NO OCR TEXT NO OCR TEXT I SCENT I- I CSKCBc-CO lICK I I, ROCK-~c Alliii II JfpgTiC rI ICSONOOK PSFT IllsP5060110 0* FROB 106F0OOSKICK 0300 3~CO NKKKCOAIE01ItQS3i l&LCMCOCOBCCSOKSAL FIN SINK OKOCCISO ICSO0 PLOICSPLO0-00' r OCIKOO3KL573 OC OKKOKII OOEKLOCOSIK I..KOONlFS2PLO ICC SOUK 04013 pOKOOmI 40530 TMOSOKKL Naturally enough Don felt should seek aircraft similar layout Phoenix Zlin 526 726 series offered variety designs somewhat like Phoenix low-wing long-tail moment vehicles slightly swept wings Just finding full-scale aerobatic bird lines along success ful model design going enough however arrive winning design totally new event purpose avoid model flying characteristics stress scale realism decided go large light Large add realism presentation ease attitude recognition pilot judge Also large add drag slower flight again realism also help keep airplane 1200 box maneuvers performed Light weight considered essential vertical performance minimizing wing loading would allow sharp square comers flaps Another advantage light weight aerobatic aircraft Seen rear color-scheme lines emphasize feeling forward motion tenna strung stabilizer tip 12 Model Aviation Well-executed nose cowling really mean much Details ot tibergiass cowi snow up we. shotnote handling 4.m asn4 tho *sonInn Mir nnnnmnfl Just another picture provide another eyeview sne color scneme 11101 IS unarime Brown no Ice Mnlc fInuthrnusnl mumfflsr FULL SIZE PLANS AVAILABLE SEE PAGE 128 AICASONS LOAPJC/KAILWAASE7$5/SKOAKL PSOAOPCO oocsocxPSCMSATSSIALCCT n5/NACENT SAC III I S/SFLAT TOP SSAOSOLrCI S/A ISOCK 50 P55COMAI/ASPASTAPESS ACAS STACK SPACES/L/5S/SEALKM /LOS OP S/TA SCT P575555 ALLSACA SOOT ASK CT1 COT SACS/SBEAPtATPS SANK STACK1-U ACTAC PAN SCAM MASKS SAS TON ONE COLT AK/Sot5Ao5~OS MONET - X SET *I-2PM51 SAra S/lA SONTAIIfiAAA1AM NE iS/IA CSIAL-0515451C jF 05/IS ACAECttP tIZVCN II /S/ AGEMACAT POAS COATCCCNACCS~ SACASOC OCITSJ PANEL/Cl PS SIS/INOS ICS1/AMALSOp55 PCS 5/5505/SPM/CPBS MELLC PA ACCOLH OAMCS~ SOMI I/A SNUASO I I/S PCCI/A CCC Ii~2F /6II-I/-6-/vII//OSSOASK ACOOCENLACACICS OPI X KOCCOAOKkC /0 POSECCOK NOES _____________________________________________ III ThI jO fli AI EL PM II/A A/ALE MOCCA MO/NTCUT FRAN/NPUSECSOE ASKS IK SESOLOSCEKTSICK/AC PLO 00/MAPS/NO SOEKC IT IPASACNRO lASS PEAPSACALPSKLTION 00 I/S MACSMPTACONPSO7T- NOKOSjS/AC SOAPS rIIU/SSSOAAK~~ I/AS/C/ASS0I U[I II pIFS / H0500050/SC C/SPATS NOCCIOMA010 1/SOPLO1/ [ CUCTACAC 5/ASCOEC I I/N So/SECSET KACM/SF jMgj0I/SPLO5~ ISN-IS I/SNCUOSE] NLAOS CANE II / MOSPANI I/SN/C/COCKI/SM/AIOiMSj-ACOAS ~CUASE S SUNKCUT PACM I/S N/SECI II/MM/TO/CNL ASK CANOPY SE/CP1no 0550 CASASSICTS N/ASS/SN I CKASNKSO PLACE ----S often overlooked reduction inertia property also opposes cessation characteristics exactly what dont want angular moments inertia rotation airplane already rotating event precision point rolls snap An angular moment inertia mass property other words airplane high angular rolls required 3T maneuvers aircraft oppotes its rotation about moment inertia roll hard start rolling keeping structural weight absolute either its yaw pitch roll axis same difficult stop rolling once starts minimum could reduce moments February 1980 13 I I unsandL A/SSBCONAC /SSASSAC US SEA resmivemy simpie details complete tail detaches two separate pieces SACS ISS/odS 555 SES/Sy uc aeparaoeo orom inc stanhlizer reattached fuselage dowel two screws Facilitates transport i ysHIToo rU L 5QUARE RETRACT BEAM OUT TO BLOCS PLODD 5H0W 0 Up d\m ALTERNATE WING CONSTRUCTiON IS 3/3Z BALSA RIBS WITH SAME SPARS LEADING TRAILING EDGES 3/32 SHEET FRONT CECKING AEROCOMPOSITE CANOPY RUDDER & ELEVAlOR NYRODS TO SERVOS 3/8 BALSAN MIDDLE FAIRLEAD 6CKTO TAlL FOUR NO 2 SCREWS SECURE COWLING TO FUSELAGE I/8PIWJOD GUSSETS lOP AND BOTTOM WEBRA 91 ENGINE 2 3/4DIA- SPINNER AEROCOMPOSITES COWLING SCALE TO FIT 1/2 MAPLE ENGINE MOUNT . RECHESlOF-2 2 1/32 PLYWOOD FUSELAGE DOUBLER FROM F-I BELLY N IS CEMENTED 10 BOlTOM OF WING FIRST -24 SCREWS TO SECURE WING THRU 5/8 DOWELS 3A6 DOWELS IMBED INlO FOAM TO ANCHOR L G I/4 PLYVOD PLATFORM FOAM CORE IN RUDDER AND FIN II/4X3/4TE /16 PLYWXfl BOX3/16 X 1/4 FIN POSTI ENCASES STABILIZER1/16 SHEETING 5A6 DOWELS LOCKBALSA RUDDER FOST 1N TO FUSELAGE 3 /8 SQTOP ANDALL SCREWS HERE 3011DM FAIRLEAD 5/ 1600 WELFOR HORN 4-40 SCREWS MOUNT FIN BASETO BOX 4 BALSA DORSAL FOAM CORES / // WS I\~IssFiNPOST /GOLDBERG1/4 X 1/2 BALSA STABLIZER LE 5/16 DOWEL- 3/32 HOLE FOR HORN 1 1/2 DIA TAILWHEEL 1/4 SQ DIAGONALS 1/8 BALSA SIDE RINELS F-I 10 TAL3/16u X 3/8 BOTTOM KEEL V4SQ BOTTOM LONGERONS 10-24 REAR WING HOLD SCREVJS ThRJ 5/8DOWELS 1/8 MUSIC WIRE TOI/I& SHEET BALSATOP AND BOTfOM AILERON SERVOSV16 X 1/4 CAP STRIPS OVER FOAM 1 1/2 TRAILING EDGE STOCK DOUBLED FOR AILERONS 2 RETRACTABLE BELLCRANK ON 1/8 PLYWOOD PLATFOFA 1/4 X BALSA LEADING EDGEHOLLOWED BALSA BLOCK 3DIA MAIN WHEELS SOUTHERN RETRACT SYSTEM FROM SERVO POWER ONLY February 1980 15 1/4 HARD BALSA SPAR FRONT AND REAR TOP AND BCIlTCM inertia insure crisp totally controllable rotations aircraft about its axes finally settled Zlin 526 AS basis project 526 AS singleplace aerobatic low wing faired-in canopy in-line engine wing fairly high aspect ratio implies good roll damping leading edge swept straight trailing edge resulting wing sweep about 4 degrees Thrust line wing horizontal tail separated vertically very much usually means control coupling less likely Vertical tail size large enough scale directly horizontal tail size increased span chord maximum allowable 15% scale engine cowl allowed very neat inverted instal lation Webra 91 chosen power Finally retractable landing gear real aircraft allowed us include feature model well course airplane can improved made some subtle changes within rules hopes achieving model would fly con siderably better true scale replica Sym metrical airfoils substituted wing shortened its aspect ratio reduced widening tip chord wing also moved forward inch lengthen tail moment improve balance thrust line horizontal tail lowered wing raised slightly order bring surfaces nearly line thrust vector width fuselage reduced 15% canopy moved forward inch help knifeedge flight Strip ailerons substituted full-size aircrafts conventional ones horizontal tail increased chord span improve tail volume coefficient other aspects aircraft true scale very close including fuselage cross section aircraft sized 950 sq well over minimum quite bit smaller some other airplanes turned up Vegas weight goal set 9 pounds achieved would result excellent vertical per formance Webra 91 first version built-up wing vertical fin second 526 AS built Steve Rojecki foam wing cut out resemble rib structure added balsa spars sheeting wound up open framework foam wing closely resembling built-up version Both airplanes MonoKote Solar Film covered Epoxypainted fiberglass cowls custom molded canopies added complete vehicles both weighed 8 pounds ready fly minus fuel Initial flights both aircraft very encour aging obvious efforts achieve low angular inertia minimum weight paid off Square corners sharp clean precise starting stopping rolling maneuvers successfullly accomplished airplane fast highly desirable quality flying nearly constant speed high drag large airframe slowed down dives engine pulled vertically little sag due its low 16 Model Aviation Aft fuselage detail showing dowel holes screws attaching tail section Rudder pushrod attaches internally tail-wheel arm steering Larger size models permit flexibility structural design Underside detachable tail Three large holes pruvue eiuu tu ue screws attach fin stabilizer Two holes rear screws attach entire unit fuselage Using Southern RC retractswith Fox wheelsgear swings aft rather sideways duplicate retractable function real craft Servo installation wing aileron servo rear retract servo forward Bands hold screws place fuselage equipment bay dwarfs servo tray receiver forward batteries located under servo tray Note pushrods aluminum tubing weight reliability inside outside snapping maneuvers improved moving center gravity back its current location shown plans snaps also enhanced wing itself airfoil gets thinner toward tip leading edge sharpens outboard Both airplanes flown 1978 Tourn ament Champions new Prototype Pattern original built author flown 14th place finish Don Lowe other built Steve Rojecki flown Steve capacity pattern demonstration flier Steve competitor flew full pattern before judges during training beginning round official flying idea establish base flight judges rather have react differently first few flights round Steve probably got assignment proven flying abilities also because rare individual invited competitor did have qualified airplane event As case new events rules Vegas Prototype Pattern provisional subject change improvement based success first event rules changed 1980 Zlin 526 AS pre sented no longer eligible Vegas too small now minimum size mono plane has increased 1100 sq since Vegas invitational event limited about 25 select competitors unlikely would have built purpose Zlin 526 AS remains attractive model stand-off scale events 60 91 offers exciting bonus full aerobatic capability Construction Its always best tackle toughest building chore first. Normally means wing case fuselage rates first attention fuselage complicated its simulation real airplanes fabric covered longeron structure its provisions removable tail section tail separates fuselage make transporting airplane easier vertical fin may attached fuselage horizontal installed some reason wanted transport fuselage intact elevator halves sticking out happen have ample vehicle like van station wagon dont plan ship airplane Nevada year recom mend build permanent fixed tail surfaces reduces complexity saves weight eliminating lot plywood get started fuselage bulkheads Fl F2 two motor mounts 1/4 sq cross brace 1/16 floor between bulkheads Fl F2 assembled unit using slow setting epoxy Bulkheads F3 through F7 built up sa overlapping corner joints Add doublers join fuselage halves bulkheads F3 through F7 fuselage upside down flat building board aligned top view plans Add bulkheads F8 F9 after removing fuse lage board Before adding forward bulkhead unit epoxy aware fuselage sides will form hour glass top view unit added looks strange requires some good clamping possibly wet ting sides accomplish required order fair longeron-type aft fuselage struc ture smooth-sided nose structure Editors Note consider Zlin super aircraft skilled pilot wants something bit d/ferent special both personaiship heflies andfor highly realistic maneuvers can perform ft took little doing bring together Don Lowe Phoenix Marks given dashing off magazine projects developed design worked out Ken Don pooled wits ship built Ken pilot Lowe last saw Ken fly 1966 meet da4 Vince afellowRC oldtimer sur prised high level workmanship excellent writing long articleand would kits have such fine instructions Weve eliminate another article issue avoid diluting Kens copy top off Don Lowe did climactic commentay based upon piloting experiences basic fuselage box completed upper lower partial bulkheads added Next install 1/4 sq diagonal braces bottom fuselage add sq longerons point sq longerons top bottom edges fuselage sides glued place Fuselage top sheeting installed six pieces Two pieces 1/16 form turtledeck Four pieces 3/32 form top sheeting forward canopy Cross grain ting installed cockpit floor bottom nose after gas tank has installed Note Fuelproof entire gas tank compartment coat epoxy Add four pieces /4 balsa sheet two tail two above wing leading edge help fair longerons tailpost nose Cut wing saddles sheet glue fuselage Add ongerons fuselage sides epoxy plywood gussets strengthen motor mounts Before gluing om sheeting between F8 F9 tail wheel mount bolted F8 Also incorporating detachable tail ood plate should installed aft F9 back fuselage should faced 1/16 plywood flat surface removable tail sits covered 1/16 ply center has cut out aft section fuselage sanded such flat panels Monokote result covered flat upper enter ext center ower ower sq ower longeron finally / sq longeron middle 3/16 om central longeron t back fuselage beveled tapered fair sq longerons back tailpost t above wing leading edge faired sq wing saddle its rear edge feathered fuselage side its forward edge saddle sanded k its aft end about 3/16 thick its forward Continued page 102 February 1980 17 jetacnanie tail aetall shown align ment dowels parting line between vertical fin horizontal tail Ken Bonnema displays bottom ship can admire its color schemebit wild what Looking Better Silicone Tubing LUE LINE Its Thicker Stronger Highly Heat Resis tant Flexible other fuel lines Whats moreBLUE LINE eith er equal lower price others So dont fooled Remember ask original BLUE LINE tubing Send SASE today free catalog fine products El O7kENZ2 44W Prospect St New Haven Conn 06515 PRODUCTS safety radio control flying club needs some system aasure two transmitters same frequency notturnedon same time An orderly system does much avoid looks panic shouting flight lineor worse Generation Products producing com plete set engraved high quality frequency pins club use pins check hoard flight line moments panic can avoided frequency pins made high quality engravers plastic sandwich-like con struction numbers engraved cutting through top layer plastic thereby exposing second layer No paint used no fading wearing away numbers pin contains frequency number also color-codedtO match theflags transmitter Construction pins first rate set should stand up club use considerable time period product review product review product review ZIin/ Bonnema continued page 1 7 edge meets t al fin sanded Monokoted glued after rest fuselage has Monokoted Epoxy wing hold-downs drill yet Wing plans show foam wing mainly cause much simpler build no weight penalty occurred between Rojeckis foam wing built up version original wing half should cut lb/cu ft density foam block least 5 inches thick blocks faced foam wire cutter insure square Align root tip templates block absolutely no twist include dihedral raising centerline tip rib 070 inches above centerline root rib Locate root rib exact same place both blocks wing halves may joined blocks flat surface later Cut out core including spar notches using hot-wire bow Number rib templates before hand equal chord percentage segments hot wire may drawn past identical chord stations times both root tip templates After cores have cut blocks cut Out two templates cardboard thin plywood cutouts cores Place cores back blocks sandwich together place template side cut open areas push piece 1/16 music wire through spaces cut out Slip center-drilled piece l rod over end wire attach current regulated hot leads outside dowels Holding new hot wire wooden dowels run around inside templates thus cutting out area removed Repeat procedure cutout area Tapered spars cut very hard a glued cores Titebond epoxy Keep cores blocks weighted flat surface spars dry Next cut out landing gear unit clearance wheel wells servo boxes linkage channels copper wire forms placed heavy duty soldering gun Epoxy landing gear mounting plates 4-40 blind nuts already installed plates have four 3/16 dowels pro truding down foam extra gluing area added strength Glue bellcrank mounts install bellcranks landing gear linkage Sheet center section leading edge trailing edge 1/16 balsa sheet Slow setting epoxy sparingly applied balsa recommended Spreading epoxy foam does improve bond does add considerable weight Again set cores back blocks weight flat surface sheeting drying After sheeting dry trim excess sand flush foam Add tip blocks 3/16 trailing edge ing edge cap strips Remove sheeting has covered wheel well landing gear cavity Join wing halves flat surface epoxing center section both halves resting foam blocks Weight allow adequate time epoxy set up Ailerons laminated two pieces 1 trailing edge stock glued together longest surface longest surface leading edge bevel get quite enough must sanded allow sufficient aileron throw dowel drilled embedded aileron near root aileron horns essential An experiment 3/32 wire resulted aileron flutter fixed portion wing trailing edge lying between two ailerons laminated balsa sheet Clearance notched front piece Install aileron horn wires brass nylon guides before gluing central trailing edge section Drill holes clear through wing epoxy four ls have drilled through 3/16 wing bolts Sand flush upper lower surfaces wing reinforce wing center section wrap first layer 7-oz fiberglass cloth layer 2oz cloth Drill through hardened fiberglass open wing bolt holes Set wing fuselage align very carefully Run long 3/16 drill through bolt holes already wing drill through plywood wing mounting plates fuselage Remove wing enlarge holes fuselage plates install 10-24 blind nuts Bolt wing fuselage build up belly pan aligns perfectly fuselage Use paper tubes bolt guides through belly pan Cut away fiberglass balsa sheet covering servo box install rails aileron retract servos Rib spacing built up wing shown plans Using tip root templates provided sandwich 15 pieces 3/32 baisa between templates sand stack down form ribs wing half Spar location size un changed foam wing Leading edge trailing edge sheeting cap strips also un changed 1/16 balsa vertical grain spar webbing glued between ribs both front rear spars landing gear mount system shown can used ribs either side must reinforced plywood Wheel wells must built up 1/16 balsa sheet Ailerons tips center section including fiberglass reinforcement unchanged Tail Surfaces Foam cores vertical fin rudder stabilizer elevator cut using templates provided 1 / 16 sheeting epoxied wing surfaces left dry weighted foam blocks flat table Leading trailing edges tip blocks glued after sheeting has trimmed sanded Note 3/16 vertiial fin trailing edge exception glued foam core before sheeting sheeting overlaps Elevators rudder have l installed drilled 3/32 wire control horn joined stabilizer halves wrapped fiberglass cloth shown plans fol lowing steps must adhered 102 Model Aviation Available im 5 sizes fit appli cation about 59 per ft Shown above SUPER BLUE set upwith extra-large tubing 4 reusable ties & end-of-line nozzles $369 per pkg nrnrIiut review nrnduat review nrnduat review Frequency Pins @ $2500/ set Generation Pro ducts Co. Inc. 5512 Southwood Little Rock AR 72205 incorporating removable tail Spot glue mating piece 1/16 ply top plywood tail mounting surface fuselage upper piece should about shorter fuselage piece front edge piece glue another piece 1/16 ply matches upper middle quarter F8 including two 3/16 dowel holes Insert two 3/16 dowels through holes glue plywood floor glue dowels F8 back edge plywood floor glue F9A balsa Glue a lower saddles stabilizer Align stabilizer carefully glue saddles Glue a upper stabilizer saddles cap top saddles 1/16 plywood should now have box structure completely surrounding stabilizer plywood bottom top front balsa back break fuselage yet Spot glue another piece 1/16 plywood top box structure front edge piece glue piece plywood matches uppermost portion F8 including 3/16 dowel hole Also glue two blocks ood top plywood floor shown plans Drill 4-40 clearance hole through center front block clear through stabilizer box Drill two 4-40 clearance holes through rear block again clear through stabilizer box Enlarge three holes ply blocks install 4-40 blind nuts Insert piece 3/16 dowel through its hole glue plywood floor glue dowel F8 Now spot glue piece ood original 1/16 plywood tail mounting surface half-inch space left open behind stabilizer box k should fill entire space should 1/16 short width both sides Drill two 4-40 clearance holes through block through corresponding block fuselage underneath Enlarge holes upper block install two 4-40 blind nuts Now glue piece 1/16 plywood matches back face stabilizer box ood piece just installed 1/16 plywood floor spot glued top stabilizer box glue piece stabilizer box Now take sheeted vertical fin its extended hinge line post cut clearance bottom two plywood blind nut blocks 3/16 dowel mounted upper plywood floor Trim rudder post just contacts plywood blind nut block behind stabilizer box trim vertical fin sheeting fits over outside edges plywood block lines up fueslage sides Glue vertical fin upper plywood floor plywood pieces behind stabilizer box careful glue vertical fin assembly stabilizer box Glue sandtwo balsa blocks fair vertical fin F8 Finally add a dorsal fin assembly dry separate vertical fin assembly fuselage stabilizer box using razor blade break spot glue joints separate stabilizer box fuselage same way Enlarge three holes stabilizer box its lower side holes should opened up lower plywood floor stablizer itself enlarge holes upper plywood cap Glue paper straws act screw guides Now can sit back relax curse yourself building fixed tall fix tail surfaces simply eliminate plywood pieces enlarge balsa pieces accordingly glue everything together permanently Finishing Monokote Solar Film strongly recommended materials closely simulate fabric covering full-scale airplane offer lightest overall weight complete finish fiberglass engine cowl molded cellu lose acetate canopy available Aero composites Corp 411 Townsend Place Dayton 0hio4543 1 cowl frameworkmolded canopy painted match Mono kote colors used paint scheme OK WKE represents Czechoslovakian Team colors other airplane shown done British Aerobatic Team colors Since countries fly Zlin large variety color scheme options choose Installation Radio installation fairly straight forward use 60 stow flight pack battery above gas tank 91 locate battery above servo tray further aft necessary achieve proper CG receiver foam wrapped sits fuselage bay just front servo tray Aileron retract linkage shown drawings plans show independent control horns elevator half require pushrod exits rear fuselage both sides M alternative elevator halves may joined central horn single pushrod concealed fuselage rudder pushrod may attached internally tail wheel steering arm before exits fuselage side its way back rudder Flying 526 AS Zlin designed high-performance machine capable perform ing AMA FAI Vegas Tournament maneuvers Flying aircraft pure pleasure difficult considering its very high performance potential Takeoffs piece 104 Model Aviation Please send mecopies new 5th edition Radio Control Buyers Guide Enclosed $825 copy ordered $725 retail plus $100 postage & handling City State ZIP Return RC Buyers Guide Clifton House Clifton VA 22024 Purchasing R/C Aircraft easy YOUNIQUE AT Hobby Capitol keep large ready supply Custom-But RC Aircraft Kits Engines RC Units times And. thanks years experience dealing people sections US. prepare special one-of-a-kind RC Aircraft special one-ofa-kind RC flyer demands unique look express tastes Chances youll find custom paint finish exquisite detailed cockpit interiors glassed engine compartments real scale wheels custom grilled nose section will knock socks offi l probably never see another like cause Hobby Capitol expert stressed preparation goes far beyond standard checkout RC shoppers turning up increasing numbers convenient showroom because word out. outstanding buys service finest selection unique RC Aircraft anywhere its HOBBY CAPITOL Old Ignition Trade-in Buy sell old time ignition engines Box up what yau have send us honest appraisal could worth new proportional set have engines can also start collection welcome built-up airplanes used proportionals old time ignition engines Come trade us Top dollar Custom-1311t-RjC Built Order Plans Ft stock choose Its s40000 PIp TrI-Pocm Quorter-ale 89 wingspan 42 Sq Ft detajied dans $1699 PP nd $100 self addressed stomped envelope detoiled list Built-Up R/C Models 50% Sole Hobby Capitol 46 N Oak St Ventura CA 93001 Phone 805 643-7616 642-8465 cake Landings require little care prevent tip stall still very slow generous wing area would recommend drag nose high however Super docile land ings could achieved some sacrifice snapping capability blunting wing leading edge toward tip can play its performance potential starting forward CG slowly moving back improve snapping roll characteristics used fairly aft CG location get very best performance snaps rolls also worked bit wing incidence engine thrust line zero-zero set up works well little bit engine right thrust ease torque effects Speaking torque Webra 91 pulls aircraft along ease using 14-6 7 prop used non-stock 60-size Perry pump carburetor Webra since will turn 10500 11000 carb prop choice becomes critical Vertical performance first thing suffer engine prop mismatched large high-drag airplanes like recommend very stiff torque pushrods throughout since control loads high will want use husky servos extremely tight centering resolution have found big ships rapid pot wear occurs servos tight due control loads increased control surface dither Fortunately will find large slow aircraft tolerant control dead-band high-speed pattern ships Im sure will especially appreciate very tight looping cornering capability Zlin large wing low wing loading will give spectacularly tight square loops Rolling maneuvers will require little work standard pattern ship due reduced airspeed smaller power loading somewhat shortcoupled design Youll find other large slower aircraft require increased proficiency rudder part pilot really feel will enjoy flying Zlin because combines realistic good looks fine aerobatic performance What could modeler ask Trans America Riches continued page 24 necessary know would no flying Wednesday made two Wed nesdays row After awards presentation motel Meridian team first 3 minutes ahead number 2 Montgomery team officials off Jackson MS start next leg high winds bothering Riches pick up worse Saggin Wagon AMA motorhome Bob Roach drove bad left rear spring causing perpetual lean hence Saggin Wagon weather clearing Jackson reports pretty good next morning didnt help Jimmy Grier tonight Three team members airplanes still Chicago Jerry Nelson have Jackson already planes Hurricane Frederick delayed slightly would early next morning Doc Edwards Jimmy takeoff area early rest Team 3 BTHOOM Team wasnt Jimmys Cessna somewhere between Chicago Jackson didnt look good though up until around 2 am fixing Docs truck pilot vehicle borrowed lead vehicle didnt look BTHOOM team going make alone ask what BTHOOM team Jimmy Grier asked what name team replied after slight delay Beats Hell Out other four teams off away frontage road takeoff area still no planes Jimmys team no rest team did arrive frantic rush get ready air being taped TV crew arrived late teams ran close part leg passing other pit stops teams good times team work payed off though three planes crashed Everyone ready takeoff West Monroe LA mayor hand see planes off police help teams get through traffic lights onto freeway fire department added nice touch hot coffee everyone Bob Roach much happier now wife Sue joined him Jackson would take care selling chances Pitts Special souvenirs rest trip As usual days flights uneventful Murphys Law again teams close coming Sharks field Bossier City LA Shreveport club big recep tion barbecue ready police escort freeway field big help did cause some confusion Doc Edwards trying get lead vehicle ahead guide Team 3s pilot vehicle landing area police car raced past going other direction siren wailing lights flashing police car made abrupt U-turn Doc jammed brakes let pass As Doc watching pull alongside thought bought sure policeman leaned Out window big sweeping motion arm yelled Cmon lets make Doc told Doris little later lucky have coronary Team 5 Sharks Club team fittingly received champagne first team top honors leg Shreveport John Embry AMA VP District VIII Ba Kinch Lake Charles club joined race CDs volunteered fill last minute vacancies leg Bo continue Abilene TX help out flight Shreveport Dallas long makes pit stops possible trouble Out five started Kellys Truck Stop morning four made no normal number problems broken props bent landing gears deadstick landings lost hatches crash two addition morning briefings Dont wear race hats back pilot vehicles tying Because no going lose valuable time retrieving race route well marked lost blue-and-white hats flight Mesquite Model Field Ft Worth uneventful five planes made short flight about 50 miles good time high point takeoff Mesquite reading proclamation mayor Dallas AMA past president Johnny Clemens along mayor pro tem Mesquite gave planes good send off landing Tarrant County Junior College landing area Fort Worth Jim Simpsons Southwest Modelers RC Club team least number problems took first place hardware three half minutes ahead John Kikers NASA Flyers Houston takeoff Ft Worth Wednesday 106 Model Aviation
Edition: Model Aviation - 1980/02
Page Numbers: 10, 11, 12, 13, 14, 15, 16, 17, 102, 104, 106
NO OCR TEXT NO OCR TEXT I SCENT I- I CSKCBc-CO lICK I I, ROCK-~c Alliii II JfpgTiC rI ICSONOOK PSFT IllsP5060110 0* FROB 106F0OOSKICK 0300 3~CO NKKKCOAIE01ItQS3i l&LCMCOCOBCCSOKSAL FIN SINK OKOCCISO ICSO0 PLOICSPLO0-00' r OCIKOO3KL573 OC OKKOKII OOEKLOCOSIK I..KOONlFS2PLO ICC SOUK 04013 pOKOOmI 40530 TMOSOKKL Naturally enough Don felt should seek aircraft similar layout Phoenix Zlin 526 726 series offered variety designs somewhat like Phoenix low-wing long-tail moment vehicles slightly swept wings Just finding full-scale aerobatic bird lines along success ful model design going enough however arrive winning design totally new event purpose avoid model flying characteristics stress scale realism decided go large light Large add realism presentation ease attitude recognition pilot judge Also large add drag slower flight again realism also help keep airplane 1200 box maneuvers performed Light weight considered essential vertical performance minimizing wing loading would allow sharp square comers flaps Another advantage light weight aerobatic aircraft Seen rear color-scheme lines emphasize feeling forward motion tenna strung stabilizer tip 12 Model Aviation Well-executed nose cowling really mean much Details ot tibergiass cowi snow up we. shotnote handling 4.m asn4 tho *sonInn Mir nnnnmnfl Just another picture provide another eyeview sne color scneme 11101 IS unarime Brown no Ice Mnlc fInuthrnusnl mumfflsr FULL SIZE PLANS AVAILABLE SEE PAGE 128 AICASONS LOAPJC/KAILWAASE7$5/SKOAKL PSOAOPCO oocsocxPSCMSATSSIALCCT n5/NACENT SAC III I S/SFLAT TOP SSAOSOLrCI S/A ISOCK 50 P55COMAI/ASPASTAPESS ACAS STACK SPACES/L/5S/SEALKM /LOS OP S/TA SCT P575555 ALLSACA SOOT ASK CT1 COT SACS/SBEAPtATPS SANK STACK1-U ACTAC PAN SCAM MASKS SAS TON ONE COLT AK/Sot5Ao5~OS MONET - X SET *I-2PM51 SAra S/lA SONTAIIfiAAA1AM NE iS/IA CSIAL-0515451C jF 05/IS ACAECttP tIZVCN II /S/ AGEMACAT POAS COATCCCNACCS~ SACASOC OCITSJ PANEL/Cl PS SIS/INOS ICS1/AMALSOp55 PCS 5/5505/SPM/CPBS MELLC PA ACCOLH OAMCS~ SOMI I/A SNUASO I I/S PCCI/A CCC Ii~2F /6II-I/-6-/vII//OSSOASK ACOOCENLACACICS OPI X KOCCOAOKkC /0 POSECCOK NOES _____________________________________________ III ThI jO fli AI EL PM II/A A/ALE MOCCA MO/NTCUT FRAN/NPUSECSOE ASKS IK SESOLOSCEKTSICK/AC PLO 00/MAPS/NO SOEKC IT IPASACNRO lASS PEAPSACALPSKLTION 00 I/S MACSMPTACONPSO7T- NOKOSjS/AC SOAPS rIIU/SSSOAAK~~ I/AS/C/ASS0I U[I II pIFS / H0500050/SC C/SPATS NOCCIOMA010 1/SOPLO1/ [ CUCTACAC 5/ASCOEC I I/N So/SECSET KACM/SF jMgj0I/SPLO5~ ISN-IS I/SNCUOSE] NLAOS CANE II / MOSPANI I/SN/C/COCKI/SM/AIOiMSj-ACOAS ~CUASE S SUNKCUT PACM I/S N/SECI II/MM/TO/CNL ASK CANOPY SE/CP1no 0550 CASASSICTS N/ASS/SN I CKASNKSO PLACE ----S often overlooked reduction inertia property also opposes cessation characteristics exactly what dont want angular moments inertia rotation airplane already rotating event precision point rolls snap An angular moment inertia mass property other words airplane high angular rolls required 3T maneuvers aircraft oppotes its rotation about moment inertia roll hard start rolling keeping structural weight absolute either its yaw pitch roll axis same difficult stop rolling once starts minimum could reduce moments February 1980 13 I I unsandL A/SSBCONAC /SSASSAC US SEA resmivemy simpie details complete tail detaches two separate pieces SACS ISS/odS 555 SES/Sy uc aeparaoeo orom inc stanhlizer reattached fuselage dowel two screws Facilitates transport i ysHIToo rU L 5QUARE RETRACT BEAM OUT TO BLOCS PLODD 5H0W 0 Up d\m ALTERNATE WING CONSTRUCTiON IS 3/3Z BALSA RIBS WITH SAME SPARS LEADING TRAILING EDGES 3/32 SHEET FRONT CECKING AEROCOMPOSITE CANOPY RUDDER & ELEVAlOR NYRODS TO SERVOS 3/8 BALSAN MIDDLE FAIRLEAD 6CKTO TAlL FOUR NO 2 SCREWS SECURE COWLING TO FUSELAGE I/8PIWJOD GUSSETS lOP AND BOTTOM WEBRA 91 ENGINE 2 3/4DIA- SPINNER AEROCOMPOSITES COWLING SCALE TO FIT 1/2 MAPLE ENGINE MOUNT . RECHESlOF-2 2 1/32 PLYWOOD FUSELAGE DOUBLER FROM F-I BELLY N IS CEMENTED 10 BOlTOM OF WING FIRST -24 SCREWS TO SECURE WING THRU 5/8 DOWELS 3A6 DOWELS IMBED INlO FOAM TO ANCHOR L G I/4 PLYVOD PLATFORM FOAM CORE IN RUDDER AND FIN II/4X3/4TE /16 PLYWXfl BOX3/16 X 1/4 FIN POSTI ENCASES STABILIZER1/16 SHEETING 5A6 DOWELS LOCKBALSA RUDDER FOST 1N TO FUSELAGE 3 /8 SQTOP ANDALL SCREWS HERE 3011DM FAIRLEAD 5/ 1600 WELFOR HORN 4-40 SCREWS MOUNT FIN BASETO BOX 4 BALSA DORSAL FOAM CORES / // WS I\~IssFiNPOST /GOLDBERG1/4 X 1/2 BALSA STABLIZER LE 5/16 DOWEL- 3/32 HOLE FOR HORN 1 1/2 DIA TAILWHEEL 1/4 SQ DIAGONALS 1/8 BALSA SIDE RINELS F-I 10 TAL3/16u X 3/8 BOTTOM KEEL V4SQ BOTTOM LONGERONS 10-24 REAR WING HOLD SCREVJS ThRJ 5/8DOWELS 1/8 MUSIC WIRE TOI/I& SHEET BALSATOP AND BOTfOM AILERON SERVOSV16 X 1/4 CAP STRIPS OVER FOAM 1 1/2 TRAILING EDGE STOCK DOUBLED FOR AILERONS 2 RETRACTABLE BELLCRANK ON 1/8 PLYWOOD PLATFOFA 1/4 X BALSA LEADING EDGEHOLLOWED BALSA BLOCK 3DIA MAIN WHEELS SOUTHERN RETRACT SYSTEM FROM SERVO POWER ONLY February 1980 15 1/4 HARD BALSA SPAR FRONT AND REAR TOP AND BCIlTCM inertia insure crisp totally controllable rotations aircraft about its axes finally settled Zlin 526 AS basis project 526 AS singleplace aerobatic low wing faired-in canopy in-line engine wing fairly high aspect ratio implies good roll damping leading edge swept straight trailing edge resulting wing sweep about 4 degrees Thrust line wing horizontal tail separated vertically very much usually means control coupling less likely Vertical tail size large enough scale directly horizontal tail size increased span chord maximum allowable 15% scale engine cowl allowed very neat inverted instal lation Webra 91 chosen power Finally retractable landing gear real aircraft allowed us include feature model well course airplane can improved made some subtle changes within rules hopes achieving model would fly con siderably better true scale replica Sym metrical airfoils substituted wing shortened its aspect ratio reduced widening tip chord wing also moved forward inch lengthen tail moment improve balance thrust line horizontal tail lowered wing raised slightly order bring surfaces nearly line thrust vector width fuselage reduced 15% canopy moved forward inch help knifeedge flight Strip ailerons substituted full-size aircrafts conventional ones horizontal tail increased chord span improve tail volume coefficient other aspects aircraft true scale very close including fuselage cross section aircraft sized 950 sq well over minimum quite bit smaller some other airplanes turned up Vegas weight goal set 9 pounds achieved would result excellent vertical per formance Webra 91 first version built-up wing vertical fin second 526 AS built Steve Rojecki foam wing cut out resemble rib structure added balsa spars sheeting wound up open framework foam wing closely resembling built-up version Both airplanes MonoKote Solar Film covered Epoxypainted fiberglass cowls custom molded canopies added complete vehicles both weighed 8 pounds ready fly minus fuel Initial flights both aircraft very encour aging obvious efforts achieve low angular inertia minimum weight paid off Square corners sharp clean precise starting stopping rolling maneuvers successfullly accomplished airplane fast highly desirable quality flying nearly constant speed high drag large airframe slowed down dives engine pulled vertically little sag due its low 16 Model Aviation Aft fuselage detail showing dowel holes screws attaching tail section Rudder pushrod attaches internally tail-wheel arm steering Larger size models permit flexibility structural design Underside detachable tail Three large holes pruvue eiuu tu ue screws attach fin stabilizer Two holes rear screws attach entire unit fuselage Using Southern RC retractswith Fox wheelsgear swings aft rather sideways duplicate retractable function real craft Servo installation wing aileron servo rear retract servo forward Bands hold screws place fuselage equipment bay dwarfs servo tray receiver forward batteries located under servo tray Note pushrods aluminum tubing weight reliability inside outside snapping maneuvers improved moving center gravity back its current location shown plans snaps also enhanced wing itself airfoil gets thinner toward tip leading edge sharpens outboard Both airplanes flown 1978 Tourn ament Champions new Prototype Pattern original built author flown 14th place finish Don Lowe other built Steve Rojecki flown Steve capacity pattern demonstration flier Steve competitor flew full pattern before judges during training beginning round official flying idea establish base flight judges rather have react differently first few flights round Steve probably got assignment proven flying abilities also because rare individual invited competitor did have qualified airplane event As case new events rules Vegas Prototype Pattern provisional subject change improvement based success first event rules changed 1980 Zlin 526 AS pre sented no longer eligible Vegas too small now minimum size mono plane has increased 1100 sq since Vegas invitational event limited about 25 select competitors unlikely would have built purpose Zlin 526 AS remains attractive model stand-off scale events 60 91 offers exciting bonus full aerobatic capability Construction Its always best tackle toughest building chore first. Normally means wing case fuselage rates first attention fuselage complicated its simulation real airplanes fabric covered longeron structure its provisions removable tail section tail separates fuselage make transporting airplane easier vertical fin may attached fuselage horizontal installed some reason wanted transport fuselage intact elevator halves sticking out happen have ample vehicle like van station wagon dont plan ship airplane Nevada year recom mend build permanent fixed tail surfaces reduces complexity saves weight eliminating lot plywood get started fuselage bulkheads Fl F2 two motor mounts 1/4 sq cross brace 1/16 floor between bulkheads Fl F2 assembled unit using slow setting epoxy Bulkheads F3 through F7 built up sa overlapping corner joints Add doublers join fuselage halves bulkheads F3 through F7 fuselage upside down flat building board aligned top view plans Add bulkheads F8 F9 after removing fuse lage board Before adding forward bulkhead unit epoxy aware fuselage sides will form hour glass top view unit added looks strange requires some good clamping possibly wet ting sides accomplish required order fair longeron-type aft fuselage struc ture smooth-sided nose structure Editors Note consider Zlin super aircraft skilled pilot wants something bit d/ferent special both personaiship heflies andfor highly realistic maneuvers can perform ft took little doing bring together Don Lowe Phoenix Marks given dashing off magazine projects developed design worked out Ken Don pooled wits ship built Ken pilot Lowe last saw Ken fly 1966 meet da4 Vince afellowRC oldtimer sur prised high level workmanship excellent writing long articleand would kits have such fine instructions Weve eliminate another article issue avoid diluting Kens copy top off Don Lowe did climactic commentay based upon piloting experiences basic fuselage box completed upper lower partial bulkheads added Next install 1/4 sq diagonal braces bottom fuselage add sq longerons point sq longerons top bottom edges fuselage sides glued place Fuselage top sheeting installed six pieces Two pieces 1/16 form turtledeck Four pieces 3/32 form top sheeting forward canopy Cross grain ting installed cockpit floor bottom nose after gas tank has installed Note Fuelproof entire gas tank compartment coat epoxy Add four pieces /4 balsa sheet two tail two above wing leading edge help fair longerons tailpost nose Cut wing saddles sheet glue fuselage Add ongerons fuselage sides epoxy plywood gussets strengthen motor mounts Before gluing om sheeting between F8 F9 tail wheel mount bolted F8 Also incorporating detachable tail ood plate should installed aft F9 back fuselage should faced 1/16 plywood flat surface removable tail sits covered 1/16 ply center has cut out aft section fuselage sanded such flat panels Monokote result covered flat upper enter ext center ower ower sq ower longeron finally / sq longeron middle 3/16 om central longeron t back fuselage beveled tapered fair sq longerons back tailpost t above wing leading edge faired sq wing saddle its rear edge feathered fuselage side its forward edge saddle sanded k its aft end about 3/16 thick its forward Continued page 102 February 1980 17 jetacnanie tail aetall shown align ment dowels parting line between vertical fin horizontal tail Ken Bonnema displays bottom ship can admire its color schemebit wild what Looking Better Silicone Tubing LUE LINE Its Thicker Stronger Highly Heat Resis tant Flexible other fuel lines Whats moreBLUE LINE eith er equal lower price others So dont fooled Remember ask original BLUE LINE tubing Send SASE today free catalog fine products El O7kENZ2 44W Prospect St New Haven Conn 06515 PRODUCTS safety radio control flying club needs some system aasure two transmitters same frequency notturnedon same time An orderly system does much avoid looks panic shouting flight lineor worse Generation Products producing com plete set engraved high quality frequency pins club use pins check hoard flight line moments panic can avoided frequency pins made high quality engravers plastic sandwich-like con struction numbers engraved cutting through top layer plastic thereby exposing second layer No paint used no fading wearing away numbers pin contains frequency number also color-codedtO match theflags transmitter Construction pins first rate set should stand up club use considerable time period product review product review product review ZIin/ Bonnema continued page 1 7 edge meets t al fin sanded Monokoted glued after rest fuselage has Monokoted Epoxy wing hold-downs drill yet Wing plans show foam wing mainly cause much simpler build no weight penalty occurred between Rojeckis foam wing built up version original wing half should cut lb/cu ft density foam block least 5 inches thick blocks faced foam wire cutter insure square Align root tip templates block absolutely no twist include dihedral raising centerline tip rib 070 inches above centerline root rib Locate root rib exact same place both blocks wing halves may joined blocks flat surface later Cut out core including spar notches using hot-wire bow Number rib templates before hand equal chord percentage segments hot wire may drawn past identical chord stations times both root tip templates After cores have cut blocks cut Out two templates cardboard thin plywood cutouts cores Place cores back blocks sandwich together place template side cut open areas push piece 1/16 music wire through spaces cut out Slip center-drilled piece l rod over end wire attach current regulated hot leads outside dowels Holding new hot wire wooden dowels run around inside templates thus cutting out area removed Repeat procedure cutout area Tapered spars cut very hard a glued cores Titebond epoxy Keep cores blocks weighted flat surface spars dry Next cut out landing gear unit clearance wheel wells servo boxes linkage channels copper wire forms placed heavy duty soldering gun Epoxy landing gear mounting plates 4-40 blind nuts already installed plates have four 3/16 dowels pro truding down foam extra gluing area added strength Glue bellcrank mounts install bellcranks landing gear linkage Sheet center section leading edge trailing edge 1/16 balsa sheet Slow setting epoxy sparingly applied balsa recommended Spreading epoxy foam does improve bond does add considerable weight Again set cores back blocks weight flat surface sheeting drying After sheeting dry trim excess sand flush foam Add tip blocks 3/16 trailing edge ing edge cap strips Remove sheeting has covered wheel well landing gear cavity Join wing halves flat surface epoxing center section both halves resting foam blocks Weight allow adequate time epoxy set up Ailerons laminated two pieces 1 trailing edge stock glued together longest surface longest surface leading edge bevel get quite enough must sanded allow sufficient aileron throw dowel drilled embedded aileron near root aileron horns essential An experiment 3/32 wire resulted aileron flutter fixed portion wing trailing edge lying between two ailerons laminated balsa sheet Clearance notched front piece Install aileron horn wires brass nylon guides before gluing central trailing edge section Drill holes clear through wing epoxy four ls have drilled through 3/16 wing bolts Sand flush upper lower surfaces wing reinforce wing center section wrap first layer 7-oz fiberglass cloth layer 2oz cloth Drill through hardened fiberglass open wing bolt holes Set wing fuselage align very carefully Run long 3/16 drill through bolt holes already wing drill through plywood wing mounting plates fuselage Remove wing enlarge holes fuselage plates install 10-24 blind nuts Bolt wing fuselage build up belly pan aligns perfectly fuselage Use paper tubes bolt guides through belly pan Cut away fiberglass balsa sheet covering servo box install rails aileron retract servos Rib spacing built up wing shown plans Using tip root templates provided sandwich 15 pieces 3/32 baisa between templates sand stack down form ribs wing half Spar location size un changed foam wing Leading edge trailing edge sheeting cap strips also un changed 1/16 balsa vertical grain spar webbing glued between ribs both front rear spars landing gear mount system shown can used ribs either side must reinforced plywood Wheel wells must built up 1/16 balsa sheet Ailerons tips center section including fiberglass reinforcement unchanged Tail Surfaces Foam cores vertical fin rudder stabilizer elevator cut using templates provided 1 / 16 sheeting epoxied wing surfaces left dry weighted foam blocks flat table Leading trailing edges tip blocks glued after sheeting has trimmed sanded Note 3/16 vertiial fin trailing edge exception glued foam core before sheeting sheeting overlaps Elevators rudder have l installed drilled 3/32 wire control horn joined stabilizer halves wrapped fiberglass cloth shown plans fol lowing steps must adhered 102 Model Aviation Available im 5 sizes fit appli cation about 59 per ft Shown above SUPER BLUE set upwith extra-large tubing 4 reusable ties & end-of-line nozzles $369 per pkg nrnrIiut review nrnduat review nrnduat review Frequency Pins @ $2500/ set Generation Pro ducts Co. Inc. 5512 Southwood Little Rock AR 72205 incorporating removable tail Spot glue mating piece 1/16 ply top plywood tail mounting surface fuselage upper piece should about shorter fuselage piece front edge piece glue another piece 1/16 ply matches upper middle quarter F8 including two 3/16 dowel holes Insert two 3/16 dowels through holes glue plywood floor glue dowels F8 back edge plywood floor glue F9A balsa Glue a lower saddles stabilizer Align stabilizer carefully glue saddles Glue a upper stabilizer saddles cap top saddles 1/16 plywood should now have box structure completely surrounding stabilizer plywood bottom top front balsa back break fuselage yet Spot glue another piece 1/16 plywood top box structure front edge piece glue piece plywood matches uppermost portion F8 including 3/16 dowel hole Also glue two blocks ood top plywood floor shown plans Drill 4-40 clearance hole through center front block clear through stabilizer box Drill two 4-40 clearance holes through rear block again clear through stabilizer box Enlarge three holes ply blocks install 4-40 blind nuts Insert piece 3/16 dowel through its hole glue plywood floor glue dowel F8 Now spot glue piece ood original 1/16 plywood tail mounting surface half-inch space left open behind stabilizer box k should fill entire space should 1/16 short width both sides Drill two 4-40 clearance holes through block through corresponding block fuselage underneath Enlarge holes upper block install two 4-40 blind nuts Now glue piece 1/16 plywood matches back face stabilizer box ood piece just installed 1/16 plywood floor spot glued top stabilizer box glue piece stabilizer box Now take sheeted vertical fin its extended hinge line post cut clearance bottom two plywood blind nut blocks 3/16 dowel mounted upper plywood floor Trim rudder post just contacts plywood blind nut block behind stabilizer box trim vertical fin sheeting fits over outside edges plywood block lines up fueslage sides Glue vertical fin upper plywood floor plywood pieces behind stabilizer box careful glue vertical fin assembly stabilizer box Glue sandtwo balsa blocks fair vertical fin F8 Finally add a dorsal fin assembly dry separate vertical fin assembly fuselage stabilizer box using razor blade break spot glue joints separate stabilizer box fuselage same way Enlarge three holes stabilizer box its lower side holes should opened up lower plywood floor stablizer itself enlarge holes upper plywood cap Glue paper straws act screw guides Now can sit back relax curse yourself building fixed tall fix tail surfaces simply eliminate plywood pieces enlarge balsa pieces accordingly glue everything together permanently Finishing Monokote Solar Film strongly recommended materials closely simulate fabric covering full-scale airplane offer lightest overall weight complete finish fiberglass engine cowl molded cellu lose acetate canopy available Aero composites Corp 411 Townsend Place Dayton 0hio4543 1 cowl frameworkmolded canopy painted match Mono kote colors used paint scheme OK WKE represents Czechoslovakian Team colors other airplane shown done British Aerobatic Team colors Since countries fly Zlin large variety color scheme options choose Installation Radio installation fairly straight forward use 60 stow flight pack battery above gas tank 91 locate battery above servo tray further aft necessary achieve proper CG receiver foam wrapped sits fuselage bay just front servo tray Aileron retract linkage shown drawings plans show independent control horns elevator half require pushrod exits rear fuselage both sides M alternative elevator halves may joined central horn single pushrod concealed fuselage rudder pushrod may attached internally tail wheel steering arm before exits fuselage side its way back rudder Flying 526 AS Zlin designed high-performance machine capable perform ing AMA FAI Vegas Tournament maneuvers Flying aircraft pure pleasure difficult considering its very high performance potential Takeoffs piece 104 Model Aviation Please send mecopies new 5th edition Radio Control Buyers Guide Enclosed $825 copy ordered $725 retail plus $100 postage & handling City State ZIP Return RC Buyers Guide Clifton House Clifton VA 22024 Purchasing R/C Aircraft easy YOUNIQUE AT Hobby Capitol keep large ready supply Custom-But RC Aircraft Kits Engines RC Units times And. thanks years experience dealing people sections US. prepare special one-of-a-kind RC Aircraft special one-ofa-kind RC flyer demands unique look express tastes Chances youll find custom paint finish exquisite detailed cockpit interiors glassed engine compartments real scale wheels custom grilled nose section will knock socks offi l probably never see another like cause Hobby Capitol expert stressed preparation goes far beyond standard checkout RC shoppers turning up increasing numbers convenient showroom because word out. outstanding buys service finest selection unique RC Aircraft anywhere its HOBBY CAPITOL Old Ignition Trade-in Buy sell old time ignition engines Box up what yau have send us honest appraisal could worth new proportional set have engines can also start collection welcome built-up airplanes used proportionals old time ignition engines Come trade us Top dollar Custom-1311t-RjC Built Order Plans Ft stock choose Its s40000 PIp TrI-Pocm Quorter-ale 89 wingspan 42 Sq Ft detajied dans $1699 PP nd $100 self addressed stomped envelope detoiled list Built-Up R/C Models 50% Sole Hobby Capitol 46 N Oak St Ventura CA 93001 Phone 805 643-7616 642-8465 cake Landings require little care prevent tip stall still very slow generous wing area would recommend drag nose high however Super docile land ings could achieved some sacrifice snapping capability blunting wing leading edge toward tip can play its performance potential starting forward CG slowly moving back improve snapping roll characteristics used fairly aft CG location get very best performance snaps rolls also worked bit wing incidence engine thrust line zero-zero set up works well little bit engine right thrust ease torque effects Speaking torque Webra 91 pulls aircraft along ease using 14-6 7 prop used non-stock 60-size Perry pump carburetor Webra since will turn 10500 11000 carb prop choice becomes critical Vertical performance first thing suffer engine prop mismatched large high-drag airplanes like recommend very stiff torque pushrods throughout since control loads high will want use husky servos extremely tight centering resolution have found big ships rapid pot wear occurs servos tight due control loads increased control surface dither Fortunately will find large slow aircraft tolerant control dead-band high-speed pattern ships Im sure will especially appreciate very tight looping cornering capability Zlin large wing low wing loading will give spectacularly tight square loops Rolling maneuvers will require little work standard pattern ship due reduced airspeed smaller power loading somewhat shortcoupled design Youll find other large slower aircraft require increased proficiency rudder part pilot really feel will enjoy flying Zlin because combines realistic good looks fine aerobatic performance What could modeler ask Trans America Riches continued page 24 necessary know would no flying Wednesday made two Wed nesdays row After awards presentation motel Meridian team first 3 minutes ahead number 2 Montgomery team officials off Jackson MS start next leg high winds bothering Riches pick up worse Saggin Wagon AMA motorhome Bob Roach drove bad left rear spring causing perpetual lean hence Saggin Wagon weather clearing Jackson reports pretty good next morning didnt help Jimmy Grier tonight Three team members airplanes still Chicago Jerry Nelson have Jackson already planes Hurricane Frederick delayed slightly would early next morning Doc Edwards Jimmy takeoff area early rest Team 3 BTHOOM Team wasnt Jimmys Cessna somewhere between Chicago Jackson didnt look good though up until around 2 am fixing Docs truck pilot vehicle borrowed lead vehicle didnt look BTHOOM team going make alone ask what BTHOOM team Jimmy Grier asked what name team replied after slight delay Beats Hell Out other four teams off away frontage road takeoff area still no planes Jimmys team no rest team did arrive frantic rush get ready air being taped TV crew arrived late teams ran close part leg passing other pit stops teams good times team work payed off though three planes crashed Everyone ready takeoff West Monroe LA mayor hand see planes off police help teams get through traffic lights onto freeway fire department added nice touch hot coffee everyone Bob Roach much happier now wife Sue joined him Jackson would take care selling chances Pitts Special souvenirs rest trip As usual days flights uneventful Murphys Law again teams close coming Sharks field Bossier City LA Shreveport club big recep tion barbecue ready police escort freeway field big help did cause some confusion Doc Edwards trying get lead vehicle ahead guide Team 3s pilot vehicle landing area police car raced past going other direction siren wailing lights flashing police car made abrupt U-turn Doc jammed brakes let pass As Doc watching pull alongside thought bought sure policeman leaned Out window big sweeping motion arm yelled Cmon lets make Doc told Doris little later lucky have coronary Team 5 Sharks Club team fittingly received champagne first team top honors leg Shreveport John Embry AMA VP District VIII Ba Kinch Lake Charles club joined race CDs volunteered fill last minute vacancies leg Bo continue Abilene TX help out flight Shreveport Dallas long makes pit stops possible trouble Out five started Kellys Truck Stop morning four made no normal number problems broken props bent landing gears deadstick landings lost hatches crash two addition morning briefings Dont wear race hats back pilot vehicles tying Because no going lose valuable time retrieving race route well marked lost blue-and-white hats flight Mesquite Model Field Ft Worth uneventful five planes made short flight about 50 miles good time high point takeoff Mesquite reading proclamation mayor Dallas AMA past president Johnny Clemens along mayor pro tem Mesquite gave planes good send off landing Tarrant County Junior College landing area Fort Worth Jim Simpsons Southwest Modelers RC Club team least number problems took first place hardware three half minutes ahead John Kikers NASA Flyers Houston takeoff Ft Worth Wednesday 106 Model Aviation
Edition: Model Aviation - 1980/02
Page Numbers: 10, 11, 12, 13, 14, 15, 16, 17, 102, 104, 106
NO OCR TEXT NO OCR TEXT I SCENT I- I CSKCBc-CO lICK I I, ROCK-~c Alliii II JfpgTiC rI ICSONOOK PSFT IllsP5060110 0* FROB 106F0OOSKICK 0300 3~CO NKKKCOAIE01ItQS3i l&LCMCOCOBCCSOKSAL FIN SINK OKOCCISO ICSO0 PLOICSPLO0-00' r OCIKOO3KL573 OC OKKOKII OOEKLOCOSIK I..KOONlFS2PLO ICC SOUK 04013 pOKOOmI 40530 TMOSOKKL Naturally enough Don felt should seek aircraft similar layout Phoenix Zlin 526 726 series offered variety designs somewhat like Phoenix low-wing long-tail moment vehicles slightly swept wings Just finding full-scale aerobatic bird lines along success ful model design going enough however arrive winning design totally new event purpose avoid model flying characteristics stress scale realism decided go large light Large add realism presentation ease attitude recognition pilot judge Also large add drag slower flight again realism also help keep airplane 1200 box maneuvers performed Light weight considered essential vertical performance minimizing wing loading would allow sharp square comers flaps Another advantage light weight aerobatic aircraft Seen rear color-scheme lines emphasize feeling forward motion tenna strung stabilizer tip 12 Model Aviation Well-executed nose cowling really mean much Details ot tibergiass cowi snow up we. shotnote handling 4.m asn4 tho *sonInn Mir nnnnmnfl Just another picture provide another eyeview sne color scneme 11101 IS unarime Brown no Ice Mnlc fInuthrnusnl mumfflsr FULL SIZE PLANS AVAILABLE SEE PAGE 128 AICASONS LOAPJC/KAILWAASE7$5/SKOAKL PSOAOPCO oocsocxPSCMSATSSIALCCT n5/NACENT SAC III I S/SFLAT TOP SSAOSOLrCI S/A ISOCK 50 P55COMAI/ASPASTAPESS ACAS STACK SPACES/L/5S/SEALKM /LOS OP S/TA SCT P575555 ALLSACA SOOT ASK CT1 COT SACS/SBEAPtATPS SANK STACK1-U ACTAC PAN SCAM MASKS SAS TON ONE COLT AK/Sot5Ao5~OS MONET - X SET *I-2PM51 SAra S/lA SONTAIIfiAAA1AM NE iS/IA CSIAL-0515451C jF 05/IS ACAECttP tIZVCN II /S/ AGEMACAT POAS COATCCCNACCS~ SACASOC OCITSJ PANEL/Cl PS SIS/INOS ICS1/AMALSOp55 PCS 5/5505/SPM/CPBS MELLC PA ACCOLH OAMCS~ SOMI I/A SNUASO I I/S PCCI/A CCC Ii~2F /6II-I/-6-/vII//OSSOASK ACOOCENLACACICS OPI X KOCCOAOKkC /0 POSECCOK NOES _____________________________________________ III ThI jO fli AI EL PM II/A A/ALE MOCCA MO/NTCUT FRAN/NPUSECSOE ASKS IK SESOLOSCEKTSICK/AC PLO 00/MAPS/NO SOEKC IT IPASACNRO lASS PEAPSACALPSKLTION 00 I/S MACSMPTACONPSO7T- NOKOSjS/AC SOAPS rIIU/SSSOAAK~~ I/AS/C/ASS0I U[I II pIFS / H0500050/SC C/SPATS NOCCIOMA010 1/SOPLO1/ [ CUCTACAC 5/ASCOEC I I/N So/SECSET KACM/SF jMgj0I/SPLO5~ ISN-IS I/SNCUOSE] NLAOS CANE II / MOSPANI I/SN/C/COCKI/SM/AIOiMSj-ACOAS ~CUASE S SUNKCUT PACM I/S N/SECI II/MM/TO/CNL ASK CANOPY SE/CP1no 0550 CASASSICTS N/ASS/SN I CKASNKSO PLACE ----S often overlooked reduction inertia property also opposes cessation characteristics exactly what dont want angular moments inertia rotation airplane already rotating event precision point rolls snap An angular moment inertia mass property other words airplane high angular rolls required 3T maneuvers aircraft oppotes its rotation about moment inertia roll hard start rolling keeping structural weight absolute either its yaw pitch roll axis same difficult stop rolling once starts minimum could reduce moments February 1980 13 I I unsandL A/SSBCONAC /SSASSAC US SEA resmivemy simpie details complete tail detaches two separate pieces SACS ISS/odS 555 SES/Sy uc aeparaoeo orom inc stanhlizer reattached fuselage dowel two screws Facilitates transport i ysHIToo rU L 5QUARE RETRACT BEAM OUT TO BLOCS PLODD 5H0W 0 Up d\m ALTERNATE WING CONSTRUCTiON IS 3/3Z BALSA RIBS WITH SAME SPARS LEADING TRAILING EDGES 3/32 SHEET FRONT CECKING AEROCOMPOSITE CANOPY RUDDER & ELEVAlOR NYRODS TO SERVOS 3/8 BALSAN MIDDLE FAIRLEAD 6CKTO TAlL FOUR NO 2 SCREWS SECURE COWLING TO FUSELAGE I/8PIWJOD GUSSETS lOP AND BOTTOM WEBRA 91 ENGINE 2 3/4DIA- SPINNER AEROCOMPOSITES COWLING SCALE TO FIT 1/2 MAPLE ENGINE MOUNT . RECHESlOF-2 2 1/32 PLYWOOD FUSELAGE DOUBLER FROM F-I BELLY N IS CEMENTED 10 BOlTOM OF WING FIRST -24 SCREWS TO SECURE WING THRU 5/8 DOWELS 3A6 DOWELS IMBED INlO FOAM TO ANCHOR L G I/4 PLYVOD PLATFORM FOAM CORE IN RUDDER AND FIN II/4X3/4TE /16 PLYWXfl BOX3/16 X 1/4 FIN POSTI ENCASES STABILIZER1/16 SHEETING 5A6 DOWELS LOCKBALSA RUDDER FOST 1N TO FUSELAGE 3 /8 SQTOP ANDALL SCREWS HERE 3011DM FAIRLEAD 5/ 1600 WELFOR HORN 4-40 SCREWS MOUNT FIN BASETO BOX 4 BALSA DORSAL FOAM CORES / // WS I\~IssFiNPOST /GOLDBERG1/4 X 1/2 BALSA STABLIZER LE 5/16 DOWEL- 3/32 HOLE FOR HORN 1 1/2 DIA TAILWHEEL 1/4 SQ DIAGONALS 1/8 BALSA SIDE RINELS F-I 10 TAL3/16u X 3/8 BOTTOM KEEL V4SQ BOTTOM LONGERONS 10-24 REAR WING HOLD SCREVJS ThRJ 5/8DOWELS 1/8 MUSIC WIRE TOI/I& SHEET BALSATOP AND BOTfOM AILERON SERVOSV16 X 1/4 CAP STRIPS OVER FOAM 1 1/2 TRAILING EDGE STOCK DOUBLED FOR AILERONS 2 RETRACTABLE BELLCRANK ON 1/8 PLYWOOD PLATFOFA 1/4 X BALSA LEADING EDGEHOLLOWED BALSA BLOCK 3DIA MAIN WHEELS SOUTHERN RETRACT SYSTEM FROM SERVO POWER ONLY February 1980 15 1/4 HARD BALSA SPAR FRONT AND REAR TOP AND BCIlTCM inertia insure crisp totally controllable rotations aircraft about its axes finally settled Zlin 526 AS basis project 526 AS singleplace aerobatic low wing faired-in canopy in-line engine wing fairly high aspect ratio implies good roll damping leading edge swept straight trailing edge resulting wing sweep about 4 degrees Thrust line wing horizontal tail separated vertically very much usually means control coupling less likely Vertical tail size large enough scale directly horizontal tail size increased span chord maximum allowable 15% scale engine cowl allowed very neat inverted instal lation Webra 91 chosen power Finally retractable landing gear real aircraft allowed us include feature model well course airplane can improved made some subtle changes within rules hopes achieving model would fly con siderably better true scale replica Sym metrical airfoils substituted wing shortened its aspect ratio reduced widening tip chord wing also moved forward inch lengthen tail moment improve balance thrust line horizontal tail lowered wing raised slightly order bring surfaces nearly line thrust vector width fuselage reduced 15% canopy moved forward inch help knifeedge flight Strip ailerons substituted full-size aircrafts conventional ones horizontal tail increased chord span improve tail volume coefficient other aspects aircraft true scale very close including fuselage cross section aircraft sized 950 sq well over minimum quite bit smaller some other airplanes turned up Vegas weight goal set 9 pounds achieved would result excellent vertical per formance Webra 91 first version built-up wing vertical fin second 526 AS built Steve Rojecki foam wing cut out resemble rib structure added balsa spars sheeting wound up open framework foam wing closely resembling built-up version Both airplanes MonoKote Solar Film covered Epoxypainted fiberglass cowls custom molded canopies added complete vehicles both weighed 8 pounds ready fly minus fuel Initial flights both aircraft very encour aging obvious efforts achieve low angular inertia minimum weight paid off Square corners sharp clean precise starting stopping rolling maneuvers successfullly accomplished airplane fast highly desirable quality flying nearly constant speed high drag large airframe slowed down dives engine pulled vertically little sag due its low 16 Model Aviation Aft fuselage detail showing dowel holes screws attaching tail section Rudder pushrod attaches internally tail-wheel arm steering Larger size models permit flexibility structural design Underside detachable tail Three large holes pruvue eiuu tu ue screws attach fin stabilizer Two holes rear screws attach entire unit fuselage Using Southern RC retractswith Fox wheelsgear swings aft rather sideways duplicate retractable function real craft Servo installation wing aileron servo rear retract servo forward Bands hold screws place fuselage equipment bay dwarfs servo tray receiver forward batteries located under servo tray Note pushrods aluminum tubing weight reliability inside outside snapping maneuvers improved moving center gravity back its current location shown plans snaps also enhanced wing itself airfoil gets thinner toward tip leading edge sharpens outboard Both airplanes flown 1978 Tourn ament Champions new Prototype Pattern original built author flown 14th place finish Don Lowe other built Steve Rojecki flown Steve capacity pattern demonstration flier Steve competitor flew full pattern before judges during training beginning round official flying idea establish base flight judges rather have react differently first few flights round Steve probably got assignment proven flying abilities also because rare individual invited competitor did have qualified airplane event As case new events rules Vegas Prototype Pattern provisional subject change improvement based success first event rules changed 1980 Zlin 526 AS pre sented no longer eligible Vegas too small now minimum size mono plane has increased 1100 sq since Vegas invitational event limited about 25 select competitors unlikely would have built purpose Zlin 526 AS remains attractive model stand-off scale events 60 91 offers exciting bonus full aerobatic capability Construction Its always best tackle toughest building chore first. Normally means wing case fuselage rates first attention fuselage complicated its simulation real airplanes fabric covered longeron structure its provisions removable tail section tail separates fuselage make transporting airplane easier vertical fin may attached fuselage horizontal installed some reason wanted transport fuselage intact elevator halves sticking out happen have ample vehicle like van station wagon dont plan ship airplane Nevada year recom mend build permanent fixed tail surfaces reduces complexity saves weight eliminating lot plywood get started fuselage bulkheads Fl F2 two motor mounts 1/4 sq cross brace 1/16 floor between bulkheads Fl F2 assembled unit using slow setting epoxy Bulkheads F3 through F7 built up sa overlapping corner joints Add doublers join fuselage halves bulkheads F3 through F7 fuselage upside down flat building board aligned top view plans Add bulkheads F8 F9 after removing fuse lage board Before adding forward bulkhead unit epoxy aware fuselage sides will form hour glass top view unit added looks strange requires some good clamping possibly wet ting sides accomplish required order fair longeron-type aft fuselage struc ture smooth-sided nose structure Editors Note consider Zlin super aircraft skilled pilot wants something bit d/ferent special both personaiship heflies andfor highly realistic maneuvers can perform ft took little doing bring together Don Lowe Phoenix Marks given dashing off magazine projects developed design worked out Ken Don pooled wits ship built Ken pilot Lowe last saw Ken fly 1966 meet da4 Vince afellowRC oldtimer sur prised high level workmanship excellent writing long articleand would kits have such fine instructions Weve eliminate another article issue avoid diluting Kens copy top off Don Lowe did climactic commentay based upon piloting experiences basic fuselage box completed upper lower partial bulkheads added Next install 1/4 sq diagonal braces bottom fuselage add sq longerons point sq longerons top bottom edges fuselage sides glued place Fuselage top sheeting installed six pieces Two pieces 1/16 form turtledeck Four pieces 3/32 form top sheeting forward canopy Cross grain ting installed cockpit floor bottom nose after gas tank has installed Note Fuelproof entire gas tank compartment coat epoxy Add four pieces /4 balsa sheet two tail two above wing leading edge help fair longerons tailpost nose Cut wing saddles sheet glue fuselage Add ongerons fuselage sides epoxy plywood gussets strengthen motor mounts Before gluing om sheeting between F8 F9 tail wheel mount bolted F8 Also incorporating detachable tail ood plate should installed aft F9 back fuselage should faced 1/16 plywood flat surface removable tail sits covered 1/16 ply center has cut out aft section fuselage sanded such flat panels Monokote result covered flat upper enter ext center ower ower sq ower longeron finally / sq longeron middle 3/16 om central longeron t back fuselage beveled tapered fair sq longerons back tailpost t above wing leading edge faired sq wing saddle its rear edge feathered fuselage side its forward edge saddle sanded k its aft end about 3/16 thick its forward Continued page 102 February 1980 17 jetacnanie tail aetall shown align ment dowels parting line between vertical fin horizontal tail Ken Bonnema displays bottom ship can admire its color schemebit wild what Looking Better Silicone Tubing LUE LINE Its Thicker Stronger Highly Heat Resis tant Flexible other fuel lines Whats moreBLUE LINE eith er equal lower price others So dont fooled Remember ask original BLUE LINE tubing Send SASE today free catalog fine products El O7kENZ2 44W Prospect St New Haven Conn 06515 PRODUCTS safety radio control flying club needs some system aasure two transmitters same frequency notturnedon same time An orderly system does much avoid looks panic shouting flight lineor worse Generation Products producing com plete set engraved high quality frequency pins club use pins check hoard flight line moments panic can avoided frequency pins made high quality engravers plastic sandwich-like con struction numbers engraved cutting through top layer plastic thereby exposing second layer No paint used no fading wearing away numbers pin contains frequency number also color-codedtO match theflags transmitter Construction pins first rate set should stand up club use considerable time period product review product review product review ZIin/ Bonnema continued page 1 7 edge meets t al fin sanded Monokoted glued after rest fuselage has Monokoted Epoxy wing hold-downs drill yet Wing plans show foam wing mainly cause much simpler build no weight penalty occurred between Rojeckis foam wing built up version original wing half should cut lb/cu ft density foam block least 5 inches thick blocks faced foam wire cutter insure square Align root tip templates block absolutely no twist include dihedral raising centerline tip rib 070 inches above centerline root rib Locate root rib exact same place both blocks wing halves may joined blocks flat surface later Cut out core including spar notches using hot-wire bow Number rib templates before hand equal chord percentage segments hot wire may drawn past identical chord stations times both root tip templates After cores have cut blocks cut Out two templates cardboard thin plywood cutouts cores Place cores back blocks sandwich together place template side cut open areas push piece 1/16 music wire through spaces cut out Slip center-drilled piece l rod over end wire attach current regulated hot leads outside dowels Holding new hot wire wooden dowels run around inside templates thus cutting out area removed Repeat procedure cutout area Tapered spars cut very hard a glued cores Titebond epoxy Keep cores blocks weighted flat surface spars dry Next cut out landing gear unit clearance wheel wells servo boxes linkage channels copper wire forms placed heavy duty soldering gun Epoxy landing gear mounting plates 4-40 blind nuts already installed plates have four 3/16 dowels pro truding down foam extra gluing area added strength Glue bellcrank mounts install bellcranks landing gear linkage Sheet center section leading edge trailing edge 1/16 balsa sheet Slow setting epoxy sparingly applied balsa recommended Spreading epoxy foam does improve bond does add considerable weight Again set cores back blocks weight flat surface sheeting drying After sheeting dry trim excess sand flush foam Add tip blocks 3/16 trailing edge ing edge cap strips Remove sheeting has covered wheel well landing gear cavity Join wing halves flat surface epoxing center section both halves resting foam blocks Weight allow adequate time epoxy set up Ailerons laminated two pieces 1 trailing edge stock glued together longest surface longest surface leading edge bevel get quite enough must sanded allow sufficient aileron throw dowel drilled embedded aileron near root aileron horns essential An experiment 3/32 wire resulted aileron flutter fixed portion wing trailing edge lying between two ailerons laminated balsa sheet Clearance notched front piece Install aileron horn wires brass nylon guides before gluing central trailing edge section Drill holes clear through wing epoxy four ls have drilled through 3/16 wing bolts Sand flush upper lower surfaces wing reinforce wing center section wrap first layer 7-oz fiberglass cloth layer 2oz cloth Drill through hardened fiberglass open wing bolt holes Set wing fuselage align very carefully Run long 3/16 drill through bolt holes already wing drill through plywood wing mounting plates fuselage Remove wing enlarge holes fuselage plates install 10-24 blind nuts Bolt wing fuselage build up belly pan aligns perfectly fuselage Use paper tubes bolt guides through belly pan Cut away fiberglass balsa sheet covering servo box install rails aileron retract servos Rib spacing built up wing shown plans Using tip root templates provided sandwich 15 pieces 3/32 baisa between templates sand stack down form ribs wing half Spar location size un changed foam wing Leading edge trailing edge sheeting cap strips also un changed 1/16 balsa vertical grain spar webbing glued between ribs both front rear spars landing gear mount system shown can used ribs either side must reinforced plywood Wheel wells must built up 1/16 balsa sheet Ailerons tips center section including fiberglass reinforcement unchanged Tail Surfaces Foam cores vertical fin rudder stabilizer elevator cut using templates provided 1 / 16 sheeting epoxied wing surfaces left dry weighted foam blocks flat table Leading trailing edges tip blocks glued after sheeting has trimmed sanded Note 3/16 vertiial fin trailing edge exception glued foam core before sheeting sheeting overlaps Elevators rudder have l installed drilled 3/32 wire control horn joined stabilizer halves wrapped fiberglass cloth shown plans fol lowing steps must adhered 102 Model Aviation Available im 5 sizes fit appli cation about 59 per ft Shown above SUPER BLUE set upwith extra-large tubing 4 reusable ties & end-of-line nozzles $369 per pkg nrnrIiut review nrnduat review nrnduat review Frequency Pins @ $2500/ set Generation Pro ducts Co. Inc. 5512 Southwood Little Rock AR 72205 incorporating removable tail Spot glue mating piece 1/16 ply top plywood tail mounting surface fuselage upper piece should about shorter fuselage piece front edge piece glue another piece 1/16 ply matches upper middle quarter F8 including two 3/16 dowel holes Insert two 3/16 dowels through holes glue plywood floor glue dowels F8 back edge plywood floor glue F9A balsa Glue a lower saddles stabilizer Align stabilizer carefully glue saddles Glue a upper stabilizer saddles cap top saddles 1/16 plywood should now have box structure completely surrounding stabilizer plywood bottom top front balsa back break fuselage yet Spot glue another piece 1/16 plywood top box structure front edge piece glue piece plywood matches uppermost portion F8 including 3/16 dowel hole Also glue two blocks ood top plywood floor shown plans Drill 4-40 clearance hole through center front block clear through stabilizer box Drill two 4-40 clearance holes through rear block again clear through stabilizer box Enlarge three holes ply blocks install 4-40 blind nuts Insert piece 3/16 dowel through its hole glue plywood floor glue dowel F8 Now spot glue piece ood original 1/16 plywood tail mounting surface half-inch space left open behind stabilizer box k should fill entire space should 1/16 short width both sides Drill two 4-40 clearance holes through block through corresponding block fuselage underneath Enlarge holes upper block install two 4-40 blind nuts Now glue piece 1/16 plywood matches back face stabilizer box ood piece just installed 1/16 plywood floor spot glued top stabilizer box glue piece stabilizer box Now take sheeted vertical fin its extended hinge line post cut clearance bottom two plywood blind nut blocks 3/16 dowel mounted upper plywood floor Trim rudder post just contacts plywood blind nut block behind stabilizer box trim vertical fin sheeting fits over outside edges plywood block lines up fueslage sides Glue vertical fin upper plywood floor plywood pieces behind stabilizer box careful glue vertical fin assembly stabilizer box Glue sandtwo balsa blocks fair vertical fin F8 Finally add a dorsal fin assembly dry separate vertical fin assembly fuselage stabilizer box using razor blade break spot glue joints separate stabilizer box fuselage same way Enlarge three holes stabilizer box its lower side holes should opened up lower plywood floor stablizer itself enlarge holes upper plywood cap Glue paper straws act screw guides Now can sit back relax curse yourself building fixed tall fix tail surfaces simply eliminate plywood pieces enlarge balsa pieces accordingly glue everything together permanently Finishing Monokote Solar Film strongly recommended materials closely simulate fabric covering full-scale airplane offer lightest overall weight complete finish fiberglass engine cowl molded cellu lose acetate canopy available Aero composites Corp 411 Townsend Place Dayton 0hio4543 1 cowl frameworkmolded canopy painted match Mono kote colors used paint scheme OK WKE represents Czechoslovakian Team colors other airplane shown done British Aerobatic Team colors Since countries fly Zlin large variety color scheme options choose Installation Radio installation fairly straight forward use 60 stow flight pack battery above gas tank 91 locate battery above servo tray further aft necessary achieve proper CG receiver foam wrapped sits fuselage bay just front servo tray Aileron retract linkage shown drawings plans show independent control horns elevator half require pushrod exits rear fuselage both sides M alternative elevator halves may joined central horn single pushrod concealed fuselage rudder pushrod may attached internally tail wheel steering arm before exits fuselage side its way back rudder Flying 526 AS Zlin designed high-performance machine capable perform ing AMA FAI Vegas Tournament maneuvers Flying aircraft pure pleasure difficult considering its very high performance potential Takeoffs piece 104 Model Aviation Please send mecopies new 5th edition Radio Control Buyers Guide Enclosed $825 copy ordered $725 retail plus $100 postage & handling City State ZIP Return RC Buyers Guide Clifton House Clifton VA 22024 Purchasing R/C Aircraft easy YOUNIQUE AT Hobby Capitol keep large ready supply Custom-But RC Aircraft Kits Engines RC Units times And. thanks years experience dealing people sections US. prepare special one-of-a-kind RC Aircraft special one-ofa-kind RC flyer demands unique look express tastes Chances youll find custom paint finish exquisite detailed cockpit interiors glassed engine compartments real scale wheels custom grilled nose section will knock socks offi l probably never see another like cause Hobby Capitol expert stressed preparation goes far beyond standard checkout RC shoppers turning up increasing numbers convenient showroom because word out. outstanding buys service finest selection unique RC Aircraft anywhere its HOBBY CAPITOL Old Ignition Trade-in Buy sell old time ignition engines Box up what yau have send us honest appraisal could worth new proportional set have engines can also start collection welcome built-up airplanes used proportionals old time ignition engines Come trade us Top dollar Custom-1311t-RjC Built Order Plans Ft stock choose Its s40000 PIp TrI-Pocm Quorter-ale 89 wingspan 42 Sq Ft detajied dans $1699 PP nd $100 self addressed stomped envelope detoiled list Built-Up R/C Models 50% Sole Hobby Capitol 46 N Oak St Ventura CA 93001 Phone 805 643-7616 642-8465 cake Landings require little care prevent tip stall still very slow generous wing area would recommend drag nose high however Super docile land ings could achieved some sacrifice snapping capability blunting wing leading edge toward tip can play its performance potential starting forward CG slowly moving back improve snapping roll characteristics used fairly aft CG location get very best performance snaps rolls also worked bit wing incidence engine thrust line zero-zero set up works well little bit engine right thrust ease torque effects Speaking torque Webra 91 pulls aircraft along ease using 14-6 7 prop used non-stock 60-size Perry pump carburetor Webra since will turn 10500 11000 carb prop choice becomes critical Vertical performance first thing suffer engine prop mismatched large high-drag airplanes like recommend very stiff torque pushrods throughout since control loads high will want use husky servos extremely tight centering resolution have found big ships rapid pot wear occurs servos tight due control loads increased control surface dither Fortunately will find large slow aircraft tolerant control dead-band high-speed pattern ships Im sure will especially appreciate very tight looping cornering capability Zlin large wing low wing loading will give spectacularly tight square loops Rolling maneuvers will require little work standard pattern ship due reduced airspeed smaller power loading somewhat shortcoupled design Youll find other large slower aircraft require increased proficiency rudder part pilot really feel will enjoy flying Zlin because combines realistic good looks fine aerobatic performance What could modeler ask Trans America Riches continued page 24 necessary know would no flying Wednesday made two Wed nesdays row After awards presentation motel Meridian team first 3 minutes ahead number 2 Montgomery team officials off Jackson MS start next leg high winds bothering Riches pick up worse Saggin Wagon AMA motorhome Bob Roach drove bad left rear spring causing perpetual lean hence Saggin Wagon weather clearing Jackson reports pretty good next morning didnt help Jimmy Grier tonight Three team members airplanes still Chicago Jerry Nelson have Jackson already planes Hurricane Frederick delayed slightly would early next morning Doc Edwards Jimmy takeoff area early rest Team 3 BTHOOM Team wasnt Jimmys Cessna somewhere between Chicago Jackson didnt look good though up until around 2 am fixing Docs truck pilot vehicle borrowed lead vehicle didnt look BTHOOM team going make alone ask what BTHOOM team Jimmy Grier asked what name team replied after slight delay Beats Hell Out other four teams off away frontage road takeoff area still no planes Jimmys team no rest team did arrive frantic rush get ready air being taped TV crew arrived late teams ran close part leg passing other pit stops teams good times team work payed off though three planes crashed Everyone ready takeoff West Monroe LA mayor hand see planes off police help teams get through traffic lights onto freeway fire department added nice touch hot coffee everyone Bob Roach much happier now wife Sue joined him Jackson would take care selling chances Pitts Special souvenirs rest trip As usual days flights uneventful Murphys Law again teams close coming Sharks field Bossier City LA Shreveport club big recep tion barbecue ready police escort freeway field big help did cause some confusion Doc Edwards trying get lead vehicle ahead guide Team 3s pilot vehicle landing area police car raced past going other direction siren wailing lights flashing police car made abrupt U-turn Doc jammed brakes let pass As Doc watching pull alongside thought bought sure policeman leaned Out window big sweeping motion arm yelled Cmon lets make Doc told Doris little later lucky have coronary Team 5 Sharks Club team fittingly received champagne first team top honors leg Shreveport John Embry AMA VP District VIII Ba Kinch Lake Charles club joined race CDs volunteered fill last minute vacancies leg Bo continue Abilene TX help out flight Shreveport Dallas long makes pit stops possible trouble Out five started Kellys Truck Stop morning four made no normal number problems broken props bent landing gears deadstick landings lost hatches crash two addition morning briefings Dont wear race hats back pilot vehicles tying Because no going lose valuable time retrieving race route well marked lost blue-and-white hats flight Mesquite Model Field Ft Worth uneventful five planes made short flight about 50 miles good time high point takeoff Mesquite reading proclamation mayor Dallas AMA past president Johnny Clemens along mayor pro tem Mesquite gave planes good send off landing Tarrant County Junior College landing area Fort Worth Jim Simpsons Southwest Modelers RC Club team least number problems took first place hardware three half minutes ahead John Kikers NASA Flyers Houston takeoff Ft Worth Wednesday 106 Model Aviation
Edition: Model Aviation - 1980/02
Page Numbers: 10, 11, 12, 13, 14, 15, 16, 17, 102, 104, 106
NO OCR TEXT NO OCR TEXT I SCENT I- I CSKCBc-CO lICK I I, ROCK-~c Alliii II JfpgTiC rI ICSONOOK PSFT IllsP5060110 0* FROB 106F0OOSKICK 0300 3~CO NKKKCOAIE01ItQS3i l&LCMCOCOBCCSOKSAL FIN SINK OKOCCISO ICSO0 PLOICSPLO0-00' r OCIKOO3KL573 OC OKKOKII OOEKLOCOSIK I..KOONlFS2PLO ICC SOUK 04013 pOKOOmI 40530 TMOSOKKL Naturally enough Don felt should seek aircraft similar layout Phoenix Zlin 526 726 series offered variety designs somewhat like Phoenix low-wing long-tail moment vehicles slightly swept wings Just finding full-scale aerobatic bird lines along success ful model design going enough however arrive winning design totally new event purpose avoid model flying characteristics stress scale realism decided go large light Large add realism presentation ease attitude recognition pilot judge Also large add drag slower flight again realism also help keep airplane 1200 box maneuvers performed Light weight considered essential vertical performance minimizing wing loading would allow sharp square comers flaps Another advantage light weight aerobatic aircraft Seen rear color-scheme lines emphasize feeling forward motion tenna strung stabilizer tip 12 Model Aviation Well-executed nose cowling really mean much Details ot tibergiass cowi snow up we. shotnote handling 4.m asn4 tho *sonInn Mir nnnnmnfl Just another picture provide another eyeview sne color scneme 11101 IS unarime Brown no Ice Mnlc fInuthrnusnl mumfflsr FULL SIZE PLANS AVAILABLE SEE PAGE 128 AICASONS LOAPJC/KAILWAASE7$5/SKOAKL PSOAOPCO oocsocxPSCMSATSSIALCCT n5/NACENT SAC III I S/SFLAT TOP SSAOSOLrCI S/A ISOCK 50 P55COMAI/ASPASTAPESS ACAS STACK SPACES/L/5S/SEALKM /LOS OP S/TA SCT P575555 ALLSACA SOOT ASK CT1 COT SACS/SBEAPtATPS SANK STACK1-U ACTAC PAN SCAM MASKS SAS TON ONE COLT AK/Sot5Ao5~OS MONET - X SET *I-2PM51 SAra S/lA SONTAIIfiAAA1AM NE iS/IA CSIAL-0515451C jF 05/IS ACAECttP tIZVCN II /S/ AGEMACAT POAS COATCCCNACCS~ SACASOC OCITSJ PANEL/Cl PS SIS/INOS ICS1/AMALSOp55 PCS 5/5505/SPM/CPBS MELLC PA ACCOLH OAMCS~ SOMI I/A SNUASO I I/S PCCI/A CCC Ii~2F /6II-I/-6-/vII//OSSOASK ACOOCENLACACICS OPI X KOCCOAOKkC /0 POSECCOK NOES _____________________________________________ III ThI jO fli AI EL PM II/A A/ALE MOCCA MO/NTCUT FRAN/NPUSECSOE ASKS IK SESOLOSCEKTSICK/AC PLO 00/MAPS/NO SOEKC IT IPASACNRO lASS PEAPSACALPSKLTION 00 I/S MACSMPTACONPSO7T- NOKOSjS/AC SOAPS rIIU/SSSOAAK~~ I/AS/C/ASS0I U[I II pIFS / H0500050/SC C/SPATS NOCCIOMA010 1/SOPLO1/ [ CUCTACAC 5/ASCOEC I I/N So/SECSET KACM/SF jMgj0I/SPLO5~ ISN-IS I/SNCUOSE] NLAOS CANE II / MOSPANI I/SN/C/COCKI/SM/AIOiMSj-ACOAS ~CUASE S SUNKCUT PACM I/S N/SECI II/MM/TO/CNL ASK CANOPY SE/CP1no 0550 CASASSICTS N/ASS/SN I CKASNKSO PLACE ----S often overlooked reduction inertia property also opposes cessation characteristics exactly what dont want angular moments inertia rotation airplane already rotating event precision point rolls snap An angular moment inertia mass property other words airplane high angular rolls required 3T maneuvers aircraft oppotes its rotation about moment inertia roll hard start rolling keeping structural weight absolute either its yaw pitch roll axis same difficult stop rolling once starts minimum could reduce moments February 1980 13 I I unsandL A/SSBCONAC /SSASSAC US SEA resmivemy simpie details complete tail detaches two separate pieces SACS ISS/odS 555 SES/Sy uc aeparaoeo orom inc stanhlizer reattached fuselage dowel two screws Facilitates transport i ysHIToo rU L 5QUARE RETRACT BEAM OUT TO BLOCS PLODD 5H0W 0 Up d\m ALTERNATE WING CONSTRUCTiON IS 3/3Z BALSA RIBS WITH SAME SPARS LEADING TRAILING EDGES 3/32 SHEET FRONT CECKING AEROCOMPOSITE CANOPY RUDDER & ELEVAlOR NYRODS TO SERVOS 3/8 BALSAN MIDDLE FAIRLEAD 6CKTO TAlL FOUR NO 2 SCREWS SECURE COWLING TO FUSELAGE I/8PIWJOD GUSSETS lOP AND BOTTOM WEBRA 91 ENGINE 2 3/4DIA- SPINNER AEROCOMPOSITES COWLING SCALE TO FIT 1/2 MAPLE ENGINE MOUNT . RECHESlOF-2 2 1/32 PLYWOOD FUSELAGE DOUBLER FROM F-I BELLY N IS CEMENTED 10 BOlTOM OF WING FIRST -24 SCREWS TO SECURE WING THRU 5/8 DOWELS 3A6 DOWELS IMBED INlO FOAM TO ANCHOR L G I/4 PLYVOD PLATFORM FOAM CORE IN RUDDER AND FIN II/4X3/4TE /16 PLYWXfl BOX3/16 X 1/4 FIN POSTI ENCASES STABILIZER1/16 SHEETING 5A6 DOWELS LOCKBALSA RUDDER FOST 1N TO FUSELAGE 3 /8 SQTOP ANDALL SCREWS HERE 3011DM FAIRLEAD 5/ 1600 WELFOR HORN 4-40 SCREWS MOUNT FIN BASETO BOX 4 BALSA DORSAL FOAM CORES / // WS I\~IssFiNPOST /GOLDBERG1/4 X 1/2 BALSA STABLIZER LE 5/16 DOWEL- 3/32 HOLE FOR HORN 1 1/2 DIA TAILWHEEL 1/4 SQ DIAGONALS 1/8 BALSA SIDE RINELS F-I 10 TAL3/16u X 3/8 BOTTOM KEEL V4SQ BOTTOM LONGERONS 10-24 REAR WING HOLD SCREVJS ThRJ 5/8DOWELS 1/8 MUSIC WIRE TOI/I& SHEET BALSATOP AND BOTfOM AILERON SERVOSV16 X 1/4 CAP STRIPS OVER FOAM 1 1/2 TRAILING EDGE STOCK DOUBLED FOR AILERONS 2 RETRACTABLE BELLCRANK ON 1/8 PLYWOOD PLATFOFA 1/4 X BALSA LEADING EDGEHOLLOWED BALSA BLOCK 3DIA MAIN WHEELS SOUTHERN RETRACT SYSTEM FROM SERVO POWER ONLY February 1980 15 1/4 HARD BALSA SPAR FRONT AND REAR TOP AND BCIlTCM inertia insure crisp totally controllable rotations aircraft about its axes finally settled Zlin 526 AS basis project 526 AS singleplace aerobatic low wing faired-in canopy in-line engine wing fairly high aspect ratio implies good roll damping leading edge swept straight trailing edge resulting wing sweep about 4 degrees Thrust line wing horizontal tail separated vertically very much usually means control coupling less likely Vertical tail size large enough scale directly horizontal tail size increased span chord maximum allowable 15% scale engine cowl allowed very neat inverted instal lation Webra 91 chosen power Finally retractable landing gear real aircraft allowed us include feature model well course airplane can improved made some subtle changes within rules hopes achieving model would fly con siderably better true scale replica Sym metrical airfoils substituted wing shortened its aspect ratio reduced widening tip chord wing also moved forward inch lengthen tail moment improve balance thrust line horizontal tail lowered wing raised slightly order bring surfaces nearly line thrust vector width fuselage reduced 15% canopy moved forward inch help knifeedge flight Strip ailerons substituted full-size aircrafts conventional ones horizontal tail increased chord span improve tail volume coefficient other aspects aircraft true scale very close including fuselage cross section aircraft sized 950 sq well over minimum quite bit smaller some other airplanes turned up Vegas weight goal set 9 pounds achieved would result excellent vertical per formance Webra 91 first version built-up wing vertical fin second 526 AS built Steve Rojecki foam wing cut out resemble rib structure added balsa spars sheeting wound up open framework foam wing closely resembling built-up version Both airplanes MonoKote Solar Film covered Epoxypainted fiberglass cowls custom molded canopies added complete vehicles both weighed 8 pounds ready fly minus fuel Initial flights both aircraft very encour aging obvious efforts achieve low angular inertia minimum weight paid off Square corners sharp clean precise starting stopping rolling maneuvers successfullly accomplished airplane fast highly desirable quality flying nearly constant speed high drag large airframe slowed down dives engine pulled vertically little sag due its low 16 Model Aviation Aft fuselage detail showing dowel holes screws attaching tail section Rudder pushrod attaches internally tail-wheel arm steering Larger size models permit flexibility structural design Underside detachable tail Three large holes pruvue eiuu tu ue screws attach fin stabilizer Two holes rear screws attach entire unit fuselage Using Southern RC retractswith Fox wheelsgear swings aft rather sideways duplicate retractable function real craft Servo installation wing aileron servo rear retract servo forward Bands hold screws place fuselage equipment bay dwarfs servo tray receiver forward batteries located under servo tray Note pushrods aluminum tubing weight reliability inside outside snapping maneuvers improved moving center gravity back its current location shown plans snaps also enhanced wing itself airfoil gets thinner toward tip leading edge sharpens outboard Both airplanes flown 1978 Tourn ament Champions new Prototype Pattern original built author flown 14th place finish Don Lowe other built Steve Rojecki flown Steve capacity pattern demonstration flier Steve competitor flew full pattern before judges during training beginning round official flying idea establish base flight judges rather have react differently first few flights round Steve probably got assignment proven flying abilities also because rare individual invited competitor did have qualified airplane event As case new events rules Vegas Prototype Pattern provisional subject change improvement based success first event rules changed 1980 Zlin 526 AS pre sented no longer eligible Vegas too small now minimum size mono plane has increased 1100 sq since Vegas invitational event limited about 25 select competitors unlikely would have built purpose Zlin 526 AS remains attractive model stand-off scale events 60 91 offers exciting bonus full aerobatic capability Construction Its always best tackle toughest building chore first. Normally means wing case fuselage rates first attention fuselage complicated its simulation real airplanes fabric covered longeron structure its provisions removable tail section tail separates fuselage make transporting airplane easier vertical fin may attached fuselage horizontal installed some reason wanted transport fuselage intact elevator halves sticking out happen have ample vehicle like van station wagon dont plan ship airplane Nevada year recom mend build permanent fixed tail surfaces reduces complexity saves weight eliminating lot plywood get started fuselage bulkheads Fl F2 two motor mounts 1/4 sq cross brace 1/16 floor between bulkheads Fl F2 assembled unit using slow setting epoxy Bulkheads F3 through F7 built up sa overlapping corner joints Add doublers join fuselage halves bulkheads F3 through F7 fuselage upside down flat building board aligned top view plans Add bulkheads F8 F9 after removing fuse lage board Before adding forward bulkhead unit epoxy aware fuselage sides will form hour glass top view unit added looks strange requires some good clamping possibly wet ting sides accomplish required order fair longeron-type aft fuselage struc ture smooth-sided nose structure Editors Note consider Zlin super aircraft skilled pilot wants something bit d/ferent special both personaiship heflies andfor highly realistic maneuvers can perform ft took little doing bring together Don Lowe Phoenix Marks given dashing off magazine projects developed design worked out Ken Don pooled wits ship built Ken pilot Lowe last saw Ken fly 1966 meet da4 Vince afellowRC oldtimer sur prised high level workmanship excellent writing long articleand would kits have such fine instructions Weve eliminate another article issue avoid diluting Kens copy top off Don Lowe did climactic commentay based upon piloting experiences basic fuselage box completed upper lower partial bulkheads added Next install 1/4 sq diagonal braces bottom fuselage add sq longerons point sq longerons top bottom edges fuselage sides glued place Fuselage top sheeting installed six pieces Two pieces 1/16 form turtledeck Four pieces 3/32 form top sheeting forward canopy Cross grain ting installed cockpit floor bottom nose after gas tank has installed Note Fuelproof entire gas tank compartment coat epoxy Add four pieces /4 balsa sheet two tail two above wing leading edge help fair longerons tailpost nose Cut wing saddles sheet glue fuselage Add ongerons fuselage sides epoxy plywood gussets strengthen motor mounts Before gluing om sheeting between F8 F9 tail wheel mount bolted F8 Also incorporating detachable tail ood plate should installed aft F9 back fuselage should faced 1/16 plywood flat surface removable tail sits covered 1/16 ply center has cut out aft section fuselage sanded such flat panels Monokote result covered flat upper enter ext center ower ower sq ower longeron finally / sq longeron middle 3/16 om central longeron t back fuselage beveled tapered fair sq longerons back tailpost t above wing leading edge faired sq wing saddle its rear edge feathered fuselage side its forward edge saddle sanded k its aft end about 3/16 thick its forward Continued page 102 February 1980 17 jetacnanie tail aetall shown align ment dowels parting line between vertical fin horizontal tail Ken Bonnema displays bottom ship can admire its color schemebit wild what Looking Better Silicone Tubing LUE LINE Its Thicker Stronger Highly Heat Resis tant Flexible other fuel lines Whats moreBLUE LINE eith er equal lower price others So dont fooled Remember ask original BLUE LINE tubing Send SASE today free catalog fine products El O7kENZ2 44W Prospect St New Haven Conn 06515 PRODUCTS safety radio control flying club needs some system aasure two transmitters same frequency notturnedon same time An orderly system does much avoid looks panic shouting flight lineor worse Generation Products producing com plete set engraved high quality frequency pins club use pins check hoard flight line moments panic can avoided frequency pins made high quality engravers plastic sandwich-like con struction numbers engraved cutting through top layer plastic thereby exposing second layer No paint used no fading wearing away numbers pin contains frequency number also color-codedtO match theflags transmitter Construction pins first rate set should stand up club use considerable time period product review product review product review ZIin/ Bonnema continued page 1 7 edge meets t al fin sanded Monokoted glued after rest fuselage has Monokoted Epoxy wing hold-downs drill yet Wing plans show foam wing mainly cause much simpler build no weight penalty occurred between Rojeckis foam wing built up version original wing half should cut lb/cu ft density foam block least 5 inches thick blocks faced foam wire cutter insure square Align root tip templates block absolutely no twist include dihedral raising centerline tip rib 070 inches above centerline root rib Locate root rib exact same place both blocks wing halves may joined blocks flat surface later Cut out core including spar notches using hot-wire bow Number rib templates before hand equal chord percentage segments hot wire may drawn past identical chord stations times both root tip templates After cores have cut blocks cut Out two templates cardboard thin plywood cutouts cores Place cores back blocks sandwich together place template side cut open areas push piece 1/16 music wire through spaces cut out Slip center-drilled piece l rod over end wire attach current regulated hot leads outside dowels Holding new hot wire wooden dowels run around inside templates thus cutting out area removed Repeat procedure cutout area Tapered spars cut very hard a glued cores Titebond epoxy Keep cores blocks weighted flat surface spars dry Next cut out landing gear unit clearance wheel wells servo boxes linkage channels copper wire forms placed heavy duty soldering gun Epoxy landing gear mounting plates 4-40 blind nuts already installed plates have four 3/16 dowels pro truding down foam extra gluing area added strength Glue bellcrank mounts install bellcranks landing gear linkage Sheet center section leading edge trailing edge 1/16 balsa sheet Slow setting epoxy sparingly applied balsa recommended Spreading epoxy foam does improve bond does add considerable weight Again set cores back blocks weight flat surface sheeting drying After sheeting dry trim excess sand flush foam Add tip blocks 3/16 trailing edge ing edge cap strips Remove sheeting has covered wheel well landing gear cavity Join wing halves flat surface epoxing center section both halves resting foam blocks Weight allow adequate time epoxy set up Ailerons laminated two pieces 1 trailing edge stock glued together longest surface longest surface leading edge bevel get quite enough must sanded allow sufficient aileron throw dowel drilled embedded aileron near root aileron horns essential An experiment 3/32 wire resulted aileron flutter fixed portion wing trailing edge lying between two ailerons laminated balsa sheet Clearance notched front piece Install aileron horn wires brass nylon guides before gluing central trailing edge section Drill holes clear through wing epoxy four ls have drilled through 3/16 wing bolts Sand flush upper lower surfaces wing reinforce wing center section wrap first layer 7-oz fiberglass cloth layer 2oz cloth Drill through hardened fiberglass open wing bolt holes Set wing fuselage align very carefully Run long 3/16 drill through bolt holes already wing drill through plywood wing mounting plates fuselage Remove wing enlarge holes fuselage plates install 10-24 blind nuts Bolt wing fuselage build up belly pan aligns perfectly fuselage Use paper tubes bolt guides through belly pan Cut away fiberglass balsa sheet covering servo box install rails aileron retract servos Rib spacing built up wing shown plans Using tip root templates provided sandwich 15 pieces 3/32 baisa between templates sand stack down form ribs wing half Spar location size un changed foam wing Leading edge trailing edge sheeting cap strips also un changed 1/16 balsa vertical grain spar webbing glued between ribs both front rear spars landing gear mount system shown can used ribs either side must reinforced plywood Wheel wells must built up 1/16 balsa sheet Ailerons tips center section including fiberglass reinforcement unchanged Tail Surfaces Foam cores vertical fin rudder stabilizer elevator cut using templates provided 1 / 16 sheeting epoxied wing surfaces left dry weighted foam blocks flat table Leading trailing edges tip blocks glued after sheeting has trimmed sanded Note 3/16 vertiial fin trailing edge exception glued foam core before sheeting sheeting overlaps Elevators rudder have l installed drilled 3/32 wire control horn joined stabilizer halves wrapped fiberglass cloth shown plans fol lowing steps must adhered 102 Model Aviation Available im 5 sizes fit appli cation about 59 per ft Shown above SUPER BLUE set upwith extra-large tubing 4 reusable ties & end-of-line nozzles $369 per pkg nrnrIiut review nrnduat review nrnduat review Frequency Pins @ $2500/ set Generation Pro ducts Co. Inc. 5512 Southwood Little Rock AR 72205 incorporating removable tail Spot glue mating piece 1/16 ply top plywood tail mounting surface fuselage upper piece should about shorter fuselage piece front edge piece glue another piece 1/16 ply matches upper middle quarter F8 including two 3/16 dowel holes Insert two 3/16 dowels through holes glue plywood floor glue dowels F8 back edge plywood floor glue F9A balsa Glue a lower saddles stabilizer Align stabilizer carefully glue saddles Glue a upper stabilizer saddles cap top saddles 1/16 plywood should now have box structure completely surrounding stabilizer plywood bottom top front balsa back break fuselage yet Spot glue another piece 1/16 plywood top box structure front edge piece glue piece plywood matches uppermost portion F8 including 3/16 dowel hole Also glue two blocks ood top plywood floor shown plans Drill 4-40 clearance hole through center front block clear through stabilizer box Drill two 4-40 clearance holes through rear block again clear through stabilizer box Enlarge three holes ply blocks install 4-40 blind nuts Insert piece 3/16 dowel through its hole glue plywood floor glue dowel F8 Now spot glue piece ood original 1/16 plywood tail mounting surface half-inch space left open behind stabilizer box k should fill entire space should 1/16 short width both sides Drill two 4-40 clearance holes through block through corresponding block fuselage underneath Enlarge holes upper block install two 4-40 blind nuts Now glue piece 1/16 plywood matches back face stabilizer box ood piece just installed 1/16 plywood floor spot glued top stabilizer box glue piece stabilizer box Now take sheeted vertical fin its extended hinge line post cut clearance bottom two plywood blind nut blocks 3/16 dowel mounted upper plywood floor Trim rudder post just contacts plywood blind nut block behind stabilizer box trim vertical fin sheeting fits over outside edges plywood block lines up fueslage sides Glue vertical fin upper plywood floor plywood pieces behind stabilizer box careful glue vertical fin assembly stabilizer box Glue sandtwo balsa blocks fair vertical fin F8 Finally add a dorsal fin assembly dry separate vertical fin assembly fuselage stabilizer box using razor blade break spot glue joints separate stabilizer box fuselage same way Enlarge three holes stabilizer box its lower side holes should opened up lower plywood floor stablizer itself enlarge holes upper plywood cap Glue paper straws act screw guides Now can sit back relax curse yourself building fixed tall fix tail surfaces simply eliminate plywood pieces enlarge balsa pieces accordingly glue everything together permanently Finishing Monokote Solar Film strongly recommended materials closely simulate fabric covering full-scale airplane offer lightest overall weight complete finish fiberglass engine cowl molded cellu lose acetate canopy available Aero composites Corp 411 Townsend Place Dayton 0hio4543 1 cowl frameworkmolded canopy painted match Mono kote colors used paint scheme OK WKE represents Czechoslovakian Team colors other airplane shown done British Aerobatic Team colors Since countries fly Zlin large variety color scheme options choose Installation Radio installation fairly straight forward use 60 stow flight pack battery above gas tank 91 locate battery above servo tray further aft necessary achieve proper CG receiver foam wrapped sits fuselage bay just front servo tray Aileron retract linkage shown drawings plans show independent control horns elevator half require pushrod exits rear fuselage both sides M alternative elevator halves may joined central horn single pushrod concealed fuselage rudder pushrod may attached internally tail wheel steering arm before exits fuselage side its way back rudder Flying 526 AS Zlin designed high-performance machine capable perform ing AMA FAI Vegas Tournament maneuvers Flying aircraft pure pleasure difficult considering its very high performance potential Takeoffs piece 104 Model Aviation Please send mecopies new 5th edition Radio Control Buyers Guide Enclosed $825 copy ordered $725 retail plus $100 postage & handling City State ZIP Return RC Buyers Guide Clifton House Clifton VA 22024 Purchasing R/C Aircraft easy YOUNIQUE AT Hobby Capitol keep large ready supply Custom-But RC Aircraft Kits Engines RC Units times And. thanks years experience dealing people sections US. prepare special one-of-a-kind RC Aircraft special one-ofa-kind RC flyer demands unique look express tastes Chances youll find custom paint finish exquisite detailed cockpit interiors glassed engine compartments real scale wheels custom grilled nose section will knock socks offi l probably never see another like cause Hobby Capitol expert stressed preparation goes far beyond standard checkout RC shoppers turning up increasing numbers convenient showroom because word out. outstanding buys service finest selection unique RC Aircraft anywhere its HOBBY CAPITOL Old Ignition Trade-in Buy sell old time ignition engines Box up what yau have send us honest appraisal could worth new proportional set have engines can also start collection welcome built-up airplanes used proportionals old time ignition engines Come trade us Top dollar Custom-1311t-RjC Built Order Plans Ft stock choose Its s40000 PIp TrI-Pocm Quorter-ale 89 wingspan 42 Sq Ft detajied dans $1699 PP nd $100 self addressed stomped envelope detoiled list Built-Up R/C Models 50% Sole Hobby Capitol 46 N Oak St Ventura CA 93001 Phone 805 643-7616 642-8465 cake Landings require little care prevent tip stall still very slow generous wing area would recommend drag nose high however Super docile land ings could achieved some sacrifice snapping capability blunting wing leading edge toward tip can play its performance potential starting forward CG slowly moving back improve snapping roll characteristics used fairly aft CG location get very best performance snaps rolls also worked bit wing incidence engine thrust line zero-zero set up works well little bit engine right thrust ease torque effects Speaking torque Webra 91 pulls aircraft along ease using 14-6 7 prop used non-stock 60-size Perry pump carburetor Webra since will turn 10500 11000 carb prop choice becomes critical Vertical performance first thing suffer engine prop mismatched large high-drag airplanes like recommend very stiff torque pushrods throughout since control loads high will want use husky servos extremely tight centering resolution have found big ships rapid pot wear occurs servos tight due control loads increased control surface dither Fortunately will find large slow aircraft tolerant control dead-band high-speed pattern ships Im sure will especially appreciate very tight looping cornering capability Zlin large wing low wing loading will give spectacularly tight square loops Rolling maneuvers will require little work standard pattern ship due reduced airspeed smaller power loading somewhat shortcoupled design Youll find other large slower aircraft require increased proficiency rudder part pilot really feel will enjoy flying Zlin because combines realistic good looks fine aerobatic performance What could modeler ask Trans America Riches continued page 24 necessary know would no flying Wednesday made two Wed nesdays row After awards presentation motel Meridian team first 3 minutes ahead number 2 Montgomery team officials off Jackson MS start next leg high winds bothering Riches pick up worse Saggin Wagon AMA motorhome Bob Roach drove bad left rear spring causing perpetual lean hence Saggin Wagon weather clearing Jackson reports pretty good next morning didnt help Jimmy Grier tonight Three team members airplanes still Chicago Jerry Nelson have Jackson already planes Hurricane Frederick delayed slightly would early next morning Doc Edwards Jimmy takeoff area early rest Team 3 BTHOOM Team wasnt Jimmys Cessna somewhere between Chicago Jackson didnt look good though up until around 2 am fixing Docs truck pilot vehicle borrowed lead vehicle didnt look BTHOOM team going make alone ask what BTHOOM team Jimmy Grier asked what name team replied after slight delay Beats Hell Out other four teams off away frontage road takeoff area still no planes Jimmys team no rest team did arrive frantic rush get ready air being taped TV crew arrived late teams ran close part leg passing other pit stops teams good times team work payed off though three planes crashed Everyone ready takeoff West Monroe LA mayor hand see planes off police help teams get through traffic lights onto freeway fire department added nice touch hot coffee everyone Bob Roach much happier now wife Sue joined him Jackson would take care selling chances Pitts Special souvenirs rest trip As usual days flights uneventful Murphys Law again teams close coming Sharks field Bossier City LA Shreveport club big recep tion barbecue ready police escort freeway field big help did cause some confusion Doc Edwards trying get lead vehicle ahead guide Team 3s pilot vehicle landing area police car raced past going other direction siren wailing lights flashing police car made abrupt U-turn Doc jammed brakes let pass As Doc watching pull alongside thought bought sure policeman leaned Out window big sweeping motion arm yelled Cmon lets make Doc told Doris little later lucky have coronary Team 5 Sharks Club team fittingly received champagne first team top honors leg Shreveport John Embry AMA VP District VIII Ba Kinch Lake Charles club joined race CDs volunteered fill last minute vacancies leg Bo continue Abilene TX help out flight Shreveport Dallas long makes pit stops possible trouble Out five started Kellys Truck Stop morning four made no normal number problems broken props bent landing gears deadstick landings lost hatches crash two addition morning briefings Dont wear race hats back pilot vehicles tying Because no going lose valuable time retrieving race route well marked lost blue-and-white hats flight Mesquite Model Field Ft Worth uneventful five planes made short flight about 50 miles good time high point takeoff Mesquite reading proclamation mayor Dallas AMA past president Johnny Clemens along mayor pro tem Mesquite gave planes good send off landing Tarrant County Junior College landing area Fort Worth Jim Simpsons Southwest Modelers RC Club team least number problems took first place hardware three half minutes ahead John Kikers NASA Flyers Houston takeoff Ft Worth Wednesday 106 Model Aviation
Edition: Model Aviation - 1980/02
Page Numbers: 10, 11, 12, 13, 14, 15, 16, 17, 102, 104, 106
NO OCR TEXT NO OCR TEXT I SCENT I- I CSKCBc-CO lICK I I, ROCK-~c Alliii II JfpgTiC rI ICSONOOK PSFT IllsP5060110 0* FROB 106F0OOSKICK 0300 3~CO NKKKCOAIE01ItQS3i l&LCMCOCOBCCSOKSAL FIN SINK OKOCCISO ICSO0 PLOICSPLO0-00' r OCIKOO3KL573 OC OKKOKII OOEKLOCOSIK I..KOONlFS2PLO ICC SOUK 04013 pOKOOmI 40530 TMOSOKKL Naturally enough Don felt should seek aircraft similar layout Phoenix Zlin 526 726 series offered variety designs somewhat like Phoenix low-wing long-tail moment vehicles slightly swept wings Just finding full-scale aerobatic bird lines along success ful model design going enough however arrive winning design totally new event purpose avoid model flying characteristics stress scale realism decided go large light Large add realism presentation ease attitude recognition pilot judge Also large add drag slower flight again realism also help keep airplane 1200 box maneuvers performed Light weight considered essential vertical performance minimizing wing loading would allow sharp square comers flaps Another advantage light weight aerobatic aircraft Seen rear color-scheme lines emphasize feeling forward motion tenna strung stabilizer tip 12 Model Aviation Well-executed nose cowling really mean much Details ot tibergiass cowi snow up we. shotnote handling 4.m asn4 tho *sonInn Mir nnnnmnfl Just another picture provide another eyeview sne color scneme 11101 IS unarime Brown no Ice Mnlc fInuthrnusnl mumfflsr FULL SIZE PLANS AVAILABLE SEE PAGE 128 AICASONS LOAPJC/KAILWAASE7$5/SKOAKL PSOAOPCO oocsocxPSCMSATSSIALCCT n5/NACENT SAC III I S/SFLAT TOP SSAOSOLrCI S/A ISOCK 50 P55COMAI/ASPASTAPESS ACAS STACK SPACES/L/5S/SEALKM /LOS OP S/TA SCT P575555 ALLSACA SOOT ASK CT1 COT SACS/SBEAPtATPS SANK STACK1-U ACTAC PAN SCAM MASKS SAS TON ONE COLT AK/Sot5Ao5~OS MONET - X SET *I-2PM51 SAra S/lA SONTAIIfiAAA1AM NE iS/IA CSIAL-0515451C jF 05/IS ACAECttP tIZVCN II /S/ AGEMACAT POAS COATCCCNACCS~ SACASOC OCITSJ PANEL/Cl PS SIS/INOS ICS1/AMALSOp55 PCS 5/5505/SPM/CPBS MELLC PA ACCOLH OAMCS~ SOMI I/A SNUASO I I/S PCCI/A CCC Ii~2F /6II-I/-6-/vII//OSSOASK ACOOCENLACACICS OPI X KOCCOAOKkC /0 POSECCOK NOES _____________________________________________ III ThI jO fli AI EL PM II/A A/ALE MOCCA MO/NTCUT FRAN/NPUSECSOE ASKS IK SESOLOSCEKTSICK/AC PLO 00/MAPS/NO SOEKC IT IPASACNRO lASS PEAPSACALPSKLTION 00 I/S MACSMPTACONPSO7T- NOKOSjS/AC SOAPS rIIU/SSSOAAK~~ I/AS/C/ASS0I U[I II pIFS / H0500050/SC C/SPATS NOCCIOMA010 1/SOPLO1/ [ CUCTACAC 5/ASCOEC I I/N So/SECSET KACM/SF jMgj0I/SPLO5~ ISN-IS I/SNCUOSE] NLAOS CANE II / MOSPANI I/SN/C/COCKI/SM/AIOiMSj-ACOAS ~CUASE S SUNKCUT PACM I/S N/SECI II/MM/TO/CNL ASK CANOPY SE/CP1no 0550 CASASSICTS N/ASS/SN I CKASNKSO PLACE ----S often overlooked reduction inertia property also opposes cessation characteristics exactly what dont want angular moments inertia rotation airplane already rotating event precision point rolls snap An angular moment inertia mass property other words airplane high angular rolls required 3T maneuvers aircraft oppotes its rotation about moment inertia roll hard start rolling keeping structural weight absolute either its yaw pitch roll axis same difficult stop rolling once starts minimum could reduce moments February 1980 13 I I unsandL A/SSBCONAC /SSASSAC US SEA resmivemy simpie details complete tail detaches two separate pieces SACS ISS/odS 555 SES/Sy uc aeparaoeo orom inc stanhlizer reattached fuselage dowel two screws Facilitates transport i ysHIToo rU L 5QUARE RETRACT BEAM OUT TO BLOCS PLODD 5H0W 0 Up d\m ALTERNATE WING CONSTRUCTiON IS 3/3Z BALSA RIBS WITH SAME SPARS LEADING TRAILING EDGES 3/32 SHEET FRONT CECKING AEROCOMPOSITE CANOPY RUDDER & ELEVAlOR NYRODS TO SERVOS 3/8 BALSAN MIDDLE FAIRLEAD 6CKTO TAlL FOUR NO 2 SCREWS SECURE COWLING TO FUSELAGE I/8PIWJOD GUSSETS lOP AND BOTTOM WEBRA 91 ENGINE 2 3/4DIA- SPINNER AEROCOMPOSITES COWLING SCALE TO FIT 1/2 MAPLE ENGINE MOUNT . RECHESlOF-2 2 1/32 PLYWOOD FUSELAGE DOUBLER FROM F-I BELLY N IS CEMENTED 10 BOlTOM OF WING FIRST -24 SCREWS TO SECURE WING THRU 5/8 DOWELS 3A6 DOWELS IMBED INlO FOAM TO ANCHOR L G I/4 PLYVOD PLATFORM FOAM CORE IN RUDDER AND FIN II/4X3/4TE /16 PLYWXfl BOX3/16 X 1/4 FIN POSTI ENCASES STABILIZER1/16 SHEETING 5A6 DOWELS LOCKBALSA RUDDER FOST 1N TO FUSELAGE 3 /8 SQTOP ANDALL SCREWS HERE 3011DM FAIRLEAD 5/ 1600 WELFOR HORN 4-40 SCREWS MOUNT FIN BASETO BOX 4 BALSA DORSAL FOAM CORES / // WS I\~IssFiNPOST /GOLDBERG1/4 X 1/2 BALSA STABLIZER LE 5/16 DOWEL- 3/32 HOLE FOR HORN 1 1/2 DIA TAILWHEEL 1/4 SQ DIAGONALS 1/8 BALSA SIDE RINELS F-I 10 TAL3/16u X 3/8 BOTTOM KEEL V4SQ BOTTOM LONGERONS 10-24 REAR WING HOLD SCREVJS ThRJ 5/8DOWELS 1/8 MUSIC WIRE TOI/I& SHEET BALSATOP AND BOTfOM AILERON SERVOSV16 X 1/4 CAP STRIPS OVER FOAM 1 1/2 TRAILING EDGE STOCK DOUBLED FOR AILERONS 2 RETRACTABLE BELLCRANK ON 1/8 PLYWOOD PLATFOFA 1/4 X BALSA LEADING EDGEHOLLOWED BALSA BLOCK 3DIA MAIN WHEELS SOUTHERN RETRACT SYSTEM FROM SERVO POWER ONLY February 1980 15 1/4 HARD BALSA SPAR FRONT AND REAR TOP AND BCIlTCM inertia insure crisp totally controllable rotations aircraft about its axes finally settled Zlin 526 AS basis project 526 AS singleplace aerobatic low wing faired-in canopy in-line engine wing fairly high aspect ratio implies good roll damping leading edge swept straight trailing edge resulting wing sweep about 4 degrees Thrust line wing horizontal tail separated vertically very much usually means control coupling less likely Vertical tail size large enough scale directly horizontal tail size increased span chord maximum allowable 15% scale engine cowl allowed very neat inverted instal lation Webra 91 chosen power Finally retractable landing gear real aircraft allowed us include feature model well course airplane can improved made some subtle changes within rules hopes achieving model would fly con siderably better true scale replica Sym metrical airfoils substituted wing shortened its aspect ratio reduced widening tip chord wing also moved forward inch lengthen tail moment improve balance thrust line horizontal tail lowered wing raised slightly order bring surfaces nearly line thrust vector width fuselage reduced 15% canopy moved forward inch help knifeedge flight Strip ailerons substituted full-size aircrafts conventional ones horizontal tail increased chord span improve tail volume coefficient other aspects aircraft true scale very close including fuselage cross section aircraft sized 950 sq well over minimum quite bit smaller some other airplanes turned up Vegas weight goal set 9 pounds achieved would result excellent vertical per formance Webra 91 first version built-up wing vertical fin second 526 AS built Steve Rojecki foam wing cut out resemble rib structure added balsa spars sheeting wound up open framework foam wing closely resembling built-up version Both airplanes MonoKote Solar Film covered Epoxypainted fiberglass cowls custom molded canopies added complete vehicles both weighed 8 pounds ready fly minus fuel Initial flights both aircraft very encour aging obvious efforts achieve low angular inertia minimum weight paid off Square corners sharp clean precise starting stopping rolling maneuvers successfullly accomplished airplane fast highly desirable quality flying nearly constant speed high drag large airframe slowed down dives engine pulled vertically little sag due its low 16 Model Aviation Aft fuselage detail showing dowel holes screws attaching tail section Rudder pushrod attaches internally tail-wheel arm steering Larger size models permit flexibility structural design Underside detachable tail Three large holes pruvue eiuu tu ue screws attach fin stabilizer Two holes rear screws attach entire unit fuselage Using Southern RC retractswith Fox wheelsgear swings aft rather sideways duplicate retractable function real craft Servo installation wing aileron servo rear retract servo forward Bands hold screws place fuselage equipment bay dwarfs servo tray receiver forward batteries located under servo tray Note pushrods aluminum tubing weight reliability inside outside snapping maneuvers improved moving center gravity back its current location shown plans snaps also enhanced wing itself airfoil gets thinner toward tip leading edge sharpens outboard Both airplanes flown 1978 Tourn ament Champions new Prototype Pattern original built author flown 14th place finish Don Lowe other built Steve Rojecki flown Steve capacity pattern demonstration flier Steve competitor flew full pattern before judges during training beginning round official flying idea establish base flight judges rather have react differently first few flights round Steve probably got assignment proven flying abilities also because rare individual invited competitor did have qualified airplane event As case new events rules Vegas Prototype Pattern provisional subject change improvement based success first event rules changed 1980 Zlin 526 AS pre sented no longer eligible Vegas too small now minimum size mono plane has increased 1100 sq since Vegas invitational event limited about 25 select competitors unlikely would have built purpose Zlin 526 AS remains attractive model stand-off scale events 60 91 offers exciting bonus full aerobatic capability Construction Its always best tackle toughest building chore first. Normally means wing case fuselage rates first attention fuselage complicated its simulation real airplanes fabric covered longeron structure its provisions removable tail section tail separates fuselage make transporting airplane easier vertical fin may attached fuselage horizontal installed some reason wanted transport fuselage intact elevator halves sticking out happen have ample vehicle like van station wagon dont plan ship airplane Nevada year recom mend build permanent fixed tail surfaces reduces complexity saves weight eliminating lot plywood get started fuselage bulkheads Fl F2 two motor mounts 1/4 sq cross brace 1/16 floor between bulkheads Fl F2 assembled unit using slow setting epoxy Bulkheads F3 through F7 built up sa overlapping corner joints Add doublers join fuselage halves bulkheads F3 through F7 fuselage upside down flat building board aligned top view plans Add bulkheads F8 F9 after removing fuse lage board Before adding forward bulkhead unit epoxy aware fuselage sides will form hour glass top view unit added looks strange requires some good clamping possibly wet ting sides accomplish required order fair longeron-type aft fuselage struc ture smooth-sided nose structure Editors Note consider Zlin super aircraft skilled pilot wants something bit d/ferent special both personaiship heflies andfor highly realistic maneuvers can perform ft took little doing bring together Don Lowe Phoenix Marks given dashing off magazine projects developed design worked out Ken Don pooled wits ship built Ken pilot Lowe last saw Ken fly 1966 meet da4 Vince afellowRC oldtimer sur prised high level workmanship excellent writing long articleand would kits have such fine instructions Weve eliminate another article issue avoid diluting Kens copy top off Don Lowe did climactic commentay based upon piloting experiences basic fuselage box completed upper lower partial bulkheads added Next install 1/4 sq diagonal braces bottom fuselage add sq longerons point sq longerons top bottom edges fuselage sides glued place Fuselage top sheeting installed six pieces Two pieces 1/16 form turtledeck Four pieces 3/32 form top sheeting forward canopy Cross grain ting installed cockpit floor bottom nose after gas tank has installed Note Fuelproof entire gas tank compartment coat epoxy Add four pieces /4 balsa sheet two tail two above wing leading edge help fair longerons tailpost nose Cut wing saddles sheet glue fuselage Add ongerons fuselage sides epoxy plywood gussets strengthen motor mounts Before gluing om sheeting between F8 F9 tail wheel mount bolted F8 Also incorporating detachable tail ood plate should installed aft F9 back fuselage should faced 1/16 plywood flat surface removable tail sits covered 1/16 ply center has cut out aft section fuselage sanded such flat panels Monokote result covered flat upper enter ext center ower ower sq ower longeron finally / sq longeron middle 3/16 om central longeron t back fuselage beveled tapered fair sq longerons back tailpost t above wing leading edge faired sq wing saddle its rear edge feathered fuselage side its forward edge saddle sanded k its aft end about 3/16 thick its forward Continued page 102 February 1980 17 jetacnanie tail aetall shown align ment dowels parting line between vertical fin horizontal tail Ken Bonnema displays bottom ship can admire its color schemebit wild what Looking Better Silicone Tubing LUE LINE Its Thicker Stronger Highly Heat Resis tant Flexible other fuel lines Whats moreBLUE LINE eith er equal lower price others So dont fooled Remember ask original BLUE LINE tubing Send SASE today free catalog fine products El O7kENZ2 44W Prospect St New Haven Conn 06515 PRODUCTS safety radio control flying club needs some system aasure two transmitters same frequency notturnedon same time An orderly system does much avoid looks panic shouting flight lineor worse Generation Products producing com plete set engraved high quality frequency pins club use pins check hoard flight line moments panic can avoided frequency pins made high quality engravers plastic sandwich-like con struction numbers engraved cutting through top layer plastic thereby exposing second layer No paint used no fading wearing away numbers pin contains frequency number also color-codedtO match theflags transmitter Construction pins first rate set should stand up club use considerable time period product review product review product review ZIin/ Bonnema continued page 1 7 edge meets t al fin sanded Monokoted glued after rest fuselage has Monokoted Epoxy wing hold-downs drill yet Wing plans show foam wing mainly cause much simpler build no weight penalty occurred between Rojeckis foam wing built up version original wing half should cut lb/cu ft density foam block least 5 inches thick blocks faced foam wire cutter insure square Align root tip templates block absolutely no twist include dihedral raising centerline tip rib 070 inches above centerline root rib Locate root rib exact same place both blocks wing halves may joined blocks flat surface later Cut out core including spar notches using hot-wire bow Number rib templates before hand equal chord percentage segments hot wire may drawn past identical chord stations times both root tip templates After cores have cut blocks cut Out two templates cardboard thin plywood cutouts cores Place cores back blocks sandwich together place template side cut open areas push piece 1/16 music wire through spaces cut out Slip center-drilled piece l rod over end wire attach current regulated hot leads outside dowels Holding new hot wire wooden dowels run around inside templates thus cutting out area removed Repeat procedure cutout area Tapered spars cut very hard a glued cores Titebond epoxy Keep cores blocks weighted flat surface spars dry Next cut out landing gear unit clearance wheel wells servo boxes linkage channels copper wire forms placed heavy duty soldering gun Epoxy landing gear mounting plates 4-40 blind nuts already installed plates have four 3/16 dowels pro truding down foam extra gluing area added strength Glue bellcrank mounts install bellcranks landing gear linkage Sheet center section leading edge trailing edge 1/16 balsa sheet Slow setting epoxy sparingly applied balsa recommended Spreading epoxy foam does improve bond does add considerable weight Again set cores back blocks weight flat surface sheeting drying After sheeting dry trim excess sand flush foam Add tip blocks 3/16 trailing edge ing edge cap strips Remove sheeting has covered wheel well landing gear cavity Join wing halves flat surface epoxing center section both halves resting foam blocks Weight allow adequate time epoxy set up Ailerons laminated two pieces 1 trailing edge stock glued together longest surface longest surface leading edge bevel get quite enough must sanded allow sufficient aileron throw dowel drilled embedded aileron near root aileron horns essential An experiment 3/32 wire resulted aileron flutter fixed portion wing trailing edge lying between two ailerons laminated balsa sheet Clearance notched front piece Install aileron horn wires brass nylon guides before gluing central trailing edge section Drill holes clear through wing epoxy four ls have drilled through 3/16 wing bolts Sand flush upper lower surfaces wing reinforce wing center section wrap first layer 7-oz fiberglass cloth layer 2oz cloth Drill through hardened fiberglass open wing bolt holes Set wing fuselage align very carefully Run long 3/16 drill through bolt holes already wing drill through plywood wing mounting plates fuselage Remove wing enlarge holes fuselage plates install 10-24 blind nuts Bolt wing fuselage build up belly pan aligns perfectly fuselage Use paper tubes bolt guides through belly pan Cut away fiberglass balsa sheet covering servo box install rails aileron retract servos Rib spacing built up wing shown plans Using tip root templates provided sandwich 15 pieces 3/32 baisa between templates sand stack down form ribs wing half Spar location size un changed foam wing Leading edge trailing edge sheeting cap strips also un changed 1/16 balsa vertical grain spar webbing glued between ribs both front rear spars landing gear mount system shown can used ribs either side must reinforced plywood Wheel wells must built up 1/16 balsa sheet Ailerons tips center section including fiberglass reinforcement unchanged Tail Surfaces Foam cores vertical fin rudder stabilizer elevator cut using templates provided 1 / 16 sheeting epoxied wing surfaces left dry weighted foam blocks flat table Leading trailing edges tip blocks glued after sheeting has trimmed sanded Note 3/16 vertiial fin trailing edge exception glued foam core before sheeting sheeting overlaps Elevators rudder have l installed drilled 3/32 wire control horn joined stabilizer halves wrapped fiberglass cloth shown plans fol lowing steps must adhered 102 Model Aviation Available im 5 sizes fit appli cation about 59 per ft Shown above SUPER BLUE set upwith extra-large tubing 4 reusable ties & end-of-line nozzles $369 per pkg nrnrIiut review nrnduat review nrnduat review Frequency Pins @ $2500/ set Generation Pro ducts Co. Inc. 5512 Southwood Little Rock AR 72205 incorporating removable tail Spot glue mating piece 1/16 ply top plywood tail mounting surface fuselage upper piece should about shorter fuselage piece front edge piece glue another piece 1/16 ply matches upper middle quarter F8 including two 3/16 dowel holes Insert two 3/16 dowels through holes glue plywood floor glue dowels F8 back edge plywood floor glue F9A balsa Glue a lower saddles stabilizer Align stabilizer carefully glue saddles Glue a upper stabilizer saddles cap top saddles 1/16 plywood should now have box structure completely surrounding stabilizer plywood bottom top front balsa back break fuselage yet Spot glue another piece 1/16 plywood top box structure front edge piece glue piece plywood matches uppermost portion F8 including 3/16 dowel hole Also glue two blocks ood top plywood floor shown plans Drill 4-40 clearance hole through center front block clear through stabilizer box Drill two 4-40 clearance holes through rear block again clear through stabilizer box Enlarge three holes ply blocks install 4-40 blind nuts Insert piece 3/16 dowel through its hole glue plywood floor glue dowel F8 Now spot glue piece ood original 1/16 plywood tail mounting surface half-inch space left open behind stabilizer box k should fill entire space should 1/16 short width both sides Drill two 4-40 clearance holes through block through corresponding block fuselage underneath Enlarge holes upper block install two 4-40 blind nuts Now glue piece 1/16 plywood matches back face stabilizer box ood piece just installed 1/16 plywood floor spot glued top stabilizer box glue piece stabilizer box Now take sheeted vertical fin its extended hinge line post cut clearance bottom two plywood blind nut blocks 3/16 dowel mounted upper plywood floor Trim rudder post just contacts plywood blind nut block behind stabilizer box trim vertical fin sheeting fits over outside edges plywood block lines up fueslage sides Glue vertical fin upper plywood floor plywood pieces behind stabilizer box careful glue vertical fin assembly stabilizer box Glue sandtwo balsa blocks fair vertical fin F8 Finally add a dorsal fin assembly dry separate vertical fin assembly fuselage stabilizer box using razor blade break spot glue joints separate stabilizer box fuselage same way Enlarge three holes stabilizer box its lower side holes should opened up lower plywood floor stablizer itself enlarge holes upper plywood cap Glue paper straws act screw guides Now can sit back relax curse yourself building fixed tall fix tail surfaces simply eliminate plywood pieces enlarge balsa pieces accordingly glue everything together permanently Finishing Monokote Solar Film strongly recommended materials closely simulate fabric covering full-scale airplane offer lightest overall weight complete finish fiberglass engine cowl molded cellu lose acetate canopy available Aero composites Corp 411 Townsend Place Dayton 0hio4543 1 cowl frameworkmolded canopy painted match Mono kote colors used paint scheme OK WKE represents Czechoslovakian Team colors other airplane shown done British Aerobatic Team colors Since countries fly Zlin large variety color scheme options choose Installation Radio installation fairly straight forward use 60 stow flight pack battery above gas tank 91 locate battery above servo tray further aft necessary achieve proper CG receiver foam wrapped sits fuselage bay just front servo tray Aileron retract linkage shown drawings plans show independent control horns elevator half require pushrod exits rear fuselage both sides M alternative elevator halves may joined central horn single pushrod concealed fuselage rudder pushrod may attached internally tail wheel steering arm before exits fuselage side its way back rudder Flying 526 AS Zlin designed high-performance machine capable perform ing AMA FAI Vegas Tournament maneuvers Flying aircraft pure pleasure difficult considering its very high performance potential Takeoffs piece 104 Model Aviation Please send mecopies new 5th edition Radio Control Buyers Guide Enclosed $825 copy ordered $725 retail plus $100 postage & handling City State ZIP Return RC Buyers Guide Clifton House Clifton VA 22024 Purchasing R/C Aircraft easy YOUNIQUE AT Hobby Capitol keep large ready supply Custom-But RC Aircraft Kits Engines RC Units times And. thanks years experience dealing people sections US. prepare special one-of-a-kind RC Aircraft special one-ofa-kind RC flyer demands unique look express tastes Chances youll find custom paint finish exquisite detailed cockpit interiors glassed engine compartments real scale wheels custom grilled nose section will knock socks offi l probably never see another like cause Hobby Capitol expert stressed preparation goes far beyond standard checkout RC shoppers turning up increasing numbers convenient showroom because word out. outstanding buys service finest selection unique RC Aircraft anywhere its HOBBY CAPITOL Old Ignition Trade-in Buy sell old time ignition engines Box up what yau have send us honest appraisal could worth new proportional set have engines can also start collection welcome built-up airplanes used proportionals old time ignition engines Come trade us Top dollar Custom-1311t-RjC Built Order Plans Ft stock choose Its s40000 PIp TrI-Pocm Quorter-ale 89 wingspan 42 Sq Ft detajied dans $1699 PP nd $100 self addressed stomped envelope detoiled list Built-Up R/C Models 50% Sole Hobby Capitol 46 N Oak St Ventura CA 93001 Phone 805 643-7616 642-8465 cake Landings require little care prevent tip stall still very slow generous wing area would recommend drag nose high however Super docile land ings could achieved some sacrifice snapping capability blunting wing leading edge toward tip can play its performance potential starting forward CG slowly moving back improve snapping roll characteristics used fairly aft CG location get very best performance snaps rolls also worked bit wing incidence engine thrust line zero-zero set up works well little bit engine right thrust ease torque effects Speaking torque Webra 91 pulls aircraft along ease using 14-6 7 prop used non-stock 60-size Perry pump carburetor Webra since will turn 10500 11000 carb prop choice becomes critical Vertical performance first thing suffer engine prop mismatched large high-drag airplanes like recommend very stiff torque pushrods throughout since control loads high will want use husky servos extremely tight centering resolution have found big ships rapid pot wear occurs servos tight due control loads increased control surface dither Fortunately will find large slow aircraft tolerant control dead-band high-speed pattern ships Im sure will especially appreciate very tight looping cornering capability Zlin large wing low wing loading will give spectacularly tight square loops Rolling maneuvers will require little work standard pattern ship due reduced airspeed smaller power loading somewhat shortcoupled design Youll find other large slower aircraft require increased proficiency rudder part pilot really feel will enjoy flying Zlin because combines realistic good looks fine aerobatic performance What could modeler ask Trans America Riches continued page 24 necessary know would no flying Wednesday made two Wed nesdays row After awards presentation motel Meridian team first 3 minutes ahead number 2 Montgomery team officials off Jackson MS start next leg high winds bothering Riches pick up worse Saggin Wagon AMA motorhome Bob Roach drove bad left rear spring causing perpetual lean hence Saggin Wagon weather clearing Jackson reports pretty good next morning didnt help Jimmy Grier tonight Three team members airplanes still Chicago Jerry Nelson have Jackson already planes Hurricane Frederick delayed slightly would early next morning Doc Edwards Jimmy takeoff area early rest Team 3 BTHOOM Team wasnt Jimmys Cessna somewhere between Chicago Jackson didnt look good though up until around 2 am fixing Docs truck pilot vehicle borrowed lead vehicle didnt look BTHOOM team going make alone ask what BTHOOM team Jimmy Grier asked what name team replied after slight delay Beats Hell Out other four teams off away frontage road takeoff area still no planes Jimmys team no rest team did arrive frantic rush get ready air being taped TV crew arrived late teams ran close part leg passing other pit stops teams good times team work payed off though three planes crashed Everyone ready takeoff West Monroe LA mayor hand see planes off police help teams get through traffic lights onto freeway fire department added nice touch hot coffee everyone Bob Roach much happier now wife Sue joined him Jackson would take care selling chances Pitts Special souvenirs rest trip As usual days flights uneventful Murphys Law again teams close coming Sharks field Bossier City LA Shreveport club big recep tion barbecue ready police escort freeway field big help did cause some confusion Doc Edwards trying get lead vehicle ahead guide Team 3s pilot vehicle landing area police car raced past going other direction siren wailing lights flashing police car made abrupt U-turn Doc jammed brakes let pass As Doc watching pull alongside thought bought sure policeman leaned Out window big sweeping motion arm yelled Cmon lets make Doc told Doris little later lucky have coronary Team 5 Sharks Club team fittingly received champagne first team top honors leg Shreveport John Embry AMA VP District VIII Ba Kinch Lake Charles club joined race CDs volunteered fill last minute vacancies leg Bo continue Abilene TX help out flight Shreveport Dallas long makes pit stops possible trouble Out five started Kellys Truck Stop morning four made no normal number problems broken props bent landing gears deadstick landings lost hatches crash two addition morning briefings Dont wear race hats back pilot vehicles tying Because no going lose valuable time retrieving race route well marked lost blue-and-white hats flight Mesquite Model Field Ft Worth uneventful five planes made short flight about 50 miles good time high point takeoff Mesquite reading proclamation mayor Dallas AMA past president Johnny Clemens along mayor pro tem Mesquite gave planes good send off landing Tarrant County Junior College landing area Fort Worth Jim Simpsons Southwest Modelers RC Club team least number problems took first place hardware three half minutes ahead John Kikers NASA Flyers Houston takeoff Ft Worth Wednesday 106 Model Aviation
Edition: Model Aviation - 1980/02
Page Numbers: 10, 11, 12, 13, 14, 15, 16, 17, 102, 104, 106
NO OCR TEXT NO OCR TEXT I SCENT I- I CSKCBc-CO lICK I I, ROCK-~c Alliii II JfpgTiC rI ICSONOOK PSFT IllsP5060110 0* FROB 106F0OOSKICK 0300 3~CO NKKKCOAIE01ItQS3i l&LCMCOCOBCCSOKSAL FIN SINK OKOCCISO ICSO0 PLOICSPLO0-00' r OCIKOO3KL573 OC OKKOKII OOEKLOCOSIK I..KOONlFS2PLO ICC SOUK 04013 pOKOOmI 40530 TMOSOKKL Naturally enough Don felt should seek aircraft similar layout Phoenix Zlin 526 726 series offered variety designs somewhat like Phoenix low-wing long-tail moment vehicles slightly swept wings Just finding full-scale aerobatic bird lines along success ful model design going enough however arrive winning design totally new event purpose avoid model flying characteristics stress scale realism decided go large light Large add realism presentation ease attitude recognition pilot judge Also large add drag slower flight again realism also help keep airplane 1200 box maneuvers performed Light weight considered essential vertical performance minimizing wing loading would allow sharp square comers flaps Another advantage light weight aerobatic aircraft Seen rear color-scheme lines emphasize feeling forward motion tenna strung stabilizer tip 12 Model Aviation Well-executed nose cowling really mean much Details ot tibergiass cowi snow up we. shotnote handling 4.m asn4 tho *sonInn Mir nnnnmnfl Just another picture provide another eyeview sne color scneme 11101 IS unarime Brown no Ice Mnlc fInuthrnusnl mumfflsr FULL SIZE PLANS AVAILABLE SEE PAGE 128 AICASONS LOAPJC/KAILWAASE7$5/SKOAKL PSOAOPCO oocsocxPSCMSATSSIALCCT n5/NACENT SAC III I S/SFLAT TOP SSAOSOLrCI S/A ISOCK 50 P55COMAI/ASPASTAPESS ACAS STACK SPACES/L/5S/SEALKM /LOS OP S/TA SCT P575555 ALLSACA SOOT ASK CT1 COT SACS/SBEAPtATPS SANK STACK1-U ACTAC PAN SCAM MASKS SAS TON ONE COLT AK/Sot5Ao5~OS MONET - X SET *I-2PM51 SAra S/lA SONTAIIfiAAA1AM NE iS/IA CSIAL-0515451C jF 05/IS ACAECttP tIZVCN II /S/ AGEMACAT POAS COATCCCNACCS~ SACASOC OCITSJ PANEL/Cl PS SIS/INOS ICS1/AMALSOp55 PCS 5/5505/SPM/CPBS MELLC PA ACCOLH OAMCS~ SOMI I/A SNUASO I I/S PCCI/A CCC Ii~2F /6II-I/-6-/vII//OSSOASK ACOOCENLACACICS OPI X KOCCOAOKkC /0 POSECCOK NOES _____________________________________________ III ThI jO fli AI EL PM II/A A/ALE MOCCA MO/NTCUT FRAN/NPUSECSOE ASKS IK SESOLOSCEKTSICK/AC PLO 00/MAPS/NO SOEKC IT IPASACNRO lASS PEAPSACALPSKLTION 00 I/S MACSMPTACONPSO7T- NOKOSjS/AC SOAPS rIIU/SSSOAAK~~ I/AS/C/ASS0I U[I II pIFS / H0500050/SC C/SPATS NOCCIOMA010 1/SOPLO1/ [ CUCTACAC 5/ASCOEC I I/N So/SECSET KACM/SF jMgj0I/SPLO5~ ISN-IS I/SNCUOSE] NLAOS CANE II / MOSPANI I/SN/C/COCKI/SM/AIOiMSj-ACOAS ~CUASE S SUNKCUT PACM I/S N/SECI II/MM/TO/CNL ASK CANOPY SE/CP1no 0550 CASASSICTS N/ASS/SN I CKASNKSO PLACE ----S often overlooked reduction inertia property also opposes cessation characteristics exactly what dont want angular moments inertia rotation airplane already rotating event precision point rolls snap An angular moment inertia mass property other words airplane high angular rolls required 3T maneuvers aircraft oppotes its rotation about moment inertia roll hard start rolling keeping structural weight absolute either its yaw pitch roll axis same difficult stop rolling once starts minimum could reduce moments February 1980 13 I I unsandL A/SSBCONAC /SSASSAC US SEA resmivemy simpie details complete tail detaches two separate pieces SACS ISS/odS 555 SES/Sy uc aeparaoeo orom inc stanhlizer reattached fuselage dowel two screws Facilitates transport i ysHIToo rU L 5QUARE RETRACT BEAM OUT TO BLOCS PLODD 5H0W 0 Up d\m ALTERNATE WING CONSTRUCTiON IS 3/3Z BALSA RIBS WITH SAME SPARS LEADING TRAILING EDGES 3/32 SHEET FRONT CECKING AEROCOMPOSITE CANOPY RUDDER & ELEVAlOR NYRODS TO SERVOS 3/8 BALSAN MIDDLE FAIRLEAD 6CKTO TAlL FOUR NO 2 SCREWS SECURE COWLING TO FUSELAGE I/8PIWJOD GUSSETS lOP AND BOTTOM WEBRA 91 ENGINE 2 3/4DIA- SPINNER AEROCOMPOSITES COWLING SCALE TO FIT 1/2 MAPLE ENGINE MOUNT . RECHESlOF-2 2 1/32 PLYWOOD FUSELAGE DOUBLER FROM F-I BELLY N IS CEMENTED 10 BOlTOM OF WING FIRST -24 SCREWS TO SECURE WING THRU 5/8 DOWELS 3A6 DOWELS IMBED INlO FOAM TO ANCHOR L G I/4 PLYVOD PLATFORM FOAM CORE IN RUDDER AND FIN II/4X3/4TE /16 PLYWXfl BOX3/16 X 1/4 FIN POSTI ENCASES STABILIZER1/16 SHEETING 5A6 DOWELS LOCKBALSA RUDDER FOST 1N TO FUSELAGE 3 /8 SQTOP ANDALL SCREWS HERE 3011DM FAIRLEAD 5/ 1600 WELFOR HORN 4-40 SCREWS MOUNT FIN BASETO BOX 4 BALSA DORSAL FOAM CORES / // WS I\~IssFiNPOST /GOLDBERG1/4 X 1/2 BALSA STABLIZER LE 5/16 DOWEL- 3/32 HOLE FOR HORN 1 1/2 DIA TAILWHEEL 1/4 SQ DIAGONALS 1/8 BALSA SIDE RINELS F-I 10 TAL3/16u X 3/8 BOTTOM KEEL V4SQ BOTTOM LONGERONS 10-24 REAR WING HOLD SCREVJS ThRJ 5/8DOWELS 1/8 MUSIC WIRE TOI/I& SHEET BALSATOP AND BOTfOM AILERON SERVOSV16 X 1/4 CAP STRIPS OVER FOAM 1 1/2 TRAILING EDGE STOCK DOUBLED FOR AILERONS 2 RETRACTABLE BELLCRANK ON 1/8 PLYWOOD PLATFOFA 1/4 X BALSA LEADING EDGEHOLLOWED BALSA BLOCK 3DIA MAIN WHEELS SOUTHERN RETRACT SYSTEM FROM SERVO POWER ONLY February 1980 15 1/4 HARD BALSA SPAR FRONT AND REAR TOP AND BCIlTCM inertia insure crisp totally controllable rotations aircraft about its axes finally settled Zlin 526 AS basis project 526 AS singleplace aerobatic low wing faired-in canopy in-line engine wing fairly high aspect ratio implies good roll damping leading edge swept straight trailing edge resulting wing sweep about 4 degrees Thrust line wing horizontal tail separated vertically very much usually means control coupling less likely Vertical tail size large enough scale directly horizontal tail size increased span chord maximum allowable 15% scale engine cowl allowed very neat inverted instal lation Webra 91 chosen power Finally retractable landing gear real aircraft allowed us include feature model well course airplane can improved made some subtle changes within rules hopes achieving model would fly con siderably better true scale replica Sym metrical airfoils substituted wing shortened its aspect ratio reduced widening tip chord wing also moved forward inch lengthen tail moment improve balance thrust line horizontal tail lowered wing raised slightly order bring surfaces nearly line thrust vector width fuselage reduced 15% canopy moved forward inch help knifeedge flight Strip ailerons substituted full-size aircrafts conventional ones horizontal tail increased chord span improve tail volume coefficient other aspects aircraft true scale very close including fuselage cross section aircraft sized 950 sq well over minimum quite bit smaller some other airplanes turned up Vegas weight goal set 9 pounds achieved would result excellent vertical per formance Webra 91 first version built-up wing vertical fin second 526 AS built Steve Rojecki foam wing cut out resemble rib structure added balsa spars sheeting wound up open framework foam wing closely resembling built-up version Both airplanes MonoKote Solar Film covered Epoxypainted fiberglass cowls custom molded canopies added complete vehicles both weighed 8 pounds ready fly minus fuel Initial flights both aircraft very encour aging obvious efforts achieve low angular inertia minimum weight paid off Square corners sharp clean precise starting stopping rolling maneuvers successfullly accomplished airplane fast highly desirable quality flying nearly constant speed high drag large airframe slowed down dives engine pulled vertically little sag due its low 16 Model Aviation Aft fuselage detail showing dowel holes screws attaching tail section Rudder pushrod attaches internally tail-wheel arm steering Larger size models permit flexibility structural design Underside detachable tail Three large holes pruvue eiuu tu ue screws attach fin stabilizer Two holes rear screws attach entire unit fuselage Using Southern RC retractswith Fox wheelsgear swings aft rather sideways duplicate retractable function real craft Servo installation wing aileron servo rear retract servo forward Bands hold screws place fuselage equipment bay dwarfs servo tray receiver forward batteries located under servo tray Note pushrods aluminum tubing weight reliability inside outside snapping maneuvers improved moving center gravity back its current location shown plans snaps also enhanced wing itself airfoil gets thinner toward tip leading edge sharpens outboard Both airplanes flown 1978 Tourn ament Champions new Prototype Pattern original built author flown 14th place finish Don Lowe other built Steve Rojecki flown Steve capacity pattern demonstration flier Steve competitor flew full pattern before judges during training beginning round official flying idea establish base flight judges rather have react differently first few flights round Steve probably got assignment proven flying abilities also because rare individual invited competitor did have qualified airplane event As case new events rules Vegas Prototype Pattern provisional subject change improvement based success first event rules changed 1980 Zlin 526 AS pre sented no longer eligible Vegas too small now minimum size mono plane has increased 1100 sq since Vegas invitational event limited about 25 select competitors unlikely would have built purpose Zlin 526 AS remains attractive model stand-off scale events 60 91 offers exciting bonus full aerobatic capability Construction Its always best tackle toughest building chore first. Normally means wing case fuselage rates first attention fuselage complicated its simulation real airplanes fabric covered longeron structure its provisions removable tail section tail separates fuselage make transporting airplane easier vertical fin may attached fuselage horizontal installed some reason wanted transport fuselage intact elevator halves sticking out happen have ample vehicle like van station wagon dont plan ship airplane Nevada year recom mend build permanent fixed tail surfaces reduces complexity saves weight eliminating lot plywood get started fuselage bulkheads Fl F2 two motor mounts 1/4 sq cross brace 1/16 floor between bulkheads Fl F2 assembled unit using slow setting epoxy Bulkheads F3 through F7 built up sa overlapping corner joints Add doublers join fuselage halves bulkheads F3 through F7 fuselage upside down flat building board aligned top view plans Add bulkheads F8 F9 after removing fuse lage board Before adding forward bulkhead unit epoxy aware fuselage sides will form hour glass top view unit added looks strange requires some good clamping possibly wet ting sides accomplish required order fair longeron-type aft fuselage struc ture smooth-sided nose structure Editors Note consider Zlin super aircraft skilled pilot wants something bit d/ferent special both personaiship heflies andfor highly realistic maneuvers can perform ft took little doing bring together Don Lowe Phoenix Marks given dashing off magazine projects developed design worked out Ken Don pooled wits ship built Ken pilot Lowe last saw Ken fly 1966 meet da4 Vince afellowRC oldtimer sur prised high level workmanship excellent writing long articleand would kits have such fine instructions Weve eliminate another article issue avoid diluting Kens copy top off Don Lowe did climactic commentay based upon piloting experiences basic fuselage box completed upper lower partial bulkheads added Next install 1/4 sq diagonal braces bottom fuselage add sq longerons point sq longerons top bottom edges fuselage sides glued place Fuselage top sheeting installed six pieces Two pieces 1/16 form turtledeck Four pieces 3/32 form top sheeting forward canopy Cross grain ting installed cockpit floor bottom nose after gas tank has installed Note Fuelproof entire gas tank compartment coat epoxy Add four pieces /4 balsa sheet two tail two above wing leading edge help fair longerons tailpost nose Cut wing saddles sheet glue fuselage Add ongerons fuselage sides epoxy plywood gussets strengthen motor mounts Before gluing om sheeting between F8 F9 tail wheel mount bolted F8 Also incorporating detachable tail ood plate should installed aft F9 back fuselage should faced 1/16 plywood flat surface removable tail sits covered 1/16 ply center has cut out aft section fuselage sanded such flat panels Monokote result covered flat upper enter ext center ower ower sq ower longeron finally / sq longeron middle 3/16 om central longeron t back fuselage beveled tapered fair sq longerons back tailpost t above wing leading edge faired sq wing saddle its rear edge feathered fuselage side its forward edge saddle sanded k its aft end about 3/16 thick its forward Continued page 102 February 1980 17 jetacnanie tail aetall shown align ment dowels parting line between vertical fin horizontal tail Ken Bonnema displays bottom ship can admire its color schemebit wild what Looking Better Silicone Tubing LUE LINE Its Thicker Stronger Highly Heat Resis tant Flexible other fuel lines Whats moreBLUE LINE eith er equal lower price others So dont fooled Remember ask original BLUE LINE tubing Send SASE today free catalog fine products El O7kENZ2 44W Prospect St New Haven Conn 06515 PRODUCTS safety radio control flying club needs some system aasure two transmitters same frequency notturnedon same time An orderly system does much avoid looks panic shouting flight lineor worse Generation Products producing com plete set engraved high quality frequency pins club use pins check hoard flight line moments panic can avoided frequency pins made high quality engravers plastic sandwich-like con struction numbers engraved cutting through top layer plastic thereby exposing second layer No paint used no fading wearing away numbers pin contains frequency number also color-codedtO match theflags transmitter Construction pins first rate set should stand up club use considerable time period product review product review product review ZIin/ Bonnema continued page 1 7 edge meets t al fin sanded Monokoted glued after rest fuselage has Monokoted Epoxy wing hold-downs drill yet Wing plans show foam wing mainly cause much simpler build no weight penalty occurred between Rojeckis foam wing built up version original wing half should cut lb/cu ft density foam block least 5 inches thick blocks faced foam wire cutter insure square Align root tip templates block absolutely no twist include dihedral raising centerline tip rib 070 inches above centerline root rib Locate root rib exact same place both blocks wing halves may joined blocks flat surface later Cut out core including spar notches using hot-wire bow Number rib templates before hand equal chord percentage segments hot wire may drawn past identical chord stations times both root tip templates After cores have cut blocks cut Out two templates cardboard thin plywood cutouts cores Place cores back blocks sandwich together place template side cut open areas push piece 1/16 music wire through spaces cut out Slip center-drilled piece l rod over end wire attach current regulated hot leads outside dowels Holding new hot wire wooden dowels run around inside templates thus cutting out area removed Repeat procedure cutout area Tapered spars cut very hard a glued cores Titebond epoxy Keep cores blocks weighted flat surface spars dry Next cut out landing gear unit clearance wheel wells servo boxes linkage channels copper wire forms placed heavy duty soldering gun Epoxy landing gear mounting plates 4-40 blind nuts already installed plates have four 3/16 dowels pro truding down foam extra gluing area added strength Glue bellcrank mounts install bellcranks landing gear linkage Sheet center section leading edge trailing edge 1/16 balsa sheet Slow setting epoxy sparingly applied balsa recommended Spreading epoxy foam does improve bond does add considerable weight Again set cores back blocks weight flat surface sheeting drying After sheeting dry trim excess sand flush foam Add tip blocks 3/16 trailing edge ing edge cap strips Remove sheeting has covered wheel well landing gear cavity Join wing halves flat surface epoxing center section both halves resting foam blocks Weight allow adequate time epoxy set up Ailerons laminated two pieces 1 trailing edge stock glued together longest surface longest surface leading edge bevel get quite enough must sanded allow sufficient aileron throw dowel drilled embedded aileron near root aileron horns essential An experiment 3/32 wire resulted aileron flutter fixed portion wing trailing edge lying between two ailerons laminated balsa sheet Clearance notched front piece Install aileron horn wires brass nylon guides before gluing central trailing edge section Drill holes clear through wing epoxy four ls have drilled through 3/16 wing bolts Sand flush upper lower surfaces wing reinforce wing center section wrap first layer 7-oz fiberglass cloth layer 2oz cloth Drill through hardened fiberglass open wing bolt holes Set wing fuselage align very carefully Run long 3/16 drill through bolt holes already wing drill through plywood wing mounting plates fuselage Remove wing enlarge holes fuselage plates install 10-24 blind nuts Bolt wing fuselage build up belly pan aligns perfectly fuselage Use paper tubes bolt guides through belly pan Cut away fiberglass balsa sheet covering servo box install rails aileron retract servos Rib spacing built up wing shown plans Using tip root templates provided sandwich 15 pieces 3/32 baisa between templates sand stack down form ribs wing half Spar location size un changed foam wing Leading edge trailing edge sheeting cap strips also un changed 1/16 balsa vertical grain spar webbing glued between ribs both front rear spars landing gear mount system shown can used ribs either side must reinforced plywood Wheel wells must built up 1/16 balsa sheet Ailerons tips center section including fiberglass reinforcement unchanged Tail Surfaces Foam cores vertical fin rudder stabilizer elevator cut using templates provided 1 / 16 sheeting epoxied wing surfaces left dry weighted foam blocks flat table Leading trailing edges tip blocks glued after sheeting has trimmed sanded Note 3/16 vertiial fin trailing edge exception glued foam core before sheeting sheeting overlaps Elevators rudder have l installed drilled 3/32 wire control horn joined stabilizer halves wrapped fiberglass cloth shown plans fol lowing steps must adhered 102 Model Aviation Available im 5 sizes fit appli cation about 59 per ft Shown above SUPER BLUE set upwith extra-large tubing 4 reusable ties & end-of-line nozzles $369 per pkg nrnrIiut review nrnduat review nrnduat review Frequency Pins @ $2500/ set Generation Pro ducts Co. Inc. 5512 Southwood Little Rock AR 72205 incorporating removable tail Spot glue mating piece 1/16 ply top plywood tail mounting surface fuselage upper piece should about shorter fuselage piece front edge piece glue another piece 1/16 ply matches upper middle quarter F8 including two 3/16 dowel holes Insert two 3/16 dowels through holes glue plywood floor glue dowels F8 back edge plywood floor glue F9A balsa Glue a lower saddles stabilizer Align stabilizer carefully glue saddles Glue a upper stabilizer saddles cap top saddles 1/16 plywood should now have box structure completely surrounding stabilizer plywood bottom top front balsa back break fuselage yet Spot glue another piece 1/16 plywood top box structure front edge piece glue piece plywood matches uppermost portion F8 including 3/16 dowel hole Also glue two blocks ood top plywood floor shown plans Drill 4-40 clearance hole through center front block clear through stabilizer box Drill two 4-40 clearance holes through rear block again clear through stabilizer box Enlarge three holes ply blocks install 4-40 blind nuts Insert piece 3/16 dowel through its hole glue plywood floor glue dowel F8 Now spot glue piece ood original 1/16 plywood tail mounting surface half-inch space left open behind stabilizer box k should fill entire space should 1/16 short width both sides Drill two 4-40 clearance holes through block through corresponding block fuselage underneath Enlarge holes upper block install two 4-40 blind nuts Now glue piece 1/16 plywood matches back face stabilizer box ood piece just installed 1/16 plywood floor spot glued top stabilizer box glue piece stabilizer box Now take sheeted vertical fin its extended hinge line post cut clearance bottom two plywood blind nut blocks 3/16 dowel mounted upper plywood floor Trim rudder post just contacts plywood blind nut block behind stabilizer box trim vertical fin sheeting fits over outside edges plywood block lines up fueslage sides Glue vertical fin upper plywood floor plywood pieces behind stabilizer box careful glue vertical fin assembly stabilizer box Glue sandtwo balsa blocks fair vertical fin F8 Finally add a dorsal fin assembly dry separate vertical fin assembly fuselage stabilizer box using razor blade break spot glue joints separate stabilizer box fuselage same way Enlarge three holes stabilizer box its lower side holes should opened up lower plywood floor stablizer itself enlarge holes upper plywood cap Glue paper straws act screw guides Now can sit back relax curse yourself building fixed tall fix tail surfaces simply eliminate plywood pieces enlarge balsa pieces accordingly glue everything together permanently Finishing Monokote Solar Film strongly recommended materials closely simulate fabric covering full-scale airplane offer lightest overall weight complete finish fiberglass engine cowl molded cellu lose acetate canopy available Aero composites Corp 411 Townsend Place Dayton 0hio4543 1 cowl frameworkmolded canopy painted match Mono kote colors used paint scheme OK WKE represents Czechoslovakian Team colors other airplane shown done British Aerobatic Team colors Since countries fly Zlin large variety color scheme options choose Installation Radio installation fairly straight forward use 60 stow flight pack battery above gas tank 91 locate battery above servo tray further aft necessary achieve proper CG receiver foam wrapped sits fuselage bay just front servo tray Aileron retract linkage shown drawings plans show independent control horns elevator half require pushrod exits rear fuselage both sides M alternative elevator halves may joined central horn single pushrod concealed fuselage rudder pushrod may attached internally tail wheel steering arm before exits fuselage side its way back rudder Flying 526 AS Zlin designed high-performance machine capable perform ing AMA FAI Vegas Tournament maneuvers Flying aircraft pure pleasure difficult considering its very high performance potential Takeoffs piece 104 Model Aviation Please send mecopies new 5th edition Radio Control Buyers Guide Enclosed $825 copy ordered $725 retail plus $100 postage & handling City State ZIP Return RC Buyers Guide Clifton House Clifton VA 22024 Purchasing R/C Aircraft easy YOUNIQUE AT Hobby Capitol keep large ready supply Custom-But RC Aircraft Kits Engines RC Units times And. thanks years experience dealing people sections US. prepare special one-of-a-kind RC Aircraft special one-ofa-kind RC flyer demands unique look express tastes Chances youll find custom paint finish exquisite detailed cockpit interiors glassed engine compartments real scale wheels custom grilled nose section will knock socks offi l probably never see another like cause Hobby Capitol expert stressed preparation goes far beyond standard checkout RC shoppers turning up increasing numbers convenient showroom because word out. outstanding buys service finest selection unique RC Aircraft anywhere its HOBBY CAPITOL Old Ignition Trade-in Buy sell old time ignition engines Box up what yau have send us honest appraisal could worth new proportional set have engines can also start collection welcome built-up airplanes used proportionals old time ignition engines Come trade us Top dollar Custom-1311t-RjC Built Order Plans Ft stock choose Its s40000 PIp TrI-Pocm Quorter-ale 89 wingspan 42 Sq Ft detajied dans $1699 PP nd $100 self addressed stomped envelope detoiled list Built-Up R/C Models 50% Sole Hobby Capitol 46 N Oak St Ventura CA 93001 Phone 805 643-7616 642-8465 cake Landings require little care prevent tip stall still very slow generous wing area would recommend drag nose high however Super docile land ings could achieved some sacrifice snapping capability blunting wing leading edge toward tip can play its performance potential starting forward CG slowly moving back improve snapping roll characteristics used fairly aft CG location get very best performance snaps rolls also worked bit wing incidence engine thrust line zero-zero set up works well little bit engine right thrust ease torque effects Speaking torque Webra 91 pulls aircraft along ease using 14-6 7 prop used non-stock 60-size Perry pump carburetor Webra since will turn 10500 11000 carb prop choice becomes critical Vertical performance first thing suffer engine prop mismatched large high-drag airplanes like recommend very stiff torque pushrods throughout since control loads high will want use husky servos extremely tight centering resolution have found big ships rapid pot wear occurs servos tight due control loads increased control surface dither Fortunately will find large slow aircraft tolerant control dead-band high-speed pattern ships Im sure will especially appreciate very tight looping cornering capability Zlin large wing low wing loading will give spectacularly tight square loops Rolling maneuvers will require little work standard pattern ship due reduced airspeed smaller power loading somewhat shortcoupled design Youll find other large slower aircraft require increased proficiency rudder part pilot really feel will enjoy flying Zlin because combines realistic good looks fine aerobatic performance What could modeler ask Trans America Riches continued page 24 necessary know would no flying Wednesday made two Wed nesdays row After awards presentation motel Meridian team first 3 minutes ahead number 2 Montgomery team officials off Jackson MS start next leg high winds bothering Riches pick up worse Saggin Wagon AMA motorhome Bob Roach drove bad left rear spring causing perpetual lean hence Saggin Wagon weather clearing Jackson reports pretty good next morning didnt help Jimmy Grier tonight Three team members airplanes still Chicago Jerry Nelson have Jackson already planes Hurricane Frederick delayed slightly would early next morning Doc Edwards Jimmy takeoff area early rest Team 3 BTHOOM Team wasnt Jimmys Cessna somewhere between Chicago Jackson didnt look good though up until around 2 am fixing Docs truck pilot vehicle borrowed lead vehicle didnt look BTHOOM team going make alone ask what BTHOOM team Jimmy Grier asked what name team replied after slight delay Beats Hell Out other four teams off away frontage road takeoff area still no planes Jimmys team no rest team did arrive frantic rush get ready air being taped TV crew arrived late teams ran close part leg passing other pit stops teams good times team work payed off though three planes crashed Everyone ready takeoff West Monroe LA mayor hand see planes off police help teams get through traffic lights onto freeway fire department added nice touch hot coffee everyone Bob Roach much happier now wife Sue joined him Jackson would take care selling chances Pitts Special souvenirs rest trip As usual days flights uneventful Murphys Law again teams close coming Sharks field Bossier City LA Shreveport club big recep tion barbecue ready police escort freeway field big help did cause some confusion Doc Edwards trying get lead vehicle ahead guide Team 3s pilot vehicle landing area police car raced past going other direction siren wailing lights flashing police car made abrupt U-turn Doc jammed brakes let pass As Doc watching pull alongside thought bought sure policeman leaned Out window big sweeping motion arm yelled Cmon lets make Doc told Doris little later lucky have coronary Team 5 Sharks Club team fittingly received champagne first team top honors leg Shreveport John Embry AMA VP District VIII Ba Kinch Lake Charles club joined race CDs volunteered fill last minute vacancies leg Bo continue Abilene TX help out flight Shreveport Dallas long makes pit stops possible trouble Out five started Kellys Truck Stop morning four made no normal number problems broken props bent landing gears deadstick landings lost hatches crash two addition morning briefings Dont wear race hats back pilot vehicles tying Because no going lose valuable time retrieving race route well marked lost blue-and-white hats flight Mesquite Model Field Ft Worth uneventful five planes made short flight about 50 miles good time high point takeoff Mesquite reading proclamation mayor Dallas AMA past president Johnny Clemens along mayor pro tem Mesquite gave planes good send off landing Tarrant County Junior College landing area Fort Worth Jim Simpsons Southwest Modelers RC Club team least number problems took first place hardware three half minutes ahead John Kikers NASA Flyers Houston takeoff Ft Worth Wednesday 106 Model Aviation
Edition: Model Aviation - 1980/02
Page Numbers: 10, 11, 12, 13, 14, 15, 16, 17, 102, 104, 106
NO OCR TEXT NO OCR TEXT I SCENT I- I CSKCBc-CO lICK I I, ROCK-~c Alliii II JfpgTiC rI ICSONOOK PSFT IllsP5060110 0* FROB 106F0OOSKICK 0300 3~CO NKKKCOAIE01ItQS3i l&LCMCOCOBCCSOKSAL FIN SINK OKOCCISO ICSO0 PLOICSPLO0-00' r OCIKOO3KL573 OC OKKOKII OOEKLOCOSIK I..KOONlFS2PLO ICC SOUK 04013 pOKOOmI 40530 TMOSOKKL Naturally enough Don felt should seek aircraft similar layout Phoenix Zlin 526 726 series offered variety designs somewhat like Phoenix low-wing long-tail moment vehicles slightly swept wings Just finding full-scale aerobatic bird lines along success ful model design going enough however arrive winning design totally new event purpose avoid model flying characteristics stress scale realism decided go large light Large add realism presentation ease attitude recognition pilot judge Also large add drag slower flight again realism also help keep airplane 1200 box maneuvers performed Light weight considered essential vertical performance minimizing wing loading would allow sharp square comers flaps Another advantage light weight aerobatic aircraft Seen rear color-scheme lines emphasize feeling forward motion tenna strung stabilizer tip 12 Model Aviation Well-executed nose cowling really mean much Details ot tibergiass cowi snow up we. shotnote handling 4.m asn4 tho *sonInn Mir nnnnmnfl Just another picture provide another eyeview sne color scneme 11101 IS unarime Brown no Ice Mnlc fInuthrnusnl mumfflsr FULL SIZE PLANS AVAILABLE SEE PAGE 128 AICASONS LOAPJC/KAILWAASE7$5/SKOAKL PSOAOPCO oocsocxPSCMSATSSIALCCT n5/NACENT SAC III I S/SFLAT TOP SSAOSOLrCI S/A ISOCK 50 P55COMAI/ASPASTAPESS ACAS STACK SPACES/L/5S/SEALKM /LOS OP S/TA SCT P575555 ALLSACA SOOT ASK CT1 COT SACS/SBEAPtATPS SANK STACK1-U ACTAC PAN SCAM MASKS SAS TON ONE COLT AK/Sot5Ao5~OS MONET - X SET *I-2PM51 SAra S/lA SONTAIIfiAAA1AM NE iS/IA CSIAL-0515451C jF 05/IS ACAECttP tIZVCN II /S/ AGEMACAT POAS COATCCCNACCS~ SACASOC OCITSJ PANEL/Cl PS SIS/INOS ICS1/AMALSOp55 PCS 5/5505/SPM/CPBS MELLC PA ACCOLH OAMCS~ SOMI I/A SNUASO I I/S PCCI/A CCC Ii~2F /6II-I/-6-/vII//OSSOASK ACOOCENLACACICS OPI X KOCCOAOKkC /0 POSECCOK NOES _____________________________________________ III ThI jO fli AI EL PM II/A A/ALE MOCCA MO/NTCUT FRAN/NPUSECSOE ASKS IK SESOLOSCEKTSICK/AC PLO 00/MAPS/NO SOEKC IT IPASACNRO lASS PEAPSACALPSKLTION 00 I/S MACSMPTACONPSO7T- NOKOSjS/AC SOAPS rIIU/SSSOAAK~~ I/AS/C/ASS0I U[I II pIFS / H0500050/SC C/SPATS NOCCIOMA010 1/SOPLO1/ [ CUCTACAC 5/ASCOEC I I/N So/SECSET KACM/SF jMgj0I/SPLO5~ ISN-IS I/SNCUOSE] NLAOS CANE II / MOSPANI I/SN/C/COCKI/SM/AIOiMSj-ACOAS ~CUASE S SUNKCUT PACM I/S N/SECI II/MM/TO/CNL ASK CANOPY SE/CP1no 0550 CASASSICTS N/ASS/SN I CKASNKSO PLACE ----S often overlooked reduction inertia property also opposes cessation characteristics exactly what dont want angular moments inertia rotation airplane already rotating event precision point rolls snap An angular moment inertia mass property other words airplane high angular rolls required 3T maneuvers aircraft oppotes its rotation about moment inertia roll hard start rolling keeping structural weight absolute either its yaw pitch roll axis same difficult stop rolling once starts minimum could reduce moments February 1980 13 I I unsandL A/SSBCONAC /SSASSAC US SEA resmivemy simpie details complete tail detaches two separate pieces SACS ISS/odS 555 SES/Sy uc aeparaoeo orom inc stanhlizer reattached fuselage dowel two screws Facilitates transport i ysHIToo rU L 5QUARE RETRACT BEAM OUT TO BLOCS PLODD 5H0W 0 Up d\m ALTERNATE WING CONSTRUCTiON IS 3/3Z BALSA RIBS WITH SAME SPARS LEADING TRAILING EDGES 3/32 SHEET FRONT CECKING AEROCOMPOSITE CANOPY RUDDER & ELEVAlOR NYRODS TO SERVOS 3/8 BALSAN MIDDLE FAIRLEAD 6CKTO TAlL FOUR NO 2 SCREWS SECURE COWLING TO FUSELAGE I/8PIWJOD GUSSETS lOP AND BOTTOM WEBRA 91 ENGINE 2 3/4DIA- SPINNER AEROCOMPOSITES COWLING SCALE TO FIT 1/2 MAPLE ENGINE MOUNT . RECHESlOF-2 2 1/32 PLYWOOD FUSELAGE DOUBLER FROM F-I BELLY N IS CEMENTED 10 BOlTOM OF WING FIRST -24 SCREWS TO SECURE WING THRU 5/8 DOWELS 3A6 DOWELS IMBED INlO FOAM TO ANCHOR L G I/4 PLYVOD PLATFORM FOAM CORE IN RUDDER AND FIN II/4X3/4TE /16 PLYWXfl BOX3/16 X 1/4 FIN POSTI ENCASES STABILIZER1/16 SHEETING 5A6 DOWELS LOCKBALSA RUDDER FOST 1N TO FUSELAGE 3 /8 SQTOP ANDALL SCREWS HERE 3011DM FAIRLEAD 5/ 1600 WELFOR HORN 4-40 SCREWS MOUNT FIN BASETO BOX 4 BALSA DORSAL FOAM CORES / // WS I\~IssFiNPOST /GOLDBERG1/4 X 1/2 BALSA STABLIZER LE 5/16 DOWEL- 3/32 HOLE FOR HORN 1 1/2 DIA TAILWHEEL 1/4 SQ DIAGONALS 1/8 BALSA SIDE RINELS F-I 10 TAL3/16u X 3/8 BOTTOM KEEL V4SQ BOTTOM LONGERONS 10-24 REAR WING HOLD SCREVJS ThRJ 5/8DOWELS 1/8 MUSIC WIRE TOI/I& SHEET BALSATOP AND BOTfOM AILERON SERVOSV16 X 1/4 CAP STRIPS OVER FOAM 1 1/2 TRAILING EDGE STOCK DOUBLED FOR AILERONS 2 RETRACTABLE BELLCRANK ON 1/8 PLYWOOD PLATFOFA 1/4 X BALSA LEADING EDGEHOLLOWED BALSA BLOCK 3DIA MAIN WHEELS SOUTHERN RETRACT SYSTEM FROM SERVO POWER ONLY February 1980 15 1/4 HARD BALSA SPAR FRONT AND REAR TOP AND BCIlTCM inertia insure crisp totally controllable rotations aircraft about its axes finally settled Zlin 526 AS basis project 526 AS singleplace aerobatic low wing faired-in canopy in-line engine wing fairly high aspect ratio implies good roll damping leading edge swept straight trailing edge resulting wing sweep about 4 degrees Thrust line wing horizontal tail separated vertically very much usually means control coupling less likely Vertical tail size large enough scale directly horizontal tail size increased span chord maximum allowable 15% scale engine cowl allowed very neat inverted instal lation Webra 91 chosen power Finally retractable landing gear real aircraft allowed us include feature model well course airplane can improved made some subtle changes within rules hopes achieving model would fly con siderably better true scale replica Sym metrical airfoils substituted wing shortened its aspect ratio reduced widening tip chord wing also moved forward inch lengthen tail moment improve balance thrust line horizontal tail lowered wing raised slightly order bring surfaces nearly line thrust vector width fuselage reduced 15% canopy moved forward inch help knifeedge flight Strip ailerons substituted full-size aircrafts conventional ones horizontal tail increased chord span improve tail volume coefficient other aspects aircraft true scale very close including fuselage cross section aircraft sized 950 sq well over minimum quite bit smaller some other airplanes turned up Vegas weight goal set 9 pounds achieved would result excellent vertical per formance Webra 91 first version built-up wing vertical fin second 526 AS built Steve Rojecki foam wing cut out resemble rib structure added balsa spars sheeting wound up open framework foam wing closely resembling built-up version Both airplanes MonoKote Solar Film covered Epoxypainted fiberglass cowls custom molded canopies added complete vehicles both weighed 8 pounds ready fly minus fuel Initial flights both aircraft very encour aging obvious efforts achieve low angular inertia minimum weight paid off Square corners sharp clean precise starting stopping rolling maneuvers successfullly accomplished airplane fast highly desirable quality flying nearly constant speed high drag large airframe slowed down dives engine pulled vertically little sag due its low 16 Model Aviation Aft fuselage detail showing dowel holes screws attaching tail section Rudder pushrod attaches internally tail-wheel arm steering Larger size models permit flexibility structural design Underside detachable tail Three large holes pruvue eiuu tu ue screws attach fin stabilizer Two holes rear screws attach entire unit fuselage Using Southern RC retractswith Fox wheelsgear swings aft rather sideways duplicate retractable function real craft Servo installation wing aileron servo rear retract servo forward Bands hold screws place fuselage equipment bay dwarfs servo tray receiver forward batteries located under servo tray Note pushrods aluminum tubing weight reliability inside outside snapping maneuvers improved moving center gravity back its current location shown plans snaps also enhanced wing itself airfoil gets thinner toward tip leading edge sharpens outboard Both airplanes flown 1978 Tourn ament Champions new Prototype Pattern original built author flown 14th place finish Don Lowe other built Steve Rojecki flown Steve capacity pattern demonstration flier Steve competitor flew full pattern before judges during training beginning round official flying idea establish base flight judges rather have react differently first few flights round Steve probably got assignment proven flying abilities also because rare individual invited competitor did have qualified airplane event As case new events rules Vegas Prototype Pattern provisional subject change improvement based success first event rules changed 1980 Zlin 526 AS pre sented no longer eligible Vegas too small now minimum size mono plane has increased 1100 sq since Vegas invitational event limited about 25 select competitors unlikely would have built purpose Zlin 526 AS remains attractive model stand-off scale events 60 91 offers exciting bonus full aerobatic capability Construction Its always best tackle toughest building chore first. Normally means wing case fuselage rates first attention fuselage complicated its simulation real airplanes fabric covered longeron structure its provisions removable tail section tail separates fuselage make transporting airplane easier vertical fin may attached fuselage horizontal installed some reason wanted transport fuselage intact elevator halves sticking out happen have ample vehicle like van station wagon dont plan ship airplane Nevada year recom mend build permanent fixed tail surfaces reduces complexity saves weight eliminating lot plywood get started fuselage bulkheads Fl F2 two motor mounts 1/4 sq cross brace 1/16 floor between bulkheads Fl F2 assembled unit using slow setting epoxy Bulkheads F3 through F7 built up sa overlapping corner joints Add doublers join fuselage halves bulkheads F3 through F7 fuselage upside down flat building board aligned top view plans Add bulkheads F8 F9 after removing fuse lage board Before adding forward bulkhead unit epoxy aware fuselage sides will form hour glass top view unit added looks strange requires some good clamping possibly wet ting sides accomplish required order fair longeron-type aft fuselage struc ture smooth-sided nose structure Editors Note consider Zlin super aircraft skilled pilot wants something bit d/ferent special both personaiship heflies andfor highly realistic maneuvers can perform ft took little doing bring together Don Lowe Phoenix Marks given dashing off magazine projects developed design worked out Ken Don pooled wits ship built Ken pilot Lowe last saw Ken fly 1966 meet da4 Vince afellowRC oldtimer sur prised high level workmanship excellent writing long articleand would kits have such fine instructions Weve eliminate another article issue avoid diluting Kens copy top off Don Lowe did climactic commentay based upon piloting experiences basic fuselage box completed upper lower partial bulkheads added Next install 1/4 sq diagonal braces bottom fuselage add sq longerons point sq longerons top bottom edges fuselage sides glued place Fuselage top sheeting installed six pieces Two pieces 1/16 form turtledeck Four pieces 3/32 form top sheeting forward canopy Cross grain ting installed cockpit floor bottom nose after gas tank has installed Note Fuelproof entire gas tank compartment coat epoxy Add four pieces /4 balsa sheet two tail two above wing leading edge help fair longerons tailpost nose Cut wing saddles sheet glue fuselage Add ongerons fuselage sides epoxy plywood gussets strengthen motor mounts Before gluing om sheeting between F8 F9 tail wheel mount bolted F8 Also incorporating detachable tail ood plate should installed aft F9 back fuselage should faced 1/16 plywood flat surface removable tail sits covered 1/16 ply center has cut out aft section fuselage sanded such flat panels Monokote result covered flat upper enter ext center ower ower sq ower longeron finally / sq longeron middle 3/16 om central longeron t back fuselage beveled tapered fair sq longerons back tailpost t above wing leading edge faired sq wing saddle its rear edge feathered fuselage side its forward edge saddle sanded k its aft end about 3/16 thick its forward Continued page 102 February 1980 17 jetacnanie tail aetall shown align ment dowels parting line between vertical fin horizontal tail Ken Bonnema displays bottom ship can admire its color schemebit wild what Looking Better Silicone Tubing LUE LINE Its Thicker Stronger Highly Heat Resis tant Flexible other fuel lines Whats moreBLUE LINE eith er equal lower price others So dont fooled Remember ask original BLUE LINE tubing Send SASE today free catalog fine products El O7kENZ2 44W Prospect St New Haven Conn 06515 PRODUCTS safety radio control flying club needs some system aasure two transmitters same frequency notturnedon same time An orderly system does much avoid looks panic shouting flight lineor worse Generation Products producing com plete set engraved high quality frequency pins club use pins check hoard flight line moments panic can avoided frequency pins made high quality engravers plastic sandwich-like con struction numbers engraved cutting through top layer plastic thereby exposing second layer No paint used no fading wearing away numbers pin contains frequency number also color-codedtO match theflags transmitter Construction pins first rate set should stand up club use considerable time period product review product review product review ZIin/ Bonnema continued page 1 7 edge meets t al fin sanded Monokoted glued after rest fuselage has Monokoted Epoxy wing hold-downs drill yet Wing plans show foam wing mainly cause much simpler build no weight penalty occurred between Rojeckis foam wing built up version original wing half should cut lb/cu ft density foam block least 5 inches thick blocks faced foam wire cutter insure square Align root tip templates block absolutely no twist include dihedral raising centerline tip rib 070 inches above centerline root rib Locate root rib exact same place both blocks wing halves may joined blocks flat surface later Cut out core including spar notches using hot-wire bow Number rib templates before hand equal chord percentage segments hot wire may drawn past identical chord stations times both root tip templates After cores have cut blocks cut Out two templates cardboard thin plywood cutouts cores Place cores back blocks sandwich together place template side cut open areas push piece 1/16 music wire through spaces cut out Slip center-drilled piece l rod over end wire attach current regulated hot leads outside dowels Holding new hot wire wooden dowels run around inside templates thus cutting out area removed Repeat procedure cutout area Tapered spars cut very hard a glued cores Titebond epoxy Keep cores blocks weighted flat surface spars dry Next cut out landing gear unit clearance wheel wells servo boxes linkage channels copper wire forms placed heavy duty soldering gun Epoxy landing gear mounting plates 4-40 blind nuts already installed plates have four 3/16 dowels pro truding down foam extra gluing area added strength Glue bellcrank mounts install bellcranks landing gear linkage Sheet center section leading edge trailing edge 1/16 balsa sheet Slow setting epoxy sparingly applied balsa recommended Spreading epoxy foam does improve bond does add considerable weight Again set cores back blocks weight flat surface sheeting drying After sheeting dry trim excess sand flush foam Add tip blocks 3/16 trailing edge ing edge cap strips Remove sheeting has covered wheel well landing gear cavity Join wing halves flat surface epoxing center section both halves resting foam blocks Weight allow adequate time epoxy set up Ailerons laminated two pieces 1 trailing edge stock glued together longest surface longest surface leading edge bevel get quite enough must sanded allow sufficient aileron throw dowel drilled embedded aileron near root aileron horns essential An experiment 3/32 wire resulted aileron flutter fixed portion wing trailing edge lying between two ailerons laminated balsa sheet Clearance notched front piece Install aileron horn wires brass nylon guides before gluing central trailing edge section Drill holes clear through wing epoxy four ls have drilled through 3/16 wing bolts Sand flush upper lower surfaces wing reinforce wing center section wrap first layer 7-oz fiberglass cloth layer 2oz cloth Drill through hardened fiberglass open wing bolt holes Set wing fuselage align very carefully Run long 3/16 drill through bolt holes already wing drill through plywood wing mounting plates fuselage Remove wing enlarge holes fuselage plates install 10-24 blind nuts Bolt wing fuselage build up belly pan aligns perfectly fuselage Use paper tubes bolt guides through belly pan Cut away fiberglass balsa sheet covering servo box install rails aileron retract servos Rib spacing built up wing shown plans Using tip root templates provided sandwich 15 pieces 3/32 baisa between templates sand stack down form ribs wing half Spar location size un changed foam wing Leading edge trailing edge sheeting cap strips also un changed 1/16 balsa vertical grain spar webbing glued between ribs both front rear spars landing gear mount system shown can used ribs either side must reinforced plywood Wheel wells must built up 1/16 balsa sheet Ailerons tips center section including fiberglass reinforcement unchanged Tail Surfaces Foam cores vertical fin rudder stabilizer elevator cut using templates provided 1 / 16 sheeting epoxied wing surfaces left dry weighted foam blocks flat table Leading trailing edges tip blocks glued after sheeting has trimmed sanded Note 3/16 vertiial fin trailing edge exception glued foam core before sheeting sheeting overlaps Elevators rudder have l installed drilled 3/32 wire control horn joined stabilizer halves wrapped fiberglass cloth shown plans fol lowing steps must adhered 102 Model Aviation Available im 5 sizes fit appli cation about 59 per ft Shown above SUPER BLUE set upwith extra-large tubing 4 reusable ties & end-of-line nozzles $369 per pkg nrnrIiut review nrnduat review nrnduat review Frequency Pins @ $2500/ set Generation Pro ducts Co. Inc. 5512 Southwood Little Rock AR 72205 incorporating removable tail Spot glue mating piece 1/16 ply top plywood tail mounting surface fuselage upper piece should about shorter fuselage piece front edge piece glue another piece 1/16 ply matches upper middle quarter F8 including two 3/16 dowel holes Insert two 3/16 dowels through holes glue plywood floor glue dowels F8 back edge plywood floor glue F9A balsa Glue a lower saddles stabilizer Align stabilizer carefully glue saddles Glue a upper stabilizer saddles cap top saddles 1/16 plywood should now have box structure completely surrounding stabilizer plywood bottom top front balsa back break fuselage yet Spot glue another piece 1/16 plywood top box structure front edge piece glue piece plywood matches uppermost portion F8 including 3/16 dowel hole Also glue two blocks ood top plywood floor shown plans Drill 4-40 clearance hole through center front block clear through stabilizer box Drill two 4-40 clearance holes through rear block again clear through stabilizer box Enlarge three holes ply blocks install 4-40 blind nuts Insert piece 3/16 dowel through its hole glue plywood floor glue dowel F8 Now spot glue piece ood original 1/16 plywood tail mounting surface half-inch space left open behind stabilizer box k should fill entire space should 1/16 short width both sides Drill two 4-40 clearance holes through block through corresponding block fuselage underneath Enlarge holes upper block install two 4-40 blind nuts Now glue piece 1/16 plywood matches back face stabilizer box ood piece just installed 1/16 plywood floor spot glued top stabilizer box glue piece stabilizer box Now take sheeted vertical fin its extended hinge line post cut clearance bottom two plywood blind nut blocks 3/16 dowel mounted upper plywood floor Trim rudder post just contacts plywood blind nut block behind stabilizer box trim vertical fin sheeting fits over outside edges plywood block lines up fueslage sides Glue vertical fin upper plywood floor plywood pieces behind stabilizer box careful glue vertical fin assembly stabilizer box Glue sandtwo balsa blocks fair vertical fin F8 Finally add a dorsal fin assembly dry separate vertical fin assembly fuselage stabilizer box using razor blade break spot glue joints separate stabilizer box fuselage same way Enlarge three holes stabilizer box its lower side holes should opened up lower plywood floor stablizer itself enlarge holes upper plywood cap Glue paper straws act screw guides Now can sit back relax curse yourself building fixed tall fix tail surfaces simply eliminate plywood pieces enlarge balsa pieces accordingly glue everything together permanently Finishing Monokote Solar Film strongly recommended materials closely simulate fabric covering full-scale airplane offer lightest overall weight complete finish fiberglass engine cowl molded cellu lose acetate canopy available Aero composites Corp 411 Townsend Place Dayton 0hio4543 1 cowl frameworkmolded canopy painted match Mono kote colors used paint scheme OK WKE represents Czechoslovakian Team colors other airplane shown done British Aerobatic Team colors Since countries fly Zlin large variety color scheme options choose Installation Radio installation fairly straight forward use 60 stow flight pack battery above gas tank 91 locate battery above servo tray further aft necessary achieve proper CG receiver foam wrapped sits fuselage bay just front servo tray Aileron retract linkage shown drawings plans show independent control horns elevator half require pushrod exits rear fuselage both sides M alternative elevator halves may joined central horn single pushrod concealed fuselage rudder pushrod may attached internally tail wheel steering arm before exits fuselage side its way back rudder Flying 526 AS Zlin designed high-performance machine capable perform ing AMA FAI Vegas Tournament maneuvers Flying aircraft pure pleasure difficult considering its very high performance potential Takeoffs piece 104 Model Aviation Please send mecopies new 5th edition Radio Control Buyers Guide Enclosed $825 copy ordered $725 retail plus $100 postage & handling City State ZIP Return RC Buyers Guide Clifton House Clifton VA 22024 Purchasing R/C Aircraft easy YOUNIQUE AT Hobby Capitol keep large ready supply Custom-But RC Aircraft Kits Engines RC Units times And. thanks years experience dealing people sections US. prepare special one-of-a-kind RC Aircraft special one-ofa-kind RC flyer demands unique look express tastes Chances youll find custom paint finish exquisite detailed cockpit interiors glassed engine compartments real scale wheels custom grilled nose section will knock socks offi l probably never see another like cause Hobby Capitol expert stressed preparation goes far beyond standard checkout RC shoppers turning up increasing numbers convenient showroom because word out. outstanding buys service finest selection unique RC Aircraft anywhere its HOBBY CAPITOL Old Ignition Trade-in Buy sell old time ignition engines Box up what yau have send us honest appraisal could worth new proportional set have engines can also start collection welcome built-up airplanes used proportionals old time ignition engines Come trade us Top dollar Custom-1311t-RjC Built Order Plans Ft stock choose Its s40000 PIp TrI-Pocm Quorter-ale 89 wingspan 42 Sq Ft detajied dans $1699 PP nd $100 self addressed stomped envelope detoiled list Built-Up R/C Models 50% Sole Hobby Capitol 46 N Oak St Ventura CA 93001 Phone 805 643-7616 642-8465 cake Landings require little care prevent tip stall still very slow generous wing area would recommend drag nose high however Super docile land ings could achieved some sacrifice snapping capability blunting wing leading edge toward tip can play its performance potential starting forward CG slowly moving back improve snapping roll characteristics used fairly aft CG location get very best performance snaps rolls also worked bit wing incidence engine thrust line zero-zero set up works well little bit engine right thrust ease torque effects Speaking torque Webra 91 pulls aircraft along ease using 14-6 7 prop used non-stock 60-size Perry pump carburetor Webra since will turn 10500 11000 carb prop choice becomes critical Vertical performance first thing suffer engine prop mismatched large high-drag airplanes like recommend very stiff torque pushrods throughout since control loads high will want use husky servos extremely tight centering resolution have found big ships rapid pot wear occurs servos tight due control loads increased control surface dither Fortunately will find large slow aircraft tolerant control dead-band high-speed pattern ships Im sure will especially appreciate very tight looping cornering capability Zlin large wing low wing loading will give spectacularly tight square loops Rolling maneuvers will require little work standard pattern ship due reduced airspeed smaller power loading somewhat shortcoupled design Youll find other large slower aircraft require increased proficiency rudder part pilot really feel will enjoy flying Zlin because combines realistic good looks fine aerobatic performance What could modeler ask Trans America Riches continued page 24 necessary know would no flying Wednesday made two Wed nesdays row After awards presentation motel Meridian team first 3 minutes ahead number 2 Montgomery team officials off Jackson MS start next leg high winds bothering Riches pick up worse Saggin Wagon AMA motorhome Bob Roach drove bad left rear spring causing perpetual lean hence Saggin Wagon weather clearing Jackson reports pretty good next morning didnt help Jimmy Grier tonight Three team members airplanes still Chicago Jerry Nelson have Jackson already planes Hurricane Frederick delayed slightly would early next morning Doc Edwards Jimmy takeoff area early rest Team 3 BTHOOM Team wasnt Jimmys Cessna somewhere between Chicago Jackson didnt look good though up until around 2 am fixing Docs truck pilot vehicle borrowed lead vehicle didnt look BTHOOM team going make alone ask what BTHOOM team Jimmy Grier asked what name team replied after slight delay Beats Hell Out other four teams off away frontage road takeoff area still no planes Jimmys team no rest team did arrive frantic rush get ready air being taped TV crew arrived late teams ran close part leg passing other pit stops teams good times team work payed off though three planes crashed Everyone ready takeoff West Monroe LA mayor hand see planes off police help teams get through traffic lights onto freeway fire department added nice touch hot coffee everyone Bob Roach much happier now wife Sue joined him Jackson would take care selling chances Pitts Special souvenirs rest trip As usual days flights uneventful Murphys Law again teams close coming Sharks field Bossier City LA Shreveport club big recep tion barbecue ready police escort freeway field big help did cause some confusion Doc Edwards trying get lead vehicle ahead guide Team 3s pilot vehicle landing area police car raced past going other direction siren wailing lights flashing police car made abrupt U-turn Doc jammed brakes let pass As Doc watching pull alongside thought bought sure policeman leaned Out window big sweeping motion arm yelled Cmon lets make Doc told Doris little later lucky have coronary Team 5 Sharks Club team fittingly received champagne first team top honors leg Shreveport John Embry AMA VP District VIII Ba Kinch Lake Charles club joined race CDs volunteered fill last minute vacancies leg Bo continue Abilene TX help out flight Shreveport Dallas long makes pit stops possible trouble Out five started Kellys Truck Stop morning four made no normal number problems broken props bent landing gears deadstick landings lost hatches crash two addition morning briefings Dont wear race hats back pilot vehicles tying Because no going lose valuable time retrieving race route well marked lost blue-and-white hats flight Mesquite Model Field Ft Worth uneventful five planes made short flight about 50 miles good time high point takeoff Mesquite reading proclamation mayor Dallas AMA past president Johnny Clemens along mayor pro tem Mesquite gave planes good send off landing Tarrant County Junior College landing area Fort Worth Jim Simpsons Southwest Modelers RC Club team least number problems took first place hardware three half minutes ahead John Kikers NASA Flyers Houston takeoff Ft Worth Wednesday 106 Model Aviation
Edition: Model Aviation - 1980/02
Page Numbers: 10, 11, 12, 13, 14, 15, 16, 17, 102, 104, 106
NO OCR TEXT NO OCR TEXT I SCENT I- I CSKCBc-CO lICK I I, ROCK-~c Alliii II JfpgTiC rI ICSONOOK PSFT IllsP5060110 0* FROB 106F0OOSKICK 0300 3~CO NKKKCOAIE01ItQS3i l&LCMCOCOBCCSOKSAL FIN SINK OKOCCISO ICSO0 PLOICSPLO0-00' r OCIKOO3KL573 OC OKKOKII OOEKLOCOSIK I..KOONlFS2PLO ICC SOUK 04013 pOKOOmI 40530 TMOSOKKL Naturally enough Don felt should seek aircraft similar layout Phoenix Zlin 526 726 series offered variety designs somewhat like Phoenix low-wing long-tail moment vehicles slightly swept wings Just finding full-scale aerobatic bird lines along success ful model design going enough however arrive winning design totally new event purpose avoid model flying characteristics stress scale realism decided go large light Large add realism presentation ease attitude recognition pilot judge Also large add drag slower flight again realism also help keep airplane 1200 box maneuvers performed Light weight considered essential vertical performance minimizing wing loading would allow sharp square comers flaps Another advantage light weight aerobatic aircraft Seen rear color-scheme lines emphasize feeling forward motion tenna strung stabilizer tip 12 Model Aviation Well-executed nose cowling really mean much Details ot tibergiass cowi snow up we. shotnote handling 4.m asn4 tho *sonInn Mir nnnnmnfl Just another picture provide another eyeview sne color scneme 11101 IS unarime Brown no Ice Mnlc fInuthrnusnl mumfflsr FULL SIZE PLANS AVAILABLE SEE PAGE 128 AICASONS LOAPJC/KAILWAASE7$5/SKOAKL PSOAOPCO oocsocxPSCMSATSSIALCCT n5/NACENT SAC III I S/SFLAT TOP SSAOSOLrCI S/A ISOCK 50 P55COMAI/ASPASTAPESS ACAS STACK SPACES/L/5S/SEALKM /LOS OP S/TA SCT P575555 ALLSACA SOOT ASK CT1 COT SACS/SBEAPtATPS SANK STACK1-U ACTAC PAN SCAM MASKS SAS TON ONE COLT AK/Sot5Ao5~OS MONET - X SET *I-2PM51 SAra S/lA SONTAIIfiAAA1AM NE iS/IA CSIAL-0515451C jF 05/IS ACAECttP tIZVCN II /S/ AGEMACAT POAS COATCCCNACCS~ SACASOC OCITSJ PANEL/Cl PS SIS/INOS ICS1/AMALSOp55 PCS 5/5505/SPM/CPBS MELLC PA ACCOLH OAMCS~ SOMI I/A SNUASO I I/S PCCI/A CCC Ii~2F /6II-I/-6-/vII//OSSOASK ACOOCENLACACICS OPI X KOCCOAOKkC /0 POSECCOK NOES _____________________________________________ III ThI jO fli AI EL PM II/A A/ALE MOCCA MO/NTCUT FRAN/NPUSECSOE ASKS IK SESOLOSCEKTSICK/AC PLO 00/MAPS/NO SOEKC IT IPASACNRO lASS PEAPSACALPSKLTION 00 I/S MACSMPTACONPSO7T- NOKOSjS/AC SOAPS rIIU/SSSOAAK~~ I/AS/C/ASS0I U[I II pIFS / H0500050/SC C/SPATS NOCCIOMA010 1/SOPLO1/ [ CUCTACAC 5/ASCOEC I I/N So/SECSET KACM/SF jMgj0I/SPLO5~ ISN-IS I/SNCUOSE] NLAOS CANE II / MOSPANI I/SN/C/COCKI/SM/AIOiMSj-ACOAS ~CUASE S SUNKCUT PACM I/S N/SECI II/MM/TO/CNL ASK CANOPY SE/CP1no 0550 CASASSICTS N/ASS/SN I CKASNKSO PLACE ----S often overlooked reduction inertia property also opposes cessation characteristics exactly what dont want angular moments inertia rotation airplane already rotating event precision point rolls snap An angular moment inertia mass property other words airplane high angular rolls required 3T maneuvers aircraft oppotes its rotation about moment inertia roll hard start rolling keeping structural weight absolute either its yaw pitch roll axis same difficult stop rolling once starts minimum could reduce moments February 1980 13 I I unsandL A/SSBCONAC /SSASSAC US SEA resmivemy simpie details complete tail detaches two separate pieces SACS ISS/odS 555 SES/Sy uc aeparaoeo orom inc stanhlizer reattached fuselage dowel two screws Facilitates transport i ysHIToo rU L 5QUARE RETRACT BEAM OUT TO BLOCS PLODD 5H0W 0 Up d\m ALTERNATE WING CONSTRUCTiON IS 3/3Z BALSA RIBS WITH SAME SPARS LEADING TRAILING EDGES 3/32 SHEET FRONT CECKING AEROCOMPOSITE CANOPY RUDDER & ELEVAlOR NYRODS TO SERVOS 3/8 BALSAN MIDDLE FAIRLEAD 6CKTO TAlL FOUR NO 2 SCREWS SECURE COWLING TO FUSELAGE I/8PIWJOD GUSSETS lOP AND BOTTOM WEBRA 91 ENGINE 2 3/4DIA- SPINNER AEROCOMPOSITES COWLING SCALE TO FIT 1/2 MAPLE ENGINE MOUNT . RECHESlOF-2 2 1/32 PLYWOOD FUSELAGE DOUBLER FROM F-I BELLY N IS CEMENTED 10 BOlTOM OF WING FIRST -24 SCREWS TO SECURE WING THRU 5/8 DOWELS 3A6 DOWELS IMBED INlO FOAM TO ANCHOR L G I/4 PLYVOD PLATFORM FOAM CORE IN RUDDER AND FIN II/4X3/4TE /16 PLYWXfl BOX3/16 X 1/4 FIN POSTI ENCASES STABILIZER1/16 SHEETING 5A6 DOWELS LOCKBALSA RUDDER FOST 1N TO FUSELAGE 3 /8 SQTOP ANDALL SCREWS HERE 3011DM FAIRLEAD 5/ 1600 WELFOR HORN 4-40 SCREWS MOUNT FIN BASETO BOX 4 BALSA DORSAL FOAM CORES / // WS I\~IssFiNPOST /GOLDBERG1/4 X 1/2 BALSA STABLIZER LE 5/16 DOWEL- 3/32 HOLE FOR HORN 1 1/2 DIA TAILWHEEL 1/4 SQ DIAGONALS 1/8 BALSA SIDE RINELS F-I 10 TAL3/16u X 3/8 BOTTOM KEEL V4SQ BOTTOM LONGERONS 10-24 REAR WING HOLD SCREVJS ThRJ 5/8DOWELS 1/8 MUSIC WIRE TOI/I& SHEET BALSATOP AND BOTfOM AILERON SERVOSV16 X 1/4 CAP STRIPS OVER FOAM 1 1/2 TRAILING EDGE STOCK DOUBLED FOR AILERONS 2 RETRACTABLE BELLCRANK ON 1/8 PLYWOOD PLATFOFA 1/4 X BALSA LEADING EDGEHOLLOWED BALSA BLOCK 3DIA MAIN WHEELS SOUTHERN RETRACT SYSTEM FROM SERVO POWER ONLY February 1980 15 1/4 HARD BALSA SPAR FRONT AND REAR TOP AND BCIlTCM inertia insure crisp totally controllable rotations aircraft about its axes finally settled Zlin 526 AS basis project 526 AS singleplace aerobatic low wing faired-in canopy in-line engine wing fairly high aspect ratio implies good roll damping leading edge swept straight trailing edge resulting wing sweep about 4 degrees Thrust line wing horizontal tail separated vertically very much usually means control coupling less likely Vertical tail size large enough scale directly horizontal tail size increased span chord maximum allowable 15% scale engine cowl allowed very neat inverted instal lation Webra 91 chosen power Finally retractable landing gear real aircraft allowed us include feature model well course airplane can improved made some subtle changes within rules hopes achieving model would fly con siderably better true scale replica Sym metrical airfoils substituted wing shortened its aspect ratio reduced widening tip chord wing also moved forward inch lengthen tail moment improve balance thrust line horizontal tail lowered wing raised slightly order bring surfaces nearly line thrust vector width fuselage reduced 15% canopy moved forward inch help knifeedge flight Strip ailerons substituted full-size aircrafts conventional ones horizontal tail increased chord span improve tail volume coefficient other aspects aircraft true scale very close including fuselage cross section aircraft sized 950 sq well over minimum quite bit smaller some other airplanes turned up Vegas weight goal set 9 pounds achieved would result excellent vertical per formance Webra 91 first version built-up wing vertical fin second 526 AS built Steve Rojecki foam wing cut out resemble rib structure added balsa spars sheeting wound up open framework foam wing closely resembling built-up version Both airplanes MonoKote Solar Film covered Epoxypainted fiberglass cowls custom molded canopies added complete vehicles both weighed 8 pounds ready fly minus fuel Initial flights both aircraft very encour aging obvious efforts achieve low angular inertia minimum weight paid off Square corners sharp clean precise starting stopping rolling maneuvers successfullly accomplished airplane fast highly desirable quality flying nearly constant speed high drag large airframe slowed down dives engine pulled vertically little sag due its low 16 Model Aviation Aft fuselage detail showing dowel holes screws attaching tail section Rudder pushrod attaches internally tail-wheel arm steering Larger size models permit flexibility structural design Underside detachable tail Three large holes pruvue eiuu tu ue screws attach fin stabilizer Two holes rear screws attach entire unit fuselage Using Southern RC retractswith Fox wheelsgear swings aft rather sideways duplicate retractable function real craft Servo installation wing aileron servo rear retract servo forward Bands hold screws place fuselage equipment bay dwarfs servo tray receiver forward batteries located under servo tray Note pushrods aluminum tubing weight reliability inside outside snapping maneuvers improved moving center gravity back its current location shown plans snaps also enhanced wing itself airfoil gets thinner toward tip leading edge sharpens outboard Both airplanes flown 1978 Tourn ament Champions new Prototype Pattern original built author flown 14th place finish Don Lowe other built Steve Rojecki flown Steve capacity pattern demonstration flier Steve competitor flew full pattern before judges during training beginning round official flying idea establish base flight judges rather have react differently first few flights round Steve probably got assignment proven flying abilities also because rare individual invited competitor did have qualified airplane event As case new events rules Vegas Prototype Pattern provisional subject change improvement based success first event rules changed 1980 Zlin 526 AS pre sented no longer eligible Vegas too small now minimum size mono plane has increased 1100 sq since Vegas invitational event limited about 25 select competitors unlikely would have built purpose Zlin 526 AS remains attractive model stand-off scale events 60 91 offers exciting bonus full aerobatic capability Construction Its always best tackle toughest building chore first. Normally means wing case fuselage rates first attention fuselage complicated its simulation real airplanes fabric covered longeron structure its provisions removable tail section tail separates fuselage make transporting airplane easier vertical fin may attached fuselage horizontal installed some reason wanted transport fuselage intact elevator halves sticking out happen have ample vehicle like van station wagon dont plan ship airplane Nevada year recom mend build permanent fixed tail surfaces reduces complexity saves weight eliminating lot plywood get started fuselage bulkheads Fl F2 two motor mounts 1/4 sq cross brace 1/16 floor between bulkheads Fl F2 assembled unit using slow setting epoxy Bulkheads F3 through F7 built up sa overlapping corner joints Add doublers join fuselage halves bulkheads F3 through F7 fuselage upside down flat building board aligned top view plans Add bulkheads F8 F9 after removing fuse lage board Before adding forward bulkhead unit epoxy aware fuselage sides will form hour glass top view unit added looks strange requires some good clamping possibly wet ting sides accomplish required order fair longeron-type aft fuselage struc ture smooth-sided nose structure Editors Note consider Zlin super aircraft skilled pilot wants something bit d/ferent special both personaiship heflies andfor highly realistic maneuvers can perform ft took little doing bring together Don Lowe Phoenix Marks given dashing off magazine projects developed design worked out Ken Don pooled wits ship built Ken pilot Lowe last saw Ken fly 1966 meet da4 Vince afellowRC oldtimer sur prised high level workmanship excellent writing long articleand would kits have such fine instructions Weve eliminate another article issue avoid diluting Kens copy top off Don Lowe did climactic commentay based upon piloting experiences basic fuselage box completed upper lower partial bulkheads added Next install 1/4 sq diagonal braces bottom fuselage add sq longerons point sq longerons top bottom edges fuselage sides glued place Fuselage top sheeting installed six pieces Two pieces 1/16 form turtledeck Four pieces 3/32 form top sheeting forward canopy Cross grain ting installed cockpit floor bottom nose after gas tank has installed Note Fuelproof entire gas tank compartment coat epoxy Add four pieces /4 balsa sheet two tail two above wing leading edge help fair longerons tailpost nose Cut wing saddles sheet glue fuselage Add ongerons fuselage sides epoxy plywood gussets strengthen motor mounts Before gluing om sheeting between F8 F9 tail wheel mount bolted F8 Also incorporating detachable tail ood plate should installed aft F9 back fuselage should faced 1/16 plywood flat surface removable tail sits covered 1/16 ply center has cut out aft section fuselage sanded such flat panels Monokote result covered flat upper enter ext center ower ower sq ower longeron finally / sq longeron middle 3/16 om central longeron t back fuselage beveled tapered fair sq longerons back tailpost t above wing leading edge faired sq wing saddle its rear edge feathered fuselage side its forward edge saddle sanded k its aft end about 3/16 thick its forward Continued page 102 February 1980 17 jetacnanie tail aetall shown align ment dowels parting line between vertical fin horizontal tail Ken Bonnema displays bottom ship can admire its color schemebit wild what Looking Better Silicone Tubing LUE LINE Its Thicker Stronger Highly Heat Resis tant Flexible other fuel lines Whats moreBLUE LINE eith er equal lower price others So dont fooled Remember ask original BLUE LINE tubing Send SASE today free catalog fine products El O7kENZ2 44W Prospect St New Haven Conn 06515 PRODUCTS safety radio control flying club needs some system aasure two transmitters same frequency notturnedon same time An orderly system does much avoid looks panic shouting flight lineor worse Generation Products producing com plete set engraved high quality frequency pins club use pins check hoard flight line moments panic can avoided frequency pins made high quality engravers plastic sandwich-like con struction numbers engraved cutting through top layer plastic thereby exposing second layer No paint used no fading wearing away numbers pin contains frequency number also color-codedtO match theflags transmitter Construction pins first rate set should stand up club use considerable time period product review product review product review ZIin/ Bonnema continued page 1 7 edge meets t al fin sanded Monokoted glued after rest fuselage has Monokoted Epoxy wing hold-downs drill yet Wing plans show foam wing mainly cause much simpler build no weight penalty occurred between Rojeckis foam wing built up version original wing half should cut lb/cu ft density foam block least 5 inches thick blocks faced foam wire cutter insure square Align root tip templates block absolutely no twist include dihedral raising centerline tip rib 070 inches above centerline root rib Locate root rib exact same place both blocks wing halves may joined blocks flat surface later Cut out core including spar notches using hot-wire bow Number rib templates before hand equal chord percentage segments hot wire may drawn past identical chord stations times both root tip templates After cores have cut blocks cut Out two templates cardboard thin plywood cutouts cores Place cores back blocks sandwich together place template side cut open areas push piece 1/16 music wire through spaces cut out Slip center-drilled piece l rod over end wire attach current regulated hot leads outside dowels Holding new hot wire wooden dowels run around inside templates thus cutting out area removed Repeat procedure cutout area Tapered spars cut very hard a glued cores Titebond epoxy Keep cores blocks weighted flat surface spars dry Next cut out landing gear unit clearance wheel wells servo boxes linkage channels copper wire forms placed heavy duty soldering gun Epoxy landing gear mounting plates 4-40 blind nuts already installed plates have four 3/16 dowels pro truding down foam extra gluing area added strength Glue bellcrank mounts install bellcranks landing gear linkage Sheet center section leading edge trailing edge 1/16 balsa sheet Slow setting epoxy sparingly applied balsa recommended Spreading epoxy foam does improve bond does add considerable weight Again set cores back blocks weight flat surface sheeting drying After sheeting dry trim excess sand flush foam Add tip blocks 3/16 trailing edge ing edge cap strips Remove sheeting has covered wheel well landing gear cavity Join wing halves flat surface epoxing center section both halves resting foam blocks Weight allow adequate time epoxy set up Ailerons laminated two pieces 1 trailing edge stock glued together longest surface longest surface leading edge bevel get quite enough must sanded allow sufficient aileron throw dowel drilled embedded aileron near root aileron horns essential An experiment 3/32 wire resulted aileron flutter fixed portion wing trailing edge lying between two ailerons laminated balsa sheet Clearance notched front piece Install aileron horn wires brass nylon guides before gluing central trailing edge section Drill holes clear through wing epoxy four ls have drilled through 3/16 wing bolts Sand flush upper lower surfaces wing reinforce wing center section wrap first layer 7-oz fiberglass cloth layer 2oz cloth Drill through hardened fiberglass open wing bolt holes Set wing fuselage align very carefully Run long 3/16 drill through bolt holes already wing drill through plywood wing mounting plates fuselage Remove wing enlarge holes fuselage plates install 10-24 blind nuts Bolt wing fuselage build up belly pan aligns perfectly fuselage Use paper tubes bolt guides through belly pan Cut away fiberglass balsa sheet covering servo box install rails aileron retract servos Rib spacing built up wing shown plans Using tip root templates provided sandwich 15 pieces 3/32 baisa between templates sand stack down form ribs wing half Spar location size un changed foam wing Leading edge trailing edge sheeting cap strips also un changed 1/16 balsa vertical grain spar webbing glued between ribs both front rear spars landing gear mount system shown can used ribs either side must reinforced plywood Wheel wells must built up 1/16 balsa sheet Ailerons tips center section including fiberglass reinforcement unchanged Tail Surfaces Foam cores vertical fin rudder stabilizer elevator cut using templates provided 1 / 16 sheeting epoxied wing surfaces left dry weighted foam blocks flat table Leading trailing edges tip blocks glued after sheeting has trimmed sanded Note 3/16 vertiial fin trailing edge exception glued foam core before sheeting sheeting overlaps Elevators rudder have l installed drilled 3/32 wire control horn joined stabilizer halves wrapped fiberglass cloth shown plans fol lowing steps must adhered 102 Model Aviation Available im 5 sizes fit appli cation about 59 per ft Shown above SUPER BLUE set upwith extra-large tubing 4 reusable ties & end-of-line nozzles $369 per pkg nrnrIiut review nrnduat review nrnduat review Frequency Pins @ $2500/ set Generation Pro ducts Co. Inc. 5512 Southwood Little Rock AR 72205 incorporating removable tail Spot glue mating piece 1/16 ply top plywood tail mounting surface fuselage upper piece should about shorter fuselage piece front edge piece glue another piece 1/16 ply matches upper middle quarter F8 including two 3/16 dowel holes Insert two 3/16 dowels through holes glue plywood floor glue dowels F8 back edge plywood floor glue F9A balsa Glue a lower saddles stabilizer Align stabilizer carefully glue saddles Glue a upper stabilizer saddles cap top saddles 1/16 plywood should now have box structure completely surrounding stabilizer plywood bottom top front balsa back break fuselage yet Spot glue another piece 1/16 plywood top box structure front edge piece glue piece plywood matches uppermost portion F8 including 3/16 dowel hole Also glue two blocks ood top plywood floor shown plans Drill 4-40 clearance hole through center front block clear through stabilizer box Drill two 4-40 clearance holes through rear block again clear through stabilizer box Enlarge three holes ply blocks install 4-40 blind nuts Insert piece 3/16 dowel through its hole glue plywood floor glue dowel F8 Now spot glue piece ood original 1/16 plywood tail mounting surface half-inch space left open behind stabilizer box k should fill entire space should 1/16 short width both sides Drill two 4-40 clearance holes through block through corresponding block fuselage underneath Enlarge holes upper block install two 4-40 blind nuts Now glue piece 1/16 plywood matches back face stabilizer box ood piece just installed 1/16 plywood floor spot glued top stabilizer box glue piece stabilizer box Now take sheeted vertical fin its extended hinge line post cut clearance bottom two plywood blind nut blocks 3/16 dowel mounted upper plywood floor Trim rudder post just contacts plywood blind nut block behind stabilizer box trim vertical fin sheeting fits over outside edges plywood block lines up fueslage sides Glue vertical fin upper plywood floor plywood pieces behind stabilizer box careful glue vertical fin assembly stabilizer box Glue sandtwo balsa blocks fair vertical fin F8 Finally add a dorsal fin assembly dry separate vertical fin assembly fuselage stabilizer box using razor blade break spot glue joints separate stabilizer box fuselage same way Enlarge three holes stabilizer box its lower side holes should opened up lower plywood floor stablizer itself enlarge holes upper plywood cap Glue paper straws act screw guides Now can sit back relax curse yourself building fixed tall fix tail surfaces simply eliminate plywood pieces enlarge balsa pieces accordingly glue everything together permanently Finishing Monokote Solar Film strongly recommended materials closely simulate fabric covering full-scale airplane offer lightest overall weight complete finish fiberglass engine cowl molded cellu lose acetate canopy available Aero composites Corp 411 Townsend Place Dayton 0hio4543 1 cowl frameworkmolded canopy painted match Mono kote colors used paint scheme OK WKE represents Czechoslovakian Team colors other airplane shown done British Aerobatic Team colors Since countries fly Zlin large variety color scheme options choose Installation Radio installation fairly straight forward use 60 stow flight pack battery above gas tank 91 locate battery above servo tray further aft necessary achieve proper CG receiver foam wrapped sits fuselage bay just front servo tray Aileron retract linkage shown drawings plans show independent control horns elevator half require pushrod exits rear fuselage both sides M alternative elevator halves may joined central horn single pushrod concealed fuselage rudder pushrod may attached internally tail wheel steering arm before exits fuselage side its way back rudder Flying 526 AS Zlin designed high-performance machine capable perform ing AMA FAI Vegas Tournament maneuvers Flying aircraft pure pleasure difficult considering its very high performance potential Takeoffs piece 104 Model Aviation Please send mecopies new 5th edition Radio Control Buyers Guide Enclosed $825 copy ordered $725 retail plus $100 postage & handling City State ZIP Return RC Buyers Guide Clifton House Clifton VA 22024 Purchasing R/C Aircraft easy YOUNIQUE AT Hobby Capitol keep large ready supply Custom-But RC Aircraft Kits Engines RC Units times And. thanks years experience dealing people sections US. prepare special one-of-a-kind RC Aircraft special one-ofa-kind RC flyer demands unique look express tastes Chances youll find custom paint finish exquisite detailed cockpit interiors glassed engine compartments real scale wheels custom grilled nose section will knock socks offi l probably never see another like cause Hobby Capitol expert stressed preparation goes far beyond standard checkout RC shoppers turning up increasing numbers convenient showroom because word out. outstanding buys service finest selection unique RC Aircraft anywhere its HOBBY CAPITOL Old Ignition Trade-in Buy sell old time ignition engines Box up what yau have send us honest appraisal could worth new proportional set have engines can also start collection welcome built-up airplanes used proportionals old time ignition engines Come trade us Top dollar Custom-1311t-RjC Built Order Plans Ft stock choose Its s40000 PIp TrI-Pocm Quorter-ale 89 wingspan 42 Sq Ft detajied dans $1699 PP nd $100 self addressed stomped envelope detoiled list Built-Up R/C Models 50% Sole Hobby Capitol 46 N Oak St Ventura CA 93001 Phone 805 643-7616 642-8465 cake Landings require little care prevent tip stall still very slow generous wing area would recommend drag nose high however Super docile land ings could achieved some sacrifice snapping capability blunting wing leading edge toward tip can play its performance potential starting forward CG slowly moving back improve snapping roll characteristics used fairly aft CG location get very best performance snaps rolls also worked bit wing incidence engine thrust line zero-zero set up works well little bit engine right thrust ease torque effects Speaking torque Webra 91 pulls aircraft along ease using 14-6 7 prop used non-stock 60-size Perry pump carburetor Webra since will turn 10500 11000 carb prop choice becomes critical Vertical performance first thing suffer engine prop mismatched large high-drag airplanes like recommend very stiff torque pushrods throughout since control loads high will want use husky servos extremely tight centering resolution have found big ships rapid pot wear occurs servos tight due control loads increased control surface dither Fortunately will find large slow aircraft tolerant control dead-band high-speed pattern ships Im sure will especially appreciate very tight looping cornering capability Zlin large wing low wing loading will give spectacularly tight square loops Rolling maneuvers will require little work standard pattern ship due reduced airspeed smaller power loading somewhat shortcoupled design Youll find other large slower aircraft require increased proficiency rudder part pilot really feel will enjoy flying Zlin because combines realistic good looks fine aerobatic performance What could modeler ask Trans America Riches continued page 24 necessary know would no flying Wednesday made two Wed nesdays row After awards presentation motel Meridian team first 3 minutes ahead number 2 Montgomery team officials off Jackson MS start next leg high winds bothering Riches pick up worse Saggin Wagon AMA motorhome Bob Roach drove bad left rear spring causing perpetual lean hence Saggin Wagon weather clearing Jackson reports pretty good next morning didnt help Jimmy Grier tonight Three team members airplanes still Chicago Jerry Nelson have Jackson already planes Hurricane Frederick delayed slightly would early next morning Doc Edwards Jimmy takeoff area early rest Team 3 BTHOOM Team wasnt Jimmys Cessna somewhere between Chicago Jackson didnt look good though up until around 2 am fixing Docs truck pilot vehicle borrowed lead vehicle didnt look BTHOOM team going make alone ask what BTHOOM team Jimmy Grier asked what name team replied after slight delay Beats Hell Out other four teams off away frontage road takeoff area still no planes Jimmys team no rest team did arrive frantic rush get ready air being taped TV crew arrived late teams ran close part leg passing other pit stops teams good times team work payed off though three planes crashed Everyone ready takeoff West Monroe LA mayor hand see planes off police help teams get through traffic lights onto freeway fire department added nice touch hot coffee everyone Bob Roach much happier now wife Sue joined him Jackson would take care selling chances Pitts Special souvenirs rest trip As usual days flights uneventful Murphys Law again teams close coming Sharks field Bossier City LA Shreveport club big recep tion barbecue ready police escort freeway field big help did cause some confusion Doc Edwards trying get lead vehicle ahead guide Team 3s pilot vehicle landing area police car raced past going other direction siren wailing lights flashing police car made abrupt U-turn Doc jammed brakes let pass As Doc watching pull alongside thought bought sure policeman leaned Out window big sweeping motion arm yelled Cmon lets make Doc told Doris little later lucky have coronary Team 5 Sharks Club team fittingly received champagne first team top honors leg Shreveport John Embry AMA VP District VIII Ba Kinch Lake Charles club joined race CDs volunteered fill last minute vacancies leg Bo continue Abilene TX help out flight Shreveport Dallas long makes pit stops possible trouble Out five started Kellys Truck Stop morning four made no normal number problems broken props bent landing gears deadstick landings lost hatches crash two addition morning briefings Dont wear race hats back pilot vehicles tying Because no going lose valuable time retrieving race route well marked lost blue-and-white hats flight Mesquite Model Field Ft Worth uneventful five planes made short flight about 50 miles good time high point takeoff Mesquite reading proclamation mayor Dallas AMA past president Johnny Clemens along mayor pro tem Mesquite gave planes good send off landing Tarrant County Junior College landing area Fort Worth Jim Simpsons Southwest Modelers RC Club team least number problems took first place hardware three half minutes ahead John Kikers NASA Flyers Houston takeoff Ft Worth Wednesday 106 Model Aviation
Edition: Model Aviation - 1980/02
Page Numbers: 10, 11, 12, 13, 14, 15, 16, 17, 102, 104, 106
NO OCR TEXT NO OCR TEXT I SCENT I- I CSKCBc-CO lICK I I, ROCK-~c Alliii II JfpgTiC rI ICSONOOK PSFT IllsP5060110 0* FROB 106F0OOSKICK 0300 3~CO NKKKCOAIE01ItQS3i l&LCMCOCOBCCSOKSAL FIN SINK OKOCCISO ICSO0 PLOICSPLO0-00' r OCIKOO3KL573 OC OKKOKII OOEKLOCOSIK I..KOONlFS2PLO ICC SOUK 04013 pOKOOmI 40530 TMOSOKKL Naturally enough Don felt should seek aircraft similar layout Phoenix Zlin 526 726 series offered variety designs somewhat like Phoenix low-wing long-tail moment vehicles slightly swept wings Just finding full-scale aerobatic bird lines along success ful model design going enough however arrive winning design totally new event purpose avoid model flying characteristics stress scale realism decided go large light Large add realism presentation ease attitude recognition pilot judge Also large add drag slower flight again realism also help keep airplane 1200 box maneuvers performed Light weight considered essential vertical performance minimizing wing loading would allow sharp square comers flaps Another advantage light weight aerobatic aircraft Seen rear color-scheme lines emphasize feeling forward motion tenna strung stabilizer tip 12 Model Aviation Well-executed nose cowling really mean much Details ot tibergiass cowi snow up we. shotnote handling 4.m asn4 tho *sonInn Mir nnnnmnfl Just another picture provide another eyeview sne color scneme 11101 IS unarime Brown no Ice Mnlc fInuthrnusnl mumfflsr FULL SIZE PLANS AVAILABLE SEE PAGE 128 AICASONS LOAPJC/KAILWAASE7$5/SKOAKL PSOAOPCO oocsocxPSCMSATSSIALCCT n5/NACENT SAC III I S/SFLAT TOP SSAOSOLrCI S/A ISOCK 50 P55COMAI/ASPASTAPESS ACAS STACK SPACES/L/5S/SEALKM /LOS OP S/TA SCT P575555 ALLSACA SOOT ASK CT1 COT SACS/SBEAPtATPS SANK STACK1-U ACTAC PAN SCAM MASKS SAS TON ONE COLT AK/Sot5Ao5~OS MONET - X SET *I-2PM51 SAra S/lA SONTAIIfiAAA1AM NE iS/IA CSIAL-0515451C jF 05/IS ACAECttP tIZVCN II /S/ AGEMACAT POAS COATCCCNACCS~ SACASOC OCITSJ PANEL/Cl PS SIS/INOS ICS1/AMALSOp55 PCS 5/5505/SPM/CPBS MELLC PA ACCOLH OAMCS~ SOMI I/A SNUASO I I/S PCCI/A CCC Ii~2F /6II-I/-6-/vII//OSSOASK ACOOCENLACACICS OPI X KOCCOAOKkC /0 POSECCOK NOES _____________________________________________ III ThI jO fli AI EL PM II/A A/ALE MOCCA MO/NTCUT FRAN/NPUSECSOE ASKS IK SESOLOSCEKTSICK/AC PLO 00/MAPS/NO SOEKC IT IPASACNRO lASS PEAPSACALPSKLTION 00 I/S MACSMPTACONPSO7T- NOKOSjS/AC SOAPS rIIU/SSSOAAK~~ I/AS/C/ASS0I U[I II pIFS / H0500050/SC C/SPATS NOCCIOMA010 1/SOPLO1/ [ CUCTACAC 5/ASCOEC I I/N So/SECSET KACM/SF jMgj0I/SPLO5~ ISN-IS I/SNCUOSE] NLAOS CANE II / MOSPANI I/SN/C/COCKI/SM/AIOiMSj-ACOAS ~CUASE S SUNKCUT PACM I/S N/SECI II/MM/TO/CNL ASK CANOPY SE/CP1no 0550 CASASSICTS N/ASS/SN I CKASNKSO PLACE ----S often overlooked reduction inertia property also opposes cessation characteristics exactly what dont want angular moments inertia rotation airplane already rotating event precision point rolls snap An angular moment inertia mass property other words airplane high angular rolls required 3T maneuvers aircraft oppotes its rotation about moment inertia roll hard start rolling keeping structural weight absolute either its yaw pitch roll axis same difficult stop rolling once starts minimum could reduce moments February 1980 13 I I unsandL A/SSBCONAC /SSASSAC US SEA resmivemy simpie details complete tail detaches two separate pieces SACS ISS/odS 555 SES/Sy uc aeparaoeo orom inc stanhlizer reattached fuselage dowel two screws Facilitates transport i ysHIToo rU L 5QUARE RETRACT BEAM OUT TO BLOCS PLODD 5H0W 0 Up d\m ALTERNATE WING CONSTRUCTiON IS 3/3Z BALSA RIBS WITH SAME SPARS LEADING TRAILING EDGES 3/32 SHEET FRONT CECKING AEROCOMPOSITE CANOPY RUDDER & ELEVAlOR NYRODS TO SERVOS 3/8 BALSAN MIDDLE FAIRLEAD 6CKTO TAlL FOUR NO 2 SCREWS SECURE COWLING TO FUSELAGE I/8PIWJOD GUSSETS lOP AND BOTTOM WEBRA 91 ENGINE 2 3/4DIA- SPINNER AEROCOMPOSITES COWLING SCALE TO FIT 1/2 MAPLE ENGINE MOUNT . RECHESlOF-2 2 1/32 PLYWOOD FUSELAGE DOUBLER FROM F-I BELLY N IS CEMENTED 10 BOlTOM OF WING FIRST -24 SCREWS TO SECURE WING THRU 5/8 DOWELS 3A6 DOWELS IMBED INlO FOAM TO ANCHOR L G I/4 PLYVOD PLATFORM FOAM CORE IN RUDDER AND FIN II/4X3/4TE /16 PLYWXfl BOX3/16 X 1/4 FIN POSTI ENCASES STABILIZER1/16 SHEETING 5A6 DOWELS LOCKBALSA RUDDER FOST 1N TO FUSELAGE 3 /8 SQTOP ANDALL SCREWS HERE 3011DM FAIRLEAD 5/ 1600 WELFOR HORN 4-40 SCREWS MOUNT FIN BASETO BOX 4 BALSA DORSAL FOAM CORES / // WS I\~IssFiNPOST /GOLDBERG1/4 X 1/2 BALSA STABLIZER LE 5/16 DOWEL- 3/32 HOLE FOR HORN 1 1/2 DIA TAILWHEEL 1/4 SQ DIAGONALS 1/8 BALSA SIDE RINELS F-I 10 TAL3/16u X 3/8 BOTTOM KEEL V4SQ BOTTOM LONGERONS 10-24 REAR WING HOLD SCREVJS ThRJ 5/8DOWELS 1/8 MUSIC WIRE TOI/I& SHEET BALSATOP AND BOTfOM AILERON SERVOSV16 X 1/4 CAP STRIPS OVER FOAM 1 1/2 TRAILING EDGE STOCK DOUBLED FOR AILERONS 2 RETRACTABLE BELLCRANK ON 1/8 PLYWOOD PLATFOFA 1/4 X BALSA LEADING EDGEHOLLOWED BALSA BLOCK 3DIA MAIN WHEELS SOUTHERN RETRACT SYSTEM FROM SERVO POWER ONLY February 1980 15 1/4 HARD BALSA SPAR FRONT AND REAR TOP AND BCIlTCM inertia insure crisp totally controllable rotations aircraft about its axes finally settled Zlin 526 AS basis project 526 AS singleplace aerobatic low wing faired-in canopy in-line engine wing fairly high aspect ratio implies good roll damping leading edge swept straight trailing edge resulting wing sweep about 4 degrees Thrust line wing horizontal tail separated vertically very much usually means control coupling less likely Vertical tail size large enough scale directly horizontal tail size increased span chord maximum allowable 15% scale engine cowl allowed very neat inverted instal lation Webra 91 chosen power Finally retractable landing gear real aircraft allowed us include feature model well course airplane can improved made some subtle changes within rules hopes achieving model would fly con siderably better true scale replica Sym metrical airfoils substituted wing shortened its aspect ratio reduced widening tip chord wing also moved forward inch lengthen tail moment improve balance thrust line horizontal tail lowered wing raised slightly order bring surfaces nearly line thrust vector width fuselage reduced 15% canopy moved forward inch help knifeedge flight Strip ailerons substituted full-size aircrafts conventional ones horizontal tail increased chord span improve tail volume coefficient other aspects aircraft true scale very close including fuselage cross section aircraft sized 950 sq well over minimum quite bit smaller some other airplanes turned up Vegas weight goal set 9 pounds achieved would result excellent vertical per formance Webra 91 first version built-up wing vertical fin second 526 AS built Steve Rojecki foam wing cut out resemble rib structure added balsa spars sheeting wound up open framework foam wing closely resembling built-up version Both airplanes MonoKote Solar Film covered Epoxypainted fiberglass cowls custom molded canopies added complete vehicles both weighed 8 pounds ready fly minus fuel Initial flights both aircraft very encour aging obvious efforts achieve low angular inertia minimum weight paid off Square corners sharp clean precise starting stopping rolling maneuvers successfullly accomplished airplane fast highly desirable quality flying nearly constant speed high drag large airframe slowed down dives engine pulled vertically little sag due its low 16 Model Aviation Aft fuselage detail showing dowel holes screws attaching tail section Rudder pushrod attaches internally tail-wheel arm steering Larger size models permit flexibility structural design Underside detachable tail Three large holes pruvue eiuu tu ue screws attach fin stabilizer Two holes rear screws attach entire unit fuselage Using Southern RC retractswith Fox wheelsgear swings aft rather sideways duplicate retractable function real craft Servo installation wing aileron servo rear retract servo forward Bands hold screws place fuselage equipment bay dwarfs servo tray receiver forward batteries located under servo tray Note pushrods aluminum tubing weight reliability inside outside snapping maneuvers improved moving center gravity back its current location shown plans snaps also enhanced wing itself airfoil gets thinner toward tip leading edge sharpens outboard Both airplanes flown 1978 Tourn ament Champions new Prototype Pattern original built author flown 14th place finish Don Lowe other built Steve Rojecki flown Steve capacity pattern demonstration flier Steve competitor flew full pattern before judges during training beginning round official flying idea establish base flight judges rather have react differently first few flights round Steve probably got assignment proven flying abilities also because rare individual invited competitor did have qualified airplane event As case new events rules Vegas Prototype Pattern provisional subject change improvement based success first event rules changed 1980 Zlin 526 AS pre sented no longer eligible Vegas too small now minimum size mono plane has increased 1100 sq since Vegas invitational event limited about 25 select competitors unlikely would have built purpose Zlin 526 AS remains attractive model stand-off scale events 60 91 offers exciting bonus full aerobatic capability Construction Its always best tackle toughest building chore first. Normally means wing case fuselage rates first attention fuselage complicated its simulation real airplanes fabric covered longeron structure its provisions removable tail section tail separates fuselage make transporting airplane easier vertical fin may attached fuselage horizontal installed some reason wanted transport fuselage intact elevator halves sticking out happen have ample vehicle like van station wagon dont plan ship airplane Nevada year recom mend build permanent fixed tail surfaces reduces complexity saves weight eliminating lot plywood get started fuselage bulkheads Fl F2 two motor mounts 1/4 sq cross brace 1/16 floor between bulkheads Fl F2 assembled unit using slow setting epoxy Bulkheads F3 through F7 built up sa overlapping corner joints Add doublers join fuselage halves bulkheads F3 through F7 fuselage upside down flat building board aligned top view plans Add bulkheads F8 F9 after removing fuse lage board Before adding forward bulkhead unit epoxy aware fuselage sides will form hour glass top view unit added looks strange requires some good clamping possibly wet ting sides accomplish required order fair longeron-type aft fuselage struc ture smooth-sided nose structure Editors Note consider Zlin super aircraft skilled pilot wants something bit d/ferent special both personaiship heflies andfor highly realistic maneuvers can perform ft took little doing bring together Don Lowe Phoenix Marks given dashing off magazine projects developed design worked out Ken Don pooled wits ship built Ken pilot Lowe last saw Ken fly 1966 meet da4 Vince afellowRC oldtimer sur prised high level workmanship excellent writing long articleand would kits have such fine instructions Weve eliminate another article issue avoid diluting Kens copy top off Don Lowe did climactic commentay based upon piloting experiences basic fuselage box completed upper lower partial bulkheads added Next install 1/4 sq diagonal braces bottom fuselage add sq longerons point sq longerons top bottom edges fuselage sides glued place Fuselage top sheeting installed six pieces Two pieces 1/16 form turtledeck Four pieces 3/32 form top sheeting forward canopy Cross grain ting installed cockpit floor bottom nose after gas tank has installed Note Fuelproof entire gas tank compartment coat epoxy Add four pieces /4 balsa sheet two tail two above wing leading edge help fair longerons tailpost nose Cut wing saddles sheet glue fuselage Add ongerons fuselage sides epoxy plywood gussets strengthen motor mounts Before gluing om sheeting between F8 F9 tail wheel mount bolted F8 Also incorporating detachable tail ood plate should installed aft F9 back fuselage should faced 1/16 plywood flat surface removable tail sits covered 1/16 ply center has cut out aft section fuselage sanded such flat panels Monokote result covered flat upper enter ext center ower ower sq ower longeron finally / sq longeron middle 3/16 om central longeron t back fuselage beveled tapered fair sq longerons back tailpost t above wing leading edge faired sq wing saddle its rear edge feathered fuselage side its forward edge saddle sanded k its aft end about 3/16 thick its forward Continued page 102 February 1980 17 jetacnanie tail aetall shown align ment dowels parting line between vertical fin horizontal tail Ken Bonnema displays bottom ship can admire its color schemebit wild what Looking Better Silicone Tubing LUE LINE Its Thicker Stronger Highly Heat Resis tant Flexible other fuel lines Whats moreBLUE LINE eith er equal lower price others So dont fooled Remember ask original BLUE LINE tubing Send SASE today free catalog fine products El O7kENZ2 44W Prospect St New Haven Conn 06515 PRODUCTS safety radio control flying club needs some system aasure two transmitters same frequency notturnedon same time An orderly system does much avoid looks panic shouting flight lineor worse Generation Products producing com plete set engraved high quality frequency pins club use pins check hoard flight line moments panic can avoided frequency pins made high quality engravers plastic sandwich-like con struction numbers engraved cutting through top layer plastic thereby exposing second layer No paint used no fading wearing away numbers pin contains frequency number also color-codedtO match theflags transmitter Construction pins first rate set should stand up club use considerable time period product review product review product review ZIin/ Bonnema continued page 1 7 edge meets t al fin sanded Monokoted glued after rest fuselage has Monokoted Epoxy wing hold-downs drill yet Wing plans show foam wing mainly cause much simpler build no weight penalty occurred between Rojeckis foam wing built up version original wing half should cut lb/cu ft density foam block least 5 inches thick blocks faced foam wire cutter insure square Align root tip templates block absolutely no twist include dihedral raising centerline tip rib 070 inches above centerline root rib Locate root rib exact same place both blocks wing halves may joined blocks flat surface later Cut out core including spar notches using hot-wire bow Number rib templates before hand equal chord percentage segments hot wire may drawn past identical chord stations times both root tip templates After cores have cut blocks cut Out two templates cardboard thin plywood cutouts cores Place cores back blocks sandwich together place template side cut open areas push piece 1/16 music wire through spaces cut out Slip center-drilled piece l rod over end wire attach current regulated hot leads outside dowels Holding new hot wire wooden dowels run around inside templates thus cutting out area removed Repeat procedure cutout area Tapered spars cut very hard a glued cores Titebond epoxy Keep cores blocks weighted flat surface spars dry Next cut out landing gear unit clearance wheel wells servo boxes linkage channels copper wire forms placed heavy duty soldering gun Epoxy landing gear mounting plates 4-40 blind nuts already installed plates have four 3/16 dowels pro truding down foam extra gluing area added strength Glue bellcrank mounts install bellcranks landing gear linkage Sheet center section leading edge trailing edge 1/16 balsa sheet Slow setting epoxy sparingly applied balsa recommended Spreading epoxy foam does improve bond does add considerable weight Again set cores back blocks weight flat surface sheeting drying After sheeting dry trim excess sand flush foam Add tip blocks 3/16 trailing edge ing edge cap strips Remove sheeting has covered wheel well landing gear cavity Join wing halves flat surface epoxing center section both halves resting foam blocks Weight allow adequate time epoxy set up Ailerons laminated two pieces 1 trailing edge stock glued together longest surface longest surface leading edge bevel get quite enough must sanded allow sufficient aileron throw dowel drilled embedded aileron near root aileron horns essential An experiment 3/32 wire resulted aileron flutter fixed portion wing trailing edge lying between two ailerons laminated balsa sheet Clearance notched front piece Install aileron horn wires brass nylon guides before gluing central trailing edge section Drill holes clear through wing epoxy four ls have drilled through 3/16 wing bolts Sand flush upper lower surfaces wing reinforce wing center section wrap first layer 7-oz fiberglass cloth layer 2oz cloth Drill through hardened fiberglass open wing bolt holes Set wing fuselage align very carefully Run long 3/16 drill through bolt holes already wing drill through plywood wing mounting plates fuselage Remove wing enlarge holes fuselage plates install 10-24 blind nuts Bolt wing fuselage build up belly pan aligns perfectly fuselage Use paper tubes bolt guides through belly pan Cut away fiberglass balsa sheet covering servo box install rails aileron retract servos Rib spacing built up wing shown plans Using tip root templates provided sandwich 15 pieces 3/32 baisa between templates sand stack down form ribs wing half Spar location size un changed foam wing Leading edge trailing edge sheeting cap strips also un changed 1/16 balsa vertical grain spar webbing glued between ribs both front rear spars landing gear mount system shown can used ribs either side must reinforced plywood Wheel wells must built up 1/16 balsa sheet Ailerons tips center section including fiberglass reinforcement unchanged Tail Surfaces Foam cores vertical fin rudder stabilizer elevator cut using templates provided 1 / 16 sheeting epoxied wing surfaces left dry weighted foam blocks flat table Leading trailing edges tip blocks glued after sheeting has trimmed sanded Note 3/16 vertiial fin trailing edge exception glued foam core before sheeting sheeting overlaps Elevators rudder have l installed drilled 3/32 wire control horn joined stabilizer halves wrapped fiberglass cloth shown plans fol lowing steps must adhered 102 Model Aviation Available im 5 sizes fit appli cation about 59 per ft Shown above SUPER BLUE set upwith extra-large tubing 4 reusable ties & end-of-line nozzles $369 per pkg nrnrIiut review nrnduat review nrnduat review Frequency Pins @ $2500/ set Generation Pro ducts Co. Inc. 5512 Southwood Little Rock AR 72205 incorporating removable tail Spot glue mating piece 1/16 ply top plywood tail mounting surface fuselage upper piece should about shorter fuselage piece front edge piece glue another piece 1/16 ply matches upper middle quarter F8 including two 3/16 dowel holes Insert two 3/16 dowels through holes glue plywood floor glue dowels F8 back edge plywood floor glue F9A balsa Glue a lower saddles stabilizer Align stabilizer carefully glue saddles Glue a upper stabilizer saddles cap top saddles 1/16 plywood should now have box structure completely surrounding stabilizer plywood bottom top front balsa back break fuselage yet Spot glue another piece 1/16 plywood top box structure front edge piece glue piece plywood matches uppermost portion F8 including 3/16 dowel hole Also glue two blocks ood top plywood floor shown plans Drill 4-40 clearance hole through center front block clear through stabilizer box Drill two 4-40 clearance holes through rear block again clear through stabilizer box Enlarge three holes ply blocks install 4-40 blind nuts Insert piece 3/16 dowel through its hole glue plywood floor glue dowel F8 Now spot glue piece ood original 1/16 plywood tail mounting surface half-inch space left open behind stabilizer box k should fill entire space should 1/16 short width both sides Drill two 4-40 clearance holes through block through corresponding block fuselage underneath Enlarge holes upper block install two 4-40 blind nuts Now glue piece 1/16 plywood matches back face stabilizer box ood piece just installed 1/16 plywood floor spot glued top stabilizer box glue piece stabilizer box Now take sheeted vertical fin its extended hinge line post cut clearance bottom two plywood blind nut blocks 3/16 dowel mounted upper plywood floor Trim rudder post just contacts plywood blind nut block behind stabilizer box trim vertical fin sheeting fits over outside edges plywood block lines up fueslage sides Glue vertical fin upper plywood floor plywood pieces behind stabilizer box careful glue vertical fin assembly stabilizer box Glue sandtwo balsa blocks fair vertical fin F8 Finally add a dorsal fin assembly dry separate vertical fin assembly fuselage stabilizer box using razor blade break spot glue joints separate stabilizer box fuselage same way Enlarge three holes stabilizer box its lower side holes should opened up lower plywood floor stablizer itself enlarge holes upper plywood cap Glue paper straws act screw guides Now can sit back relax curse yourself building fixed tall fix tail surfaces simply eliminate plywood pieces enlarge balsa pieces accordingly glue everything together permanently Finishing Monokote Solar Film strongly recommended materials closely simulate fabric covering full-scale airplane offer lightest overall weight complete finish fiberglass engine cowl molded cellu lose acetate canopy available Aero composites Corp 411 Townsend Place Dayton 0hio4543 1 cowl frameworkmolded canopy painted match Mono kote colors used paint scheme OK WKE represents Czechoslovakian Team colors other airplane shown done British Aerobatic Team colors Since countries fly Zlin large variety color scheme options choose Installation Radio installation fairly straight forward use 60 stow flight pack battery above gas tank 91 locate battery above servo tray further aft necessary achieve proper CG receiver foam wrapped sits fuselage bay just front servo tray Aileron retract linkage shown drawings plans show independent control horns elevator half require pushrod exits rear fuselage both sides M alternative elevator halves may joined central horn single pushrod concealed fuselage rudder pushrod may attached internally tail wheel steering arm before exits fuselage side its way back rudder Flying 526 AS Zlin designed high-performance machine capable perform ing AMA FAI Vegas Tournament maneuvers Flying aircraft pure pleasure difficult considering its very high performance potential Takeoffs piece 104 Model Aviation Please send mecopies new 5th edition Radio Control Buyers Guide Enclosed $825 copy ordered $725 retail plus $100 postage & handling City State ZIP Return RC Buyers Guide Clifton House Clifton VA 22024 Purchasing R/C Aircraft easy YOUNIQUE AT Hobby Capitol keep large ready supply Custom-But RC Aircraft Kits Engines RC Units times And. thanks years experience dealing people sections US. prepare special one-of-a-kind RC Aircraft special one-ofa-kind RC flyer demands unique look express tastes Chances youll find custom paint finish exquisite detailed cockpit interiors glassed engine compartments real scale wheels custom grilled nose section will knock socks offi l probably never see another like cause Hobby Capitol expert stressed preparation goes far beyond standard checkout RC shoppers turning up increasing numbers convenient showroom because word out. outstanding buys service finest selection unique RC Aircraft anywhere its HOBBY CAPITOL Old Ignition Trade-in Buy sell old time ignition engines Box up what yau have send us honest appraisal could worth new proportional set have engines can also start collection welcome built-up airplanes used proportionals old time ignition engines Come trade us Top dollar Custom-1311t-RjC Built Order Plans Ft stock choose Its s40000 PIp TrI-Pocm Quorter-ale 89 wingspan 42 Sq Ft detajied dans $1699 PP nd $100 self addressed stomped envelope detoiled list Built-Up R/C Models 50% Sole Hobby Capitol 46 N Oak St Ventura CA 93001 Phone 805 643-7616 642-8465 cake Landings require little care prevent tip stall still very slow generous wing area would recommend drag nose high however Super docile land ings could achieved some sacrifice snapping capability blunting wing leading edge toward tip can play its performance potential starting forward CG slowly moving back improve snapping roll characteristics used fairly aft CG location get very best performance snaps rolls also worked bit wing incidence engine thrust line zero-zero set up works well little bit engine right thrust ease torque effects Speaking torque Webra 91 pulls aircraft along ease using 14-6 7 prop used non-stock 60-size Perry pump carburetor Webra since will turn 10500 11000 carb prop choice becomes critical Vertical performance first thing suffer engine prop mismatched large high-drag airplanes like recommend very stiff torque pushrods throughout since control loads high will want use husky servos extremely tight centering resolution have found big ships rapid pot wear occurs servos tight due control loads increased control surface dither Fortunately will find large slow aircraft tolerant control dead-band high-speed pattern ships Im sure will especially appreciate very tight looping cornering capability Zlin large wing low wing loading will give spectacularly tight square loops Rolling maneuvers will require little work standard pattern ship due reduced airspeed smaller power loading somewhat shortcoupled design Youll find other large slower aircraft require increased proficiency rudder part pilot really feel will enjoy flying Zlin because combines realistic good looks fine aerobatic performance What could modeler ask Trans America Riches continued page 24 necessary know would no flying Wednesday made two Wed nesdays row After awards presentation motel Meridian team first 3 minutes ahead number 2 Montgomery team officials off Jackson MS start next leg high winds bothering Riches pick up worse Saggin Wagon AMA motorhome Bob Roach drove bad left rear spring causing perpetual lean hence Saggin Wagon weather clearing Jackson reports pretty good next morning didnt help Jimmy Grier tonight Three team members airplanes still Chicago Jerry Nelson have Jackson already planes Hurricane Frederick delayed slightly would early next morning Doc Edwards Jimmy takeoff area early rest Team 3 BTHOOM Team wasnt Jimmys Cessna somewhere between Chicago Jackson didnt look good though up until around 2 am fixing Docs truck pilot vehicle borrowed lead vehicle didnt look BTHOOM team going make alone ask what BTHOOM team Jimmy Grier asked what name team replied after slight delay Beats Hell Out other four teams off away frontage road takeoff area still no planes Jimmys team no rest team did arrive frantic rush get ready air being taped TV crew arrived late teams ran close part leg passing other pit stops teams good times team work payed off though three planes crashed Everyone ready takeoff West Monroe LA mayor hand see planes off police help teams get through traffic lights onto freeway fire department added nice touch hot coffee everyone Bob Roach much happier now wife Sue joined him Jackson would take care selling chances Pitts Special souvenirs rest trip As usual days flights uneventful Murphys Law again teams close coming Sharks field Bossier City LA Shreveport club big recep tion barbecue ready police escort freeway field big help did cause some confusion Doc Edwards trying get lead vehicle ahead guide Team 3s pilot vehicle landing area police car raced past going other direction siren wailing lights flashing police car made abrupt U-turn Doc jammed brakes let pass As Doc watching pull alongside thought bought sure policeman leaned Out window big sweeping motion arm yelled Cmon lets make Doc told Doris little later lucky have coronary Team 5 Sharks Club team fittingly received champagne first team top honors leg Shreveport John Embry AMA VP District VIII Ba Kinch Lake Charles club joined race CDs volunteered fill last minute vacancies leg Bo continue Abilene TX help out flight Shreveport Dallas long makes pit stops possible trouble Out five started Kellys Truck Stop morning four made no normal number problems broken props bent landing gears deadstick landings lost hatches crash two addition morning briefings Dont wear race hats back pilot vehicles tying Because no going lose valuable time retrieving race route well marked lost blue-and-white hats flight Mesquite Model Field Ft Worth uneventful five planes made short flight about 50 miles good time high point takeoff Mesquite reading proclamation mayor Dallas AMA past president Johnny Clemens along mayor pro tem Mesquite gave planes good send off landing Tarrant County Junior College landing area Fort Worth Jim Simpsons Southwest Modelers RC Club team least number problems took first place hardware three half minutes ahead John Kikers NASA Flyers Houston takeoff Ft Worth Wednesday 106 Model Aviation
Edition: Model Aviation - 1980/02
Page Numbers: 10, 11, 12, 13, 14, 15, 16, 17, 102, 104, 106
NO OCR TEXT NO OCR TEXT I SCENT I- I CSKCBc-CO lICK I I, ROCK-~c Alliii II JfpgTiC rI ICSONOOK PSFT IllsP5060110 0* FROB 106F0OOSKICK 0300 3~CO NKKKCOAIE01ItQS3i l&LCMCOCOBCCSOKSAL FIN SINK OKOCCISO ICSO0 PLOICSPLO0-00' r OCIKOO3KL573 OC OKKOKII OOEKLOCOSIK I..KOONlFS2PLO ICC SOUK 04013 pOKOOmI 40530 TMOSOKKL Naturally enough Don felt should seek aircraft similar layout Phoenix Zlin 526 726 series offered variety designs somewhat like Phoenix low-wing long-tail moment vehicles slightly swept wings Just finding full-scale aerobatic bird lines along success ful model design going enough however arrive winning design totally new event purpose avoid model flying characteristics stress scale realism decided go large light Large add realism presentation ease attitude recognition pilot judge Also large add drag slower flight again realism also help keep airplane 1200 box maneuvers performed Light weight considered essential vertical performance minimizing wing loading would allow sharp square comers flaps Another advantage light weight aerobatic aircraft Seen rear color-scheme lines emphasize feeling forward motion tenna strung stabilizer tip 12 Model Aviation Well-executed nose cowling really mean much Details ot tibergiass cowi snow up we. shotnote handling 4.m asn4 tho *sonInn Mir nnnnmnfl Just another picture provide another eyeview sne color scneme 11101 IS unarime Brown no Ice Mnlc fInuthrnusnl mumfflsr FULL SIZE PLANS AVAILABLE SEE PAGE 128 AICASONS LOAPJC/KAILWAASE7$5/SKOAKL PSOAOPCO oocsocxPSCMSATSSIALCCT n5/NACENT SAC III I S/SFLAT TOP SSAOSOLrCI S/A ISOCK 50 P55COMAI/ASPASTAPESS ACAS STACK SPACES/L/5S/SEALKM /LOS OP S/TA SCT P575555 ALLSACA SOOT ASK CT1 COT SACS/SBEAPtATPS SANK STACK1-U ACTAC PAN SCAM MASKS SAS TON ONE COLT AK/Sot5Ao5~OS MONET - X SET *I-2PM51 SAra S/lA SONTAIIfiAAA1AM NE iS/IA CSIAL-0515451C jF 05/IS ACAECttP tIZVCN II /S/ AGEMACAT POAS COATCCCNACCS~ SACASOC OCITSJ PANEL/Cl PS SIS/INOS ICS1/AMALSOp55 PCS 5/5505/SPM/CPBS MELLC PA ACCOLH OAMCS~ SOMI I/A SNUASO I I/S PCCI/A CCC Ii~2F /6II-I/-6-/vII//OSSOASK ACOOCENLACACICS OPI X KOCCOAOKkC /0 POSECCOK NOES _____________________________________________ III ThI jO fli AI EL PM II/A A/ALE MOCCA MO/NTCUT FRAN/NPUSECSOE ASKS IK SESOLOSCEKTSICK/AC PLO 00/MAPS/NO SOEKC IT IPASACNRO lASS PEAPSACALPSKLTION 00 I/S MACSMPTACONPSO7T- NOKOSjS/AC SOAPS rIIU/SSSOAAK~~ I/AS/C/ASS0I U[I II pIFS / H0500050/SC C/SPATS NOCCIOMA010 1/SOPLO1/ [ CUCTACAC 5/ASCOEC I I/N So/SECSET KACM/SF jMgj0I/SPLO5~ ISN-IS I/SNCUOSE] NLAOS CANE II / MOSPANI I/SN/C/COCKI/SM/AIOiMSj-ACOAS ~CUASE S SUNKCUT PACM I/S N/SECI II/MM/TO/CNL ASK CANOPY SE/CP1no 0550 CASASSICTS N/ASS/SN I CKASNKSO PLACE ----S often overlooked reduction inertia property also opposes cessation characteristics exactly what dont want angular moments inertia rotation airplane already rotating event precision point rolls snap An angular moment inertia mass property other words airplane high angular rolls required 3T maneuvers aircraft oppotes its rotation about moment inertia roll hard start rolling keeping structural weight absolute either its yaw pitch roll axis same difficult stop rolling once starts minimum could reduce moments February 1980 13 I I unsandL A/SSBCONAC /SSASSAC US SEA resmivemy simpie details complete tail detaches two separate pieces SACS ISS/odS 555 SES/Sy uc aeparaoeo orom inc stanhlizer reattached fuselage dowel two screws Facilitates transport i ysHIToo rU L 5QUARE RETRACT BEAM OUT TO BLOCS PLODD 5H0W 0 Up d\m ALTERNATE WING CONSTRUCTiON IS 3/3Z BALSA RIBS WITH SAME SPARS LEADING TRAILING EDGES 3/32 SHEET FRONT CECKING AEROCOMPOSITE CANOPY RUDDER & ELEVAlOR NYRODS TO SERVOS 3/8 BALSAN MIDDLE FAIRLEAD 6CKTO TAlL FOUR NO 2 SCREWS SECURE COWLING TO FUSELAGE I/8PIWJOD GUSSETS lOP AND BOTTOM WEBRA 91 ENGINE 2 3/4DIA- SPINNER AEROCOMPOSITES COWLING SCALE TO FIT 1/2 MAPLE ENGINE MOUNT . RECHESlOF-2 2 1/32 PLYWOOD FUSELAGE DOUBLER FROM F-I BELLY N IS CEMENTED 10 BOlTOM OF WING FIRST -24 SCREWS TO SECURE WING THRU 5/8 DOWELS 3A6 DOWELS IMBED INlO FOAM TO ANCHOR L G I/4 PLYVOD PLATFORM FOAM CORE IN RUDDER AND FIN II/4X3/4TE /16 PLYWXfl BOX3/16 X 1/4 FIN POSTI ENCASES STABILIZER1/16 SHEETING 5A6 DOWELS LOCKBALSA RUDDER FOST 1N TO FUSELAGE 3 /8 SQTOP ANDALL SCREWS HERE 3011DM FAIRLEAD 5/ 1600 WELFOR HORN 4-40 SCREWS MOUNT FIN BASETO BOX 4 BALSA DORSAL FOAM CORES / // WS I\~IssFiNPOST /GOLDBERG1/4 X 1/2 BALSA STABLIZER LE 5/16 DOWEL- 3/32 HOLE FOR HORN 1 1/2 DIA TAILWHEEL 1/4 SQ DIAGONALS 1/8 BALSA SIDE RINELS F-I 10 TAL3/16u X 3/8 BOTTOM KEEL V4SQ BOTTOM LONGERONS 10-24 REAR WING HOLD SCREVJS ThRJ 5/8DOWELS 1/8 MUSIC WIRE TOI/I& SHEET BALSATOP AND BOTfOM AILERON SERVOSV16 X 1/4 CAP STRIPS OVER FOAM 1 1/2 TRAILING EDGE STOCK DOUBLED FOR AILERONS 2 RETRACTABLE BELLCRANK ON 1/8 PLYWOOD PLATFOFA 1/4 X BALSA LEADING EDGEHOLLOWED BALSA BLOCK 3DIA MAIN WHEELS SOUTHERN RETRACT SYSTEM FROM SERVO POWER ONLY February 1980 15 1/4 HARD BALSA SPAR FRONT AND REAR TOP AND BCIlTCM inertia insure crisp totally controllable rotations aircraft about its axes finally settled Zlin 526 AS basis project 526 AS singleplace aerobatic low wing faired-in canopy in-line engine wing fairly high aspect ratio implies good roll damping leading edge swept straight trailing edge resulting wing sweep about 4 degrees Thrust line wing horizontal tail separated vertically very much usually means control coupling less likely Vertical tail size large enough scale directly horizontal tail size increased span chord maximum allowable 15% scale engine cowl allowed very neat inverted instal lation Webra 91 chosen power Finally retractable landing gear real aircraft allowed us include feature model well course airplane can improved made some subtle changes within rules hopes achieving model would fly con siderably better true scale replica Sym metrical airfoils substituted wing shortened its aspect ratio reduced widening tip chord wing also moved forward inch lengthen tail moment improve balance thrust line horizontal tail lowered wing raised slightly order bring surfaces nearly line thrust vector width fuselage reduced 15% canopy moved forward inch help knifeedge flight Strip ailerons substituted full-size aircrafts conventional ones horizontal tail increased chord span improve tail volume coefficient other aspects aircraft true scale very close including fuselage cross section aircraft sized 950 sq well over minimum quite bit smaller some other airplanes turned up Vegas weight goal set 9 pounds achieved would result excellent vertical per formance Webra 91 first version built-up wing vertical fin second 526 AS built Steve Rojecki foam wing cut out resemble rib structure added balsa spars sheeting wound up open framework foam wing closely resembling built-up version Both airplanes MonoKote Solar Film covered Epoxypainted fiberglass cowls custom molded canopies added complete vehicles both weighed 8 pounds ready fly minus fuel Initial flights both aircraft very encour aging obvious efforts achieve low angular inertia minimum weight paid off Square corners sharp clean precise starting stopping rolling maneuvers successfullly accomplished airplane fast highly desirable quality flying nearly constant speed high drag large airframe slowed down dives engine pulled vertically little sag due its low 16 Model Aviation Aft fuselage detail showing dowel holes screws attaching tail section Rudder pushrod attaches internally tail-wheel arm steering Larger size models permit flexibility structural design Underside detachable tail Three large holes pruvue eiuu tu ue screws attach fin stabilizer Two holes rear screws attach entire unit fuselage Using Southern RC retractswith Fox wheelsgear swings aft rather sideways duplicate retractable function real craft Servo installation wing aileron servo rear retract servo forward Bands hold screws place fuselage equipment bay dwarfs servo tray receiver forward batteries located under servo tray Note pushrods aluminum tubing weight reliability inside outside snapping maneuvers improved moving center gravity back its current location shown plans snaps also enhanced wing itself airfoil gets thinner toward tip leading edge sharpens outboard Both airplanes flown 1978 Tourn ament Champions new Prototype Pattern original built author flown 14th place finish Don Lowe other built Steve Rojecki flown Steve capacity pattern demonstration flier Steve competitor flew full pattern before judges during training beginning round official flying idea establish base flight judges rather have react differently first few flights round Steve probably got assignment proven flying abilities also because rare individual invited competitor did have qualified airplane event As case new events rules Vegas Prototype Pattern provisional subject change improvement based success first event rules changed 1980 Zlin 526 AS pre sented no longer eligible Vegas too small now minimum size mono plane has increased 1100 sq since Vegas invitational event limited about 25 select competitors unlikely would have built purpose Zlin 526 AS remains attractive model stand-off scale events 60 91 offers exciting bonus full aerobatic capability Construction Its always best tackle toughest building chore first. Normally means wing case fuselage rates first attention fuselage complicated its simulation real airplanes fabric covered longeron structure its provisions removable tail section tail separates fuselage make transporting airplane easier vertical fin may attached fuselage horizontal installed some reason wanted transport fuselage intact elevator halves sticking out happen have ample vehicle like van station wagon dont plan ship airplane Nevada year recom mend build permanent fixed tail surfaces reduces complexity saves weight eliminating lot plywood get started fuselage bulkheads Fl F2 two motor mounts 1/4 sq cross brace 1/16 floor between bulkheads Fl F2 assembled unit using slow setting epoxy Bulkheads F3 through F7 built up sa overlapping corner joints Add doublers join fuselage halves bulkheads F3 through F7 fuselage upside down flat building board aligned top view plans Add bulkheads F8 F9 after removing fuse lage board Before adding forward bulkhead unit epoxy aware fuselage sides will form hour glass top view unit added looks strange requires some good clamping possibly wet ting sides accomplish required order fair longeron-type aft fuselage struc ture smooth-sided nose structure Editors Note consider Zlin super aircraft skilled pilot wants something bit d/ferent special both personaiship heflies andfor highly realistic maneuvers can perform ft took little doing bring together Don Lowe Phoenix Marks given dashing off magazine projects developed design worked out Ken Don pooled wits ship built Ken pilot Lowe last saw Ken fly 1966 meet da4 Vince afellowRC oldtimer sur prised high level workmanship excellent writing long articleand would kits have such fine instructions Weve eliminate another article issue avoid diluting Kens copy top off Don Lowe did climactic commentay based upon piloting experiences basic fuselage box completed upper lower partial bulkheads added Next install 1/4 sq diagonal braces bottom fuselage add sq longerons point sq longerons top bottom edges fuselage sides glued place Fuselage top sheeting installed six pieces Two pieces 1/16 form turtledeck Four pieces 3/32 form top sheeting forward canopy Cross grain ting installed cockpit floor bottom nose after gas tank has installed Note Fuelproof entire gas tank compartment coat epoxy Add four pieces /4 balsa sheet two tail two above wing leading edge help fair longerons tailpost nose Cut wing saddles sheet glue fuselage Add ongerons fuselage sides epoxy plywood gussets strengthen motor mounts Before gluing om sheeting between F8 F9 tail wheel mount bolted F8 Also incorporating detachable tail ood plate should installed aft F9 back fuselage should faced 1/16 plywood flat surface removable tail sits covered 1/16 ply center has cut out aft section fuselage sanded such flat panels Monokote result covered flat upper enter ext center ower ower sq ower longeron finally / sq longeron middle 3/16 om central longeron t back fuselage beveled tapered fair sq longerons back tailpost t above wing leading edge faired sq wing saddle its rear edge feathered fuselage side its forward edge saddle sanded k its aft end about 3/16 thick its forward Continued page 102 February 1980 17 jetacnanie tail aetall shown align ment dowels parting line between vertical fin horizontal tail Ken Bonnema displays bottom ship can admire its color schemebit wild what Looking Better Silicone Tubing LUE LINE Its Thicker Stronger Highly Heat Resis tant Flexible other fuel lines Whats moreBLUE LINE eith er equal lower price others So dont fooled Remember ask original BLUE LINE tubing Send SASE today free catalog fine products El O7kENZ2 44W Prospect St New Haven Conn 06515 PRODUCTS safety radio control flying club needs some system aasure two transmitters same frequency notturnedon same time An orderly system does much avoid looks panic shouting flight lineor worse Generation Products producing com plete set engraved high quality frequency pins club use pins check hoard flight line moments panic can avoided frequency pins made high quality engravers plastic sandwich-like con struction numbers engraved cutting through top layer plastic thereby exposing second layer No paint used no fading wearing away numbers pin contains frequency number also color-codedtO match theflags transmitter Construction pins first rate set should stand up club use considerable time period product review product review product review ZIin/ Bonnema continued page 1 7 edge meets t al fin sanded Monokoted glued after rest fuselage has Monokoted Epoxy wing hold-downs drill yet Wing plans show foam wing mainly cause much simpler build no weight penalty occurred between Rojeckis foam wing built up version original wing half should cut lb/cu ft density foam block least 5 inches thick blocks faced foam wire cutter insure square Align root tip templates block absolutely no twist include dihedral raising centerline tip rib 070 inches above centerline root rib Locate root rib exact same place both blocks wing halves may joined blocks flat surface later Cut out core including spar notches using hot-wire bow Number rib templates before hand equal chord percentage segments hot wire may drawn past identical chord stations times both root tip templates After cores have cut blocks cut Out two templates cardboard thin plywood cutouts cores Place cores back blocks sandwich together place template side cut open areas push piece 1/16 music wire through spaces cut out Slip center-drilled piece l rod over end wire attach current regulated hot leads outside dowels Holding new hot wire wooden dowels run around inside templates thus cutting out area removed Repeat procedure cutout area Tapered spars cut very hard a glued cores Titebond epoxy Keep cores blocks weighted flat surface spars dry Next cut out landing gear unit clearance wheel wells servo boxes linkage channels copper wire forms placed heavy duty soldering gun Epoxy landing gear mounting plates 4-40 blind nuts already installed plates have four 3/16 dowels pro truding down foam extra gluing area added strength Glue bellcrank mounts install bellcranks landing gear linkage Sheet center section leading edge trailing edge 1/16 balsa sheet Slow setting epoxy sparingly applied balsa recommended Spreading epoxy foam does improve bond does add considerable weight Again set cores back blocks weight flat surface sheeting drying After sheeting dry trim excess sand flush foam Add tip blocks 3/16 trailing edge ing edge cap strips Remove sheeting has covered wheel well landing gear cavity Join wing halves flat surface epoxing center section both halves resting foam blocks Weight allow adequate time epoxy set up Ailerons laminated two pieces 1 trailing edge stock glued together longest surface longest surface leading edge bevel get quite enough must sanded allow sufficient aileron throw dowel drilled embedded aileron near root aileron horns essential An experiment 3/32 wire resulted aileron flutter fixed portion wing trailing edge lying between two ailerons laminated balsa sheet Clearance notched front piece Install aileron horn wires brass nylon guides before gluing central trailing edge section Drill holes clear through wing epoxy four ls have drilled through 3/16 wing bolts Sand flush upper lower surfaces wing reinforce wing center section wrap first layer 7-oz fiberglass cloth layer 2oz cloth Drill through hardened fiberglass open wing bolt holes Set wing fuselage align very carefully Run long 3/16 drill through bolt holes already wing drill through plywood wing mounting plates fuselage Remove wing enlarge holes fuselage plates install 10-24 blind nuts Bolt wing fuselage build up belly pan aligns perfectly fuselage Use paper tubes bolt guides through belly pan Cut away fiberglass balsa sheet covering servo box install rails aileron retract servos Rib spacing built up wing shown plans Using tip root templates provided sandwich 15 pieces 3/32 baisa between templates sand stack down form ribs wing half Spar location size un changed foam wing Leading edge trailing edge sheeting cap strips also un changed 1/16 balsa vertical grain spar webbing glued between ribs both front rear spars landing gear mount system shown can used ribs either side must reinforced plywood Wheel wells must built up 1/16 balsa sheet Ailerons tips center section including fiberglass reinforcement unchanged Tail Surfaces Foam cores vertical fin rudder stabilizer elevator cut using templates provided 1 / 16 sheeting epoxied wing surfaces left dry weighted foam blocks flat table Leading trailing edges tip blocks glued after sheeting has trimmed sanded Note 3/16 vertiial fin trailing edge exception glued foam core before sheeting sheeting overlaps Elevators rudder have l installed drilled 3/32 wire control horn joined stabilizer halves wrapped fiberglass cloth shown plans fol lowing steps must adhered 102 Model Aviation Available im 5 sizes fit appli cation about 59 per ft Shown above SUPER BLUE set upwith extra-large tubing 4 reusable ties & end-of-line nozzles $369 per pkg nrnrIiut review nrnduat review nrnduat review Frequency Pins @ $2500/ set Generation Pro ducts Co. Inc. 5512 Southwood Little Rock AR 72205 incorporating removable tail Spot glue mating piece 1/16 ply top plywood tail mounting surface fuselage upper piece should about shorter fuselage piece front edge piece glue another piece 1/16 ply matches upper middle quarter F8 including two 3/16 dowel holes Insert two 3/16 dowels through holes glue plywood floor glue dowels F8 back edge plywood floor glue F9A balsa Glue a lower saddles stabilizer Align stabilizer carefully glue saddles Glue a upper stabilizer saddles cap top saddles 1/16 plywood should now have box structure completely surrounding stabilizer plywood bottom top front balsa back break fuselage yet Spot glue another piece 1/16 plywood top box structure front edge piece glue piece plywood matches uppermost portion F8 including 3/16 dowel hole Also glue two blocks ood top plywood floor shown plans Drill 4-40 clearance hole through center front block clear through stabilizer box Drill two 4-40 clearance holes through rear block again clear through stabilizer box Enlarge three holes ply blocks install 4-40 blind nuts Insert piece 3/16 dowel through its hole glue plywood floor glue dowel F8 Now spot glue piece ood original 1/16 plywood tail mounting surface half-inch space left open behind stabilizer box k should fill entire space should 1/16 short width both sides Drill two 4-40 clearance holes through block through corresponding block fuselage underneath Enlarge holes upper block install two 4-40 blind nuts Now glue piece 1/16 plywood matches back face stabilizer box ood piece just installed 1/16 plywood floor spot glued top stabilizer box glue piece stabilizer box Now take sheeted vertical fin its extended hinge line post cut clearance bottom two plywood blind nut blocks 3/16 dowel mounted upper plywood floor Trim rudder post just contacts plywood blind nut block behind stabilizer box trim vertical fin sheeting fits over outside edges plywood block lines up fueslage sides Glue vertical fin upper plywood floor plywood pieces behind stabilizer box careful glue vertical fin assembly stabilizer box Glue sandtwo balsa blocks fair vertical fin F8 Finally add a dorsal fin assembly dry separate vertical fin assembly fuselage stabilizer box using razor blade break spot glue joints separate stabilizer box fuselage same way Enlarge three holes stabilizer box its lower side holes should opened up lower plywood floor stablizer itself enlarge holes upper plywood cap Glue paper straws act screw guides Now can sit back relax curse yourself building fixed tall fix tail surfaces simply eliminate plywood pieces enlarge balsa pieces accordingly glue everything together permanently Finishing Monokote Solar Film strongly recommended materials closely simulate fabric covering full-scale airplane offer lightest overall weight complete finish fiberglass engine cowl molded cellu lose acetate canopy available Aero composites Corp 411 Townsend Place Dayton 0hio4543 1 cowl frameworkmolded canopy painted match Mono kote colors used paint scheme OK WKE represents Czechoslovakian Team colors other airplane shown done British Aerobatic Team colors Since countries fly Zlin large variety color scheme options choose Installation Radio installation fairly straight forward use 60 stow flight pack battery above gas tank 91 locate battery above servo tray further aft necessary achieve proper CG receiver foam wrapped sits fuselage bay just front servo tray Aileron retract linkage shown drawings plans show independent control horns elevator half require pushrod exits rear fuselage both sides M alternative elevator halves may joined central horn single pushrod concealed fuselage rudder pushrod may attached internally tail wheel steering arm before exits fuselage side its way back rudder Flying 526 AS Zlin designed high-performance machine capable perform ing AMA FAI Vegas Tournament maneuvers Flying aircraft pure pleasure difficult considering its very high performance potential Takeoffs piece 104 Model Aviation Please send mecopies new 5th edition Radio Control Buyers Guide Enclosed $825 copy ordered $725 retail plus $100 postage & handling City State ZIP Return RC Buyers Guide Clifton House Clifton VA 22024 Purchasing R/C Aircraft easy YOUNIQUE AT Hobby Capitol keep large ready supply Custom-But RC Aircraft Kits Engines RC Units times And. thanks years experience dealing people sections US. prepare special one-of-a-kind RC Aircraft special one-ofa-kind RC flyer demands unique look express tastes Chances youll find custom paint finish exquisite detailed cockpit interiors glassed engine compartments real scale wheels custom grilled nose section will knock socks offi l probably never see another like cause Hobby Capitol expert stressed preparation goes far beyond standard checkout RC shoppers turning up increasing numbers convenient showroom because word out. outstanding buys service finest selection unique RC Aircraft anywhere its HOBBY CAPITOL Old Ignition Trade-in Buy sell old time ignition engines Box up what yau have send us honest appraisal could worth new proportional set have engines can also start collection welcome built-up airplanes used proportionals old time ignition engines Come trade us Top dollar Custom-1311t-RjC Built Order Plans Ft stock choose Its s40000 PIp TrI-Pocm Quorter-ale 89 wingspan 42 Sq Ft detajied dans $1699 PP nd $100 self addressed stomped envelope detoiled list Built-Up R/C Models 50% Sole Hobby Capitol 46 N Oak St Ventura CA 93001 Phone 805 643-7616 642-8465 cake Landings require little care prevent tip stall still very slow generous wing area would recommend drag nose high however Super docile land ings could achieved some sacrifice snapping capability blunting wing leading edge toward tip can play its performance potential starting forward CG slowly moving back improve snapping roll characteristics used fairly aft CG location get very best performance snaps rolls also worked bit wing incidence engine thrust line zero-zero set up works well little bit engine right thrust ease torque effects Speaking torque Webra 91 pulls aircraft along ease using 14-6 7 prop used non-stock 60-size Perry pump carburetor Webra since will turn 10500 11000 carb prop choice becomes critical Vertical performance first thing suffer engine prop mismatched large high-drag airplanes like recommend very stiff torque pushrods throughout since control loads high will want use husky servos extremely tight centering resolution have found big ships rapid pot wear occurs servos tight due control loads increased control surface dither Fortunately will find large slow aircraft tolerant control dead-band high-speed pattern ships Im sure will especially appreciate very tight looping cornering capability Zlin large wing low wing loading will give spectacularly tight square loops Rolling maneuvers will require little work standard pattern ship due reduced airspeed smaller power loading somewhat shortcoupled design Youll find other large slower aircraft require increased proficiency rudder part pilot really feel will enjoy flying Zlin because combines realistic good looks fine aerobatic performance What could modeler ask Trans America Riches continued page 24 necessary know would no flying Wednesday made two Wed nesdays row After awards presentation motel Meridian team first 3 minutes ahead number 2 Montgomery team officials off Jackson MS start next leg high winds bothering Riches pick up worse Saggin Wagon AMA motorhome Bob Roach drove bad left rear spring causing perpetual lean hence Saggin Wagon weather clearing Jackson reports pretty good next morning didnt help Jimmy Grier tonight Three team members airplanes still Chicago Jerry Nelson have Jackson already planes Hurricane Frederick delayed slightly would early next morning Doc Edwards Jimmy takeoff area early rest Team 3 BTHOOM Team wasnt Jimmys Cessna somewhere between Chicago Jackson didnt look good though up until around 2 am fixing Docs truck pilot vehicle borrowed lead vehicle didnt look BTHOOM team going make alone ask what BTHOOM team Jimmy Grier asked what name team replied after slight delay Beats Hell Out other four teams off away frontage road takeoff area still no planes Jimmys team no rest team did arrive frantic rush get ready air being taped TV crew arrived late teams ran close part leg passing other pit stops teams good times team work payed off though three planes crashed Everyone ready takeoff West Monroe LA mayor hand see planes off police help teams get through traffic lights onto freeway fire department added nice touch hot coffee everyone Bob Roach much happier now wife Sue joined him Jackson would take care selling chances Pitts Special souvenirs rest trip As usual days flights uneventful Murphys Law again teams close coming Sharks field Bossier City LA Shreveport club big recep tion barbecue ready police escort freeway field big help did cause some confusion Doc Edwards trying get lead vehicle ahead guide Team 3s pilot vehicle landing area police car raced past going other direction siren wailing lights flashing police car made abrupt U-turn Doc jammed brakes let pass As Doc watching pull alongside thought bought sure policeman leaned Out window big sweeping motion arm yelled Cmon lets make Doc told Doris little later lucky have coronary Team 5 Sharks Club team fittingly received champagne first team top honors leg Shreveport John Embry AMA VP District VIII Ba Kinch Lake Charles club joined race CDs volunteered fill last minute vacancies leg Bo continue Abilene TX help out flight Shreveport Dallas long makes pit stops possible trouble Out five started Kellys Truck Stop morning four made no normal number problems broken props bent landing gears deadstick landings lost hatches crash two addition morning briefings Dont wear race hats back pilot vehicles tying Because no going lose valuable time retrieving race route well marked lost blue-and-white hats flight Mesquite Model Field Ft Worth uneventful five planes made short flight about 50 miles good time high point takeoff Mesquite reading proclamation mayor Dallas AMA past president Johnny Clemens along mayor pro tem Mesquite gave planes good send off landing Tarrant County Junior College landing area Fort Worth Jim Simpsons Southwest Modelers RC Club team least number problems took first place hardware three half minutes ahead John Kikers NASA Flyers Houston takeoff Ft Worth Wednesday 106 Model Aviation