power 0 THERE Richard IS widespread uneasiness among modelers about difference between torque power Most us have come across school definitions torque force applied about lever arm power time rate doing work definitions correct inadequate clarify prac tical meaning terms apply model aircraft propulsion following experience may help clear things up relation between torque power illustrated vividly some time ago driving up hill Blue Ridge Mountains weak clutch began slip ac celerator pressed hard enough maintain speed fourth gear third gear car could maintain speed accelerate slowly Thinking about realized clutch slipped too much twisting force torque applied Yet third gear car could accelerate using less torque engine certain power level needed go uphill given speed Hence evident enough power could delivered wheels Continued page) I. I2 -j w 0 0 0 w 0 8 4 0246810 RPM THOUSANDS 1214 p LL -J w n 0 0 0 w 0 a6 IIII KBiB 35 POWER OS FS-60 - POWER K8iB 35 TORQUE IIII 4 2 6 81012141618 RPM THOUSANDS 64 Model Aviation Torque stand built usan mumn NASA-Goddard MAC uses pendulum measure torque turning prop Twisting air stream directed away motor improve accuracy Power curve prop obtained measuring several combinations torque rpm multiplying III 11-7 PROPELLER q I I 202224 RC gear will determined mainly type power used Since Astro 02 electric-powered version considerably heavier Tee-Dee 020 rearward location radio gear will necessary balance model point shown plan Tee-Deepowered version other hand will require RC gear placed far forward possible perhaps some additional nose ballast may necessary balance ship proper location An excellent set instructions cluded Ace Pulse Commander showing several different types actuator mounting torque rod installations Any could used shown plan has advantage being visible after plane completed feature especially nice scale aircraft Flying Under no circumstances should T-Craft flown until aircraft has balanced location shown plan true model failure could very well spell disaster ship nose-heavy ship could possibly sur vive tail heavy strictly bad news T-Craft models size strictly calm weather airplane authors midwest location means either early morning late evening flying sessions use electric power permits since flying gaspowered aircraft times usually permitted fields Ace Pulse Commander radio supplied very good set instruc tions pulse rudder-only flying tech niques dont see point repeat ing Build model light sturdy follow manufacturers instructions engine RC installation will get hours relaxation enjoy ment T-Craft Power Weber continued page 64 passing less torque rpm through clutch fact torque power related following simple equation Power 000019 x Torque x rpm power horsepower hp torque pound-feet lb ft Look closely equation power product torque rpm fixed engine speed increase torque gives proportional increase power considered other way fixed torque rpm means power comparing two model engines may hear has torque other has power apparent contradiction explained fact rpm considered two engines will different Remem ber specified rpm torque always means power first figure shows power torque curves OS FS-60 4-cycle engine K&B 35cc 21 engine Notice K&B 35 can produce power OS FS-60 both engines operate above 12300 rpm K&B 35 operates above 16000 rpm low speed however OS FS-60 has power torque So read need torque turn large props what writer means need good power low rpm illustrated OS FS-60 Still both engines example run power peaks K&B 35 will fly model faster providing pro peller can matched correctly plane cases such planes large cowls high drag would require gearing down prop Gearing gains torque expense rpm Power delivered prop un changed except small losses gears belt gearing practical OS FS-60 would outperform K&B 35 large props because OS FS-60 has power torque low engine speed second figure shows power torque required turn typical 11-7 propeller different speeds test stand stationary airplane can seen increasing rpm raises power rapidly torque cause prop power again January1979 111 Please send me.......... copies new fourth edition Radio Control Buyers Guide Enclosed $600 copy ordered $525 Guide plus $75 postage & handling Total Enclosed ___________ anada City State ZIP Return Boynton & Assoc Clifton House Clifton VA 22024 FULL-SIZE PLAf __________ No 244Spirit Springs$250 RC Sport Racer REM 09 15 doubles V4 Midget No 245Whip Control Eagle$150 CL Profile F-15 fighter easy build fun fly No 246T-Craft$250 RC Nice flying pulse-rudder scale 02 electric No 247Wright Flyer$300 Authentic plans Harry Robinson real plane No 103Kloud King 15- 19 AC Old-Timer Free Flight based upon 1938 record breaker FFS400 No 104Wiley Post Biplane Petite durable scale design either rubber tail wagger Ipulserudder $225 No118GollyGeeWhiz Dan Rutherfords simple Half-A powered Combat iob turns dimeSiSO No 121Gremlin Sturdy aerobatic RC biplane flies well 35s up 60s $300 No 1234-Bits 40-powered AC 500 Club Aacer has winning ways Good sport too$400 No124Semi-Pro Contest-winning HLglider has pop-up tail dethermalizer No125HaIf-Korda rubber John Oldenkamps 1/2-size all-balsa Old-Timer $175 No 131Gee Bee Model Y 40-powered AC stand-off scale great old-time racers $500 No 134Calliato superb Standard Class AC sailplane also took Hats first -$400 No 136Fieseler Storch AC scale model 23-45 5-channel has both slots flaps $400 No 146QuickSilver AC 1/2A Pylon Racer incorporates latest techniques$200 No 149Comedian AC fun-fly aerobatic biplane good looker 40 60$400 No 155Tellipsoer AC Standard Class sailplane wins stand-out performance -$1000 No159Tercel Keith Trostles 1/2A CL Stunt ship flies excellent pattern -$200 No 165Midget Mustang CL 1975-1976 Nats winning Goodyear John Ballard -$200 No 166Nothing Fancy AC biplane 35 engines pretty handles beautifully$825 No 168Simitar AC spectacular flying wing 15 nose-mounted tractor$300 No169Dennyplane AC version famed cabin model kit 1937 19-25$400 No 177Zonker AC canard has pattern capability 40 power .. $300 No 118Country Boy FFbyiimClemisthoroughbred/09/51 1/2A $300 No 181Bed Check Charlie AC Scale model Russian PT trainer 09/15$300 No183TheAnawer ACandFFcabinisO2sizedforReplicaOld-Timer$175 No 184Seville AC Sport low-wing sailplane 180 wing has excellent performance $350 No 189Vintage 11 AC Antique type old-time open fuse construction 60$475 No 192Chipmunk AC Scale winner 1978 World Championships Nets No 193Stiletto CL stunt model lMcoonald winner 1976 FAI World Champs -$375 No 194Vol Libre FF rubber-powered Wakefield Bob White Great winner$275 No 195Hats Biplane AC aerobatic scale iob takes 40/50 built-in muffler . $475 No 198Sportater AC deBolt wing choice aerobatics/racing$376 No203Fokker 0-VIII AC 45 60 Two sheets 2-1/2 scale$900 No 205Hot Rock AC aerobatics 19-40 engines Simple tail-dragger$350 No 206Air Camper FF Pientenpol 1/2A Charming old-timer 2-sheets$300 No 207Uvesey DL 5 AC English homebuilt 3-chan. 15s Exotic easy Good flier$500 No 212Miss America AC Antique famous historic model 2 big sheets 35 40$925 No 213Eliminator II CL Class Speed asymmetric design record iob$175 No 215Windlord Ken Bates AC flying wing sailplane highly competitive$550 No216Mustang Al Meyers lovely CL P-Si 35 46 Sport Scale Stunt$400 No217Rocketeer Al Lidbergs 02 FF replica famed Schoenbrun old-timer$200 No218AC Fairchild Ranger 24 AMA Sport Scale 2 big sheets$1000 No 219FF Fokicer Universal Jumbo-sized rubber scale model Bill Noonan$500 No 220CL Bobcat John Kilsdonks Slow Ratlatest state art$150 No 221AC lnader indoorsand out Electric power pulse rudder$300 No 222Winterhawk AC standard class sailplane rugged excellent soarer$350 No223Fly Baby CL Scale model Pete Bowers homebuiltfor 35-40 AC engine$375 No224Horsefly AC sport ob Ace pulse rudderless $100 radio$250 No 225Ole Reliable AC 70 version 38 oldtimer REM controls 19-25$425 No 226Spitfire CL profile 2 versionsbuilt-up solid stunter 35$450 No 227AG-i Agrivation AC 4-chan. 25-40 realistic trike gear low wing$400 No 228Fighters Two CL 1/2A balsa profiles Japanese Nate us P-26 Peashooter$200 No 229The Solution AC competitive pattern deBolt 40 power$475 No 230AA-25 AC tiny high performance sailplane 2 channelswinglets$275 No 232Ms Peach Embryo rubber endurance Bill Warner Nets winner$150 No 233Sport 40 AC 4-chan trike-gear shoulder-wing 40$425 No 234Typhoon CL profile 15 WW II fighter Paul Scheaf$300 No 235Mentor FF Very nice 40 towliner small fields$300 No 236Dasher AC combo racing pattern characteristics 15 25$300 No237Stits Jr CL worlds smallest plane good flier 25 35$300 No238Wildcat AC Ace pulse rudder 02 Grumman fighter Bowers Srull$175 No 239Blue Birds AC Ken Willards formation plane 4-ch. 10$375 No 240Misfit AC Classy shoulder wing sport 4 ch. 15 power$400 No 241Ace-Dart AC Scale-up Ehling Dart Pulse rudder Pee Wee 02$175 No 242Dakota FF Scale-up famous Dakota bipe great sport 0496275 No 243Super Burp CL Aecord iet speed model 1/2 size plan details full$150 [v32][b-2-10-1-10]] Circle numbers plans wish order 118121123124125 159165166168169 193194195198 216217218 227228229 238239240 103 131134136146149 177178181183184 203205206207212 104 155 189 213 219220221222223224225 230231232233234235236 241242243244245246247 Enclosed ______________________ NAME STREET CITY STATE 71 P Price includes first-class postage Send check money order payable Mode/Aviation AMA 815 Fifteenth St. NW Washington DC 20005 [v32][b-2-10-1-10]] product torque rpm 13800 rpm about top speed 11-7 Schnuerle 60 engine supplying power 16 hp torque 061 lb ft After plane flying prop unloads engine speeds up until engine power available once again equals power absorbed prop summarize propeller turned torque Power measure both torque rpm supplied prop engine Power fundamental drive moves airplane power flies faster power transferred efficiently air thrust ADVERTISERS INDEX Ace Radio Control96 Andrews Aircraft Model Co99 Richard C Barron104 Coverite5 Cox Hobbies Inc ide Front Cover DGM Industries106 Du-Bro Products107 EK-Products7 Fireball Glow Plugs98 Flyline Models104 Four Js Enterprises102 Fourmost Racing Products100 Fox Mfg Company7 Carl Goldberg Models Inside Back Cover Grish Brothers109 Hobbypoxy93 International Modeler ShowIMS K&B Mfg Company95 97 Kustom Kraftsmanship106 Midwest Model Products6 Model & Allied Publications66 Modernistic Models108 Morrison Repla-Tech108 Peck-Polymers106 Pica Enterprises66 94 96 Progress Mfg Company8 Proctor Ent Corp108 R/C Buyers Guide111 Sig Mfg Company1 Sterling Models Inc9 Sullivan Products Inc105 Tatone Products Inc9 Top Flite Models Inc3 Westport International Inc101 Williams Brothers103 World EnginesBack Cover 112 Model Aviation 192 215 226 237 Please print carefully Full-Size Plan List Available complete listing plans pre viously published mag azine through No 235 may obtained free charge writing enclose stamped self-addressed business-size envelope Model Aviation 815 15th St NW Washington DC 20005
Edition: Model Aviation - 1979/01
Page Numbers: 64, 111, 112
power 0 THERE Richard IS widespread uneasiness among modelers about difference between torque power Most us have come across school definitions torque force applied about lever arm power time rate doing work definitions correct inadequate clarify prac tical meaning terms apply model aircraft propulsion following experience may help clear things up relation between torque power illustrated vividly some time ago driving up hill Blue Ridge Mountains weak clutch began slip ac celerator pressed hard enough maintain speed fourth gear third gear car could maintain speed accelerate slowly Thinking about realized clutch slipped too much twisting force torque applied Yet third gear car could accelerate using less torque engine certain power level needed go uphill given speed Hence evident enough power could delivered wheels Continued page) I. I2 -j w 0 0 0 w 0 8 4 0246810 RPM THOUSANDS 1214 p LL -J w n 0 0 0 w 0 a6 IIII KBiB 35 POWER OS FS-60 - POWER K8iB 35 TORQUE IIII 4 2 6 81012141618 RPM THOUSANDS 64 Model Aviation Torque stand built usan mumn NASA-Goddard MAC uses pendulum measure torque turning prop Twisting air stream directed away motor improve accuracy Power curve prop obtained measuring several combinations torque rpm multiplying III 11-7 PROPELLER q I I 202224 RC gear will determined mainly type power used Since Astro 02 electric-powered version considerably heavier Tee-Dee 020 rearward location radio gear will necessary balance model point shown plan Tee-Deepowered version other hand will require RC gear placed far forward possible perhaps some additional nose ballast may necessary balance ship proper location An excellent set instructions cluded Ace Pulse Commander showing several different types actuator mounting torque rod installations Any could used shown plan has advantage being visible after plane completed feature especially nice scale aircraft Flying Under no circumstances should T-Craft flown until aircraft has balanced location shown plan true model failure could very well spell disaster ship nose-heavy ship could possibly sur vive tail heavy strictly bad news T-Craft models size strictly calm weather airplane authors midwest location means either early morning late evening flying sessions use electric power permits since flying gaspowered aircraft times usually permitted fields Ace Pulse Commander radio supplied very good set instruc tions pulse rudder-only flying tech niques dont see point repeat ing Build model light sturdy follow manufacturers instructions engine RC installation will get hours relaxation enjoy ment T-Craft Power Weber continued page 64 passing less torque rpm through clutch fact torque power related following simple equation Power 000019 x Torque x rpm power horsepower hp torque pound-feet lb ft Look closely equation power product torque rpm fixed engine speed increase torque gives proportional increase power considered other way fixed torque rpm means power comparing two model engines may hear has torque other has power apparent contradiction explained fact rpm considered two engines will different Remem ber specified rpm torque always means power first figure shows power torque curves OS FS-60 4-cycle engine K&B 35cc 21 engine Notice K&B 35 can produce power OS FS-60 both engines operate above 12300 rpm K&B 35 operates above 16000 rpm low speed however OS FS-60 has power torque So read need torque turn large props what writer means need good power low rpm illustrated OS FS-60 Still both engines example run power peaks K&B 35 will fly model faster providing pro peller can matched correctly plane cases such planes large cowls high drag would require gearing down prop Gearing gains torque expense rpm Power delivered prop un changed except small losses gears belt gearing practical OS FS-60 would outperform K&B 35 large props because OS FS-60 has power torque low engine speed second figure shows power torque required turn typical 11-7 propeller different speeds test stand stationary airplane can seen increasing rpm raises power rapidly torque cause prop power again January1979 111 Please send me.......... copies new fourth edition Radio Control Buyers Guide Enclosed $600 copy ordered $525 Guide plus $75 postage & handling Total Enclosed ___________ anada City State ZIP Return Boynton & Assoc Clifton House Clifton VA 22024 FULL-SIZE PLAf __________ No 244Spirit Springs$250 RC Sport Racer REM 09 15 doubles V4 Midget No 245Whip Control Eagle$150 CL Profile F-15 fighter easy build fun fly No 246T-Craft$250 RC Nice flying pulse-rudder scale 02 electric No 247Wright Flyer$300 Authentic plans Harry Robinson real plane No 103Kloud King 15- 19 AC Old-Timer Free Flight based upon 1938 record breaker FFS400 No 104Wiley Post Biplane Petite durable scale design either rubber tail wagger Ipulserudder $225 No118GollyGeeWhiz Dan Rutherfords simple Half-A powered Combat iob turns dimeSiSO No 121Gremlin Sturdy aerobatic RC biplane flies well 35s up 60s $300 No 1234-Bits 40-powered AC 500 Club Aacer has winning ways Good sport too$400 No124Semi-Pro Contest-winning HLglider has pop-up tail dethermalizer No125HaIf-Korda rubber John Oldenkamps 1/2-size all-balsa Old-Timer $175 No 131Gee Bee Model Y 40-powered AC stand-off scale great old-time racers $500 No 134Calliato superb Standard Class AC sailplane also took Hats first -$400 No 136Fieseler Storch AC scale model 23-45 5-channel has both slots flaps $400 No 146QuickSilver AC 1/2A Pylon Racer incorporates latest techniques$200 No 149Comedian AC fun-fly aerobatic biplane good looker 40 60$400 No 155Tellipsoer AC Standard Class sailplane wins stand-out performance -$1000 No159Tercel Keith Trostles 1/2A CL Stunt ship flies excellent pattern -$200 No 165Midget Mustang CL 1975-1976 Nats winning Goodyear John Ballard -$200 No 166Nothing Fancy AC biplane 35 engines pretty handles beautifully$825 No 168Simitar AC spectacular flying wing 15 nose-mounted tractor$300 No169Dennyplane AC version famed cabin model kit 1937 19-25$400 No 177Zonker AC canard has pattern capability 40 power .. $300 No 118Country Boy FFbyiimClemisthoroughbred/09/51 1/2A $300 No 181Bed Check Charlie AC Scale model Russian PT trainer 09/15$300 No183TheAnawer ACandFFcabinisO2sizedforReplicaOld-Timer$175 No 184Seville AC Sport low-wing sailplane 180 wing has excellent performance $350 No 189Vintage 11 AC Antique type old-time open fuse construction 60$475 No 192Chipmunk AC Scale winner 1978 World Championships Nets No 193Stiletto CL stunt model lMcoonald winner 1976 FAI World Champs -$375 No 194Vol Libre FF rubber-powered Wakefield Bob White Great winner$275 No 195Hats Biplane AC aerobatic scale iob takes 40/50 built-in muffler . $475 No 198Sportater AC deBolt wing choice aerobatics/racing$376 No203Fokker 0-VIII AC 45 60 Two sheets 2-1/2 scale$900 No 205Hot Rock AC aerobatics 19-40 engines Simple tail-dragger$350 No 206Air Camper FF Pientenpol 1/2A Charming old-timer 2-sheets$300 No 207Uvesey DL 5 AC English homebuilt 3-chan. 15s Exotic easy Good flier$500 No 212Miss America AC Antique famous historic model 2 big sheets 35 40$925 No 213Eliminator II CL Class Speed asymmetric design record iob$175 No 215Windlord Ken Bates AC flying wing sailplane highly competitive$550 No216Mustang Al Meyers lovely CL P-Si 35 46 Sport Scale Stunt$400 No217Rocketeer Al Lidbergs 02 FF replica famed Schoenbrun old-timer$200 No218AC Fairchild Ranger 24 AMA Sport Scale 2 big sheets$1000 No 219FF Fokicer Universal Jumbo-sized rubber scale model Bill Noonan$500 No 220CL Bobcat John Kilsdonks Slow Ratlatest state art$150 No 221AC lnader indoorsand out Electric power pulse rudder$300 No 222Winterhawk AC standard class sailplane rugged excellent soarer$350 No223Fly Baby CL Scale model Pete Bowers homebuiltfor 35-40 AC engine$375 No224Horsefly AC sport ob Ace pulse rudderless $100 radio$250 No 225Ole Reliable AC 70 version 38 oldtimer REM controls 19-25$425 No 226Spitfire CL profile 2 versionsbuilt-up solid stunter 35$450 No 227AG-i Agrivation AC 4-chan. 25-40 realistic trike gear low wing$400 No 228Fighters Two CL 1/2A balsa profiles Japanese Nate us P-26 Peashooter$200 No 229The Solution AC competitive pattern deBolt 40 power$475 No 230AA-25 AC tiny high performance sailplane 2 channelswinglets$275 No 232Ms Peach Embryo rubber endurance Bill Warner Nets winner$150 No 233Sport 40 AC 4-chan trike-gear shoulder-wing 40$425 No 234Typhoon CL profile 15 WW II fighter Paul Scheaf$300 No 235Mentor FF Very nice 40 towliner small fields$300 No 236Dasher AC combo racing pattern characteristics 15 25$300 No237Stits Jr CL worlds smallest plane good flier 25 35$300 No238Wildcat AC Ace pulse rudder 02 Grumman fighter Bowers Srull$175 No 239Blue Birds AC Ken Willards formation plane 4-ch. 10$375 No 240Misfit AC Classy shoulder wing sport 4 ch. 15 power$400 No 241Ace-Dart AC Scale-up Ehling Dart Pulse rudder Pee Wee 02$175 No 242Dakota FF Scale-up famous Dakota bipe great sport 0496275 No 243Super Burp CL Aecord iet speed model 1/2 size plan details full$150 [v32][b-2-10-1-10]] Circle numbers plans wish order 118121123124125 159165166168169 193194195198 216217218 227228229 238239240 103 131134136146149 177178181183184 203205206207212 104 155 189 213 219220221222223224225 230231232233234235236 241242243244245246247 Enclosed ______________________ NAME STREET CITY STATE 71 P Price includes first-class postage Send check money order payable Mode/Aviation AMA 815 Fifteenth St. NW Washington DC 20005 [v32][b-2-10-1-10]] product torque rpm 13800 rpm about top speed 11-7 Schnuerle 60 engine supplying power 16 hp torque 061 lb ft After plane flying prop unloads engine speeds up until engine power available once again equals power absorbed prop summarize propeller turned torque Power measure both torque rpm supplied prop engine Power fundamental drive moves airplane power flies faster power transferred efficiently air thrust ADVERTISERS INDEX Ace Radio Control96 Andrews Aircraft Model Co99 Richard C Barron104 Coverite5 Cox Hobbies Inc ide Front Cover DGM Industries106 Du-Bro Products107 EK-Products7 Fireball Glow Plugs98 Flyline Models104 Four Js Enterprises102 Fourmost Racing Products100 Fox Mfg Company7 Carl Goldberg Models Inside Back Cover Grish Brothers109 Hobbypoxy93 International Modeler ShowIMS K&B Mfg Company95 97 Kustom Kraftsmanship106 Midwest Model Products6 Model & Allied Publications66 Modernistic Models108 Morrison Repla-Tech108 Peck-Polymers106 Pica Enterprises66 94 96 Progress Mfg Company8 Proctor Ent Corp108 R/C Buyers Guide111 Sig Mfg Company1 Sterling Models Inc9 Sullivan Products Inc105 Tatone Products Inc9 Top Flite Models Inc3 Westport International Inc101 Williams Brothers103 World EnginesBack Cover 112 Model Aviation 192 215 226 237 Please print carefully Full-Size Plan List Available complete listing plans pre viously published mag azine through No 235 may obtained free charge writing enclose stamped self-addressed business-size envelope Model Aviation 815 15th St NW Washington DC 20005
Edition: Model Aviation - 1979/01
Page Numbers: 64, 111, 112
power 0 THERE Richard IS widespread uneasiness among modelers about difference between torque power Most us have come across school definitions torque force applied about lever arm power time rate doing work definitions correct inadequate clarify prac tical meaning terms apply model aircraft propulsion following experience may help clear things up relation between torque power illustrated vividly some time ago driving up hill Blue Ridge Mountains weak clutch began slip ac celerator pressed hard enough maintain speed fourth gear third gear car could maintain speed accelerate slowly Thinking about realized clutch slipped too much twisting force torque applied Yet third gear car could accelerate using less torque engine certain power level needed go uphill given speed Hence evident enough power could delivered wheels Continued page) I. I2 -j w 0 0 0 w 0 8 4 0246810 RPM THOUSANDS 1214 p LL -J w n 0 0 0 w 0 a6 IIII KBiB 35 POWER OS FS-60 - POWER K8iB 35 TORQUE IIII 4 2 6 81012141618 RPM THOUSANDS 64 Model Aviation Torque stand built usan mumn NASA-Goddard MAC uses pendulum measure torque turning prop Twisting air stream directed away motor improve accuracy Power curve prop obtained measuring several combinations torque rpm multiplying III 11-7 PROPELLER q I I 202224 RC gear will determined mainly type power used Since Astro 02 electric-powered version considerably heavier Tee-Dee 020 rearward location radio gear will necessary balance model point shown plan Tee-Deepowered version other hand will require RC gear placed far forward possible perhaps some additional nose ballast may necessary balance ship proper location An excellent set instructions cluded Ace Pulse Commander showing several different types actuator mounting torque rod installations Any could used shown plan has advantage being visible after plane completed feature especially nice scale aircraft Flying Under no circumstances should T-Craft flown until aircraft has balanced location shown plan true model failure could very well spell disaster ship nose-heavy ship could possibly sur vive tail heavy strictly bad news T-Craft models size strictly calm weather airplane authors midwest location means either early morning late evening flying sessions use electric power permits since flying gaspowered aircraft times usually permitted fields Ace Pulse Commander radio supplied very good set instruc tions pulse rudder-only flying tech niques dont see point repeat ing Build model light sturdy follow manufacturers instructions engine RC installation will get hours relaxation enjoy ment T-Craft Power Weber continued page 64 passing less torque rpm through clutch fact torque power related following simple equation Power 000019 x Torque x rpm power horsepower hp torque pound-feet lb ft Look closely equation power product torque rpm fixed engine speed increase torque gives proportional increase power considered other way fixed torque rpm means power comparing two model engines may hear has torque other has power apparent contradiction explained fact rpm considered two engines will different Remem ber specified rpm torque always means power first figure shows power torque curves OS FS-60 4-cycle engine K&B 35cc 21 engine Notice K&B 35 can produce power OS FS-60 both engines operate above 12300 rpm K&B 35 operates above 16000 rpm low speed however OS FS-60 has power torque So read need torque turn large props what writer means need good power low rpm illustrated OS FS-60 Still both engines example run power peaks K&B 35 will fly model faster providing pro peller can matched correctly plane cases such planes large cowls high drag would require gearing down prop Gearing gains torque expense rpm Power delivered prop un changed except small losses gears belt gearing practical OS FS-60 would outperform K&B 35 large props because OS FS-60 has power torque low engine speed second figure shows power torque required turn typical 11-7 propeller different speeds test stand stationary airplane can seen increasing rpm raises power rapidly torque cause prop power again January1979 111 Please send me.......... copies new fourth edition Radio Control Buyers Guide Enclosed $600 copy ordered $525 Guide plus $75 postage & handling Total Enclosed ___________ anada City State ZIP Return Boynton & Assoc Clifton House Clifton VA 22024 FULL-SIZE PLAf __________ No 244Spirit Springs$250 RC Sport Racer REM 09 15 doubles V4 Midget No 245Whip Control Eagle$150 CL Profile F-15 fighter easy build fun fly No 246T-Craft$250 RC Nice flying pulse-rudder scale 02 electric No 247Wright Flyer$300 Authentic plans Harry Robinson real plane No 103Kloud King 15- 19 AC Old-Timer Free Flight based upon 1938 record breaker FFS400 No 104Wiley Post Biplane Petite durable scale design either rubber tail wagger Ipulserudder $225 No118GollyGeeWhiz Dan Rutherfords simple Half-A powered Combat iob turns dimeSiSO No 121Gremlin Sturdy aerobatic RC biplane flies well 35s up 60s $300 No 1234-Bits 40-powered AC 500 Club Aacer has winning ways Good sport too$400 No124Semi-Pro Contest-winning HLglider has pop-up tail dethermalizer No125HaIf-Korda rubber John Oldenkamps 1/2-size all-balsa Old-Timer $175 No 131Gee Bee Model Y 40-powered AC stand-off scale great old-time racers $500 No 134Calliato superb Standard Class AC sailplane also took Hats first -$400 No 136Fieseler Storch AC scale model 23-45 5-channel has both slots flaps $400 No 146QuickSilver AC 1/2A Pylon Racer incorporates latest techniques$200 No 149Comedian AC fun-fly aerobatic biplane good looker 40 60$400 No 155Tellipsoer AC Standard Class sailplane wins stand-out performance -$1000 No159Tercel Keith Trostles 1/2A CL Stunt ship flies excellent pattern -$200 No 165Midget Mustang CL 1975-1976 Nats winning Goodyear John Ballard -$200 No 166Nothing Fancy AC biplane 35 engines pretty handles beautifully$825 No 168Simitar AC spectacular flying wing 15 nose-mounted tractor$300 No169Dennyplane AC version famed cabin model kit 1937 19-25$400 No 177Zonker AC canard has pattern capability 40 power .. $300 No 118Country Boy FFbyiimClemisthoroughbred/09/51 1/2A $300 No 181Bed Check Charlie AC Scale model Russian PT trainer 09/15$300 No183TheAnawer ACandFFcabinisO2sizedforReplicaOld-Timer$175 No 184Seville AC Sport low-wing sailplane 180 wing has excellent performance $350 No 189Vintage 11 AC Antique type old-time open fuse construction 60$475 No 192Chipmunk AC Scale winner 1978 World Championships Nets No 193Stiletto CL stunt model lMcoonald winner 1976 FAI World Champs -$375 No 194Vol Libre FF rubber-powered Wakefield Bob White Great winner$275 No 195Hats Biplane AC aerobatic scale iob takes 40/50 built-in muffler . $475 No 198Sportater AC deBolt wing choice aerobatics/racing$376 No203Fokker 0-VIII AC 45 60 Two sheets 2-1/2 scale$900 No 205Hot Rock AC aerobatics 19-40 engines Simple tail-dragger$350 No 206Air Camper FF Pientenpol 1/2A Charming old-timer 2-sheets$300 No 207Uvesey DL 5 AC English homebuilt 3-chan. 15s Exotic easy Good flier$500 No 212Miss America AC Antique famous historic model 2 big sheets 35 40$925 No 213Eliminator II CL Class Speed asymmetric design record iob$175 No 215Windlord Ken Bates AC flying wing sailplane highly competitive$550 No216Mustang Al Meyers lovely CL P-Si 35 46 Sport Scale Stunt$400 No217Rocketeer Al Lidbergs 02 FF replica famed Schoenbrun old-timer$200 No218AC Fairchild Ranger 24 AMA Sport Scale 2 big sheets$1000 No 219FF Fokicer Universal Jumbo-sized rubber scale model Bill Noonan$500 No 220CL Bobcat John Kilsdonks Slow Ratlatest state art$150 No 221AC lnader indoorsand out Electric power pulse rudder$300 No 222Winterhawk AC standard class sailplane rugged excellent soarer$350 No223Fly Baby CL Scale model Pete Bowers homebuiltfor 35-40 AC engine$375 No224Horsefly AC sport ob Ace pulse rudderless $100 radio$250 No 225Ole Reliable AC 70 version 38 oldtimer REM controls 19-25$425 No 226Spitfire CL profile 2 versionsbuilt-up solid stunter 35$450 No 227AG-i Agrivation AC 4-chan. 25-40 realistic trike gear low wing$400 No 228Fighters Two CL 1/2A balsa profiles Japanese Nate us P-26 Peashooter$200 No 229The Solution AC competitive pattern deBolt 40 power$475 No 230AA-25 AC tiny high performance sailplane 2 channelswinglets$275 No 232Ms Peach Embryo rubber endurance Bill Warner Nets winner$150 No 233Sport 40 AC 4-chan trike-gear shoulder-wing 40$425 No 234Typhoon CL profile 15 WW II fighter Paul Scheaf$300 No 235Mentor FF Very nice 40 towliner small fields$300 No 236Dasher AC combo racing pattern characteristics 15 25$300 No237Stits Jr CL worlds smallest plane good flier 25 35$300 No238Wildcat AC Ace pulse rudder 02 Grumman fighter Bowers Srull$175 No 239Blue Birds AC Ken Willards formation plane 4-ch. 10$375 No 240Misfit AC Classy shoulder wing sport 4 ch. 15 power$400 No 241Ace-Dart AC Scale-up Ehling Dart Pulse rudder Pee Wee 02$175 No 242Dakota FF Scale-up famous Dakota bipe great sport 0496275 No 243Super Burp CL Aecord iet speed model 1/2 size plan details full$150 [v32][b-2-10-1-10]] Circle numbers plans wish order 118121123124125 159165166168169 193194195198 216217218 227228229 238239240 103 131134136146149 177178181183184 203205206207212 104 155 189 213 219220221222223224225 230231232233234235236 241242243244245246247 Enclosed ______________________ NAME STREET CITY STATE 71 P Price includes first-class postage Send check money order payable Mode/Aviation AMA 815 Fifteenth St. NW Washington DC 20005 [v32][b-2-10-1-10]] product torque rpm 13800 rpm about top speed 11-7 Schnuerle 60 engine supplying power 16 hp torque 061 lb ft After plane flying prop unloads engine speeds up until engine power available once again equals power absorbed prop summarize propeller turned torque Power measure both torque rpm supplied prop engine Power fundamental drive moves airplane power flies faster power transferred efficiently air thrust ADVERTISERS INDEX Ace Radio Control96 Andrews Aircraft Model Co99 Richard C Barron104 Coverite5 Cox Hobbies Inc ide Front Cover DGM Industries106 Du-Bro Products107 EK-Products7 Fireball Glow Plugs98 Flyline Models104 Four Js Enterprises102 Fourmost Racing Products100 Fox Mfg Company7 Carl Goldberg Models Inside Back Cover Grish Brothers109 Hobbypoxy93 International Modeler ShowIMS K&B Mfg Company95 97 Kustom Kraftsmanship106 Midwest Model Products6 Model & Allied Publications66 Modernistic Models108 Morrison Repla-Tech108 Peck-Polymers106 Pica Enterprises66 94 96 Progress Mfg Company8 Proctor Ent Corp108 R/C Buyers Guide111 Sig Mfg Company1 Sterling Models Inc9 Sullivan Products Inc105 Tatone Products Inc9 Top Flite Models Inc3 Westport International Inc101 Williams Brothers103 World EnginesBack Cover 112 Model Aviation 192 215 226 237 Please print carefully Full-Size Plan List Available complete listing plans pre viously published mag azine through No 235 may obtained free charge writing enclose stamped self-addressed business-size envelope Model Aviation 815 15th St NW Washington DC 20005