Radio Control Scale Bob & Dolly Wischer CHICAGO EXPO New items RC Scale plentiful October Chicago trade show Ace RC promising several new items near future will find way models Nilite III on-board glow plug lighter switch mounted fuselage position actuated throttle ser vo separate servo switch bracket also serves mount ac tuating rod adjustable cam close circuit exact point servo travel ignite plug throttle ap proaches idle position Another new item Ace Nilite II poket size metered glow ignitor monitors glow plug condition Obechi veneer wood product used modelers other countries years hasnt readily available US Ace RC will offering obechi sheets suitable wing skins Advantages greater density lower cost balsa Indy RC Sales displayed two new OS four-stroke twins 240 previously seen prototype Toledo new 160 160 has same external dimensions older Gemini 120 appears bored-out version earlier twin Lady also offers extra cylin ders heads make up dummy cyl inder kit Gemini englne give appearance four-cylinder engine will add realism models air planes exposed engines such popular Piper Cub J-3 common problem Scale modelers refueling tube often visible spoil Scale image Du-Bro Products now offering Kwik-Fill fueling valve can easily hidden under cowl coupler fuel supply pump plugged fueling valve automatically shuts off supply carburetor Disconnecting plug reconnects fuel line carburetor Scale models dominated display tables Chicago Expo comeback year standard-size aircraft compared usually expected high quantity Giants models display least dozen excep tional quality Two particular out standing Harold Parenti duplicated enormous effort produce another Savoia Marchetti SM 79 Italian WW II trimotor bomber replace earlier lost radio-failure crash prior FAL team trials large model 81 wingspan follows current trend toward building up FAI weight limit 132 lb retractable landing gear three engines Savoia quali fies 2507o bonus applied its flight scores under FAI AMA Precision class Scale rules Hal has made own re tracts using mechanisms Pro-Line engines 05 25 two-strokes Re maining within rules could increased 40-size two-strokes 60 four-strokes providing model can kept within weight limit model presently weighs less 125 lbs four-stroke engines may heavier isnt need large weighty muf flers Savoia mostly balsa construc tion foam wing core Finish K&B epoxy over FabriKote fuselage silk wings Dennis Crooks displayed Grumman TBM Avenger impressive example superb craftsmanship servo-actu ated folding wings Dennis rela tively new competition flying has made very auspicious beginning win ning third place 1984 Scale Masters Tournament 1 in-scale Avenger Dennis Crooks fantastic Grumman TBM Avengor L has wing foidliock BCI ST 2500 engine powers 82in.span craft SavoiaMarchetti SM 79 tn-motor itaiian WW Ii bomber R second bbiit Hai Parenti first iost flying accident Craft spans 81 uses three OS 258 has foam-core wings Finish K&B epoxy its FAi competition Kitchener-Waterioo AliScaie Raily L Scratch-buiit Bucker Jungmeister Dick Speidei has returning severai years Biplane has working oieo struts iandlng gear uses Quadra Q35 engine its Super Coverite finished Randoiph dope Bob Neiitz brought superb new A-scale cupped-wing Tayloncraft R rally files Quadra Q50 power 40Model Aviation built drawings obtained through Bob Holman Plans Span 82 weight slightly less 20 lb now powered Supertigre 2500 Dennis mixed Navy Blue color K&B epoxy paints applied over fiberglass cloth resin 1984 may last year Chicago Expo held Odeum Villa Park Interior space Odeum sufficiently large Chicago Expo has always featured outdoor flying sessions area adjacent building too confining parking space also completely filled Arlington Park Race Track mentioned possible alter nate site future Expos Exhibitors space greater track infield offers unlimited flying area com bination could make na tions premier trade shows Kitchener-Waterloo Scale Rally revisited trend toward Giant Scale dominance rally Canada home everpopular Quadra engines has continued past few years Small models found numbers diminish mid-size range 10 18 pounds using large-displace ment glow plug engines Almost large heavy aircraft have sort scale detail would distinguish tru ly exceptional model attract attention clear rally-type modelers mostly interested flying airplanes con versation about modeling general socializing variety modeler gath ering has its attributes surely has followers pure competition activity competitor-types attendance Continued page 132 Brokaw Bullet custom-built airplane modeling subject Carl Small L Twelve-lb craft uses Webra 90 power equipped Glezendanner retracts Finish K&B epoxy over %-oz glass cloth Olean NYs STARS Club came squadron aircraft R including four Bristol Scouts concentrate Scale modeling emphasize flying 2 Box 2547 La Grande Ore 97850 Excellent trainer High-lift flat bottom air foil provides very stable slow-flight capabilities 57 Span See dealer order direct j1& IRCRAFT JIM ROHERTSPopular 40 Size Models 4 wail Aa4 de%&ned h4 eil alt 0 Eso4d fot fUa47 o/enpneeen dein e Aa deedofeed dse new Mat ate p*lea6r44e Srrdd Aytle6Enode6 9e mtwanttoftteace noili~4 crattMe e4t f4ee Very quick building will finished fore want Boautiful hand-picked spruce used ex tensively throughout Light weight very accurate durable structure Entirely new flutter-resistant detachable ailerons no hinge slots use bearings Leading edge shaped efficient highly accurate airfoil 0 Shaped finished parts no die cut parts structure Very versatile wings may interchanged models Exceptional slow-flight stability four models February 198541 La Grande Municipal Airport 503- 963-0596 mid-wing racy-looking sportster De signed all-around fun airplane Very fast yet easy fly 54 Span Super clean flying airplane easy trim flies groove very aerobatic 57 Span its highly maneuverable stable easy fly Extremely realistic ground air 47 Span Visa Master Card welcome Put simply just have wire coming receiver call antenna Think about minute just about other kind antenna exists dipole double-sided antenna Look TV antenna up roof rabbit ears top set CB antennas balanced maxi mum performance arent dipoles usually use ground plane electrically creates mirror image top part antenna ends up being balanced RC systems dont have nice metal hood act ground plane have circuitry receiver small amount wiring weve beome used small installations begin add substantial amounts wiring airborne system critical balance airborne system upset tending invite sorts unexplainable glitches using sep arate battery packs receiver servos wont cure imbalance weve created adding wires because have common ground connection tween battery packs wir ing still tied together can get away problem solution really obvious especial ly after youve spent about month tear ing hair Out looking Simply stated will completely isolate flight control system receiver accomplished using optical couplers use infrared light transfer signal receiver airborne system addition separate battery pack will used power servo system Furthermore after optical isolation will follow up signal buffer described earlier Thus have no connection between receiver servos wiring servo battery pack total complete isolation plus signal buffering Tune next month full construc tion article real glitch buster RC Scale/Wischers Continued page 41 present some relaxed fly ing pressure number par ticipants varies year year 1984 low point recent memory 110 registered modelers Any time Bob Nelitz brings out new airplane commands instant atten tion K-W recent effort placed display aerobatic clippedwing Taylorcraft A-scale Quadra 50cc engine As usual T-craft completely detailed including cock pit external fasteners fit tings wing struts landing gear engine cowl faithfully reproduced size rib stitching rib tapes correct-size pinked serrations interi work art Instruments controls upholstery internal tube structure easily seen through large areas plexiglass covering material light weight Ceconite finished Randolph butyrate dope prototype Dur ing time Bobs T-craft display constantly surrounded admirers Anyone has seen famous J-3 Cub DH Chipmunk may find hard believe could over shadowed T-craft must con sidered best work 30 lb weight Quadra doesnt really have easy time duplicating full-size aerobatics Prop changes may improve vertical maneuvers another Nelitz coming along father Bobs footsteps Brian Nelitz won three trophies FF Scale 1984 Nats Both days Kitchener-Waterloo Scale Rally afflicted strong wind blowing toward spectator line make landings awkward everyone willing fly situation flew could have air selves anytime rare ral ly long waits frequency pin normal expected Flying wind can lead some unanticipated surprises Jim Messer fell victim avoid being swept too far down wind made sudden steeply-banked turn quarter-scale Bristol Scout lower wing failed model descended rain parts torn fabric Quadra engine destroyed Jim has reputation Quadra mechanic wont surprised see repaired member STARS Club Olean NY foremost Scale organizations US well represented K-W group has rating system awarding crash points spent happy hour two argument value Jima rrassing mishap strongly suspect given maximum award though may have hidden damage inside wing previous hard landing always think sud denly-applied up-elevator control sharp turn can cause stall second thought can also result severe struc tural damage Flying Dutchmen Club flying field located park near Kitchener campground alongside nearly filled Friday Saturday nights Entertain ment stay corn roast movies highlights K-W Rally arrival STARS group avid Scale fliers Olean trailer loads airplanes large models powered engines Quadra type mixture includes Boeing P-26 four Bristol Scouts now three deHavilland DH-2 Ercoupe Cur tiss Hawk Falcon Fokker D-VIII form centerpiece model lineup sun shade surrounded model squadron Another regulars K-W Dick Speidel airplanes scratch-built Bucker Jungmeister AT-6 Ziroli fiberglass fuselage 4 cu Hornet engine Other regulars Cliff Tacie A-scale clipped-wing Piper Cub Gemini twin-powered Steve Gray DH 86B four-engine Rapide Express Overpropped model weight kept minimum benefit generally goes unrecognized using large-diameter propeller engine rpm can reduced about half fuel con sumption also proportionately less Power also less course power remaining providing propeller ef ficiency compensates power loss other words benefit great loss smaller prop moves small132Model Aviation FULL LINE METAL SPECIALISTS Al Featuring fast service qualified people latest equipment including SPECTRUM ANAL YZER AM FM SIGNAL GENERATOR Call Steve Helms Sam Leonard Tony Stiliman custom work competition needs stock complete hobby line specializing competition accessoriesall discounted prices Steve Helms 9Q4 478-6745 RADIO SOUTH~ AUTHORIZED SERVICE CENTEI FOR Kraft Pro LineFutaba I *iRI*IEIEI I--I --II 180 E Burgess Rd JR * Futaba Distributor er Inquiries Welcome * diameter cone air higher speed around fuselage friction ed dies turbulence rob moving air its effectiveness is particularly true models large round cowls radial dummy engines Tuibulence friction much reduced largediameter propeller because moving cone air lower velocity further away fuselage have heard stories overprop ping engine somehow injurious has proved true have using Supertigre 60 14-6 prop 16 years WW Sopwith engine good today new Wear actually reduced sixounce fuel tank needed 11000 rpm expect ST 60 use ounce fuel per minute experience shows rate A-ounce per minute 6000 rpm 14-6 prop engine runs cooler less internal friction minimize wear large prop permits slower realistic flight possible lightweight airplanes Heavier models will need airspeed full engine out put reasonable climb performance avoid risk stall after takeoff Impact damage heavier model always greater mishap element flight realism consid erably enhanced sound twostroke engine lower speed lowervolume exhaust gases muffler can restricted Sopwith muffler l-in-diameter aluminum tube solid end plate drilled A-in exit holes threading self-tapping screws several holes amount restriction can tuned best per formance least noise have heard comments Supertigre has sound very similar four-stroke engine model has flown often residential area neighbors arent aware engine sound ing up down often does both very quickly best thing situation slow airplane down very gentle colitrols try ease t6 landing Unfortunately usually occurs first flight airplane out trim anyway Survivors drama seldom have convinced airplane center mass needs moved forward proper range rest make sure its right next airplane center mass too far forward doesnt cause such dramatic conse quences lQt airplanes have bent because symptoms sim ple lot elevator necessary per form loops rolls flare airplatie landings airplane usually dinged landing pilot suddenly dis covets has stick way back airplane still sinking Mov- ing center mass back proper range will cure sinking feeling Bob Dolly Wischer S-221 Laphamkeep landing ear bottom side Peak Rd Delafield WI 53018of wing RC Aerobatics/Van Putte Continued page 45 thoughtlessly change airplanes center mass could mess up perfectly good airplane range locations airplanes center mass trimmable controlla ble stable range actually quite broad intentional reasoned move ment center mass often neces sary improve airplanes flying quali ties Beginners should always make sure airplanes center mass within range recommended plans dramatic consequence improper center mass location behind recommended area. An aft center mass can bring chills flier because airplane suddenly unstable pitch doesnt care whether its pitchRon Van Putte 111 Sleepy Qaks Rd Ft Walton Beach FL 32548 RC Old-Timers/Mathews Continued page 47 floats overhead Reduced 60% original size Pi1oh Buster shows enough potential hold its own AA Texaco competi tion full-sized fully-powered may well extraordinary Anyone has flying invited let us know goes Two approaches power runs credible explosion activity Y2A Tex aco a9ound world has introduced modelers joys RC OldTimer us thought lOssible Continised page 136 An better example quiet opera tion large prop diameters quarter-scale Aeronca K its Gemini 120 twin four-stroke engine recom mended 16-6 prop will yield 9000 rpm Hand-carved 18-7 props bring engine rpm down 6000 exhaust sound barely heard muffler difference between pro pellers negligible performance open throttle However Aeronca will fly near-scale speed about 4000 rpm large prop engine sound almost inaudible large engine just sips fuel throttle setting less ounce per minute carve props Because experimentation purchased props could quite expensive $10 $13 maple raw material prop costs about ior plus about hours time carving results arent satisfactory prop broken loss small February 198133 Pensacola FL 32503
Edition: Model Aviation - 1985/02
Page Numbers: 40, 41, 132, 133
Radio Control Scale Bob & Dolly Wischer CHICAGO EXPO New items RC Scale plentiful October Chicago trade show Ace RC promising several new items near future will find way models Nilite III on-board glow plug lighter switch mounted fuselage position actuated throttle ser vo separate servo switch bracket also serves mount ac tuating rod adjustable cam close circuit exact point servo travel ignite plug throttle ap proaches idle position Another new item Ace Nilite II poket size metered glow ignitor monitors glow plug condition Obechi veneer wood product used modelers other countries years hasnt readily available US Ace RC will offering obechi sheets suitable wing skins Advantages greater density lower cost balsa Indy RC Sales displayed two new OS four-stroke twins 240 previously seen prototype Toledo new 160 160 has same external dimensions older Gemini 120 appears bored-out version earlier twin Lady also offers extra cylin ders heads make up dummy cyl inder kit Gemini englne give appearance four-cylinder engine will add realism models air planes exposed engines such popular Piper Cub J-3 common problem Scale modelers refueling tube often visible spoil Scale image Du-Bro Products now offering Kwik-Fill fueling valve can easily hidden under cowl coupler fuel supply pump plugged fueling valve automatically shuts off supply carburetor Disconnecting plug reconnects fuel line carburetor Scale models dominated display tables Chicago Expo comeback year standard-size aircraft compared usually expected high quantity Giants models display least dozen excep tional quality Two particular out standing Harold Parenti duplicated enormous effort produce another Savoia Marchetti SM 79 Italian WW II trimotor bomber replace earlier lost radio-failure crash prior FAL team trials large model 81 wingspan follows current trend toward building up FAI weight limit 132 lb retractable landing gear three engines Savoia quali fies 2507o bonus applied its flight scores under FAI AMA Precision class Scale rules Hal has made own re tracts using mechanisms Pro-Line engines 05 25 two-strokes Re maining within rules could increased 40-size two-strokes 60 four-strokes providing model can kept within weight limit model presently weighs less 125 lbs four-stroke engines may heavier isnt need large weighty muf flers Savoia mostly balsa construc tion foam wing core Finish K&B epoxy over FabriKote fuselage silk wings Dennis Crooks displayed Grumman TBM Avenger impressive example superb craftsmanship servo-actu ated folding wings Dennis rela tively new competition flying has made very auspicious beginning win ning third place 1984 Scale Masters Tournament 1 in-scale Avenger Dennis Crooks fantastic Grumman TBM Avengor L has wing foidliock BCI ST 2500 engine powers 82in.span craft SavoiaMarchetti SM 79 tn-motor itaiian WW Ii bomber R second bbiit Hai Parenti first iost flying accident Craft spans 81 uses three OS 258 has foam-core wings Finish K&B epoxy its FAi competition Kitchener-Waterioo AliScaie Raily L Scratch-buiit Bucker Jungmeister Dick Speidei has returning severai years Biplane has working oieo struts iandlng gear uses Quadra Q35 engine its Super Coverite finished Randoiph dope Bob Neiitz brought superb new A-scale cupped-wing Tayloncraft R rally files Quadra Q50 power 40Model Aviation built drawings obtained through Bob Holman Plans Span 82 weight slightly less 20 lb now powered Supertigre 2500 Dennis mixed Navy Blue color K&B epoxy paints applied over fiberglass cloth resin 1984 may last year Chicago Expo held Odeum Villa Park Interior space Odeum sufficiently large Chicago Expo has always featured outdoor flying sessions area adjacent building too confining parking space also completely filled Arlington Park Race Track mentioned possible alter nate site future Expos Exhibitors space greater track infield offers unlimited flying area com bination could make na tions premier trade shows Kitchener-Waterloo Scale Rally revisited trend toward Giant Scale dominance rally Canada home everpopular Quadra engines has continued past few years Small models found numbers diminish mid-size range 10 18 pounds using large-displace ment glow plug engines Almost large heavy aircraft have sort scale detail would distinguish tru ly exceptional model attract attention clear rally-type modelers mostly interested flying airplanes con versation about modeling general socializing variety modeler gath ering has its attributes surely has followers pure competition activity competitor-types attendance Continued page 132 Brokaw Bullet custom-built airplane modeling subject Carl Small L Twelve-lb craft uses Webra 90 power equipped Glezendanner retracts Finish K&B epoxy over %-oz glass cloth Olean NYs STARS Club came squadron aircraft R including four Bristol Scouts concentrate Scale modeling emphasize flying 2 Box 2547 La Grande Ore 97850 Excellent trainer High-lift flat bottom air foil provides very stable slow-flight capabilities 57 Span See dealer order direct j1& IRCRAFT JIM ROHERTSPopular 40 Size Models 4 wail Aa4 de%&ned h4 eil alt 0 Eso4d fot fUa47 o/enpneeen dein e Aa deedofeed dse new Mat ate p*lea6r44e Srrdd Aytle6Enode6 9e mtwanttoftteace noili~4 crattMe e4t f4ee Very quick building will finished fore want Boautiful hand-picked spruce used ex tensively throughout Light weight very accurate durable structure Entirely new flutter-resistant detachable ailerons no hinge slots use bearings Leading edge shaped efficient highly accurate airfoil 0 Shaped finished parts no die cut parts structure Very versatile wings may interchanged models Exceptional slow-flight stability four models February 198541 La Grande Municipal Airport 503- 963-0596 mid-wing racy-looking sportster De signed all-around fun airplane Very fast yet easy fly 54 Span Super clean flying airplane easy trim flies groove very aerobatic 57 Span its highly maneuverable stable easy fly Extremely realistic ground air 47 Span Visa Master Card welcome Put simply just have wire coming receiver call antenna Think about minute just about other kind antenna exists dipole double-sided antenna Look TV antenna up roof rabbit ears top set CB antennas balanced maxi mum performance arent dipoles usually use ground plane electrically creates mirror image top part antenna ends up being balanced RC systems dont have nice metal hood act ground plane have circuitry receiver small amount wiring weve beome used small installations begin add substantial amounts wiring airborne system critical balance airborne system upset tending invite sorts unexplainable glitches using sep arate battery packs receiver servos wont cure imbalance weve created adding wires because have common ground connection tween battery packs wir ing still tied together can get away problem solution really obvious especial ly after youve spent about month tear ing hair Out looking Simply stated will completely isolate flight control system receiver accomplished using optical couplers use infrared light transfer signal receiver airborne system addition separate battery pack will used power servo system Furthermore after optical isolation will follow up signal buffer described earlier Thus have no connection between receiver servos wiring servo battery pack total complete isolation plus signal buffering Tune next month full construc tion article real glitch buster RC Scale/Wischers Continued page 41 present some relaxed fly ing pressure number par ticipants varies year year 1984 low point recent memory 110 registered modelers Any time Bob Nelitz brings out new airplane commands instant atten tion K-W recent effort placed display aerobatic clippedwing Taylorcraft A-scale Quadra 50cc engine As usual T-craft completely detailed including cock pit external fasteners fit tings wing struts landing gear engine cowl faithfully reproduced size rib stitching rib tapes correct-size pinked serrations interi work art Instruments controls upholstery internal tube structure easily seen through large areas plexiglass covering material light weight Ceconite finished Randolph butyrate dope prototype Dur ing time Bobs T-craft display constantly surrounded admirers Anyone has seen famous J-3 Cub DH Chipmunk may find hard believe could over shadowed T-craft must con sidered best work 30 lb weight Quadra doesnt really have easy time duplicating full-size aerobatics Prop changes may improve vertical maneuvers another Nelitz coming along father Bobs footsteps Brian Nelitz won three trophies FF Scale 1984 Nats Both days Kitchener-Waterloo Scale Rally afflicted strong wind blowing toward spectator line make landings awkward everyone willing fly situation flew could have air selves anytime rare ral ly long waits frequency pin normal expected Flying wind can lead some unanticipated surprises Jim Messer fell victim avoid being swept too far down wind made sudden steeply-banked turn quarter-scale Bristol Scout lower wing failed model descended rain parts torn fabric Quadra engine destroyed Jim has reputation Quadra mechanic wont surprised see repaired member STARS Club Olean NY foremost Scale organizations US well represented K-W group has rating system awarding crash points spent happy hour two argument value Jima rrassing mishap strongly suspect given maximum award though may have hidden damage inside wing previous hard landing always think sud denly-applied up-elevator control sharp turn can cause stall second thought can also result severe struc tural damage Flying Dutchmen Club flying field located park near Kitchener campground alongside nearly filled Friday Saturday nights Entertain ment stay corn roast movies highlights K-W Rally arrival STARS group avid Scale fliers Olean trailer loads airplanes large models powered engines Quadra type mixture includes Boeing P-26 four Bristol Scouts now three deHavilland DH-2 Ercoupe Cur tiss Hawk Falcon Fokker D-VIII form centerpiece model lineup sun shade surrounded model squadron Another regulars K-W Dick Speidel airplanes scratch-built Bucker Jungmeister AT-6 Ziroli fiberglass fuselage 4 cu Hornet engine Other regulars Cliff Tacie A-scale clipped-wing Piper Cub Gemini twin-powered Steve Gray DH 86B four-engine Rapide Express Overpropped model weight kept minimum benefit generally goes unrecognized using large-diameter propeller engine rpm can reduced about half fuel con sumption also proportionately less Power also less course power remaining providing propeller ef ficiency compensates power loss other words benefit great loss smaller prop moves small132Model Aviation FULL LINE METAL SPECIALISTS Al Featuring fast service qualified people latest equipment including SPECTRUM ANAL YZER AM FM SIGNAL GENERATOR Call Steve Helms Sam Leonard Tony Stiliman custom work competition needs stock complete hobby line specializing competition accessoriesall discounted prices Steve Helms 9Q4 478-6745 RADIO SOUTH~ AUTHORIZED SERVICE CENTEI FOR Kraft Pro LineFutaba I *iRI*IEIEI I--I --II 180 E Burgess Rd JR * Futaba Distributor er Inquiries Welcome * diameter cone air higher speed around fuselage friction ed dies turbulence rob moving air its effectiveness is particularly true models large round cowls radial dummy engines Tuibulence friction much reduced largediameter propeller because moving cone air lower velocity further away fuselage have heard stories overprop ping engine somehow injurious has proved true have using Supertigre 60 14-6 prop 16 years WW Sopwith engine good today new Wear actually reduced sixounce fuel tank needed 11000 rpm expect ST 60 use ounce fuel per minute experience shows rate A-ounce per minute 6000 rpm 14-6 prop engine runs cooler less internal friction minimize wear large prop permits slower realistic flight possible lightweight airplanes Heavier models will need airspeed full engine out put reasonable climb performance avoid risk stall after takeoff Impact damage heavier model always greater mishap element flight realism consid erably enhanced sound twostroke engine lower speed lowervolume exhaust gases muffler can restricted Sopwith muffler l-in-diameter aluminum tube solid end plate drilled A-in exit holes threading self-tapping screws several holes amount restriction can tuned best per formance least noise have heard comments Supertigre has sound very similar four-stroke engine model has flown often residential area neighbors arent aware engine sound ing up down often does both very quickly best thing situation slow airplane down very gentle colitrols try ease t6 landing Unfortunately usually occurs first flight airplane out trim anyway Survivors drama seldom have convinced airplane center mass needs moved forward proper range rest make sure its right next airplane center mass too far forward doesnt cause such dramatic conse quences lQt airplanes have bent because symptoms sim ple lot elevator necessary per form loops rolls flare airplatie landings airplane usually dinged landing pilot suddenly dis covets has stick way back airplane still sinking Mov- ing center mass back proper range will cure sinking feeling Bob Dolly Wischer S-221 Laphamkeep landing ear bottom side Peak Rd Delafield WI 53018of wing RC Aerobatics/Van Putte Continued page 45 thoughtlessly change airplanes center mass could mess up perfectly good airplane range locations airplanes center mass trimmable controlla ble stable range actually quite broad intentional reasoned move ment center mass often neces sary improve airplanes flying quali ties Beginners should always make sure airplanes center mass within range recommended plans dramatic consequence improper center mass location behind recommended area. An aft center mass can bring chills flier because airplane suddenly unstable pitch doesnt care whether its pitchRon Van Putte 111 Sleepy Qaks Rd Ft Walton Beach FL 32548 RC Old-Timers/Mathews Continued page 47 floats overhead Reduced 60% original size Pi1oh Buster shows enough potential hold its own AA Texaco competi tion full-sized fully-powered may well extraordinary Anyone has flying invited let us know goes Two approaches power runs credible explosion activity Y2A Tex aco a9ound world has introduced modelers joys RC OldTimer us thought lOssible Continised page 136 An better example quiet opera tion large prop diameters quarter-scale Aeronca K its Gemini 120 twin four-stroke engine recom mended 16-6 prop will yield 9000 rpm Hand-carved 18-7 props bring engine rpm down 6000 exhaust sound barely heard muffler difference between pro pellers negligible performance open throttle However Aeronca will fly near-scale speed about 4000 rpm large prop engine sound almost inaudible large engine just sips fuel throttle setting less ounce per minute carve props Because experimentation purchased props could quite expensive $10 $13 maple raw material prop costs about ior plus about hours time carving results arent satisfactory prop broken loss small February 198133 Pensacola FL 32503
Edition: Model Aviation - 1985/02
Page Numbers: 40, 41, 132, 133
Radio Control Scale Bob & Dolly Wischer CHICAGO EXPO New items RC Scale plentiful October Chicago trade show Ace RC promising several new items near future will find way models Nilite III on-board glow plug lighter switch mounted fuselage position actuated throttle ser vo separate servo switch bracket also serves mount ac tuating rod adjustable cam close circuit exact point servo travel ignite plug throttle ap proaches idle position Another new item Ace Nilite II poket size metered glow ignitor monitors glow plug condition Obechi veneer wood product used modelers other countries years hasnt readily available US Ace RC will offering obechi sheets suitable wing skins Advantages greater density lower cost balsa Indy RC Sales displayed two new OS four-stroke twins 240 previously seen prototype Toledo new 160 160 has same external dimensions older Gemini 120 appears bored-out version earlier twin Lady also offers extra cylin ders heads make up dummy cyl inder kit Gemini englne give appearance four-cylinder engine will add realism models air planes exposed engines such popular Piper Cub J-3 common problem Scale modelers refueling tube often visible spoil Scale image Du-Bro Products now offering Kwik-Fill fueling valve can easily hidden under cowl coupler fuel supply pump plugged fueling valve automatically shuts off supply carburetor Disconnecting plug reconnects fuel line carburetor Scale models dominated display tables Chicago Expo comeback year standard-size aircraft compared usually expected high quantity Giants models display least dozen excep tional quality Two particular out standing Harold Parenti duplicated enormous effort produce another Savoia Marchetti SM 79 Italian WW II trimotor bomber replace earlier lost radio-failure crash prior FAL team trials large model 81 wingspan follows current trend toward building up FAI weight limit 132 lb retractable landing gear three engines Savoia quali fies 2507o bonus applied its flight scores under FAI AMA Precision class Scale rules Hal has made own re tracts using mechanisms Pro-Line engines 05 25 two-strokes Re maining within rules could increased 40-size two-strokes 60 four-strokes providing model can kept within weight limit model presently weighs less 125 lbs four-stroke engines may heavier isnt need large weighty muf flers Savoia mostly balsa construc tion foam wing core Finish K&B epoxy over FabriKote fuselage silk wings Dennis Crooks displayed Grumman TBM Avenger impressive example superb craftsmanship servo-actu ated folding wings Dennis rela tively new competition flying has made very auspicious beginning win ning third place 1984 Scale Masters Tournament 1 in-scale Avenger Dennis Crooks fantastic Grumman TBM Avengor L has wing foidliock BCI ST 2500 engine powers 82in.span craft SavoiaMarchetti SM 79 tn-motor itaiian WW Ii bomber R second bbiit Hai Parenti first iost flying accident Craft spans 81 uses three OS 258 has foam-core wings Finish K&B epoxy its FAi competition Kitchener-Waterioo AliScaie Raily L Scratch-buiit Bucker Jungmeister Dick Speidei has returning severai years Biplane has working oieo struts iandlng gear uses Quadra Q35 engine its Super Coverite finished Randoiph dope Bob Neiitz brought superb new A-scale cupped-wing Tayloncraft R rally files Quadra Q50 power 40Model Aviation built drawings obtained through Bob Holman Plans Span 82 weight slightly less 20 lb now powered Supertigre 2500 Dennis mixed Navy Blue color K&B epoxy paints applied over fiberglass cloth resin 1984 may last year Chicago Expo held Odeum Villa Park Interior space Odeum sufficiently large Chicago Expo has always featured outdoor flying sessions area adjacent building too confining parking space also completely filled Arlington Park Race Track mentioned possible alter nate site future Expos Exhibitors space greater track infield offers unlimited flying area com bination could make na tions premier trade shows Kitchener-Waterloo Scale Rally revisited trend toward Giant Scale dominance rally Canada home everpopular Quadra engines has continued past few years Small models found numbers diminish mid-size range 10 18 pounds using large-displace ment glow plug engines Almost large heavy aircraft have sort scale detail would distinguish tru ly exceptional model attract attention clear rally-type modelers mostly interested flying airplanes con versation about modeling general socializing variety modeler gath ering has its attributes surely has followers pure competition activity competitor-types attendance Continued page 132 Brokaw Bullet custom-built airplane modeling subject Carl Small L Twelve-lb craft uses Webra 90 power equipped Glezendanner retracts Finish K&B epoxy over %-oz glass cloth Olean NYs STARS Club came squadron aircraft R including four Bristol Scouts concentrate Scale modeling emphasize flying 2 Box 2547 La Grande Ore 97850 Excellent trainer High-lift flat bottom air foil provides very stable slow-flight capabilities 57 Span See dealer order direct j1& IRCRAFT JIM ROHERTSPopular 40 Size Models 4 wail Aa4 de%&ned h4 eil alt 0 Eso4d fot fUa47 o/enpneeen dein e Aa deedofeed dse new Mat ate p*lea6r44e Srrdd Aytle6Enode6 9e mtwanttoftteace noili~4 crattMe e4t f4ee Very quick building will finished fore want Boautiful hand-picked spruce used ex tensively throughout Light weight very accurate durable structure Entirely new flutter-resistant detachable ailerons no hinge slots use bearings Leading edge shaped efficient highly accurate airfoil 0 Shaped finished parts no die cut parts structure Very versatile wings may interchanged models Exceptional slow-flight stability four models February 198541 La Grande Municipal Airport 503- 963-0596 mid-wing racy-looking sportster De signed all-around fun airplane Very fast yet easy fly 54 Span Super clean flying airplane easy trim flies groove very aerobatic 57 Span its highly maneuverable stable easy fly Extremely realistic ground air 47 Span Visa Master Card welcome Put simply just have wire coming receiver call antenna Think about minute just about other kind antenna exists dipole double-sided antenna Look TV antenna up roof rabbit ears top set CB antennas balanced maxi mum performance arent dipoles usually use ground plane electrically creates mirror image top part antenna ends up being balanced RC systems dont have nice metal hood act ground plane have circuitry receiver small amount wiring weve beome used small installations begin add substantial amounts wiring airborne system critical balance airborne system upset tending invite sorts unexplainable glitches using sep arate battery packs receiver servos wont cure imbalance weve created adding wires because have common ground connection tween battery packs wir ing still tied together can get away problem solution really obvious especial ly after youve spent about month tear ing hair Out looking Simply stated will completely isolate flight control system receiver accomplished using optical couplers use infrared light transfer signal receiver airborne system addition separate battery pack will used power servo system Furthermore after optical isolation will follow up signal buffer described earlier Thus have no connection between receiver servos wiring servo battery pack total complete isolation plus signal buffering Tune next month full construc tion article real glitch buster RC Scale/Wischers Continued page 41 present some relaxed fly ing pressure number par ticipants varies year year 1984 low point recent memory 110 registered modelers Any time Bob Nelitz brings out new airplane commands instant atten tion K-W recent effort placed display aerobatic clippedwing Taylorcraft A-scale Quadra 50cc engine As usual T-craft completely detailed including cock pit external fasteners fit tings wing struts landing gear engine cowl faithfully reproduced size rib stitching rib tapes correct-size pinked serrations interi work art Instruments controls upholstery internal tube structure easily seen through large areas plexiglass covering material light weight Ceconite finished Randolph butyrate dope prototype Dur ing time Bobs T-craft display constantly surrounded admirers Anyone has seen famous J-3 Cub DH Chipmunk may find hard believe could over shadowed T-craft must con sidered best work 30 lb weight Quadra doesnt really have easy time duplicating full-size aerobatics Prop changes may improve vertical maneuvers another Nelitz coming along father Bobs footsteps Brian Nelitz won three trophies FF Scale 1984 Nats Both days Kitchener-Waterloo Scale Rally afflicted strong wind blowing toward spectator line make landings awkward everyone willing fly situation flew could have air selves anytime rare ral ly long waits frequency pin normal expected Flying wind can lead some unanticipated surprises Jim Messer fell victim avoid being swept too far down wind made sudden steeply-banked turn quarter-scale Bristol Scout lower wing failed model descended rain parts torn fabric Quadra engine destroyed Jim has reputation Quadra mechanic wont surprised see repaired member STARS Club Olean NY foremost Scale organizations US well represented K-W group has rating system awarding crash points spent happy hour two argument value Jima rrassing mishap strongly suspect given maximum award though may have hidden damage inside wing previous hard landing always think sud denly-applied up-elevator control sharp turn can cause stall second thought can also result severe struc tural damage Flying Dutchmen Club flying field located park near Kitchener campground alongside nearly filled Friday Saturday nights Entertain ment stay corn roast movies highlights K-W Rally arrival STARS group avid Scale fliers Olean trailer loads airplanes large models powered engines Quadra type mixture includes Boeing P-26 four Bristol Scouts now three deHavilland DH-2 Ercoupe Cur tiss Hawk Falcon Fokker D-VIII form centerpiece model lineup sun shade surrounded model squadron Another regulars K-W Dick Speidel airplanes scratch-built Bucker Jungmeister AT-6 Ziroli fiberglass fuselage 4 cu Hornet engine Other regulars Cliff Tacie A-scale clipped-wing Piper Cub Gemini twin-powered Steve Gray DH 86B four-engine Rapide Express Overpropped model weight kept minimum benefit generally goes unrecognized using large-diameter propeller engine rpm can reduced about half fuel con sumption also proportionately less Power also less course power remaining providing propeller ef ficiency compensates power loss other words benefit great loss smaller prop moves small132Model Aviation FULL LINE METAL SPECIALISTS Al Featuring fast service qualified people latest equipment including SPECTRUM ANAL YZER AM FM SIGNAL GENERATOR Call Steve Helms Sam Leonard Tony Stiliman custom work competition needs stock complete hobby line specializing competition accessoriesall discounted prices Steve Helms 9Q4 478-6745 RADIO SOUTH~ AUTHORIZED SERVICE CENTEI FOR Kraft Pro LineFutaba I *iRI*IEIEI I--I --II 180 E Burgess Rd JR * Futaba Distributor er Inquiries Welcome * diameter cone air higher speed around fuselage friction ed dies turbulence rob moving air its effectiveness is particularly true models large round cowls radial dummy engines Tuibulence friction much reduced largediameter propeller because moving cone air lower velocity further away fuselage have heard stories overprop ping engine somehow injurious has proved true have using Supertigre 60 14-6 prop 16 years WW Sopwith engine good today new Wear actually reduced sixounce fuel tank needed 11000 rpm expect ST 60 use ounce fuel per minute experience shows rate A-ounce per minute 6000 rpm 14-6 prop engine runs cooler less internal friction minimize wear large prop permits slower realistic flight possible lightweight airplanes Heavier models will need airspeed full engine out put reasonable climb performance avoid risk stall after takeoff Impact damage heavier model always greater mishap element flight realism consid erably enhanced sound twostroke engine lower speed lowervolume exhaust gases muffler can restricted Sopwith muffler l-in-diameter aluminum tube solid end plate drilled A-in exit holes threading self-tapping screws several holes amount restriction can tuned best per formance least noise have heard comments Supertigre has sound very similar four-stroke engine model has flown often residential area neighbors arent aware engine sound ing up down often does both very quickly best thing situation slow airplane down very gentle colitrols try ease t6 landing Unfortunately usually occurs first flight airplane out trim anyway Survivors drama seldom have convinced airplane center mass needs moved forward proper range rest make sure its right next airplane center mass too far forward doesnt cause such dramatic conse quences lQt airplanes have bent because symptoms sim ple lot elevator necessary per form loops rolls flare airplatie landings airplane usually dinged landing pilot suddenly dis covets has stick way back airplane still sinking Mov- ing center mass back proper range will cure sinking feeling Bob Dolly Wischer S-221 Laphamkeep landing ear bottom side Peak Rd Delafield WI 53018of wing RC Aerobatics/Van Putte Continued page 45 thoughtlessly change airplanes center mass could mess up perfectly good airplane range locations airplanes center mass trimmable controlla ble stable range actually quite broad intentional reasoned move ment center mass often neces sary improve airplanes flying quali ties Beginners should always make sure airplanes center mass within range recommended plans dramatic consequence improper center mass location behind recommended area. An aft center mass can bring chills flier because airplane suddenly unstable pitch doesnt care whether its pitchRon Van Putte 111 Sleepy Qaks Rd Ft Walton Beach FL 32548 RC Old-Timers/Mathews Continued page 47 floats overhead Reduced 60% original size Pi1oh Buster shows enough potential hold its own AA Texaco competi tion full-sized fully-powered may well extraordinary Anyone has flying invited let us know goes Two approaches power runs credible explosion activity Y2A Tex aco a9ound world has introduced modelers joys RC OldTimer us thought lOssible Continised page 136 An better example quiet opera tion large prop diameters quarter-scale Aeronca K its Gemini 120 twin four-stroke engine recom mended 16-6 prop will yield 9000 rpm Hand-carved 18-7 props bring engine rpm down 6000 exhaust sound barely heard muffler difference between pro pellers negligible performance open throttle However Aeronca will fly near-scale speed about 4000 rpm large prop engine sound almost inaudible large engine just sips fuel throttle setting less ounce per minute carve props Because experimentation purchased props could quite expensive $10 $13 maple raw material prop costs about ior plus about hours time carving results arent satisfactory prop broken loss small February 198133 Pensacola FL 32503
Edition: Model Aviation - 1985/02
Page Numbers: 40, 41, 132, 133
Radio Control Scale Bob & Dolly Wischer CHICAGO EXPO New items RC Scale plentiful October Chicago trade show Ace RC promising several new items near future will find way models Nilite III on-board glow plug lighter switch mounted fuselage position actuated throttle ser vo separate servo switch bracket also serves mount ac tuating rod adjustable cam close circuit exact point servo travel ignite plug throttle ap proaches idle position Another new item Ace Nilite II poket size metered glow ignitor monitors glow plug condition Obechi veneer wood product used modelers other countries years hasnt readily available US Ace RC will offering obechi sheets suitable wing skins Advantages greater density lower cost balsa Indy RC Sales displayed two new OS four-stroke twins 240 previously seen prototype Toledo new 160 160 has same external dimensions older Gemini 120 appears bored-out version earlier twin Lady also offers extra cylin ders heads make up dummy cyl inder kit Gemini englne give appearance four-cylinder engine will add realism models air planes exposed engines such popular Piper Cub J-3 common problem Scale modelers refueling tube often visible spoil Scale image Du-Bro Products now offering Kwik-Fill fueling valve can easily hidden under cowl coupler fuel supply pump plugged fueling valve automatically shuts off supply carburetor Disconnecting plug reconnects fuel line carburetor Scale models dominated display tables Chicago Expo comeback year standard-size aircraft compared usually expected high quantity Giants models display least dozen excep tional quality Two particular out standing Harold Parenti duplicated enormous effort produce another Savoia Marchetti SM 79 Italian WW II trimotor bomber replace earlier lost radio-failure crash prior FAL team trials large model 81 wingspan follows current trend toward building up FAI weight limit 132 lb retractable landing gear three engines Savoia quali fies 2507o bonus applied its flight scores under FAI AMA Precision class Scale rules Hal has made own re tracts using mechanisms Pro-Line engines 05 25 two-strokes Re maining within rules could increased 40-size two-strokes 60 four-strokes providing model can kept within weight limit model presently weighs less 125 lbs four-stroke engines may heavier isnt need large weighty muf flers Savoia mostly balsa construc tion foam wing core Finish K&B epoxy over FabriKote fuselage silk wings Dennis Crooks displayed Grumman TBM Avenger impressive example superb craftsmanship servo-actu ated folding wings Dennis rela tively new competition flying has made very auspicious beginning win ning third place 1984 Scale Masters Tournament 1 in-scale Avenger Dennis Crooks fantastic Grumman TBM Avengor L has wing foidliock BCI ST 2500 engine powers 82in.span craft SavoiaMarchetti SM 79 tn-motor itaiian WW Ii bomber R second bbiit Hai Parenti first iost flying accident Craft spans 81 uses three OS 258 has foam-core wings Finish K&B epoxy its FAi competition Kitchener-Waterioo AliScaie Raily L Scratch-buiit Bucker Jungmeister Dick Speidei has returning severai years Biplane has working oieo struts iandlng gear uses Quadra Q35 engine its Super Coverite finished Randoiph dope Bob Neiitz brought superb new A-scale cupped-wing Tayloncraft R rally files Quadra Q50 power 40Model Aviation built drawings obtained through Bob Holman Plans Span 82 weight slightly less 20 lb now powered Supertigre 2500 Dennis mixed Navy Blue color K&B epoxy paints applied over fiberglass cloth resin 1984 may last year Chicago Expo held Odeum Villa Park Interior space Odeum sufficiently large Chicago Expo has always featured outdoor flying sessions area adjacent building too confining parking space also completely filled Arlington Park Race Track mentioned possible alter nate site future Expos Exhibitors space greater track infield offers unlimited flying area com bination could make na tions premier trade shows Kitchener-Waterloo Scale Rally revisited trend toward Giant Scale dominance rally Canada home everpopular Quadra engines has continued past few years Small models found numbers diminish mid-size range 10 18 pounds using large-displace ment glow plug engines Almost large heavy aircraft have sort scale detail would distinguish tru ly exceptional model attract attention clear rally-type modelers mostly interested flying airplanes con versation about modeling general socializing variety modeler gath ering has its attributes surely has followers pure competition activity competitor-types attendance Continued page 132 Brokaw Bullet custom-built airplane modeling subject Carl Small L Twelve-lb craft uses Webra 90 power equipped Glezendanner retracts Finish K&B epoxy over %-oz glass cloth Olean NYs STARS Club came squadron aircraft R including four Bristol Scouts concentrate Scale modeling emphasize flying 2 Box 2547 La Grande Ore 97850 Excellent trainer High-lift flat bottom air foil provides very stable slow-flight capabilities 57 Span See dealer order direct j1& IRCRAFT JIM ROHERTSPopular 40 Size Models 4 wail Aa4 de%&ned h4 eil alt 0 Eso4d fot fUa47 o/enpneeen dein e Aa deedofeed dse new Mat ate p*lea6r44e Srrdd Aytle6Enode6 9e mtwanttoftteace noili~4 crattMe e4t f4ee Very quick building will finished fore want Boautiful hand-picked spruce used ex tensively throughout Light weight very accurate durable structure Entirely new flutter-resistant detachable ailerons no hinge slots use bearings Leading edge shaped efficient highly accurate airfoil 0 Shaped finished parts no die cut parts structure Very versatile wings may interchanged models Exceptional slow-flight stability four models February 198541 La Grande Municipal Airport 503- 963-0596 mid-wing racy-looking sportster De signed all-around fun airplane Very fast yet easy fly 54 Span Super clean flying airplane easy trim flies groove very aerobatic 57 Span its highly maneuverable stable easy fly Extremely realistic ground air 47 Span Visa Master Card welcome Put simply just have wire coming receiver call antenna Think about minute just about other kind antenna exists dipole double-sided antenna Look TV antenna up roof rabbit ears top set CB antennas balanced maxi mum performance arent dipoles usually use ground plane electrically creates mirror image top part antenna ends up being balanced RC systems dont have nice metal hood act ground plane have circuitry receiver small amount wiring weve beome used small installations begin add substantial amounts wiring airborne system critical balance airborne system upset tending invite sorts unexplainable glitches using sep arate battery packs receiver servos wont cure imbalance weve created adding wires because have common ground connection tween battery packs wir ing still tied together can get away problem solution really obvious especial ly after youve spent about month tear ing hair Out looking Simply stated will completely isolate flight control system receiver accomplished using optical couplers use infrared light transfer signal receiver airborne system addition separate battery pack will used power servo system Furthermore after optical isolation will follow up signal buffer described earlier Thus have no connection between receiver servos wiring servo battery pack total complete isolation plus signal buffering Tune next month full construc tion article real glitch buster RC Scale/Wischers Continued page 41 present some relaxed fly ing pressure number par ticipants varies year year 1984 low point recent memory 110 registered modelers Any time Bob Nelitz brings out new airplane commands instant atten tion K-W recent effort placed display aerobatic clippedwing Taylorcraft A-scale Quadra 50cc engine As usual T-craft completely detailed including cock pit external fasteners fit tings wing struts landing gear engine cowl faithfully reproduced size rib stitching rib tapes correct-size pinked serrations interi work art Instruments controls upholstery internal tube structure easily seen through large areas plexiglass covering material light weight Ceconite finished Randolph butyrate dope prototype Dur ing time Bobs T-craft display constantly surrounded admirers Anyone has seen famous J-3 Cub DH Chipmunk may find hard believe could over shadowed T-craft must con sidered best work 30 lb weight Quadra doesnt really have easy time duplicating full-size aerobatics Prop changes may improve vertical maneuvers another Nelitz coming along father Bobs footsteps Brian Nelitz won three trophies FF Scale 1984 Nats Both days Kitchener-Waterloo Scale Rally afflicted strong wind blowing toward spectator line make landings awkward everyone willing fly situation flew could have air selves anytime rare ral ly long waits frequency pin normal expected Flying wind can lead some unanticipated surprises Jim Messer fell victim avoid being swept too far down wind made sudden steeply-banked turn quarter-scale Bristol Scout lower wing failed model descended rain parts torn fabric Quadra engine destroyed Jim has reputation Quadra mechanic wont surprised see repaired member STARS Club Olean NY foremost Scale organizations US well represented K-W group has rating system awarding crash points spent happy hour two argument value Jima rrassing mishap strongly suspect given maximum award though may have hidden damage inside wing previous hard landing always think sud denly-applied up-elevator control sharp turn can cause stall second thought can also result severe struc tural damage Flying Dutchmen Club flying field located park near Kitchener campground alongside nearly filled Friday Saturday nights Entertain ment stay corn roast movies highlights K-W Rally arrival STARS group avid Scale fliers Olean trailer loads airplanes large models powered engines Quadra type mixture includes Boeing P-26 four Bristol Scouts now three deHavilland DH-2 Ercoupe Cur tiss Hawk Falcon Fokker D-VIII form centerpiece model lineup sun shade surrounded model squadron Another regulars K-W Dick Speidel airplanes scratch-built Bucker Jungmeister AT-6 Ziroli fiberglass fuselage 4 cu Hornet engine Other regulars Cliff Tacie A-scale clipped-wing Piper Cub Gemini twin-powered Steve Gray DH 86B four-engine Rapide Express Overpropped model weight kept minimum benefit generally goes unrecognized using large-diameter propeller engine rpm can reduced about half fuel con sumption also proportionately less Power also less course power remaining providing propeller ef ficiency compensates power loss other words benefit great loss smaller prop moves small132Model Aviation FULL LINE METAL SPECIALISTS Al Featuring fast service qualified people latest equipment including SPECTRUM ANAL YZER AM FM SIGNAL GENERATOR Call Steve Helms Sam Leonard Tony Stiliman custom work competition needs stock complete hobby line specializing competition accessoriesall discounted prices Steve Helms 9Q4 478-6745 RADIO SOUTH~ AUTHORIZED SERVICE CENTEI FOR Kraft Pro LineFutaba I *iRI*IEIEI I--I --II 180 E Burgess Rd JR * Futaba Distributor er Inquiries Welcome * diameter cone air higher speed around fuselage friction ed dies turbulence rob moving air its effectiveness is particularly true models large round cowls radial dummy engines Tuibulence friction much reduced largediameter propeller because moving cone air lower velocity further away fuselage have heard stories overprop ping engine somehow injurious has proved true have using Supertigre 60 14-6 prop 16 years WW Sopwith engine good today new Wear actually reduced sixounce fuel tank needed 11000 rpm expect ST 60 use ounce fuel per minute experience shows rate A-ounce per minute 6000 rpm 14-6 prop engine runs cooler less internal friction minimize wear large prop permits slower realistic flight possible lightweight airplanes Heavier models will need airspeed full engine out put reasonable climb performance avoid risk stall after takeoff Impact damage heavier model always greater mishap element flight realism consid erably enhanced sound twostroke engine lower speed lowervolume exhaust gases muffler can restricted Sopwith muffler l-in-diameter aluminum tube solid end plate drilled A-in exit holes threading self-tapping screws several holes amount restriction can tuned best per formance least noise have heard comments Supertigre has sound very similar four-stroke engine model has flown often residential area neighbors arent aware engine sound ing up down often does both very quickly best thing situation slow airplane down very gentle colitrols try ease t6 landing Unfortunately usually occurs first flight airplane out trim anyway Survivors drama seldom have convinced airplane center mass needs moved forward proper range rest make sure its right next airplane center mass too far forward doesnt cause such dramatic conse quences lQt airplanes have bent because symptoms sim ple lot elevator necessary per form loops rolls flare airplatie landings airplane usually dinged landing pilot suddenly dis covets has stick way back airplane still sinking Mov- ing center mass back proper range will cure sinking feeling Bob Dolly Wischer S-221 Laphamkeep landing ear bottom side Peak Rd Delafield WI 53018of wing RC Aerobatics/Van Putte Continued page 45 thoughtlessly change airplanes center mass could mess up perfectly good airplane range locations airplanes center mass trimmable controlla ble stable range actually quite broad intentional reasoned move ment center mass often neces sary improve airplanes flying quali ties Beginners should always make sure airplanes center mass within range recommended plans dramatic consequence improper center mass location behind recommended area. An aft center mass can bring chills flier because airplane suddenly unstable pitch doesnt care whether its pitchRon Van Putte 111 Sleepy Qaks Rd Ft Walton Beach FL 32548 RC Old-Timers/Mathews Continued page 47 floats overhead Reduced 60% original size Pi1oh Buster shows enough potential hold its own AA Texaco competi tion full-sized fully-powered may well extraordinary Anyone has flying invited let us know goes Two approaches power runs credible explosion activity Y2A Tex aco a9ound world has introduced modelers joys RC OldTimer us thought lOssible Continised page 136 An better example quiet opera tion large prop diameters quarter-scale Aeronca K its Gemini 120 twin four-stroke engine recom mended 16-6 prop will yield 9000 rpm Hand-carved 18-7 props bring engine rpm down 6000 exhaust sound barely heard muffler difference between pro pellers negligible performance open throttle However Aeronca will fly near-scale speed about 4000 rpm large prop engine sound almost inaudible large engine just sips fuel throttle setting less ounce per minute carve props Because experimentation purchased props could quite expensive $10 $13 maple raw material prop costs about ior plus about hours time carving results arent satisfactory prop broken loss small February 198133 Pensacola FL 32503