Free Flight Twin Props Ever hankerin build rubber-power Twin Bonanza. B-26 Awhile back Fulton Hungerford entered Ford Trimotor Indoor Scale Rubber-Power event Nats wing-mounted props driven rubber motors ran through wing driving props through coil springs served flexible shafts flew early thirties Mamco marketed system driving two wing-mounted props two rubber motors fuselage gear box rear fuselage driven rubber motors transmitted power two music-wire shafts con nected props gearbox didnt use gears used cranks con necting rods same purpose So nothing new Recently two foreign manufacturers have introduced kits twin-engine rub ber-power models Peerless Corp imports Japanese-made Turbo Com mander 690 24-in wingspan Airfix Industries England produces based Fokker Friendship Peerless model uses foam surfaces printed sheet balsa fuselage parts Airfix model all-plastic ready fly Both use single rubber motor fuselage drive gearbox rear wire shafts driven spur gears lace through fuselage wing engine nacelles wing havent seen Airfix model hobby shop shelves local hobby emporium sells Peerless model bit over $10 Worth it. nds relate flying toys competition/sport free-flight nutto column writtenperhaps opens some doors Yep could build such device yourself two could use kit gear box units stick-and-tissue creation own Whether gear drive unit worth price kit depends adept making things like what time worth Buy six units first kid block rubber-power Domier DO-X Book Review Man Powered Flight Keith Sherwin Model Allied Publica tions England What review book about manpowered flight doing Free Flight col umn Well surely isnt RC CL just think People-Powered Free Flight ok edition reviewed Revised Re print 1975 contains material presented original 1971 edition plus added chapters tables covering devel opments last five years havent paying close atten tion fascinating branch sport aviation might come shock learn Duralion cIIO first successful man-powered flightincluding pedal-powered take-off took place over 14 years ago hund reds man-powered flights have accomplished flights up 8/10 mile have achieved termi nated because ran out airport over dozen quite successful man-powered machines have built big question think free-fighter knows its bit hard explain enjoy challenge doing things hard way Bob Meuser Mamco transmission early 30s left stalled rear two rubber motors two musicwire propeller shafts Plc Meuser Below Another twin ready-to-fly Friendship Airfix England Cutaway show propellerdrive mechanism Note tubing over shafts just because challenge Certainly building overgrown stick-and-tissue model plane pedaling through air must difficult way getting Point Point B yet devised mind man book lays out starting predic tably history gliding flight semi-successful pedal-power attempts mid-thirties leading modern efforts sixties seventies Rather complete descriptions var ious pedal-power craft given including 44 Model Aviation Top Imported Peerless 24 Turbo Com mander rubber foam/balsa has flexi ble shafts driven gear box rear fuselage photos drawings short chapter titled Man Power author discusses pros cons pedaling hand cranking rowing com binations presents curves horsepower vs duration turns out athelete can put out about horse power minute half horsepower 100 minutes horse think Id resent Three chapters aerodynamics performance cover fundamentals particular emphasis peculiarities low-speed aerodynamics short chapter Design Studies gives power-requirement calculations four different aircraft graph showing ground effect reduces power requirements aircraft differ ent spans aspect ratios flight altitude chapter drive propulsion dwells considerably mechanical arrangements details leaving few pages complex subject propeller aerody namics considering problem presentation masterfully done follows short chapter Mate ials Construction covering structural mechanics comparisons applications various materials selected problems considerable detail Upon successfully completing chapter reader endowed BS degree Structural Mechanics and E license comes chapter Control cov ering both theoretical practical aspects Consider problem pedaling guts out previous flying experience inapplic able thing supposed fly designed committee grad students made tail too smallany free fighter can see feet unavail able control functions having assigned Propulsion Department handswhich 90% com mitted hanging dear lifeyou supposed fly silly thing straight level chapter titled Uncoventional Aircraft talks lot about ornithopters helicop ters tries convince weirdies rest book about really quite conventional An added 11-page chapter latest developments winds up main text extensive list referencesadded 1975 editionserves finishing touch Signs times original edition hardbound cloth contained 176 pages sold 175 1975 edition paperback 16 pages longer sells 295 about $6 real money contemplating building people-power plane better buy book Sig says has no plans marketing kit foreseeable future Zero-Pitch Prop Last Remem ber article American Aircraft Mod eler about zero-displacement engine Ill bet lot thought tongue-incheek fun-and-games stuff took pretty seriously myself authors thesis since power-to-displacement ratio known increase displacement de creases lets just decrease displacement zeroby using zero strokeand power should infinite least very large something like What author failed point out however infinite shaft speed would required Any fool could see saw right off catch problem matching prop conditions must have right P/D optimum P/D more-or-less proportional J Now J simply v/nD v forward speed n shaft RPM D prop dia meter Now clearly v cannot infinite mean lets realistic Therefore ob vious optimum value J infinite value n zero follows optimum P/D zero Now thats just great Ive thumbed through catalogues until big toes raw trying find stock over-the-counter zero-pitch prop naught simply dont exist Trans-World Airlines rescue TWA has actually bunch zero-pitch props manufactured giving away free ask ing customers P/R types go muck up bit Since 1976 TWA s semiBelow Next time fly TWA ask stewardperson zero-pitch props Its just thing use zero-stroke engine centennialor penta-deci-centennial preferthey went put big raised letters TWA face blade 1926/1976 other increased aerodynamic efficiency sug gest simply sandpaper letter ing off Remember 1926 Back TWA stood Transcontinental Western Airlines Sounds like name railroad Considering speed planes flew days fig ures Next time fly TWA ask stew ardperson dont have zero-displacement engine put can always use swizzle stick Unofficial Events few continuing saga flown NASA Ames Research Lab meet youngsters anything rubber powered will fit 18-inch cube Thermal Thumbers Southern Cal have proposed one-design outdoor rubber-power event Gollywoks Willamette Model ers Club Oregon has planned indoor event rubber-power scaled-down ver sions pre-1942 Gas models 24-in max span tissue covered ROG landing gear may longer scale Erv Rodemsky has proposed half-size Pennyplane event 9-in max span length 5-in max moterstick length Suggestions onedesign gas-power events pop up frequently dont know have actually taken place Cox Baby Bee Starduster 350 perhaps Indoor towline glider other pops up five years latest such event flown Oakland Cloud Dusters rulethe covering conventional Japanesetype tissue AMA-Gas events flown according 1975 AMA rules some Southern Cal meets Are have missed know please drop line eh Oh-Too Oh-Tee Lives back mentioned Bob Oslanhead man down continued page 84 Now available three sizes cover full range FF sizes K & W Stop-a-Prop brakes Used 1 Oloffson win 1975 World Champs August1976 45 Man Powered Flight extensively reviewed product MAP produces eramodeller etc sells $6 comprehensive Cal-Aero Models dropping out 01 020-Old-Timer kit business pleased learn kits formerly made Cal-Aero now being manufac tured J R Models 5021 W Sheri dan Phoenix AZ 85035 underscore fact celebrate 200th anni versary great nation J R will sponsor 1976 Ri-Centennial 020 Powered Free-Flight Replica Postal Con test separate categories ATTENTION NATIONALS CONTESTANTS Fly FOX products 1976 Nationals win CASH AWARD addition trophy $200 cash 1st place events Combat r Open CL Stunt r Open RC Pattern s D RC Quarter Midget $100 cash 1st place other event Requirements win using Fox engine fuel plug Procedure een 5 PM 10 PM bring winning model trophy motel will lake pictures get advertising releases signed hand cheek Fox introducing several new products may wish try partial list Fox 36 Rear Exhaust mproved version motor won Profile carrier 1975 Available Ball Bearing & Bushing versions FOX combat Special tically improved over 1975 model power-smoother runningmore durable Insert available Slow combat Fox l5BB lable several variations competition model features ' crank shaft structure race over 30000 RPM FOX MANUFACTURING CO 5305 Towson / Ft Smith AR 72901 Junior16 underand Senior everybody else Prizes will consist 020 engines timers kits $25 US Sav ings Bond Flights must made during month July Write J R details entry blank Rubber-Power Prop Hubs NFFS Sup plies has introduced new line prop hubs addition ones has selling several years neatly machined hard aluminum bar stock new ones available two sizes Coupe Wakefield have hinge hole drilled compound angle sell $180 older design has straight hinge holes will continue stocked available four sizes $140 Write complete specs Barbara Parsons NFFS 202 Linda Ave Piedmont CA 94611 Other sources prop hubs such FAI Model Supplies PO Box 9778 Phoenix AZ 85068 Jon Davis 303 Fon tana NE Albuquerque NM 87108 Jim Crocket Replicas 1442 N Fruit Ave Fresno CA 93728 Prop Brake FAI-Power engines mere 7 sec engine runs AMA Category II flyoffs short S sec get ting prop stopped quickly after power cut pretty important top FAI fliers use brakes some sort since K W Enterprises put market mere $325 scarcely excuse using FAt-size unit can also used other Class Class B engines recently Tom Kerr Arnold Waldner K W intro duced version B-C version $275 $375 respectively Three FAt-A-B size will cost $850 of three sizes cost same As proof pudding note both first place third place 1975 World Championships went models using K W 5Stop-A-Prop engine brakes K W also manufactures fiber glass props some 18 sizes com plete price list write Box 18895 Phila delphia PA 19119 Useful Tools items geared model railroad trade might New line rubber-powered prop hubs intro duced NFFS Supplies machined alumi num bar stock Two sizes Coupe Wake field Hinge hole drilled compound angle I/ y p9 1I S C useful free-fighters too items made US marketed North west Short Line wheel gear puller metal brake stripwood cut ter stripwood cutter particularly interesting especially youre putting gether Unlimited Rubber model fuse lage 160 identical diagonals Basic ally consists lever holds single-edge razor blade table guides stops position strip fore cut looks it seems could good job fingers too suggest storing top shelf dont want other kids refer ring kid brother ol Ten thumbs address 4200 Gregory St Oak land CA 94619 84 Model Aviation Kraftsmanship kit processed AAMCO GOLD BALSAThis Trainer will blow apart hits ground GREATEST B/C BASIC TRAINEB Design & Kit ALL TIME Ask over 25000 satisfied builders H-BA Yand dealers sold themSHALL WE SAY MORE Andrews Aircraft Model co Inc US Rte l& North St Topsfield Mass 01983 887-8541 Support AMA FF Duration/Meuser continued page 45 Price $3495 kit per dollar bar em all
Edition: Model Aviation - 1976/08
Page Numbers: 44, 45, 84
Free Flight Twin Props Ever hankerin build rubber-power Twin Bonanza. B-26 Awhile back Fulton Hungerford entered Ford Trimotor Indoor Scale Rubber-Power event Nats wing-mounted props driven rubber motors ran through wing driving props through coil springs served flexible shafts flew early thirties Mamco marketed system driving two wing-mounted props two rubber motors fuselage gear box rear fuselage driven rubber motors transmitted power two music-wire shafts con nected props gearbox didnt use gears used cranks con necting rods same purpose So nothing new Recently two foreign manufacturers have introduced kits twin-engine rub ber-power models Peerless Corp imports Japanese-made Turbo Com mander 690 24-in wingspan Airfix Industries England produces based Fokker Friendship Peerless model uses foam surfaces printed sheet balsa fuselage parts Airfix model all-plastic ready fly Both use single rubber motor fuselage drive gearbox rear wire shafts driven spur gears lace through fuselage wing engine nacelles wing havent seen Airfix model hobby shop shelves local hobby emporium sells Peerless model bit over $10 Worth it. nds relate flying toys competition/sport free-flight nutto column writtenperhaps opens some doors Yep could build such device yourself two could use kit gear box units stick-and-tissue creation own Whether gear drive unit worth price kit depends adept making things like what time worth Buy six units first kid block rubber-power Domier DO-X Book Review Man Powered Flight Keith Sherwin Model Allied Publica tions England What review book about manpowered flight doing Free Flight col umn Well surely isnt RC CL just think People-Powered Free Flight ok edition reviewed Revised Re print 1975 contains material presented original 1971 edition plus added chapters tables covering devel opments last five years havent paying close atten tion fascinating branch sport aviation might come shock learn Duralion cIIO first successful man-powered flightincluding pedal-powered take-off took place over 14 years ago hund reds man-powered flights have accomplished flights up 8/10 mile have achieved termi nated because ran out airport over dozen quite successful man-powered machines have built big question think free-fighter knows its bit hard explain enjoy challenge doing things hard way Bob Meuser Mamco transmission early 30s left stalled rear two rubber motors two musicwire propeller shafts Plc Meuser Below Another twin ready-to-fly Friendship Airfix England Cutaway show propellerdrive mechanism Note tubing over shafts just because challenge Certainly building overgrown stick-and-tissue model plane pedaling through air must difficult way getting Point Point B yet devised mind man book lays out starting predic tably history gliding flight semi-successful pedal-power attempts mid-thirties leading modern efforts sixties seventies Rather complete descriptions var ious pedal-power craft given including 44 Model Aviation Top Imported Peerless 24 Turbo Com mander rubber foam/balsa has flexi ble shafts driven gear box rear fuselage photos drawings short chapter titled Man Power author discusses pros cons pedaling hand cranking rowing com binations presents curves horsepower vs duration turns out athelete can put out about horse power minute half horsepower 100 minutes horse think Id resent Three chapters aerodynamics performance cover fundamentals particular emphasis peculiarities low-speed aerodynamics short chapter Design Studies gives power-requirement calculations four different aircraft graph showing ground effect reduces power requirements aircraft differ ent spans aspect ratios flight altitude chapter drive propulsion dwells considerably mechanical arrangements details leaving few pages complex subject propeller aerody namics considering problem presentation masterfully done follows short chapter Mate ials Construction covering structural mechanics comparisons applications various materials selected problems considerable detail Upon successfully completing chapter reader endowed BS degree Structural Mechanics and E license comes chapter Control cov ering both theoretical practical aspects Consider problem pedaling guts out previous flying experience inapplic able thing supposed fly designed committee grad students made tail too smallany free fighter can see feet unavail able control functions having assigned Propulsion Department handswhich 90% com mitted hanging dear lifeyou supposed fly silly thing straight level chapter titled Uncoventional Aircraft talks lot about ornithopters helicop ters tries convince weirdies rest book about really quite conventional An added 11-page chapter latest developments winds up main text extensive list referencesadded 1975 editionserves finishing touch Signs times original edition hardbound cloth contained 176 pages sold 175 1975 edition paperback 16 pages longer sells 295 about $6 real money contemplating building people-power plane better buy book Sig says has no plans marketing kit foreseeable future Zero-Pitch Prop Last Remem ber article American Aircraft Mod eler about zero-displacement engine Ill bet lot thought tongue-incheek fun-and-games stuff took pretty seriously myself authors thesis since power-to-displacement ratio known increase displacement de creases lets just decrease displacement zeroby using zero strokeand power should infinite least very large something like What author failed point out however infinite shaft speed would required Any fool could see saw right off catch problem matching prop conditions must have right P/D optimum P/D more-or-less proportional J Now J simply v/nD v forward speed n shaft RPM D prop dia meter Now clearly v cannot infinite mean lets realistic Therefore ob vious optimum value J infinite value n zero follows optimum P/D zero Now thats just great Ive thumbed through catalogues until big toes raw trying find stock over-the-counter zero-pitch prop naught simply dont exist Trans-World Airlines rescue TWA has actually bunch zero-pitch props manufactured giving away free ask ing customers P/R types go muck up bit Since 1976 TWA s semiBelow Next time fly TWA ask stewardperson zero-pitch props Its just thing use zero-stroke engine centennialor penta-deci-centennial preferthey went put big raised letters TWA face blade 1926/1976 other increased aerodynamic efficiency sug gest simply sandpaper letter ing off Remember 1926 Back TWA stood Transcontinental Western Airlines Sounds like name railroad Considering speed planes flew days fig ures Next time fly TWA ask stew ardperson dont have zero-displacement engine put can always use swizzle stick Unofficial Events few continuing saga flown NASA Ames Research Lab meet youngsters anything rubber powered will fit 18-inch cube Thermal Thumbers Southern Cal have proposed one-design outdoor rubber-power event Gollywoks Willamette Model ers Club Oregon has planned indoor event rubber-power scaled-down ver sions pre-1942 Gas models 24-in max span tissue covered ROG landing gear may longer scale Erv Rodemsky has proposed half-size Pennyplane event 9-in max span length 5-in max moterstick length Suggestions onedesign gas-power events pop up frequently dont know have actually taken place Cox Baby Bee Starduster 350 perhaps Indoor towline glider other pops up five years latest such event flown Oakland Cloud Dusters rulethe covering conventional Japanesetype tissue AMA-Gas events flown according 1975 AMA rules some Southern Cal meets Are have missed know please drop line eh Oh-Too Oh-Tee Lives back mentioned Bob Oslanhead man down continued page 84 Now available three sizes cover full range FF sizes K & W Stop-a-Prop brakes Used 1 Oloffson win 1975 World Champs August1976 45 Man Powered Flight extensively reviewed product MAP produces eramodeller etc sells $6 comprehensive Cal-Aero Models dropping out 01 020-Old-Timer kit business pleased learn kits formerly made Cal-Aero now being manufac tured J R Models 5021 W Sheri dan Phoenix AZ 85035 underscore fact celebrate 200th anni versary great nation J R will sponsor 1976 Ri-Centennial 020 Powered Free-Flight Replica Postal Con test separate categories ATTENTION NATIONALS CONTESTANTS Fly FOX products 1976 Nationals win CASH AWARD addition trophy $200 cash 1st place events Combat r Open CL Stunt r Open RC Pattern s D RC Quarter Midget $100 cash 1st place other event Requirements win using Fox engine fuel plug Procedure een 5 PM 10 PM bring winning model trophy motel will lake pictures get advertising releases signed hand cheek Fox introducing several new products may wish try partial list Fox 36 Rear Exhaust mproved version motor won Profile carrier 1975 Available Ball Bearing & Bushing versions FOX combat Special tically improved over 1975 model power-smoother runningmore durable Insert available Slow combat Fox l5BB lable several variations competition model features ' crank shaft structure race over 30000 RPM FOX MANUFACTURING CO 5305 Towson / Ft Smith AR 72901 Junior16 underand Senior everybody else Prizes will consist 020 engines timers kits $25 US Sav ings Bond Flights must made during month July Write J R details entry blank Rubber-Power Prop Hubs NFFS Sup plies has introduced new line prop hubs addition ones has selling several years neatly machined hard aluminum bar stock new ones available two sizes Coupe Wakefield have hinge hole drilled compound angle sell $180 older design has straight hinge holes will continue stocked available four sizes $140 Write complete specs Barbara Parsons NFFS 202 Linda Ave Piedmont CA 94611 Other sources prop hubs such FAI Model Supplies PO Box 9778 Phoenix AZ 85068 Jon Davis 303 Fon tana NE Albuquerque NM 87108 Jim Crocket Replicas 1442 N Fruit Ave Fresno CA 93728 Prop Brake FAI-Power engines mere 7 sec engine runs AMA Category II flyoffs short S sec get ting prop stopped quickly after power cut pretty important top FAI fliers use brakes some sort since K W Enterprises put market mere $325 scarcely excuse using FAt-size unit can also used other Class Class B engines recently Tom Kerr Arnold Waldner K W intro duced version B-C version $275 $375 respectively Three FAt-A-B size will cost $850 of three sizes cost same As proof pudding note both first place third place 1975 World Championships went models using K W 5Stop-A-Prop engine brakes K W also manufactures fiber glass props some 18 sizes com plete price list write Box 18895 Phila delphia PA 19119 Useful Tools items geared model railroad trade might New line rubber-powered prop hubs intro duced NFFS Supplies machined alumi num bar stock Two sizes Coupe Wake field Hinge hole drilled compound angle I/ y p9 1I S C useful free-fighters too items made US marketed North west Short Line wheel gear puller metal brake stripwood cut ter stripwood cutter particularly interesting especially youre putting gether Unlimited Rubber model fuse lage 160 identical diagonals Basic ally consists lever holds single-edge razor blade table guides stops position strip fore cut looks it seems could good job fingers too suggest storing top shelf dont want other kids refer ring kid brother ol Ten thumbs address 4200 Gregory St Oak land CA 94619 84 Model Aviation Kraftsmanship kit processed AAMCO GOLD BALSAThis Trainer will blow apart hits ground GREATEST B/C BASIC TRAINEB Design & Kit ALL TIME Ask over 25000 satisfied builders H-BA Yand dealers sold themSHALL WE SAY MORE Andrews Aircraft Model co Inc US Rte l& North St Topsfield Mass 01983 887-8541 Support AMA FF Duration/Meuser continued page 45 Price $3495 kit per dollar bar em all
Edition: Model Aviation - 1976/08
Page Numbers: 44, 45, 84
Free Flight Twin Props Ever hankerin build rubber-power Twin Bonanza. B-26 Awhile back Fulton Hungerford entered Ford Trimotor Indoor Scale Rubber-Power event Nats wing-mounted props driven rubber motors ran through wing driving props through coil springs served flexible shafts flew early thirties Mamco marketed system driving two wing-mounted props two rubber motors fuselage gear box rear fuselage driven rubber motors transmitted power two music-wire shafts con nected props gearbox didnt use gears used cranks con necting rods same purpose So nothing new Recently two foreign manufacturers have introduced kits twin-engine rub ber-power models Peerless Corp imports Japanese-made Turbo Com mander 690 24-in wingspan Airfix Industries England produces based Fokker Friendship Peerless model uses foam surfaces printed sheet balsa fuselage parts Airfix model all-plastic ready fly Both use single rubber motor fuselage drive gearbox rear wire shafts driven spur gears lace through fuselage wing engine nacelles wing havent seen Airfix model hobby shop shelves local hobby emporium sells Peerless model bit over $10 Worth it. nds relate flying toys competition/sport free-flight nutto column writtenperhaps opens some doors Yep could build such device yourself two could use kit gear box units stick-and-tissue creation own Whether gear drive unit worth price kit depends adept making things like what time worth Buy six units first kid block rubber-power Domier DO-X Book Review Man Powered Flight Keith Sherwin Model Allied Publica tions England What review book about manpowered flight doing Free Flight col umn Well surely isnt RC CL just think People-Powered Free Flight ok edition reviewed Revised Re print 1975 contains material presented original 1971 edition plus added chapters tables covering devel opments last five years havent paying close atten tion fascinating branch sport aviation might come shock learn Duralion cIIO first successful man-powered flightincluding pedal-powered take-off took place over 14 years ago hund reds man-powered flights have accomplished flights up 8/10 mile have achieved termi nated because ran out airport over dozen quite successful man-powered machines have built big question think free-fighter knows its bit hard explain enjoy challenge doing things hard way Bob Meuser Mamco transmission early 30s left stalled rear two rubber motors two musicwire propeller shafts Plc Meuser Below Another twin ready-to-fly Friendship Airfix England Cutaway show propellerdrive mechanism Note tubing over shafts just because challenge Certainly building overgrown stick-and-tissue model plane pedaling through air must difficult way getting Point Point B yet devised mind man book lays out starting predic tably history gliding flight semi-successful pedal-power attempts mid-thirties leading modern efforts sixties seventies Rather complete descriptions var ious pedal-power craft given including 44 Model Aviation Top Imported Peerless 24 Turbo Com mander rubber foam/balsa has flexi ble shafts driven gear box rear fuselage photos drawings short chapter titled Man Power author discusses pros cons pedaling hand cranking rowing com binations presents curves horsepower vs duration turns out athelete can put out about horse power minute half horsepower 100 minutes horse think Id resent Three chapters aerodynamics performance cover fundamentals particular emphasis peculiarities low-speed aerodynamics short chapter Design Studies gives power-requirement calculations four different aircraft graph showing ground effect reduces power requirements aircraft differ ent spans aspect ratios flight altitude chapter drive propulsion dwells considerably mechanical arrangements details leaving few pages complex subject propeller aerody namics considering problem presentation masterfully done follows short chapter Mate ials Construction covering structural mechanics comparisons applications various materials selected problems considerable detail Upon successfully completing chapter reader endowed BS degree Structural Mechanics and E license comes chapter Control cov ering both theoretical practical aspects Consider problem pedaling guts out previous flying experience inapplic able thing supposed fly designed committee grad students made tail too smallany free fighter can see feet unavail able control functions having assigned Propulsion Department handswhich 90% com mitted hanging dear lifeyou supposed fly silly thing straight level chapter titled Uncoventional Aircraft talks lot about ornithopters helicop ters tries convince weirdies rest book about really quite conventional An added 11-page chapter latest developments winds up main text extensive list referencesadded 1975 editionserves finishing touch Signs times original edition hardbound cloth contained 176 pages sold 175 1975 edition paperback 16 pages longer sells 295 about $6 real money contemplating building people-power plane better buy book Sig says has no plans marketing kit foreseeable future Zero-Pitch Prop Last Remem ber article American Aircraft Mod eler about zero-displacement engine Ill bet lot thought tongue-incheek fun-and-games stuff took pretty seriously myself authors thesis since power-to-displacement ratio known increase displacement de creases lets just decrease displacement zeroby using zero strokeand power should infinite least very large something like What author failed point out however infinite shaft speed would required Any fool could see saw right off catch problem matching prop conditions must have right P/D optimum P/D more-or-less proportional J Now J simply v/nD v forward speed n shaft RPM D prop dia meter Now clearly v cannot infinite mean lets realistic Therefore ob vious optimum value J infinite value n zero follows optimum P/D zero Now thats just great Ive thumbed through catalogues until big toes raw trying find stock over-the-counter zero-pitch prop naught simply dont exist Trans-World Airlines rescue TWA has actually bunch zero-pitch props manufactured giving away free ask ing customers P/R types go muck up bit Since 1976 TWA s semiBelow Next time fly TWA ask stewardperson zero-pitch props Its just thing use zero-stroke engine centennialor penta-deci-centennial preferthey went put big raised letters TWA face blade 1926/1976 other increased aerodynamic efficiency sug gest simply sandpaper letter ing off Remember 1926 Back TWA stood Transcontinental Western Airlines Sounds like name railroad Considering speed planes flew days fig ures Next time fly TWA ask stew ardperson dont have zero-displacement engine put can always use swizzle stick Unofficial Events few continuing saga flown NASA Ames Research Lab meet youngsters anything rubber powered will fit 18-inch cube Thermal Thumbers Southern Cal have proposed one-design outdoor rubber-power event Gollywoks Willamette Model ers Club Oregon has planned indoor event rubber-power scaled-down ver sions pre-1942 Gas models 24-in max span tissue covered ROG landing gear may longer scale Erv Rodemsky has proposed half-size Pennyplane event 9-in max span length 5-in max moterstick length Suggestions onedesign gas-power events pop up frequently dont know have actually taken place Cox Baby Bee Starduster 350 perhaps Indoor towline glider other pops up five years latest such event flown Oakland Cloud Dusters rulethe covering conventional Japanesetype tissue AMA-Gas events flown according 1975 AMA rules some Southern Cal meets Are have missed know please drop line eh Oh-Too Oh-Tee Lives back mentioned Bob Oslanhead man down continued page 84 Now available three sizes cover full range FF sizes K & W Stop-a-Prop brakes Used 1 Oloffson win 1975 World Champs August1976 45 Man Powered Flight extensively reviewed product MAP produces eramodeller etc sells $6 comprehensive Cal-Aero Models dropping out 01 020-Old-Timer kit business pleased learn kits formerly made Cal-Aero now being manufac tured J R Models 5021 W Sheri dan Phoenix AZ 85035 underscore fact celebrate 200th anni versary great nation J R will sponsor 1976 Ri-Centennial 020 Powered Free-Flight Replica Postal Con test separate categories ATTENTION NATIONALS CONTESTANTS Fly FOX products 1976 Nationals win CASH AWARD addition trophy $200 cash 1st place events Combat r Open CL Stunt r Open RC Pattern s D RC Quarter Midget $100 cash 1st place other event Requirements win using Fox engine fuel plug Procedure een 5 PM 10 PM bring winning model trophy motel will lake pictures get advertising releases signed hand cheek Fox introducing several new products may wish try partial list Fox 36 Rear Exhaust mproved version motor won Profile carrier 1975 Available Ball Bearing & Bushing versions FOX combat Special tically improved over 1975 model power-smoother runningmore durable Insert available Slow combat Fox l5BB lable several variations competition model features ' crank shaft structure race over 30000 RPM FOX MANUFACTURING CO 5305 Towson / Ft Smith AR 72901 Junior16 underand Senior everybody else Prizes will consist 020 engines timers kits $25 US Sav ings Bond Flights must made during month July Write J R details entry blank Rubber-Power Prop Hubs NFFS Sup plies has introduced new line prop hubs addition ones has selling several years neatly machined hard aluminum bar stock new ones available two sizes Coupe Wakefield have hinge hole drilled compound angle sell $180 older design has straight hinge holes will continue stocked available four sizes $140 Write complete specs Barbara Parsons NFFS 202 Linda Ave Piedmont CA 94611 Other sources prop hubs such FAI Model Supplies PO Box 9778 Phoenix AZ 85068 Jon Davis 303 Fon tana NE Albuquerque NM 87108 Jim Crocket Replicas 1442 N Fruit Ave Fresno CA 93728 Prop Brake FAI-Power engines mere 7 sec engine runs AMA Category II flyoffs short S sec get ting prop stopped quickly after power cut pretty important top FAI fliers use brakes some sort since K W Enterprises put market mere $325 scarcely excuse using FAt-size unit can also used other Class Class B engines recently Tom Kerr Arnold Waldner K W intro duced version B-C version $275 $375 respectively Three FAt-A-B size will cost $850 of three sizes cost same As proof pudding note both first place third place 1975 World Championships went models using K W 5Stop-A-Prop engine brakes K W also manufactures fiber glass props some 18 sizes com plete price list write Box 18895 Phila delphia PA 19119 Useful Tools items geared model railroad trade might New line rubber-powered prop hubs intro duced NFFS Supplies machined alumi num bar stock Two sizes Coupe Wake field Hinge hole drilled compound angle I/ y p9 1I S C useful free-fighters too items made US marketed North west Short Line wheel gear puller metal brake stripwood cut ter stripwood cutter particularly interesting especially youre putting gether Unlimited Rubber model fuse lage 160 identical diagonals Basic ally consists lever holds single-edge razor blade table guides stops position strip fore cut looks it seems could good job fingers too suggest storing top shelf dont want other kids refer ring kid brother ol Ten thumbs address 4200 Gregory St Oak land CA 94619 84 Model Aviation Kraftsmanship kit processed AAMCO GOLD BALSAThis Trainer will blow apart hits ground GREATEST B/C BASIC TRAINEB Design & Kit ALL TIME Ask over 25000 satisfied builders H-BA Yand dealers sold themSHALL WE SAY MORE Andrews Aircraft Model co Inc US Rte l& North St Topsfield Mass 01983 887-8541 Support AMA FF Duration/Meuser continued page 45 Price $3495 kit per dollar bar em all