Super Doubler II

NO OCR TEXT NO OCR TEXT isa certain beauty uncovered framework guess lithe kind bug bit us years ago says author/designer Shepherd im sure glad no cure Things see vent/drain hole bottom sheet firewall second smoke cham ber screwed place four fiat-head screws holding landing gear fiush sheeting ciean cutouts wheei pants front end cowi ieftwe seethe enginesexhaust stub Perry pump place Notethethrottie pushrod witn bend arm slid over rod engine mount rotated position mount bolts allows easy removal installation engine maintenance right smoke chamber place Silicone feed tube exits pump goes through pinch valve before entering smoker Smoker slipped over short stub end i bolted engine via exhaust nut Left Plumbing forthe engine smoker system pinch valve epoxied tothe inside cheek cowl Perry pump mounted ply line pumptothevalvetothe smoker levisibie Short piecesof brasetubing make handyto fill thetanks frontend Right control center compact left servo smoker valve omit dont go forthe smoker Supports Gold-N-Rods epoxied firmly place also box receiver wires battery receiver neatly packed foam absorb vibration SOME SAY revolution suppose quite true considering long years have used high-rpm over-square piped two-cycle engines Rev olution may too strong word sure four-cycles stay can get little carried away raves modeling publications challenge getting smoker system work four-cycle enough jump head first try Checking financial status credit rating bank found could purchase OS 40 four-stroker get things started Doc Mathews todays pro lific model designers made interesting statement sequel highly-successful Some decorations make model look realistic dont take much time out add much character plane photos author FINGER HOLE FOR CHOKING OS SHEET 1/1 21 2 LAYERS 1/61 PLY SUPER DOUBLER II -BRAD SHEPHERD H I3/163/8 SPARS RPBA-219 62 YIP 5 GLUE TO FIN 1/150 MED HARD I/QGRAIN ICONTESTS TOCI SIG I/4X2ELEV STOCK 3/32 CROSSORAINs N CROSS GRAIN EDT TOM1/4 OGRAIN CONTEST STOCK 1/16 WE BEING 5 1/16 SHEET ACE 7/8 WHEEL 5/16X1-1/4 TE STOCK l/16X 1/CAP STRIPS LL RIBS LAL3/16BALSA previous effort can often become disaster wit Good Daddy 111111 Rumble 111 III etc Docs experience scaling up down Free Flight models shown him good qualities some times lost scaling process mind going about process putting some lines paper fit 0 S 40 FS mind went layout earlier Doubler designs Doubler has simple structure excellent flying quali ties decided retain good things make changes necessary different model size engine type Having no experience whatever four-cycle model engines relied data presented various publications rpm prop sizes weights wing loadings two-cycle four-cycle comparisons etc playing game calculated guessing instances extremely lucky and/or research paid off Everything turned out just right first flight made thing Ive found need getting adjusted low-decibel putt-putting en gines have correct thinking concerning falling out sky syndrome related sound fourcycle just keeps boring along steady pace doing maneuvers scalelike graceful usually possible two-cycle engine first flight morning rare cool days late summer wind quartering grass-strip flying field engine fired up rpm adjusted tachometer Flying buddy Leon Folse snap few pictures offer some advice running engine previous experience OS 40 FS smoker checked looked OK taxied out strip lined up opened up throttle waiting high-pitched sound model accelerating never came Easing back stick model came unstuck climbed out very smoothly Everything going fine still hadnt gained confidence engines sound smoker apparatus place smoker tank filled Ahnag oil balance point front center gravity CG envelope model handled very nicely smoker kicked some loops rolls performed order check models perform ance rearward CG removed smoker exhaust stub replaced standard exhaust stack smoker tank emptied tubing Perry pump removed resulted CG being center mark plans loops nice slow round figures rearward CG doing consecutive loops engine just keeps chugging away Four-point rolls stall turns spins snap rolls knife-edge flight square loops inverted flight outside loops done during initial flights JOINER oe DIHEDRAL RIlACE 7 BALSA SHEET-SEE SIDE VIEW DIHEDRAL BRACE RIGHT ~11d-/i II TOP SHEET ENDS TOERII CENTER OPRIB-CENTERIII SHEETED AFTER BOLTIIaII HOLES DRILLED1II 2I 421 SHEET TOP CENTER SECTION AFTER I A-III OMIT TINS BII ONLEFTWBIOI1I II I II IIII II __ ____________________________________ II 1 3/IAO3B5RlRS 1/IBTIA CAP STBIPS I/RI SHEET II II I/IN REBIG ALL ElM IR BALSA 1 II II II II II II II II II I/I IBJSC WIHE II II II II II II II II ___________________________ II II1 III A-a-la ---,-III wP PAHEL EPOIT WELL AFTER WHO ASSEGIRT 0/16011/ATE STOCK RIB lA t/8LITE PLY II -1 c3 RIGHT WING SHOWN MASTER RIB PATTERN SOLDER - 2 LAYERS I/IA PLY \ ci II iii FOR CHORBIG DO [I4I DOUBLER hALITE PLY 3/TRIANGLERR SAAB NOT SHOWN 17flNUTS XSAOI PNO P ABUT AWAT 0/Idol LERIINPWI LITEPLTITEP SERNS MOUNT IATOPOHEETPLACE F B AFTER COWL ELAN 121 1/NA PLY" R TRIANGLE II/A OHEET TRIM l/BSEF\ 21 III ENOHE MOUNT1 FWPBALSA JillRHODR TO OUT__ WLOUTLRWRI PTT SEW/N II ICOWLFAHEESiI. 41TTT /PT PERRYPOOPIiW 101-I/iIIRST SOMOICE~I..1/BLITEP DOWEL BALSA F SITRIAIJGLE U 28 Model Aviation Fc1 010 RARALIER APRIASAR3/INPIT ICo //I. ~ II Full-Size Plans Available. See Page 186 pipI pipI 111115 2I Tiip uJ~J IIIIIpP Ii 116-iIa II IIa iiII II p1II IPII ppPpP I3/16 ORBALSALOPTO _IIpp 4~P I DWRAl VERSION VAPITS LAST RN POR VP OLRISPRRT PYLON RACER OR HOTTERAEATICS DB p/LPYE PLY SCRAP TRIAPILE A/P6RALSA ROOT BR M16PEJN 0/tRALSA SPK16 JORIER STAB kh IZER FWP I/l UTE PLY AiZ] 51616 LOCATERS YIP JIG P06161616 ASSENALY SCRAP BALSA 16 PlY APLCRAIPK P406041 OfLOJN CONTEST STOCK S EAO tIP4FZ 1/PLY3 I/a UTE PLYP7 1/8LITE PLY o0 -FFtSELAGE__ __F -oio 004N0TOP Sf00 TUBE ITmI3/NCBRSGRIJNYLSA 16 N FIN --II 1pIL FUSELAGE SIDE VIEW- _____________ __________ _____ 601/B ______________ ________________ ___ OOWEL-OPTIORALWR4Gp p1 _- PATE I'I. --I---PpP pP/BALSA /121P/LITE PP 3/32 CROSS GRAIl ROT FLIER 103/U S/a LITE PIT PiN P64 RWB OLEYT AU EPOSY ydEEN PLY TpIR 019 P6110*45 04 3/OPOE 06101*16 PROJECTED ABRA RElSOJN PlYPPO VETTERN ELEVATOR p/t 191/ ON PSEEOPBROS P4410121 FRI FLAIGE -p/N LITE PPT ROPES OR LPP4 TEROSFSKOpa ALL4PSROSERVEO R144 ELEVATOR 016 IASl ELET STOCK -7 j77 SJG -IA SO 1160 HAM VILE TO FIR RUD ENOEST SI NYL CE 7/I WIEEL SUPER DOUBLER II THE PELADRRNIIB-KO 9P May1987 29 majorcomponents model shown have cut outand readyforassem bly Bolts have installed firewall fuselage sides ready /-in triangle strip longerons /S x 1/4-in stab reinforcement uprights glued place Doublers glued after carefully positioning achieve square fuselage running Zinger 11-6 prop slower steady flight real pleasure Super Doubler II closely resembles earlier Doublers exception front end Also used technique make fuselage shapely did Stephens Akro Laser Sorta PiUs designs provides pleasing form very little effort takes produce Stik Ugly etc fuselage wing MonoKoted fuse lage tail section get doped-finish covering Lightweight silkspan used previous models cover grain Heres authors method securing engine mounting bolts firewall sturdy fuel-proof Anti-twist wire pieces soldered head slots whole business including washers coat ed epoxy System locking slots tabs formers/sides produces fuse lage lightweight strong straight toughen wood Super Doubler II used Sigs Plyspan shiny side out now looks like Plyspan will covering material choice Compared silkspan lighter easier apply after coat uncut dope comes up nice finish sconer 30 Model Aviation Left Tip dihedral jig lain place building board asthewing isassembied Straight reference lines drawn beneath structure may visible magazine reproduction Authors work surface isa piece Celotex laid atopan interiordoor panel lattersupported 2 x 4 frame Right Dihedral joint braced plywood inserted just ahead 3/16-sq trailing edge piece behind spars Left aileron crank mount plate 1/16 plywith curved slot fora linkfrom 90 Goldberg crank 1/16 musicwire pushrod short 90 band slid tip end through rib cutouts crank raised engage bent end underside Right Make initial cut about 1/2 deep cabin section fuselage before applying top sheeting Cabin former F3B place Len i-laces OT polyvinyl sheet have installed saw slots prevent everything being glued together Very useful keep ing fuselage square during assembly 900 angle braces cut scrap balsa Right After entire top has sheeted 3/32 cross-grain balsa make final cut cabin section remove larger fuselage unit Zona Saw good smoke system its fifth servo included model weighs little over 5 lb smoke system omitted 4oz fuel tank used model should weigh about 4 lb 10 oz Recommended control throws shown plans model flies well setup should really consider recommendations starting point adjust throws satisfy flying style should decide clipped-wing version leave ailerons i long move bay smoker unit exhaust stack quite simple make standard K&S tubing piece %2 tubing flared end cut off to receive 0S exhaust pipe nut seat copper gasket smoke chamber made is-in tubing piece i/i6 tubing silver soldered unit can slipped over %2 tubing See picture smoker unit exhaust stub h-in oil feed tubing silver soldered -in tubing just aft /16 tubing unit packed fine steel wool flash off oil passes over hot wool Perry P-20 pump works great installation exit line pump passes through simple open/shut pinch valve crimps silicone tubing Perry pump mounted -in Lite Ply Lite Ply epoxied bottom -in sheet pictures fifth servo operated landing gear switch transmitter actuate pinch valve smoker arrangement course just starting point works reliably now new ideas coming forth others might see some improvements Construction Start making kit parts checking fit may surprised fast model goes gether Select balsa carefully staying away hard heavy stock could substitute straight-grained 3A6 sheet balsa medium weight tail surfaces instead -in contest balsa save bit money used cyanoacrylate glues CyA building Epoxy used plywood parts aliphatic resin used wing sheeting fuselage over 36 long have matched sides balsa sup plier front can short end small piece glued bottom doubler long flat workbench other working space must achieve straight wing An interior door lumberyard excellent surface model building will go over main unusual points construction everyone has own particular method want glue up tail surfaces first go number ways transfer outlines parts onto wood carbon paper under plans measure draw part etc way have found easy accurate use tracing paper paper can see through Place tracing paperover plans trace parts Spray contact adhesive back side traced patterns place patterns appropriate wood cut out parts traced lines Lastly peel off patterns Wing Gut out 22 ribs medium weight quarter-grain balsa Pin bottom spar place over plans place ribs proper location right wing panel omit rib between last bay Pin down rib temporary flange trailing edge Place top spar check ribs standing vertically except root rib Position May1987 31 Throttle pushrod Gold-N-Rod right fuselage side just beyond fusi tank Tubes passing through firewall sealed epoxy Engine fits Hayes iong mount Triangle corners top bottom 1/4-ln sheet former Fl first layer cheek cowl have glued atthis point second layer ply cheeks has glued may able see alIgn ment marks top block Fl 3/32 balsa sides Inside cheek cowls removed before gluIng ply cheeks Y16-sq trailing edge TE piece pin ribs Pin n leading edge LE front ribs Eyeball panel see square hit joints CyA Glue /j6 sheet shear webs place Using long block 220grit paper attached sand -in LE conform shape ribs Glue top /16 LE sheeting place centering edge over middle inboard rib handy Sig mini glue guns apply aliphatic glue rib Put down slow-set CyA along spar LE Place edge sheet over spar roll forward over ribs Aliphatic glue pinsno CyAcan used prefer Slice 3-in-wide sheet quarter-grain /16 balsa two Glue piece over TE location sheet center section yet Glue cap strips place Remove wing panel work surface Slice off jig flanges ribs Pin panel upside down spar Place n leading edge cap under /16 sq pin down cap securely pin wing Glue /16 x 1 -in TE sheet LE sheeting cap strips A6 plywood aileron bellcrank mount Sheet bottom center section Repeat procedure left wing panel remembering omit outer extra rib Install inboard rib shown plans Before assembling wing panels make long straight line workbench Placing panels rear edge bottom spar against line mark dihedral jigs will go under outer rib Pin jigs marks spar locaters proper place panels jig check root ribs fit Block up TE panels center section until level square tip ribs resting firmly jigs Glue root ribs spar stub ends together 5-min epoxy Use Zona Saw trim ribs behind spars order make room dihedral brace Cut away between spars -in sparjoiner Whenthe joiner place epoxy dihedral brace 5-min epoxy Slice away top TE sheeting d Y16-sq also root ribs epoxy rear brace place Using rib lA mark root ribs ahead spars Trim off top half glue lA ribs epoxy FWP place TE stock cut length trialfitted wing panel Hold down panel trailing edge check fit sand necessary glue CyA RWP Lite Ply piece can glued epoxy Mark centerline outboard wing rib glue tips place along triangle reinforcing scraps Sand leading edge sheeting flush -in LE glue -in cap placesanding nice round shape Fuselage necessary use 3 x 36-in wood fuselage start off three sheets straight-grained 3/n x 3-in med ium balsa Slice half Trim edges other two pieces good fit glue sheets together CyA form two 4-in-wide sheets Lay out thrust line piece Draw wing centerline %6 above stab centerline w Continued page 34 32 Model Aviation Ia-in balsa nose piece has glued shaped fuselage corners have rounded whole front end has nicely shaped Careful sanding what takes achieve good results Ply tabs blind nuts attached will receive removable cowl pair 90 scrap balsa triangles hold vertical fin alignment being glued /4In filler piece behind stabilizer has glued make neat tall assembly FOX 40 DELUX ibIy WorIds Finest 40 QC S99 95 / Light welrt z including muff/er spimer Fox 4OBB rht weht kit desns Smooth running 40 Delux smoothest running 40s available Vibration destroys airplanes causes crashes Good cranking compression quick easy hand starts No need buy expensive starter battery charger Choke tilt up tilt down muffler gives mounting options strazht out desn Aluminum spinner included motor other motors have pay extra spinner may fit properly Fox RC motor has check run curb needles set normal operation Fox 40 Delux product 10 years refinement hhly successful concept No undiscovered problems User Friendly term includes lots httle things like curb ad/ustments can reach mounting holes can get fuel line connectors hold tubing also operational characteristics hke willingness start resistance flameouts throttle responsiveness course get superb Fox service 24 Hour shipment parts 3 day rebuild service need cefor price phone call P FOX nrf Pack PO BOX 911 ANDERSON CA 96007 Note Fox Products Are Made U&A Two Piece head construction permits accurately machined combustion chamber glow plug threads much stronger cast material Brass cylinder liner thick hard chrome wearing surface Hard chrome resists wear much better polish chrome nickel used some Fox composite piston desgz utilizes oil absorbing iron band aid upper cylinder lubrication New larger tubular wrist pin locked place roll pin New connecting rod phosphor bronze bushing Oil ho/es both ends 8620 Alloy steel crankshaft carbo-nitrided wear resistant skin Unhke manufacturers grind crankpin before carburizing instead grinding off hard skin Crank has removable prop stud can replaced case accident Large bore front bearing eliminates need step grind crank main associated concentricity leakage problems High spiral carburetor works smoothly gives instant carburetor response Combination thrust washer spinner backplate Ipage lified Trouble free spinner attaching screw Patented Fox oie piece case hih back door hqhter also permits easier rod over crankpin assembly FOR SERVICE OR INFORMATION CALL OR WRITE 5305 TOWSON AVENUE ] FOX MANUFACTURING CO ORT SMITH ARKANSAS 72901 PHONE 501 6461656 R K PRODUCTS 916 365-6700 Ca/I Write Brochure SPECIALIZING IN GIANT SCALE ENGINES AND ACCESSORIES OUR CUSTOM ZENOAN ENGINES FEATURE DUAL OUTLETALUMINUM MUFFLERS DIE-CAST ALUMINUM MOUNTS THROTTLE LINKAGES AND ARE COMPLETELY ASSEMBLED READY TO INSTALL IN YOUR MODEL SMOKE MUFFLERS AND SPRING STARTERS ARE ALSO AVAILABLE AS OPTIONS ZENOAN G-38$11495ZENOAN G-82$21495 CUSTOM 0-3815995CUSTOM G-6224995 CUSTOM 0-38CUSTOM 0-62 w/spring starter16995 pring starter27995 PROPS ZINGERI iSaG-lo$895 18 8-14895 20 n 8-101095 20 n 8-141095 22 8-101195 Add 5250 Postage Handling toeach order COD additional $250 Kits add $750 UPS tiisaIMC now accepted Prices soblect change notice CB / SCALE TAILWHEKL$1395 N0K POWERPLUG250 AMSOIL 100 -I OIL295 WORLD 5-18 FUTUBA2995 G-38 MOUNT1795 0-82 MOUNT1795 CB SPINNERS-30% DON HARRIS SMOKE MUFFLERS5495 B & B SMOKE MUFFLERS2395 WORLD 7 CH NARROW BAND FM RADIO14995 SACHS DOLMAR 37 unfSPtrt8 starter SACHS DOLMAR 52 wlspang Starter MALONEY 100 $34995 38495 12495 ZtN0ER ALUMINUM SPtNNERS 3$1495 3'1595 1795 42095 52395 Sr/u2795 3195 SPRINO STARTER 0-38 & DUADRAS2495 SPRtN0 STARTER 0-623495 34 Model Aviation sides have straight lines except slight curves under over wing location can made n strips bent match straight lines Lay out wing cutout using master rib angling pen marker resulting line /16 wider master Lay out slot stab Cut out both slots fuselage outline Use first side master cuffing other side -in triangle n strips uprights glued place CyA doublers glued contact cement CyA applied around edges Note picture completed sides before being assembled box Pin down sides over top view former F-4 Draw sides together tail post Make sure sides glue Insert former PA doub lers Using scrap pieces cut 900 angle jig fuselage sides glue P-4 place Place piece -in scrap former location F-3 Draw sides together glue F-3 place using 90 angles assure squareness Note picture fuse lage being built Lay out mounting holes fire wall P-2 suit mount will use used Hayes 40 long mount method shown installing engine mount has proven models over years fuel-proof after engine compart ment has epoxied Drill mounting holes run 6-32 bolts washers Temporarily install mount front firewall engage snug up nuts 6-32 bolts Short pieces music wire soldered slots bolt heads followed liberal application epoxy over heads wire Note picture back side firewall before installed Spread apart fuselage enough install firewall slots doublers glue liberal amount epoxy Carefully glue P3B F4B -in top triangle enough glue hold place Zona Saw make partial cut fuselage sides between formers P3 F3B P4 F4B Note picture saw cut being made make complete cut time go about halfway install some poly sheet slots top sheet can glued gluing whole business together top sheeting has glued finish cut remove cabin section Pimsh gluing formers F3B P4B sides cabin section Sheet bottom epoxy LGP place Install throttle pushrod check smooth operation engine place Note picture front end assembly before installation top block Glue /i ply tank floor being careful bind throttle pushrod 6-oz tank shown plans pictures can replaced 4-oz learned initial flights 4Continued page 36 36 Model Aviation oz tank should give flights 10 12 minutes Install fuel tank also smoker tank latter desired method shown pictures slot cut top firewall fuel lines piece balsa glued over lines cavity filled epoxy smoker tank required hole drilled firewall note picture An application epoxy completely fuelproofed front end Place foam around tanks careful bind throttle rod 34-in triangle pieces med -in top bottom sheets glued front end squared up sanding block Mark centerlines sheets also former F 1 note pictures Glue Fl place Mark position 6 x -in cowl flange strips fuselage sides glue place Glue Cl formers cut 4 ply cowl fit against formers flange strips good fit obtained coat side 1-hr epoxy install formers strips pinning place until cured used CyA install second layer coat epoxy just suitable Rough-cut -in balsa nose piece Glue Fl cabin section can pinned back place round corners being sanded front end should sanded final shape shown picture removable section cowl laid out pencil cut off Zona Saw Install ply tabs dowels blind nuts hold cowl place Glue maple wing hold-down blocks going use bolt method wing attachment FWB RWB epoxyglue joints Disregard step going use rubberbands hold wing Instead put -in dowels shown side view Lite Ply rear plate wing hold-down glued first maple block glued Position wing saddle fuselage Get square Pin place drill holes through maple blocks screws Remove wing tap threads Screw wing place slide stabilizer its slot Check stab squareness fuselage wing satisfied glue stab place Attach elevators hinges ply sub-fm Klett aileron fitting /32 tubing V16 wire glued slot ply flange vertical fin check-fitted epoxied place aid scrap 900 angles hold Glue scrap piece balsa slot behind elevator fuselage Wheel pants dress up Super Doubler II make look like miniature copy full-size aircraft difficult make foam used shape shaped foam covered fiberglass cloth epoxy foam dugout remove wheel pants initial flights because field needed Continued page 146 -I — 5f5 FULL LINE METAL SPECIALISTS SPECILISTS IN CUSTOM COX TEE DEE & REED ENGINES 020S 049S 05 IS & 09S ALL CUSTOM & STOCK PARTS VAILABLE INDIVIDUALLY MANY NEW PARTS FOR OLD COX ENGINES IF ITS COX ENGINE CALL US! FREE FUGHT K&B CUSTOMIZED ENGINES ALSO COMPLETE LINE OF U/C & R/C RACING PARTS SOLID UNES RACING WHEELS QUICK FILLS AND MORE.. WE ALSO STOCK KLOTZ OIL BROAD RANGE OF GLOW PLUGS SPECIAL FUEL TUBING & HARD-TO-FIND HARDWARE ESPECIALLY 2-56 & 3-48 SIZES CARBON FIBER COILS PLUGS CONDENSERS SILK TIMERS TRANSISTOR IGNITION SYSTEMS l/2A TEXACO ENGINES EVERYTHING YOU NEED FOR OLD TIMER INCLUDING REPLICA OR WiCK ENGINES NE WI! 1/2A PLAYBOY SR FOR l/2A TEXACO R/C FF ELECTRIC OR SPORT KIT $2995 Safety/Preston Continued page 22 ground After couple minutes engine nmning perfectly throttled back ofasuddenthe Heicopterenginestartedtorev up seconds hovering nicely boom deviation Moments later started climbing What first flight No need trim no need touch control sticks no need transmitter eithet What happened turned out battery voltage dropped below safe level fail-safe devices took control As result Helicopter became just point sky After engine stopped started coming down Hi roho must very proud because after autorotation Helicopter landed minor damage question after What reason fail-safe switches devices since dont know time attitude model really going use would like know readers have reported anything favor device really want opinion switch secondary frequency during emer gency because purpose lose control rather have control surfaces model move preset positions am familiar radio system involved seems fail-safe device throttle reversed drop battery voltage level unsafe should have closed throttle rather opened However issue question Antonis has asked readers What wants know advantage having con trol surfaces go preset position neutral case flying controls event trans mitter signal lost whatever reason Cer tainly isnt going help Aerobatic flier save model control surfaces suddenly go neutral middle complex maneuver other hand Im favor having engine go low throttle upon loss transmitter signal receiver battery voltage drops below safe level readers wish express opinions Id welcome letters Have safe month John Preston 2812 Northampton Sr N W Washington DC 20015 responding advertisers mention thatyou read aboutthem ModelAviation Doubler/Shepherd Continued page 36 be mowed grass little too tall lettering model done dry transfers art supply store coat clear Sig Skybrite applied over protection sponsor decals canopy model auto decal sheets pilot head started out Williams Bros figure back side goggles painted black enamel give appearance sunglasses am pleased way project has turned out easy build flies very nicely will either clip current wing build another reduced span will also trying other engines model ing event becoming quite popular local clubs 500 sport racer stock Royal 25s HR 25s clippedwing version should fit right expanding Pylon Racing event model qsite change pace decide build hope will have fun enjoy Remember fourcycles dont scream just putt-putt Radio Technique/Myers Continued page 39 FCC time will able tell whether system contemplating has certificated according AMA Guidelines Right now have nothing Resource managemenl Noninterfrring RC channel arrangements think Dennis Tier ney has best solution See Whistle Blows Dont Fly page 93 et seq Model Aviation March 1987 urge Dennis con tinue working design until includes 80 RC channels scheduled 1991 well seven old channels 27 MHz 50 MHz 53 MHz channels Besides should reduce wiring double-sided PC board will put him position sell useful gimmick RC airplane boat car clubs over United States Canada have feeling once people see easily Dennis gadget works organization will want Its sort self-policing transmitter impound manager Go Dennis 146 Model Aviation OUR REV-UP INVENTORY AVERAGES 12000 PROPSIII SEE OUR AD LAST MONTH FOR LIST OF PROPS AND PRICES ding iiThg ring. AJ iNTERCEPTOR4e9S compiete U-build Kit photos easy instructions NOTEPLE*SEAOO 5300 O P00*0f S DANOCING nESt 00E URUILD OES ADO TEN PERCENT OP PEICE POD EACA ADbrtIONAL ~CRAFT COMPANY RO Box 68132 Portland OR 97268 1000/0 Satisfaction Ouaraneea Money Back SEND 450 per 5/8 ID Coupler or550per3/4ID DANA AEROSPACE CORP 1110 E 5th St rior WI 54880 OLD TIMER SUPPLIES ORDER DY MAIL OR PHONE 714 830-5162 SOAR V NO COD VISA MASTERCARD WELCOME DEALER INQUIRIES INVITED ALL PRICES POSTPAID MINIMUM ORDER *1000 FOR INSURANCE ADD $100 ORDERS SHIPPED WITHIN 24 HAS EAI R~ifl#MT0 Aflfl * TA V

NO OCR TEXT NO OCR TEXT isa certain beauty uncovered framework guess lithe kind bug bit us years ago says author/designer Shepherd im sure glad no cure Things see vent/drain hole bottom sheet firewall second smoke cham ber screwed place four fiat-head screws holding landing gear fiush sheeting ciean cutouts wheei pants front end cowi ieftwe seethe enginesexhaust stub Perry pump place Notethethrottie pushrod witn bend arm slid over rod engine mount rotated position mount bolts allows easy removal installation engine maintenance right smoke chamber place Silicone feed tube exits pump goes through pinch valve before entering smoker Smoker slipped over short stub end i bolted engine via exhaust nut Left Plumbing forthe engine smoker system pinch valve epoxied tothe inside cheek cowl Perry pump mounted ply line pumptothevalvetothe smoker levisibie Short piecesof brasetubing make handyto fill thetanks frontend Right control center compact left servo smoker valve omit dont go forthe smoker Supports Gold-N-Rods epoxied firmly place also box receiver wires battery receiver neatly packed foam absorb vibration SOME SAY revolution suppose quite true considering long years have used high-rpm over-square piped two-cycle engines Rev olution may too strong word sure four-cycles stay can get little carried away raves modeling publications challenge getting smoker system work four-cycle enough jump head first try Checking financial status credit rating bank found could purchase OS 40 four-stroker get things started Doc Mathews todays pro lific model designers made interesting statement sequel highly-successful Some decorations make model look realistic dont take much time out add much character plane photos author FINGER HOLE FOR CHOKING OS SHEET 1/1 21 2 LAYERS 1/61 PLY SUPER DOUBLER II -BRAD SHEPHERD H I3/163/8 SPARS RPBA-219 62 YIP 5 GLUE TO FIN 1/150 MED HARD I/QGRAIN ICONTESTS TOCI SIG I/4X2ELEV STOCK 3/32 CROSSORAINs N CROSS GRAIN EDT TOM1/4 OGRAIN CONTEST STOCK 1/16 WE BEING 5 1/16 SHEET ACE 7/8 WHEEL 5/16X1-1/4 TE STOCK l/16X 1/CAP STRIPS LL RIBS LAL3/16BALSA previous effort can often become disaster wit Good Daddy 111111 Rumble 111 III etc Docs experience scaling up down Free Flight models shown him good qualities some times lost scaling process mind going about process putting some lines paper fit 0 S 40 FS mind went layout earlier Doubler designs Doubler has simple structure excellent flying quali ties decided retain good things make changes necessary different model size engine type Having no experience whatever four-cycle model engines relied data presented various publications rpm prop sizes weights wing loadings two-cycle four-cycle comparisons etc playing game calculated guessing instances extremely lucky and/or research paid off Everything turned out just right first flight made thing Ive found need getting adjusted low-decibel putt-putting en gines have correct thinking concerning falling out sky syndrome related sound fourcycle just keeps boring along steady pace doing maneuvers scalelike graceful usually possible two-cycle engine first flight morning rare cool days late summer wind quartering grass-strip flying field engine fired up rpm adjusted tachometer Flying buddy Leon Folse snap few pictures offer some advice running engine previous experience OS 40 FS smoker checked looked OK taxied out strip lined up opened up throttle waiting high-pitched sound model accelerating never came Easing back stick model came unstuck climbed out very smoothly Everything going fine still hadnt gained confidence engines sound smoker apparatus place smoker tank filled Ahnag oil balance point front center gravity CG envelope model handled very nicely smoker kicked some loops rolls performed order check models perform ance rearward CG removed smoker exhaust stub replaced standard exhaust stack smoker tank emptied tubing Perry pump removed resulted CG being center mark plans loops nice slow round figures rearward CG doing consecutive loops engine just keeps chugging away Four-point rolls stall turns spins snap rolls knife-edge flight square loops inverted flight outside loops done during initial flights JOINER oe DIHEDRAL RIlACE 7 BALSA SHEET-SEE SIDE VIEW DIHEDRAL BRACE RIGHT ~11d-/i II TOP SHEET ENDS TOERII CENTER OPRIB-CENTERIII SHEETED AFTER BOLTIIaII HOLES DRILLED1II 2I 421 SHEET TOP CENTER SECTION AFTER I A-III OMIT TINS BII ONLEFTWBIOI1I II I II IIII II __ ____________________________________ II 1 3/IAO3B5RlRS 1/IBTIA CAP STBIPS I/RI SHEET II II I/IN REBIG ALL ElM IR BALSA 1 II II II II II II II II II I/I IBJSC WIHE II II II II II II II II ___________________________ II II1 III A-a-la ---,-III wP PAHEL EPOIT WELL AFTER WHO ASSEGIRT 0/16011/ATE STOCK RIB lA t/8LITE PLY II -1 c3 RIGHT WING SHOWN MASTER RIB PATTERN SOLDER - 2 LAYERS I/IA PLY \ ci II iii FOR CHORBIG DO [I4I DOUBLER hALITE PLY 3/TRIANGLERR SAAB NOT SHOWN 17flNUTS XSAOI PNO P ABUT AWAT 0/Idol LERIINPWI LITEPLTITEP SERNS MOUNT IATOPOHEETPLACE F B AFTER COWL ELAN 121 1/NA PLY" R TRIANGLE II/A OHEET TRIM l/BSEF\ 21 III ENOHE MOUNT1 FWPBALSA JillRHODR TO OUT__ WLOUTLRWRI PTT SEW/N II ICOWLFAHEESiI. 41TTT /PT PERRYPOOPIiW 101-I/iIIRST SOMOICE~I..1/BLITEP DOWEL BALSA F SITRIAIJGLE U 28 Model Aviation Fc1 010 RARALIER APRIASAR3/INPIT ICo //I. ~ II Full-Size Plans Available. See Page 186 pipI pipI 111115 2I Tiip uJ~J IIIIIpP Ii 116-iIa II IIa iiII II p1II IPII ppPpP I3/16 ORBALSALOPTO _IIpp 4~P I DWRAl VERSION VAPITS LAST RN POR VP OLRISPRRT PYLON RACER OR HOTTERAEATICS DB p/LPYE PLY SCRAP TRIAPILE A/P6RALSA ROOT BR M16PEJN 0/tRALSA SPK16 JORIER STAB kh IZER FWP I/l UTE PLY AiZ] 51616 LOCATERS YIP JIG P06161616 ASSENALY SCRAP BALSA 16 PlY APLCRAIPK P406041 OfLOJN CONTEST STOCK S EAO tIP4FZ 1/PLY3 I/a UTE PLYP7 1/8LITE PLY o0 -FFtSELAGE__ __F -oio 004N0TOP Sf00 TUBE ITmI3/NCBRSGRIJNYLSA 16 N FIN --II 1pIL FUSELAGE SIDE VIEW- _____________ __________ _____ 601/B ______________ ________________ ___ OOWEL-OPTIORALWR4Gp p1 _- PATE I'I. --I---PpP pP/BALSA /121P/LITE PP 3/32 CROSS GRAIl ROT FLIER 103/U S/a LITE PIT PiN P64 RWB OLEYT AU EPOSY ydEEN PLY TpIR 019 P6110*45 04 3/OPOE 06101*16 PROJECTED ABRA RElSOJN PlYPPO VETTERN ELEVATOR p/t 191/ ON PSEEOPBROS P4410121 FRI FLAIGE -p/N LITE PPT ROPES OR LPP4 TEROSFSKOpa ALL4PSROSERVEO R144 ELEVATOR 016 IASl ELET STOCK -7 j77 SJG -IA SO 1160 HAM VILE TO FIR RUD ENOEST SI NYL CE 7/I WIEEL SUPER DOUBLER II THE PELADRRNIIB-KO 9P May1987 29 majorcomponents model shown have cut outand readyforassem bly Bolts have installed firewall fuselage sides ready /-in triangle strip longerons /S x 1/4-in stab reinforcement uprights glued place Doublers glued after carefully positioning achieve square fuselage running Zinger 11-6 prop slower steady flight real pleasure Super Doubler II closely resembles earlier Doublers exception front end Also used technique make fuselage shapely did Stephens Akro Laser Sorta PiUs designs provides pleasing form very little effort takes produce Stik Ugly etc fuselage wing MonoKoted fuse lage tail section get doped-finish covering Lightweight silkspan used previous models cover grain Heres authors method securing engine mounting bolts firewall sturdy fuel-proof Anti-twist wire pieces soldered head slots whole business including washers coat ed epoxy System locking slots tabs formers/sides produces fuse lage lightweight strong straight toughen wood Super Doubler II used Sigs Plyspan shiny side out now looks like Plyspan will covering material choice Compared silkspan lighter easier apply after coat uncut dope comes up nice finish sconer 30 Model Aviation Left Tip dihedral jig lain place building board asthewing isassembied Straight reference lines drawn beneath structure may visible magazine reproduction Authors work surface isa piece Celotex laid atopan interiordoor panel lattersupported 2 x 4 frame Right Dihedral joint braced plywood inserted just ahead 3/16-sq trailing edge piece behind spars Left aileron crank mount plate 1/16 plywith curved slot fora linkfrom 90 Goldberg crank 1/16 musicwire pushrod short 90 band slid tip end through rib cutouts crank raised engage bent end underside Right Make initial cut about 1/2 deep cabin section fuselage before applying top sheeting Cabin former F3B place Len i-laces OT polyvinyl sheet have installed saw slots prevent everything being glued together Very useful keep ing fuselage square during assembly 900 angle braces cut scrap balsa Right After entire top has sheeted 3/32 cross-grain balsa make final cut cabin section remove larger fuselage unit Zona Saw good smoke system its fifth servo included model weighs little over 5 lb smoke system omitted 4oz fuel tank used model should weigh about 4 lb 10 oz Recommended control throws shown plans model flies well setup should really consider recommendations starting point adjust throws satisfy flying style should decide clipped-wing version leave ailerons i long move bay smoker unit exhaust stack quite simple make standard K&S tubing piece %2 tubing flared end cut off to receive 0S exhaust pipe nut seat copper gasket smoke chamber made is-in tubing piece i/i6 tubing silver soldered unit can slipped over %2 tubing See picture smoker unit exhaust stub h-in oil feed tubing silver soldered -in tubing just aft /16 tubing unit packed fine steel wool flash off oil passes over hot wool Perry P-20 pump works great installation exit line pump passes through simple open/shut pinch valve crimps silicone tubing Perry pump mounted -in Lite Ply Lite Ply epoxied bottom -in sheet pictures fifth servo operated landing gear switch transmitter actuate pinch valve smoker arrangement course just starting point works reliably now new ideas coming forth others might see some improvements Construction Start making kit parts checking fit may surprised fast model goes gether Select balsa carefully staying away hard heavy stock could substitute straight-grained 3A6 sheet balsa medium weight tail surfaces instead -in contest balsa save bit money used cyanoacrylate glues CyA building Epoxy used plywood parts aliphatic resin used wing sheeting fuselage over 36 long have matched sides balsa sup plier front can short end small piece glued bottom doubler long flat workbench other working space must achieve straight wing An interior door lumberyard excellent surface model building will go over main unusual points construction everyone has own particular method want glue up tail surfaces first go number ways transfer outlines parts onto wood carbon paper under plans measure draw part etc way have found easy accurate use tracing paper paper can see through Place tracing paperover plans trace parts Spray contact adhesive back side traced patterns place patterns appropriate wood cut out parts traced lines Lastly peel off patterns Wing Gut out 22 ribs medium weight quarter-grain balsa Pin bottom spar place over plans place ribs proper location right wing panel omit rib between last bay Pin down rib temporary flange trailing edge Place top spar check ribs standing vertically except root rib Position May1987 31 Throttle pushrod Gold-N-Rod right fuselage side just beyond fusi tank Tubes passing through firewall sealed epoxy Engine fits Hayes iong mount Triangle corners top bottom 1/4-ln sheet former Fl first layer cheek cowl have glued atthis point second layer ply cheeks has glued may able see alIgn ment marks top block Fl 3/32 balsa sides Inside cheek cowls removed before gluIng ply cheeks Y16-sq trailing edge TE piece pin ribs Pin n leading edge LE front ribs Eyeball panel see square hit joints CyA Glue /j6 sheet shear webs place Using long block 220grit paper attached sand -in LE conform shape ribs Glue top /16 LE sheeting place centering edge over middle inboard rib handy Sig mini glue guns apply aliphatic glue rib Put down slow-set CyA along spar LE Place edge sheet over spar roll forward over ribs Aliphatic glue pinsno CyAcan used prefer Slice 3-in-wide sheet quarter-grain /16 balsa two Glue piece over TE location sheet center section yet Glue cap strips place Remove wing panel work surface Slice off jig flanges ribs Pin panel upside down spar Place n leading edge cap under /16 sq pin down cap securely pin wing Glue /16 x 1 -in TE sheet LE sheeting cap strips A6 plywood aileron bellcrank mount Sheet bottom center section Repeat procedure left wing panel remembering omit outer extra rib Install inboard rib shown plans Before assembling wing panels make long straight line workbench Placing panels rear edge bottom spar against line mark dihedral jigs will go under outer rib Pin jigs marks spar locaters proper place panels jig check root ribs fit Block up TE panels center section until level square tip ribs resting firmly jigs Glue root ribs spar stub ends together 5-min epoxy Use Zona Saw trim ribs behind spars order make room dihedral brace Cut away between spars -in sparjoiner Whenthe joiner place epoxy dihedral brace 5-min epoxy Slice away top TE sheeting d Y16-sq also root ribs epoxy rear brace place Using rib lA mark root ribs ahead spars Trim off top half glue lA ribs epoxy FWP place TE stock cut length trialfitted wing panel Hold down panel trailing edge check fit sand necessary glue CyA RWP Lite Ply piece can glued epoxy Mark centerline outboard wing rib glue tips place along triangle reinforcing scraps Sand leading edge sheeting flush -in LE glue -in cap placesanding nice round shape Fuselage necessary use 3 x 36-in wood fuselage start off three sheets straight-grained 3/n x 3-in med ium balsa Slice half Trim edges other two pieces good fit glue sheets together CyA form two 4-in-wide sheets Lay out thrust line piece Draw wing centerline %6 above stab centerline w Continued page 34 32 Model Aviation Ia-in balsa nose piece has glued shaped fuselage corners have rounded whole front end has nicely shaped Careful sanding what takes achieve good results Ply tabs blind nuts attached will receive removable cowl pair 90 scrap balsa triangles hold vertical fin alignment being glued /4In filler piece behind stabilizer has glued make neat tall assembly FOX 40 DELUX ibIy WorIds Finest 40 QC S99 95 / Light welrt z including muff/er spimer Fox 4OBB rht weht kit desns Smooth running 40 Delux smoothest running 40s available Vibration destroys airplanes causes crashes Good cranking compression quick easy hand starts No need buy expensive starter battery charger Choke tilt up tilt down muffler gives mounting options strazht out desn Aluminum spinner included motor other motors have pay extra spinner may fit properly Fox RC motor has check run curb needles set normal operation Fox 40 Delux product 10 years refinement hhly successful concept No undiscovered problems User Friendly term includes lots httle things like curb ad/ustments can reach mounting holes can get fuel line connectors hold tubing also operational characteristics hke willingness start resistance flameouts throttle responsiveness course get superb Fox service 24 Hour shipment parts 3 day rebuild service need cefor price phone call P FOX nrf Pack PO BOX 911 ANDERSON CA 96007 Note Fox Products Are Made U&A Two Piece head construction permits accurately machined combustion chamber glow plug threads much stronger cast material Brass cylinder liner thick hard chrome wearing surface Hard chrome resists wear much better polish chrome nickel used some Fox composite piston desgz utilizes oil absorbing iron band aid upper cylinder lubrication New larger tubular wrist pin locked place roll pin New connecting rod phosphor bronze bushing Oil ho/es both ends 8620 Alloy steel crankshaft carbo-nitrided wear resistant skin Unhke manufacturers grind crankpin before carburizing instead grinding off hard skin Crank has removable prop stud can replaced case accident Large bore front bearing eliminates need step grind crank main associated concentricity leakage problems High spiral carburetor works smoothly gives instant carburetor response Combination thrust washer spinner backplate Ipage lified Trouble free spinner attaching screw Patented Fox oie piece case hih back door hqhter also permits easier rod over crankpin assembly FOR SERVICE OR INFORMATION CALL OR WRITE 5305 TOWSON AVENUE ] FOX MANUFACTURING CO ORT SMITH ARKANSAS 72901 PHONE 501 6461656 R K PRODUCTS 916 365-6700 Ca/I Write Brochure SPECIALIZING IN GIANT SCALE ENGINES AND ACCESSORIES OUR CUSTOM ZENOAN ENGINES FEATURE DUAL OUTLETALUMINUM MUFFLERS DIE-CAST ALUMINUM MOUNTS THROTTLE LINKAGES AND ARE COMPLETELY ASSEMBLED READY TO INSTALL IN YOUR MODEL SMOKE MUFFLERS AND SPRING STARTERS ARE ALSO AVAILABLE AS OPTIONS ZENOAN G-38$11495ZENOAN G-82$21495 CUSTOM 0-3815995CUSTOM G-6224995 CUSTOM 0-38CUSTOM 0-62 w/spring starter16995 pring starter27995 PROPS ZINGERI iSaG-lo$895 18 8-14895 20 n 8-101095 20 n 8-141095 22 8-101195 Add 5250 Postage Handling toeach order COD additional $250 Kits add $750 UPS tiisaIMC now accepted Prices soblect change notice CB / SCALE TAILWHEKL$1395 N0K POWERPLUG250 AMSOIL 100 -I OIL295 WORLD 5-18 FUTUBA2995 G-38 MOUNT1795 0-82 MOUNT1795 CB SPINNERS-30% DON HARRIS SMOKE MUFFLERS5495 B & B SMOKE MUFFLERS2395 WORLD 7 CH NARROW BAND FM RADIO14995 SACHS DOLMAR 37 unfSPtrt8 starter SACHS DOLMAR 52 wlspang Starter MALONEY 100 $34995 38495 12495 ZtN0ER ALUMINUM SPtNNERS 3$1495 3'1595 1795 42095 52395 Sr/u2795 3195 SPRINO STARTER 0-38 & DUADRAS2495 SPRtN0 STARTER 0-623495 34 Model Aviation sides have straight lines except slight curves under over wing location can made n strips bent match straight lines Lay out wing cutout using master rib angling pen marker resulting line /16 wider master Lay out slot stab Cut out both slots fuselage outline Use first side master cuffing other side -in triangle n strips uprights glued place CyA doublers glued contact cement CyA applied around edges Note picture completed sides before being assembled box Pin down sides over top view former F-4 Draw sides together tail post Make sure sides glue Insert former PA doub lers Using scrap pieces cut 900 angle jig fuselage sides glue P-4 place Place piece -in scrap former location F-3 Draw sides together glue F-3 place using 90 angles assure squareness Note picture fuse lage being built Lay out mounting holes fire wall P-2 suit mount will use used Hayes 40 long mount method shown installing engine mount has proven models over years fuel-proof after engine compart ment has epoxied Drill mounting holes run 6-32 bolts washers Temporarily install mount front firewall engage snug up nuts 6-32 bolts Short pieces music wire soldered slots bolt heads followed liberal application epoxy over heads wire Note picture back side firewall before installed Spread apart fuselage enough install firewall slots doublers glue liberal amount epoxy Carefully glue P3B F4B -in top triangle enough glue hold place Zona Saw make partial cut fuselage sides between formers P3 F3B P4 F4B Note picture saw cut being made make complete cut time go about halfway install some poly sheet slots top sheet can glued gluing whole business together top sheeting has glued finish cut remove cabin section Pimsh gluing formers F3B P4B sides cabin section Sheet bottom epoxy LGP place Install throttle pushrod check smooth operation engine place Note picture front end assembly before installation top block Glue /i ply tank floor being careful bind throttle pushrod 6-oz tank shown plans pictures can replaced 4-oz learned initial flights 4Continued page 36 36 Model Aviation oz tank should give flights 10 12 minutes Install fuel tank also smoker tank latter desired method shown pictures slot cut top firewall fuel lines piece balsa glued over lines cavity filled epoxy smoker tank required hole drilled firewall note picture An application epoxy completely fuelproofed front end Place foam around tanks careful bind throttle rod 34-in triangle pieces med -in top bottom sheets glued front end squared up sanding block Mark centerlines sheets also former F 1 note pictures Glue Fl place Mark position 6 x -in cowl flange strips fuselage sides glue place Glue Cl formers cut 4 ply cowl fit against formers flange strips good fit obtained coat side 1-hr epoxy install formers strips pinning place until cured used CyA install second layer coat epoxy just suitable Rough-cut -in balsa nose piece Glue Fl cabin section can pinned back place round corners being sanded front end should sanded final shape shown picture removable section cowl laid out pencil cut off Zona Saw Install ply tabs dowels blind nuts hold cowl place Glue maple wing hold-down blocks going use bolt method wing attachment FWB RWB epoxyglue joints Disregard step going use rubberbands hold wing Instead put -in dowels shown side view Lite Ply rear plate wing hold-down glued first maple block glued Position wing saddle fuselage Get square Pin place drill holes through maple blocks screws Remove wing tap threads Screw wing place slide stabilizer its slot Check stab squareness fuselage wing satisfied glue stab place Attach elevators hinges ply sub-fm Klett aileron fitting /32 tubing V16 wire glued slot ply flange vertical fin check-fitted epoxied place aid scrap 900 angles hold Glue scrap piece balsa slot behind elevator fuselage Wheel pants dress up Super Doubler II make look like miniature copy full-size aircraft difficult make foam used shape shaped foam covered fiberglass cloth epoxy foam dugout remove wheel pants initial flights because field needed Continued page 146 -I — 5f5 FULL LINE METAL SPECIALISTS SPECILISTS IN CUSTOM COX TEE DEE & REED ENGINES 020S 049S 05 IS & 09S ALL CUSTOM & STOCK PARTS VAILABLE INDIVIDUALLY MANY NEW PARTS FOR OLD COX ENGINES IF ITS COX ENGINE CALL US! FREE FUGHT K&B CUSTOMIZED ENGINES ALSO COMPLETE LINE OF U/C & R/C RACING PARTS SOLID UNES RACING WHEELS QUICK FILLS AND MORE.. WE ALSO STOCK KLOTZ OIL BROAD RANGE OF GLOW PLUGS SPECIAL FUEL TUBING & HARD-TO-FIND HARDWARE ESPECIALLY 2-56 & 3-48 SIZES CARBON FIBER COILS PLUGS CONDENSERS SILK TIMERS TRANSISTOR IGNITION SYSTEMS l/2A TEXACO ENGINES EVERYTHING YOU NEED FOR OLD TIMER INCLUDING REPLICA OR WiCK ENGINES NE WI! 1/2A PLAYBOY SR FOR l/2A TEXACO R/C FF ELECTRIC OR SPORT KIT $2995 Safety/Preston Continued page 22 ground After couple minutes engine nmning perfectly throttled back ofasuddenthe Heicopterenginestartedtorev up seconds hovering nicely boom deviation Moments later started climbing What first flight No need trim no need touch control sticks no need transmitter eithet What happened turned out battery voltage dropped below safe level fail-safe devices took control As result Helicopter became just point sky After engine stopped started coming down Hi roho must very proud because after autorotation Helicopter landed minor damage question after What reason fail-safe switches devices since dont know time attitude model really going use would like know readers have reported anything favor device really want opinion switch secondary frequency during emer gency because purpose lose control rather have control surfaces model move preset positions am familiar radio system involved seems fail-safe device throttle reversed drop battery voltage level unsafe should have closed throttle rather opened However issue question Antonis has asked readers What wants know advantage having con trol surfaces go preset position neutral case flying controls event trans mitter signal lost whatever reason Cer tainly isnt going help Aerobatic flier save model control surfaces suddenly go neutral middle complex maneuver other hand Im favor having engine go low throttle upon loss transmitter signal receiver battery voltage drops below safe level readers wish express opinions Id welcome letters Have safe month John Preston 2812 Northampton Sr N W Washington DC 20015 responding advertisers mention thatyou read aboutthem ModelAviation Doubler/Shepherd Continued page 36 be mowed grass little too tall lettering model done dry transfers art supply store coat clear Sig Skybrite applied over protection sponsor decals canopy model auto decal sheets pilot head started out Williams Bros figure back side goggles painted black enamel give appearance sunglasses am pleased way project has turned out easy build flies very nicely will either clip current wing build another reduced span will also trying other engines model ing event becoming quite popular local clubs 500 sport racer stock Royal 25s HR 25s clippedwing version should fit right expanding Pylon Racing event model qsite change pace decide build hope will have fun enjoy Remember fourcycles dont scream just putt-putt Radio Technique/Myers Continued page 39 FCC time will able tell whether system contemplating has certificated according AMA Guidelines Right now have nothing Resource managemenl Noninterfrring RC channel arrangements think Dennis Tier ney has best solution See Whistle Blows Dont Fly page 93 et seq Model Aviation March 1987 urge Dennis con tinue working design until includes 80 RC channels scheduled 1991 well seven old channels 27 MHz 50 MHz 53 MHz channels Besides should reduce wiring double-sided PC board will put him position sell useful gimmick RC airplane boat car clubs over United States Canada have feeling once people see easily Dennis gadget works organization will want Its sort self-policing transmitter impound manager Go Dennis 146 Model Aviation OUR REV-UP INVENTORY AVERAGES 12000 PROPSIII SEE OUR AD LAST MONTH FOR LIST OF PROPS AND PRICES ding iiThg ring. AJ iNTERCEPTOR4e9S compiete U-build Kit photos easy instructions NOTEPLE*SEAOO 5300 O P00*0f S DANOCING nESt 00E URUILD OES ADO TEN PERCENT OP PEICE POD EACA ADbrtIONAL ~CRAFT COMPANY RO Box 68132 Portland OR 97268 1000/0 Satisfaction Ouaraneea Money Back SEND 450 per 5/8 ID Coupler or550per3/4ID DANA AEROSPACE CORP 1110 E 5th St rior WI 54880 OLD TIMER SUPPLIES ORDER DY MAIL OR PHONE 714 830-5162 SOAR V NO COD VISA MASTERCARD WELCOME DEALER INQUIRIES INVITED ALL PRICES POSTPAID MINIMUM ORDER *1000 FOR INSURANCE ADD $100 ORDERS SHIPPED WITHIN 24 HAS EAI R~ifl#MT0 Aflfl * TA V

NO OCR TEXT NO OCR TEXT isa certain beauty uncovered framework guess lithe kind bug bit us years ago says author/designer Shepherd im sure glad no cure Things see vent/drain hole bottom sheet firewall second smoke cham ber screwed place four fiat-head screws holding landing gear fiush sheeting ciean cutouts wheei pants front end cowi ieftwe seethe enginesexhaust stub Perry pump place Notethethrottie pushrod witn bend arm slid over rod engine mount rotated position mount bolts allows easy removal installation engine maintenance right smoke chamber place Silicone feed tube exits pump goes through pinch valve before entering smoker Smoker slipped over short stub end i bolted engine via exhaust nut Left Plumbing forthe engine smoker system pinch valve epoxied tothe inside cheek cowl Perry pump mounted ply line pumptothevalvetothe smoker levisibie Short piecesof brasetubing make handyto fill thetanks frontend Right control center compact left servo smoker valve omit dont go forthe smoker Supports Gold-N-Rods epoxied firmly place also box receiver wires battery receiver neatly packed foam absorb vibration SOME SAY revolution suppose quite true considering long years have used high-rpm over-square piped two-cycle engines Rev olution may too strong word sure four-cycles stay can get little carried away raves modeling publications challenge getting smoker system work four-cycle enough jump head first try Checking financial status credit rating bank found could purchase OS 40 four-stroker get things started Doc Mathews todays pro lific model designers made interesting statement sequel highly-successful Some decorations make model look realistic dont take much time out add much character plane photos author FINGER HOLE FOR CHOKING OS SHEET 1/1 21 2 LAYERS 1/61 PLY SUPER DOUBLER II -BRAD SHEPHERD H I3/163/8 SPARS RPBA-219 62 YIP 5 GLUE TO FIN 1/150 MED HARD I/QGRAIN ICONTESTS TOCI SIG I/4X2ELEV STOCK 3/32 CROSSORAINs N CROSS GRAIN EDT TOM1/4 OGRAIN CONTEST STOCK 1/16 WE BEING 5 1/16 SHEET ACE 7/8 WHEEL 5/16X1-1/4 TE STOCK l/16X 1/CAP STRIPS LL RIBS LAL3/16BALSA previous effort can often become disaster wit Good Daddy 111111 Rumble 111 III etc Docs experience scaling up down Free Flight models shown him good qualities some times lost scaling process mind going about process putting some lines paper fit 0 S 40 FS mind went layout earlier Doubler designs Doubler has simple structure excellent flying quali ties decided retain good things make changes necessary different model size engine type Having no experience whatever four-cycle model engines relied data presented various publications rpm prop sizes weights wing loadings two-cycle four-cycle comparisons etc playing game calculated guessing instances extremely lucky and/or research paid off Everything turned out just right first flight made thing Ive found need getting adjusted low-decibel putt-putting en gines have correct thinking concerning falling out sky syndrome related sound fourcycle just keeps boring along steady pace doing maneuvers scalelike graceful usually possible two-cycle engine first flight morning rare cool days late summer wind quartering grass-strip flying field engine fired up rpm adjusted tachometer Flying buddy Leon Folse snap few pictures offer some advice running engine previous experience OS 40 FS smoker checked looked OK taxied out strip lined up opened up throttle waiting high-pitched sound model accelerating never came Easing back stick model came unstuck climbed out very smoothly Everything going fine still hadnt gained confidence engines sound smoker apparatus place smoker tank filled Ahnag oil balance point front center gravity CG envelope model handled very nicely smoker kicked some loops rolls performed order check models perform ance rearward CG removed smoker exhaust stub replaced standard exhaust stack smoker tank emptied tubing Perry pump removed resulted CG being center mark plans loops nice slow round figures rearward CG doing consecutive loops engine just keeps chugging away Four-point rolls stall turns spins snap rolls knife-edge flight square loops inverted flight outside loops done during initial flights JOINER oe DIHEDRAL RIlACE 7 BALSA SHEET-SEE SIDE VIEW DIHEDRAL BRACE RIGHT ~11d-/i II TOP SHEET ENDS TOERII CENTER OPRIB-CENTERIII SHEETED AFTER BOLTIIaII HOLES DRILLED1II 2I 421 SHEET TOP CENTER SECTION AFTER I A-III OMIT TINS BII ONLEFTWBIOI1I II I II IIII II __ ____________________________________ II 1 3/IAO3B5RlRS 1/IBTIA CAP STBIPS I/RI SHEET II II I/IN REBIG ALL ElM IR BALSA 1 II II II II II II II II II I/I IBJSC WIHE II II II II II II II II ___________________________ II II1 III A-a-la ---,-III wP PAHEL EPOIT WELL AFTER WHO ASSEGIRT 0/16011/ATE STOCK RIB lA t/8LITE PLY II -1 c3 RIGHT WING SHOWN MASTER RIB PATTERN SOLDER - 2 LAYERS I/IA PLY \ ci II iii FOR CHORBIG DO [I4I DOUBLER hALITE PLY 3/TRIANGLERR SAAB NOT SHOWN 17flNUTS XSAOI PNO P ABUT AWAT 0/Idol LERIINPWI LITEPLTITEP SERNS MOUNT IATOPOHEETPLACE F B AFTER COWL ELAN 121 1/NA PLY" R TRIANGLE II/A OHEET TRIM l/BSEF\ 21 III ENOHE MOUNT1 FWPBALSA JillRHODR TO OUT__ WLOUTLRWRI PTT SEW/N II ICOWLFAHEESiI. 41TTT /PT PERRYPOOPIiW 101-I/iIIRST SOMOICE~I..1/BLITEP DOWEL BALSA F SITRIAIJGLE U 28 Model Aviation Fc1 010 RARALIER APRIASAR3/INPIT ICo //I. ~ II Full-Size Plans Available. See Page 186 pipI pipI 111115 2I Tiip uJ~J IIIIIpP Ii 116-iIa II IIa iiII II p1II IPII ppPpP I3/16 ORBALSALOPTO _IIpp 4~P I DWRAl VERSION VAPITS LAST RN POR VP OLRISPRRT PYLON RACER OR HOTTERAEATICS DB p/LPYE PLY SCRAP TRIAPILE A/P6RALSA ROOT BR M16PEJN 0/tRALSA SPK16 JORIER STAB kh IZER FWP I/l UTE PLY AiZ] 51616 LOCATERS YIP JIG P06161616 ASSENALY SCRAP BALSA 16 PlY APLCRAIPK P406041 OfLOJN CONTEST STOCK S EAO tIP4FZ 1/PLY3 I/a UTE PLYP7 1/8LITE PLY o0 -FFtSELAGE__ __F -oio 004N0TOP Sf00 TUBE ITmI3/NCBRSGRIJNYLSA 16 N FIN --II 1pIL FUSELAGE SIDE VIEW- _____________ __________ _____ 601/B ______________ ________________ ___ OOWEL-OPTIORALWR4Gp p1 _- PATE I'I. --I---PpP pP/BALSA /121P/LITE PP 3/32 CROSS GRAIl ROT FLIER 103/U S/a LITE PIT PiN P64 RWB OLEYT AU EPOSY ydEEN PLY TpIR 019 P6110*45 04 3/OPOE 06101*16 PROJECTED ABRA RElSOJN PlYPPO VETTERN ELEVATOR p/t 191/ ON PSEEOPBROS P4410121 FRI FLAIGE -p/N LITE PPT ROPES OR LPP4 TEROSFSKOpa ALL4PSROSERVEO R144 ELEVATOR 016 IASl ELET STOCK -7 j77 SJG -IA SO 1160 HAM VILE TO FIR RUD ENOEST SI NYL CE 7/I WIEEL SUPER DOUBLER II THE PELADRRNIIB-KO 9P May1987 29 majorcomponents model shown have cut outand readyforassem bly Bolts have installed firewall fuselage sides ready /-in triangle strip longerons /S x 1/4-in stab reinforcement uprights glued place Doublers glued after carefully positioning achieve square fuselage running Zinger 11-6 prop slower steady flight real pleasure Super Doubler II closely resembles earlier Doublers exception front end Also used technique make fuselage shapely did Stephens Akro Laser Sorta PiUs designs provides pleasing form very little effort takes produce Stik Ugly etc fuselage wing MonoKoted fuse lage tail section get doped-finish covering Lightweight silkspan used previous models cover grain Heres authors method securing engine mounting bolts firewall sturdy fuel-proof Anti-twist wire pieces soldered head slots whole business including washers coat ed epoxy System locking slots tabs formers/sides produces fuse lage lightweight strong straight toughen wood Super Doubler II used Sigs Plyspan shiny side out now looks like Plyspan will covering material choice Compared silkspan lighter easier apply after coat uncut dope comes up nice finish sconer 30 Model Aviation Left Tip dihedral jig lain place building board asthewing isassembied Straight reference lines drawn beneath structure may visible magazine reproduction Authors work surface isa piece Celotex laid atopan interiordoor panel lattersupported 2 x 4 frame Right Dihedral joint braced plywood inserted just ahead 3/16-sq trailing edge piece behind spars Left aileron crank mount plate 1/16 plywith curved slot fora linkfrom 90 Goldberg crank 1/16 musicwire pushrod short 90 band slid tip end through rib cutouts crank raised engage bent end underside Right Make initial cut about 1/2 deep cabin section fuselage before applying top sheeting Cabin former F3B place Len i-laces OT polyvinyl sheet have installed saw slots prevent everything being glued together Very useful keep ing fuselage square during assembly 900 angle braces cut scrap balsa Right After entire top has sheeted 3/32 cross-grain balsa make final cut cabin section remove larger fuselage unit Zona Saw good smoke system its fifth servo included model weighs little over 5 lb smoke system omitted 4oz fuel tank used model should weigh about 4 lb 10 oz Recommended control throws shown plans model flies well setup should really consider recommendations starting point adjust throws satisfy flying style should decide clipped-wing version leave ailerons i long move bay smoker unit exhaust stack quite simple make standard K&S tubing piece %2 tubing flared end cut off to receive 0S exhaust pipe nut seat copper gasket smoke chamber made is-in tubing piece i/i6 tubing silver soldered unit can slipped over %2 tubing See picture smoker unit exhaust stub h-in oil feed tubing silver soldered -in tubing just aft /16 tubing unit packed fine steel wool flash off oil passes over hot wool Perry P-20 pump works great installation exit line pump passes through simple open/shut pinch valve crimps silicone tubing Perry pump mounted -in Lite Ply Lite Ply epoxied bottom -in sheet pictures fifth servo operated landing gear switch transmitter actuate pinch valve smoker arrangement course just starting point works reliably now new ideas coming forth others might see some improvements Construction Start making kit parts checking fit may surprised fast model goes gether Select balsa carefully staying away hard heavy stock could substitute straight-grained 3A6 sheet balsa medium weight tail surfaces instead -in contest balsa save bit money used cyanoacrylate glues CyA building Epoxy used plywood parts aliphatic resin used wing sheeting fuselage over 36 long have matched sides balsa sup plier front can short end small piece glued bottom doubler long flat workbench other working space must achieve straight wing An interior door lumberyard excellent surface model building will go over main unusual points construction everyone has own particular method want glue up tail surfaces first go number ways transfer outlines parts onto wood carbon paper under plans measure draw part etc way have found easy accurate use tracing paper paper can see through Place tracing paperover plans trace parts Spray contact adhesive back side traced patterns place patterns appropriate wood cut out parts traced lines Lastly peel off patterns Wing Gut out 22 ribs medium weight quarter-grain balsa Pin bottom spar place over plans place ribs proper location right wing panel omit rib between last bay Pin down rib temporary flange trailing edge Place top spar check ribs standing vertically except root rib Position May1987 31 Throttle pushrod Gold-N-Rod right fuselage side just beyond fusi tank Tubes passing through firewall sealed epoxy Engine fits Hayes iong mount Triangle corners top bottom 1/4-ln sheet former Fl first layer cheek cowl have glued atthis point second layer ply cheeks has glued may able see alIgn ment marks top block Fl 3/32 balsa sides Inside cheek cowls removed before gluIng ply cheeks Y16-sq trailing edge TE piece pin ribs Pin n leading edge LE front ribs Eyeball panel see square hit joints CyA Glue /j6 sheet shear webs place Using long block 220grit paper attached sand -in LE conform shape ribs Glue top /16 LE sheeting place centering edge over middle inboard rib handy Sig mini glue guns apply aliphatic glue rib Put down slow-set CyA along spar LE Place edge sheet over spar roll forward over ribs Aliphatic glue pinsno CyAcan used prefer Slice 3-in-wide sheet quarter-grain /16 balsa two Glue piece over TE location sheet center section yet Glue cap strips place Remove wing panel work surface Slice off jig flanges ribs Pin panel upside down spar Place n leading edge cap under /16 sq pin down cap securely pin wing Glue /16 x 1 -in TE sheet LE sheeting cap strips A6 plywood aileron bellcrank mount Sheet bottom center section Repeat procedure left wing panel remembering omit outer extra rib Install inboard rib shown plans Before assembling wing panels make long straight line workbench Placing panels rear edge bottom spar against line mark dihedral jigs will go under outer rib Pin jigs marks spar locaters proper place panels jig check root ribs fit Block up TE panels center section until level square tip ribs resting firmly jigs Glue root ribs spar stub ends together 5-min epoxy Use Zona Saw trim ribs behind spars order make room dihedral brace Cut away between spars -in sparjoiner Whenthe joiner place epoxy dihedral brace 5-min epoxy Slice away top TE sheeting d Y16-sq also root ribs epoxy rear brace place Using rib lA mark root ribs ahead spars Trim off top half glue lA ribs epoxy FWP place TE stock cut length trialfitted wing panel Hold down panel trailing edge check fit sand necessary glue CyA RWP Lite Ply piece can glued epoxy Mark centerline outboard wing rib glue tips place along triangle reinforcing scraps Sand leading edge sheeting flush -in LE glue -in cap placesanding nice round shape Fuselage necessary use 3 x 36-in wood fuselage start off three sheets straight-grained 3/n x 3-in med ium balsa Slice half Trim edges other two pieces good fit glue sheets together CyA form two 4-in-wide sheets Lay out thrust line piece Draw wing centerline %6 above stab centerline w Continued page 34 32 Model Aviation Ia-in balsa nose piece has glued shaped fuselage corners have rounded whole front end has nicely shaped Careful sanding what takes achieve good results Ply tabs blind nuts attached will receive removable cowl pair 90 scrap balsa triangles hold vertical fin alignment being glued /4In filler piece behind stabilizer has glued make neat tall assembly FOX 40 DELUX ibIy WorIds Finest 40 QC S99 95 / Light welrt z including muff/er spimer Fox 4OBB rht weht kit desns Smooth running 40 Delux smoothest running 40s available Vibration destroys airplanes causes crashes Good cranking compression quick easy hand starts No need buy expensive starter battery charger Choke tilt up tilt down muffler gives mounting options strazht out desn Aluminum spinner included motor other motors have pay extra spinner may fit properly Fox RC motor has check run curb needles set normal operation Fox 40 Delux product 10 years refinement hhly successful concept No undiscovered problems User Friendly term includes lots httle things like curb ad/ustments can reach mounting holes can get fuel line connectors hold tubing also operational characteristics hke willingness start resistance flameouts throttle responsiveness course get superb Fox service 24 Hour shipment parts 3 day rebuild service need cefor price phone call P FOX nrf Pack PO BOX 911 ANDERSON CA 96007 Note Fox Products Are Made U&A Two Piece head construction permits accurately machined combustion chamber glow plug threads much stronger cast material Brass cylinder liner thick hard chrome wearing surface Hard chrome resists wear much better polish chrome nickel used some Fox composite piston desgz utilizes oil absorbing iron band aid upper cylinder lubrication New larger tubular wrist pin locked place roll pin New connecting rod phosphor bronze bushing Oil ho/es both ends 8620 Alloy steel crankshaft carbo-nitrided wear resistant skin Unhke manufacturers grind crankpin before carburizing instead grinding off hard skin Crank has removable prop stud can replaced case accident Large bore front bearing eliminates need step grind crank main associated concentricity leakage problems High spiral carburetor works smoothly gives instant carburetor response Combination thrust washer spinner backplate Ipage lified Trouble free spinner attaching screw Patented Fox oie piece case hih back door hqhter also permits easier rod over crankpin assembly FOR SERVICE OR INFORMATION CALL OR WRITE 5305 TOWSON AVENUE ] FOX MANUFACTURING CO ORT SMITH ARKANSAS 72901 PHONE 501 6461656 R K PRODUCTS 916 365-6700 Ca/I Write Brochure SPECIALIZING IN GIANT SCALE ENGINES AND ACCESSORIES OUR CUSTOM ZENOAN ENGINES FEATURE DUAL OUTLETALUMINUM MUFFLERS DIE-CAST ALUMINUM MOUNTS THROTTLE LINKAGES AND ARE COMPLETELY ASSEMBLED READY TO INSTALL IN YOUR MODEL SMOKE MUFFLERS AND SPRING STARTERS ARE ALSO AVAILABLE AS OPTIONS ZENOAN G-38$11495ZENOAN G-82$21495 CUSTOM 0-3815995CUSTOM G-6224995 CUSTOM 0-38CUSTOM 0-62 w/spring starter16995 pring starter27995 PROPS ZINGERI iSaG-lo$895 18 8-14895 20 n 8-101095 20 n 8-141095 22 8-101195 Add 5250 Postage Handling toeach order COD additional $250 Kits add $750 UPS tiisaIMC now accepted Prices soblect change notice CB / SCALE TAILWHEKL$1395 N0K POWERPLUG250 AMSOIL 100 -I OIL295 WORLD 5-18 FUTUBA2995 G-38 MOUNT1795 0-82 MOUNT1795 CB SPINNERS-30% DON HARRIS SMOKE MUFFLERS5495 B & B SMOKE MUFFLERS2395 WORLD 7 CH NARROW BAND FM RADIO14995 SACHS DOLMAR 37 unfSPtrt8 starter SACHS DOLMAR 52 wlspang Starter MALONEY 100 $34995 38495 12495 ZtN0ER ALUMINUM SPtNNERS 3$1495 3'1595 1795 42095 52395 Sr/u2795 3195 SPRINO STARTER 0-38 & DUADRAS2495 SPRtN0 STARTER 0-623495 34 Model Aviation sides have straight lines except slight curves under over wing location can made n strips bent match straight lines Lay out wing cutout using master rib angling pen marker resulting line /16 wider master Lay out slot stab Cut out both slots fuselage outline Use first side master cuffing other side -in triangle n strips uprights glued place CyA doublers glued contact cement CyA applied around edges Note picture completed sides before being assembled box Pin down sides over top view former F-4 Draw sides together tail post Make sure sides glue Insert former PA doub lers Using scrap pieces cut 900 angle jig fuselage sides glue P-4 place Place piece -in scrap former location F-3 Draw sides together glue F-3 place using 90 angles assure squareness Note picture fuse lage being built Lay out mounting holes fire wall P-2 suit mount will use used Hayes 40 long mount method shown installing engine mount has proven models over years fuel-proof after engine compart ment has epoxied Drill mounting holes run 6-32 bolts washers Temporarily install mount front firewall engage snug up nuts 6-32 bolts Short pieces music wire soldered slots bolt heads followed liberal application epoxy over heads wire Note picture back side firewall before installed Spread apart fuselage enough install firewall slots doublers glue liberal amount epoxy Carefully glue P3B F4B -in top triangle enough glue hold place Zona Saw make partial cut fuselage sides between formers P3 F3B P4 F4B Note picture saw cut being made make complete cut time go about halfway install some poly sheet slots top sheet can glued gluing whole business together top sheeting has glued finish cut remove cabin section Pimsh gluing formers F3B P4B sides cabin section Sheet bottom epoxy LGP place Install throttle pushrod check smooth operation engine place Note picture front end assembly before installation top block Glue /i ply tank floor being careful bind throttle pushrod 6-oz tank shown plans pictures can replaced 4-oz learned initial flights 4Continued page 36 36 Model Aviation oz tank should give flights 10 12 minutes Install fuel tank also smoker tank latter desired method shown pictures slot cut top firewall fuel lines piece balsa glued over lines cavity filled epoxy smoker tank required hole drilled firewall note picture An application epoxy completely fuelproofed front end Place foam around tanks careful bind throttle rod 34-in triangle pieces med -in top bottom sheets glued front end squared up sanding block Mark centerlines sheets also former F 1 note pictures Glue Fl place Mark position 6 x -in cowl flange strips fuselage sides glue place Glue Cl formers cut 4 ply cowl fit against formers flange strips good fit obtained coat side 1-hr epoxy install formers strips pinning place until cured used CyA install second layer coat epoxy just suitable Rough-cut -in balsa nose piece Glue Fl cabin section can pinned back place round corners being sanded front end should sanded final shape shown picture removable section cowl laid out pencil cut off Zona Saw Install ply tabs dowels blind nuts hold cowl place Glue maple wing hold-down blocks going use bolt method wing attachment FWB RWB epoxyglue joints Disregard step going use rubberbands hold wing Instead put -in dowels shown side view Lite Ply rear plate wing hold-down glued first maple block glued Position wing saddle fuselage Get square Pin place drill holes through maple blocks screws Remove wing tap threads Screw wing place slide stabilizer its slot Check stab squareness fuselage wing satisfied glue stab place Attach elevators hinges ply sub-fm Klett aileron fitting /32 tubing V16 wire glued slot ply flange vertical fin check-fitted epoxied place aid scrap 900 angles hold Glue scrap piece balsa slot behind elevator fuselage Wheel pants dress up Super Doubler II make look like miniature copy full-size aircraft difficult make foam used shape shaped foam covered fiberglass cloth epoxy foam dugout remove wheel pants initial flights because field needed Continued page 146 -I — 5f5 FULL LINE METAL SPECIALISTS SPECILISTS IN CUSTOM COX TEE DEE & REED ENGINES 020S 049S 05 IS & 09S ALL CUSTOM & STOCK PARTS VAILABLE INDIVIDUALLY MANY NEW PARTS FOR OLD COX ENGINES IF ITS COX ENGINE CALL US! FREE FUGHT K&B CUSTOMIZED ENGINES ALSO COMPLETE LINE OF U/C & R/C RACING PARTS SOLID UNES RACING WHEELS QUICK FILLS AND MORE.. WE ALSO STOCK KLOTZ OIL BROAD RANGE OF GLOW PLUGS SPECIAL FUEL TUBING & HARD-TO-FIND HARDWARE ESPECIALLY 2-56 & 3-48 SIZES CARBON FIBER COILS PLUGS CONDENSERS SILK TIMERS TRANSISTOR IGNITION SYSTEMS l/2A TEXACO ENGINES EVERYTHING YOU NEED FOR OLD TIMER INCLUDING REPLICA OR WiCK ENGINES NE WI! 1/2A PLAYBOY SR FOR l/2A TEXACO R/C FF ELECTRIC OR SPORT KIT $2995 Safety/Preston Continued page 22 ground After couple minutes engine nmning perfectly throttled back ofasuddenthe Heicopterenginestartedtorev up seconds hovering nicely boom deviation Moments later started climbing What first flight No need trim no need touch control sticks no need transmitter eithet What happened turned out battery voltage dropped below safe level fail-safe devices took control As result Helicopter became just point sky After engine stopped started coming down Hi roho must very proud because after autorotation Helicopter landed minor damage question after What reason fail-safe switches devices since dont know time attitude model really going use would like know readers have reported anything favor device really want opinion switch secondary frequency during emer gency because purpose lose control rather have control surfaces model move preset positions am familiar radio system involved seems fail-safe device throttle reversed drop battery voltage level unsafe should have closed throttle rather opened However issue question Antonis has asked readers What wants know advantage having con trol surfaces go preset position neutral case flying controls event trans mitter signal lost whatever reason Cer tainly isnt going help Aerobatic flier save model control surfaces suddenly go neutral middle complex maneuver other hand Im favor having engine go low throttle upon loss transmitter signal receiver battery voltage drops below safe level readers wish express opinions Id welcome letters Have safe month John Preston 2812 Northampton Sr N W Washington DC 20015 responding advertisers mention thatyou read aboutthem ModelAviation Doubler/Shepherd Continued page 36 be mowed grass little too tall lettering model done dry transfers art supply store coat clear Sig Skybrite applied over protection sponsor decals canopy model auto decal sheets pilot head started out Williams Bros figure back side goggles painted black enamel give appearance sunglasses am pleased way project has turned out easy build flies very nicely will either clip current wing build another reduced span will also trying other engines model ing event becoming quite popular local clubs 500 sport racer stock Royal 25s HR 25s clippedwing version should fit right expanding Pylon Racing event model qsite change pace decide build hope will have fun enjoy Remember fourcycles dont scream just putt-putt Radio Technique/Myers Continued page 39 FCC time will able tell whether system contemplating has certificated according AMA Guidelines Right now have nothing Resource managemenl Noninterfrring RC channel arrangements think Dennis Tier ney has best solution See Whistle Blows Dont Fly page 93 et seq Model Aviation March 1987 urge Dennis con tinue working design until includes 80 RC channels scheduled 1991 well seven old channels 27 MHz 50 MHz 53 MHz channels Besides should reduce wiring double-sided PC board will put him position sell useful gimmick RC airplane boat car clubs over United States Canada have feeling once people see easily Dennis gadget works organization will want Its sort self-policing transmitter impound manager Go Dennis 146 Model Aviation OUR REV-UP INVENTORY AVERAGES 12000 PROPSIII SEE OUR AD LAST MONTH FOR LIST OF PROPS AND PRICES ding iiThg ring. AJ iNTERCEPTOR4e9S compiete U-build Kit photos easy instructions NOTEPLE*SEAOO 5300 O P00*0f S DANOCING nESt 00E URUILD OES ADO TEN PERCENT OP PEICE POD EACA ADbrtIONAL ~CRAFT COMPANY RO Box 68132 Portland OR 97268 1000/0 Satisfaction Ouaraneea Money Back SEND 450 per 5/8 ID Coupler or550per3/4ID DANA AEROSPACE CORP 1110 E 5th St rior WI 54880 OLD TIMER SUPPLIES ORDER DY MAIL OR PHONE 714 830-5162 SOAR V NO COD VISA MASTERCARD WELCOME DEALER INQUIRIES INVITED ALL PRICES POSTPAID MINIMUM ORDER *1000 FOR INSURANCE ADD $100 ORDERS SHIPPED WITHIN 24 HAS EAI R~ifl#MT0 Aflfl * TA V

NO OCR TEXT NO OCR TEXT isa certain beauty uncovered framework guess lithe kind bug bit us years ago says author/designer Shepherd im sure glad no cure Things see vent/drain hole bottom sheet firewall second smoke cham ber screwed place four fiat-head screws holding landing gear fiush sheeting ciean cutouts wheei pants front end cowi ieftwe seethe enginesexhaust stub Perry pump place Notethethrottie pushrod witn bend arm slid over rod engine mount rotated position mount bolts allows easy removal installation engine maintenance right smoke chamber place Silicone feed tube exits pump goes through pinch valve before entering smoker Smoker slipped over short stub end i bolted engine via exhaust nut Left Plumbing forthe engine smoker system pinch valve epoxied tothe inside cheek cowl Perry pump mounted ply line pumptothevalvetothe smoker levisibie Short piecesof brasetubing make handyto fill thetanks frontend Right control center compact left servo smoker valve omit dont go forthe smoker Supports Gold-N-Rods epoxied firmly place also box receiver wires battery receiver neatly packed foam absorb vibration SOME SAY revolution suppose quite true considering long years have used high-rpm over-square piped two-cycle engines Rev olution may too strong word sure four-cycles stay can get little carried away raves modeling publications challenge getting smoker system work four-cycle enough jump head first try Checking financial status credit rating bank found could purchase OS 40 four-stroker get things started Doc Mathews todays pro lific model designers made interesting statement sequel highly-successful Some decorations make model look realistic dont take much time out add much character plane photos author FINGER HOLE FOR CHOKING OS SHEET 1/1 21 2 LAYERS 1/61 PLY SUPER DOUBLER II -BRAD SHEPHERD H I3/163/8 SPARS RPBA-219 62 YIP 5 GLUE TO FIN 1/150 MED HARD I/QGRAIN ICONTESTS TOCI SIG I/4X2ELEV STOCK 3/32 CROSSORAINs N CROSS GRAIN EDT TOM1/4 OGRAIN CONTEST STOCK 1/16 WE BEING 5 1/16 SHEET ACE 7/8 WHEEL 5/16X1-1/4 TE STOCK l/16X 1/CAP STRIPS LL RIBS LAL3/16BALSA previous effort can often become disaster wit Good Daddy 111111 Rumble 111 III etc Docs experience scaling up down Free Flight models shown him good qualities some times lost scaling process mind going about process putting some lines paper fit 0 S 40 FS mind went layout earlier Doubler designs Doubler has simple structure excellent flying quali ties decided retain good things make changes necessary different model size engine type Having no experience whatever four-cycle model engines relied data presented various publications rpm prop sizes weights wing loadings two-cycle four-cycle comparisons etc playing game calculated guessing instances extremely lucky and/or research paid off Everything turned out just right first flight made thing Ive found need getting adjusted low-decibel putt-putting en gines have correct thinking concerning falling out sky syndrome related sound fourcycle just keeps boring along steady pace doing maneuvers scalelike graceful usually possible two-cycle engine first flight morning rare cool days late summer wind quartering grass-strip flying field engine fired up rpm adjusted tachometer Flying buddy Leon Folse snap few pictures offer some advice running engine previous experience OS 40 FS smoker checked looked OK taxied out strip lined up opened up throttle waiting high-pitched sound model accelerating never came Easing back stick model came unstuck climbed out very smoothly Everything going fine still hadnt gained confidence engines sound smoker apparatus place smoker tank filled Ahnag oil balance point front center gravity CG envelope model handled very nicely smoker kicked some loops rolls performed order check models perform ance rearward CG removed smoker exhaust stub replaced standard exhaust stack smoker tank emptied tubing Perry pump removed resulted CG being center mark plans loops nice slow round figures rearward CG doing consecutive loops engine just keeps chugging away Four-point rolls stall turns spins snap rolls knife-edge flight square loops inverted flight outside loops done during initial flights JOINER oe DIHEDRAL RIlACE 7 BALSA SHEET-SEE SIDE VIEW DIHEDRAL BRACE RIGHT ~11d-/i II TOP SHEET ENDS TOERII CENTER OPRIB-CENTERIII SHEETED AFTER BOLTIIaII HOLES DRILLED1II 2I 421 SHEET TOP CENTER SECTION AFTER I A-III OMIT TINS BII ONLEFTWBIOI1I II I II IIII II __ ____________________________________ II 1 3/IAO3B5RlRS 1/IBTIA CAP STBIPS I/RI SHEET II II I/IN REBIG ALL ElM IR BALSA 1 II II II II II II II II II I/I IBJSC WIHE II II II II II II II II ___________________________ II II1 III A-a-la ---,-III wP PAHEL EPOIT WELL AFTER WHO ASSEGIRT 0/16011/ATE STOCK RIB lA t/8LITE PLY II -1 c3 RIGHT WING SHOWN MASTER RIB PATTERN SOLDER - 2 LAYERS I/IA PLY \ ci II iii FOR CHORBIG DO [I4I DOUBLER hALITE PLY 3/TRIANGLERR SAAB NOT SHOWN 17flNUTS XSAOI PNO P ABUT AWAT 0/Idol LERIINPWI LITEPLTITEP SERNS MOUNT IATOPOHEETPLACE F B AFTER COWL ELAN 121 1/NA PLY" R TRIANGLE II/A OHEET TRIM l/BSEF\ 21 III ENOHE MOUNT1 FWPBALSA JillRHODR TO OUT__ WLOUTLRWRI PTT SEW/N II ICOWLFAHEESiI. 41TTT /PT PERRYPOOPIiW 101-I/iIIRST SOMOICE~I..1/BLITEP DOWEL BALSA F SITRIAIJGLE U 28 Model Aviation Fc1 010 RARALIER APRIASAR3/INPIT ICo //I. ~ II Full-Size Plans Available. See Page 186 pipI pipI 111115 2I Tiip uJ~J IIIIIpP Ii 116-iIa II IIa iiII II p1II IPII ppPpP I3/16 ORBALSALOPTO _IIpp 4~P I DWRAl VERSION VAPITS LAST RN POR VP OLRISPRRT PYLON RACER OR HOTTERAEATICS DB p/LPYE PLY SCRAP TRIAPILE A/P6RALSA ROOT BR M16PEJN 0/tRALSA SPK16 JORIER STAB kh IZER FWP I/l UTE PLY AiZ] 51616 LOCATERS YIP JIG P06161616 ASSENALY SCRAP BALSA 16 PlY APLCRAIPK P406041 OfLOJN CONTEST STOCK S EAO tIP4FZ 1/PLY3 I/a UTE PLYP7 1/8LITE PLY o0 -FFtSELAGE__ __F -oio 004N0TOP Sf00 TUBE ITmI3/NCBRSGRIJNYLSA 16 N FIN --II 1pIL FUSELAGE SIDE VIEW- _____________ __________ _____ 601/B ______________ ________________ ___ OOWEL-OPTIORALWR4Gp p1 _- PATE I'I. --I---PpP pP/BALSA /121P/LITE PP 3/32 CROSS GRAIl ROT FLIER 103/U S/a LITE PIT PiN P64 RWB OLEYT AU EPOSY ydEEN PLY TpIR 019 P6110*45 04 3/OPOE 06101*16 PROJECTED ABRA RElSOJN PlYPPO VETTERN ELEVATOR p/t 191/ ON PSEEOPBROS P4410121 FRI FLAIGE -p/N LITE PPT ROPES OR LPP4 TEROSFSKOpa ALL4PSROSERVEO R144 ELEVATOR 016 IASl ELET STOCK -7 j77 SJG -IA SO 1160 HAM VILE TO FIR RUD ENOEST SI NYL CE 7/I WIEEL SUPER DOUBLER II THE PELADRRNIIB-KO 9P May1987 29 majorcomponents model shown have cut outand readyforassem bly Bolts have installed firewall fuselage sides ready /-in triangle strip longerons /S x 1/4-in stab reinforcement uprights glued place Doublers glued after carefully positioning achieve square fuselage running Zinger 11-6 prop slower steady flight real pleasure Super Doubler II closely resembles earlier Doublers exception front end Also used technique make fuselage shapely did Stephens Akro Laser Sorta PiUs designs provides pleasing form very little effort takes produce Stik Ugly etc fuselage wing MonoKoted fuse lage tail section get doped-finish covering Lightweight silkspan used previous models cover grain Heres authors method securing engine mounting bolts firewall sturdy fuel-proof Anti-twist wire pieces soldered head slots whole business including washers coat ed epoxy System locking slots tabs formers/sides produces fuse lage lightweight strong straight toughen wood Super Doubler II used Sigs Plyspan shiny side out now looks like Plyspan will covering material choice Compared silkspan lighter easier apply after coat uncut dope comes up nice finish sconer 30 Model Aviation Left Tip dihedral jig lain place building board asthewing isassembied Straight reference lines drawn beneath structure may visible magazine reproduction Authors work surface isa piece Celotex laid atopan interiordoor panel lattersupported 2 x 4 frame Right Dihedral joint braced plywood inserted just ahead 3/16-sq trailing edge piece behind spars Left aileron crank mount plate 1/16 plywith curved slot fora linkfrom 90 Goldberg crank 1/16 musicwire pushrod short 90 band slid tip end through rib cutouts crank raised engage bent end underside Right Make initial cut about 1/2 deep cabin section fuselage before applying top sheeting Cabin former F3B place Len i-laces OT polyvinyl sheet have installed saw slots prevent everything being glued together Very useful keep ing fuselage square during assembly 900 angle braces cut scrap balsa Right After entire top has sheeted 3/32 cross-grain balsa make final cut cabin section remove larger fuselage unit Zona Saw good smoke system its fifth servo included model weighs little over 5 lb smoke system omitted 4oz fuel tank used model should weigh about 4 lb 10 oz Recommended control throws shown plans model flies well setup should really consider recommendations starting point adjust throws satisfy flying style should decide clipped-wing version leave ailerons i long move bay smoker unit exhaust stack quite simple make standard K&S tubing piece %2 tubing flared end cut off to receive 0S exhaust pipe nut seat copper gasket smoke chamber made is-in tubing piece i/i6 tubing silver soldered unit can slipped over %2 tubing See picture smoker unit exhaust stub h-in oil feed tubing silver soldered -in tubing just aft /16 tubing unit packed fine steel wool flash off oil passes over hot wool Perry P-20 pump works great installation exit line pump passes through simple open/shut pinch valve crimps silicone tubing Perry pump mounted -in Lite Ply Lite Ply epoxied bottom -in sheet pictures fifth servo operated landing gear switch transmitter actuate pinch valve smoker arrangement course just starting point works reliably now new ideas coming forth others might see some improvements Construction Start making kit parts checking fit may surprised fast model goes gether Select balsa carefully staying away hard heavy stock could substitute straight-grained 3A6 sheet balsa medium weight tail surfaces instead -in contest balsa save bit money used cyanoacrylate glues CyA building Epoxy used plywood parts aliphatic resin used wing sheeting fuselage over 36 long have matched sides balsa sup plier front can short end small piece glued bottom doubler long flat workbench other working space must achieve straight wing An interior door lumberyard excellent surface model building will go over main unusual points construction everyone has own particular method want glue up tail surfaces first go number ways transfer outlines parts onto wood carbon paper under plans measure draw part etc way have found easy accurate use tracing paper paper can see through Place tracing paperover plans trace parts Spray contact adhesive back side traced patterns place patterns appropriate wood cut out parts traced lines Lastly peel off patterns Wing Gut out 22 ribs medium weight quarter-grain balsa Pin bottom spar place over plans place ribs proper location right wing panel omit rib between last bay Pin down rib temporary flange trailing edge Place top spar check ribs standing vertically except root rib Position May1987 31 Throttle pushrod Gold-N-Rod right fuselage side just beyond fusi tank Tubes passing through firewall sealed epoxy Engine fits Hayes iong mount Triangle corners top bottom 1/4-ln sheet former Fl first layer cheek cowl have glued atthis point second layer ply cheeks has glued may able see alIgn ment marks top block Fl 3/32 balsa sides Inside cheek cowls removed before gluIng ply cheeks Y16-sq trailing edge TE piece pin ribs Pin n leading edge LE front ribs Eyeball panel see square hit joints CyA Glue /j6 sheet shear webs place Using long block 220grit paper attached sand -in LE conform shape ribs Glue top /16 LE sheeting place centering edge over middle inboard rib handy Sig mini glue guns apply aliphatic glue rib Put down slow-set CyA along spar LE Place edge sheet over spar roll forward over ribs Aliphatic glue pinsno CyAcan used prefer Slice 3-in-wide sheet quarter-grain /16 balsa two Glue piece over TE location sheet center section yet Glue cap strips place Remove wing panel work surface Slice off jig flanges ribs Pin panel upside down spar Place n leading edge cap under /16 sq pin down cap securely pin wing Glue /16 x 1 -in TE sheet LE sheeting cap strips A6 plywood aileron bellcrank mount Sheet bottom center section Repeat procedure left wing panel remembering omit outer extra rib Install inboard rib shown plans Before assembling wing panels make long straight line workbench Placing panels rear edge bottom spar against line mark dihedral jigs will go under outer rib Pin jigs marks spar locaters proper place panels jig check root ribs fit Block up TE panels center section until level square tip ribs resting firmly jigs Glue root ribs spar stub ends together 5-min epoxy Use Zona Saw trim ribs behind spars order make room dihedral brace Cut away between spars -in sparjoiner Whenthe joiner place epoxy dihedral brace 5-min epoxy Slice away top TE sheeting d Y16-sq also root ribs epoxy rear brace place Using rib lA mark root ribs ahead spars Trim off top half glue lA ribs epoxy FWP place TE stock cut length trialfitted wing panel Hold down panel trailing edge check fit sand necessary glue CyA RWP Lite Ply piece can glued epoxy Mark centerline outboard wing rib glue tips place along triangle reinforcing scraps Sand leading edge sheeting flush -in LE glue -in cap placesanding nice round shape Fuselage necessary use 3 x 36-in wood fuselage start off three sheets straight-grained 3/n x 3-in med ium balsa Slice half Trim edges other two pieces good fit glue sheets together CyA form two 4-in-wide sheets Lay out thrust line piece Draw wing centerline %6 above stab centerline w Continued page 34 32 Model Aviation Ia-in balsa nose piece has glued shaped fuselage corners have rounded whole front end has nicely shaped Careful sanding what takes achieve good results Ply tabs blind nuts attached will receive removable cowl pair 90 scrap balsa triangles hold vertical fin alignment being glued /4In filler piece behind stabilizer has glued make neat tall assembly FOX 40 DELUX ibIy WorIds Finest 40 QC S99 95 / Light welrt z including muff/er spimer Fox 4OBB rht weht kit desns Smooth running 40 Delux smoothest running 40s available Vibration destroys airplanes causes crashes Good cranking compression quick easy hand starts No need buy expensive starter battery charger Choke tilt up tilt down muffler gives mounting options strazht out desn Aluminum spinner included motor other motors have pay extra spinner may fit properly Fox RC motor has check run curb needles set normal operation Fox 40 Delux product 10 years refinement hhly successful concept No undiscovered problems User Friendly term includes lots httle things like curb ad/ustments can reach mounting holes can get fuel line connectors hold tubing also operational characteristics hke willingness start resistance flameouts throttle responsiveness course get superb Fox service 24 Hour shipment parts 3 day rebuild service need cefor price phone call P FOX nrf Pack PO BOX 911 ANDERSON CA 96007 Note Fox Products Are Made U&A Two Piece head construction permits accurately machined combustion chamber glow plug threads much stronger cast material Brass cylinder liner thick hard chrome wearing surface Hard chrome resists wear much better polish chrome nickel used some Fox composite piston desgz utilizes oil absorbing iron band aid upper cylinder lubrication New larger tubular wrist pin locked place roll pin New connecting rod phosphor bronze bushing Oil ho/es both ends 8620 Alloy steel crankshaft carbo-nitrided wear resistant skin Unhke manufacturers grind crankpin before carburizing instead grinding off hard skin Crank has removable prop stud can replaced case accident Large bore front bearing eliminates need step grind crank main associated concentricity leakage problems High spiral carburetor works smoothly gives instant carburetor response Combination thrust washer spinner backplate Ipage lified Trouble free spinner attaching screw Patented Fox oie piece case hih back door hqhter also permits easier rod over crankpin assembly FOR SERVICE OR INFORMATION CALL OR WRITE 5305 TOWSON AVENUE ] FOX MANUFACTURING CO ORT SMITH ARKANSAS 72901 PHONE 501 6461656 R K PRODUCTS 916 365-6700 Ca/I Write Brochure SPECIALIZING IN GIANT SCALE ENGINES AND ACCESSORIES OUR CUSTOM ZENOAN ENGINES FEATURE DUAL OUTLETALUMINUM MUFFLERS DIE-CAST ALUMINUM MOUNTS THROTTLE LINKAGES AND ARE COMPLETELY ASSEMBLED READY TO INSTALL IN YOUR MODEL SMOKE MUFFLERS AND SPRING STARTERS ARE ALSO AVAILABLE AS OPTIONS ZENOAN G-38$11495ZENOAN G-82$21495 CUSTOM 0-3815995CUSTOM G-6224995 CUSTOM 0-38CUSTOM 0-62 w/spring starter16995 pring starter27995 PROPS ZINGERI iSaG-lo$895 18 8-14895 20 n 8-101095 20 n 8-141095 22 8-101195 Add 5250 Postage Handling toeach order COD additional $250 Kits add $750 UPS tiisaIMC now accepted Prices soblect change notice CB / SCALE TAILWHEKL$1395 N0K POWERPLUG250 AMSOIL 100 -I OIL295 WORLD 5-18 FUTUBA2995 G-38 MOUNT1795 0-82 MOUNT1795 CB SPINNERS-30% DON HARRIS SMOKE MUFFLERS5495 B & B SMOKE MUFFLERS2395 WORLD 7 CH NARROW BAND FM RADIO14995 SACHS DOLMAR 37 unfSPtrt8 starter SACHS DOLMAR 52 wlspang Starter MALONEY 100 $34995 38495 12495 ZtN0ER ALUMINUM SPtNNERS 3$1495 3'1595 1795 42095 52395 Sr/u2795 3195 SPRINO STARTER 0-38 & DUADRAS2495 SPRtN0 STARTER 0-623495 34 Model Aviation sides have straight lines except slight curves under over wing location can made n strips bent match straight lines Lay out wing cutout using master rib angling pen marker resulting line /16 wider master Lay out slot stab Cut out both slots fuselage outline Use first side master cuffing other side -in triangle n strips uprights glued place CyA doublers glued contact cement CyA applied around edges Note picture completed sides before being assembled box Pin down sides over top view former F-4 Draw sides together tail post Make sure sides glue Insert former PA doub lers Using scrap pieces cut 900 angle jig fuselage sides glue P-4 place Place piece -in scrap former location F-3 Draw sides together glue F-3 place using 90 angles assure squareness Note picture fuse lage being built Lay out mounting holes fire wall P-2 suit mount will use used Hayes 40 long mount method shown installing engine mount has proven models over years fuel-proof after engine compart ment has epoxied Drill mounting holes run 6-32 bolts washers Temporarily install mount front firewall engage snug up nuts 6-32 bolts Short pieces music wire soldered slots bolt heads followed liberal application epoxy over heads wire Note picture back side firewall before installed Spread apart fuselage enough install firewall slots doublers glue liberal amount epoxy Carefully glue P3B F4B -in top triangle enough glue hold place Zona Saw make partial cut fuselage sides between formers P3 F3B P4 F4B Note picture saw cut being made make complete cut time go about halfway install some poly sheet slots top sheet can glued gluing whole business together top sheeting has glued finish cut remove cabin section Pimsh gluing formers F3B P4B sides cabin section Sheet bottom epoxy LGP place Install throttle pushrod check smooth operation engine place Note picture front end assembly before installation top block Glue /i ply tank floor being careful bind throttle pushrod 6-oz tank shown plans pictures can replaced 4-oz learned initial flights 4Continued page 36 36 Model Aviation oz tank should give flights 10 12 minutes Install fuel tank also smoker tank latter desired method shown pictures slot cut top firewall fuel lines piece balsa glued over lines cavity filled epoxy smoker tank required hole drilled firewall note picture An application epoxy completely fuelproofed front end Place foam around tanks careful bind throttle rod 34-in triangle pieces med -in top bottom sheets glued front end squared up sanding block Mark centerlines sheets also former F 1 note pictures Glue Fl place Mark position 6 x -in cowl flange strips fuselage sides glue place Glue Cl formers cut 4 ply cowl fit against formers flange strips good fit obtained coat side 1-hr epoxy install formers strips pinning place until cured used CyA install second layer coat epoxy just suitable Rough-cut -in balsa nose piece Glue Fl cabin section can pinned back place round corners being sanded front end should sanded final shape shown picture removable section cowl laid out pencil cut off Zona Saw Install ply tabs dowels blind nuts hold cowl place Glue maple wing hold-down blocks going use bolt method wing attachment FWB RWB epoxyglue joints Disregard step going use rubberbands hold wing Instead put -in dowels shown side view Lite Ply rear plate wing hold-down glued first maple block glued Position wing saddle fuselage Get square Pin place drill holes through maple blocks screws Remove wing tap threads Screw wing place slide stabilizer its slot Check stab squareness fuselage wing satisfied glue stab place Attach elevators hinges ply sub-fm Klett aileron fitting /32 tubing V16 wire glued slot ply flange vertical fin check-fitted epoxied place aid scrap 900 angles hold Glue scrap piece balsa slot behind elevator fuselage Wheel pants dress up Super Doubler II make look like miniature copy full-size aircraft difficult make foam used shape shaped foam covered fiberglass cloth epoxy foam dugout remove wheel pants initial flights because field needed Continued page 146 -I — 5f5 FULL LINE METAL SPECIALISTS SPECILISTS IN CUSTOM COX TEE DEE & REED ENGINES 020S 049S 05 IS & 09S ALL CUSTOM & STOCK PARTS VAILABLE INDIVIDUALLY MANY NEW PARTS FOR OLD COX ENGINES IF ITS COX ENGINE CALL US! FREE FUGHT K&B CUSTOMIZED ENGINES ALSO COMPLETE LINE OF U/C & R/C RACING PARTS SOLID UNES RACING WHEELS QUICK FILLS AND MORE.. WE ALSO STOCK KLOTZ OIL BROAD RANGE OF GLOW PLUGS SPECIAL FUEL TUBING & HARD-TO-FIND HARDWARE ESPECIALLY 2-56 & 3-48 SIZES CARBON FIBER COILS PLUGS CONDENSERS SILK TIMERS TRANSISTOR IGNITION SYSTEMS l/2A TEXACO ENGINES EVERYTHING YOU NEED FOR OLD TIMER INCLUDING REPLICA OR WiCK ENGINES NE WI! 1/2A PLAYBOY SR FOR l/2A TEXACO R/C FF ELECTRIC OR SPORT KIT $2995 Safety/Preston Continued page 22 ground After couple minutes engine nmning perfectly throttled back ofasuddenthe Heicopterenginestartedtorev up seconds hovering nicely boom deviation Moments later started climbing What first flight No need trim no need touch control sticks no need transmitter eithet What happened turned out battery voltage dropped below safe level fail-safe devices took control As result Helicopter became just point sky After engine stopped started coming down Hi roho must very proud because after autorotation Helicopter landed minor damage question after What reason fail-safe switches devices since dont know time attitude model really going use would like know readers have reported anything favor device really want opinion switch secondary frequency during emer gency because purpose lose control rather have control surfaces model move preset positions am familiar radio system involved seems fail-safe device throttle reversed drop battery voltage level unsafe should have closed throttle rather opened However issue question Antonis has asked readers What wants know advantage having con trol surfaces go preset position neutral case flying controls event trans mitter signal lost whatever reason Cer tainly isnt going help Aerobatic flier save model control surfaces suddenly go neutral middle complex maneuver other hand Im favor having engine go low throttle upon loss transmitter signal receiver battery voltage drops below safe level readers wish express opinions Id welcome letters Have safe month John Preston 2812 Northampton Sr N W Washington DC 20015 responding advertisers mention thatyou read aboutthem ModelAviation Doubler/Shepherd Continued page 36 be mowed grass little too tall lettering model done dry transfers art supply store coat clear Sig Skybrite applied over protection sponsor decals canopy model auto decal sheets pilot head started out Williams Bros figure back side goggles painted black enamel give appearance sunglasses am pleased way project has turned out easy build flies very nicely will either clip current wing build another reduced span will also trying other engines model ing event becoming quite popular local clubs 500 sport racer stock Royal 25s HR 25s clippedwing version should fit right expanding Pylon Racing event model qsite change pace decide build hope will have fun enjoy Remember fourcycles dont scream just putt-putt Radio Technique/Myers Continued page 39 FCC time will able tell whether system contemplating has certificated according AMA Guidelines Right now have nothing Resource managemenl Noninterfrring RC channel arrangements think Dennis Tier ney has best solution See Whistle Blows Dont Fly page 93 et seq Model Aviation March 1987 urge Dennis con tinue working design until includes 80 RC channels scheduled 1991 well seven old channels 27 MHz 50 MHz 53 MHz channels Besides should reduce wiring double-sided PC board will put him position sell useful gimmick RC airplane boat car clubs over United States Canada have feeling once people see easily Dennis gadget works organization will want Its sort self-policing transmitter impound manager Go Dennis 146 Model Aviation OUR REV-UP INVENTORY AVERAGES 12000 PROPSIII SEE OUR AD LAST MONTH FOR LIST OF PROPS AND PRICES ding iiThg ring. AJ iNTERCEPTOR4e9S compiete U-build Kit photos easy instructions NOTEPLE*SEAOO 5300 O P00*0f S DANOCING nESt 00E URUILD OES ADO TEN PERCENT OP PEICE POD EACA ADbrtIONAL ~CRAFT COMPANY RO Box 68132 Portland OR 97268 1000/0 Satisfaction Ouaraneea Money Back SEND 450 per 5/8 ID Coupler or550per3/4ID DANA AEROSPACE CORP 1110 E 5th St rior WI 54880 OLD TIMER SUPPLIES ORDER DY MAIL OR PHONE 714 830-5162 SOAR V NO COD VISA MASTERCARD WELCOME DEALER INQUIRIES INVITED ALL PRICES POSTPAID MINIMUM ORDER *1000 FOR INSURANCE ADD $100 ORDERS SHIPPED WITHIN 24 HAS EAI R~ifl#MT0 Aflfl * TA V