 20 150 550 BASSWOOD 316316 31614 31638 31612 31634 1414 1438 1434 3838 3/812 3634 12 1 2 1234 BUNDLE DEALS 28116336695 201164361035 20332 336865 15332 436955 151/8336738 101/8436895 15318336920 10316436835 1014336655 101/4436830 103/8336870 53/84 36655 51/2336540 5124361580 10-3324 48885 518448500 5316 4 48600 514448645 48*NEW* 26Hundreds 30 38 46 cessories 60 ishing 42 materials 80 60 #10 SASE 70 atest 90 catalog 100SPRUCE STICKS 3648 18 181725 18 142026 18 3/822 32 316316 28 38 14 3/84055 14 124585 3/8 3/84969 38 126577 12 I/O6688 12347597 SPRUCE TRIANGLES 38 38 12 1 2 34 34 1846 18412 146 HARD MAPLE 1 4 36 3838 38 12 3834 1 2 IRCH DOWELS 18 316 14 516 38 18 40 45 50 58 68 36 09 11 14 25 32 3PiVBIRCH48 16412620 13212445 11612455 1812485 SPLVBIRCH 48 33212588 1/812 625 36316 12625 4714 12828 8438 12725 8112 12900 LITE PLY 48GROOVED LGMOUNTS lllachea 15538341840 3153834/532140 2501234916/45 495 V. Push-Pull/Masters Continued page 137 prop author owned full-scale Lake Amphibian pusher years found protecting propeller loose nuts bolts fishing rods always major concern twin engine push-pull arrangement especially vulner able front prop can kick up stones starter cables wiping cloths etc promptly present rear prop digestion Flying twin pusher also requires special watchfulness flight Push-Pull 240 near-fiasco Immediately after takeoff carburetor aft engine came loose moved pusher prop promptly seif-destructed en gine full bore extremely unbalanced tore itself firewallbefore fuel starvation saved day whole scenario lasted about three four seconds pilot Ray Doan brought ship back single engine thorough preflight check would have spared pusher prop main thing remember get Push-Pull smoothly aloft advance throttles steadily during takeoff Ground control will positive no torque cor rection required Clinibout will solid watch slice through ether sound twin 40s something else Radio Technique/Myers Continued page 37 RC34 through RC37 vice versa 2 next condition change comes out mathematics frequencies coo Image interfer ence will return few SC455s Some folks will remember 7296 Y/W used image 7208 Bn/W Well SC455s RCll-14 RC57-60 can af fected Tx within band have local oscillator wrong side assume manufacturers simply wont sell SC455s channels Besides image coincides exactly Common Car rier Tx frequencies RC Tx helps Rx low LO have possibility imaging TV4 RC44 problem know love So see nothing simple cure above simple Use dual conversion Rx entry-level RC system almost always uses SC455 manufacturers will have narrow-band pay attention proper LO signments keep off RCll 12 13 14 34 35 36 37 57 58 59 60 Jim didnt mention channel doubt above manufacturers just arent selling Indirect Interference condition comes out numbers called Second Order Intermodulation Product Interfer ence 21M generated ANY PAIR Tx operating 23 RC channel numbers apart difference two frequencies modu lated 460 kHz signal often goes right through 5C455 detected interference Think 21M generated JUST ONE PAIR Tx might hit OWBAM SC45Ss SO channels simultaneously including own Rx depending signal strength Rx tenna RECEIVER CHARACTERIS TICS Nobody uses odd-numbered RC chan nels RCll 13 15 today dont see 21M Can predict what will happen give 25 odd-numbered channels another service Now remember discussing RE CEIVER problems assumption everyone already using Gold-stickered narrowband transmitters Practically Tx built since 1987 good enough warrant sticker easiest way avoid problems listed above use dual-conversion receiver dont have block out ANY channels Jim manufacturer offers best dual-conversion receivers market relatively cheap recommend letter appropriate person named end last months column narrow-band 5C455 can work cause interferences discussed above z off 455 kHz intermediate frequency IF dead like 31M Narrow-band SC455s exist example Bob Aberle recently tested Polks Pow ermax Merlin system receiver 5C455 RC46 its LO low side An IF bandwidth 6 dB 2 kllz claimed nothing quoted 85 kHz Merlin performance meets AMA guide lines except ins LO wrong side does use dual conversion DC outper formed 1991 DC system have tested ex cept its PCM computer slow April 1989 141 LONE STAR MODELS1412 1623 S7th St Lubbock TX 79412 cant 46 Handling charge pay UPS Add $250 COD $300 extra PP APO FPO StateS accept Vs4 Master Card personal checks COO 6% 368/n TenaS US crrency Mnmom Wood Order 51000
Edition: Model Aviation - 1989/04
Page Numbers: 24, 25, 26, 27, 28, 29, 30, 31, 32, 34, 35, 136, 137, 141
NO OCR TEXT NO OCR TEXT Left aft hatch hides 6-oz fuel tank tar rear engine natchlfin unit rejainca wuin trappea o-a aovw-neea oumi ana iwo O-J nylon screws Right Removing front hatch reveals plywood keeper holding two wing dowels place Under Sig canopy Williams Bros pilot ready go wing bolt covers made aluminum cigar wrappers have painted match Left simple onset tail wheel tiller lessens servo shock during ground operations Right Fiberglass cowls nice addition model difficult make 4-oz weight nose cowl helps balance aft cowl may omitted desired Fuselage Use piece A-in Lite Ply 12 wide 48 long Determine whether want separate fiberglass nose cowl built-up front engine compartment opt built-up style add 4 part labeled PS front FW plan Placing Lite Ply under fuselage side view locate end points straight lines pin pressed ply Con nect points using ball-point pen Hav ing basic lines straight makes easy work drawing sides curved sec tion wing saddle can traced few pieces carbon paper slipped between plan plywood Cut out PS sand down lines shown plan Trace second side first cutting sanding outline Clamp two sides togetheror socket-head bolts attachIng cowls can reached hex ball-driver hold together small pieces masking tapewhile block sand identical size errors tracing inevi table Make sure edges square 6 x 12-in piece /16 birch ply used nose doublers F4 Use FS template Make cutout section gear mount P3 Apply very thin coat 30-minute epoxy doubler P4 position FS making sure allow firewall FW Use weights clamps until ep oxy sets Make right left fuselage side asme Haico B106-8 strut Du-Bro axle K&S 062 aluminum clip hold rugged plywood-reinforced wheel pants place sembling its respective birch nose doubler Make two aft doublers Fl 1 attach thin layer epoxy Allow correct spacing aft fire wall FR two small doublers F6 can also attached using white glue suggested sides resanded en sure upper lower edges true identical sides placed inside surface faces up carefully draw locations Fl F2 F5 F6 F7 Make firewall FW laminating A-in birch ply Cut FR X6-in birch ply Draw horizontal vertical thrust lines both sides firewall will using engines different makes pick heaviest tractor front unit engine including muf 26 Model Aviation DESIGNED BY AL MASTERS IG WC 813 CRrJOPY FI0ERGLR ccWL--pwORKW OP&BOJTOM 3A6LA GOLD8ER%RLBR_ \\ /axBf4L N / 2 _____ NGL016 pIY IV 13~gW 3/ 15 pUI y8%Y I3R$A Qj 4EET 1~ 4 C ~RVY 2 Weigh wing spars determine two heaviest Place 01 heavy spars right panel other left fler attached its mount position firewall canting counterclockwise see front view Hold thrust line indicated allow muffler clearance proper carburetor location respect fuel tank Mark drill firewall stall four 6-32 blind nuts three tend use fiberglass cowl back side aft engine side mounted exhaust down standard mount such Dave Brown 4045 can used light weight variety shown plans engine should placed close FR possible still allowing clearance Tatone EM 4Oss manifold Lite Ply spac ers can used between FR mount mount arms longer neces NOTE FRONT ENUINE INSTALLATION-TUT CHORE FOR CORRECT LOCATiON OF EARNURETOR IN RELATION TO FUEL TANR ATTACM MOUNT TO FERWALL WETTI FOUR 14-32 T-MJTS N BOLTS LOWER MATCR CR LITE PLYF13 1-1 II lOOT UTE PLYII MUFPLER LUCATIONfl I504 RALSA TRISTUCO I/S PLY 4.BOTCH FUR MAPLE MOCR IIIII I/U RALSA TRI-OSUCI I/O PLTiiAjTj I ICONSTRUCTION 010 iT - - NOTE SERVO SHOWN FROMLM PLY SERVO TRAY ELEVATOR AILERONS IRUODEU I/O PLY WOOD I/H PLT IHEMUVAMLEI 6 ~ITEj I/lU PLYPUPLY WITH F-IS I/O CITE PLYHI/lU PLY14-02 TNUT 0101EV HEAVY---2~ ATCH -- OUR IOUZI -UIIBUZI AU TWO-CYCLEFAIrSUORO S-b TUSOIOU MALSA--H \iiiEAGNEII-V TUCKI IF BALANCE IFUAMI SERVO04 L PLY WITHOUT I 1CUSYRUL MASTER AIRSCSEYR 0-14RATT LYSUPPORT GOLORERO 2 SONNER\V- 0-SO ECE1YLR 11400 EI51 TROT--I IFLUM001CR VUNISE HEAVY WALL FIREROLASS COWLP13 IA PRAX 4 00 COMPLEVEUTE PLYHATCH HALCO BlUR-UI/H -005/4 ALUM ROLl 002 005 ALUMLASOINO SEAM H OTLUS SLYTIVI LANOINO OEAR CLIPLIURTEN RAND TU FIT/ ER PLYWOOD- I/O PLY lBALSAZi4IA OOR LITE ATTOEB WITH 004-40 NUTO BOLT TO.. 145O SERER/NAT EAO _FUSELAGI VI E 000140 040 REMOVE NOT FROM RALCO UEAR TAP FOR 001400 VOLE -GZYS 010 500 04 sary should cropped off save weight Use three 4-40 blind nuts bolts install mount Remove mounts before continuing fuselage con struction Cut remaining fuselage components materials specified Note Fl A-in birch ply includes switch cut out F12 F13 shown actual length plan can traced piece Left Fuselage parts Lite Ply sides bottom conjunction birch ply balsa keep weight distribution under control No tice two pre-formed balsa skin pieces fuselage side dou blers have already glued place Above Completed basic fuselage straight lines design signify easy layout 28 Model Aviation wing ribs Irst cut out witn construc tion tabs left provide easy method building necessary wing washout Full-Size Plans Page 188 F-I2oR LITE PLYAFT ENGINE MOUNT 1/H Lire PLY SPACER ID OH 4 REOHIREBI 141 HOLES TO WATCH L/2BALSAENGINE CASE THFSTOCHI/TDA WALSH -I 052 KS S--ATTACH TO F-fl WITH LS KS/B BALSAALABINOM131 4-40 T-NUTS S BOLTS BLOCK3/8 SOFT BALSA TAP FOR I/O-ZOkS/H 010 FIHEHOLASS COWLSPINNER -I -flE-KAF-Il III iCANOPT- COCKPIT AREA IAIII III I I _ -II __IIIII I I/ZBALSAI OW PL F-Nil I11 ...I II THFSTOCK HATCH TONGUE - I F-ri II 711 UiI i -----ZINOES 10 K Fl/A H-SO RH HALTEPOXYOx 3/4 BALSAPOSHEK PHOP TRAPPED E TOP VIEW EPOOTPSAS SYWAW'\I/B LITE PLY 1/1K PLY--.....WAKE I/H TM-STOCK I 3HBALSA0TRIBTO L~--IF-SROBART DOW F-SL_________IT-NOT K-D2 IEPOOTIOs HEMOVE FOR FOEL illiiiTANK ACCESS IIIII pF-6Ul II 04A IRE ORR IN PkASYIC ISO 121 SODA BALSA F-R 1540KF-fl T I-P/KS/IS PLYWOND Fl-Ia 3 I/2T ____ 2-I/H L 1/2 3-I/O 3/sO WOSIC WISE -1/1K PLYWOOR - R 156 50 040K lOSSO 1OYEW MWSOWER IAFTER UFE OP WITH 15K SQ BRASSASH TO SHAPE TUBENOTE RUBBERS AWE 0*EL A2EAEJaLI I42AALKZ2RN 125 50 BRASS _____I/U BALSA SHEETTUBE SHER MW HODDEK ISOFTISOLDEK - 'I/IHPLTWOOO I/H LITE PLY SPOCEKS 3/32 BALSA-NBLENO 3/32 I-D4 AlASHEET7AT WATER 2 TI -.LL/TUPTYHO FOR B52 NYLONFS SCREW 121 STABILIZEHi~ -1/1K PLYWOHO LS LITE PLY NOTE AFT EWAIRE COWL IS USHT WEIGUT- LAYER H DO LOATH PLUS LAYER 2 02 OLSON AFT EWAINE 500k ALL BATEHIAL MEDIUM BALSA ARLESS SPECIFIED OTHER Sb WC HID CANOPY RE-WORKEOI niN - FRAY F-7"HATCH BALSAII F-00F-B STOCK vzziU ALL LYBx 3/4I --. SOFT BALSA FILL F-HTIWVOKD/B.-24T1 ALSAI________ __________________-N I/ZBALSA F-Il 01 "CLuRK FOG THI-STOCK .----Io --STABILIZ VL SOALSOWALSA I/BBRLSA R-BLOCK SHEET I/O BALSA THI-STOCKF-6ALS PLC T AID- H HEOKIHEB~----4-40 BOLT-REROOC HEAD OR 1/H LITE PLY PLY N ESOAKS/AF-90TH 00 BALSA BALSABASIC WIRE IEf7iLSOFT BALSA PLYCLUMP N SLOE FILL --1SPECIFICAT IONS - SECT A SAWS WING SPUN HO COT OOT AFTER/550 AREA SQ 14 3/52 BALSA SHEETZNZATTASH AFT-PLYWOWOWEISHY IFUELEDI 9 LSC HDZ ASSES BLY IW PLYMAKE 2WISH LSAOINU OZ AIRFOIL.IH 7 SERI-SYM 34K BALSA SHEET L/$3JWITB WASHOUT POWER TWO 00 ENOIRED F-IaF- IF-S-HATCH2-CYCLE TeNUE F-H BLITE PLY 121 MODEL AVIATION PUSH-PULL 240 TWIN ENGINE R/C MODEL DESIGNED BY AL MASTERS TRACING BY JOE DEMARCO sanded correct outline cut apart finished components should include drawn centerlines aid lineup during sembly Cut lightening holes F12 af ter separating F13 Glue six con struction aids F12 Make preformed 3A2 balsa skin aft fuselage section will need some household ammonia cardboard tube approximately three-inch diameter core tube Christmas wrapping paper works fine Left The wing panel begins take shape has turned over show construction tabs Above bare bones horizontal tall show lightweight structure Because engine vi bration1 must rugged conventional model April 1989 29 upper rudder fitted square brass tube assembles lower rud der tall wheel hatch offers easy ac cess fuel tank supplying aft engine Wheel pants cut 1-in balsa block reinforced 1/-in birch ply carve nice streamline shape ex tra drag helps slow model down during landing model twin has frontal drag single-engine model finished nose cowl foam plug roughed-out aft cowl plug aft cowl can omitted front cowl adds 4 oz much needed nose weight lightweight aft engine mount used help get right CG Select two 7-in lengths /32 sheet 6-in-wide stock Trim balsa 5in width soak ammonia STABILIZERS/B SO BALSA LEADING LEFT STABILIZER STARRI PA CITE PLY BEFORE I/B lI/A BALSA~OsA SEE SHEET RIBS ORE OBOESTRISTOCK VBx I/A BALSA RIB SUPPORT I2OBALS S/IHZ I/OFiLL BALSAJ 7BABORT3OBI/OSA HOBOij BALSA SPAR CSCRAP BALSA 01 I/Bx I/O BIB SUPTS015 ALA /1/ AOR PETLOWER SURFASE INSET / 3/0 SOFT BALSA SHEET S/TOZZRALSASHLfl IBS-SAEETI NOT SBOSAN OR LEFT / ROSA SARIS1/5 50 OARS 3/32 SCRAPTA CONTOURBALSA BALSA RIBSvO BALSA SHEET BATE TRIAL FIT STAR TO VFOSELAAE BEFORE ATTACRIRS VA SO BALSA I FILLELEV-STAB SECTI LVI I/A BALSA I COVERING STAB IIAVA SCREAj~ PUT 7ORILL FOR ipL5/32 B BI I/A BALSA LEASISS OIS ALUMEASEy 0/01122n-p-iiBALSA /_____UWING ____ I_ ~1I _____ PLAN TOP VIEW _______I BALSASBIItZ BALSA 5/52 BALSAI I/B xl BALSA LE3/Az OBEET RIRIO V4x S/B I/B I/O BALSABALSA SOB LEABISA EPSEI/H BALSA2 RISER 5PM SHEETWITHOUT CAP S/SO RALSAVA 120BALSA WISE SHEETINGSPARS 5/52 BALSA least five minutes Blot wood pa per towel wrap around tube using masking tape hold place Set balsa skin aside allow air dry thor oughly Save ammonia another proj ect Begin assembling fuselage over top view plan Support sides up right glue firewall place using F5 spacer Use white glue since will allow time lining everything up Place weight such ordinary brick top front edges fuselage sides clamp FW place pull aft fuselage section together time lower fuselage line forward F5 straight weight will keep setup square work surface until glue sets Attach FR using white glue 10-minute epoxy aid clamp Hold sides together attach F6 cyanoac rylate CyA Add two 14 x %-in crosspieces fit Fl 1 Check position WINO L DIHEDRAL DETAIL NOT SCALE F5 tack CyA Make relief notches Fl clear blind nuts back side FW Force Fl position will aid correcting misalignment front firewall F5 attach CyA Install /6 x A-in hardwood servo rails make servo tray A-in ply fit After gluing F3 place set fuselage asideyoull com pleting laterand proceed wing Wing Trace cut set ribs using pattern make second set Fin ish sand ribs pairs draw chord lines shown both sides rib Cut dihedral braces draw two centerlines indicated both sides leading edge brace Cover wing plan wax paper plastic film before pro ceeding Cut four straight x A-in balsa spars length point weigh four pieces distribute spars avoid using LS 1122 SUB LEAGIRS EDGE 30 Model Aviation Due heavy side loads engine weight necessary use birch ply hardwood lower tail post system Note soldered upper lower torque rods Full-Size Plans Available Page 188 I/B BALSA REMOVE FOR SERVOSMEET IFI 2 Q1 — U AILERON SERVO-L SOFO RULVA- 01 LI lb 0I RALSA OREET IOFT ALSA SO EDGE S/IA DIA DOWELS WINO SOLO SOWN I] NOTE BIBS 2 TRRU 12 ABE 5/32 BALSA SHEET 3 [I 45678910II12 111 II r I OR BALSA SHEET WISH YIP FRAMES I/R PLVWDODV UPPERI/R PLYWOOD_______ I/R LITE PLO1QWiR t __ LEADING EDGE VA PLYWOOD S/DO RALSA SHEET TVP H BOVVOMjSERVO DOONYDIHEDRABRACESWING TIP DETAIL HAL NA S/HI/O /0 BALSA1II______ 71 FILLHOII WINO BOLT PLY4 ACCESS I/O BALSA SUBEE -PUSHPULL 240 3/BR I/O OIL STOCHL --TWIN ENGINE R/C MODEL RI LIGHTENINS ROLES ISV BTA FUSELAGEI/IS BALSA SHEETDESIGNED BY AL MASTERS SIDEBATH SIDESWORK SURFACE I254NTRACING BY OE DEMARCO IIIII ALL RIGHTS RESERVED FILL ISO MUSIC IKE EPOOVI / I/B BRASS TUBE EPOXY TO OK aileron servo carried well forward wing Z-bends A-ln music wire pushrods used connect servo Arm II I-V117j4I TRI-STOCEILIli-TiI #~p Iftv 11-----S I/B LIVEF4[~SRWVAII DLV April 1989 31 receiver battery pack three servos nestled lower nose section below 12oz front fuel tank dual take-offs 5-26 servo controls throttles both engines Left Both K&B 40 05 4OFP have used tor tne aft engine witn equal success Lite Ply spacers firewall provide clearance Tatone manifold Right fuel tank nose compartment sealed keep fuel leaking electronics below two heaviest same wing panel postal scale coding used Glue lower ply dihedral brace spar halves position spar over plan securing pins weights Position ribs 1 through 12 spar making sure construction tabs resting work surface x %-in trailing edge x /2-in leading edge pinned place ribs aid lineup space between ribs 1 2 pro vides leading edge brace will slipped later After making sure ribs perpen dicular work surface CyA ribs spar leading edge trailing edge Fit upper spar glue place Block sand upper surface trailing edge slightly follow rib contours Select four sheets %2 balsa 2-in stock upper lower trailing edge skins Check weights using two heaviest opposite panels Hold metal yardstick edgewise across ribs board sheet edge certain sheet line will straight attached ribs high rib can carefully sanded down dont worry about low rib point Turn wing over Using piece wood such ruler press wing down ward contact %2 sheet bond ribs CyA Work about three ribs time starting rib 1 skipping low ribs Maintaining straight sheet line out waves important gluing rib chip A-in triangle stock can used support skin low rib cap strips added later will hide multi tude construction errors Build wing tip attach rib 12 Center tip rib chord line leading edge 4 x %-in trailing edge balsa filler trailing edge tip will allow block sanding fit con tours %2 sheet aileron Attach tip webs will final sanded after rib caps place Add four hinge supports vertical-grain %2 spar webs between ribs 3 12 Fit rib iF place panel inch off work surface rib 12 set iF perpendicular work surface glue trailing edge spar notch tack gluing leading edge Note iF shown actual length plan reaches leading edge strip Allow space spar notches fit dihedral brace mating spars later Set panel aside construct oppo site panel similar manner completed second panel work surface fit two panels together El evate first panel 2 per draw ing push lower spars together until butt Slightly bevel spar end ob tain good fit upper dihedral brace slipped alongside upper spars clamped using least two clamps side wing centerline Make sure %-in dihedral brace fits flush slightly below spars sanding down later will difficult Add leading edge ply brace clamping same manner Rib iF will have razor sawed shorter Make sure horizontal centerline leading edge di hedral brace located correctly ribs 1 2 both panels bottom edge of servo mount sec Continued page 34 32 Model Aviation finished model resting authors balancing rack Location correct cxi shoula always determined model before making first trip out flying field idea RC Push-Pull 240 came WW Ii Dornier-335 Reported worlds fastest propeller-driven aircraft its time war ended before could made operational youve ever fuel tank split leak fuel fuselage know important install tank can trust Du-Bro Products manufactures complete line rugged polypropylene tanks 10 convenient sizes 2oz 24 oz guaranteed life against splitting leaking money back tank comes complete soft brass tubing hardware Protruding front lip prevents fuel lines being crimped hard landings Single twin vent design gas conversion stopper available use tank gasoline Cat No 400 Visit local Hobby Shop fuel hook up accessories can Cap Fittings In-Line Fuel Filter 0 Fuel Tubing Kwik Fill Fuel Value Gas Gb Fuel Tank Filter KwkF Fue Pump tion should parallel work sur face wing level upper spar leading edge clamped rear section wing panels butted trailing edge make final check spars run straight tip tip Hit ar eas CyA Carefully turn wing over clamp lower dihedral brace two clamps CyA Add four 3A-in triangle braces ribs 1 2 Complete center section shear webbing cut off con struction tabs Add balsa filler blocks trailing edge bays between ribs 1 iF Carve notch bottom iF accept W2 Install latter gluing flush bottom rib 1 Remove section iF accommodate aileron servo location Wl can shifted neces sary allow space aileron servo stall Wi add A-in triangles support W2 upper lower leading edge sheets attached /16 overhang leadmg edges Wetting outside surface sheets will make forming easier sheet edges will block sanded until leading edge provide flat gluing surface x 1-in leading edge cap Fasten -in -thick scrap spacer along leading edge masking tape Place wing fuselage check saddle area fit Remove wing epoxy hardwood hold-down blocks place temporary x -in cross brace glued near blocks fuselage side support epoxy has cured align wing fuselage hold place masking tape Drill through W2 hardwood blocks Y6 bit held perpen dicular W2 Remove wing re drill W2 A-in bit Tap blocks A-20 wing bolts Bolt wing place drill two s through F5 leading edge Wi Trial fit two /, dowels shown plan Use soft balsa foam filler around the wing bolt holes sanding down center section top sheeting Remove dowls complete wing sheeting rib caps leading edge cap Drill through leading edge cap /16 bit two dowels epoxied after wing has covered Ailerons Cut two aileron cores 3/ x 1-in aileron stock After making lightening holes cover ailerons /l6 sheet balsa Drill four holes hinge pins 1-in bit drill %2 hole torque rod Transfer hinge locations wing drill Trial fit ailerons hinge pins /2 torque rod assemblies alignment correct epoxy brass tubes onto wing trailing edge Remove ailerons final sanding covering Fuselage-wing assembly rmal fuse lage construction Razor saw two slots 34 Model Aviation top F5 sand accept wing dowels make /6 drilled holes oversized dowels inserted bolt wing place Lay small piece wood across top dowels trace its lower edge line location F5 Move down /16 below line just made fit piece A-in ply between dowel holes epoxy F5 Epoxy 3A-in triangle brace under ply Drill /16 hole center through ply tap A-20 bolt Treat hole CyA A-in ply wing hold-down has A-in drilled hole see drawing detail Cut two fuselage trim pieces / x % x 15 long medium-hard balsa Glue top FS extend yond FR about 4 dont glue beyond F7 Make /16 notch trim piece allow pulled together slightly behind FR secured rub berband tape Slip piece wax paper between FR FlO clamp FlO FR Glue FlO trim pieces being careful bond latter FS Cut piece x M-in balsa width F7A Add /16 ply top drill 140 hole #27 bit shown Glue x s-in piece top trim piec es F7 Glue F7A top crosspiece after fitting over /16 ply stall 1 A-in-long 6-32 socket-head bolt washer through 140 hole Use small piece tape keep bolt fall ing out Trim section preformed %2 skin fit between F7 FR overlapping both slight ly Sand bottom edges theyre alignment top trim pieces mate F7A FlO CyA skin trim pieces Aft hatch Razor saw remove aft ex tensions trim pieces cut through F7 Remove hatch section com plete application CyA F7A FlO piece plastic soda straw epoxied place will keep 6-32 bolt trapped Sand %2 skin flush F7A Install F8 F9 through slots cut formed skin Small pieces triangle stock add final rigidity unit Complete hatch front hold-down placing piece /16 ply 6-32 blind nut under two x 3A-in fuselage crosspieces Line up hatch snug up 632 bolt Use Du-Bro ball wrench inserted through small hole skin CyA ply place remove hatch epoxy ply cross members two /16 ply aft hold-down tongues installed follows Shave off excess material inside hatch trim piec es 6-32 bolt masking tape rear holding hatch place work through opening fuselage bottom Position ply tongues tack CyA F9 %2 sheet bond FS Remove hatch ep oxy tongues Again bolt hatch secure Continued page 136 EffectiveJanuary 1989 Fox motors except Combat supplied muffien some time have using soft sell approach columns customers direct some excerpts letters have received Eric larson Pine Grove CA Fox Mfq Yesterday bought Fox 4OBB Delux thefirst Fox engine have owned some apprehension bought anything other OS engine have burned before buying off brand engines Today am convened Fox 40 40SF similar both start idle magnfkenrly cant tell dfference power thats similarities end Fox 40 vibrates less easier adjust lighter comes great spinner costs hoff much American made hove now made sure everyone myflying club knovs what great buy Fox engines THANK YOU FOR QUALITY PRODUCT Eric Branham Paris IL r purchasing 40 Delux year lam impressed performs exceptional lot better OS Are planning replace Eagle III update 60 size will assured will first line purchase Jon Armitage Indiana PA ed send letter praise about motors motors used flew C/L FE started RC about year ago decided try Super Tiger 25 0S4 Stroke 40 good came bock Fox power quality handling allot decent price engines popular field Will Sgarlat Cape Cod MA note tbonksfor youve donefor wonde4izl hobby yourflne engines Dukes Mixture column temfic service offer us accidentally smash up Fox engines beyond what theyd care tackle repair Westley Keller Gouster OH have meaning drop linefor some time 40 motor trouble replaced put icing cake will never run anything planes unless says Fox side performance service says subject Decals present time am running 8 Fox engines am requesting Decals accordingly Alse lam lookingforsvard coming Eagle 4 Keep going best engines world Barry Doughty Absecon NJ placed old OS Max 60 Clipped Wing Cub Top Elite new Fox SOBA WOW what engine no vibration started right out box no adjustments Idled good accelerarionfrom idle full bock reenfic Weight bigfactor purchasing SOBBRC lighter OS SuperTigre Come etc Also must add replacement parts economical foreign imports Coming landing motor idled down beautifully settled infor great landing Again engine something else loads power very easy onfuelfor SO size engine John Holder Ob Seeverson AL ne obviously drfective else would have pulled wings off Aerostor 40 Seriously very pleased myfirse Fox engine Vaughn Kempf Modern Hobbies Miles City MI wanted take afew minutes send afew wards praise way talked three customers buying Fox 4OBB Delux motors quite impressed motors have couple observations pass along First havefound performancefigures seem little conservative modest measuring 14000 plus Master Airscrew 10 x 6 props using Royol Pro Tachfor readings Idle lower other 40 Ive ever ron realiable during spins soaps inverted idling Kenneth Wilson Schenectady NY know lam loyal satisfied Fox engine user over years Ive owned U/C 36 Fox R/C engines such Fox 2S early Fox 40 Eagle III currently own 2 Eagle Ills must compliment quality value youve designed built Fox engines Corey Wills Perryville MO compliment having thefinest engines made Several myfriends have flying Fosfor past three orfour years wouldnt give up other engine somewhat higher prices lately still cant beat affordability reliability performance Doc Matthess Wichita KS drop note express pleasure over engine Fox 45 Excellent midrange easy start set super neat spinner set up andfinally sofe incredible power larry Maltman Winnipeg Canada k kindlyfor promptly courteouslyfilling last order appreriate excellent service seems todays hurried ways few businesses take time what just seemed naturalfor Fox Mfg Ca have active builder/flyer since 1962 Myflest Fox engine reliable durable lam also happy state additional 17 Fox engines have purchased since 1962 running reliably consistently lester Goldsmith Action Hobbies Memphis IN riting tell Fox 60 Heli Engine has cranked run flawlessly rightfrom start Enclosed pictures Schluter Scout 60 1 did test run engine before installing believe really necessary because just cranked Fox 45 Heli today new unrun except byyourfacroryj new Schluter Junior though test run too cronked ran immediately idled perfectly very smooth believe word getting around Fox best buys now because compression al ways good making starting good power output always above average tops confirmed test articles magazines Life always goad because appear cut corners importantfeatures such bushed conn rods grades material Ruts always hand tap factory service unmatched anysvhere Eugene Mathis Daphne AL Fox 4OBB out Clubfleld last Saturday kicked tires lit thefires took off leaned bit andflight number twa went whole tank really started come Flight 3 very spectacular pulling vertical stall turn Ifinally throttle off hung prop just kept going veritable hoss because Kaos 40 weighs ran Walter Pawlukanis Oakhurst NJ normally write manufacturers anyone else asfar goes matter offact cant remember wrote last However am really impressed Fox 4OBB Delux WOW what engine have mounted 40 size Ugly Stik type airplane about 2-1/2 gals offuel through irsofar Eyes popping started right up required some hi 5 peed adjustment Since until now has gotten better better Vertical performance just doesnt quit ttle response certain sure Im willing wager bet money its certainty AlMancini las Angeles CA te thank youfor incredibly fast turn around phone order Onward Upward Andy Keeley Memphis IN ht Eagle III put 6-1/2 pound airplane next day flyingfield great airplane vertical performance needed Thank great engine also like Dukes Mixture Model Airplane News Happy Flying Manufacturing Company 5305 Towson Avenue Fort Smith AR 72901 Phone 501 646-1856 April 1989 35 Freebees available time new color catalog new price sheets parts sheersfor 1988 1989 model motors wauld appreciate receiving seffaddressed envelape twa stamps however masking tape rear Drill through sides tongues #29 bit 136 tap 8-32 nylon screws Replace fit hatch Sand Y32 skin flush FR Fit forward section formed sheet glue place hatch place shave sand trim pieces shape F6 aft FS Cowls nose cowl adds needed weight attaining correct center-of-gravity aft cowl merely cosmetic lost foam method can used make fi berglass cowls Styrofoam forms made undersized allow cowl wall thick ness Use batches Hobbypoxy 2 four layers 6-oz cloth strips nose cowl aft cowl takes layer same size strips Add final layer 2oz cloth both units After epoxy has set gouge out foam use acetone remove resi due ply cowl mounts installed last epoxy strips fiberglass cloth nose cowl should have final weight 4 oz Use hex ball-driver reach hid den socket-head bolts use extended sides FS shaped balsa blocks instead glass nose cowl may need add nose weight correct centerofgravity Empennage Its important build sta bilizer light strong aft engine right trying shake apart Build main frame flat over plan protected wax paper Notch tip pieces R-in-sq hard balsa spar Add 10 rib supports hinge blocks Dont forget A6 ply trailing edge doubler Trial fit frame fuselage Posi tion A-in-sq balsa inboard ribs hug fuselage sides sanding ribs ap propriate contour procedure allows unit covered prior attachment fuselage Add remaining ribs fit four A-in vertical-grain braces will epoxied place after stabilizer has covered attached Assemble elevators /I6 dowel block sand shape 015 alumi num support formed around dowel Build upper lower fins associated rudders upper rudder has groove its lower edge accept Y32 wire torque rod Fit upper fin place over F8 F9 lower fin tail post A-in birch ply predrilled A-in bit hinge point Make lower fin including /16 ply bearing piece %2-in hole lower torque rod trailing edge fin clamped glued after hard wood block formed tail wheel wire has glued place Add soft balsa filler set aside Rudder torque rods make upper torque rod start cutting two pieces % music wire making 2 sec ond 4/2 long Make 900 bend 1 end Solder -in sec tion K&S 125-in-sq brass tubing its end 3A-in leg Allow no solder outside brass part Tinning wire first sweat ing brass wire makes nice neat job Make upper torque rod Solder /2in piece 125-in-sq brass tubing onto end 1-in leg 2%-in piece 156-in-sq brass tubing slipped over 125 tubing ered Lay upper lower torque reds flat board relative positions Assem ble lower tube upper tube telescope mating parts one-fourth inch Tackle upper wire assembly soldering iron remelting upper joints applying very light pressure both 900 arms resting flat sur face arms will now lined up parts assembled specified before remelting lineup risk fusing whole assembly making un usable Telescope two parts checking ease fit dimensions Assembling covering Finish fuse136 Model Aviation ELECTRIC SEMI-SCALE Radio Control Sport/Trainer Wing Span 67 3/4 Length 37 1/2 EIII see Local DeCirn PAUL K GUILLOW INC WAKEFIELD MA 01880 Push-Pull/Masters Continued page 35 lage assembly fitting top batch canopy area sealing front fuel tank area epoxy Fl P2 provide fueltight compartment protect electronics carried below Assemble controls sup porting necessary Add triangle stock close up compartment F13 Cut lower hatch provide retaining Attach Halco strut four 4-20 aluminum bolts plastic nuts wheel pants sawed 4 x 12-in balsa block thick Reinforce A-in birch ply Resist tempta tion carve sand wheel pants nice streamlined shape need cer tain heft order contribute drag land ing time Remember although two engines idle frontal drag area single engine After final sanding vacuuming free dust cover individual parts favor ite material Coat both firewalls epoxy inside out covering stabilizer leave bottom center section open Position stab attach CyA checking align ment carefully Pass lower torque rod through /I6 ply bearing Fit lower fin slot F12 clamp lower tail post A-in Lite Ply fuselage cross brace Square up epoxy fm leading edge inside fuselage Attach A-in ply lower tail post A-in Lite Ply cross brace using CyA Glue four vertical-grain A-in braces stabi lizer fuselage sides Close up stab center section Push lower rudder over torque rod epoxied hinge point Make sure treat center hinge point pe troleum jelly expect hinge action af ter epoxy cures Angle upper torque rod position through its ply bearing join two torque rods Fit aft hatch place bolt Assemble upper rudder its hinge point Line up two rudders epoxy upper torque rod groove bottom rudder Install elevators attach 015in aluminum support aft firewall two No 2 screws Secure tail wheel tiller loop lower rudder small rubberband bound tightly possible tail wheel off set rudder pushrod undersize minimize servo shock engines place pipe up fuel systems using pressure both Use Hig ley Heavy Hub Master Airscrew 10-6 prop up front lighter Zinger 10-6 wood pusher prop rear combina tion will give extra 3 oz up front counts Install electronics feeding anten nae back through upper lightening holes snaking out three holes left side just above stabilizer Flying single servo controls both throt tIes using Du-Bro EZ connector ca ble arrangement servo throttle linkage can independently adjusted Set front engine reliable idle high-trim position Low trim should cut engine Kill front engine set up aft engine same manner Setting up engines manner makes unlikely both can cut off precisely same time However pre sents no problem since engine should fail final approach go-around single engine readily made desired Its unnec essary synchronize engines just have both running well Its important aft fuel tank car ried high possible within tail sec tion use piece l-in-thick foam under tank Since engine pusher configu ration does have rain carburetor air tank location relation needle valve critical order avoid early starvation fuel level lowers small sheet metal scoop attached direct rain air carburetor throat Although worked ef ficiently carrying tank higher much less trouble equally effective Keep simple Note also rear tank clunk stalled forward position Having used clunk pickup both directions pushers Ive found forward installa tion satisfactory requires much less fuel line As aircraft having pusher propel lers special precautions must observed prevent debris going through Continued page 141 April 1989 137 1t I] iyu 111 E1ii RE SHOOTING DOWN HIGH BALSA PRICES WITH SUPER QUALITY Satisfaction Guaranteed Direct Only BALSA SHEETS 36 48 30 BALSA STICKS 3648 16233 332240 18243 316249 14256 132337 20337 163374931 33234458 37 1835471 45 31636282 55 14373 95 61 516395110 38355124 71 123110155 34 3165191 116455 7648 332470 9456 18 48010666 316493122 75 14411013484 38 4165225139 12 4225261 MATCHED SHEETS 42 3324100 164109 3164120 144131 116 14 116 36 116 12 332 14 332 35 332 12 18 18 18 14 18 36 18 12 316316 316 38 316 12 14 14 14 30 412 14 34 141 516516 3838 3812 3634 381 1212 1234 121 58 55 34 34 Os 10 14 10 12 16 08 11 12 18 11 17 22 16 19 21 34 40 21 27 32 42 52 36 46 56 48 67 16 18 24 16 20 30 24 26 30 44 55 28 37 46 55 70 53 62 78 66 90 BALSA HOT LINE Call 806 745 6394 10am 6pm Central Time BALSA TRIANOL ES 36 25 8830 35 45 55 BALSA PLANKS36 86 0 00 1480 1123275 1124360 22225 23325 24435 33495 34668 TAPERED SHEETS36 142 65 143 65 382 83 23120 LONE STAREPOXY 90L sI--S 95 5so598 iSoro598 38 rro598 CUSTOM CUT CONTEST BALSA Sheets Piece ed Close Tolerances AAA Grade Dried ped 100% a serious modeler want performance must try 4-6 lb balsa LIGHT 4-6 LB WOOD 1 32 3 1/203 1163 332 3 183 3 163 143 383 123 343 13 1 164 3 324 184 3164 144 384 124 36 53 53 53 63 77 89 104 122 158 242 335 83 100 115 133 158 236 322 TRAILING EDGE 36 14132 51611439 3811246 12270 INSTANTOLUE 1 o TSck 298 10 750 298 20 T5ck 550 20 150 550 BASSWOOD 316316 31614 31638 31612 31634 1414 1438 1434 3838 3/812 3634 12 1 2 1234 BUNDLE DEALS 28116336695 201164361035 20332 336865 15332 436955 151/8336738 101/8436895 15318336920 10316436835 1014336655 101/4436830 103/8336870 53/84 36655 51/2336540 5124361580 10-3324 48885 518448500 5316 4 48600 514448645 48*NEW* 26Hundreds 30 38 46 cessories 60 ishing 42 materials 80 60 #10 SASE 70 atest 90 catalog 100SPRUCE STICKS 3648 18 181725 18 142026 18 3/822 32 316316 28 38 14 3/84055 14 124585 3/8 3/84969 38 126577 12 I/O6688 12347597 SPRUCE TRIANGLES 38 38 12 1 2 34 34 1846 18412 146 HARD MAPLE 1 4 36 3838 38 12 3834 1 2 IRCH DOWELS 18 316 14 516 38 18 40 45 50 58 68 36 09 11 14 25 32 3PiVBIRCH48 16412620 13212445 11612455 1812485 SPLVBIRCH 48 33212588 1/812 625 36316 12625 4714 12828 8438 12725 8112 12900 LITE PLY 48GROOVED LGMOUNTS lllachea 15538341840 3153834/532140 2501234916/45 495 V. Push-Pull/Masters Continued page 137 prop author owned full-scale Lake Amphibian pusher years found protecting propeller loose nuts bolts fishing rods always major concern twin engine push-pull arrangement especially vulner able front prop can kick up stones starter cables wiping cloths etc promptly present rear prop digestion Flying twin pusher also requires special watchfulness flight Push-Pull 240 near-fiasco Immediately after takeoff carburetor aft engine came loose moved pusher prop promptly seif-destructed en gine full bore extremely unbalanced tore itself firewallbefore fuel starvation saved day whole scenario lasted about three four seconds pilot Ray Doan brought ship back single engine thorough preflight check would have spared pusher prop main thing remember get Push-Pull smoothly aloft advance throttles steadily during takeoff Ground control will positive no torque cor rection required Clinibout will solid watch slice through ether sound twin 40s something else Radio Technique/Myers Continued page 37 RC34 through RC37 vice versa 2 next condition change comes out mathematics frequencies coo Image interfer ence will return few SC455s Some folks will remember 7296 Y/W used image 7208 Bn/W Well SC455s RCll-14 RC57-60 can af fected Tx within band have local oscillator wrong side assume manufacturers simply wont sell SC455s channels Besides image coincides exactly Common Car rier Tx frequencies RC Tx helps Rx low LO have possibility imaging TV4 RC44 problem know love So see nothing simple cure above simple Use dual conversion Rx entry-level RC system almost always uses SC455 manufacturers will have narrow-band pay attention proper LO signments keep off RCll 12 13 14 34 35 36 37 57 58 59 60 Jim didnt mention channel doubt above manufacturers just arent selling Indirect Interference condition comes out numbers called Second Order Intermodulation Product Interfer ence 21M generated ANY PAIR Tx operating 23 RC channel numbers apart difference two frequencies modu lated 460 kHz signal often goes right through 5C455 detected interference Think 21M generated JUST ONE PAIR Tx might hit OWBAM SC45Ss SO channels simultaneously including own Rx depending signal strength Rx tenna RECEIVER CHARACTERIS TICS Nobody uses odd-numbered RC chan nels RCll 13 15 today dont see 21M Can predict what will happen give 25 odd-numbered channels another service Now remember discussing RE CEIVER problems assumption everyone already using Gold-stickered narrowband transmitters Practically Tx built since 1987 good enough warrant sticker easiest way avoid problems listed above use dual-conversion receiver dont have block out ANY channels Jim manufacturer offers best dual-conversion receivers market relatively cheap recommend letter appropriate person named end last months column narrow-band 5C455 can work cause interferences discussed above z off 455 kHz intermediate frequency IF dead like 31M Narrow-band SC455s exist example Bob Aberle recently tested Polks Pow ermax Merlin system receiver 5C455 RC46 its LO low side An IF bandwidth 6 dB 2 kllz claimed nothing quoted 85 kHz Merlin performance meets AMA guide lines except ins LO wrong side does use dual conversion DC outper formed 1991 DC system have tested ex cept its PCM computer slow April 1989 141 LONE STAR MODELS1412 1623 S7th St Lubbock TX 79412 cant 46 Handling charge pay UPS Add $250 COD $300 extra PP APO FPO StateS accept Vs4 Master Card personal checks COO 6% 368/n TenaS US crrency Mnmom Wood Order 51000
Edition: Model Aviation - 1989/04
Page Numbers: 24, 25, 26, 27, 28, 29, 30, 31, 32, 34, 35, 136, 137, 141
NO OCR TEXT NO OCR TEXT Left aft hatch hides 6-oz fuel tank tar rear engine natchlfin unit rejainca wuin trappea o-a aovw-neea oumi ana iwo O-J nylon screws Right Removing front hatch reveals plywood keeper holding two wing dowels place Under Sig canopy Williams Bros pilot ready go wing bolt covers made aluminum cigar wrappers have painted match Left simple onset tail wheel tiller lessens servo shock during ground operations Right Fiberglass cowls nice addition model difficult make 4-oz weight nose cowl helps balance aft cowl may omitted desired Fuselage Use piece A-in Lite Ply 12 wide 48 long Determine whether want separate fiberglass nose cowl built-up front engine compartment opt built-up style add 4 part labeled PS front FW plan Placing Lite Ply under fuselage side view locate end points straight lines pin pressed ply Con nect points using ball-point pen Hav ing basic lines straight makes easy work drawing sides curved sec tion wing saddle can traced few pieces carbon paper slipped between plan plywood Cut out PS sand down lines shown plan Trace second side first cutting sanding outline Clamp two sides togetheror socket-head bolts attachIng cowls can reached hex ball-driver hold together small pieces masking tapewhile block sand identical size errors tracing inevi table Make sure edges square 6 x 12-in piece /16 birch ply used nose doublers F4 Use FS template Make cutout section gear mount P3 Apply very thin coat 30-minute epoxy doubler P4 position FS making sure allow firewall FW Use weights clamps until ep oxy sets Make right left fuselage side asme Haico B106-8 strut Du-Bro axle K&S 062 aluminum clip hold rugged plywood-reinforced wheel pants place sembling its respective birch nose doubler Make two aft doublers Fl 1 attach thin layer epoxy Allow correct spacing aft fire wall FR two small doublers F6 can also attached using white glue suggested sides resanded en sure upper lower edges true identical sides placed inside surface faces up carefully draw locations Fl F2 F5 F6 F7 Make firewall FW laminating A-in birch ply Cut FR X6-in birch ply Draw horizontal vertical thrust lines both sides firewall will using engines different makes pick heaviest tractor front unit engine including muf 26 Model Aviation DESIGNED BY AL MASTERS IG WC 813 CRrJOPY FI0ERGLR ccWL--pwORKW OP&BOJTOM 3A6LA GOLD8ER%RLBR_ \\ /axBf4L N / 2 _____ NGL016 pIY IV 13~gW 3/ 15 pUI y8%Y I3R$A Qj 4EET 1~ 4 C ~RVY 2 Weigh wing spars determine two heaviest Place 01 heavy spars right panel other left fler attached its mount position firewall canting counterclockwise see front view Hold thrust line indicated allow muffler clearance proper carburetor location respect fuel tank Mark drill firewall stall four 6-32 blind nuts three tend use fiberglass cowl back side aft engine side mounted exhaust down standard mount such Dave Brown 4045 can used light weight variety shown plans engine should placed close FR possible still allowing clearance Tatone EM 4Oss manifold Lite Ply spac ers can used between FR mount mount arms longer neces NOTE FRONT ENUINE INSTALLATION-TUT CHORE FOR CORRECT LOCATiON OF EARNURETOR IN RELATION TO FUEL TANR ATTACM MOUNT TO FERWALL WETTI FOUR 14-32 T-MJTS N BOLTS LOWER MATCR CR LITE PLYF13 1-1 II lOOT UTE PLYII MUFPLER LUCATIONfl I504 RALSA TRISTUCO I/S PLY 4.BOTCH FUR MAPLE MOCR IIIII I/U RALSA TRI-OSUCI I/O PLTiiAjTj I ICONSTRUCTION 010 iT - - NOTE SERVO SHOWN FROMLM PLY SERVO TRAY ELEVATOR AILERONS IRUODEU I/O PLY WOOD I/H PLT IHEMUVAMLEI 6 ~ITEj I/lU PLYPUPLY WITH F-IS I/O CITE PLYHI/lU PLY14-02 TNUT 0101EV HEAVY---2~ ATCH -- OUR IOUZI -UIIBUZI AU TWO-CYCLEFAIrSUORO S-b TUSOIOU MALSA--H \iiiEAGNEII-V TUCKI IF BALANCE IFUAMI SERVO04 L PLY WITHOUT I 1CUSYRUL MASTER AIRSCSEYR 0-14RATT LYSUPPORT GOLORERO 2 SONNER\V- 0-SO ECE1YLR 11400 EI51 TROT--I IFLUM001CR VUNISE HEAVY WALL FIREROLASS COWLP13 IA PRAX 4 00 COMPLEVEUTE PLYHATCH HALCO BlUR-UI/H -005/4 ALUM ROLl 002 005 ALUMLASOINO SEAM H OTLUS SLYTIVI LANOINO OEAR CLIPLIURTEN RAND TU FIT/ ER PLYWOOD- I/O PLY lBALSAZi4IA OOR LITE ATTOEB WITH 004-40 NUTO BOLT TO.. 145O SERER/NAT EAO _FUSELAGI VI E 000140 040 REMOVE NOT FROM RALCO UEAR TAP FOR 001400 VOLE -GZYS 010 500 04 sary should cropped off save weight Use three 4-40 blind nuts bolts install mount Remove mounts before continuing fuselage con struction Cut remaining fuselage components materials specified Note Fl A-in birch ply includes switch cut out F12 F13 shown actual length plan can traced piece Left Fuselage parts Lite Ply sides bottom conjunction birch ply balsa keep weight distribution under control No tice two pre-formed balsa skin pieces fuselage side dou blers have already glued place Above Completed basic fuselage straight lines design signify easy layout 28 Model Aviation wing ribs Irst cut out witn construc tion tabs left provide easy method building necessary wing washout Full-Size Plans Page 188 F-I2oR LITE PLYAFT ENGINE MOUNT 1/H Lire PLY SPACER ID OH 4 REOHIREBI 141 HOLES TO WATCH L/2BALSAENGINE CASE THFSTOCHI/TDA WALSH -I 052 KS S--ATTACH TO F-fl WITH LS KS/B BALSAALABINOM131 4-40 T-NUTS S BOLTS BLOCK3/8 SOFT BALSA TAP FOR I/O-ZOkS/H 010 FIHEHOLASS COWLSPINNER -I -flE-KAF-Il III iCANOPT- COCKPIT AREA IAIII III I I _ -II __IIIII I I/ZBALSAI OW PL F-Nil I11 ...I II THFSTOCK HATCH TONGUE - I F-ri II 711 UiI i -----ZINOES 10 K Fl/A H-SO RH HALTEPOXYOx 3/4 BALSAPOSHEK PHOP TRAPPED E TOP VIEW EPOOTPSAS SYWAW'\I/B LITE PLY 1/1K PLY--.....WAKE I/H TM-STOCK I 3HBALSA0TRIBTO L~--IF-SROBART DOW F-SL_________IT-NOT K-D2 IEPOOTIOs HEMOVE FOR FOEL illiiiTANK ACCESS IIIII pF-6Ul II 04A IRE ORR IN PkASYIC ISO 121 SODA BALSA F-R 1540KF-fl T I-P/KS/IS PLYWOND Fl-Ia 3 I/2T ____ 2-I/H L 1/2 3-I/O 3/sO WOSIC WISE -1/1K PLYWOOR - R 156 50 040K lOSSO 1OYEW MWSOWER IAFTER UFE OP WITH 15K SQ BRASSASH TO SHAPE TUBENOTE RUBBERS AWE 0*EL A2EAEJaLI I42AALKZ2RN 125 50 BRASS _____I/U BALSA SHEETTUBE SHER MW HODDEK ISOFTISOLDEK - 'I/IHPLTWOOO I/H LITE PLY SPOCEKS 3/32 BALSA-NBLENO 3/32 I-D4 AlASHEET7AT WATER 2 TI -.LL/TUPTYHO FOR B52 NYLONFS SCREW 121 STABILIZEHi~ -1/1K PLYWOHO LS LITE PLY NOTE AFT EWAIRE COWL IS USHT WEIGUT- LAYER H DO LOATH PLUS LAYER 2 02 OLSON AFT EWAINE 500k ALL BATEHIAL MEDIUM BALSA ARLESS SPECIFIED OTHER Sb WC HID CANOPY RE-WORKEOI niN - FRAY F-7"HATCH BALSAII F-00F-B STOCK vzziU ALL LYBx 3/4I --. SOFT BALSA FILL F-HTIWVOKD/B.-24T1 ALSAI________ __________________-N I/ZBALSA F-Il 01 "CLuRK FOG THI-STOCK .----Io --STABILIZ VL SOALSOWALSA I/BBRLSA R-BLOCK SHEET I/O BALSA THI-STOCKF-6ALS PLC T AID- H HEOKIHEB~----4-40 BOLT-REROOC HEAD OR 1/H LITE PLY PLY N ESOAKS/AF-90TH 00 BALSA BALSABASIC WIRE IEf7iLSOFT BALSA PLYCLUMP N SLOE FILL --1SPECIFICAT IONS - SECT A SAWS WING SPUN HO COT OOT AFTER/550 AREA SQ 14 3/52 BALSA SHEETZNZATTASH AFT-PLYWOWOWEISHY IFUELEDI 9 LSC HDZ ASSES BLY IW PLYMAKE 2WISH LSAOINU OZ AIRFOIL.IH 7 SERI-SYM 34K BALSA SHEET L/$3JWITB WASHOUT POWER TWO 00 ENOIRED F-IaF- IF-S-HATCH2-CYCLE TeNUE F-H BLITE PLY 121 MODEL AVIATION PUSH-PULL 240 TWIN ENGINE R/C MODEL DESIGNED BY AL MASTERS TRACING BY JOE DEMARCO sanded correct outline cut apart finished components should include drawn centerlines aid lineup during sembly Cut lightening holes F12 af ter separating F13 Glue six con struction aids F12 Make preformed 3A2 balsa skin aft fuselage section will need some household ammonia cardboard tube approximately three-inch diameter core tube Christmas wrapping paper works fine Left The wing panel begins take shape has turned over show construction tabs Above bare bones horizontal tall show lightweight structure Because engine vi bration1 must rugged conventional model April 1989 29 upper rudder fitted square brass tube assembles lower rud der tall wheel hatch offers easy ac cess fuel tank supplying aft engine Wheel pants cut 1-in balsa block reinforced 1/-in birch ply carve nice streamline shape ex tra drag helps slow model down during landing model twin has frontal drag single-engine model finished nose cowl foam plug roughed-out aft cowl plug aft cowl can omitted front cowl adds 4 oz much needed nose weight lightweight aft engine mount used help get right CG Select two 7-in lengths /32 sheet 6-in-wide stock Trim balsa 5in width soak ammonia STABILIZERS/B SO BALSA LEADING LEFT STABILIZER STARRI PA CITE PLY BEFORE I/B lI/A BALSA~OsA SEE SHEET RIBS ORE OBOESTRISTOCK VBx I/A BALSA RIB SUPPORT I2OBALS S/IHZ I/OFiLL BALSAJ 7BABORT3OBI/OSA HOBOij BALSA SPAR CSCRAP BALSA 01 I/Bx I/O BIB SUPTS015 ALA /1/ AOR PETLOWER SURFASE INSET / 3/0 SOFT BALSA SHEET S/TOZZRALSASHLfl IBS-SAEETI NOT SBOSAN OR LEFT / ROSA SARIS1/5 50 OARS 3/32 SCRAPTA CONTOURBALSA BALSA RIBSvO BALSA SHEET BATE TRIAL FIT STAR TO VFOSELAAE BEFORE ATTACRIRS VA SO BALSA I FILLELEV-STAB SECTI LVI I/A BALSA I COVERING STAB IIAVA SCREAj~ PUT 7ORILL FOR ipL5/32 B BI I/A BALSA LEASISS OIS ALUMEASEy 0/01122n-p-iiBALSA /_____UWING ____ I_ ~1I _____ PLAN TOP VIEW _______I BALSASBIItZ BALSA 5/52 BALSAI I/B xl BALSA LE3/Az OBEET RIRIO V4x S/B I/B I/O BALSABALSA SOB LEABISA EPSEI/H BALSA2 RISER 5PM SHEETWITHOUT CAP S/SO RALSAVA 120BALSA WISE SHEETINGSPARS 5/52 BALSA least five minutes Blot wood pa per towel wrap around tube using masking tape hold place Set balsa skin aside allow air dry thor oughly Save ammonia another proj ect Begin assembling fuselage over top view plan Support sides up right glue firewall place using F5 spacer Use white glue since will allow time lining everything up Place weight such ordinary brick top front edges fuselage sides clamp FW place pull aft fuselage section together time lower fuselage line forward F5 straight weight will keep setup square work surface until glue sets Attach FR using white glue 10-minute epoxy aid clamp Hold sides together attach F6 cyanoac rylate CyA Add two 14 x %-in crosspieces fit Fl 1 Check position WINO L DIHEDRAL DETAIL NOT SCALE F5 tack CyA Make relief notches Fl clear blind nuts back side FW Force Fl position will aid correcting misalignment front firewall F5 attach CyA Install /6 x A-in hardwood servo rails make servo tray A-in ply fit After gluing F3 place set fuselage asideyoull com pleting laterand proceed wing Wing Trace cut set ribs using pattern make second set Fin ish sand ribs pairs draw chord lines shown both sides rib Cut dihedral braces draw two centerlines indicated both sides leading edge brace Cover wing plan wax paper plastic film before pro ceeding Cut four straight x A-in balsa spars length point weigh four pieces distribute spars avoid using LS 1122 SUB LEAGIRS EDGE 30 Model Aviation Due heavy side loads engine weight necessary use birch ply hardwood lower tail post system Note soldered upper lower torque rods Full-Size Plans Available Page 188 I/B BALSA REMOVE FOR SERVOSMEET IFI 2 Q1 — U AILERON SERVO-L SOFO RULVA- 01 LI lb 0I RALSA OREET IOFT ALSA SO EDGE S/IA DIA DOWELS WINO SOLO SOWN I] NOTE BIBS 2 TRRU 12 ABE 5/32 BALSA SHEET 3 [I 45678910II12 111 II r I OR BALSA SHEET WISH YIP FRAMES I/R PLVWDODV UPPERI/R PLYWOOD_______ I/R LITE PLO1QWiR t __ LEADING EDGE VA PLYWOOD S/DO RALSA SHEET TVP H BOVVOMjSERVO DOONYDIHEDRABRACESWING TIP DETAIL HAL NA S/HI/O /0 BALSA1II______ 71 FILLHOII WINO BOLT PLY4 ACCESS I/O BALSA SUBEE -PUSHPULL 240 3/BR I/O OIL STOCHL --TWIN ENGINE R/C MODEL RI LIGHTENINS ROLES ISV BTA FUSELAGEI/IS BALSA SHEETDESIGNED BY AL MASTERS SIDEBATH SIDESWORK SURFACE I254NTRACING BY OE DEMARCO IIIII ALL RIGHTS RESERVED FILL ISO MUSIC IKE EPOOVI / I/B BRASS TUBE EPOXY TO OK aileron servo carried well forward wing Z-bends A-ln music wire pushrods used connect servo Arm II I-V117j4I TRI-STOCEILIli-TiI #~p Iftv 11-----S I/B LIVEF4[~SRWVAII DLV April 1989 31 receiver battery pack three servos nestled lower nose section below 12oz front fuel tank dual take-offs 5-26 servo controls throttles both engines Left Both K&B 40 05 4OFP have used tor tne aft engine witn equal success Lite Ply spacers firewall provide clearance Tatone manifold Right fuel tank nose compartment sealed keep fuel leaking electronics below two heaviest same wing panel postal scale coding used Glue lower ply dihedral brace spar halves position spar over plan securing pins weights Position ribs 1 through 12 spar making sure construction tabs resting work surface x %-in trailing edge x /2-in leading edge pinned place ribs aid lineup space between ribs 1 2 pro vides leading edge brace will slipped later After making sure ribs perpen dicular work surface CyA ribs spar leading edge trailing edge Fit upper spar glue place Block sand upper surface trailing edge slightly follow rib contours Select four sheets %2 balsa 2-in stock upper lower trailing edge skins Check weights using two heaviest opposite panels Hold metal yardstick edgewise across ribs board sheet edge certain sheet line will straight attached ribs high rib can carefully sanded down dont worry about low rib point Turn wing over Using piece wood such ruler press wing down ward contact %2 sheet bond ribs CyA Work about three ribs time starting rib 1 skipping low ribs Maintaining straight sheet line out waves important gluing rib chip A-in triangle stock can used support skin low rib cap strips added later will hide multi tude construction errors Build wing tip attach rib 12 Center tip rib chord line leading edge 4 x %-in trailing edge balsa filler trailing edge tip will allow block sanding fit con tours %2 sheet aileron Attach tip webs will final sanded after rib caps place Add four hinge supports vertical-grain %2 spar webs between ribs 3 12 Fit rib iF place panel inch off work surface rib 12 set iF perpendicular work surface glue trailing edge spar notch tack gluing leading edge Note iF shown actual length plan reaches leading edge strip Allow space spar notches fit dihedral brace mating spars later Set panel aside construct oppo site panel similar manner completed second panel work surface fit two panels together El evate first panel 2 per draw ing push lower spars together until butt Slightly bevel spar end ob tain good fit upper dihedral brace slipped alongside upper spars clamped using least two clamps side wing centerline Make sure %-in dihedral brace fits flush slightly below spars sanding down later will difficult Add leading edge ply brace clamping same manner Rib iF will have razor sawed shorter Make sure horizontal centerline leading edge di hedral brace located correctly ribs 1 2 both panels bottom edge of servo mount sec Continued page 34 32 Model Aviation finished model resting authors balancing rack Location correct cxi shoula always determined model before making first trip out flying field idea RC Push-Pull 240 came WW Ii Dornier-335 Reported worlds fastest propeller-driven aircraft its time war ended before could made operational youve ever fuel tank split leak fuel fuselage know important install tank can trust Du-Bro Products manufactures complete line rugged polypropylene tanks 10 convenient sizes 2oz 24 oz guaranteed life against splitting leaking money back tank comes complete soft brass tubing hardware Protruding front lip prevents fuel lines being crimped hard landings Single twin vent design gas conversion stopper available use tank gasoline Cat No 400 Visit local Hobby Shop fuel hook up accessories can Cap Fittings In-Line Fuel Filter 0 Fuel Tubing Kwik Fill Fuel Value Gas Gb Fuel Tank Filter KwkF Fue Pump tion should parallel work sur face wing level upper spar leading edge clamped rear section wing panels butted trailing edge make final check spars run straight tip tip Hit ar eas CyA Carefully turn wing over clamp lower dihedral brace two clamps CyA Add four 3A-in triangle braces ribs 1 2 Complete center section shear webbing cut off con struction tabs Add balsa filler blocks trailing edge bays between ribs 1 iF Carve notch bottom iF accept W2 Install latter gluing flush bottom rib 1 Remove section iF accommodate aileron servo location Wl can shifted neces sary allow space aileron servo stall Wi add A-in triangles support W2 upper lower leading edge sheets attached /16 overhang leadmg edges Wetting outside surface sheets will make forming easier sheet edges will block sanded until leading edge provide flat gluing surface x 1-in leading edge cap Fasten -in -thick scrap spacer along leading edge masking tape Place wing fuselage check saddle area fit Remove wing epoxy hardwood hold-down blocks place temporary x -in cross brace glued near blocks fuselage side support epoxy has cured align wing fuselage hold place masking tape Drill through W2 hardwood blocks Y6 bit held perpen dicular W2 Remove wing re drill W2 A-in bit Tap blocks A-20 wing bolts Bolt wing place drill two s through F5 leading edge Wi Trial fit two /, dowels shown plan Use soft balsa foam filler around the wing bolt holes sanding down center section top sheeting Remove dowls complete wing sheeting rib caps leading edge cap Drill through leading edge cap /16 bit two dowels epoxied after wing has covered Ailerons Cut two aileron cores 3/ x 1-in aileron stock After making lightening holes cover ailerons /l6 sheet balsa Drill four holes hinge pins 1-in bit drill %2 hole torque rod Transfer hinge locations wing drill Trial fit ailerons hinge pins /2 torque rod assemblies alignment correct epoxy brass tubes onto wing trailing edge Remove ailerons final sanding covering Fuselage-wing assembly rmal fuse lage construction Razor saw two slots 34 Model Aviation top F5 sand accept wing dowels make /6 drilled holes oversized dowels inserted bolt wing place Lay small piece wood across top dowels trace its lower edge line location F5 Move down /16 below line just made fit piece A-in ply between dowel holes epoxy F5 Epoxy 3A-in triangle brace under ply Drill /16 hole center through ply tap A-20 bolt Treat hole CyA A-in ply wing hold-down has A-in drilled hole see drawing detail Cut two fuselage trim pieces / x % x 15 long medium-hard balsa Glue top FS extend yond FR about 4 dont glue beyond F7 Make /16 notch trim piece allow pulled together slightly behind FR secured rub berband tape Slip piece wax paper between FR FlO clamp FlO FR Glue FlO trim pieces being careful bond latter FS Cut piece x M-in balsa width F7A Add /16 ply top drill 140 hole #27 bit shown Glue x s-in piece top trim piec es F7 Glue F7A top crosspiece after fitting over /16 ply stall 1 A-in-long 6-32 socket-head bolt washer through 140 hole Use small piece tape keep bolt fall ing out Trim section preformed %2 skin fit between F7 FR overlapping both slight ly Sand bottom edges theyre alignment top trim pieces mate F7A FlO CyA skin trim pieces Aft hatch Razor saw remove aft ex tensions trim pieces cut through F7 Remove hatch section com plete application CyA F7A FlO piece plastic soda straw epoxied place will keep 6-32 bolt trapped Sand %2 skin flush F7A Install F8 F9 through slots cut formed skin Small pieces triangle stock add final rigidity unit Complete hatch front hold-down placing piece /16 ply 6-32 blind nut under two x 3A-in fuselage crosspieces Line up hatch snug up 632 bolt Use Du-Bro ball wrench inserted through small hole skin CyA ply place remove hatch epoxy ply cross members two /16 ply aft hold-down tongues installed follows Shave off excess material inside hatch trim piec es 6-32 bolt masking tape rear holding hatch place work through opening fuselage bottom Position ply tongues tack CyA F9 %2 sheet bond FS Remove hatch ep oxy tongues Again bolt hatch secure Continued page 136 EffectiveJanuary 1989 Fox motors except Combat supplied muffien some time have using soft sell approach columns customers direct some excerpts letters have received Eric larson Pine Grove CA Fox Mfq Yesterday bought Fox 4OBB Delux thefirst Fox engine have owned some apprehension bought anything other OS engine have burned before buying off brand engines Today am convened Fox 40 40SF similar both start idle magnfkenrly cant tell dfference power thats similarities end Fox 40 vibrates less easier adjust lighter comes great spinner costs hoff much American made hove now made sure everyone myflying club knovs what great buy Fox engines THANK YOU FOR QUALITY PRODUCT Eric Branham Paris IL r purchasing 40 Delux year lam impressed performs exceptional lot better OS Are planning replace Eagle III update 60 size will assured will first line purchase Jon Armitage Indiana PA ed send letter praise about motors motors used flew C/L FE started RC about year ago decided try Super Tiger 25 0S4 Stroke 40 good came bock Fox power quality handling allot decent price engines popular field Will Sgarlat Cape Cod MA note tbonksfor youve donefor wonde4izl hobby yourflne engines Dukes Mixture column temfic service offer us accidentally smash up Fox engines beyond what theyd care tackle repair Westley Keller Gouster OH have meaning drop linefor some time 40 motor trouble replaced put icing cake will never run anything planes unless says Fox side performance service says subject Decals present time am running 8 Fox engines am requesting Decals accordingly Alse lam lookingforsvard coming Eagle 4 Keep going best engines world Barry Doughty Absecon NJ placed old OS Max 60 Clipped Wing Cub Top Elite new Fox SOBA WOW what engine no vibration started right out box no adjustments Idled good accelerarionfrom idle full bock reenfic Weight bigfactor purchasing SOBBRC lighter OS SuperTigre Come etc Also must add replacement parts economical foreign imports Coming landing motor idled down beautifully settled infor great landing Again engine something else loads power very easy onfuelfor SO size engine John Holder Ob Seeverson AL ne obviously drfective else would have pulled wings off Aerostor 40 Seriously very pleased myfirse Fox engine Vaughn Kempf Modern Hobbies Miles City MI wanted take afew minutes send afew wards praise way talked three customers buying Fox 4OBB Delux motors quite impressed motors have couple observations pass along First havefound performancefigures seem little conservative modest measuring 14000 plus Master Airscrew 10 x 6 props using Royol Pro Tachfor readings Idle lower other 40 Ive ever ron realiable during spins soaps inverted idling Kenneth Wilson Schenectady NY know lam loyal satisfied Fox engine user over years Ive owned U/C 36 Fox R/C engines such Fox 2S early Fox 40 Eagle III currently own 2 Eagle Ills must compliment quality value youve designed built Fox engines Corey Wills Perryville MO compliment having thefinest engines made Several myfriends have flying Fosfor past three orfour years wouldnt give up other engine somewhat higher prices lately still cant beat affordability reliability performance Doc Matthess Wichita KS drop note express pleasure over engine Fox 45 Excellent midrange easy start set super neat spinner set up andfinally sofe incredible power larry Maltman Winnipeg Canada k kindlyfor promptly courteouslyfilling last order appreriate excellent service seems todays hurried ways few businesses take time what just seemed naturalfor Fox Mfg Ca have active builder/flyer since 1962 Myflest Fox engine reliable durable lam also happy state additional 17 Fox engines have purchased since 1962 running reliably consistently lester Goldsmith Action Hobbies Memphis IN riting tell Fox 60 Heli Engine has cranked run flawlessly rightfrom start Enclosed pictures Schluter Scout 60 1 did test run engine before installing believe really necessary because just cranked Fox 45 Heli today new unrun except byyourfacroryj new Schluter Junior though test run too cronked ran immediately idled perfectly very smooth believe word getting around Fox best buys now because compression al ways good making starting good power output always above average tops confirmed test articles magazines Life always goad because appear cut corners importantfeatures such bushed conn rods grades material Ruts always hand tap factory service unmatched anysvhere Eugene Mathis Daphne AL Fox 4OBB out Clubfleld last Saturday kicked tires lit thefires took off leaned bit andflight number twa went whole tank really started come Flight 3 very spectacular pulling vertical stall turn Ifinally throttle off hung prop just kept going veritable hoss because Kaos 40 weighs ran Walter Pawlukanis Oakhurst NJ normally write manufacturers anyone else asfar goes matter offact cant remember wrote last However am really impressed Fox 4OBB Delux WOW what engine have mounted 40 size Ugly Stik type airplane about 2-1/2 gals offuel through irsofar Eyes popping started right up required some hi 5 peed adjustment Since until now has gotten better better Vertical performance just doesnt quit ttle response certain sure Im willing wager bet money its certainty AlMancini las Angeles CA te thank youfor incredibly fast turn around phone order Onward Upward Andy Keeley Memphis IN ht Eagle III put 6-1/2 pound airplane next day flyingfield great airplane vertical performance needed Thank great engine also like Dukes Mixture Model Airplane News Happy Flying Manufacturing Company 5305 Towson Avenue Fort Smith AR 72901 Phone 501 646-1856 April 1989 35 Freebees available time new color catalog new price sheets parts sheersfor 1988 1989 model motors wauld appreciate receiving seffaddressed envelape twa stamps however masking tape rear Drill through sides tongues #29 bit 136 tap 8-32 nylon screws Replace fit hatch Sand Y32 skin flush FR Fit forward section formed sheet glue place hatch place shave sand trim pieces shape F6 aft FS Cowls nose cowl adds needed weight attaining correct center-of-gravity aft cowl merely cosmetic lost foam method can used make fi berglass cowls Styrofoam forms made undersized allow cowl wall thick ness Use batches Hobbypoxy 2 four layers 6-oz cloth strips nose cowl aft cowl takes layer same size strips Add final layer 2oz cloth both units After epoxy has set gouge out foam use acetone remove resi due ply cowl mounts installed last epoxy strips fiberglass cloth nose cowl should have final weight 4 oz Use hex ball-driver reach hid den socket-head bolts use extended sides FS shaped balsa blocks instead glass nose cowl may need add nose weight correct centerofgravity Empennage Its important build sta bilizer light strong aft engine right trying shake apart Build main frame flat over plan protected wax paper Notch tip pieces R-in-sq hard balsa spar Add 10 rib supports hinge blocks Dont forget A6 ply trailing edge doubler Trial fit frame fuselage Posi tion A-in-sq balsa inboard ribs hug fuselage sides sanding ribs ap propriate contour procedure allows unit covered prior attachment fuselage Add remaining ribs fit four A-in vertical-grain braces will epoxied place after stabilizer has covered attached Assemble elevators /I6 dowel block sand shape 015 alumi num support formed around dowel Build upper lower fins associated rudders upper rudder has groove its lower edge accept Y32 wire torque rod Fit upper fin place over F8 F9 lower fin tail post A-in birch ply predrilled A-in bit hinge point Make lower fin including /16 ply bearing piece %2-in hole lower torque rod trailing edge fin clamped glued after hard wood block formed tail wheel wire has glued place Add soft balsa filler set aside Rudder torque rods make upper torque rod start cutting two pieces % music wire making 2 sec ond 4/2 long Make 900 bend 1 end Solder -in sec tion K&S 125-in-sq brass tubing its end 3A-in leg Allow no solder outside brass part Tinning wire first sweat ing brass wire makes nice neat job Make upper torque rod Solder /2in piece 125-in-sq brass tubing onto end 1-in leg 2%-in piece 156-in-sq brass tubing slipped over 125 tubing ered Lay upper lower torque reds flat board relative positions Assem ble lower tube upper tube telescope mating parts one-fourth inch Tackle upper wire assembly soldering iron remelting upper joints applying very light pressure both 900 arms resting flat sur face arms will now lined up parts assembled specified before remelting lineup risk fusing whole assembly making un usable Telescope two parts checking ease fit dimensions Assembling covering Finish fuse136 Model Aviation ELECTRIC SEMI-SCALE Radio Control Sport/Trainer Wing Span 67 3/4 Length 37 1/2 EIII see Local DeCirn PAUL K GUILLOW INC WAKEFIELD MA 01880 Push-Pull/Masters Continued page 35 lage assembly fitting top batch canopy area sealing front fuel tank area epoxy Fl P2 provide fueltight compartment protect electronics carried below Assemble controls sup porting necessary Add triangle stock close up compartment F13 Cut lower hatch provide retaining Attach Halco strut four 4-20 aluminum bolts plastic nuts wheel pants sawed 4 x 12-in balsa block thick Reinforce A-in birch ply Resist tempta tion carve sand wheel pants nice streamlined shape need cer tain heft order contribute drag land ing time Remember although two engines idle frontal drag area single engine After final sanding vacuuming free dust cover individual parts favor ite material Coat both firewalls epoxy inside out covering stabilizer leave bottom center section open Position stab attach CyA checking align ment carefully Pass lower torque rod through /I6 ply bearing Fit lower fin slot F12 clamp lower tail post A-in Lite Ply fuselage cross brace Square up epoxy fm leading edge inside fuselage Attach A-in ply lower tail post A-in Lite Ply cross brace using CyA Glue four vertical-grain A-in braces stabi lizer fuselage sides Close up stab center section Push lower rudder over torque rod epoxied hinge point Make sure treat center hinge point pe troleum jelly expect hinge action af ter epoxy cures Angle upper torque rod position through its ply bearing join two torque rods Fit aft hatch place bolt Assemble upper rudder its hinge point Line up two rudders epoxy upper torque rod groove bottom rudder Install elevators attach 015in aluminum support aft firewall two No 2 screws Secure tail wheel tiller loop lower rudder small rubberband bound tightly possible tail wheel off set rudder pushrod undersize minimize servo shock engines place pipe up fuel systems using pressure both Use Hig ley Heavy Hub Master Airscrew 10-6 prop up front lighter Zinger 10-6 wood pusher prop rear combina tion will give extra 3 oz up front counts Install electronics feeding anten nae back through upper lightening holes snaking out three holes left side just above stabilizer Flying single servo controls both throt tIes using Du-Bro EZ connector ca ble arrangement servo throttle linkage can independently adjusted Set front engine reliable idle high-trim position Low trim should cut engine Kill front engine set up aft engine same manner Setting up engines manner makes unlikely both can cut off precisely same time However pre sents no problem since engine should fail final approach go-around single engine readily made desired Its unnec essary synchronize engines just have both running well Its important aft fuel tank car ried high possible within tail sec tion use piece l-in-thick foam under tank Since engine pusher configu ration does have rain carburetor air tank location relation needle valve critical order avoid early starvation fuel level lowers small sheet metal scoop attached direct rain air carburetor throat Although worked ef ficiently carrying tank higher much less trouble equally effective Keep simple Note also rear tank clunk stalled forward position Having used clunk pickup both directions pushers Ive found forward installa tion satisfactory requires much less fuel line As aircraft having pusher propel lers special precautions must observed prevent debris going through Continued page 141 April 1989 137 1t I] iyu 111 E1ii RE SHOOTING DOWN HIGH BALSA PRICES WITH SUPER QUALITY Satisfaction Guaranteed Direct Only BALSA SHEETS 36 48 30 BALSA STICKS 3648 16233 332240 18243 316249 14256 132337 20337 163374931 33234458 37 1835471 45 31636282 55 14373 95 61 516395110 38355124 71 123110155 34 3165191 116455 7648 332470 9456 18 48010666 316493122 75 14411013484 38 4165225139 12 4225261 MATCHED SHEETS 42 3324100 164109 3164120 144131 116 14 116 36 116 12 332 14 332 35 332 12 18 18 18 14 18 36 18 12 316316 316 38 316 12 14 14 14 30 412 14 34 141 516516 3838 3812 3634 381 1212 1234 121 58 55 34 34 Os 10 14 10 12 16 08 11 12 18 11 17 22 16 19 21 34 40 21 27 32 42 52 36 46 56 48 67 16 18 24 16 20 30 24 26 30 44 55 28 37 46 55 70 53 62 78 66 90 BALSA HOT LINE Call 806 745 6394 10am 6pm Central Time BALSA TRIANOL ES 36 25 8830 35 45 55 BALSA PLANKS36 86 0 00 1480 1123275 1124360 22225 23325 24435 33495 34668 TAPERED SHEETS36 142 65 143 65 382 83 23120 LONE STAREPOXY 90L sI--S 95 5so598 iSoro598 38 rro598 CUSTOM CUT CONTEST BALSA Sheets Piece ed Close Tolerances AAA Grade Dried ped 100% a serious modeler want performance must try 4-6 lb balsa LIGHT 4-6 LB WOOD 1 32 3 1/203 1163 332 3 183 3 163 143 383 123 343 13 1 164 3 324 184 3164 144 384 124 36 53 53 53 63 77 89 104 122 158 242 335 83 100 115 133 158 236 322 TRAILING EDGE 36 14132 51611439 3811246 12270 INSTANTOLUE 1 o TSck 298 10 750 298 20 T5ck 550 20 150 550 BASSWOOD 316316 31614 31638 31612 31634 1414 1438 1434 3838 3/812 3634 12 1 2 1234 BUNDLE DEALS 28116336695 201164361035 20332 336865 15332 436955 151/8336738 101/8436895 15318336920 10316436835 1014336655 101/4436830 103/8336870 53/84 36655 51/2336540 5124361580 10-3324 48885 518448500 5316 4 48600 514448645 48*NEW* 26Hundreds 30 38 46 cessories 60 ishing 42 materials 80 60 #10 SASE 70 atest 90 catalog 100SPRUCE STICKS 3648 18 181725 18 142026 18 3/822 32 316316 28 38 14 3/84055 14 124585 3/8 3/84969 38 126577 12 I/O6688 12347597 SPRUCE TRIANGLES 38 38 12 1 2 34 34 1846 18412 146 HARD MAPLE 1 4 36 3838 38 12 3834 1 2 IRCH DOWELS 18 316 14 516 38 18 40 45 50 58 68 36 09 11 14 25 32 3PiVBIRCH48 16412620 13212445 11612455 1812485 SPLVBIRCH 48 33212588 1/812 625 36316 12625 4714 12828 8438 12725 8112 12900 LITE PLY 48GROOVED LGMOUNTS lllachea 15538341840 3153834/532140 2501234916/45 495 V. Push-Pull/Masters Continued page 137 prop author owned full-scale Lake Amphibian pusher years found protecting propeller loose nuts bolts fishing rods always major concern twin engine push-pull arrangement especially vulner able front prop can kick up stones starter cables wiping cloths etc promptly present rear prop digestion Flying twin pusher also requires special watchfulness flight Push-Pull 240 near-fiasco Immediately after takeoff carburetor aft engine came loose moved pusher prop promptly seif-destructed en gine full bore extremely unbalanced tore itself firewallbefore fuel starvation saved day whole scenario lasted about three four seconds pilot Ray Doan brought ship back single engine thorough preflight check would have spared pusher prop main thing remember get Push-Pull smoothly aloft advance throttles steadily during takeoff Ground control will positive no torque cor rection required Clinibout will solid watch slice through ether sound twin 40s something else Radio Technique/Myers Continued page 37 RC34 through RC37 vice versa 2 next condition change comes out mathematics frequencies coo Image interfer ence will return few SC455s Some folks will remember 7296 Y/W used image 7208 Bn/W Well SC455s RCll-14 RC57-60 can af fected Tx within band have local oscillator wrong side assume manufacturers simply wont sell SC455s channels Besides image coincides exactly Common Car rier Tx frequencies RC Tx helps Rx low LO have possibility imaging TV4 RC44 problem know love So see nothing simple cure above simple Use dual conversion Rx entry-level RC system almost always uses SC455 manufacturers will have narrow-band pay attention proper LO signments keep off RCll 12 13 14 34 35 36 37 57 58 59 60 Jim didnt mention channel doubt above manufacturers just arent selling Indirect Interference condition comes out numbers called Second Order Intermodulation Product Interfer ence 21M generated ANY PAIR Tx operating 23 RC channel numbers apart difference two frequencies modu lated 460 kHz signal often goes right through 5C455 detected interference Think 21M generated JUST ONE PAIR Tx might hit OWBAM SC45Ss SO channels simultaneously including own Rx depending signal strength Rx tenna RECEIVER CHARACTERIS TICS Nobody uses odd-numbered RC chan nels RCll 13 15 today dont see 21M Can predict what will happen give 25 odd-numbered channels another service Now remember discussing RE CEIVER problems assumption everyone already using Gold-stickered narrowband transmitters Practically Tx built since 1987 good enough warrant sticker easiest way avoid problems listed above use dual-conversion receiver dont have block out ANY channels Jim manufacturer offers best dual-conversion receivers market relatively cheap recommend letter appropriate person named end last months column narrow-band 5C455 can work cause interferences discussed above z off 455 kHz intermediate frequency IF dead like 31M Narrow-band SC455s exist example Bob Aberle recently tested Polks Pow ermax Merlin system receiver 5C455 RC46 its LO low side An IF bandwidth 6 dB 2 kllz claimed nothing quoted 85 kHz Merlin performance meets AMA guide lines except ins LO wrong side does use dual conversion DC outper formed 1991 DC system have tested ex cept its PCM computer slow April 1989 141 LONE STAR MODELS1412 1623 S7th St Lubbock TX 79412 cant 46 Handling charge pay UPS Add $250 COD $300 extra PP APO FPO StateS accept Vs4 Master Card personal checks COO 6% 368/n TenaS US crrency Mnmom Wood Order 51000
Edition: Model Aviation - 1989/04
Page Numbers: 24, 25, 26, 27, 28, 29, 30, 31, 32, 34, 35, 136, 137, 141
NO OCR TEXT NO OCR TEXT Left aft hatch hides 6-oz fuel tank tar rear engine natchlfin unit rejainca wuin trappea o-a aovw-neea oumi ana iwo O-J nylon screws Right Removing front hatch reveals plywood keeper holding two wing dowels place Under Sig canopy Williams Bros pilot ready go wing bolt covers made aluminum cigar wrappers have painted match Left simple onset tail wheel tiller lessens servo shock during ground operations Right Fiberglass cowls nice addition model difficult make 4-oz weight nose cowl helps balance aft cowl may omitted desired Fuselage Use piece A-in Lite Ply 12 wide 48 long Determine whether want separate fiberglass nose cowl built-up front engine compartment opt built-up style add 4 part labeled PS front FW plan Placing Lite Ply under fuselage side view locate end points straight lines pin pressed ply Con nect points using ball-point pen Hav ing basic lines straight makes easy work drawing sides curved sec tion wing saddle can traced few pieces carbon paper slipped between plan plywood Cut out PS sand down lines shown plan Trace second side first cutting sanding outline Clamp two sides togetheror socket-head bolts attachIng cowls can reached hex ball-driver hold together small pieces masking tapewhile block sand identical size errors tracing inevi table Make sure edges square 6 x 12-in piece /16 birch ply used nose doublers F4 Use FS template Make cutout section gear mount P3 Apply very thin coat 30-minute epoxy doubler P4 position FS making sure allow firewall FW Use weights clamps until ep oxy sets Make right left fuselage side asme Haico B106-8 strut Du-Bro axle K&S 062 aluminum clip hold rugged plywood-reinforced wheel pants place sembling its respective birch nose doubler Make two aft doublers Fl 1 attach thin layer epoxy Allow correct spacing aft fire wall FR two small doublers F6 can also attached using white glue suggested sides resanded en sure upper lower edges true identical sides placed inside surface faces up carefully draw locations Fl F2 F5 F6 F7 Make firewall FW laminating A-in birch ply Cut FR X6-in birch ply Draw horizontal vertical thrust lines both sides firewall will using engines different makes pick heaviest tractor front unit engine including muf 26 Model Aviation DESIGNED BY AL MASTERS IG WC 813 CRrJOPY FI0ERGLR ccWL--pwORKW OP&BOJTOM 3A6LA GOLD8ER%RLBR_ \\ /axBf4L N / 2 _____ NGL016 pIY IV 13~gW 3/ 15 pUI y8%Y I3R$A Qj 4EET 1~ 4 C ~RVY 2 Weigh wing spars determine two heaviest Place 01 heavy spars right panel other left fler attached its mount position firewall canting counterclockwise see front view Hold thrust line indicated allow muffler clearance proper carburetor location respect fuel tank Mark drill firewall stall four 6-32 blind nuts three tend use fiberglass cowl back side aft engine side mounted exhaust down standard mount such Dave Brown 4045 can used light weight variety shown plans engine should placed close FR possible still allowing clearance Tatone EM 4Oss manifold Lite Ply spac ers can used between FR mount mount arms longer neces NOTE FRONT ENUINE INSTALLATION-TUT CHORE FOR CORRECT LOCATiON OF EARNURETOR IN RELATION TO FUEL TANR ATTACM MOUNT TO FERWALL WETTI FOUR 14-32 T-MJTS N BOLTS LOWER MATCR CR LITE PLYF13 1-1 II lOOT UTE PLYII MUFPLER LUCATIONfl I504 RALSA TRISTUCO I/S PLY 4.BOTCH FUR MAPLE MOCR IIIII I/U RALSA TRI-OSUCI I/O PLTiiAjTj I ICONSTRUCTION 010 iT - - NOTE SERVO SHOWN FROMLM PLY SERVO TRAY ELEVATOR AILERONS IRUODEU I/O PLY WOOD I/H PLT IHEMUVAMLEI 6 ~ITEj I/lU PLYPUPLY WITH F-IS I/O CITE PLYHI/lU PLY14-02 TNUT 0101EV HEAVY---2~ ATCH -- OUR IOUZI -UIIBUZI AU TWO-CYCLEFAIrSUORO S-b TUSOIOU MALSA--H \iiiEAGNEII-V TUCKI IF BALANCE IFUAMI SERVO04 L PLY WITHOUT I 1CUSYRUL MASTER AIRSCSEYR 0-14RATT LYSUPPORT GOLORERO 2 SONNER\V- 0-SO ECE1YLR 11400 EI51 TROT--I IFLUM001CR VUNISE HEAVY WALL FIREROLASS COWLP13 IA PRAX 4 00 COMPLEVEUTE PLYHATCH HALCO BlUR-UI/H -005/4 ALUM ROLl 002 005 ALUMLASOINO SEAM H OTLUS SLYTIVI LANOINO OEAR CLIPLIURTEN RAND TU FIT/ ER PLYWOOD- I/O PLY lBALSAZi4IA OOR LITE ATTOEB WITH 004-40 NUTO BOLT TO.. 145O SERER/NAT EAO _FUSELAGI VI E 000140 040 REMOVE NOT FROM RALCO UEAR TAP FOR 001400 VOLE -GZYS 010 500 04 sary should cropped off save weight Use three 4-40 blind nuts bolts install mount Remove mounts before continuing fuselage con struction Cut remaining fuselage components materials specified Note Fl A-in birch ply includes switch cut out F12 F13 shown actual length plan can traced piece Left Fuselage parts Lite Ply sides bottom conjunction birch ply balsa keep weight distribution under control No tice two pre-formed balsa skin pieces fuselage side dou blers have already glued place Above Completed basic fuselage straight lines design signify easy layout 28 Model Aviation wing ribs Irst cut out witn construc tion tabs left provide easy method building necessary wing washout Full-Size Plans Page 188 F-I2oR LITE PLYAFT ENGINE MOUNT 1/H Lire PLY SPACER ID OH 4 REOHIREBI 141 HOLES TO WATCH L/2BALSAENGINE CASE THFSTOCHI/TDA WALSH -I 052 KS S--ATTACH TO F-fl WITH LS KS/B BALSAALABINOM131 4-40 T-NUTS S BOLTS BLOCK3/8 SOFT BALSA TAP FOR I/O-ZOkS/H 010 FIHEHOLASS COWLSPINNER -I -flE-KAF-Il III iCANOPT- COCKPIT AREA IAIII III I I _ -II __IIIII I I/ZBALSAI OW PL F-Nil I11 ...I II THFSTOCK HATCH TONGUE - I F-ri II 711 UiI i -----ZINOES 10 K Fl/A H-SO RH HALTEPOXYOx 3/4 BALSAPOSHEK PHOP TRAPPED E TOP VIEW EPOOTPSAS SYWAW'\I/B LITE PLY 1/1K PLY--.....WAKE I/H TM-STOCK I 3HBALSA0TRIBTO L~--IF-SROBART DOW F-SL_________IT-NOT K-D2 IEPOOTIOs HEMOVE FOR FOEL illiiiTANK ACCESS IIIII pF-6Ul II 04A IRE ORR IN PkASYIC ISO 121 SODA BALSA F-R 1540KF-fl T I-P/KS/IS PLYWOND Fl-Ia 3 I/2T ____ 2-I/H L 1/2 3-I/O 3/sO WOSIC WISE -1/1K PLYWOOR - R 156 50 040K lOSSO 1OYEW MWSOWER IAFTER UFE OP WITH 15K SQ BRASSASH TO SHAPE TUBENOTE RUBBERS AWE 0*EL A2EAEJaLI I42AALKZ2RN 125 50 BRASS _____I/U BALSA SHEETTUBE SHER MW HODDEK ISOFTISOLDEK - 'I/IHPLTWOOO I/H LITE PLY SPOCEKS 3/32 BALSA-NBLENO 3/32 I-D4 AlASHEET7AT WATER 2 TI -.LL/TUPTYHO FOR B52 NYLONFS SCREW 121 STABILIZEHi~ -1/1K PLYWOHO LS LITE PLY NOTE AFT EWAIRE COWL IS USHT WEIGUT- LAYER H DO LOATH PLUS LAYER 2 02 OLSON AFT EWAINE 500k ALL BATEHIAL MEDIUM BALSA ARLESS SPECIFIED OTHER Sb WC HID CANOPY RE-WORKEOI niN - FRAY F-7"HATCH BALSAII F-00F-B STOCK vzziU ALL LYBx 3/4I --. SOFT BALSA FILL F-HTIWVOKD/B.-24T1 ALSAI________ __________________-N I/ZBALSA F-Il 01 "CLuRK FOG THI-STOCK .----Io --STABILIZ VL SOALSOWALSA I/BBRLSA R-BLOCK SHEET I/O BALSA THI-STOCKF-6ALS PLC T AID- H HEOKIHEB~----4-40 BOLT-REROOC HEAD OR 1/H LITE PLY PLY N ESOAKS/AF-90TH 00 BALSA BALSABASIC WIRE IEf7iLSOFT BALSA PLYCLUMP N SLOE FILL --1SPECIFICAT IONS - SECT A SAWS WING SPUN HO COT OOT AFTER/550 AREA SQ 14 3/52 BALSA SHEETZNZATTASH AFT-PLYWOWOWEISHY IFUELEDI 9 LSC HDZ ASSES BLY IW PLYMAKE 2WISH LSAOINU OZ AIRFOIL.IH 7 SERI-SYM 34K BALSA SHEET L/$3JWITB WASHOUT POWER TWO 00 ENOIRED F-IaF- IF-S-HATCH2-CYCLE TeNUE F-H BLITE PLY 121 MODEL AVIATION PUSH-PULL 240 TWIN ENGINE R/C MODEL DESIGNED BY AL MASTERS TRACING BY JOE DEMARCO sanded correct outline cut apart finished components should include drawn centerlines aid lineup during sembly Cut lightening holes F12 af ter separating F13 Glue six con struction aids F12 Make preformed 3A2 balsa skin aft fuselage section will need some household ammonia cardboard tube approximately three-inch diameter core tube Christmas wrapping paper works fine Left The wing panel begins take shape has turned over show construction tabs Above bare bones horizontal tall show lightweight structure Because engine vi bration1 must rugged conventional model April 1989 29 upper rudder fitted square brass tube assembles lower rud der tall wheel hatch offers easy ac cess fuel tank supplying aft engine Wheel pants cut 1-in balsa block reinforced 1/-in birch ply carve nice streamline shape ex tra drag helps slow model down during landing model twin has frontal drag single-engine model finished nose cowl foam plug roughed-out aft cowl plug aft cowl can omitted front cowl adds 4 oz much needed nose weight lightweight aft engine mount used help get right CG Select two 7-in lengths /32 sheet 6-in-wide stock Trim balsa 5in width soak ammonia STABILIZERS/B SO BALSA LEADING LEFT STABILIZER STARRI PA CITE PLY BEFORE I/B lI/A BALSA~OsA SEE SHEET RIBS ORE OBOESTRISTOCK VBx I/A BALSA RIB SUPPORT I2OBALS S/IHZ I/OFiLL BALSAJ 7BABORT3OBI/OSA HOBOij BALSA SPAR CSCRAP BALSA 01 I/Bx I/O BIB SUPTS015 ALA /1/ AOR PETLOWER SURFASE INSET / 3/0 SOFT BALSA SHEET S/TOZZRALSASHLfl IBS-SAEETI NOT SBOSAN OR LEFT / ROSA SARIS1/5 50 OARS 3/32 SCRAPTA CONTOURBALSA BALSA RIBSvO BALSA SHEET BATE TRIAL FIT STAR TO VFOSELAAE BEFORE ATTACRIRS VA SO BALSA I FILLELEV-STAB SECTI LVI I/A BALSA I COVERING STAB IIAVA SCREAj~ PUT 7ORILL FOR ipL5/32 B BI I/A BALSA LEASISS OIS ALUMEASEy 0/01122n-p-iiBALSA /_____UWING ____ I_ ~1I _____ PLAN TOP VIEW _______I BALSASBIItZ BALSA 5/52 BALSAI I/B xl BALSA LE3/Az OBEET RIRIO V4x S/B I/B I/O BALSABALSA SOB LEABISA EPSEI/H BALSA2 RISER 5PM SHEETWITHOUT CAP S/SO RALSAVA 120BALSA WISE SHEETINGSPARS 5/52 BALSA least five minutes Blot wood pa per towel wrap around tube using masking tape hold place Set balsa skin aside allow air dry thor oughly Save ammonia another proj ect Begin assembling fuselage over top view plan Support sides up right glue firewall place using F5 spacer Use white glue since will allow time lining everything up Place weight such ordinary brick top front edges fuselage sides clamp FW place pull aft fuselage section together time lower fuselage line forward F5 straight weight will keep setup square work surface until glue sets Attach FR using white glue 10-minute epoxy aid clamp Hold sides together attach F6 cyanoac rylate CyA Add two 14 x %-in crosspieces fit Fl 1 Check position WINO L DIHEDRAL DETAIL NOT SCALE F5 tack CyA Make relief notches Fl clear blind nuts back side FW Force Fl position will aid correcting misalignment front firewall F5 attach CyA Install /6 x A-in hardwood servo rails make servo tray A-in ply fit After gluing F3 place set fuselage asideyoull com pleting laterand proceed wing Wing Trace cut set ribs using pattern make second set Fin ish sand ribs pairs draw chord lines shown both sides rib Cut dihedral braces draw two centerlines indicated both sides leading edge brace Cover wing plan wax paper plastic film before pro ceeding Cut four straight x A-in balsa spars length point weigh four pieces distribute spars avoid using LS 1122 SUB LEAGIRS EDGE 30 Model Aviation Due heavy side loads engine weight necessary use birch ply hardwood lower tail post system Note soldered upper lower torque rods Full-Size Plans Available Page 188 I/B BALSA REMOVE FOR SERVOSMEET IFI 2 Q1 — U AILERON SERVO-L SOFO RULVA- 01 LI lb 0I RALSA OREET IOFT ALSA SO EDGE S/IA DIA DOWELS WINO SOLO SOWN I] NOTE BIBS 2 TRRU 12 ABE 5/32 BALSA SHEET 3 [I 45678910II12 111 II r I OR BALSA SHEET WISH YIP FRAMES I/R PLVWDODV UPPERI/R PLYWOOD_______ I/R LITE PLO1QWiR t __ LEADING EDGE VA PLYWOOD S/DO RALSA SHEET TVP H BOVVOMjSERVO DOONYDIHEDRABRACESWING TIP DETAIL HAL NA S/HI/O /0 BALSA1II______ 71 FILLHOII WINO BOLT PLY4 ACCESS I/O BALSA SUBEE -PUSHPULL 240 3/BR I/O OIL STOCHL --TWIN ENGINE R/C MODEL RI LIGHTENINS ROLES ISV BTA FUSELAGEI/IS BALSA SHEETDESIGNED BY AL MASTERS SIDEBATH SIDESWORK SURFACE I254NTRACING BY OE DEMARCO IIIII ALL RIGHTS RESERVED FILL ISO MUSIC IKE EPOOVI / I/B BRASS TUBE EPOXY TO OK aileron servo carried well forward wing Z-bends A-ln music wire pushrods used connect servo Arm II I-V117j4I TRI-STOCEILIli-TiI #~p Iftv 11-----S I/B LIVEF4[~SRWVAII DLV April 1989 31 receiver battery pack three servos nestled lower nose section below 12oz front fuel tank dual take-offs 5-26 servo controls throttles both engines Left Both K&B 40 05 4OFP have used tor tne aft engine witn equal success Lite Ply spacers firewall provide clearance Tatone manifold Right fuel tank nose compartment sealed keep fuel leaking electronics below two heaviest same wing panel postal scale coding used Glue lower ply dihedral brace spar halves position spar over plan securing pins weights Position ribs 1 through 12 spar making sure construction tabs resting work surface x %-in trailing edge x /2-in leading edge pinned place ribs aid lineup space between ribs 1 2 pro vides leading edge brace will slipped later After making sure ribs perpen dicular work surface CyA ribs spar leading edge trailing edge Fit upper spar glue place Block sand upper surface trailing edge slightly follow rib contours Select four sheets %2 balsa 2-in stock upper lower trailing edge skins Check weights using two heaviest opposite panels Hold metal yardstick edgewise across ribs board sheet edge certain sheet line will straight attached ribs high rib can carefully sanded down dont worry about low rib point Turn wing over Using piece wood such ruler press wing down ward contact %2 sheet bond ribs CyA Work about three ribs time starting rib 1 skipping low ribs Maintaining straight sheet line out waves important gluing rib chip A-in triangle stock can used support skin low rib cap strips added later will hide multi tude construction errors Build wing tip attach rib 12 Center tip rib chord line leading edge 4 x %-in trailing edge balsa filler trailing edge tip will allow block sanding fit con tours %2 sheet aileron Attach tip webs will final sanded after rib caps place Add four hinge supports vertical-grain %2 spar webs between ribs 3 12 Fit rib iF place panel inch off work surface rib 12 set iF perpendicular work surface glue trailing edge spar notch tack gluing leading edge Note iF shown actual length plan reaches leading edge strip Allow space spar notches fit dihedral brace mating spars later Set panel aside construct oppo site panel similar manner completed second panel work surface fit two panels together El evate first panel 2 per draw ing push lower spars together until butt Slightly bevel spar end ob tain good fit upper dihedral brace slipped alongside upper spars clamped using least two clamps side wing centerline Make sure %-in dihedral brace fits flush slightly below spars sanding down later will difficult Add leading edge ply brace clamping same manner Rib iF will have razor sawed shorter Make sure horizontal centerline leading edge di hedral brace located correctly ribs 1 2 both panels bottom edge of servo mount sec Continued page 34 32 Model Aviation finished model resting authors balancing rack Location correct cxi shoula always determined model before making first trip out flying field idea RC Push-Pull 240 came WW Ii Dornier-335 Reported worlds fastest propeller-driven aircraft its time war ended before could made operational youve ever fuel tank split leak fuel fuselage know important install tank can trust Du-Bro Products manufactures complete line rugged polypropylene tanks 10 convenient sizes 2oz 24 oz guaranteed life against splitting leaking money back tank comes complete soft brass tubing hardware Protruding front lip prevents fuel lines being crimped hard landings Single twin vent design gas conversion stopper available use tank gasoline Cat No 400 Visit local Hobby Shop fuel hook up accessories can Cap Fittings In-Line Fuel Filter 0 Fuel Tubing Kwik Fill Fuel Value Gas Gb Fuel Tank Filter KwkF Fue Pump tion should parallel work sur face wing level upper spar leading edge clamped rear section wing panels butted trailing edge make final check spars run straight tip tip Hit ar eas CyA Carefully turn wing over clamp lower dihedral brace two clamps CyA Add four 3A-in triangle braces ribs 1 2 Complete center section shear webbing cut off con struction tabs Add balsa filler blocks trailing edge bays between ribs 1 iF Carve notch bottom iF accept W2 Install latter gluing flush bottom rib 1 Remove section iF accommodate aileron servo location Wl can shifted neces sary allow space aileron servo stall Wi add A-in triangles support W2 upper lower leading edge sheets attached /16 overhang leadmg edges Wetting outside surface sheets will make forming easier sheet edges will block sanded until leading edge provide flat gluing surface x 1-in leading edge cap Fasten -in -thick scrap spacer along leading edge masking tape Place wing fuselage check saddle area fit Remove wing epoxy hardwood hold-down blocks place temporary x -in cross brace glued near blocks fuselage side support epoxy has cured align wing fuselage hold place masking tape Drill through W2 hardwood blocks Y6 bit held perpen dicular W2 Remove wing re drill W2 A-in bit Tap blocks A-20 wing bolts Bolt wing place drill two s through F5 leading edge Wi Trial fit two /, dowels shown plan Use soft balsa foam filler around the wing bolt holes sanding down center section top sheeting Remove dowls complete wing sheeting rib caps leading edge cap Drill through leading edge cap /16 bit two dowels epoxied after wing has covered Ailerons Cut two aileron cores 3/ x 1-in aileron stock After making lightening holes cover ailerons /l6 sheet balsa Drill four holes hinge pins 1-in bit drill %2 hole torque rod Transfer hinge locations wing drill Trial fit ailerons hinge pins /2 torque rod assemblies alignment correct epoxy brass tubes onto wing trailing edge Remove ailerons final sanding covering Fuselage-wing assembly rmal fuse lage construction Razor saw two slots 34 Model Aviation top F5 sand accept wing dowels make /6 drilled holes oversized dowels inserted bolt wing place Lay small piece wood across top dowels trace its lower edge line location F5 Move down /16 below line just made fit piece A-in ply between dowel holes epoxy F5 Epoxy 3A-in triangle brace under ply Drill /16 hole center through ply tap A-20 bolt Treat hole CyA A-in ply wing hold-down has A-in drilled hole see drawing detail Cut two fuselage trim pieces / x % x 15 long medium-hard balsa Glue top FS extend yond FR about 4 dont glue beyond F7 Make /16 notch trim piece allow pulled together slightly behind FR secured rub berband tape Slip piece wax paper between FR FlO clamp FlO FR Glue FlO trim pieces being careful bond latter FS Cut piece x M-in balsa width F7A Add /16 ply top drill 140 hole #27 bit shown Glue x s-in piece top trim piec es F7 Glue F7A top crosspiece after fitting over /16 ply stall 1 A-in-long 6-32 socket-head bolt washer through 140 hole Use small piece tape keep bolt fall ing out Trim section preformed %2 skin fit between F7 FR overlapping both slight ly Sand bottom edges theyre alignment top trim pieces mate F7A FlO CyA skin trim pieces Aft hatch Razor saw remove aft ex tensions trim pieces cut through F7 Remove hatch section com plete application CyA F7A FlO piece plastic soda straw epoxied place will keep 6-32 bolt trapped Sand %2 skin flush F7A Install F8 F9 through slots cut formed skin Small pieces triangle stock add final rigidity unit Complete hatch front hold-down placing piece /16 ply 6-32 blind nut under two x 3A-in fuselage crosspieces Line up hatch snug up 632 bolt Use Du-Bro ball wrench inserted through small hole skin CyA ply place remove hatch epoxy ply cross members two /16 ply aft hold-down tongues installed follows Shave off excess material inside hatch trim piec es 6-32 bolt masking tape rear holding hatch place work through opening fuselage bottom Position ply tongues tack CyA F9 %2 sheet bond FS Remove hatch ep oxy tongues Again bolt hatch secure Continued page 136 EffectiveJanuary 1989 Fox motors except Combat supplied muffien some time have using soft sell approach columns customers direct some excerpts letters have received Eric larson Pine Grove CA Fox Mfq Yesterday bought Fox 4OBB Delux thefirst Fox engine have owned some apprehension bought anything other OS engine have burned before buying off brand engines Today am convened Fox 40 40SF similar both start idle magnfkenrly cant tell dfference power thats similarities end Fox 40 vibrates less easier adjust lighter comes great spinner costs hoff much American made hove now made sure everyone myflying club knovs what great buy Fox engines THANK YOU FOR QUALITY PRODUCT Eric Branham Paris IL r purchasing 40 Delux year lam impressed performs exceptional lot better OS Are planning replace Eagle III update 60 size will assured will first line purchase Jon Armitage Indiana PA ed send letter praise about motors motors used flew C/L FE started RC about year ago decided try Super Tiger 25 0S4 Stroke 40 good came bock Fox power quality handling allot decent price engines popular field Will Sgarlat Cape Cod MA note tbonksfor youve donefor wonde4izl hobby yourflne engines Dukes Mixture column temfic service offer us accidentally smash up Fox engines beyond what theyd care tackle repair Westley Keller Gouster OH have meaning drop linefor some time 40 motor trouble replaced put icing cake will never run anything planes unless says Fox side performance service says subject Decals present time am running 8 Fox engines am requesting Decals accordingly Alse lam lookingforsvard coming Eagle 4 Keep going best engines world Barry Doughty Absecon NJ placed old OS Max 60 Clipped Wing Cub Top Elite new Fox SOBA WOW what engine no vibration started right out box no adjustments Idled good accelerarionfrom idle full bock reenfic Weight bigfactor purchasing SOBBRC lighter OS SuperTigre Come etc Also must add replacement parts economical foreign imports Coming landing motor idled down beautifully settled infor great landing Again engine something else loads power very easy onfuelfor SO size engine John Holder Ob Seeverson AL ne obviously drfective else would have pulled wings off Aerostor 40 Seriously very pleased myfirse Fox engine Vaughn Kempf Modern Hobbies Miles City MI wanted take afew minutes send afew wards praise way talked three customers buying Fox 4OBB Delux motors quite impressed motors have couple observations pass along First havefound performancefigures seem little conservative modest measuring 14000 plus Master Airscrew 10 x 6 props using Royol Pro Tachfor readings Idle lower other 40 Ive ever ron realiable during spins soaps inverted idling Kenneth Wilson Schenectady NY know lam loyal satisfied Fox engine user over years Ive owned U/C 36 Fox R/C engines such Fox 2S early Fox 40 Eagle III currently own 2 Eagle Ills must compliment quality value youve designed built Fox engines Corey Wills Perryville MO compliment having thefinest engines made Several myfriends have flying Fosfor past three orfour years wouldnt give up other engine somewhat higher prices lately still cant beat affordability reliability performance Doc Matthess Wichita KS drop note express pleasure over engine Fox 45 Excellent midrange easy start set super neat spinner set up andfinally sofe incredible power larry Maltman Winnipeg Canada k kindlyfor promptly courteouslyfilling last order appreriate excellent service seems todays hurried ways few businesses take time what just seemed naturalfor Fox Mfg Ca have active builder/flyer since 1962 Myflest Fox engine reliable durable lam also happy state additional 17 Fox engines have purchased since 1962 running reliably consistently lester Goldsmith Action Hobbies Memphis IN riting tell Fox 60 Heli Engine has cranked run flawlessly rightfrom start Enclosed pictures Schluter Scout 60 1 did test run engine before installing believe really necessary because just cranked Fox 45 Heli today new unrun except byyourfacroryj new Schluter Junior though test run too cronked ran immediately idled perfectly very smooth believe word getting around Fox best buys now because compression al ways good making starting good power output always above average tops confirmed test articles magazines Life always goad because appear cut corners importantfeatures such bushed conn rods grades material Ruts always hand tap factory service unmatched anysvhere Eugene Mathis Daphne AL Fox 4OBB out Clubfleld last Saturday kicked tires lit thefires took off leaned bit andflight number twa went whole tank really started come Flight 3 very spectacular pulling vertical stall turn Ifinally throttle off hung prop just kept going veritable hoss because Kaos 40 weighs ran Walter Pawlukanis Oakhurst NJ normally write manufacturers anyone else asfar goes matter offact cant remember wrote last However am really impressed Fox 4OBB Delux WOW what engine have mounted 40 size Ugly Stik type airplane about 2-1/2 gals offuel through irsofar Eyes popping started right up required some hi 5 peed adjustment Since until now has gotten better better Vertical performance just doesnt quit ttle response certain sure Im willing wager bet money its certainty AlMancini las Angeles CA te thank youfor incredibly fast turn around phone order Onward Upward Andy Keeley Memphis IN ht Eagle III put 6-1/2 pound airplane next day flyingfield great airplane vertical performance needed Thank great engine also like Dukes Mixture Model Airplane News Happy Flying Manufacturing Company 5305 Towson Avenue Fort Smith AR 72901 Phone 501 646-1856 April 1989 35 Freebees available time new color catalog new price sheets parts sheersfor 1988 1989 model motors wauld appreciate receiving seffaddressed envelape twa stamps however masking tape rear Drill through sides tongues #29 bit 136 tap 8-32 nylon screws Replace fit hatch Sand Y32 skin flush FR Fit forward section formed sheet glue place hatch place shave sand trim pieces shape F6 aft FS Cowls nose cowl adds needed weight attaining correct center-of-gravity aft cowl merely cosmetic lost foam method can used make fi berglass cowls Styrofoam forms made undersized allow cowl wall thick ness Use batches Hobbypoxy 2 four layers 6-oz cloth strips nose cowl aft cowl takes layer same size strips Add final layer 2oz cloth both units After epoxy has set gouge out foam use acetone remove resi due ply cowl mounts installed last epoxy strips fiberglass cloth nose cowl should have final weight 4 oz Use hex ball-driver reach hid den socket-head bolts use extended sides FS shaped balsa blocks instead glass nose cowl may need add nose weight correct centerofgravity Empennage Its important build sta bilizer light strong aft engine right trying shake apart Build main frame flat over plan protected wax paper Notch tip pieces R-in-sq hard balsa spar Add 10 rib supports hinge blocks Dont forget A6 ply trailing edge doubler Trial fit frame fuselage Posi tion A-in-sq balsa inboard ribs hug fuselage sides sanding ribs ap propriate contour procedure allows unit covered prior attachment fuselage Add remaining ribs fit four A-in vertical-grain braces will epoxied place after stabilizer has covered attached Assemble elevators /I6 dowel block sand shape 015 alumi num support formed around dowel Build upper lower fins associated rudders upper rudder has groove its lower edge accept Y32 wire torque rod Fit upper fin place over F8 F9 lower fin tail post A-in birch ply predrilled A-in bit hinge point Make lower fin including /16 ply bearing piece %2-in hole lower torque rod trailing edge fin clamped glued after hard wood block formed tail wheel wire has glued place Add soft balsa filler set aside Rudder torque rods make upper torque rod start cutting two pieces % music wire making 2 sec ond 4/2 long Make 900 bend 1 end Solder -in sec tion K&S 125-in-sq brass tubing its end 3A-in leg Allow no solder outside brass part Tinning wire first sweat ing brass wire makes nice neat job Make upper torque rod Solder /2in piece 125-in-sq brass tubing onto end 1-in leg 2%-in piece 156-in-sq brass tubing slipped over 125 tubing ered Lay upper lower torque reds flat board relative positions Assem ble lower tube upper tube telescope mating parts one-fourth inch Tackle upper wire assembly soldering iron remelting upper joints applying very light pressure both 900 arms resting flat sur face arms will now lined up parts assembled specified before remelting lineup risk fusing whole assembly making un usable Telescope two parts checking ease fit dimensions Assembling covering Finish fuse136 Model Aviation ELECTRIC SEMI-SCALE Radio Control Sport/Trainer Wing Span 67 3/4 Length 37 1/2 EIII see Local DeCirn PAUL K GUILLOW INC WAKEFIELD MA 01880 Push-Pull/Masters Continued page 35 lage assembly fitting top batch canopy area sealing front fuel tank area epoxy Fl P2 provide fueltight compartment protect electronics carried below Assemble controls sup porting necessary Add triangle stock close up compartment F13 Cut lower hatch provide retaining Attach Halco strut four 4-20 aluminum bolts plastic nuts wheel pants sawed 4 x 12-in balsa block thick Reinforce A-in birch ply Resist tempta tion carve sand wheel pants nice streamlined shape need cer tain heft order contribute drag land ing time Remember although two engines idle frontal drag area single engine After final sanding vacuuming free dust cover individual parts favor ite material Coat both firewalls epoxy inside out covering stabilizer leave bottom center section open Position stab attach CyA checking align ment carefully Pass lower torque rod through /I6 ply bearing Fit lower fin slot F12 clamp lower tail post A-in Lite Ply fuselage cross brace Square up epoxy fm leading edge inside fuselage Attach A-in ply lower tail post A-in Lite Ply cross brace using CyA Glue four vertical-grain A-in braces stabi lizer fuselage sides Close up stab center section Push lower rudder over torque rod epoxied hinge point Make sure treat center hinge point pe troleum jelly expect hinge action af ter epoxy cures Angle upper torque rod position through its ply bearing join two torque rods Fit aft hatch place bolt Assemble upper rudder its hinge point Line up two rudders epoxy upper torque rod groove bottom rudder Install elevators attach 015in aluminum support aft firewall two No 2 screws Secure tail wheel tiller loop lower rudder small rubberband bound tightly possible tail wheel off set rudder pushrod undersize minimize servo shock engines place pipe up fuel systems using pressure both Use Hig ley Heavy Hub Master Airscrew 10-6 prop up front lighter Zinger 10-6 wood pusher prop rear combina tion will give extra 3 oz up front counts Install electronics feeding anten nae back through upper lightening holes snaking out three holes left side just above stabilizer Flying single servo controls both throt tIes using Du-Bro EZ connector ca ble arrangement servo throttle linkage can independently adjusted Set front engine reliable idle high-trim position Low trim should cut engine Kill front engine set up aft engine same manner Setting up engines manner makes unlikely both can cut off precisely same time However pre sents no problem since engine should fail final approach go-around single engine readily made desired Its unnec essary synchronize engines just have both running well Its important aft fuel tank car ried high possible within tail sec tion use piece l-in-thick foam under tank Since engine pusher configu ration does have rain carburetor air tank location relation needle valve critical order avoid early starvation fuel level lowers small sheet metal scoop attached direct rain air carburetor throat Although worked ef ficiently carrying tank higher much less trouble equally effective Keep simple Note also rear tank clunk stalled forward position Having used clunk pickup both directions pushers Ive found forward installa tion satisfactory requires much less fuel line As aircraft having pusher propel lers special precautions must observed prevent debris going through Continued page 141 April 1989 137 1t I] iyu 111 E1ii RE SHOOTING DOWN HIGH BALSA PRICES WITH SUPER QUALITY Satisfaction Guaranteed Direct Only BALSA SHEETS 36 48 30 BALSA STICKS 3648 16233 332240 18243 316249 14256 132337 20337 163374931 33234458 37 1835471 45 31636282 55 14373 95 61 516395110 38355124 71 123110155 34 3165191 116455 7648 332470 9456 18 48010666 316493122 75 14411013484 38 4165225139 12 4225261 MATCHED SHEETS 42 3324100 164109 3164120 144131 116 14 116 36 116 12 332 14 332 35 332 12 18 18 18 14 18 36 18 12 316316 316 38 316 12 14 14 14 30 412 14 34 141 516516 3838 3812 3634 381 1212 1234 121 58 55 34 34 Os 10 14 10 12 16 08 11 12 18 11 17 22 16 19 21 34 40 21 27 32 42 52 36 46 56 48 67 16 18 24 16 20 30 24 26 30 44 55 28 37 46 55 70 53 62 78 66 90 BALSA HOT LINE Call 806 745 6394 10am 6pm Central Time BALSA TRIANOL ES 36 25 8830 35 45 55 BALSA PLANKS36 86 0 00 1480 1123275 1124360 22225 23325 24435 33495 34668 TAPERED SHEETS36 142 65 143 65 382 83 23120 LONE STAREPOXY 90L sI--S 95 5so598 iSoro598 38 rro598 CUSTOM CUT CONTEST BALSA Sheets Piece ed Close Tolerances AAA Grade Dried ped 100% a serious modeler want performance must try 4-6 lb balsa LIGHT 4-6 LB WOOD 1 32 3 1/203 1163 332 3 183 3 163 143 383 123 343 13 1 164 3 324 184 3164 144 384 124 36 53 53 53 63 77 89 104 122 158 242 335 83 100 115 133 158 236 322 TRAILING EDGE 36 14132 51611439 3811246 12270 INSTANTOLUE 1 o TSck 298 10 750 298 20 T5ck 550 20 150 550 BASSWOOD 316316 31614 31638 31612 31634 1414 1438 1434 3838 3/812 3634 12 1 2 1234 BUNDLE DEALS 28116336695 201164361035 20332 336865 15332 436955 151/8336738 101/8436895 15318336920 10316436835 1014336655 101/4436830 103/8336870 53/84 36655 51/2336540 5124361580 10-3324 48885 518448500 5316 4 48600 514448645 48*NEW* 26Hundreds 30 38 46 cessories 60 ishing 42 materials 80 60 #10 SASE 70 atest 90 catalog 100SPRUCE STICKS 3648 18 181725 18 142026 18 3/822 32 316316 28 38 14 3/84055 14 124585 3/8 3/84969 38 126577 12 I/O6688 12347597 SPRUCE TRIANGLES 38 38 12 1 2 34 34 1846 18412 146 HARD MAPLE 1 4 36 3838 38 12 3834 1 2 IRCH DOWELS 18 316 14 516 38 18 40 45 50 58 68 36 09 11 14 25 32 3PiVBIRCH48 16412620 13212445 11612455 1812485 SPLVBIRCH 48 33212588 1/812 625 36316 12625 4714 12828 8438 12725 8112 12900 LITE PLY 48GROOVED LGMOUNTS lllachea 15538341840 3153834/532140 2501234916/45 495 V. Push-Pull/Masters Continued page 137 prop author owned full-scale Lake Amphibian pusher years found protecting propeller loose nuts bolts fishing rods always major concern twin engine push-pull arrangement especially vulner able front prop can kick up stones starter cables wiping cloths etc promptly present rear prop digestion Flying twin pusher also requires special watchfulness flight Push-Pull 240 near-fiasco Immediately after takeoff carburetor aft engine came loose moved pusher prop promptly seif-destructed en gine full bore extremely unbalanced tore itself firewallbefore fuel starvation saved day whole scenario lasted about three four seconds pilot Ray Doan brought ship back single engine thorough preflight check would have spared pusher prop main thing remember get Push-Pull smoothly aloft advance throttles steadily during takeoff Ground control will positive no torque cor rection required Clinibout will solid watch slice through ether sound twin 40s something else Radio Technique/Myers Continued page 37 RC34 through RC37 vice versa 2 next condition change comes out mathematics frequencies coo Image interfer ence will return few SC455s Some folks will remember 7296 Y/W used image 7208 Bn/W Well SC455s RCll-14 RC57-60 can af fected Tx within band have local oscillator wrong side assume manufacturers simply wont sell SC455s channels Besides image coincides exactly Common Car rier Tx frequencies RC Tx helps Rx low LO have possibility imaging TV4 RC44 problem know love So see nothing simple cure above simple Use dual conversion Rx entry-level RC system almost always uses SC455 manufacturers will have narrow-band pay attention proper LO signments keep off RCll 12 13 14 34 35 36 37 57 58 59 60 Jim didnt mention channel doubt above manufacturers just arent selling Indirect Interference condition comes out numbers called Second Order Intermodulation Product Interfer ence 21M generated ANY PAIR Tx operating 23 RC channel numbers apart difference two frequencies modu lated 460 kHz signal often goes right through 5C455 detected interference Think 21M generated JUST ONE PAIR Tx might hit OWBAM SC45Ss SO channels simultaneously including own Rx depending signal strength Rx tenna RECEIVER CHARACTERIS TICS Nobody uses odd-numbered RC chan nels RCll 13 15 today dont see 21M Can predict what will happen give 25 odd-numbered channels another service Now remember discussing RE CEIVER problems assumption everyone already using Gold-stickered narrowband transmitters Practically Tx built since 1987 good enough warrant sticker easiest way avoid problems listed above use dual-conversion receiver dont have block out ANY channels Jim manufacturer offers best dual-conversion receivers market relatively cheap recommend letter appropriate person named end last months column narrow-band 5C455 can work cause interferences discussed above z off 455 kHz intermediate frequency IF dead like 31M Narrow-band SC455s exist example Bob Aberle recently tested Polks Pow ermax Merlin system receiver 5C455 RC46 its LO low side An IF bandwidth 6 dB 2 kllz claimed nothing quoted 85 kHz Merlin performance meets AMA guide lines except ins LO wrong side does use dual conversion DC outper formed 1991 DC system have tested ex cept its PCM computer slow April 1989 141 LONE STAR MODELS1412 1623 S7th St Lubbock TX 79412 cant 46 Handling charge pay UPS Add $250 COD $300 extra PP APO FPO StateS accept Vs4 Master Card personal checks COO 6% 368/n TenaS US crrency Mnmom Wood Order 51000
Edition: Model Aviation - 1989/04
Page Numbers: 24, 25, 26, 27, 28, 29, 30, 31, 32, 34, 35, 136, 137, 141
NO OCR TEXT NO OCR TEXT Left aft hatch hides 6-oz fuel tank tar rear engine natchlfin unit rejainca wuin trappea o-a aovw-neea oumi ana iwo O-J nylon screws Right Removing front hatch reveals plywood keeper holding two wing dowels place Under Sig canopy Williams Bros pilot ready go wing bolt covers made aluminum cigar wrappers have painted match Left simple onset tail wheel tiller lessens servo shock during ground operations Right Fiberglass cowls nice addition model difficult make 4-oz weight nose cowl helps balance aft cowl may omitted desired Fuselage Use piece A-in Lite Ply 12 wide 48 long Determine whether want separate fiberglass nose cowl built-up front engine compartment opt built-up style add 4 part labeled PS front FW plan Placing Lite Ply under fuselage side view locate end points straight lines pin pressed ply Con nect points using ball-point pen Hav ing basic lines straight makes easy work drawing sides curved sec tion wing saddle can traced few pieces carbon paper slipped between plan plywood Cut out PS sand down lines shown plan Trace second side first cutting sanding outline Clamp two sides togetheror socket-head bolts attachIng cowls can reached hex ball-driver hold together small pieces masking tapewhile block sand identical size errors tracing inevi table Make sure edges square 6 x 12-in piece /16 birch ply used nose doublers F4 Use FS template Make cutout section gear mount P3 Apply very thin coat 30-minute epoxy doubler P4 position FS making sure allow firewall FW Use weights clamps until ep oxy sets Make right left fuselage side asme Haico B106-8 strut Du-Bro axle K&S 062 aluminum clip hold rugged plywood-reinforced wheel pants place sembling its respective birch nose doubler Make two aft doublers Fl 1 attach thin layer epoxy Allow correct spacing aft fire wall FR two small doublers F6 can also attached using white glue suggested sides resanded en sure upper lower edges true identical sides placed inside surface faces up carefully draw locations Fl F2 F5 F6 F7 Make firewall FW laminating A-in birch ply Cut FR X6-in birch ply Draw horizontal vertical thrust lines both sides firewall will using engines different makes pick heaviest tractor front unit engine including muf 26 Model Aviation DESIGNED BY AL MASTERS IG WC 813 CRrJOPY FI0ERGLR ccWL--pwORKW OP&BOJTOM 3A6LA GOLD8ER%RLBR_ \\ /axBf4L N / 2 _____ NGL016 pIY IV 13~gW 3/ 15 pUI y8%Y I3R$A Qj 4EET 1~ 4 C ~RVY 2 Weigh wing spars determine two heaviest Place 01 heavy spars right panel other left fler attached its mount position firewall canting counterclockwise see front view Hold thrust line indicated allow muffler clearance proper carburetor location respect fuel tank Mark drill firewall stall four 6-32 blind nuts three tend use fiberglass cowl back side aft engine side mounted exhaust down standard mount such Dave Brown 4045 can used light weight variety shown plans engine should placed close FR possible still allowing clearance Tatone EM 4Oss manifold Lite Ply spac ers can used between FR mount mount arms longer neces NOTE FRONT ENUINE INSTALLATION-TUT CHORE FOR CORRECT LOCATiON OF EARNURETOR IN RELATION TO FUEL TANR ATTACM MOUNT TO FERWALL WETTI FOUR 14-32 T-MJTS N BOLTS LOWER MATCR CR LITE PLYF13 1-1 II lOOT UTE PLYII MUFPLER LUCATIONfl I504 RALSA TRISTUCO I/S PLY 4.BOTCH FUR MAPLE MOCR IIIII I/U RALSA TRI-OSUCI I/O PLTiiAjTj I ICONSTRUCTION 010 iT - - NOTE SERVO SHOWN FROMLM PLY SERVO TRAY ELEVATOR AILERONS IRUODEU I/O PLY WOOD I/H PLT IHEMUVAMLEI 6 ~ITEj I/lU PLYPUPLY WITH F-IS I/O CITE PLYHI/lU PLY14-02 TNUT 0101EV HEAVY---2~ ATCH -- OUR IOUZI -UIIBUZI AU TWO-CYCLEFAIrSUORO S-b TUSOIOU MALSA--H \iiiEAGNEII-V TUCKI IF BALANCE IFUAMI SERVO04 L PLY WITHOUT I 1CUSYRUL MASTER AIRSCSEYR 0-14RATT LYSUPPORT GOLORERO 2 SONNER\V- 0-SO ECE1YLR 11400 EI51 TROT--I IFLUM001CR VUNISE HEAVY WALL FIREROLASS COWLP13 IA PRAX 4 00 COMPLEVEUTE PLYHATCH HALCO BlUR-UI/H -005/4 ALUM ROLl 002 005 ALUMLASOINO SEAM H OTLUS SLYTIVI LANOINO OEAR CLIPLIURTEN RAND TU FIT/ ER PLYWOOD- I/O PLY lBALSAZi4IA OOR LITE ATTOEB WITH 004-40 NUTO BOLT TO.. 145O SERER/NAT EAO _FUSELAGI VI E 000140 040 REMOVE NOT FROM RALCO UEAR TAP FOR 001400 VOLE -GZYS 010 500 04 sary should cropped off save weight Use three 4-40 blind nuts bolts install mount Remove mounts before continuing fuselage con struction Cut remaining fuselage components materials specified Note Fl A-in birch ply includes switch cut out F12 F13 shown actual length plan can traced piece Left Fuselage parts Lite Ply sides bottom conjunction birch ply balsa keep weight distribution under control No tice two pre-formed balsa skin pieces fuselage side dou blers have already glued place Above Completed basic fuselage straight lines design signify easy layout 28 Model Aviation wing ribs Irst cut out witn construc tion tabs left provide easy method building necessary wing washout Full-Size Plans Page 188 F-I2oR LITE PLYAFT ENGINE MOUNT 1/H Lire PLY SPACER ID OH 4 REOHIREBI 141 HOLES TO WATCH L/2BALSAENGINE CASE THFSTOCHI/TDA WALSH -I 052 KS S--ATTACH TO F-fl WITH LS KS/B BALSAALABINOM131 4-40 T-NUTS S BOLTS BLOCK3/8 SOFT BALSA TAP FOR I/O-ZOkS/H 010 FIHEHOLASS COWLSPINNER -I -flE-KAF-Il III iCANOPT- COCKPIT AREA IAIII III I I _ -II __IIIII I I/ZBALSAI OW PL F-Nil I11 ...I II THFSTOCK HATCH TONGUE - I F-ri II 711 UiI i -----ZINOES 10 K Fl/A H-SO RH HALTEPOXYOx 3/4 BALSAPOSHEK PHOP TRAPPED E TOP VIEW EPOOTPSAS SYWAW'\I/B LITE PLY 1/1K PLY--.....WAKE I/H TM-STOCK I 3HBALSA0TRIBTO L~--IF-SROBART DOW F-SL_________IT-NOT K-D2 IEPOOTIOs HEMOVE FOR FOEL illiiiTANK ACCESS IIIII pF-6Ul II 04A IRE ORR IN PkASYIC ISO 121 SODA BALSA F-R 1540KF-fl T I-P/KS/IS PLYWOND Fl-Ia 3 I/2T ____ 2-I/H L 1/2 3-I/O 3/sO WOSIC WISE -1/1K PLYWOOR - R 156 50 040K lOSSO 1OYEW MWSOWER IAFTER UFE OP WITH 15K SQ BRASSASH TO SHAPE TUBENOTE RUBBERS AWE 0*EL A2EAEJaLI I42AALKZ2RN 125 50 BRASS _____I/U BALSA SHEETTUBE SHER MW HODDEK ISOFTISOLDEK - 'I/IHPLTWOOO I/H LITE PLY SPOCEKS 3/32 BALSA-NBLENO 3/32 I-D4 AlASHEET7AT WATER 2 TI -.LL/TUPTYHO FOR B52 NYLONFS SCREW 121 STABILIZEHi~ -1/1K PLYWOHO LS LITE PLY NOTE AFT EWAIRE COWL IS USHT WEIGUT- LAYER H DO LOATH PLUS LAYER 2 02 OLSON AFT EWAINE 500k ALL BATEHIAL MEDIUM BALSA ARLESS SPECIFIED OTHER Sb WC HID CANOPY RE-WORKEOI niN - FRAY F-7"HATCH BALSAII F-00F-B STOCK vzziU ALL LYBx 3/4I --. SOFT BALSA FILL F-HTIWVOKD/B.-24T1 ALSAI________ __________________-N I/ZBALSA F-Il 01 "CLuRK FOG THI-STOCK .----Io --STABILIZ VL SOALSOWALSA I/BBRLSA R-BLOCK SHEET I/O BALSA THI-STOCKF-6ALS PLC T AID- H HEOKIHEB~----4-40 BOLT-REROOC HEAD OR 1/H LITE PLY PLY N ESOAKS/AF-90TH 00 BALSA BALSABASIC WIRE IEf7iLSOFT BALSA PLYCLUMP N SLOE FILL --1SPECIFICAT IONS - SECT A SAWS WING SPUN HO COT OOT AFTER/550 AREA SQ 14 3/52 BALSA SHEETZNZATTASH AFT-PLYWOWOWEISHY IFUELEDI 9 LSC HDZ ASSES BLY IW PLYMAKE 2WISH LSAOINU OZ AIRFOIL.IH 7 SERI-SYM 34K BALSA SHEET L/$3JWITB WASHOUT POWER TWO 00 ENOIRED F-IaF- IF-S-HATCH2-CYCLE TeNUE F-H BLITE PLY 121 MODEL AVIATION PUSH-PULL 240 TWIN ENGINE R/C MODEL DESIGNED BY AL MASTERS TRACING BY JOE DEMARCO sanded correct outline cut apart finished components should include drawn centerlines aid lineup during sembly Cut lightening holes F12 af ter separating F13 Glue six con struction aids F12 Make preformed 3A2 balsa skin aft fuselage section will need some household ammonia cardboard tube approximately three-inch diameter core tube Christmas wrapping paper works fine Left The wing panel begins take shape has turned over show construction tabs Above bare bones horizontal tall show lightweight structure Because engine vi bration1 must rugged conventional model April 1989 29 upper rudder fitted square brass tube assembles lower rud der tall wheel hatch offers easy ac cess fuel tank supplying aft engine Wheel pants cut 1-in balsa block reinforced 1/-in birch ply carve nice streamline shape ex tra drag helps slow model down during landing model twin has frontal drag single-engine model finished nose cowl foam plug roughed-out aft cowl plug aft cowl can omitted front cowl adds 4 oz much needed nose weight lightweight aft engine mount used help get right CG Select two 7-in lengths /32 sheet 6-in-wide stock Trim balsa 5in width soak ammonia STABILIZERS/B SO BALSA LEADING LEFT STABILIZER STARRI PA CITE PLY BEFORE I/B lI/A BALSA~OsA SEE SHEET RIBS ORE OBOESTRISTOCK VBx I/A BALSA RIB SUPPORT I2OBALS S/IHZ I/OFiLL BALSAJ 7BABORT3OBI/OSA HOBOij BALSA SPAR CSCRAP BALSA 01 I/Bx I/O BIB SUPTS015 ALA /1/ AOR PETLOWER SURFASE INSET / 3/0 SOFT BALSA SHEET S/TOZZRALSASHLfl IBS-SAEETI NOT SBOSAN OR LEFT / ROSA SARIS1/5 50 OARS 3/32 SCRAPTA CONTOURBALSA BALSA RIBSvO BALSA SHEET BATE TRIAL FIT STAR TO VFOSELAAE BEFORE ATTACRIRS VA SO BALSA I FILLELEV-STAB SECTI LVI I/A BALSA I COVERING STAB IIAVA SCREAj~ PUT 7ORILL FOR ipL5/32 B BI I/A BALSA LEASISS OIS ALUMEASEy 0/01122n-p-iiBALSA /_____UWING ____ I_ ~1I _____ PLAN TOP VIEW _______I BALSASBIItZ BALSA 5/52 BALSAI I/B xl BALSA LE3/Az OBEET RIRIO V4x S/B I/B I/O BALSABALSA SOB LEABISA EPSEI/H BALSA2 RISER 5PM SHEETWITHOUT CAP S/SO RALSAVA 120BALSA WISE SHEETINGSPARS 5/52 BALSA least five minutes Blot wood pa per towel wrap around tube using masking tape hold place Set balsa skin aside allow air dry thor oughly Save ammonia another proj ect Begin assembling fuselage over top view plan Support sides up right glue firewall place using F5 spacer Use white glue since will allow time lining everything up Place weight such ordinary brick top front edges fuselage sides clamp FW place pull aft fuselage section together time lower fuselage line forward F5 straight weight will keep setup square work surface until glue sets Attach FR using white glue 10-minute epoxy aid clamp Hold sides together attach F6 cyanoac rylate CyA Add two 14 x %-in crosspieces fit Fl 1 Check position WINO L DIHEDRAL DETAIL NOT SCALE F5 tack CyA Make relief notches Fl clear blind nuts back side FW Force Fl position will aid correcting misalignment front firewall F5 attach CyA Install /6 x A-in hardwood servo rails make servo tray A-in ply fit After gluing F3 place set fuselage asideyoull com pleting laterand proceed wing Wing Trace cut set ribs using pattern make second set Fin ish sand ribs pairs draw chord lines shown both sides rib Cut dihedral braces draw two centerlines indicated both sides leading edge brace Cover wing plan wax paper plastic film before pro ceeding Cut four straight x A-in balsa spars length point weigh four pieces distribute spars avoid using LS 1122 SUB LEAGIRS EDGE 30 Model Aviation Due heavy side loads engine weight necessary use birch ply hardwood lower tail post system Note soldered upper lower torque rods Full-Size Plans Available Page 188 I/B BALSA REMOVE FOR SERVOSMEET IFI 2 Q1 — U AILERON SERVO-L SOFO RULVA- 01 LI lb 0I RALSA OREET IOFT ALSA SO EDGE S/IA DIA DOWELS WINO SOLO SOWN I] NOTE BIBS 2 TRRU 12 ABE 5/32 BALSA SHEET 3 [I 45678910II12 111 II r I OR BALSA SHEET WISH YIP FRAMES I/R PLVWDODV UPPERI/R PLYWOOD_______ I/R LITE PLO1QWiR t __ LEADING EDGE VA PLYWOOD S/DO RALSA SHEET TVP H BOVVOMjSERVO DOONYDIHEDRABRACESWING TIP DETAIL HAL NA S/HI/O /0 BALSA1II______ 71 FILLHOII WINO BOLT PLY4 ACCESS I/O BALSA SUBEE -PUSHPULL 240 3/BR I/O OIL STOCHL --TWIN ENGINE R/C MODEL RI LIGHTENINS ROLES ISV BTA FUSELAGEI/IS BALSA SHEETDESIGNED BY AL MASTERS SIDEBATH SIDESWORK SURFACE I254NTRACING BY OE DEMARCO IIIII ALL RIGHTS RESERVED FILL ISO MUSIC IKE EPOOVI / I/B BRASS TUBE EPOXY TO OK aileron servo carried well forward wing Z-bends A-ln music wire pushrods used connect servo Arm II I-V117j4I TRI-STOCEILIli-TiI #~p Iftv 11-----S I/B LIVEF4[~SRWVAII DLV April 1989 31 receiver battery pack three servos nestled lower nose section below 12oz front fuel tank dual take-offs 5-26 servo controls throttles both engines Left Both K&B 40 05 4OFP have used tor tne aft engine witn equal success Lite Ply spacers firewall provide clearance Tatone manifold Right fuel tank nose compartment sealed keep fuel leaking electronics below two heaviest same wing panel postal scale coding used Glue lower ply dihedral brace spar halves position spar over plan securing pins weights Position ribs 1 through 12 spar making sure construction tabs resting work surface x %-in trailing edge x /2-in leading edge pinned place ribs aid lineup space between ribs 1 2 pro vides leading edge brace will slipped later After making sure ribs perpen dicular work surface CyA ribs spar leading edge trailing edge Fit upper spar glue place Block sand upper surface trailing edge slightly follow rib contours Select four sheets %2 balsa 2-in stock upper lower trailing edge skins Check weights using two heaviest opposite panels Hold metal yardstick edgewise across ribs board sheet edge certain sheet line will straight attached ribs high rib can carefully sanded down dont worry about low rib point Turn wing over Using piece wood such ruler press wing down ward contact %2 sheet bond ribs CyA Work about three ribs time starting rib 1 skipping low ribs Maintaining straight sheet line out waves important gluing rib chip A-in triangle stock can used support skin low rib cap strips added later will hide multi tude construction errors Build wing tip attach rib 12 Center tip rib chord line leading edge 4 x %-in trailing edge balsa filler trailing edge tip will allow block sanding fit con tours %2 sheet aileron Attach tip webs will final sanded after rib caps place Add four hinge supports vertical-grain %2 spar webs between ribs 3 12 Fit rib iF place panel inch off work surface rib 12 set iF perpendicular work surface glue trailing edge spar notch tack gluing leading edge Note iF shown actual length plan reaches leading edge strip Allow space spar notches fit dihedral brace mating spars later Set panel aside construct oppo site panel similar manner completed second panel work surface fit two panels together El evate first panel 2 per draw ing push lower spars together until butt Slightly bevel spar end ob tain good fit upper dihedral brace slipped alongside upper spars clamped using least two clamps side wing centerline Make sure %-in dihedral brace fits flush slightly below spars sanding down later will difficult Add leading edge ply brace clamping same manner Rib iF will have razor sawed shorter Make sure horizontal centerline leading edge di hedral brace located correctly ribs 1 2 both panels bottom edge of servo mount sec Continued page 34 32 Model Aviation finished model resting authors balancing rack Location correct cxi shoula always determined model before making first trip out flying field idea RC Push-Pull 240 came WW Ii Dornier-335 Reported worlds fastest propeller-driven aircraft its time war ended before could made operational youve ever fuel tank split leak fuel fuselage know important install tank can trust Du-Bro Products manufactures complete line rugged polypropylene tanks 10 convenient sizes 2oz 24 oz guaranteed life against splitting leaking money back tank comes complete soft brass tubing hardware Protruding front lip prevents fuel lines being crimped hard landings Single twin vent design gas conversion stopper available use tank gasoline Cat No 400 Visit local Hobby Shop fuel hook up accessories can Cap Fittings In-Line Fuel Filter 0 Fuel Tubing Kwik Fill Fuel Value Gas Gb Fuel Tank Filter KwkF Fue Pump tion should parallel work sur face wing level upper spar leading edge clamped rear section wing panels butted trailing edge make final check spars run straight tip tip Hit ar eas CyA Carefully turn wing over clamp lower dihedral brace two clamps CyA Add four 3A-in triangle braces ribs 1 2 Complete center section shear webbing cut off con struction tabs Add balsa filler blocks trailing edge bays between ribs 1 iF Carve notch bottom iF accept W2 Install latter gluing flush bottom rib 1 Remove section iF accommodate aileron servo location Wl can shifted neces sary allow space aileron servo stall Wi add A-in triangles support W2 upper lower leading edge sheets attached /16 overhang leadmg edges Wetting outside surface sheets will make forming easier sheet edges will block sanded until leading edge provide flat gluing surface x 1-in leading edge cap Fasten -in -thick scrap spacer along leading edge masking tape Place wing fuselage check saddle area fit Remove wing epoxy hardwood hold-down blocks place temporary x -in cross brace glued near blocks fuselage side support epoxy has cured align wing fuselage hold place masking tape Drill through W2 hardwood blocks Y6 bit held perpen dicular W2 Remove wing re drill W2 A-in bit Tap blocks A-20 wing bolts Bolt wing place drill two s through F5 leading edge Wi Trial fit two /, dowels shown plan Use soft balsa foam filler around the wing bolt holes sanding down center section top sheeting Remove dowls complete wing sheeting rib caps leading edge cap Drill through leading edge cap /16 bit two dowels epoxied after wing has covered Ailerons Cut two aileron cores 3/ x 1-in aileron stock After making lightening holes cover ailerons /l6 sheet balsa Drill four holes hinge pins 1-in bit drill %2 hole torque rod Transfer hinge locations wing drill Trial fit ailerons hinge pins /2 torque rod assemblies alignment correct epoxy brass tubes onto wing trailing edge Remove ailerons final sanding covering Fuselage-wing assembly rmal fuse lage construction Razor saw two slots 34 Model Aviation top F5 sand accept wing dowels make /6 drilled holes oversized dowels inserted bolt wing place Lay small piece wood across top dowels trace its lower edge line location F5 Move down /16 below line just made fit piece A-in ply between dowel holes epoxy F5 Epoxy 3A-in triangle brace under ply Drill /16 hole center through ply tap A-20 bolt Treat hole CyA A-in ply wing hold-down has A-in drilled hole see drawing detail Cut two fuselage trim pieces / x % x 15 long medium-hard balsa Glue top FS extend yond FR about 4 dont glue beyond F7 Make /16 notch trim piece allow pulled together slightly behind FR secured rub berband tape Slip piece wax paper between FR FlO clamp FlO FR Glue FlO trim pieces being careful bond latter FS Cut piece x M-in balsa width F7A Add /16 ply top drill 140 hole #27 bit shown Glue x s-in piece top trim piec es F7 Glue F7A top crosspiece after fitting over /16 ply stall 1 A-in-long 6-32 socket-head bolt washer through 140 hole Use small piece tape keep bolt fall ing out Trim section preformed %2 skin fit between F7 FR overlapping both slight ly Sand bottom edges theyre alignment top trim pieces mate F7A FlO CyA skin trim pieces Aft hatch Razor saw remove aft ex tensions trim pieces cut through F7 Remove hatch section com plete application CyA F7A FlO piece plastic soda straw epoxied place will keep 6-32 bolt trapped Sand %2 skin flush F7A Install F8 F9 through slots cut formed skin Small pieces triangle stock add final rigidity unit Complete hatch front hold-down placing piece /16 ply 6-32 blind nut under two x 3A-in fuselage crosspieces Line up hatch snug up 632 bolt Use Du-Bro ball wrench inserted through small hole skin CyA ply place remove hatch epoxy ply cross members two /16 ply aft hold-down tongues installed follows Shave off excess material inside hatch trim piec es 6-32 bolt masking tape rear holding hatch place work through opening fuselage bottom Position ply tongues tack CyA F9 %2 sheet bond FS Remove hatch ep oxy tongues Again bolt hatch secure Continued page 136 EffectiveJanuary 1989 Fox motors except Combat supplied muffien some time have using soft sell approach columns customers direct some excerpts letters have received Eric larson Pine Grove CA Fox Mfq Yesterday bought Fox 4OBB Delux thefirst Fox engine have owned some apprehension bought anything other OS engine have burned before buying off brand engines Today am convened Fox 40 40SF similar both start idle magnfkenrly cant tell dfference power thats similarities end Fox 40 vibrates less easier adjust lighter comes great spinner costs hoff much American made hove now made sure everyone myflying club knovs what great buy Fox engines THANK YOU FOR QUALITY PRODUCT Eric Branham Paris IL r purchasing 40 Delux year lam impressed performs exceptional lot better OS Are planning replace Eagle III update 60 size will assured will first line purchase Jon Armitage Indiana PA ed send letter praise about motors motors used flew C/L FE started RC about year ago decided try Super Tiger 25 0S4 Stroke 40 good came bock Fox power quality handling allot decent price engines popular field Will Sgarlat Cape Cod MA note tbonksfor youve donefor wonde4izl hobby yourflne engines Dukes Mixture column temfic service offer us accidentally smash up Fox engines beyond what theyd care tackle repair Westley Keller Gouster OH have meaning drop linefor some time 40 motor trouble replaced put icing cake will never run anything planes unless says Fox side performance service says subject Decals present time am running 8 Fox engines am requesting Decals accordingly Alse lam lookingforsvard coming Eagle 4 Keep going best engines world Barry Doughty Absecon NJ placed old OS Max 60 Clipped Wing Cub Top Elite new Fox SOBA WOW what engine no vibration started right out box no adjustments Idled good accelerarionfrom idle full bock reenfic Weight bigfactor purchasing SOBBRC lighter OS SuperTigre Come etc Also must add replacement parts economical foreign imports Coming landing motor idled down beautifully settled infor great landing Again engine something else loads power very easy onfuelfor SO size engine John Holder Ob Seeverson AL ne obviously drfective else would have pulled wings off Aerostor 40 Seriously very pleased myfirse Fox engine Vaughn Kempf Modern Hobbies Miles City MI wanted take afew minutes send afew wards praise way talked three customers buying Fox 4OBB Delux motors quite impressed motors have couple observations pass along First havefound performancefigures seem little conservative modest measuring 14000 plus Master Airscrew 10 x 6 props using Royol Pro Tachfor readings Idle lower other 40 Ive ever ron realiable during spins soaps inverted idling Kenneth Wilson Schenectady NY know lam loyal satisfied Fox engine user over years Ive owned U/C 36 Fox R/C engines such Fox 2S early Fox 40 Eagle III currently own 2 Eagle Ills must compliment quality value youve designed built Fox engines Corey Wills Perryville MO compliment having thefinest engines made Several myfriends have flying Fosfor past three orfour years wouldnt give up other engine somewhat higher prices lately still cant beat affordability reliability performance Doc Matthess Wichita KS drop note express pleasure over engine Fox 45 Excellent midrange easy start set super neat spinner set up andfinally sofe incredible power larry Maltman Winnipeg Canada k kindlyfor promptly courteouslyfilling last order appreriate excellent service seems todays hurried ways few businesses take time what just seemed naturalfor Fox Mfg Ca have active builder/flyer since 1962 Myflest Fox engine reliable durable lam also happy state additional 17 Fox engines have purchased since 1962 running reliably consistently lester Goldsmith Action Hobbies Memphis IN riting tell Fox 60 Heli Engine has cranked run flawlessly rightfrom start Enclosed pictures Schluter Scout 60 1 did test run engine before installing believe really necessary because just cranked Fox 45 Heli today new unrun except byyourfacroryj new Schluter Junior though test run too cronked ran immediately idled perfectly very smooth believe word getting around Fox best buys now because compression al ways good making starting good power output always above average tops confirmed test articles magazines Life always goad because appear cut corners importantfeatures such bushed conn rods grades material Ruts always hand tap factory service unmatched anysvhere Eugene Mathis Daphne AL Fox 4OBB out Clubfleld last Saturday kicked tires lit thefires took off leaned bit andflight number twa went whole tank really started come Flight 3 very spectacular pulling vertical stall turn Ifinally throttle off hung prop just kept going veritable hoss because Kaos 40 weighs ran Walter Pawlukanis Oakhurst NJ normally write manufacturers anyone else asfar goes matter offact cant remember wrote last However am really impressed Fox 4OBB Delux WOW what engine have mounted 40 size Ugly Stik type airplane about 2-1/2 gals offuel through irsofar Eyes popping started right up required some hi 5 peed adjustment Since until now has gotten better better Vertical performance just doesnt quit ttle response certain sure Im willing wager bet money its certainty AlMancini las Angeles CA te thank youfor incredibly fast turn around phone order Onward Upward Andy Keeley Memphis IN ht Eagle III put 6-1/2 pound airplane next day flyingfield great airplane vertical performance needed Thank great engine also like Dukes Mixture Model Airplane News Happy Flying Manufacturing Company 5305 Towson Avenue Fort Smith AR 72901 Phone 501 646-1856 April 1989 35 Freebees available time new color catalog new price sheets parts sheersfor 1988 1989 model motors wauld appreciate receiving seffaddressed envelape twa stamps however masking tape rear Drill through sides tongues #29 bit 136 tap 8-32 nylon screws Replace fit hatch Sand Y32 skin flush FR Fit forward section formed sheet glue place hatch place shave sand trim pieces shape F6 aft FS Cowls nose cowl adds needed weight attaining correct center-of-gravity aft cowl merely cosmetic lost foam method can used make fi berglass cowls Styrofoam forms made undersized allow cowl wall thick ness Use batches Hobbypoxy 2 four layers 6-oz cloth strips nose cowl aft cowl takes layer same size strips Add final layer 2oz cloth both units After epoxy has set gouge out foam use acetone remove resi due ply cowl mounts installed last epoxy strips fiberglass cloth nose cowl should have final weight 4 oz Use hex ball-driver reach hid den socket-head bolts use extended sides FS shaped balsa blocks instead glass nose cowl may need add nose weight correct centerofgravity Empennage Its important build sta bilizer light strong aft engine right trying shake apart Build main frame flat over plan protected wax paper Notch tip pieces R-in-sq hard balsa spar Add 10 rib supports hinge blocks Dont forget A6 ply trailing edge doubler Trial fit frame fuselage Posi tion A-in-sq balsa inboard ribs hug fuselage sides sanding ribs ap propriate contour procedure allows unit covered prior attachment fuselage Add remaining ribs fit four A-in vertical-grain braces will epoxied place after stabilizer has covered attached Assemble elevators /I6 dowel block sand shape 015 alumi num support formed around dowel Build upper lower fins associated rudders upper rudder has groove its lower edge accept Y32 wire torque rod Fit upper fin place over F8 F9 lower fin tail post A-in birch ply predrilled A-in bit hinge point Make lower fin including /16 ply bearing piece %2-in hole lower torque rod trailing edge fin clamped glued after hard wood block formed tail wheel wire has glued place Add soft balsa filler set aside Rudder torque rods make upper torque rod start cutting two pieces % music wire making 2 sec ond 4/2 long Make 900 bend 1 end Solder -in sec tion K&S 125-in-sq brass tubing its end 3A-in leg Allow no solder outside brass part Tinning wire first sweat ing brass wire makes nice neat job Make upper torque rod Solder /2in piece 125-in-sq brass tubing onto end 1-in leg 2%-in piece 156-in-sq brass tubing slipped over 125 tubing ered Lay upper lower torque reds flat board relative positions Assem ble lower tube upper tube telescope mating parts one-fourth inch Tackle upper wire assembly soldering iron remelting upper joints applying very light pressure both 900 arms resting flat sur face arms will now lined up parts assembled specified before remelting lineup risk fusing whole assembly making un usable Telescope two parts checking ease fit dimensions Assembling covering Finish fuse136 Model Aviation ELECTRIC SEMI-SCALE Radio Control Sport/Trainer Wing Span 67 3/4 Length 37 1/2 EIII see Local DeCirn PAUL K GUILLOW INC WAKEFIELD MA 01880 Push-Pull/Masters Continued page 35 lage assembly fitting top batch canopy area sealing front fuel tank area epoxy Fl P2 provide fueltight compartment protect electronics carried below Assemble controls sup porting necessary Add triangle stock close up compartment F13 Cut lower hatch provide retaining Attach Halco strut four 4-20 aluminum bolts plastic nuts wheel pants sawed 4 x 12-in balsa block thick Reinforce A-in birch ply Resist tempta tion carve sand wheel pants nice streamlined shape need cer tain heft order contribute drag land ing time Remember although two engines idle frontal drag area single engine After final sanding vacuuming free dust cover individual parts favor ite material Coat both firewalls epoxy inside out covering stabilizer leave bottom center section open Position stab attach CyA checking align ment carefully Pass lower torque rod through /I6 ply bearing Fit lower fin slot F12 clamp lower tail post A-in Lite Ply fuselage cross brace Square up epoxy fm leading edge inside fuselage Attach A-in ply lower tail post A-in Lite Ply cross brace using CyA Glue four vertical-grain A-in braces stabi lizer fuselage sides Close up stab center section Push lower rudder over torque rod epoxied hinge point Make sure treat center hinge point pe troleum jelly expect hinge action af ter epoxy cures Angle upper torque rod position through its ply bearing join two torque rods Fit aft hatch place bolt Assemble upper rudder its hinge point Line up two rudders epoxy upper torque rod groove bottom rudder Install elevators attach 015in aluminum support aft firewall two No 2 screws Secure tail wheel tiller loop lower rudder small rubberband bound tightly possible tail wheel off set rudder pushrod undersize minimize servo shock engines place pipe up fuel systems using pressure both Use Hig ley Heavy Hub Master Airscrew 10-6 prop up front lighter Zinger 10-6 wood pusher prop rear combina tion will give extra 3 oz up front counts Install electronics feeding anten nae back through upper lightening holes snaking out three holes left side just above stabilizer Flying single servo controls both throt tIes using Du-Bro EZ connector ca ble arrangement servo throttle linkage can independently adjusted Set front engine reliable idle high-trim position Low trim should cut engine Kill front engine set up aft engine same manner Setting up engines manner makes unlikely both can cut off precisely same time However pre sents no problem since engine should fail final approach go-around single engine readily made desired Its unnec essary synchronize engines just have both running well Its important aft fuel tank car ried high possible within tail sec tion use piece l-in-thick foam under tank Since engine pusher configu ration does have rain carburetor air tank location relation needle valve critical order avoid early starvation fuel level lowers small sheet metal scoop attached direct rain air carburetor throat Although worked ef ficiently carrying tank higher much less trouble equally effective Keep simple Note also rear tank clunk stalled forward position Having used clunk pickup both directions pushers Ive found forward installa tion satisfactory requires much less fuel line As aircraft having pusher propel lers special precautions must observed prevent debris going through Continued page 141 April 1989 137 1t I] iyu 111 E1ii RE SHOOTING DOWN HIGH BALSA PRICES WITH SUPER QUALITY Satisfaction Guaranteed Direct Only BALSA SHEETS 36 48 30 BALSA STICKS 3648 16233 332240 18243 316249 14256 132337 20337 163374931 33234458 37 1835471 45 31636282 55 14373 95 61 516395110 38355124 71 123110155 34 3165191 116455 7648 332470 9456 18 48010666 316493122 75 14411013484 38 4165225139 12 4225261 MATCHED SHEETS 42 3324100 164109 3164120 144131 116 14 116 36 116 12 332 14 332 35 332 12 18 18 18 14 18 36 18 12 316316 316 38 316 12 14 14 14 30 412 14 34 141 516516 3838 3812 3634 381 1212 1234 121 58 55 34 34 Os 10 14 10 12 16 08 11 12 18 11 17 22 16 19 21 34 40 21 27 32 42 52 36 46 56 48 67 16 18 24 16 20 30 24 26 30 44 55 28 37 46 55 70 53 62 78 66 90 BALSA HOT LINE Call 806 745 6394 10am 6pm Central Time BALSA TRIANOL ES 36 25 8830 35 45 55 BALSA PLANKS36 86 0 00 1480 1123275 1124360 22225 23325 24435 33495 34668 TAPERED SHEETS36 142 65 143 65 382 83 23120 LONE STAREPOXY 90L sI--S 95 5so598 iSoro598 38 rro598 CUSTOM CUT CONTEST BALSA Sheets Piece ed Close Tolerances AAA Grade Dried ped 100% a serious modeler want performance must try 4-6 lb balsa LIGHT 4-6 LB WOOD 1 32 3 1/203 1163 332 3 183 3 163 143 383 123 343 13 1 164 3 324 184 3164 144 384 124 36 53 53 53 63 77 89 104 122 158 242 335 83 100 115 133 158 236 322 TRAILING EDGE 36 14132 51611439 3811246 12270 INSTANTOLUE 1 o TSck 298 10 750 298 20 T5ck 550 20 150 550 BASSWOOD 316316 31614 31638 31612 31634 1414 1438 1434 3838 3/812 3634 12 1 2 1234 BUNDLE DEALS 28116336695 201164361035 20332 336865 15332 436955 151/8336738 101/8436895 15318336920 10316436835 1014336655 101/4436830 103/8336870 53/84 36655 51/2336540 5124361580 10-3324 48885 518448500 5316 4 48600 514448645 48*NEW* 26Hundreds 30 38 46 cessories 60 ishing 42 materials 80 60 #10 SASE 70 atest 90 catalog 100SPRUCE STICKS 3648 18 181725 18 142026 18 3/822 32 316316 28 38 14 3/84055 14 124585 3/8 3/84969 38 126577 12 I/O6688 12347597 SPRUCE TRIANGLES 38 38 12 1 2 34 34 1846 18412 146 HARD MAPLE 1 4 36 3838 38 12 3834 1 2 IRCH DOWELS 18 316 14 516 38 18 40 45 50 58 68 36 09 11 14 25 32 3PiVBIRCH48 16412620 13212445 11612455 1812485 SPLVBIRCH 48 33212588 1/812 625 36316 12625 4714 12828 8438 12725 8112 12900 LITE PLY 48GROOVED LGMOUNTS lllachea 15538341840 3153834/532140 2501234916/45 495 V. Push-Pull/Masters Continued page 137 prop author owned full-scale Lake Amphibian pusher years found protecting propeller loose nuts bolts fishing rods always major concern twin engine push-pull arrangement especially vulner able front prop can kick up stones starter cables wiping cloths etc promptly present rear prop digestion Flying twin pusher also requires special watchfulness flight Push-Pull 240 near-fiasco Immediately after takeoff carburetor aft engine came loose moved pusher prop promptly seif-destructed en gine full bore extremely unbalanced tore itself firewallbefore fuel starvation saved day whole scenario lasted about three four seconds pilot Ray Doan brought ship back single engine thorough preflight check would have spared pusher prop main thing remember get Push-Pull smoothly aloft advance throttles steadily during takeoff Ground control will positive no torque cor rection required Clinibout will solid watch slice through ether sound twin 40s something else Radio Technique/Myers Continued page 37 RC34 through RC37 vice versa 2 next condition change comes out mathematics frequencies coo Image interfer ence will return few SC455s Some folks will remember 7296 Y/W used image 7208 Bn/W Well SC455s RCll-14 RC57-60 can af fected Tx within band have local oscillator wrong side assume manufacturers simply wont sell SC455s channels Besides image coincides exactly Common Car rier Tx frequencies RC Tx helps Rx low LO have possibility imaging TV4 RC44 problem know love So see nothing simple cure above simple Use dual conversion Rx entry-level RC system almost always uses SC455 manufacturers will have narrow-band pay attention proper LO signments keep off RCll 12 13 14 34 35 36 37 57 58 59 60 Jim didnt mention channel doubt above manufacturers just arent selling Indirect Interference condition comes out numbers called Second Order Intermodulation Product Interfer ence 21M generated ANY PAIR Tx operating 23 RC channel numbers apart difference two frequencies modu lated 460 kHz signal often goes right through 5C455 detected interference Think 21M generated JUST ONE PAIR Tx might hit OWBAM SC45Ss SO channels simultaneously including own Rx depending signal strength Rx tenna RECEIVER CHARACTERIS TICS Nobody uses odd-numbered RC chan nels RCll 13 15 today dont see 21M Can predict what will happen give 25 odd-numbered channels another service Now remember discussing RE CEIVER problems assumption everyone already using Gold-stickered narrowband transmitters Practically Tx built since 1987 good enough warrant sticker easiest way avoid problems listed above use dual-conversion receiver dont have block out ANY channels Jim manufacturer offers best dual-conversion receivers market relatively cheap recommend letter appropriate person named end last months column narrow-band 5C455 can work cause interferences discussed above z off 455 kHz intermediate frequency IF dead like 31M Narrow-band SC455s exist example Bob Aberle recently tested Polks Pow ermax Merlin system receiver 5C455 RC46 its LO low side An IF bandwidth 6 dB 2 kllz claimed nothing quoted 85 kHz Merlin performance meets AMA guide lines except ins LO wrong side does use dual conversion DC outper formed 1991 DC system have tested ex cept its PCM computer slow April 1989 141 LONE STAR MODELS1412 1623 S7th St Lubbock TX 79412 cant 46 Handling charge pay UPS Add $250 COD $300 extra PP APO FPO StateS accept Vs4 Master Card personal checks COO 6% 368/n TenaS US crrency Mnmom Wood Order 51000
Edition: Model Aviation - 1989/04
Page Numbers: 24, 25, 26, 27, 28, 29, 30, 31, 32, 34, 35, 136, 137, 141
NO OCR TEXT NO OCR TEXT Left aft hatch hides 6-oz fuel tank tar rear engine natchlfin unit rejainca wuin trappea o-a aovw-neea oumi ana iwo O-J nylon screws Right Removing front hatch reveals plywood keeper holding two wing dowels place Under Sig canopy Williams Bros pilot ready go wing bolt covers made aluminum cigar wrappers have painted match Left simple onset tail wheel tiller lessens servo shock during ground operations Right Fiberglass cowls nice addition model difficult make 4-oz weight nose cowl helps balance aft cowl may omitted desired Fuselage Use piece A-in Lite Ply 12 wide 48 long Determine whether want separate fiberglass nose cowl built-up front engine compartment opt built-up style add 4 part labeled PS front FW plan Placing Lite Ply under fuselage side view locate end points straight lines pin pressed ply Con nect points using ball-point pen Hav ing basic lines straight makes easy work drawing sides curved sec tion wing saddle can traced few pieces carbon paper slipped between plan plywood Cut out PS sand down lines shown plan Trace second side first cutting sanding outline Clamp two sides togetheror socket-head bolts attachIng cowls can reached hex ball-driver hold together small pieces masking tapewhile block sand identical size errors tracing inevi table Make sure edges square 6 x 12-in piece /16 birch ply used nose doublers F4 Use FS template Make cutout section gear mount P3 Apply very thin coat 30-minute epoxy doubler P4 position FS making sure allow firewall FW Use weights clamps until ep oxy sets Make right left fuselage side asme Haico B106-8 strut Du-Bro axle K&S 062 aluminum clip hold rugged plywood-reinforced wheel pants place sembling its respective birch nose doubler Make two aft doublers Fl 1 attach thin layer epoxy Allow correct spacing aft fire wall FR two small doublers F6 can also attached using white glue suggested sides resanded en sure upper lower edges true identical sides placed inside surface faces up carefully draw locations Fl F2 F5 F6 F7 Make firewall FW laminating A-in birch ply Cut FR X6-in birch ply Draw horizontal vertical thrust lines both sides firewall will using engines different makes pick heaviest tractor front unit engine including muf 26 Model Aviation DESIGNED BY AL MASTERS IG WC 813 CRrJOPY FI0ERGLR ccWL--pwORKW OP&BOJTOM 3A6LA GOLD8ER%RLBR_ \\ /axBf4L N / 2 _____ NGL016 pIY IV 13~gW 3/ 15 pUI y8%Y I3R$A Qj 4EET 1~ 4 C ~RVY 2 Weigh wing spars determine two heaviest Place 01 heavy spars right panel other left fler attached its mount position firewall canting counterclockwise see front view Hold thrust line indicated allow muffler clearance proper carburetor location respect fuel tank Mark drill firewall stall four 6-32 blind nuts three tend use fiberglass cowl back side aft engine side mounted exhaust down standard mount such Dave Brown 4045 can used light weight variety shown plans engine should placed close FR possible still allowing clearance Tatone EM 4Oss manifold Lite Ply spac ers can used between FR mount mount arms longer neces NOTE FRONT ENUINE INSTALLATION-TUT CHORE FOR CORRECT LOCATiON OF EARNURETOR IN RELATION TO FUEL TANR ATTACM MOUNT TO FERWALL WETTI FOUR 14-32 T-MJTS N BOLTS LOWER MATCR CR LITE PLYF13 1-1 II lOOT UTE PLYII MUFPLER LUCATIONfl I504 RALSA TRISTUCO I/S PLY 4.BOTCH FUR MAPLE MOCR IIIII I/U RALSA TRI-OSUCI I/O PLTiiAjTj I ICONSTRUCTION 010 iT - - NOTE SERVO SHOWN FROMLM PLY SERVO TRAY ELEVATOR AILERONS IRUODEU I/O PLY WOOD I/H PLT IHEMUVAMLEI 6 ~ITEj I/lU PLYPUPLY WITH F-IS I/O CITE PLYHI/lU PLY14-02 TNUT 0101EV HEAVY---2~ ATCH -- OUR IOUZI -UIIBUZI AU TWO-CYCLEFAIrSUORO S-b TUSOIOU MALSA--H \iiiEAGNEII-V TUCKI IF BALANCE IFUAMI SERVO04 L PLY WITHOUT I 1CUSYRUL MASTER AIRSCSEYR 0-14RATT LYSUPPORT GOLORERO 2 SONNER\V- 0-SO ECE1YLR 11400 EI51 TROT--I IFLUM001CR VUNISE HEAVY WALL FIREROLASS COWLP13 IA PRAX 4 00 COMPLEVEUTE PLYHATCH HALCO BlUR-UI/H -005/4 ALUM ROLl 002 005 ALUMLASOINO SEAM H OTLUS SLYTIVI LANOINO OEAR CLIPLIURTEN RAND TU FIT/ ER PLYWOOD- I/O PLY lBALSAZi4IA OOR LITE ATTOEB WITH 004-40 NUTO BOLT TO.. 145O SERER/NAT EAO _FUSELAGI VI E 000140 040 REMOVE NOT FROM RALCO UEAR TAP FOR 001400 VOLE -GZYS 010 500 04 sary should cropped off save weight Use three 4-40 blind nuts bolts install mount Remove mounts before continuing fuselage con struction Cut remaining fuselage components materials specified Note Fl A-in birch ply includes switch cut out F12 F13 shown actual length plan can traced piece Left Fuselage parts Lite Ply sides bottom conjunction birch ply balsa keep weight distribution under control No tice two pre-formed balsa skin pieces fuselage side dou blers have already glued place Above Completed basic fuselage straight lines design signify easy layout 28 Model Aviation wing ribs Irst cut out witn construc tion tabs left provide easy method building necessary wing washout Full-Size Plans Page 188 F-I2oR LITE PLYAFT ENGINE MOUNT 1/H Lire PLY SPACER ID OH 4 REOHIREBI 141 HOLES TO WATCH L/2BALSAENGINE CASE THFSTOCHI/TDA WALSH -I 052 KS S--ATTACH TO F-fl WITH LS KS/B BALSAALABINOM131 4-40 T-NUTS S BOLTS BLOCK3/8 SOFT BALSA TAP FOR I/O-ZOkS/H 010 FIHEHOLASS COWLSPINNER -I -flE-KAF-Il III iCANOPT- COCKPIT AREA IAIII III I I _ -II __IIIII I I/ZBALSAI OW PL F-Nil I11 ...I II THFSTOCK HATCH TONGUE - I F-ri II 711 UiI i -----ZINOES 10 K Fl/A H-SO RH HALTEPOXYOx 3/4 BALSAPOSHEK PHOP TRAPPED E TOP VIEW EPOOTPSAS SYWAW'\I/B LITE PLY 1/1K PLY--.....WAKE I/H TM-STOCK I 3HBALSA0TRIBTO L~--IF-SROBART DOW F-SL_________IT-NOT K-D2 IEPOOTIOs HEMOVE FOR FOEL illiiiTANK ACCESS IIIII pF-6Ul II 04A IRE ORR IN PkASYIC ISO 121 SODA BALSA F-R 1540KF-fl T I-P/KS/IS PLYWOND Fl-Ia 3 I/2T ____ 2-I/H L 1/2 3-I/O 3/sO WOSIC WISE -1/1K PLYWOOR - R 156 50 040K lOSSO 1OYEW MWSOWER IAFTER UFE OP WITH 15K SQ BRASSASH TO SHAPE TUBENOTE RUBBERS AWE 0*EL A2EAEJaLI I42AALKZ2RN 125 50 BRASS _____I/U BALSA SHEETTUBE SHER MW HODDEK ISOFTISOLDEK - 'I/IHPLTWOOO I/H LITE PLY SPOCEKS 3/32 BALSA-NBLENO 3/32 I-D4 AlASHEET7AT WATER 2 TI -.LL/TUPTYHO FOR B52 NYLONFS SCREW 121 STABILIZEHi~ -1/1K PLYWOHO LS LITE PLY NOTE AFT EWAIRE COWL IS USHT WEIGUT- LAYER H DO LOATH PLUS LAYER 2 02 OLSON AFT EWAINE 500k ALL BATEHIAL MEDIUM BALSA ARLESS SPECIFIED OTHER Sb WC HID CANOPY RE-WORKEOI niN - FRAY F-7"HATCH BALSAII F-00F-B STOCK vzziU ALL LYBx 3/4I --. SOFT BALSA FILL F-HTIWVOKD/B.-24T1 ALSAI________ __________________-N I/ZBALSA F-Il 01 "CLuRK FOG THI-STOCK .----Io --STABILIZ VL SOALSOWALSA I/BBRLSA R-BLOCK SHEET I/O BALSA THI-STOCKF-6ALS PLC T AID- H HEOKIHEB~----4-40 BOLT-REROOC HEAD OR 1/H LITE PLY PLY N ESOAKS/AF-90TH 00 BALSA BALSABASIC WIRE IEf7iLSOFT BALSA PLYCLUMP N SLOE FILL --1SPECIFICAT IONS - SECT A SAWS WING SPUN HO COT OOT AFTER/550 AREA SQ 14 3/52 BALSA SHEETZNZATTASH AFT-PLYWOWOWEISHY IFUELEDI 9 LSC HDZ ASSES BLY IW PLYMAKE 2WISH LSAOINU OZ AIRFOIL.IH 7 SERI-SYM 34K BALSA SHEET L/$3JWITB WASHOUT POWER TWO 00 ENOIRED F-IaF- IF-S-HATCH2-CYCLE TeNUE F-H BLITE PLY 121 MODEL AVIATION PUSH-PULL 240 TWIN ENGINE R/C MODEL DESIGNED BY AL MASTERS TRACING BY JOE DEMARCO sanded correct outline cut apart finished components should include drawn centerlines aid lineup during sembly Cut lightening holes F12 af ter separating F13 Glue six con struction aids F12 Make preformed 3A2 balsa skin aft fuselage section will need some household ammonia cardboard tube approximately three-inch diameter core tube Christmas wrapping paper works fine Left The wing panel begins take shape has turned over show construction tabs Above bare bones horizontal tall show lightweight structure Because engine vi bration1 must rugged conventional model April 1989 29 upper rudder fitted square brass tube assembles lower rud der tall wheel hatch offers easy ac cess fuel tank supplying aft engine Wheel pants cut 1-in balsa block reinforced 1/-in birch ply carve nice streamline shape ex tra drag helps slow model down during landing model twin has frontal drag single-engine model finished nose cowl foam plug roughed-out aft cowl plug aft cowl can omitted front cowl adds 4 oz much needed nose weight lightweight aft engine mount used help get right CG Select two 7-in lengths /32 sheet 6-in-wide stock Trim balsa 5in width soak ammonia STABILIZERS/B SO BALSA LEADING LEFT STABILIZER STARRI PA CITE PLY BEFORE I/B lI/A BALSA~OsA SEE SHEET RIBS ORE OBOESTRISTOCK VBx I/A BALSA RIB SUPPORT I2OBALS S/IHZ I/OFiLL BALSAJ 7BABORT3OBI/OSA HOBOij BALSA SPAR CSCRAP BALSA 01 I/Bx I/O BIB SUPTS015 ALA /1/ AOR PETLOWER SURFASE INSET / 3/0 SOFT BALSA SHEET S/TOZZRALSASHLfl IBS-SAEETI NOT SBOSAN OR LEFT / ROSA SARIS1/5 50 OARS 3/32 SCRAPTA CONTOURBALSA BALSA RIBSvO BALSA SHEET BATE TRIAL FIT STAR TO VFOSELAAE BEFORE ATTACRIRS VA SO BALSA I FILLELEV-STAB SECTI LVI I/A BALSA I COVERING STAB IIAVA SCREAj~ PUT 7ORILL FOR ipL5/32 B BI I/A BALSA LEASISS OIS ALUMEASEy 0/01122n-p-iiBALSA /_____UWING ____ I_ ~1I _____ PLAN TOP VIEW _______I BALSASBIItZ BALSA 5/52 BALSAI I/B xl BALSA LE3/Az OBEET RIRIO V4x S/B I/B I/O BALSABALSA SOB LEABISA EPSEI/H BALSA2 RISER 5PM SHEETWITHOUT CAP S/SO RALSAVA 120BALSA WISE SHEETINGSPARS 5/52 BALSA least five minutes Blot wood pa per towel wrap around tube using masking tape hold place Set balsa skin aside allow air dry thor oughly Save ammonia another proj ect Begin assembling fuselage over top view plan Support sides up right glue firewall place using F5 spacer Use white glue since will allow time lining everything up Place weight such ordinary brick top front edges fuselage sides clamp FW place pull aft fuselage section together time lower fuselage line forward F5 straight weight will keep setup square work surface until glue sets Attach FR using white glue 10-minute epoxy aid clamp Hold sides together attach F6 cyanoac rylate CyA Add two 14 x %-in crosspieces fit Fl 1 Check position WINO L DIHEDRAL DETAIL NOT SCALE F5 tack CyA Make relief notches Fl clear blind nuts back side FW Force Fl position will aid correcting misalignment front firewall F5 attach CyA Install /6 x A-in hardwood servo rails make servo tray A-in ply fit After gluing F3 place set fuselage asideyoull com pleting laterand proceed wing Wing Trace cut set ribs using pattern make second set Fin ish sand ribs pairs draw chord lines shown both sides rib Cut dihedral braces draw two centerlines indicated both sides leading edge brace Cover wing plan wax paper plastic film before pro ceeding Cut four straight x A-in balsa spars length point weigh four pieces distribute spars avoid using LS 1122 SUB LEAGIRS EDGE 30 Model Aviation Due heavy side loads engine weight necessary use birch ply hardwood lower tail post system Note soldered upper lower torque rods Full-Size Plans Available Page 188 I/B BALSA REMOVE FOR SERVOSMEET IFI 2 Q1 — U AILERON SERVO-L SOFO RULVA- 01 LI lb 0I RALSA OREET IOFT ALSA SO EDGE S/IA DIA DOWELS WINO SOLO SOWN I] NOTE BIBS 2 TRRU 12 ABE 5/32 BALSA SHEET 3 [I 45678910II12 111 II r I OR BALSA SHEET WISH YIP FRAMES I/R PLVWDODV UPPERI/R PLYWOOD_______ I/R LITE PLO1QWiR t __ LEADING EDGE VA PLYWOOD S/DO RALSA SHEET TVP H BOVVOMjSERVO DOONYDIHEDRABRACESWING TIP DETAIL HAL NA S/HI/O /0 BALSA1II______ 71 FILLHOII WINO BOLT PLY4 ACCESS I/O BALSA SUBEE -PUSHPULL 240 3/BR I/O OIL STOCHL --TWIN ENGINE R/C MODEL RI LIGHTENINS ROLES ISV BTA FUSELAGEI/IS BALSA SHEETDESIGNED BY AL MASTERS SIDEBATH SIDESWORK SURFACE I254NTRACING BY OE DEMARCO IIIII ALL RIGHTS RESERVED FILL ISO MUSIC IKE EPOOVI / I/B BRASS TUBE EPOXY TO OK aileron servo carried well forward wing Z-bends A-ln music wire pushrods used connect servo Arm II I-V117j4I TRI-STOCEILIli-TiI #~p Iftv 11-----S I/B LIVEF4[~SRWVAII DLV April 1989 31 receiver battery pack three servos nestled lower nose section below 12oz front fuel tank dual take-offs 5-26 servo controls throttles both engines Left Both K&B 40 05 4OFP have used tor tne aft engine witn equal success Lite Ply spacers firewall provide clearance Tatone manifold Right fuel tank nose compartment sealed keep fuel leaking electronics below two heaviest same wing panel postal scale coding used Glue lower ply dihedral brace spar halves position spar over plan securing pins weights Position ribs 1 through 12 spar making sure construction tabs resting work surface x %-in trailing edge x /2-in leading edge pinned place ribs aid lineup space between ribs 1 2 pro vides leading edge brace will slipped later After making sure ribs perpen dicular work surface CyA ribs spar leading edge trailing edge Fit upper spar glue place Block sand upper surface trailing edge slightly follow rib contours Select four sheets %2 balsa 2-in stock upper lower trailing edge skins Check weights using two heaviest opposite panels Hold metal yardstick edgewise across ribs board sheet edge certain sheet line will straight attached ribs high rib can carefully sanded down dont worry about low rib point Turn wing over Using piece wood such ruler press wing down ward contact %2 sheet bond ribs CyA Work about three ribs time starting rib 1 skipping low ribs Maintaining straight sheet line out waves important gluing rib chip A-in triangle stock can used support skin low rib cap strips added later will hide multi tude construction errors Build wing tip attach rib 12 Center tip rib chord line leading edge 4 x %-in trailing edge balsa filler trailing edge tip will allow block sanding fit con tours %2 sheet aileron Attach tip webs will final sanded after rib caps place Add four hinge supports vertical-grain %2 spar webs between ribs 3 12 Fit rib iF place panel inch off work surface rib 12 set iF perpendicular work surface glue trailing edge spar notch tack gluing leading edge Note iF shown actual length plan reaches leading edge strip Allow space spar notches fit dihedral brace mating spars later Set panel aside construct oppo site panel similar manner completed second panel work surface fit two panels together El evate first panel 2 per draw ing push lower spars together until butt Slightly bevel spar end ob tain good fit upper dihedral brace slipped alongside upper spars clamped using least two clamps side wing centerline Make sure %-in dihedral brace fits flush slightly below spars sanding down later will difficult Add leading edge ply brace clamping same manner Rib iF will have razor sawed shorter Make sure horizontal centerline leading edge di hedral brace located correctly ribs 1 2 both panels bottom edge of servo mount sec Continued page 34 32 Model Aviation finished model resting authors balancing rack Location correct cxi shoula always determined model before making first trip out flying field idea RC Push-Pull 240 came WW Ii Dornier-335 Reported worlds fastest propeller-driven aircraft its time war ended before could made operational youve ever fuel tank split leak fuel fuselage know important install tank can trust Du-Bro Products manufactures complete line rugged polypropylene tanks 10 convenient sizes 2oz 24 oz guaranteed life against splitting leaking money back tank comes complete soft brass tubing hardware Protruding front lip prevents fuel lines being crimped hard landings Single twin vent design gas conversion stopper available use tank gasoline Cat No 400 Visit local Hobby Shop fuel hook up accessories can Cap Fittings In-Line Fuel Filter 0 Fuel Tubing Kwik Fill Fuel Value Gas Gb Fuel Tank Filter KwkF Fue Pump tion should parallel work sur face wing level upper spar leading edge clamped rear section wing panels butted trailing edge make final check spars run straight tip tip Hit ar eas CyA Carefully turn wing over clamp lower dihedral brace two clamps CyA Add four 3A-in triangle braces ribs 1 2 Complete center section shear webbing cut off con struction tabs Add balsa filler blocks trailing edge bays between ribs 1 iF Carve notch bottom iF accept W2 Install latter gluing flush bottom rib 1 Remove section iF accommodate aileron servo location Wl can shifted neces sary allow space aileron servo stall Wi add A-in triangles support W2 upper lower leading edge sheets attached /16 overhang leadmg edges Wetting outside surface sheets will make forming easier sheet edges will block sanded until leading edge provide flat gluing surface x 1-in leading edge cap Fasten -in -thick scrap spacer along leading edge masking tape Place wing fuselage check saddle area fit Remove wing epoxy hardwood hold-down blocks place temporary x -in cross brace glued near blocks fuselage side support epoxy has cured align wing fuselage hold place masking tape Drill through W2 hardwood blocks Y6 bit held perpen dicular W2 Remove wing re drill W2 A-in bit Tap blocks A-20 wing bolts Bolt wing place drill two s through F5 leading edge Wi Trial fit two /, dowels shown plan Use soft balsa foam filler around the wing bolt holes sanding down center section top sheeting Remove dowls complete wing sheeting rib caps leading edge cap Drill through leading edge cap /16 bit two dowels epoxied after wing has covered Ailerons Cut two aileron cores 3/ x 1-in aileron stock After making lightening holes cover ailerons /l6 sheet balsa Drill four holes hinge pins 1-in bit drill %2 hole torque rod Transfer hinge locations wing drill Trial fit ailerons hinge pins /2 torque rod assemblies alignment correct epoxy brass tubes onto wing trailing edge Remove ailerons final sanding covering Fuselage-wing assembly rmal fuse lage construction Razor saw two slots 34 Model Aviation top F5 sand accept wing dowels make /6 drilled holes oversized dowels inserted bolt wing place Lay small piece wood across top dowels trace its lower edge line location F5 Move down /16 below line just made fit piece A-in ply between dowel holes epoxy F5 Epoxy 3A-in triangle brace under ply Drill /16 hole center through ply tap A-20 bolt Treat hole CyA A-in ply wing hold-down has A-in drilled hole see drawing detail Cut two fuselage trim pieces / x % x 15 long medium-hard balsa Glue top FS extend yond FR about 4 dont glue beyond F7 Make /16 notch trim piece allow pulled together slightly behind FR secured rub berband tape Slip piece wax paper between FR FlO clamp FlO FR Glue FlO trim pieces being careful bond latter FS Cut piece x M-in balsa width F7A Add /16 ply top drill 140 hole #27 bit shown Glue x s-in piece top trim piec es F7 Glue F7A top crosspiece after fitting over /16 ply stall 1 A-in-long 6-32 socket-head bolt washer through 140 hole Use small piece tape keep bolt fall ing out Trim section preformed %2 skin fit between F7 FR overlapping both slight ly Sand bottom edges theyre alignment top trim pieces mate F7A FlO CyA skin trim pieces Aft hatch Razor saw remove aft ex tensions trim pieces cut through F7 Remove hatch section com plete application CyA F7A FlO piece plastic soda straw epoxied place will keep 6-32 bolt trapped Sand %2 skin flush F7A Install F8 F9 through slots cut formed skin Small pieces triangle stock add final rigidity unit Complete hatch front hold-down placing piece /16 ply 6-32 blind nut under two x 3A-in fuselage crosspieces Line up hatch snug up 632 bolt Use Du-Bro ball wrench inserted through small hole skin CyA ply place remove hatch epoxy ply cross members two /16 ply aft hold-down tongues installed follows Shave off excess material inside hatch trim piec es 6-32 bolt masking tape rear holding hatch place work through opening fuselage bottom Position ply tongues tack CyA F9 %2 sheet bond FS Remove hatch ep oxy tongues Again bolt hatch secure Continued page 136 EffectiveJanuary 1989 Fox motors except Combat supplied muffien some time have using soft sell approach columns customers direct some excerpts letters have received Eric larson Pine Grove CA Fox Mfq Yesterday bought Fox 4OBB Delux thefirst Fox engine have owned some apprehension bought anything other OS engine have burned before buying off brand engines Today am convened Fox 40 40SF similar both start idle magnfkenrly cant tell dfference power thats similarities end Fox 40 vibrates less easier adjust lighter comes great spinner costs hoff much American made hove now made sure everyone myflying club knovs what great buy Fox engines THANK YOU FOR QUALITY PRODUCT Eric Branham Paris IL r purchasing 40 Delux year lam impressed performs exceptional lot better OS Are planning replace Eagle III update 60 size will assured will first line purchase Jon Armitage Indiana PA ed send letter praise about motors motors used flew C/L FE started RC about year ago decided try Super Tiger 25 0S4 Stroke 40 good came bock Fox power quality handling allot decent price engines popular field Will Sgarlat Cape Cod MA note tbonksfor youve donefor wonde4izl hobby yourflne engines Dukes Mixture column temfic service offer us accidentally smash up Fox engines beyond what theyd care tackle repair Westley Keller Gouster OH have meaning drop linefor some time 40 motor trouble replaced put icing cake will never run anything planes unless says Fox side performance service says subject Decals present time am running 8 Fox engines am requesting Decals accordingly Alse lam lookingforsvard coming Eagle 4 Keep going best engines world Barry Doughty Absecon NJ placed old OS Max 60 Clipped Wing Cub Top Elite new Fox SOBA WOW what engine no vibration started right out box no adjustments Idled good accelerarionfrom idle full bock reenfic Weight bigfactor purchasing SOBBRC lighter OS SuperTigre Come etc Also must add replacement parts economical foreign imports Coming landing motor idled down beautifully settled infor great landing Again engine something else loads power very easy onfuelfor SO size engine John Holder Ob Seeverson AL ne obviously drfective else would have pulled wings off Aerostor 40 Seriously very pleased myfirse Fox engine Vaughn Kempf Modern Hobbies Miles City MI wanted take afew minutes send afew wards praise way talked three customers buying Fox 4OBB Delux motors quite impressed motors have couple observations pass along First havefound performancefigures seem little conservative modest measuring 14000 plus Master Airscrew 10 x 6 props using Royol Pro Tachfor readings Idle lower other 40 Ive ever ron realiable during spins soaps inverted idling Kenneth Wilson Schenectady NY know lam loyal satisfied Fox engine user over years Ive owned U/C 36 Fox R/C engines such Fox 2S early Fox 40 Eagle III currently own 2 Eagle Ills must compliment quality value youve designed built Fox engines Corey Wills Perryville MO compliment having thefinest engines made Several myfriends have flying Fosfor past three orfour years wouldnt give up other engine somewhat higher prices lately still cant beat affordability reliability performance Doc Matthess Wichita KS drop note express pleasure over engine Fox 45 Excellent midrange easy start set super neat spinner set up andfinally sofe incredible power larry Maltman Winnipeg Canada k kindlyfor promptly courteouslyfilling last order appreriate excellent service seems todays hurried ways few businesses take time what just seemed naturalfor Fox Mfg Ca have active builder/flyer since 1962 Myflest Fox engine reliable durable lam also happy state additional 17 Fox engines have purchased since 1962 running reliably consistently lester Goldsmith Action Hobbies Memphis IN riting tell Fox 60 Heli Engine has cranked run flawlessly rightfrom start Enclosed pictures Schluter Scout 60 1 did test run engine before installing believe really necessary because just cranked Fox 45 Heli today new unrun except byyourfacroryj new Schluter Junior though test run too cronked ran immediately idled perfectly very smooth believe word getting around Fox best buys now because compression al ways good making starting good power output always above average tops confirmed test articles magazines Life always goad because appear cut corners importantfeatures such bushed conn rods grades material Ruts always hand tap factory service unmatched anysvhere Eugene Mathis Daphne AL Fox 4OBB out Clubfleld last Saturday kicked tires lit thefires took off leaned bit andflight number twa went whole tank really started come Flight 3 very spectacular pulling vertical stall turn Ifinally throttle off hung prop just kept going veritable hoss because Kaos 40 weighs ran Walter Pawlukanis Oakhurst NJ normally write manufacturers anyone else asfar goes matter offact cant remember wrote last However am really impressed Fox 4OBB Delux WOW what engine have mounted 40 size Ugly Stik type airplane about 2-1/2 gals offuel through irsofar Eyes popping started right up required some hi 5 peed adjustment Since until now has gotten better better Vertical performance just doesnt quit ttle response certain sure Im willing wager bet money its certainty AlMancini las Angeles CA te thank youfor incredibly fast turn around phone order Onward Upward Andy Keeley Memphis IN ht Eagle III put 6-1/2 pound airplane next day flyingfield great airplane vertical performance needed Thank great engine also like Dukes Mixture Model Airplane News Happy Flying Manufacturing Company 5305 Towson Avenue Fort Smith AR 72901 Phone 501 646-1856 April 1989 35 Freebees available time new color catalog new price sheets parts sheersfor 1988 1989 model motors wauld appreciate receiving seffaddressed envelape twa stamps however masking tape rear Drill through sides tongues #29 bit 136 tap 8-32 nylon screws Replace fit hatch Sand Y32 skin flush FR Fit forward section formed sheet glue place hatch place shave sand trim pieces shape F6 aft FS Cowls nose cowl adds needed weight attaining correct center-of-gravity aft cowl merely cosmetic lost foam method can used make fi berglass cowls Styrofoam forms made undersized allow cowl wall thick ness Use batches Hobbypoxy 2 four layers 6-oz cloth strips nose cowl aft cowl takes layer same size strips Add final layer 2oz cloth both units After epoxy has set gouge out foam use acetone remove resi due ply cowl mounts installed last epoxy strips fiberglass cloth nose cowl should have final weight 4 oz Use hex ball-driver reach hid den socket-head bolts use extended sides FS shaped balsa blocks instead glass nose cowl may need add nose weight correct centerofgravity Empennage Its important build sta bilizer light strong aft engine right trying shake apart Build main frame flat over plan protected wax paper Notch tip pieces R-in-sq hard balsa spar Add 10 rib supports hinge blocks Dont forget A6 ply trailing edge doubler Trial fit frame fuselage Posi tion A-in-sq balsa inboard ribs hug fuselage sides sanding ribs ap propriate contour procedure allows unit covered prior attachment fuselage Add remaining ribs fit four A-in vertical-grain braces will epoxied place after stabilizer has covered attached Assemble elevators /I6 dowel block sand shape 015 alumi num support formed around dowel Build upper lower fins associated rudders upper rudder has groove its lower edge accept Y32 wire torque rod Fit upper fin place over F8 F9 lower fin tail post A-in birch ply predrilled A-in bit hinge point Make lower fin including /16 ply bearing piece %2-in hole lower torque rod trailing edge fin clamped glued after hard wood block formed tail wheel wire has glued place Add soft balsa filler set aside Rudder torque rods make upper torque rod start cutting two pieces % music wire making 2 sec ond 4/2 long Make 900 bend 1 end Solder -in sec tion K&S 125-in-sq brass tubing its end 3A-in leg Allow no solder outside brass part Tinning wire first sweat ing brass wire makes nice neat job Make upper torque rod Solder /2in piece 125-in-sq brass tubing onto end 1-in leg 2%-in piece 156-in-sq brass tubing slipped over 125 tubing ered Lay upper lower torque reds flat board relative positions Assem ble lower tube upper tube telescope mating parts one-fourth inch Tackle upper wire assembly soldering iron remelting upper joints applying very light pressure both 900 arms resting flat sur face arms will now lined up parts assembled specified before remelting lineup risk fusing whole assembly making un usable Telescope two parts checking ease fit dimensions Assembling covering Finish fuse136 Model Aviation ELECTRIC SEMI-SCALE Radio Control Sport/Trainer Wing Span 67 3/4 Length 37 1/2 EIII see Local DeCirn PAUL K GUILLOW INC WAKEFIELD MA 01880 Push-Pull/Masters Continued page 35 lage assembly fitting top batch canopy area sealing front fuel tank area epoxy Fl P2 provide fueltight compartment protect electronics carried below Assemble controls sup porting necessary Add triangle stock close up compartment F13 Cut lower hatch provide retaining Attach Halco strut four 4-20 aluminum bolts plastic nuts wheel pants sawed 4 x 12-in balsa block thick Reinforce A-in birch ply Resist tempta tion carve sand wheel pants nice streamlined shape need cer tain heft order contribute drag land ing time Remember although two engines idle frontal drag area single engine After final sanding vacuuming free dust cover individual parts favor ite material Coat both firewalls epoxy inside out covering stabilizer leave bottom center section open Position stab attach CyA checking align ment carefully Pass lower torque rod through /I6 ply bearing Fit lower fin slot F12 clamp lower tail post A-in Lite Ply fuselage cross brace Square up epoxy fm leading edge inside fuselage Attach A-in ply lower tail post A-in Lite Ply cross brace using CyA Glue four vertical-grain A-in braces stabi lizer fuselage sides Close up stab center section Push lower rudder over torque rod epoxied hinge point Make sure treat center hinge point pe troleum jelly expect hinge action af ter epoxy cures Angle upper torque rod position through its ply bearing join two torque rods Fit aft hatch place bolt Assemble upper rudder its hinge point Line up two rudders epoxy upper torque rod groove bottom rudder Install elevators attach 015in aluminum support aft firewall two No 2 screws Secure tail wheel tiller loop lower rudder small rubberband bound tightly possible tail wheel off set rudder pushrod undersize minimize servo shock engines place pipe up fuel systems using pressure both Use Hig ley Heavy Hub Master Airscrew 10-6 prop up front lighter Zinger 10-6 wood pusher prop rear combina tion will give extra 3 oz up front counts Install electronics feeding anten nae back through upper lightening holes snaking out three holes left side just above stabilizer Flying single servo controls both throt tIes using Du-Bro EZ connector ca ble arrangement servo throttle linkage can independently adjusted Set front engine reliable idle high-trim position Low trim should cut engine Kill front engine set up aft engine same manner Setting up engines manner makes unlikely both can cut off precisely same time However pre sents no problem since engine should fail final approach go-around single engine readily made desired Its unnec essary synchronize engines just have both running well Its important aft fuel tank car ried high possible within tail sec tion use piece l-in-thick foam under tank Since engine pusher configu ration does have rain carburetor air tank location relation needle valve critical order avoid early starvation fuel level lowers small sheet metal scoop attached direct rain air carburetor throat Although worked ef ficiently carrying tank higher much less trouble equally effective Keep simple Note also rear tank clunk stalled forward position Having used clunk pickup both directions pushers Ive found forward installa tion satisfactory requires much less fuel line As aircraft having pusher propel lers special precautions must observed prevent debris going through Continued page 141 April 1989 137 1t I] iyu 111 E1ii RE SHOOTING DOWN HIGH BALSA PRICES WITH SUPER QUALITY Satisfaction Guaranteed Direct Only BALSA SHEETS 36 48 30 BALSA STICKS 3648 16233 332240 18243 316249 14256 132337 20337 163374931 33234458 37 1835471 45 31636282 55 14373 95 61 516395110 38355124 71 123110155 34 3165191 116455 7648 332470 9456 18 48010666 316493122 75 14411013484 38 4165225139 12 4225261 MATCHED SHEETS 42 3324100 164109 3164120 144131 116 14 116 36 116 12 332 14 332 35 332 12 18 18 18 14 18 36 18 12 316316 316 38 316 12 14 14 14 30 412 14 34 141 516516 3838 3812 3634 381 1212 1234 121 58 55 34 34 Os 10 14 10 12 16 08 11 12 18 11 17 22 16 19 21 34 40 21 27 32 42 52 36 46 56 48 67 16 18 24 16 20 30 24 26 30 44 55 28 37 46 55 70 53 62 78 66 90 BALSA HOT LINE Call 806 745 6394 10am 6pm Central Time BALSA TRIANOL ES 36 25 8830 35 45 55 BALSA PLANKS36 86 0 00 1480 1123275 1124360 22225 23325 24435 33495 34668 TAPERED SHEETS36 142 65 143 65 382 83 23120 LONE STAREPOXY 90L sI--S 95 5so598 iSoro598 38 rro598 CUSTOM CUT CONTEST BALSA Sheets Piece ed Close Tolerances AAA Grade Dried ped 100% a serious modeler want performance must try 4-6 lb balsa LIGHT 4-6 LB WOOD 1 32 3 1/203 1163 332 3 183 3 163 143 383 123 343 13 1 164 3 324 184 3164 144 384 124 36 53 53 53 63 77 89 104 122 158 242 335 83 100 115 133 158 236 322 TRAILING EDGE 36 14132 51611439 3811246 12270 INSTANTOLUE 1 o TSck 298 10 750 298 20 T5ck 550 20 150 550 BASSWOOD 316316 31614 31638 31612 31634 1414 1438 1434 3838 3/812 3634 12 1 2 1234 BUNDLE DEALS 28116336695 201164361035 20332 336865 15332 436955 151/8336738 101/8436895 15318336920 10316436835 1014336655 101/4436830 103/8336870 53/84 36655 51/2336540 5124361580 10-3324 48885 518448500 5316 4 48600 514448645 48*NEW* 26Hundreds 30 38 46 cessories 60 ishing 42 materials 80 60 #10 SASE 70 atest 90 catalog 100SPRUCE STICKS 3648 18 181725 18 142026 18 3/822 32 316316 28 38 14 3/84055 14 124585 3/8 3/84969 38 126577 12 I/O6688 12347597 SPRUCE TRIANGLES 38 38 12 1 2 34 34 1846 18412 146 HARD MAPLE 1 4 36 3838 38 12 3834 1 2 IRCH DOWELS 18 316 14 516 38 18 40 45 50 58 68 36 09 11 14 25 32 3PiVBIRCH48 16412620 13212445 11612455 1812485 SPLVBIRCH 48 33212588 1/812 625 36316 12625 4714 12828 8438 12725 8112 12900 LITE PLY 48GROOVED LGMOUNTS lllachea 15538341840 3153834/532140 2501234916/45 495 V. Push-Pull/Masters Continued page 137 prop author owned full-scale Lake Amphibian pusher years found protecting propeller loose nuts bolts fishing rods always major concern twin engine push-pull arrangement especially vulner able front prop can kick up stones starter cables wiping cloths etc promptly present rear prop digestion Flying twin pusher also requires special watchfulness flight Push-Pull 240 near-fiasco Immediately after takeoff carburetor aft engine came loose moved pusher prop promptly seif-destructed en gine full bore extremely unbalanced tore itself firewallbefore fuel starvation saved day whole scenario lasted about three four seconds pilot Ray Doan brought ship back single engine thorough preflight check would have spared pusher prop main thing remember get Push-Pull smoothly aloft advance throttles steadily during takeoff Ground control will positive no torque cor rection required Clinibout will solid watch slice through ether sound twin 40s something else Radio Technique/Myers Continued page 37 RC34 through RC37 vice versa 2 next condition change comes out mathematics frequencies coo Image interfer ence will return few SC455s Some folks will remember 7296 Y/W used image 7208 Bn/W Well SC455s RCll-14 RC57-60 can af fected Tx within band have local oscillator wrong side assume manufacturers simply wont sell SC455s channels Besides image coincides exactly Common Car rier Tx frequencies RC Tx helps Rx low LO have possibility imaging TV4 RC44 problem know love So see nothing simple cure above simple Use dual conversion Rx entry-level RC system almost always uses SC455 manufacturers will have narrow-band pay attention proper LO signments keep off RCll 12 13 14 34 35 36 37 57 58 59 60 Jim didnt mention channel doubt above manufacturers just arent selling Indirect Interference condition comes out numbers called Second Order Intermodulation Product Interfer ence 21M generated ANY PAIR Tx operating 23 RC channel numbers apart difference two frequencies modu lated 460 kHz signal often goes right through 5C455 detected interference Think 21M generated JUST ONE PAIR Tx might hit OWBAM SC45Ss SO channels simultaneously including own Rx depending signal strength Rx tenna RECEIVER CHARACTERIS TICS Nobody uses odd-numbered RC chan nels RCll 13 15 today dont see 21M Can predict what will happen give 25 odd-numbered channels another service Now remember discussing RE CEIVER problems assumption everyone already using Gold-stickered narrowband transmitters Practically Tx built since 1987 good enough warrant sticker easiest way avoid problems listed above use dual-conversion receiver dont have block out ANY channels Jim manufacturer offers best dual-conversion receivers market relatively cheap recommend letter appropriate person named end last months column narrow-band 5C455 can work cause interferences discussed above z off 455 kHz intermediate frequency IF dead like 31M Narrow-band SC455s exist example Bob Aberle recently tested Polks Pow ermax Merlin system receiver 5C455 RC46 its LO low side An IF bandwidth 6 dB 2 kllz claimed nothing quoted 85 kHz Merlin performance meets AMA guide lines except ins LO wrong side does use dual conversion DC outper formed 1991 DC system have tested ex cept its PCM computer slow April 1989 141 LONE STAR MODELS1412 1623 S7th St Lubbock TX 79412 cant 46 Handling charge pay UPS Add $250 COD $300 extra PP APO FPO StateS accept Vs4 Master Card personal checks COO 6% 368/n TenaS US crrency Mnmom Wood Order 51000