Radio Control: Scale

where obscure prototype much older color photography Models two WW aircraft existed sole protoypes photos Ive provided month Dufaux first flew early 1916 very simple conventional two-place single-bay biplaneexcept bizarre fea tare engine located behind crew propeller behind wings trailing edges fixed hollow tube upon prop rotated supported aft fuselage tail sembly pilot gunner single swivel ing Lewis gun sat side-by-side nose model 4-scale yields span about 52 wing area 830 sq model lightly built effort approximate Author Tschirgis 1917 Brandenburg W-18 exemplifies type out-of-the-rut Scale model often encourages Scale judges give extra few points static score lie-scale spans 70 weighs 7 lb uses Supertigre 60 power Light weight lots wing area let fly scalelike slow speeds flew contests off grass paved sur faces using takeoff doily foam-rubber skids bottom Scene Lake Elsinore CA STRANGE AIRCRAFT known emerge workshop Model Aviations publisher called asked would write short piece RC Scale models mentioned own building strange models However prefer say build models strange aircraft agreed write about expe riences some course also con sider license expose favorite prejudices other misconceptions Ive always favored WW I-era prototypes simple reason simple Also poor flying evident official flight can complain judges should expect light aircraft perfect figures scale hurricane ploy seldom works fascinating diversity available configura tions monoplanes biplanes triplanes quadra planes landplanes floatplanes flying boats amphibians about twin-engined quadraplane biplane tail Supermarine PB3lE also very simple configura tions select example besides DVIIIIEV Fokker produced least seven dis tinctly different single-engine cantilever mono plane fighter prototypes during WW Alba tross tested interesting strut-braced wireless bi planes DXI Theres unique satisfaction producing Scale model experienced modelers can identify little research its easy find Another Tschirgis strange aircraft models 1916 Dufaux France Note prop behind wings protrudes through fuselage Propulsion system package homemade ingenious uses geared RC car gears Cox TeeDee 09 pusher prop laminated balsa forced-draft cooling squirrel-cage blower built prop hub Flight photo taken two seconds before total destruction overtook Joe admits pilot error Crash came after fine flights though Theres info features column 42 Model Aviation Radio Cono Scale Joe Tschirgi 1841 Whltestone Santa Am CA 92705 such aircraft WW period compe tition standpoint procedure outlined both AMA FM rule books getting selfdrawn three-views approved use doc umentation Also Scale judges will allow educated guesswork color markings scale speed its gross weight 3A lb Light weight also simplifies propulsion system design since small engine can used models propulsion system shown photos Cox TeeDee 09 OS 09 carburetor has small flywheel small steel pinion gear attached prop usually goes pinion drives large nylon gear ratio 51 screwed propeller pro peller rotates shaft thin-walled stainless steel tubing short length cut auto radio antenna extends through prop sup ports aft fuselage Two 032-in cables ny lon tubes extend through shaft operate rudder elevator flight propeller scale 17-in diameter 12-in pitch carved laminated balsawood covered silk two ball bearings its hub Sharp-eyed sen ior citizens may note old Jim Walker fuel pressure regulator engines fuel line Cooling engine obvious problem such totally enclosed engine photo doesnt show clearly squirrel-cage blower incorporated prop hub uses vanes made thin plastic Air sucked through cockpit blower di rects through i-in hole firewall hole directly front Coxs cylinder fuselage end-closure made / ply wood placed between engine pro peller increases effectiveness blower entire propulsion package photo weighs 10 oz normal tractor engine installations Ive used inverse cooling scheme Dynamic alr pressure model ffight drives air through cowling firewall hole di rectly behind cylinder Out through open cockpit either case important shroud air path between engine cylinder firewall Air passing away engine will cool cringe time see engine installed cowl directly front firewall alr exit inches cylinder can hope planes builder uses lot castor oil fuel mix because thats cooling agent available poor engine worth noting type gear system can used allow scale-diameter props con ventional models little thought can make sort hardware machinists tools gears ball bearings flywheel Dufaux hobby shop items RC car modelers normal hand tools used produce propulsion system package try remember gears will try pry themselves apart theyre under load Thus practical way producing set Continued page 143 October 1988 43 strange models Scale All-foam board flat-airfolled craft did vertical takeoffs Supertigre 60 power 58 span sym wing Fantasy 40Area 640 sq inCRENSHAWAERO Fully35-802cy.604cy423W Washington Aerobatic4-4t5 lbs4channel Shelbyville IN 46176 317-398-6528 M ll 400 pm STl Fun Bipe $4995 plus *5 P5- H Kits Feature Machine cut ft sanded parts rolled plans hardware pie-bent landing gear check Money Order US Funds5ASE Information Wingspan 48 inches Area 840 sq 30-402cy 454cy 45 5 lbs $4995 plus 85 P5-H thats Im offering Next bought K&B Model 5900 Sportster 45 its matching muffler put engine its firewall mount made some measurements various fuels props intake silencers aftermufflers breaking K&B muffler excellent experimented rubber mount made 3-in-diameter spongerubber wheel Summasy results Table 1 Don Lowe right biggest improvements come reducing rpm isolating engine airframe Finally put engine Lanier Javelin has blow-molded plastic-and-plywood fuse lage flew made some measure ments Overall can say K&B Sportster 45 handled nicely quietly reliably K&B fashion rubber mount made plane quieter case solid wood mount agrees Don Lowes find ings really should put effort isolat ing engine mounts Solder/Schoenberg-Shutes Continued page 40 previous freehand soldering jobs modelers may want try out such tool kit materials instruc dons available $650 postpaid RC Wiring Tool 858 NE Quimby Aye Bend Oregon 97701 RC Scale/Tschirgi Continued page 43 lightweight bracketiy include tension member between engine crankshaft bearing housing big main gear shaft can see photo Its also impossible make mounting faces brackets coplanar using simple tools Without resort some trickery whole assembly will warped tighten mounting screws trick coat bracket faces paraffin area contact firewall thick mixture epoxy microballoons firewall horizontal keep epoxy/microhaboon mixture run ning lightly bolt propulsion systems brack ets firewall paraffin keeps epoxy adhering bracket faces Dufaux flew quite well defi nitely overpowered would ROG grass strip flight phato model taken during its last flightabout two sec onds destruction flying photog rapher doing tight turn right al titude about 15 ft model snap rolled over top ie left Look closely will see models aileron rud der positions hard-over right Mark up pilot error moral Any Scale model wing washout likely grow old gracefully Another two photos 1917-vintage Bran denburg W-18 seaplane fighter designed Ernst Heinkel gained greater fame WW II Again model /6-scale has wingspan 70 An inverted old-style Supertigre ST60 pushed its 7 lb along almost sprightly style lots washout lower wings allowed mild acrobatics model worth discussing since did well Scale meets number years events flown off landed grass paved runways Two factors primary contributors success First example outstanding craftsmanship real craftsmanship doesnt count too much judge 15 ft model What judge could see interesting out-of-the-rut configuration gaudy colors markings Scale judges will score model unusual aircraft little higher Perhaps originality factor because some like myself regret old own-design bonus dropped static scoring AMA some years ago Addition ally judges presented models same aircraft type has plain-Jane finish gaudy ones will get significantly higher pointseven difference easily ap Continued page 146 October 1988 143 Table 1 Firewall-mounted K&B Sportster 45 its muffler A-scale slow Radio Shack sound-level meter located 9 ft out 1 ft up source over packed sand HardIsolated PropRPM MountMount 9x6 TF13500 97dB92dB Spr M 10x6 12000 94dB88dB 1991 Guidelines certification first equipment has certified meet narrow-band requirements AMA 1991 Guidelines listed AM4 News section month Elm SUNSHINE HOBBY READY TO FLY Call 1-800-45-TO FLY ACCESSORIES INCLUDED PIPER CHEROKEE-40$12999 PIPER CHEROKEE-2510899 FOKKER E111-4011999 FANCY STICK-4011499 FANCY STICK-256999 CESSNA 172-2010899 CONDOR-40L11999 TERCEL-4512199 ENGINE NOT INCLUDED PIONEER CAR$6000 ENGINE INCLUDED 17221 South Western Avenue Gardens California 90247 CONTACT US FOR THIS MONTHS SPECIAL RC Scale/Tschirgi Continued page 143 plied transfers plain finish true scale particular aircraft Yes decal factor real second place W-18 easy fly primarily due its light weight lengthy effort improve control characteristics Light weight also contributes flight realism score almost impossible accurately simulate landing speed 4-scale model WW aircraft would have weigh less 1/1000 full scale about two lb case W-18 Fortunately box fuselage found early aircraft inherently light problem W-18 cabane engine mount wings Cabane struts fabricated A-in brass tube faired balsa attached -in maple box-frame-type engine mount total weight cabane struts box frame 9 oz less weight landing gear typical A-scale model A-in brass tube half weight %2 piano wire has good resistance vibration environment easier work case also used house electrical leads aileron servo located upper wing Wing structure used lightweight built-up ribs employed fabrication scheme similar sliced-rib method makes easy qulck produce Upper lower rib cap strips shaped form bent sheet aluminum After soaking A-in-sq balsa strips water dozens strips clamped form baked oven about 3250 F PRODUCTS FOR flAW naereaflufl annt CC Complete Line Exhaust Systems Tuned Pipes led Tuned Pipes Headers uri Mufflers Expansion Mufflers Helicopter Ball Mufflers ialized Exhaust Systems Unsurpassed Workmanship fr Performance Spars full-depth between caps built up I-section purposes weight re duction assemble bottom rib caps laid tween leading trailing edges spars glued bottom caps top caps added Upright members between rib caps inserted used three uprights per rib two between spars aft rear spar Mark locations caps before beginning assembly Uprights can quickly massproduced cutting cross-grained strips proper height A-in sheet slicing off dividual pieces land model flown fuur wheeled dolly similar used Control Line Speed models land touchdowns bot tom hull fuselage protected A-in thick strips foam rubber weather stripping small music wire skids tip floats flight add-ons legal both AMA FM competitions flight judges generally amused vely quick stop produced skids Flight characteristics originally prob lem because pitch yaw trim changes ac companying various power settings glide trim straight level power produced diving left turn cause nose-down trim change obvious high thrust line left turn came surprise since torque reaction pusher engine tends produce right bank little-known facts modeldom effects produced thrust line adjustments primarily due propwash tailnot dis placement thrust line CG left turn propwash effect propwash swirls direction prop rotation fin rudder area W-18 beCOMPOSITE MATERIALS CARBON FIBER LAMINATES CARBON & KEYLAR MATS KEVLAR / GRAPHITE FABRICS 58 ozi sq ft GLASS CLOTh CARBON & KEVLAR TAPES CARSON FIBER RIBBON GLASS FOAM PANELS GLASS END GRAIN BALSA PANELS CARBON FIBER END GRAIN BALSA PANELS BRAIDED CARBON CXR2 074 CARBON FIBER FLEX PLATES SAFETPOXY Eposy Lanilngkg ResIn Send SASE foi complete listing products Aerospace Composite Products PO Bos 16621 IrvIne CA 4 714 250-1107 low thrust line Thus normal-rotation push er engine produces left turn Because propwash thrust correction condition downthrust moves thrust line further above CG right thrust moves thrust line right CG Note both adjustments produce wrong effect thrust line displacement relative CG considered trim changes greatly reduced manner practical considerations physical interference prevented full correction final cure included throttie/rudder throttle/eleva tor mixing done mechanically compound belicranks Theoretically control mixing does work well such trim corrections because both thrust propwash velocity vary airspeed fixed throttle setting variation small model such W-18 once knew fine old gentleman Early Bird ie pilot before WW wbo flew Loening biplane am phibian around Bahamas early Forties Captain claimed Loening high speed 80 mph cruised 80 mph glided 80 mph landed 85 mph Similarly power variations W-18 model priniar ily used produce climb glide rather change speed either competition just plain fun pro ducing models unique different weird air craft rewarding Any manned aircraft has flown computer-augmented con trol system can successfully modeled flown todays RC equipment key al ways light weight Dont let fear flying light model breeze deter Proof pilots average abil 146 Model Aviation WINGS SCRATCH BUILDERS I! PRECISION CUT FOAM WING CORES WIDE VARIETY OF WING SPANS TAPERS AND SECTIONS TO CHOOSE FROM SEND $200 FOR BROCHURE FLIGHT COMPONENTS POBOX 39366 ST LOUIS MO 63139-8366 WE ARE SHOOTING DOWN HIGH BALSA PRICES WITH SUPER QUALITTI Satisfaction Guaranteed Direct Only ALSA SHEETS 364530l 1/16233 3132 240 1/8 243 3/18249 1/4 258 1/32337 1/20337 116 3374931 3/32 3445837 18 c3547148 3/163828255 1/4 3739561 5/163 85 110 3/8 c3 88 124 71 1/2 c3 110 155 3/4 3 165 191 1/164 58 76 48 3/32 4 70 94 56 1/8 4 80 108 68 3/164 93 122 75 1/4 4 110 124 84 3/8 4 165 225 139 /2 4 225 281 MATCHED SHEETS 42 3/324100 /84108 3/184120 1/44131 SALU STICKS 3645 1/161/409 1/163/810 1/161/214 3/321/410 3/323/812 3/321/216 1/81/808 1/81/41116 1/83/81218 1/81/21024 3/163/161116 3/163/81720 3/161/22230 141/41624 1/43161926 1/41/22130 1/43/43444 1/414055 5/165/162128 3/83/92737 3/81/23246 3/83/44255 3/815270 1/21/23653 1/2344662 1/215878 5/85/84865 3/43/46790 BALSA HOT LINE Call 806 745-6394 10am -6pm Central Time LONE STAR MODELS 1623 57th St Lubbock IX 79412 CUSTOM CUT CONTEST BALSA Sheets Piece ed Close Tolerances AAA Grade Dried ped 100% serious modeler want performance LIGHT 4-5 LB 1/32349 1/20349 1/16349 3/32358 1/8367 3/16376 1/4385 3/83115 1/23139 3/43220 13300 1/16478 3/32491 1/84100 3/164117 1/44139 3/84207 282 BALSA TRIANGLES 36 4425 383830 2235 343445 55 SALSA PLANKS 36 88 250 3200 4280 11/23275 11/24360 22225 23325 24435 33495 346881/24 TAPERED SHEETS36 1/4265TRAIL NdG EDGE36 1/43851/4132 3/82885/1611/439 3/83983/81 1/246 1/231201/2270 IHSTANT GLUE 1 oc Thick 258 1 , 15/ 298 2cr Thick 558 2, Thn 558 / LONE STAR EPOXY 9, Lol--800 Socic598 15 no, 598 30oi598 must try 4-6 lb balsa * NEW * Hundreds new sizes accessories finishing materials Send #10 SASE latest catalog SPRUCE STICKS 36 46 1/8 1/91522 1/8 1/41824 1/8 3/82039 3/163/162534 1/4 1/43145 1/4 3/83650 1/401/24565 3/8 3/84583 3/81/25570 1/21/26080 1/23/48888 SPRUCE TRIANGLES 3/8 3/8 1/21/2 3/4 3/4 LITE PLY 48 1/8 6 1/812 1/412 SASS WOOD48 3/163/1626 3/161/430 3/163/839 3/161/246 3/163/460 1/41/442 1/43/849 1/43/488 3/8 3/855 3/81/270 3/83/490 1/21/290 1/23/4100 SUHDLE DEALS 20-1/16338885 201/164361020 203/32336840 153/32436955 151/8336715 101/8436675 153/16336500 103/16436810 101/4339630 101/4436890 103/8336858 53/8436625 54/3336540 51/24361050 103/32448845 51/8448488 53/16448585 51/4448839 HARD MAPLE 1/43/8 3/8 3/8 3/81/2 3/83/4 1/23/4 WRCH DOWELS36 1/800 3/1611 1/414 5/1625 3/832 3PLYSIRCH48 1/6412830 1/3212445 1/1612455 1/812450 SPLYDINCH48 3/3212598 1/812625 363/1812639 451/412825 613/812725 771/212900 / GROOVED LG MOUNTS i2lachaa 1903/83/41/8/40 3003/83/45/32/40 4751/23/43/1645 ConS 48 Handling Charge pay UPS Add $250 COD $300 extra PP APO FPO State accept Visa Master C8rd personal check, COO 855% Ia Teas US crrency ooIy Mgimam Wood Order $1000 ity can fly models wing loadings 8 oz per sq ft winds exceeding models nummum airspeed can found Slope Soaring site Lets get out WW II fighter rut RC Soaring/Blakeslee Continued page 45 out 14-ft-span 35-lb Northrop flying wing YB-49 crowd anxiously assem bled watch launch pilot Ken Stuhr wing men Jim Rauch Rick Edris Bill Vukoinch first fly unsuccessful because stall minor crash Repairs completed preparations made another launch asking Will thing really fly second attempt charmed flight something experienced YB-49 sounded realistic whooshed past ultimate thrill climax wonderful weekend Wed like think Scale Slope FunFly special event craftsmen pilots sportsmen hope will better 89 based thoughtful evaluations re ceived So begin planning Memorial Day weekend May 25-28 1989 model must scale replica full-size glider Glider replicates full-size powered ship Beyond AMA Safety Code applies rest just flying fun attempting make interna tional event hope will attract partici pants Europe elsewhere hope manufacturers trade show will combined Friday night social will able examine purchase next Scale project Please plan attend 89 Remember fun need come show off Scale Glider Finally thanks club members worked hard make such successWil Byers video Slope Scale Fun-Fly available Mark Foster Videos filmed much action Wil described above offering onehour VHS tape $25 postage handling tax included tape has lot good flying shots unfortunately YB-49 flying wing could something wrong player tape watched several spots scenery tinted red can buy tape sending check money order Mark 826 Oneonta Dr So Pasadena CA 91030 now word about Walt Goods Gutsy Lady Anyone attended 87 Nats Lin coln NE will tell last two days flying much fun because winds gusting tween 20 30 mph About third contes tants decided discretion better part va lor dropped out Another third flew did bad things planes Through Walt Good flew serenely Goldberg Gentle Lady Gentle Lady Yes thats what Docs plane looked like fig ured met eye Wait allowed Lady beefed-up wing didnt have time discuss matter fully So saw write-up plane Bob Nelson Bobs Florida Soaring Society newslet ter knew something passed Bobs description some time Doc has flying Gentle Lady reasonable success 1987 no longer remained reasonable captured first place Tangerine Two-Meter after sea son successes culminated second-place finish FSSs contest season 1988 story continuea. first two thirds three FSS Two-Meter contests mention threat becoming Unlimited class Docs Gentle Lady drew editors atten tion 1987 Tangerine launched such acceleration broke winch line dive down relaunch another winch breathtaking often see stock Gentle Lady conversation Doc revealed experimenting new wing asked him article might reveal some inter esting points about its development did send generalized account rather full-size ribs spar construction detailsthe works made quite clear anyone welcome dupli cate wing door open boys Everyone has GL knows someone does Turn page find out fill Florida skies Gutsy Ladies turning page finds marked-up photo spar leading trailing edge con struction sketches airfoil wing planform notes Walt building flying Gutsy Lady Walts notes 1 Build new wing top GL plans cen ter section flat Tips have 13 dihedral plug center section using %-in-dia steel rod brass tubing Airfoil Selig 4061-096-84 Top bottom sheeted 6 balsa LE back spar Rear part ribs cap stripped top bottom No washout usedflew well apparently needed No taper LE TE ribs same size 2 Center spar 0007 x 1A-in carbon fiber beContinued page 151 October 1988 147 16 40 45 50 58 88

where obscure prototype much older color photography Models two WW aircraft existed sole protoypes photos Ive provided month Dufaux first flew early 1916 very simple conventional two-place single-bay biplaneexcept bizarre fea tare engine located behind crew propeller behind wings trailing edges fixed hollow tube upon prop rotated supported aft fuselage tail sembly pilot gunner single swivel ing Lewis gun sat side-by-side nose model 4-scale yields span about 52 wing area 830 sq model lightly built effort approximate Author Tschirgis 1917 Brandenburg W-18 exemplifies type out-of-the-rut Scale model often encourages Scale judges give extra few points static score lie-scale spans 70 weighs 7 lb uses Supertigre 60 power Light weight lots wing area let fly scalelike slow speeds flew contests off grass paved sur faces using takeoff doily foam-rubber skids bottom Scene Lake Elsinore CA STRANGE AIRCRAFT known emerge workshop Model Aviations publisher called asked would write short piece RC Scale models mentioned own building strange models However prefer say build models strange aircraft agreed write about expe riences some course also con sider license expose favorite prejudices other misconceptions Ive always favored WW I-era prototypes simple reason simple Also poor flying evident official flight can complain judges should expect light aircraft perfect figures scale hurricane ploy seldom works fascinating diversity available configura tions monoplanes biplanes triplanes quadra planes landplanes floatplanes flying boats amphibians about twin-engined quadraplane biplane tail Supermarine PB3lE also very simple configura tions select example besides DVIIIIEV Fokker produced least seven dis tinctly different single-engine cantilever mono plane fighter prototypes during WW Alba tross tested interesting strut-braced wireless bi planes DXI Theres unique satisfaction producing Scale model experienced modelers can identify little research its easy find Another Tschirgis strange aircraft models 1916 Dufaux France Note prop behind wings protrudes through fuselage Propulsion system package homemade ingenious uses geared RC car gears Cox TeeDee 09 pusher prop laminated balsa forced-draft cooling squirrel-cage blower built prop hub Flight photo taken two seconds before total destruction overtook Joe admits pilot error Crash came after fine flights though Theres info features column 42 Model Aviation Radio Cono Scale Joe Tschirgi 1841 Whltestone Santa Am CA 92705 such aircraft WW period compe tition standpoint procedure outlined both AMA FM rule books getting selfdrawn three-views approved use doc umentation Also Scale judges will allow educated guesswork color markings scale speed its gross weight 3A lb Light weight also simplifies propulsion system design since small engine can used models propulsion system shown photos Cox TeeDee 09 OS 09 carburetor has small flywheel small steel pinion gear attached prop usually goes pinion drives large nylon gear ratio 51 screwed propeller pro peller rotates shaft thin-walled stainless steel tubing short length cut auto radio antenna extends through prop sup ports aft fuselage Two 032-in cables ny lon tubes extend through shaft operate rudder elevator flight propeller scale 17-in diameter 12-in pitch carved laminated balsawood covered silk two ball bearings its hub Sharp-eyed sen ior citizens may note old Jim Walker fuel pressure regulator engines fuel line Cooling engine obvious problem such totally enclosed engine photo doesnt show clearly squirrel-cage blower incorporated prop hub uses vanes made thin plastic Air sucked through cockpit blower di rects through i-in hole firewall hole directly front Coxs cylinder fuselage end-closure made / ply wood placed between engine pro peller increases effectiveness blower entire propulsion package photo weighs 10 oz normal tractor engine installations Ive used inverse cooling scheme Dynamic alr pressure model ffight drives air through cowling firewall hole di rectly behind cylinder Out through open cockpit either case important shroud air path between engine cylinder firewall Air passing away engine will cool cringe time see engine installed cowl directly front firewall alr exit inches cylinder can hope planes builder uses lot castor oil fuel mix because thats cooling agent available poor engine worth noting type gear system can used allow scale-diameter props con ventional models little thought can make sort hardware machinists tools gears ball bearings flywheel Dufaux hobby shop items RC car modelers normal hand tools used produce propulsion system package try remember gears will try pry themselves apart theyre under load Thus practical way producing set Continued page 143 October 1988 43 strange models Scale All-foam board flat-airfolled craft did vertical takeoffs Supertigre 60 power 58 span sym wing Fantasy 40Area 640 sq inCRENSHAWAERO Fully35-802cy.604cy423W Washington Aerobatic4-4t5 lbs4channel Shelbyville IN 46176 317-398-6528 M ll 400 pm STl Fun Bipe $4995 plus *5 P5- H Kits Feature Machine cut ft sanded parts rolled plans hardware pie-bent landing gear check Money Order US Funds5ASE Information Wingspan 48 inches Area 840 sq 30-402cy 454cy 45 5 lbs $4995 plus 85 P5-H thats Im offering Next bought K&B Model 5900 Sportster 45 its matching muffler put engine its firewall mount made some measurements various fuels props intake silencers aftermufflers breaking K&B muffler excellent experimented rubber mount made 3-in-diameter spongerubber wheel Summasy results Table 1 Don Lowe right biggest improvements come reducing rpm isolating engine airframe Finally put engine Lanier Javelin has blow-molded plastic-and-plywood fuse lage flew made some measure ments Overall can say K&B Sportster 45 handled nicely quietly reliably K&B fashion rubber mount made plane quieter case solid wood mount agrees Don Lowes find ings really should put effort isolat ing engine mounts Solder/Schoenberg-Shutes Continued page 40 previous freehand soldering jobs modelers may want try out such tool kit materials instruc dons available $650 postpaid RC Wiring Tool 858 NE Quimby Aye Bend Oregon 97701 RC Scale/Tschirgi Continued page 43 lightweight bracketiy include tension member between engine crankshaft bearing housing big main gear shaft can see photo Its also impossible make mounting faces brackets coplanar using simple tools Without resort some trickery whole assembly will warped tighten mounting screws trick coat bracket faces paraffin area contact firewall thick mixture epoxy microballoons firewall horizontal keep epoxy/microhaboon mixture run ning lightly bolt propulsion systems brack ets firewall paraffin keeps epoxy adhering bracket faces Dufaux flew quite well defi nitely overpowered would ROG grass strip flight phato model taken during its last flightabout two sec onds destruction flying photog rapher doing tight turn right al titude about 15 ft model snap rolled over top ie left Look closely will see models aileron rud der positions hard-over right Mark up pilot error moral Any Scale model wing washout likely grow old gracefully Another two photos 1917-vintage Bran denburg W-18 seaplane fighter designed Ernst Heinkel gained greater fame WW II Again model /6-scale has wingspan 70 An inverted old-style Supertigre ST60 pushed its 7 lb along almost sprightly style lots washout lower wings allowed mild acrobatics model worth discussing since did well Scale meets number years events flown off landed grass paved runways Two factors primary contributors success First example outstanding craftsmanship real craftsmanship doesnt count too much judge 15 ft model What judge could see interesting out-of-the-rut configuration gaudy colors markings Scale judges will score model unusual aircraft little higher Perhaps originality factor because some like myself regret old own-design bonus dropped static scoring AMA some years ago Addition ally judges presented models same aircraft type has plain-Jane finish gaudy ones will get significantly higher pointseven difference easily ap Continued page 146 October 1988 143 Table 1 Firewall-mounted K&B Sportster 45 its muffler A-scale slow Radio Shack sound-level meter located 9 ft out 1 ft up source over packed sand HardIsolated PropRPM MountMount 9x6 TF13500 97dB92dB Spr M 10x6 12000 94dB88dB 1991 Guidelines certification first equipment has certified meet narrow-band requirements AMA 1991 Guidelines listed AM4 News section month Elm SUNSHINE HOBBY READY TO FLY Call 1-800-45-TO FLY ACCESSORIES INCLUDED PIPER CHEROKEE-40$12999 PIPER CHEROKEE-2510899 FOKKER E111-4011999 FANCY STICK-4011499 FANCY STICK-256999 CESSNA 172-2010899 CONDOR-40L11999 TERCEL-4512199 ENGINE NOT INCLUDED PIONEER CAR$6000 ENGINE INCLUDED 17221 South Western Avenue Gardens California 90247 CONTACT US FOR THIS MONTHS SPECIAL RC Scale/Tschirgi Continued page 143 plied transfers plain finish true scale particular aircraft Yes decal factor real second place W-18 easy fly primarily due its light weight lengthy effort improve control characteristics Light weight also contributes flight realism score almost impossible accurately simulate landing speed 4-scale model WW aircraft would have weigh less 1/1000 full scale about two lb case W-18 Fortunately box fuselage found early aircraft inherently light problem W-18 cabane engine mount wings Cabane struts fabricated A-in brass tube faired balsa attached -in maple box-frame-type engine mount total weight cabane struts box frame 9 oz less weight landing gear typical A-scale model A-in brass tube half weight %2 piano wire has good resistance vibration environment easier work case also used house electrical leads aileron servo located upper wing Wing structure used lightweight built-up ribs employed fabrication scheme similar sliced-rib method makes easy qulck produce Upper lower rib cap strips shaped form bent sheet aluminum After soaking A-in-sq balsa strips water dozens strips clamped form baked oven about 3250 F PRODUCTS FOR flAW naereaflufl annt CC Complete Line Exhaust Systems Tuned Pipes led Tuned Pipes Headers uri Mufflers Expansion Mufflers Helicopter Ball Mufflers ialized Exhaust Systems Unsurpassed Workmanship fr Performance Spars full-depth between caps built up I-section purposes weight re duction assemble bottom rib caps laid tween leading trailing edges spars glued bottom caps top caps added Upright members between rib caps inserted used three uprights per rib two between spars aft rear spar Mark locations caps before beginning assembly Uprights can quickly massproduced cutting cross-grained strips proper height A-in sheet slicing off dividual pieces land model flown fuur wheeled dolly similar used Control Line Speed models land touchdowns bot tom hull fuselage protected A-in thick strips foam rubber weather stripping small music wire skids tip floats flight add-ons legal both AMA FM competitions flight judges generally amused vely quick stop produced skids Flight characteristics originally prob lem because pitch yaw trim changes ac companying various power settings glide trim straight level power produced diving left turn cause nose-down trim change obvious high thrust line left turn came surprise since torque reaction pusher engine tends produce right bank little-known facts modeldom effects produced thrust line adjustments primarily due propwash tailnot dis placement thrust line CG left turn propwash effect propwash swirls direction prop rotation fin rudder area W-18 beCOMPOSITE MATERIALS CARBON FIBER LAMINATES CARBON & KEYLAR MATS KEVLAR / GRAPHITE FABRICS 58 ozi sq ft GLASS CLOTh CARBON & KEVLAR TAPES CARSON FIBER RIBBON GLASS FOAM PANELS GLASS END GRAIN BALSA PANELS CARBON FIBER END GRAIN BALSA PANELS BRAIDED CARBON CXR2 074 CARBON FIBER FLEX PLATES SAFETPOXY Eposy Lanilngkg ResIn Send SASE foi complete listing products Aerospace Composite Products PO Bos 16621 IrvIne CA 4 714 250-1107 low thrust line Thus normal-rotation push er engine produces left turn Because propwash thrust correction condition downthrust moves thrust line further above CG right thrust moves thrust line right CG Note both adjustments produce wrong effect thrust line displacement relative CG considered trim changes greatly reduced manner practical considerations physical interference prevented full correction final cure included throttie/rudder throttle/eleva tor mixing done mechanically compound belicranks Theoretically control mixing does work well such trim corrections because both thrust propwash velocity vary airspeed fixed throttle setting variation small model such W-18 once knew fine old gentleman Early Bird ie pilot before WW wbo flew Loening biplane am phibian around Bahamas early Forties Captain claimed Loening high speed 80 mph cruised 80 mph glided 80 mph landed 85 mph Similarly power variations W-18 model priniar ily used produce climb glide rather change speed either competition just plain fun pro ducing models unique different weird air craft rewarding Any manned aircraft has flown computer-augmented con trol system can successfully modeled flown todays RC equipment key al ways light weight Dont let fear flying light model breeze deter Proof pilots average abil 146 Model Aviation WINGS SCRATCH BUILDERS I! PRECISION CUT FOAM WING CORES WIDE VARIETY OF WING SPANS TAPERS AND SECTIONS TO CHOOSE FROM SEND $200 FOR BROCHURE FLIGHT COMPONENTS POBOX 39366 ST LOUIS MO 63139-8366 WE ARE SHOOTING DOWN HIGH BALSA PRICES WITH SUPER QUALITTI Satisfaction Guaranteed Direct Only ALSA SHEETS 364530l 1/16233 3132 240 1/8 243 3/18249 1/4 258 1/32337 1/20337 116 3374931 3/32 3445837 18 c3547148 3/163828255 1/4 3739561 5/163 85 110 3/8 c3 88 124 71 1/2 c3 110 155 3/4 3 165 191 1/164 58 76 48 3/32 4 70 94 56 1/8 4 80 108 68 3/164 93 122 75 1/4 4 110 124 84 3/8 4 165 225 139 /2 4 225 281 MATCHED SHEETS 42 3/324100 /84108 3/184120 1/44131 SALU STICKS 3645 1/161/409 1/163/810 1/161/214 3/321/410 3/323/812 3/321/216 1/81/808 1/81/41116 1/83/81218 1/81/21024 3/163/161116 3/163/81720 3/161/22230 141/41624 1/43161926 1/41/22130 1/43/43444 1/414055 5/165/162128 3/83/92737 3/81/23246 3/83/44255 3/815270 1/21/23653 1/2344662 1/215878 5/85/84865 3/43/46790 BALSA HOT LINE Call 806 745-6394 10am -6pm Central Time LONE STAR MODELS 1623 57th St Lubbock IX 79412 CUSTOM CUT CONTEST BALSA Sheets Piece ed Close Tolerances AAA Grade Dried ped 100% serious modeler want performance LIGHT 4-5 LB 1/32349 1/20349 1/16349 3/32358 1/8367 3/16376 1/4385 3/83115 1/23139 3/43220 13300 1/16478 3/32491 1/84100 3/164117 1/44139 3/84207 282 BALSA TRIANGLES 36 4425 383830 2235 343445 55 SALSA PLANKS 36 88 250 3200 4280 11/23275 11/24360 22225 23325 24435 33495 346881/24 TAPERED SHEETS36 1/4265TRAIL NdG EDGE36 1/43851/4132 3/82885/1611/439 3/83983/81 1/246 1/231201/2270 IHSTANT GLUE 1 oc Thick 258 1 , 15/ 298 2cr Thick 558 2, Thn 558 / LONE STAR EPOXY 9, Lol--800 Socic598 15 no, 598 30oi598 must try 4-6 lb balsa * NEW * Hundreds new sizes accessories finishing materials Send #10 SASE latest catalog SPRUCE STICKS 36 46 1/8 1/91522 1/8 1/41824 1/8 3/82039 3/163/162534 1/4 1/43145 1/4 3/83650 1/401/24565 3/8 3/84583 3/81/25570 1/21/26080 1/23/48888 SPRUCE TRIANGLES 3/8 3/8 1/21/2 3/4 3/4 LITE PLY 48 1/8 6 1/812 1/412 SASS WOOD48 3/163/1626 3/161/430 3/163/839 3/161/246 3/163/460 1/41/442 1/43/849 1/43/488 3/8 3/855 3/81/270 3/83/490 1/21/290 1/23/4100 SUHDLE DEALS 20-1/16338885 201/164361020 203/32336840 153/32436955 151/8336715 101/8436675 153/16336500 103/16436810 101/4339630 101/4436890 103/8336858 53/8436625 54/3336540 51/24361050 103/32448845 51/8448488 53/16448585 51/4448839 HARD MAPLE 1/43/8 3/8 3/8 3/81/2 3/83/4 1/23/4 WRCH DOWELS36 1/800 3/1611 1/414 5/1625 3/832 3PLYSIRCH48 1/6412830 1/3212445 1/1612455 1/812450 SPLYDINCH48 3/3212598 1/812625 363/1812639 451/412825 613/812725 771/212900 / GROOVED LG MOUNTS i2lachaa 1903/83/41/8/40 3003/83/45/32/40 4751/23/43/1645 ConS 48 Handling Charge pay UPS Add $250 COD $300 extra PP APO FPO State accept Visa Master C8rd personal check, COO 855% Ia Teas US crrency ooIy Mgimam Wood Order $1000 ity can fly models wing loadings 8 oz per sq ft winds exceeding models nummum airspeed can found Slope Soaring site Lets get out WW II fighter rut RC Soaring/Blakeslee Continued page 45 out 14-ft-span 35-lb Northrop flying wing YB-49 crowd anxiously assem bled watch launch pilot Ken Stuhr wing men Jim Rauch Rick Edris Bill Vukoinch first fly unsuccessful because stall minor crash Repairs completed preparations made another launch asking Will thing really fly second attempt charmed flight something experienced YB-49 sounded realistic whooshed past ultimate thrill climax wonderful weekend Wed like think Scale Slope FunFly special event craftsmen pilots sportsmen hope will better 89 based thoughtful evaluations re ceived So begin planning Memorial Day weekend May 25-28 1989 model must scale replica full-size glider Glider replicates full-size powered ship Beyond AMA Safety Code applies rest just flying fun attempting make interna tional event hope will attract partici pants Europe elsewhere hope manufacturers trade show will combined Friday night social will able examine purchase next Scale project Please plan attend 89 Remember fun need come show off Scale Glider Finally thanks club members worked hard make such successWil Byers video Slope Scale Fun-Fly available Mark Foster Videos filmed much action Wil described above offering onehour VHS tape $25 postage handling tax included tape has lot good flying shots unfortunately YB-49 flying wing could something wrong player tape watched several spots scenery tinted red can buy tape sending check money order Mark 826 Oneonta Dr So Pasadena CA 91030 now word about Walt Goods Gutsy Lady Anyone attended 87 Nats Lin coln NE will tell last two days flying much fun because winds gusting tween 20 30 mph About third contes tants decided discretion better part va lor dropped out Another third flew did bad things planes Through Walt Good flew serenely Goldberg Gentle Lady Gentle Lady Yes thats what Docs plane looked like fig ured met eye Wait allowed Lady beefed-up wing didnt have time discuss matter fully So saw write-up plane Bob Nelson Bobs Florida Soaring Society newslet ter knew something passed Bobs description some time Doc has flying Gentle Lady reasonable success 1987 no longer remained reasonable captured first place Tangerine Two-Meter after sea son successes culminated second-place finish FSSs contest season 1988 story continuea. first two thirds three FSS Two-Meter contests mention threat becoming Unlimited class Docs Gentle Lady drew editors atten tion 1987 Tangerine launched such acceleration broke winch line dive down relaunch another winch breathtaking often see stock Gentle Lady conversation Doc revealed experimenting new wing asked him article might reveal some inter esting points about its development did send generalized account rather full-size ribs spar construction detailsthe works made quite clear anyone welcome dupli cate wing door open boys Everyone has GL knows someone does Turn page find out fill Florida skies Gutsy Ladies turning page finds marked-up photo spar leading trailing edge con struction sketches airfoil wing planform notes Walt building flying Gutsy Lady Walts notes 1 Build new wing top GL plans cen ter section flat Tips have 13 dihedral plug center section using %-in-dia steel rod brass tubing Airfoil Selig 4061-096-84 Top bottom sheeted 6 balsa LE back spar Rear part ribs cap stripped top bottom No washout usedflew well apparently needed No taper LE TE ribs same size 2 Center spar 0007 x 1A-in carbon fiber beContinued page 151 October 1988 147 16 40 45 50 58 88