Scale WITH THE BIGGEST part 75 con test season about over country Im sure thinking about next season coming winters building time reports what Ive seen Stand-off Scale real biggie past year great interest writer interest WW II contests seem growing coast coast As have stated before seems something fascinating about warbirds WW II fine subjects pick especially WW II types can adapted Stand-off Scale Modelers seem coming up new ones time Birds thought im practical just few years ago AMA scale little modification make good flying Stand-off Scale birds great what Stand-off created Its too bad again AMA scale models Nats drastically down number air planes have around several years no wonder takes 2-3 years build adequately test fly AMA Scale com petitive under rules Its said times before need some rule changes stimulate interest AMA Scale fine Scale Stand-off Scale kits out now lets say dont want build P-51 Spitfire kits Generally scale buffs have particular continued page 78 Helicopters THE COLLECTIVE helicopter presents very different set trimming problems Most collective helicopters operate much higher blade speed fixed machines setting up power curve engine must determined absolutely essential maximum blade pitch reached up side power curve engine also important near constant blade speed achieved Both factors rather diffi cult obtain will require some very pre cise adjusting First need make visual device quickly determine approximately 5/ carburator barrel opening Kavan can done dental mirror held up barrel taking look see accomplish have stop engine has take time may have done numerous times much easier method bolt small aluminum plate about high 1 long behind engine bellcrank can 1/16 thick lesswhatever scrap may have Once bolted place now needs calibrated Turn radio transmitter set collective control motor control full low motor trim full high Now mark plate indicating bellerank position full low speed advance collective full high mark position next retard half collective mark position plate easy mark /s l Gazelle can accomplished calibrating motor pushrod goes through cooling duct Now easy look Bud Atkinson through window see carburator bar rel position motor pushrod should now adjusted el opening occurs transmitter collective control half full motor trim pitch setting should permit helicopter lift off point now determine maximum pitch can achieved up side power curve will have Below Bob Strobels Messerschmitt Me-262 jet stable flies fast Its Supertigre 60 Bottom fiberglass P-38 J E Alexander used home-made molds Own retracts tires lift helicopter off Kavan should least 5000 rpms lift-off Gazelle about 4000 rpms During testing make sure heli copter facing downwind maximum pitch should now adjusted tail-rotor speed remains near constant possible continued page 78 January1976 19 g Flight lines pit areas helicopters yata commonplace sight movement w alt cnoonara Walt considers month qInth getting surely big problem training NEWNEWNEW NEWNEWNEW NEWNEWNEW Custom blended12 Volt Fuel Pump Oper Bill Hagerate 12v starting Sport RC Pylon Racingbattery Economy pump12 Volt Starting Battery 55 blends Castor Klotz oil$1095 Deluxe pump withamp Ideal use blends FAI 700/0leads switch fuel linenew 12v fuel pump nitro$1295any 12v starter $1320 Harrys Hobbies IncPhone 513 276-5898 5224 North Dixie DriveDealer inquiries invitedDayton Ohio 45414 CL Combat continued Englishman Richard Wilkens years Nationals Richard gave Ameri cans treatment made us think about might match up against other British European fliers doubt neither Rich ard nor myself changed minds fliers got chance see things done differently technical scene reported Ron Sheldon Tony Guest coming close making Fox Schnuerle truly competitive engine others throughout country working parallel courses reports over indicate things look promising Supertigre took Tom Uptons advice re designed G21-35BB new Combat Special K&B has introduced new 35 aimed sport market addition 4OBB front-end peripheral jet venturi about fastest out box engine going FAI Combat has another escal FAI Combat has another esca lation horsepower sophistication Die hard British diesel fliers have switched Rossi diesels now keeping up G20 GIS Glow boys switch Rossi glows new kind contest works Southern California Special Pro Combat Association will hold its first contest San Diego December 7th contestants will fly minimum four rounds will invitation Bellcrank artists poor sports full-time line tanglers will invited AMA makes provision such contests offering Class B sanction type contest has tried past worked successfully less 30 entries would like send pictures comments just complaints may reached 3716 Ingraham St San Diego Calif 92109 714 273-6530 RC Helicopters/Schoonard continued page 19 point pet engine will show its ugly face will have tweak needle valve order get enough power under sustained collective setting will heat up start drop off power curve have good powerful engine its power output will crease during increased collective settings trial error process will have em ployed get tail-rotor pitch mix set tings proper start set tail-rotor pitch per manufacturers instructions tail-rotor mix 40-60 percent relationship tail-rotor mix needs adjusted add collective proper tail-rotor pitch added proper time little time spent will very rewarding later turn machine loose will go straight up tail swinging around have achieved will end result up side power curve constant blade speed proper mix relationship have seen lot people heard about lot can control tail rotor revert gyros kinds devices neces sary fact gyro wont help much underpowered out-of-trim helicopter may become too popular making kind statement truth helicopters have demonstrated rapid take-offs rapid de scents rock steady hands-off hovering wind Lately have flying Schluter Heli Baby little marvel flies hands off kinds weatheryes tail will fly hands off am really excited about rugged helicopter couple weeks ago show ing off stalled hit ground really hard about 60 feet bounced end over end like football damage bent output shaft side frames blade hold ers straightened parts replaced main blades flew right off super helicopter learn fly Next months column going deal Goodies Gadgets Such things heli copter Insurance both flight ground other equally exciting subjects column needs pictures creations espe cially incorporates some unique features Please direct correspondence RC Helicopt ers care Walt Schoonard 2080 Sharon Road Winter Park Fla 32789 RC Scale/Atkinson continued page 19 airplane attracted reason another has some fascination An other reason wanting build particular airplane will adapt well RC scale model first consideration powerplant just large want 45 60 pow ered Most Scale AMA Stand-off competition should 60-powered bird course extra detailing retracts used will give much higher wing loading say pattern sport bird Next course ob tain much information possible subject good set three views must make building plans its Stand-off Scale modifications can made insure better flying model changing outline too much aerodynamics involved scratch build ing scale model would make sizeable book may get part later articles best ways draw up scale model use other successful models starting point such good kit scale plans magazines Most standard airplanes ordinarily about same simply continuation other course exceptions Most WW II air craft basically same configuration de pending roles played such fight ers bombers dive-bombers reconnaissance etc over lay Spitfire P-SI ME109 Japanese Tony Macchi 202 would surprised moments would compa rable also true radial-engine fighter Probably prime factor good scale model proper airfoil fullsize aircraft cannot easily use full-size airfoil P-SI used high-speed lami nar section sections have used Goodyear models stay away scale unless want bomb land Most symmetrical laminar airfoils much too fast will comfortably adapt scale model wing loading naturally going higher Probably among best used air foils scale models 2400 series 2412 2415 very good scale sections last two numbers refer thickness other words 2412 has 12% thickness highest point lift about 35-40% leading edge percentage under 12% usually too thin retracting gear air craft will need least 14-15% hide wheels wells course may thicken thin leading edge gives model scale look its exceptions bi planes much thinner section may used such 9-10% Keep section thick enough support spars believe scale bipes have built-up wings have foam wings Usually trying simulate fabric-covered wing stab elevator should always symmetrical slab type airfoiled symmetrical wood foam full symmetrical stab much cleaner produces less drag slab type easier build align Both will work OK scale models good safe-size stab 18 20% total wing area total stab elevator course will go aerodynamics scratch-built scale bird later columns 78 Model Aviation Wilkens AMA-size Combat job has 460 sq area loam tips Weighs 18 oz ST 35
Edition: Model Aviation - 1976/01
Page Numbers: 19, 78
Scale WITH THE BIGGEST part 75 con test season about over country Im sure thinking about next season coming winters building time reports what Ive seen Stand-off Scale real biggie past year great interest writer interest WW II contests seem growing coast coast As have stated before seems something fascinating about warbirds WW II fine subjects pick especially WW II types can adapted Stand-off Scale Modelers seem coming up new ones time Birds thought im practical just few years ago AMA scale little modification make good flying Stand-off Scale birds great what Stand-off created Its too bad again AMA scale models Nats drastically down number air planes have around several years no wonder takes 2-3 years build adequately test fly AMA Scale com petitive under rules Its said times before need some rule changes stimulate interest AMA Scale fine Scale Stand-off Scale kits out now lets say dont want build P-51 Spitfire kits Generally scale buffs have particular continued page 78 Helicopters THE COLLECTIVE helicopter presents very different set trimming problems Most collective helicopters operate much higher blade speed fixed machines setting up power curve engine must determined absolutely essential maximum blade pitch reached up side power curve engine also important near constant blade speed achieved Both factors rather diffi cult obtain will require some very pre cise adjusting First need make visual device quickly determine approximately 5/ carburator barrel opening Kavan can done dental mirror held up barrel taking look see accomplish have stop engine has take time may have done numerous times much easier method bolt small aluminum plate about high 1 long behind engine bellcrank can 1/16 thick lesswhatever scrap may have Once bolted place now needs calibrated Turn radio transmitter set collective control motor control full low motor trim full high Now mark plate indicating bellerank position full low speed advance collective full high mark position next retard half collective mark position plate easy mark /s l Gazelle can accomplished calibrating motor pushrod goes through cooling duct Now easy look Bud Atkinson through window see carburator bar rel position motor pushrod should now adjusted el opening occurs transmitter collective control half full motor trim pitch setting should permit helicopter lift off point now determine maximum pitch can achieved up side power curve will have Below Bob Strobels Messerschmitt Me-262 jet stable flies fast Its Supertigre 60 Bottom fiberglass P-38 J E Alexander used home-made molds Own retracts tires lift helicopter off Kavan should least 5000 rpms lift-off Gazelle about 4000 rpms During testing make sure heli copter facing downwind maximum pitch should now adjusted tail-rotor speed remains near constant possible continued page 78 January1976 19 g Flight lines pit areas helicopters yata commonplace sight movement w alt cnoonara Walt considers month qInth getting surely big problem training NEWNEWNEW NEWNEWNEW NEWNEWNEW Custom blended12 Volt Fuel Pump Oper Bill Hagerate 12v starting Sport RC Pylon Racingbattery Economy pump12 Volt Starting Battery 55 blends Castor Klotz oil$1095 Deluxe pump withamp Ideal use blends FAI 700/0leads switch fuel linenew 12v fuel pump nitro$1295any 12v starter $1320 Harrys Hobbies IncPhone 513 276-5898 5224 North Dixie DriveDealer inquiries invitedDayton Ohio 45414 CL Combat continued Englishman Richard Wilkens years Nationals Richard gave Ameri cans treatment made us think about might match up against other British European fliers doubt neither Rich ard nor myself changed minds fliers got chance see things done differently technical scene reported Ron Sheldon Tony Guest coming close making Fox Schnuerle truly competitive engine others throughout country working parallel courses reports over indicate things look promising Supertigre took Tom Uptons advice re designed G21-35BB new Combat Special K&B has introduced new 35 aimed sport market addition 4OBB front-end peripheral jet venturi about fastest out box engine going FAI Combat has another escal FAI Combat has another esca lation horsepower sophistication Die hard British diesel fliers have switched Rossi diesels now keeping up G20 GIS Glow boys switch Rossi glows new kind contest works Southern California Special Pro Combat Association will hold its first contest San Diego December 7th contestants will fly minimum four rounds will invitation Bellcrank artists poor sports full-time line tanglers will invited AMA makes provision such contests offering Class B sanction type contest has tried past worked successfully less 30 entries would like send pictures comments just complaints may reached 3716 Ingraham St San Diego Calif 92109 714 273-6530 RC Helicopters/Schoonard continued page 19 point pet engine will show its ugly face will have tweak needle valve order get enough power under sustained collective setting will heat up start drop off power curve have good powerful engine its power output will crease during increased collective settings trial error process will have em ployed get tail-rotor pitch mix set tings proper start set tail-rotor pitch per manufacturers instructions tail-rotor mix 40-60 percent relationship tail-rotor mix needs adjusted add collective proper tail-rotor pitch added proper time little time spent will very rewarding later turn machine loose will go straight up tail swinging around have achieved will end result up side power curve constant blade speed proper mix relationship have seen lot people heard about lot can control tail rotor revert gyros kinds devices neces sary fact gyro wont help much underpowered out-of-trim helicopter may become too popular making kind statement truth helicopters have demonstrated rapid take-offs rapid de scents rock steady hands-off hovering wind Lately have flying Schluter Heli Baby little marvel flies hands off kinds weatheryes tail will fly hands off am really excited about rugged helicopter couple weeks ago show ing off stalled hit ground really hard about 60 feet bounced end over end like football damage bent output shaft side frames blade hold ers straightened parts replaced main blades flew right off super helicopter learn fly Next months column going deal Goodies Gadgets Such things heli copter Insurance both flight ground other equally exciting subjects column needs pictures creations espe cially incorporates some unique features Please direct correspondence RC Helicopt ers care Walt Schoonard 2080 Sharon Road Winter Park Fla 32789 RC Scale/Atkinson continued page 19 airplane attracted reason another has some fascination An other reason wanting build particular airplane will adapt well RC scale model first consideration powerplant just large want 45 60 pow ered Most Scale AMA Stand-off competition should 60-powered bird course extra detailing retracts used will give much higher wing loading say pattern sport bird Next course ob tain much information possible subject good set three views must make building plans its Stand-off Scale modifications can made insure better flying model changing outline too much aerodynamics involved scratch build ing scale model would make sizeable book may get part later articles best ways draw up scale model use other successful models starting point such good kit scale plans magazines Most standard airplanes ordinarily about same simply continuation other course exceptions Most WW II air craft basically same configuration de pending roles played such fight ers bombers dive-bombers reconnaissance etc over lay Spitfire P-SI ME109 Japanese Tony Macchi 202 would surprised moments would compa rable also true radial-engine fighter Probably prime factor good scale model proper airfoil fullsize aircraft cannot easily use full-size airfoil P-SI used high-speed lami nar section sections have used Goodyear models stay away scale unless want bomb land Most symmetrical laminar airfoils much too fast will comfortably adapt scale model wing loading naturally going higher Probably among best used air foils scale models 2400 series 2412 2415 very good scale sections last two numbers refer thickness other words 2412 has 12% thickness highest point lift about 35-40% leading edge percentage under 12% usually too thin retracting gear air craft will need least 14-15% hide wheels wells course may thicken thin leading edge gives model scale look its exceptions bi planes much thinner section may used such 9-10% Keep section thick enough support spars believe scale bipes have built-up wings have foam wings Usually trying simulate fabric-covered wing stab elevator should always symmetrical slab type airfoiled symmetrical wood foam full symmetrical stab much cleaner produces less drag slab type easier build align Both will work OK scale models good safe-size stab 18 20% total wing area total stab elevator course will go aerodynamics scratch-built scale bird later columns 78 Model Aviation Wilkens AMA-size Combat job has 460 sq area loam tips Weighs 18 oz ST 35