Free Flight INDOOR Bud Tenny QUESTIONS QUESTIONS Any model con struction article such Walt Van Gorders Easy B article Pieces January 1982 MA answers questions also likely raise new questions welL particular some just little experience will able get lot good article invariably lack specific experience will cause hangup communications did happen Walts article following questions came trying clear up points made 1 What advantage assortment props model know use different 2 What meant changing flying condi tions 3 Of course lighter models should fly longer learn build lighter models 4 What some different ways wind motor 5 Explain what washin washout use 6 How make thrust angle adjustments needed tall order questions may can easily covered column lets give try begin builders built two props exactly alike wouldnt Assuming nothing major im portance wrong either two identical props minute differences wood blade align ment weight strength wood used blades talking about Easy B props now prop will work slightly different some cases prop will clearly superior per formance likely very experienced flier will able decide just what differ ence perhaps able repair change poor prop better performance reason building prop see possible improve performance model using different prop Walt made extremely important point article fly model often possible keep good records important factors course same advantages available having several intentionally different props use under differ ent conditions What kind records could probably spend whole column topic brief idea proper flight records 1 Which prop used motor least long loop what size rubber turns launch turns left always unwind motor count turns left end flight etc 2 Room temperature flying conditions calm turbulent drift high altitude obstacles 3 Time day length flight unusual situations Changing conditions implied pre ceding paragraph several factors can affect models performance particular assume site airtight model does drift around air temperature will affect both model flies much power rubber motor has Also flying sites have what called temperature inversion early morning air may cool over site outside air warms up air inside building also warms beginning air top building whole building doesnt warm up uniformly large buildings rarely will Continued page 161 70 Model Aviation Jack Carter keepsthis site-environment-monitoring panel portable workbench Jack Racine WI records temperature pressure humidity gauges flying notes little scale may look fancy its really simple Richard Doig Bloomfield Hills Ml weighs rubber motors flight records Scale calibrated 1/1 OOO-oz divisions Bernie Boehm really unusual Pennyplane prop made Styrofoam sheath 2-litersoda bottle great idea butthis size glass bottle has now discontinued variable-diameter prop built Jim Clem Dallas TX diameter large motortorque high gets progressively smalleras motor unwinds George Myers refers old Austin-Craft timer common use both ignition cutoff dethermalizing slow-leak air timer Doug Dahlke Oshkosh pressed air-leak timer double service using time DT release also using spool weight itself Doug used 70-ft line attach well-wrapped padded timer wingtip Thanks input folks columnists thrive Clarence E Haugh4 3226 Honeysuckle Dr RL 5 Box 16 Coeur dAlene ID 83814 FF Indoor/Tenny Continued page 70 warm air layer top may take quite bit power model break out cooler air warm upper air As soon model gets warm air motor will absorb warmth surrounding air increase temperature will translated extra energy available motor addition air turbulent model will often upset will lose altitude flight time Building light models certain extent following remarks simplification ability build light models depends much tech nique does having super-light wood Briefly keep careful records weight part model various stages building After have flown first model see anything too weak can build part next model little bit lighter again keeping record weights After some part latest model will too light will break often point have discovered limits part model After have discovered light part models can resulting models will much lighter first models built After much practice limits likely outmoded since will have learned handle lighter models safely Washin washout two terms refer intentional wing twist warp Washin means leading edge half wing stab higher trailing edge surface twisted higher angle attack Washout just oppositewing twist reduces angle attack reasons having washin/washout adjust ments wing twofold control torque compensate turning flight think about model flying circle realize inboard wing tip traveling smaller circle outboard wing tip therefore actually flying slower Consequently derive same lift inboard wing necessary crease angle attack airfoil Washin will nicely same way can use reverse twist washout help reduce excess lift generated faster-flying outboard wing model designs minimize amount washin wash out required making inboard wing longer get extra lift having area inboard side model What about torque Torque reaction model twisting force applied propeller rubber motor STINS5~ VOYAGER Quarter Scale 2 oth Kits designed Quadra other 2 cycle engines Plywood & Softwood construction J $9950 Th BONZO Almost 1/3 Scale Sport Pylon Pattern Flying 60 Quadra Power Wing Span 54 1 Pc Shipping Charges Included US & Canada motor turns propeller clockwise also trying turn fuselage counterclockwise adds downward force inboard wing extra washin extra area combination two will help overcome force Thrust adjustments ability change angle thrust line line through prop shaft very useful adjusting Indoor models order able make adjust ment model must have double thrust bear ing prop shaft supported bearing front usually hook rear thrust bearing can bent otherwise adjusted prop shaft can made point some direction other straight forward Some fliers actually plan ahead build favorite thrust adjustments during construction distinctive sound air. Technopowers 7 cylinder 4 cycle Radial Engine Send $200 catalog products TECHNOPOWER H INC 16650 South 104th AVENUE ORLANII PARK ILLINOIS 60462 Capabfe carrying 10 lbs cargo WingSpan 931/4 2pcs GIANT-SCALE PLANS Including Assembly Instructions Available J5 Airplanes Boats $1 795 SET -5 ENTERPRISES 4 Box 82 Belmont Ontario NOt iBO PflOne 1 5194440375 model example nearly always use least small amount left thrust may install after early test flights What benefit thrust adjustments Different adjustments take hold different times example turn installed rudder increases effectiveness model speed creases Turn caused stab tilt largely lowspeed adjustment thrust line adjustments have greatest effect thrust high problem Indoor models have tendency turn open up get wider during power burst Much problem comes fact tightly wound motor distorts modeL major effects Easy Btype models motor stick twists lot sometimes causes reverse stab tilt September 1 982 161 BIG BEAUTIFUL AIRPLANES LOADMASTER 0 ADVERTISERS INDEX AMA Membership ASAE Ace RC Inc Aerolite Products Aeromarine Enterprises Aerotrend Products Air Design Airtronics side Front Cover ha Americas Hobby Center Andrews Aircraft Model Co Applied Design Corp BK ProductsBalsa USA Richard G Barron Bavarian Precision Products Behrens Plan Service Byron Originals Brownsell Flag & Decal Buckeye Balsa CB Associates California Model imports CarollnaTaffinder Charlies RC Goodies Chicago Expo Circus Hobbies George Clapp Consumers Hobby Corp Contempo Enterprises Coverite Cox Hobbies Jim Crocket Replicas DA Enterprises D & D Engineering DG Proiucts DGM industries DaCa Model Products Davey Systems Corp Jim Denaro Model Products Du-Bro Products Dynathrust Props Eastcraft Specialty Products Explorer Enterprises FAI Model Supply FHS Supply Flightilne Shirts ADVERTISERS INDEX 87 160 116 14 129 137 128 155 75 134 125 138 21 136 159 121 141 131 139 153 157 130 124 154 142-148 . 124 118-119 41 121 84-85 134 156 157 152 128 128 138 149 4 20 14 129 124 157 136 153 ADVERTISERS INDEX Flyline Models159 Fourmost Products116 Fox Mfg Co37 Full Command Systems156 Fults Tooling136 Futaba Corp America75 GTModels159 Gator RC Products160 Gemini Models Inc160 Carl Goldberg Models1 Gorham Model Products15 Great Lakes Model & Mold Co124 Great Planes Model Mfg Co150-151 Grish Brothers130 Hardware Systems Hayes Products DR Higgins Associates Hobby Barn Hobby Capitol RC Holby Hideaway Hobby Horn Hobby Lobby Hobby RadIo Shop Hobby Shack Horizon Model Crafts Homer Sales Indian City RC Club Indy RC Sales J-5 Enterprises K & B Mfg Co K & S Engineering Kin Craft Kraft RC Electronics Kraft Systems Kustom Kraftsmanship Left Bank RC Distributors Leisure Electronics Lltco Systems Lone Star Models MACS Products Majestic Models McDaniel RC Service Jim Messers Quality Model Products Midwest Products 120 39 113 114-115 10 159 159 6-9 160 139 . 149 78 117 122-123 161 158 137 157 117 - 157 158 19 131 156 154 125 137 133 ADVERTISERS INDEX Miniature Aircraft Supply117 Model Engineering Norwalk152 Model Merchant158 Model Rectifier Corp side Back Cover Mutchiers Hobbies126-127 Jerry Nelson & Co137 Nor-Cal Avionic140 Peck-Polymers128 PIca Products31 Dave Platt Models20 Plaza Hobby Craft162 Prestige Models113 Proctor Enterprises131 Prop Shop154 RAC Products137 RF Enterprises139 RJL IndustrieS134 RLF Products132 Repla-Tech International130 Rolley Model Products131 Roush Mfg120 Saf-Filte Models130 Sailplane Factory140 Satellite City163 Sheldons Hobby Shop125 Sig Mfg Co13 Bob Smith RC Aircraft132 Spring Air14 Sterling Models121 Sullivan Products47 Tatone Products78 Technopower Ii161 Top Flite Models2 Tower Hobbles135 Twinn-K Inc132 WE Technical services134 138 Waterlines Inc128 Williams Brothers132 Windsor Propeller Co140 World EnginesBack Cover CA Zaic Co129 Zenith Aviation Books5 NIck Ziroll Models130 ADVERTISERS INDEX ADVERTISERS INDEX ADVERTISERS INDEX ADVERTISERS INDEX often twists fuselage enough remove washin washout wing left thrust added thrust helps pull models nose around tighter left circle tends offset turn lost twisting motor stick As consequence often am able use much higher power models some other fliers might note tends out models pretty heavy need power What about winding motors Since rm about out space lets reserve next time lot say about topic very Dwayne Stephens 7253 Red Coat Drive Hamilton OH 45011 513-863-7325 important understand rubber works Bud Tenny PO Box 545 Richardson TX 75080 Scale WC/Wischers Continued page 86 Bob Wischers Ryan SCW both damaged crashes resulted radio problems An extremely sensitive scale used Bill Curtis 2473 E State Street Hermitage PA 16148 412 342-5740 day accurately measure weight model within 1/1000 gram Two planes German team found over 6kg maximum builders found weight could reduced removal such unnecessary items batteries lighting system would have produced insignificant benefit scoring Whereas static scores Stand-Off tightly grouped near top F4C 500-point spread between first sixth places sheer ingenuity design quali ty German team outstanding Detlef Draheims 1/5-scale Bolkow BO 207 Bachstelze used belt-reduction drive originated Maximizer reduction ratio changed 18 1 50 Webra Speed 60 could swing 16-8 prop Detlef made ow oil-and-air shock struts also separate servo trim stabilizer leading edge place elevator trim Josef Mayers 1/3-scale Druine Turbu lent another inconspicuous models awarded high static score wheel brakes operated individually combination depend ing upon rudder position Two full-scale airplanes being de veloped Reno-Stead Airport both pusher-propeller airplanes Lear-Fan advanced-technology project using two turbines drive single carbon-fibre prop second writing advertisers mention read about Model Aviation 162 Model Aviation Eastern US Helicopter Championship Modified NRCHA Format September 25-26 Sharon/Greenville PA Home 19741975 1976&1977 NR CHA NA TS Task competition beginner novice intermediate & expert Includes some aerobatics Preregistration thru September 17-$ 1000 September 8 thru competltion-$ 1500 registration forms information contact
Edition: Model Aviation - 1982/09
Page Numbers: 70, 161, 162
Free Flight INDOOR Bud Tenny QUESTIONS QUESTIONS Any model con struction article such Walt Van Gorders Easy B article Pieces January 1982 MA answers questions also likely raise new questions welL particular some just little experience will able get lot good article invariably lack specific experience will cause hangup communications did happen Walts article following questions came trying clear up points made 1 What advantage assortment props model know use different 2 What meant changing flying condi tions 3 Of course lighter models should fly longer learn build lighter models 4 What some different ways wind motor 5 Explain what washin washout use 6 How make thrust angle adjustments needed tall order questions may can easily covered column lets give try begin builders built two props exactly alike wouldnt Assuming nothing major im portance wrong either two identical props minute differences wood blade align ment weight strength wood used blades talking about Easy B props now prop will work slightly different some cases prop will clearly superior per formance likely very experienced flier will able decide just what differ ence perhaps able repair change poor prop better performance reason building prop see possible improve performance model using different prop Walt made extremely important point article fly model often possible keep good records important factors course same advantages available having several intentionally different props use under differ ent conditions What kind records could probably spend whole column topic brief idea proper flight records 1 Which prop used motor least long loop what size rubber turns launch turns left always unwind motor count turns left end flight etc 2 Room temperature flying conditions calm turbulent drift high altitude obstacles 3 Time day length flight unusual situations Changing conditions implied pre ceding paragraph several factors can affect models performance particular assume site airtight model does drift around air temperature will affect both model flies much power rubber motor has Also flying sites have what called temperature inversion early morning air may cool over site outside air warms up air inside building also warms beginning air top building whole building doesnt warm up uniformly large buildings rarely will Continued page 161 70 Model Aviation Jack Carter keepsthis site-environment-monitoring panel portable workbench Jack Racine WI records temperature pressure humidity gauges flying notes little scale may look fancy its really simple Richard Doig Bloomfield Hills Ml weighs rubber motors flight records Scale calibrated 1/1 OOO-oz divisions Bernie Boehm really unusual Pennyplane prop made Styrofoam sheath 2-litersoda bottle great idea butthis size glass bottle has now discontinued variable-diameter prop built Jim Clem Dallas TX diameter large motortorque high gets progressively smalleras motor unwinds George Myers refers old Austin-Craft timer common use both ignition cutoff dethermalizing slow-leak air timer Doug Dahlke Oshkosh pressed air-leak timer double service using time DT release also using spool weight itself Doug used 70-ft line attach well-wrapped padded timer wingtip Thanks input folks columnists thrive Clarence E Haugh4 3226 Honeysuckle Dr RL 5 Box 16 Coeur dAlene ID 83814 FF Indoor/Tenny Continued page 70 warm air layer top may take quite bit power model break out cooler air warm upper air As soon model gets warm air motor will absorb warmth surrounding air increase temperature will translated extra energy available motor addition air turbulent model will often upset will lose altitude flight time Building light models certain extent following remarks simplification ability build light models depends much tech nique does having super-light wood Briefly keep careful records weight part model various stages building After have flown first model see anything too weak can build part next model little bit lighter again keeping record weights After some part latest model will too light will break often point have discovered limits part model After have discovered light part models can resulting models will much lighter first models built After much practice limits likely outmoded since will have learned handle lighter models safely Washin washout two terms refer intentional wing twist warp Washin means leading edge half wing stab higher trailing edge surface twisted higher angle attack Washout just oppositewing twist reduces angle attack reasons having washin/washout adjust ments wing twofold control torque compensate turning flight think about model flying circle realize inboard wing tip traveling smaller circle outboard wing tip therefore actually flying slower Consequently derive same lift inboard wing necessary crease angle attack airfoil Washin will nicely same way can use reverse twist washout help reduce excess lift generated faster-flying outboard wing model designs minimize amount washin wash out required making inboard wing longer get extra lift having area inboard side model What about torque Torque reaction model twisting force applied propeller rubber motor STINS5~ VOYAGER Quarter Scale 2 oth Kits designed Quadra other 2 cycle engines Plywood & Softwood construction J $9950 Th BONZO Almost 1/3 Scale Sport Pylon Pattern Flying 60 Quadra Power Wing Span 54 1 Pc Shipping Charges Included US & Canada motor turns propeller clockwise also trying turn fuselage counterclockwise adds downward force inboard wing extra washin extra area combination two will help overcome force Thrust adjustments ability change angle thrust line line through prop shaft very useful adjusting Indoor models order able make adjust ment model must have double thrust bear ing prop shaft supported bearing front usually hook rear thrust bearing can bent otherwise adjusted prop shaft can made point some direction other straight forward Some fliers actually plan ahead build favorite thrust adjustments during construction distinctive sound air. Technopowers 7 cylinder 4 cycle Radial Engine Send $200 catalog products TECHNOPOWER H INC 16650 South 104th AVENUE ORLANII PARK ILLINOIS 60462 Capabfe carrying 10 lbs cargo WingSpan 931/4 2pcs GIANT-SCALE PLANS Including Assembly Instructions Available J5 Airplanes Boats $1 795 SET -5 ENTERPRISES 4 Box 82 Belmont Ontario NOt iBO PflOne 1 5194440375 model example nearly always use least small amount left thrust may install after early test flights What benefit thrust adjustments Different adjustments take hold different times example turn installed rudder increases effectiveness model speed creases Turn caused stab tilt largely lowspeed adjustment thrust line adjustments have greatest effect thrust high problem Indoor models have tendency turn open up get wider during power burst Much problem comes fact tightly wound motor distorts modeL major effects Easy Btype models motor stick twists lot sometimes causes reverse stab tilt September 1 982 161 BIG BEAUTIFUL AIRPLANES LOADMASTER 0 ADVERTISERS INDEX AMA Membership ASAE Ace RC Inc Aerolite Products Aeromarine Enterprises Aerotrend Products Air Design Airtronics side Front Cover ha Americas Hobby Center Andrews Aircraft Model Co Applied Design Corp BK ProductsBalsa USA Richard G Barron Bavarian Precision Products Behrens Plan Service Byron Originals Brownsell Flag & Decal Buckeye Balsa CB Associates California Model imports CarollnaTaffinder Charlies RC Goodies Chicago Expo Circus Hobbies George Clapp Consumers Hobby Corp Contempo Enterprises Coverite Cox Hobbies Jim Crocket Replicas DA Enterprises D & D Engineering DG Proiucts DGM industries DaCa Model Products Davey Systems Corp Jim Denaro Model Products Du-Bro Products Dynathrust Props Eastcraft Specialty Products Explorer Enterprises FAI Model Supply FHS Supply Flightilne Shirts ADVERTISERS INDEX 87 160 116 14 129 137 128 155 75 134 125 138 21 136 159 121 141 131 139 153 157 130 124 154 142-148 . 124 118-119 41 121 84-85 134 156 157 152 128 128 138 149 4 20 14 129 124 157 136 153 ADVERTISERS INDEX Flyline Models159 Fourmost Products116 Fox Mfg Co37 Full Command Systems156 Fults Tooling136 Futaba Corp America75 GTModels159 Gator RC Products160 Gemini Models Inc160 Carl Goldberg Models1 Gorham Model Products15 Great Lakes Model & Mold Co124 Great Planes Model Mfg Co150-151 Grish Brothers130 Hardware Systems Hayes Products DR Higgins Associates Hobby Barn Hobby Capitol RC Holby Hideaway Hobby Horn Hobby Lobby Hobby RadIo Shop Hobby Shack Horizon Model Crafts Homer Sales Indian City RC Club Indy RC Sales J-5 Enterprises K & B Mfg Co K & S Engineering Kin Craft Kraft RC Electronics Kraft Systems Kustom Kraftsmanship Left Bank RC Distributors Leisure Electronics Lltco Systems Lone Star Models MACS Products Majestic Models McDaniel RC Service Jim Messers Quality Model Products Midwest Products 120 39 113 114-115 10 159 159 6-9 160 139 . 149 78 117 122-123 161 158 137 157 117 - 157 158 19 131 156 154 125 137 133 ADVERTISERS INDEX Miniature Aircraft Supply117 Model Engineering Norwalk152 Model Merchant158 Model Rectifier Corp side Back Cover Mutchiers Hobbies126-127 Jerry Nelson & Co137 Nor-Cal Avionic140 Peck-Polymers128 PIca Products31 Dave Platt Models20 Plaza Hobby Craft162 Prestige Models113 Proctor Enterprises131 Prop Shop154 RAC Products137 RF Enterprises139 RJL IndustrieS134 RLF Products132 Repla-Tech International130 Rolley Model Products131 Roush Mfg120 Saf-Filte Models130 Sailplane Factory140 Satellite City163 Sheldons Hobby Shop125 Sig Mfg Co13 Bob Smith RC Aircraft132 Spring Air14 Sterling Models121 Sullivan Products47 Tatone Products78 Technopower Ii161 Top Flite Models2 Tower Hobbles135 Twinn-K Inc132 WE Technical services134 138 Waterlines Inc128 Williams Brothers132 Windsor Propeller Co140 World EnginesBack Cover CA Zaic Co129 Zenith Aviation Books5 NIck Ziroll Models130 ADVERTISERS INDEX ADVERTISERS INDEX ADVERTISERS INDEX ADVERTISERS INDEX often twists fuselage enough remove washin washout wing left thrust added thrust helps pull models nose around tighter left circle tends offset turn lost twisting motor stick As consequence often am able use much higher power models some other fliers might note tends out models pretty heavy need power What about winding motors Since rm about out space lets reserve next time lot say about topic very Dwayne Stephens 7253 Red Coat Drive Hamilton OH 45011 513-863-7325 important understand rubber works Bud Tenny PO Box 545 Richardson TX 75080 Scale WC/Wischers Continued page 86 Bob Wischers Ryan SCW both damaged crashes resulted radio problems An extremely sensitive scale used Bill Curtis 2473 E State Street Hermitage PA 16148 412 342-5740 day accurately measure weight model within 1/1000 gram Two planes German team found over 6kg maximum builders found weight could reduced removal such unnecessary items batteries lighting system would have produced insignificant benefit scoring Whereas static scores Stand-Off tightly grouped near top F4C 500-point spread between first sixth places sheer ingenuity design quali ty German team outstanding Detlef Draheims 1/5-scale Bolkow BO 207 Bachstelze used belt-reduction drive originated Maximizer reduction ratio changed 18 1 50 Webra Speed 60 could swing 16-8 prop Detlef made ow oil-and-air shock struts also separate servo trim stabilizer leading edge place elevator trim Josef Mayers 1/3-scale Druine Turbu lent another inconspicuous models awarded high static score wheel brakes operated individually combination depend ing upon rudder position Two full-scale airplanes being de veloped Reno-Stead Airport both pusher-propeller airplanes Lear-Fan advanced-technology project using two turbines drive single carbon-fibre prop second writing advertisers mention read about Model Aviation 162 Model Aviation Eastern US Helicopter Championship Modified NRCHA Format September 25-26 Sharon/Greenville PA Home 19741975 1976&1977 NR CHA NA TS Task competition beginner novice intermediate & expert Includes some aerobatics Preregistration thru September 17-$ 1000 September 8 thru competltion-$ 1500 registration forms information contact
Edition: Model Aviation - 1982/09
Page Numbers: 70, 161, 162
Free Flight INDOOR Bud Tenny QUESTIONS QUESTIONS Any model con struction article such Walt Van Gorders Easy B article Pieces January 1982 MA answers questions also likely raise new questions welL particular some just little experience will able get lot good article invariably lack specific experience will cause hangup communications did happen Walts article following questions came trying clear up points made 1 What advantage assortment props model know use different 2 What meant changing flying condi tions 3 Of course lighter models should fly longer learn build lighter models 4 What some different ways wind motor 5 Explain what washin washout use 6 How make thrust angle adjustments needed tall order questions may can easily covered column lets give try begin builders built two props exactly alike wouldnt Assuming nothing major im portance wrong either two identical props minute differences wood blade align ment weight strength wood used blades talking about Easy B props now prop will work slightly different some cases prop will clearly superior per formance likely very experienced flier will able decide just what differ ence perhaps able repair change poor prop better performance reason building prop see possible improve performance model using different prop Walt made extremely important point article fly model often possible keep good records important factors course same advantages available having several intentionally different props use under differ ent conditions What kind records could probably spend whole column topic brief idea proper flight records 1 Which prop used motor least long loop what size rubber turns launch turns left always unwind motor count turns left end flight etc 2 Room temperature flying conditions calm turbulent drift high altitude obstacles 3 Time day length flight unusual situations Changing conditions implied pre ceding paragraph several factors can affect models performance particular assume site airtight model does drift around air temperature will affect both model flies much power rubber motor has Also flying sites have what called temperature inversion early morning air may cool over site outside air warms up air inside building also warms beginning air top building whole building doesnt warm up uniformly large buildings rarely will Continued page 161 70 Model Aviation Jack Carter keepsthis site-environment-monitoring panel portable workbench Jack Racine WI records temperature pressure humidity gauges flying notes little scale may look fancy its really simple Richard Doig Bloomfield Hills Ml weighs rubber motors flight records Scale calibrated 1/1 OOO-oz divisions Bernie Boehm really unusual Pennyplane prop made Styrofoam sheath 2-litersoda bottle great idea butthis size glass bottle has now discontinued variable-diameter prop built Jim Clem Dallas TX diameter large motortorque high gets progressively smalleras motor unwinds George Myers refers old Austin-Craft timer common use both ignition cutoff dethermalizing slow-leak air timer Doug Dahlke Oshkosh pressed air-leak timer double service using time DT release also using spool weight itself Doug used 70-ft line attach well-wrapped padded timer wingtip Thanks input folks columnists thrive Clarence E Haugh4 3226 Honeysuckle Dr RL 5 Box 16 Coeur dAlene ID 83814 FF Indoor/Tenny Continued page 70 warm air layer top may take quite bit power model break out cooler air warm upper air As soon model gets warm air motor will absorb warmth surrounding air increase temperature will translated extra energy available motor addition air turbulent model will often upset will lose altitude flight time Building light models certain extent following remarks simplification ability build light models depends much tech nique does having super-light wood Briefly keep careful records weight part model various stages building After have flown first model see anything too weak can build part next model little bit lighter again keeping record weights After some part latest model will too light will break often point have discovered limits part model After have discovered light part models can resulting models will much lighter first models built After much practice limits likely outmoded since will have learned handle lighter models safely Washin washout two terms refer intentional wing twist warp Washin means leading edge half wing stab higher trailing edge surface twisted higher angle attack Washout just oppositewing twist reduces angle attack reasons having washin/washout adjust ments wing twofold control torque compensate turning flight think about model flying circle realize inboard wing tip traveling smaller circle outboard wing tip therefore actually flying slower Consequently derive same lift inboard wing necessary crease angle attack airfoil Washin will nicely same way can use reverse twist washout help reduce excess lift generated faster-flying outboard wing model designs minimize amount washin wash out required making inboard wing longer get extra lift having area inboard side model What about torque Torque reaction model twisting force applied propeller rubber motor STINS5~ VOYAGER Quarter Scale 2 oth Kits designed Quadra other 2 cycle engines Plywood & Softwood construction J $9950 Th BONZO Almost 1/3 Scale Sport Pylon Pattern Flying 60 Quadra Power Wing Span 54 1 Pc Shipping Charges Included US & Canada motor turns propeller clockwise also trying turn fuselage counterclockwise adds downward force inboard wing extra washin extra area combination two will help overcome force Thrust adjustments ability change angle thrust line line through prop shaft very useful adjusting Indoor models order able make adjust ment model must have double thrust bear ing prop shaft supported bearing front usually hook rear thrust bearing can bent otherwise adjusted prop shaft can made point some direction other straight forward Some fliers actually plan ahead build favorite thrust adjustments during construction distinctive sound air. Technopowers 7 cylinder 4 cycle Radial Engine Send $200 catalog products TECHNOPOWER H INC 16650 South 104th AVENUE ORLANII PARK ILLINOIS 60462 Capabfe carrying 10 lbs cargo WingSpan 931/4 2pcs GIANT-SCALE PLANS Including Assembly Instructions Available J5 Airplanes Boats $1 795 SET -5 ENTERPRISES 4 Box 82 Belmont Ontario NOt iBO PflOne 1 5194440375 model example nearly always use least small amount left thrust may install after early test flights What benefit thrust adjustments Different adjustments take hold different times example turn installed rudder increases effectiveness model speed creases Turn caused stab tilt largely lowspeed adjustment thrust line adjustments have greatest effect thrust high problem Indoor models have tendency turn open up get wider during power burst Much problem comes fact tightly wound motor distorts modeL major effects Easy Btype models motor stick twists lot sometimes causes reverse stab tilt September 1 982 161 BIG BEAUTIFUL AIRPLANES LOADMASTER 0 ADVERTISERS INDEX AMA Membership ASAE Ace RC Inc Aerolite Products Aeromarine Enterprises Aerotrend Products Air Design Airtronics side Front Cover ha Americas Hobby Center Andrews Aircraft Model Co Applied Design Corp BK ProductsBalsa USA Richard G Barron Bavarian Precision Products Behrens Plan Service Byron Originals Brownsell Flag & Decal Buckeye Balsa CB Associates California Model imports CarollnaTaffinder Charlies RC Goodies Chicago Expo Circus Hobbies George Clapp Consumers Hobby Corp Contempo Enterprises Coverite Cox Hobbies Jim Crocket Replicas DA Enterprises D & D Engineering DG Proiucts DGM industries DaCa Model Products Davey Systems Corp Jim Denaro Model Products Du-Bro Products Dynathrust Props Eastcraft Specialty Products Explorer Enterprises FAI Model Supply FHS Supply Flightilne Shirts ADVERTISERS INDEX 87 160 116 14 129 137 128 155 75 134 125 138 21 136 159 121 141 131 139 153 157 130 124 154 142-148 . 124 118-119 41 121 84-85 134 156 157 152 128 128 138 149 4 20 14 129 124 157 136 153 ADVERTISERS INDEX Flyline Models159 Fourmost Products116 Fox Mfg Co37 Full Command Systems156 Fults Tooling136 Futaba Corp America75 GTModels159 Gator RC Products160 Gemini Models Inc160 Carl Goldberg Models1 Gorham Model Products15 Great Lakes Model & Mold Co124 Great Planes Model Mfg Co150-151 Grish Brothers130 Hardware Systems Hayes Products DR Higgins Associates Hobby Barn Hobby Capitol RC Holby Hideaway Hobby Horn Hobby Lobby Hobby RadIo Shop Hobby Shack Horizon Model Crafts Homer Sales Indian City RC Club Indy RC Sales J-5 Enterprises K & B Mfg Co K & S Engineering Kin Craft Kraft RC Electronics Kraft Systems Kustom Kraftsmanship Left Bank RC Distributors Leisure Electronics Lltco Systems Lone Star Models MACS Products Majestic Models McDaniel RC Service Jim Messers Quality Model Products Midwest Products 120 39 113 114-115 10 159 159 6-9 160 139 . 149 78 117 122-123 161 158 137 157 117 - 157 158 19 131 156 154 125 137 133 ADVERTISERS INDEX Miniature Aircraft Supply117 Model Engineering Norwalk152 Model Merchant158 Model Rectifier Corp side Back Cover Mutchiers Hobbies126-127 Jerry Nelson & Co137 Nor-Cal Avionic140 Peck-Polymers128 PIca Products31 Dave Platt Models20 Plaza Hobby Craft162 Prestige Models113 Proctor Enterprises131 Prop Shop154 RAC Products137 RF Enterprises139 RJL IndustrieS134 RLF Products132 Repla-Tech International130 Rolley Model Products131 Roush Mfg120 Saf-Filte Models130 Sailplane Factory140 Satellite City163 Sheldons Hobby Shop125 Sig Mfg Co13 Bob Smith RC Aircraft132 Spring Air14 Sterling Models121 Sullivan Products47 Tatone Products78 Technopower Ii161 Top Flite Models2 Tower Hobbles135 Twinn-K Inc132 WE Technical services134 138 Waterlines Inc128 Williams Brothers132 Windsor Propeller Co140 World EnginesBack Cover CA Zaic Co129 Zenith Aviation Books5 NIck Ziroll Models130 ADVERTISERS INDEX ADVERTISERS INDEX ADVERTISERS INDEX ADVERTISERS INDEX often twists fuselage enough remove washin washout wing left thrust added thrust helps pull models nose around tighter left circle tends offset turn lost twisting motor stick As consequence often am able use much higher power models some other fliers might note tends out models pretty heavy need power What about winding motors Since rm about out space lets reserve next time lot say about topic very Dwayne Stephens 7253 Red Coat Drive Hamilton OH 45011 513-863-7325 important understand rubber works Bud Tenny PO Box 545 Richardson TX 75080 Scale WC/Wischers Continued page 86 Bob Wischers Ryan SCW both damaged crashes resulted radio problems An extremely sensitive scale used Bill Curtis 2473 E State Street Hermitage PA 16148 412 342-5740 day accurately measure weight model within 1/1000 gram Two planes German team found over 6kg maximum builders found weight could reduced removal such unnecessary items batteries lighting system would have produced insignificant benefit scoring Whereas static scores Stand-Off tightly grouped near top F4C 500-point spread between first sixth places sheer ingenuity design quali ty German team outstanding Detlef Draheims 1/5-scale Bolkow BO 207 Bachstelze used belt-reduction drive originated Maximizer reduction ratio changed 18 1 50 Webra Speed 60 could swing 16-8 prop Detlef made ow oil-and-air shock struts also separate servo trim stabilizer leading edge place elevator trim Josef Mayers 1/3-scale Druine Turbu lent another inconspicuous models awarded high static score wheel brakes operated individually combination depend ing upon rudder position Two full-scale airplanes being de veloped Reno-Stead Airport both pusher-propeller airplanes Lear-Fan advanced-technology project using two turbines drive single carbon-fibre prop second writing advertisers mention read about Model Aviation 162 Model Aviation Eastern US Helicopter Championship Modified NRCHA Format September 25-26 Sharon/Greenville PA Home 19741975 1976&1977 NR CHA NA TS Task competition beginner novice intermediate & expert Includes some aerobatics Preregistration thru September 17-$ 1000 September 8 thru competltion-$ 1500 registration forms information contact