Heilcopters AS TOLD YOU last months column Super-Baby left great deal de sired transitional flight problems solved read Takeoff Collective Because blade speed high Clark-Y blades have some lift zero-degrees setting Super-Baby gets light begins swim before ready lift off solve cam made would give throttle collective first half servo travel also give rapid collective enough throttle during period maintain constant blade speed cam forced change Wall Schoonard collective-throttle setup stock use two pushrods throttle col lective bellcrank placing pushrods cam now worked out trial error until desired relation ship achieved done Super-Baby will sit firmly ground full blade speed make no attempt swim around half-throttle stick full-throttle trim carburetor barrel open five-eighths one-half degree pitch blades next oneand-a-half degrees pitch comes rather quickly permits quick liftoffs fapid descents quick stops changing blade speed very much transitional flight collective can reduced changing blade speed Any additional collective may needed tight turns climbing read ily available increasing decreas ing blade speed next problem very irritating porpoising helicopter hover transitional flight people have called indicating experi encing same problem first thing must checked pushrods mixers collective slide main shaft rods go fly bar must identical length 553 part fly bar must exactly same distance rotor head fly bar level time adjust ment changed must checked exactly equal spacing adjust ments properly made porpoising seemed part cured However during fly-arounds putting helicopter back hover position porpoising reappeared again seemed prevalent pitch highest Using potential custom blade holders set blades free-float like tail-rotor blades flew way no flight configuration did porpoising reoccur landed allowed rotor blades stop own now ob vious lead present blade Using metal straight-edge placed side head plates lead proved inch have since locked blades position have found work really well flight condition Sluggish Cyclic Control During flying Super-Baby proved very slow cyclic control hard turn very slow get stopped forward flight First installed pair Kalt fly-bar paddles helped very little moved 553 blocks continued page 95 Hubert Bitners copter established FAI Speed record 343 mph October 17 own design powered Enya 45 weighs 38 pounds fuel 35 area two-blade rotor 8225 sq Fly bar cans up-front engine flex cable tail-rotor drive features Main rotor turns 1000 rpm tail rotor 2800-4000 Hubert Houston Texas 20 Model Aviation Super-Baby cans blade lead See text modifications improve per formance very popular helicopter Keep joint hot keep checking until dries correct angles Cut glue vortex generators bottom tips using minimum glue tips must light use minimal decorations must sand rotor Square edges required rough surface actually helps Make rotor shaft bearing Bal ance inverted rotor pin push through use very small amount quick epoxy install bearing Before gets rock hard spin rotor its shaft check bearing exactly cen tered both blades same pitch dihe dral reinforce top bottom joint epoxy feathering out end blade hub taper epoxy isnt faired ends abruptly potential stress line created blade will break hits make fuselage cut out pieces glue rudder body bot tom doublers both sides Bend proper angles rotor shaft score rotor mast doubler accept epoxy right side body Double check correct angles Notch nose prop bearing Epoxy rubber hook sufficiently far back hold new rubber snug Decorate body sparingly felt marker trim Monokote etc Dont dope keep light will fly better wont break hits things Trimming Flying Make sure rotor bearing abso lutely free whip plane around pinwheel fashion until critical item sufficiently loose rotor tip can wobble about 1/16 up down care ful use oil will congeal cold weather slightly tight bearing evidenced spiral right glide Test glide indoors spinning rotor running fuselage nose-up ver tical rotor rear rotor maximum speed release smoothly nose forward body parallel ground glide path should 450 Bend landing gear forward back flatten steepen glide respectively turns consistently right left respec tively decrease increase rotor pitch example increasing negative pitch decreases lift vector left advancing side disc makes plane tilt left Avoid changing shaft angles feel must remember tilting rotor forward respect body also tilting body up forward respect rotor moves CG forward tilts rotor forward respect ground down elevator etc Once glide good calm day wind about ten knots launch glide rotor whizzing like mad Use two hands first release prop before plane make sure nose WE REALLY MOVE OUR TAIL FOR YOU say youve latest Hell say flies like charm say its down need new part uve looked high & low cant find whats bothering buddy Call us today part need way Youll back air record time stock parts popu lar radio controlled helicopters almost nobody else country does So somethings bothering call us ally move tail . have thing need inclined about 150 above intended flight path Trim glide note CG moves aft rotor tilts back lift increases right turn develops Use left rudder correct want under no condition allow left turn under power Use right prop thrust cor rect slow roll leftin addition flattening pitch much stall blades slow rotorand consider using less power terms smaller rubber flatter pitch prop bend steam kettle less turns Gradu ally increase power learn con trol launch Try different adjustments CG bending landing gear try different flight patterns stance gear removed 85 glide path provides 12 right circle will take around living room several times right number turns Dont fly about 5-10mph wind case simply release plane running throwing else airspeed will too great After bit practice can throw plane up launch crosswind etc ROG get rotor spinning itself wind let go off car top isnt spinning fast wont fly Windless indoor ROGs possible can get rotor going fast enough doubly disengaging rubberband suitably hooked wound around hub stretched rudder can also used ground spin up rotor twirls releases hub shoots rearward off rudder simple spin-up device hand launches -dia knurled balsa foam ring extending about w hub index finger strikes rear ward right side Let us know succeeds either doing loops ex ceeding 1 mm thermal OK Have fun RC Helicopters/Schoonard continued page 20 fly bar outward quarter inch time lengthen pushrods mixers time adjustment made dont will change pitch setting rotor blades adjusting helped very little quicken cyclic control next thing remove mixers collective slider remove balls lay out hole spacing additional #32 hole can drilled between two exist ing holes sure laid out holes line equally spaced Re-install balls nuts blue Lock-Tite replace slider block After pushrods replaced everything checked out flew again Super-Baby its good thing have dual rate cyclic because now cyclic control burn move 553 blocks back normal set ting now set half inches rotor hub measure ments inside measurements balls facing inward has also flown cans increases cyclic re sponse Excessive Rotor Tilt rotor head free tilt limit mechanical stops helicopter tends act pen dulum reaction can very irritating especially during fast takeoffs stops seemed rigid system would desirable simple solution cover stops /4 inch ID surgical tubing piece installed stop helicopter reflown improve ment obvious some tilt still re mained An additional piece surgical tubing forced over first February 1977 95 tie ftModel Helicopters Division SC MODELER HOBBY SHOP Helm Planes Cars Boats Radios Parts RC Hobbiests 1999 Larkin Avenue Elgin Illinois 50120 Dept 114312 697-3737 FULL-SIZE PLANS No 174 Iron Dog$400 RC Quarter Midget Bell Airacobra has won Pylon contests No175 PRA Special$175 CL 19-powered trainer can modified primary basic advanced No 176 Que dCoupe$300 rubber power attractive Coupe has excellent performance Short Seamew 40-powered Class Carrier model good prototype lends itself innovations $300 Kloud King 15-19 RC Old-Timer Free Flight based upon 1938 record breaker FF $400 wiley Post Biplane Petite durable scale design either rubber tail wagger pulse rudder $225 Max-a-Million fleet free flights problem good A/B FAI$375 Sneat Sport RC glider simple job can flown engine$275 Ernie violetts OH comet CL Scale 1974 Nats first-place winner classic twin$900 Novice simple beginners A-i Nordic constructed entirely sheet balsa$150 GollyGeewhiz Dan Rutherfords simple Half-A powered Combat job turns dime$150 Cathexis Dave Parsons FAI FF has auto-elevator rudder prop brake$450 Gremlin Sturdy aerobatic RC biplane flies well 35s up 60s$300 4-Bits 40-powered RC 500 Club Racer has winning ways Good sport too $400 Semi-Pro Contest-winning HL glider has pop-up tail dethermalizer $100 HaIf-Korda rubber John Oldenkamps 1 /2-size all-balsa Old-Timer$175 Hooptee Mk Ill John Kilsdonks CL Rat Racer involves latest state-of-the-art$175 Rebel Update famed deBolt RC kit Rudder/Elevator/Enginefor 1 Sn Altair Class A-B Free Flight conversion data other classes$400 Gee Bee Model Y 40-powered RC stand-oft scale great old-time racers$500 Callisto superb Standard Class RC sailplane also took Nats first $400 Hyperion Mk V Don Chanceys classic Nordic A-2 competed U S team$275 Fieseler Storch RC scale model 23-45 5-channel has both slots flaps$400 Ambivalent RC assist FF 29-35 2 chan. can converted $400 candle wind Half-A free flight competition type offers looks performance$300 Jaguar FAIlS Combat English champ offers different configuration $225 Nieuport Monoplane Another Hannan cutie C02 indoor/outdoor Brown single twin$150 Blackburn Monoplane RC Scale rendition history-maker wheels floats 40 engine$450 Japanese Myrt CL Carrier Class II model has extremely clean design Rossi 60$275 QuickSilver RC 1 /2A Pylon Racer incorporates latest techniques$200 B-i RC 15 USAF bomber full house Ace foam wings Stable$275 comedian RC fun-fly aerobatic biplane good looker 40 60$400 cardinal SinnerCL stunter 35 engines Detroiter type Very competitive $375 Nesmith cougar FF rubber scale 30-in span Excellent design long flights $300 Fox RC assist FF version 1940 Old-Timer 19 ignition 09 glow 25 cerberus RC 60-powered Pattern job retracts advanced features 5 Tellipsoar RC Standard Class sailplane wins stand-out performance $1000 Free Spirit FF Classes A&B combines excellent power/glide performance $400 1935 Wakefield winner rubber power top job its day will delight old-timer$275 Flying Flag Fran McElwees 60-powered RC saucer Show Teams sport $675 Tercel Keith Trostles 1/2A CL Stunt ship flies excellent pattern $200 Mariha RC Scale sailplaneand no harder build typical soarers . $350 Sunday Sportster RC rudder Uses Ace foam wing Design Ken Willard 049 $250 Sno-Bird Standout Nordic A/2 Jim Walters light thermal conditions $400 Tiger Moth Documentation outline drawing scale plan 13 span 75 Pogo RC Formula Pylon racer bydeBolt based full-scale Owl $750 Midget Mustang CL 1975-1976 Nets winning Goodyear John Ballard$200 Nothing Fancy RC biplane 35 engines pretty handles beautifully Fokker D-23 CL profile push-pull flghter35 tractor 15-25 pusher. $400 Simitar RC spectacular flying-wing 15 fin-mounted tractor . $300 Dennyplane RC version famed cabin model kit 1937. 1 9-25$400 Fast Blasts CL AMA Fast Combat noted designer Richard Wilkens 00 Dixie-Gal FF ClassAfor 09 high-performance airplane$300 Tutorn RC Cabin model scale-like performance 25-35$325 Tic Tac FF all-balsa profile 02 Bob Stalick design$200 RC Helicopters continued made head semi-rigid Could still tilted some pressure head now would snap back center its own Upon flying helicopter now cyclic response very positive feel very good whole helicopter now tilts cyclic commands will stand its tail quick stops other problem soon became appar ent Super-Baby seemed have plenty forward control lacked rearward control close inspection obvious fly-bare-control arm hitting head-side plates rear ward command fix repositioned control arm upward 45 degrees paddles lengthened control pushrod swashplate appropriately simple adjustment cured back-up problem now will back up fast wish Tail-Rotor Mix fly very gently never make fast starts rapid stops need tail-rotor mix ever dont fly way soon came apparent some way must found have automatic tail-rotor mtx two types can used mechanical electrical Next months column will cover detail Someone asked spending much time Heli-Baby gave very simple answer -Baby popular 40-size helicopter world fly extremely well very rugged high rotor speed its corresponding stability introduced Heli-Baby arent flying youre trying Walt Schoonard 2080 Sharon Road Winter Park FL 32789 305-647-1335 ADVERTISERS INDEX Circle numbers plans wish toorder101103 104106111112114115117118120 121123124125126129130131134 135136137138139141145146147 149150151152153155156157158 159160161162163164165166167 168169170171172173174175176 NAME STREET CITY STATE__________ ZIP____________ ENCLOSED$ Price includes first-class postage Send check money order payable Model Aviation AMA 8t5 Fifteenth St. NW. Washington DC 20005 Ace Radio Control Inc87 Aero Modeling Enterprises78 Americas Hobby Center Inc93 Andrews Aircraft Model Co80 Coverite3 Cox Hobbies94 Du-Bro Products Inc85 JT Finley Co89 Flyline Models82 Carl Goldberg Models16 Grish Brothers86 Paul K Guillow Inc83 Harrys Hobbies Inc84 K&B Mfg Company91 Pactra Industries Inc81 Peck-Polymers92 Rocket City RIC Specialties94 SC Modeler Hobby Shop95 Sig Mfg Company1 Sterling Models Inc90 Sullivan Products Inc93 Westport International79 Williams Brothers88 World EnginesBack Cover WRAM Show 197788 96 Model Aviation No 101 No 103 No 104 No 111 No 112 No114 No117 No 118 No 120 No 121 No 123 No124 No 125 No 126 No129 No 130 No 131 No 134 No 135 No 136 No 137 No 138 No 139 No140 No 141 No 145 No 146 No 147 No149 No 150 No 151 No 152 No 153 No 155 No 156 No 157 No 158 No 159 No 160 No 161 No 162 No 163 No164 No 165 No 166 No 167 No 168 No169 No170 No171 No172 No173
Edition: Model Aviation - 1977/02
Page Numbers: 20, 95, 96
Heilcopters AS TOLD YOU last months column Super-Baby left great deal de sired transitional flight problems solved read Takeoff Collective Because blade speed high Clark-Y blades have some lift zero-degrees setting Super-Baby gets light begins swim before ready lift off solve cam made would give throttle collective first half servo travel also give rapid collective enough throttle during period maintain constant blade speed cam forced change Wall Schoonard collective-throttle setup stock use two pushrods throttle col lective bellcrank placing pushrods cam now worked out trial error until desired relation ship achieved done Super-Baby will sit firmly ground full blade speed make no attempt swim around half-throttle stick full-throttle trim carburetor barrel open five-eighths one-half degree pitch blades next oneand-a-half degrees pitch comes rather quickly permits quick liftoffs fapid descents quick stops changing blade speed very much transitional flight collective can reduced changing blade speed Any additional collective may needed tight turns climbing read ily available increasing decreas ing blade speed next problem very irritating porpoising helicopter hover transitional flight people have called indicating experi encing same problem first thing must checked pushrods mixers collective slide main shaft rods go fly bar must identical length 553 part fly bar must exactly same distance rotor head fly bar level time adjust ment changed must checked exactly equal spacing adjust ments properly made porpoising seemed part cured However during fly-arounds putting helicopter back hover position porpoising reappeared again seemed prevalent pitch highest Using potential custom blade holders set blades free-float like tail-rotor blades flew way no flight configuration did porpoising reoccur landed allowed rotor blades stop own now ob vious lead present blade Using metal straight-edge placed side head plates lead proved inch have since locked blades position have found work really well flight condition Sluggish Cyclic Control During flying Super-Baby proved very slow cyclic control hard turn very slow get stopped forward flight First installed pair Kalt fly-bar paddles helped very little moved 553 blocks continued page 95 Hubert Bitners copter established FAI Speed record 343 mph October 17 own design powered Enya 45 weighs 38 pounds fuel 35 area two-blade rotor 8225 sq Fly bar cans up-front engine flex cable tail-rotor drive features Main rotor turns 1000 rpm tail rotor 2800-4000 Hubert Houston Texas 20 Model Aviation Super-Baby cans blade lead See text modifications improve per formance very popular helicopter Keep joint hot keep checking until dries correct angles Cut glue vortex generators bottom tips using minimum glue tips must light use minimal decorations must sand rotor Square edges required rough surface actually helps Make rotor shaft bearing Bal ance inverted rotor pin push through use very small amount quick epoxy install bearing Before gets rock hard spin rotor its shaft check bearing exactly cen tered both blades same pitch dihe dral reinforce top bottom joint epoxy feathering out end blade hub taper epoxy isnt faired ends abruptly potential stress line created blade will break hits make fuselage cut out pieces glue rudder body bot tom doublers both sides Bend proper angles rotor shaft score rotor mast doubler accept epoxy right side body Double check correct angles Notch nose prop bearing Epoxy rubber hook sufficiently far back hold new rubber snug Decorate body sparingly felt marker trim Monokote etc Dont dope keep light will fly better wont break hits things Trimming Flying Make sure rotor bearing abso lutely free whip plane around pinwheel fashion until critical item sufficiently loose rotor tip can wobble about 1/16 up down care ful use oil will congeal cold weather slightly tight bearing evidenced spiral right glide Test glide indoors spinning rotor running fuselage nose-up ver tical rotor rear rotor maximum speed release smoothly nose forward body parallel ground glide path should 450 Bend landing gear forward back flatten steepen glide respectively turns consistently right left respec tively decrease increase rotor pitch example increasing negative pitch decreases lift vector left advancing side disc makes plane tilt left Avoid changing shaft angles feel must remember tilting rotor forward respect body also tilting body up forward respect rotor moves CG forward tilts rotor forward respect ground down elevator etc Once glide good calm day wind about ten knots launch glide rotor whizzing like mad Use two hands first release prop before plane make sure nose WE REALLY MOVE OUR TAIL FOR YOU say youve latest Hell say flies like charm say its down need new part uve looked high & low cant find whats bothering buddy Call us today part need way Youll back air record time stock parts popu lar radio controlled helicopters almost nobody else country does So somethings bothering call us ally move tail . have thing need inclined about 150 above intended flight path Trim glide note CG moves aft rotor tilts back lift increases right turn develops Use left rudder correct want under no condition allow left turn under power Use right prop thrust cor rect slow roll leftin addition flattening pitch much stall blades slow rotorand consider using less power terms smaller rubber flatter pitch prop bend steam kettle less turns Gradu ally increase power learn con trol launch Try different adjustments CG bending landing gear try different flight patterns stance gear removed 85 glide path provides 12 right circle will take around living room several times right number turns Dont fly about 5-10mph wind case simply release plane running throwing else airspeed will too great After bit practice can throw plane up launch crosswind etc ROG get rotor spinning itself wind let go off car top isnt spinning fast wont fly Windless indoor ROGs possible can get rotor going fast enough doubly disengaging rubberband suitably hooked wound around hub stretched rudder can also used ground spin up rotor twirls releases hub shoots rearward off rudder simple spin-up device hand launches -dia knurled balsa foam ring extending about w hub index finger strikes rear ward right side Let us know succeeds either doing loops ex ceeding 1 mm thermal OK Have fun RC Helicopters/Schoonard continued page 20 fly bar outward quarter inch time lengthen pushrods mixers time adjustment made dont will change pitch setting rotor blades adjusting helped very little quicken cyclic control next thing remove mixers collective slider remove balls lay out hole spacing additional #32 hole can drilled between two exist ing holes sure laid out holes line equally spaced Re-install balls nuts blue Lock-Tite replace slider block After pushrods replaced everything checked out flew again Super-Baby its good thing have dual rate cyclic because now cyclic control burn move 553 blocks back normal set ting now set half inches rotor hub measure ments inside measurements balls facing inward has also flown cans increases cyclic re sponse Excessive Rotor Tilt rotor head free tilt limit mechanical stops helicopter tends act pen dulum reaction can very irritating especially during fast takeoffs stops seemed rigid system would desirable simple solution cover stops /4 inch ID surgical tubing piece installed stop helicopter reflown improve ment obvious some tilt still re mained An additional piece surgical tubing forced over first February 1977 95 tie ftModel Helicopters Division SC MODELER HOBBY SHOP Helm Planes Cars Boats Radios Parts RC Hobbiests 1999 Larkin Avenue Elgin Illinois 50120 Dept 114312 697-3737 FULL-SIZE PLANS No 174 Iron Dog$400 RC Quarter Midget Bell Airacobra has won Pylon contests No175 PRA Special$175 CL 19-powered trainer can modified primary basic advanced No 176 Que dCoupe$300 rubber power attractive Coupe has excellent performance Short Seamew 40-powered Class Carrier model good prototype lends itself innovations $300 Kloud King 15-19 RC Old-Timer Free Flight based upon 1938 record breaker FF $400 wiley Post Biplane Petite durable scale design either rubber tail wagger pulse rudder $225 Max-a-Million fleet free flights problem good A/B FAI$375 Sneat Sport RC glider simple job can flown engine$275 Ernie violetts OH comet CL Scale 1974 Nats first-place winner classic twin$900 Novice simple beginners A-i Nordic constructed entirely sheet balsa$150 GollyGeewhiz Dan Rutherfords simple Half-A powered Combat job turns dime$150 Cathexis Dave Parsons FAI FF has auto-elevator rudder prop brake$450 Gremlin Sturdy aerobatic RC biplane flies well 35s up 60s$300 4-Bits 40-powered RC 500 Club Racer has winning ways Good sport too $400 Semi-Pro Contest-winning HL glider has pop-up tail dethermalizer $100 HaIf-Korda rubber John Oldenkamps 1 /2-size all-balsa Old-Timer$175 Hooptee Mk Ill John Kilsdonks CL Rat Racer involves latest state-of-the-art$175 Rebel Update famed deBolt RC kit Rudder/Elevator/Enginefor 1 Sn Altair Class A-B Free Flight conversion data other classes$400 Gee Bee Model Y 40-powered RC stand-oft scale great old-time racers$500 Callisto superb Standard Class RC sailplane also took Nats first $400 Hyperion Mk V Don Chanceys classic Nordic A-2 competed U S team$275 Fieseler Storch RC scale model 23-45 5-channel has both slots flaps$400 Ambivalent RC assist FF 29-35 2 chan. can converted $400 candle wind Half-A free flight competition type offers looks performance$300 Jaguar FAIlS Combat English champ offers different configuration $225 Nieuport Monoplane Another Hannan cutie C02 indoor/outdoor Brown single twin$150 Blackburn Monoplane RC Scale rendition history-maker wheels floats 40 engine$450 Japanese Myrt CL Carrier Class II model has extremely clean design Rossi 60$275 QuickSilver RC 1 /2A Pylon Racer incorporates latest techniques$200 B-i RC 15 USAF bomber full house Ace foam wings Stable$275 comedian RC fun-fly aerobatic biplane good looker 40 60$400 cardinal SinnerCL stunter 35 engines Detroiter type Very competitive $375 Nesmith cougar FF rubber scale 30-in span Excellent design long flights $300 Fox RC assist FF version 1940 Old-Timer 19 ignition 09 glow 25 cerberus RC 60-powered Pattern job retracts advanced features 5 Tellipsoar RC Standard Class sailplane wins stand-out performance $1000 Free Spirit FF Classes A&B combines excellent power/glide performance $400 1935 Wakefield winner rubber power top job its day will delight old-timer$275 Flying Flag Fran McElwees 60-powered RC saucer Show Teams sport $675 Tercel Keith Trostles 1/2A CL Stunt ship flies excellent pattern $200 Mariha RC Scale sailplaneand no harder build typical soarers . $350 Sunday Sportster RC rudder Uses Ace foam wing Design Ken Willard 049 $250 Sno-Bird Standout Nordic A/2 Jim Walters light thermal conditions $400 Tiger Moth Documentation outline drawing scale plan 13 span 75 Pogo RC Formula Pylon racer bydeBolt based full-scale Owl $750 Midget Mustang CL 1975-1976 Nets winning Goodyear John Ballard$200 Nothing Fancy RC biplane 35 engines pretty handles beautifully Fokker D-23 CL profile push-pull flghter35 tractor 15-25 pusher. $400 Simitar RC spectacular flying-wing 15 fin-mounted tractor . $300 Dennyplane RC version famed cabin model kit 1937. 1 9-25$400 Fast Blasts CL AMA Fast Combat noted designer Richard Wilkens 00 Dixie-Gal FF ClassAfor 09 high-performance airplane$300 Tutorn RC Cabin model scale-like performance 25-35$325 Tic Tac FF all-balsa profile 02 Bob Stalick design$200 RC Helicopters continued made head semi-rigid Could still tilted some pressure head now would snap back center its own Upon flying helicopter now cyclic response very positive feel very good whole helicopter now tilts cyclic commands will stand its tail quick stops other problem soon became appar ent Super-Baby seemed have plenty forward control lacked rearward control close inspection obvious fly-bare-control arm hitting head-side plates rear ward command fix repositioned control arm upward 45 degrees paddles lengthened control pushrod swashplate appropriately simple adjustment cured back-up problem now will back up fast wish Tail-Rotor Mix fly very gently never make fast starts rapid stops need tail-rotor mix ever dont fly way soon came apparent some way must found have automatic tail-rotor mtx two types can used mechanical electrical Next months column will cover detail Someone asked spending much time Heli-Baby gave very simple answer -Baby popular 40-size helicopter world fly extremely well very rugged high rotor speed its corresponding stability introduced Heli-Baby arent flying youre trying Walt Schoonard 2080 Sharon Road Winter Park FL 32789 305-647-1335 ADVERTISERS INDEX Circle numbers plans wish toorder101103 104106111112114115117118120 121123124125126129130131134 135136137138139141145146147 149150151152153155156157158 159160161162163164165166167 168169170171172173174175176 NAME STREET CITY STATE__________ ZIP____________ ENCLOSED$ Price includes first-class postage Send check money order payable Model Aviation AMA 8t5 Fifteenth St. NW. Washington DC 20005 Ace Radio Control Inc87 Aero Modeling Enterprises78 Americas Hobby Center Inc93 Andrews Aircraft Model Co80 Coverite3 Cox Hobbies94 Du-Bro Products Inc85 JT Finley Co89 Flyline Models82 Carl Goldberg Models16 Grish Brothers86 Paul K Guillow Inc83 Harrys Hobbies Inc84 K&B Mfg Company91 Pactra Industries Inc81 Peck-Polymers92 Rocket City RIC Specialties94 SC Modeler Hobby Shop95 Sig Mfg Company1 Sterling Models Inc90 Sullivan Products Inc93 Westport International79 Williams Brothers88 World EnginesBack Cover WRAM Show 197788 96 Model Aviation No 101 No 103 No 104 No 111 No 112 No114 No117 No 118 No 120 No 121 No 123 No124 No 125 No 126 No129 No 130 No 131 No 134 No 135 No 136 No 137 No 138 No 139 No140 No 141 No 145 No 146 No 147 No149 No 150 No 151 No 152 No 153 No 155 No 156 No 157 No 158 No 159 No 160 No 161 No 162 No 163 No164 No 165 No 166 No 167 No 168 No169 No170 No171 No172 No173
Edition: Model Aviation - 1977/02
Page Numbers: 20, 95, 96
Heilcopters AS TOLD YOU last months column Super-Baby left great deal de sired transitional flight problems solved read Takeoff Collective Because blade speed high Clark-Y blades have some lift zero-degrees setting Super-Baby gets light begins swim before ready lift off solve cam made would give throttle collective first half servo travel also give rapid collective enough throttle during period maintain constant blade speed cam forced change Wall Schoonard collective-throttle setup stock use two pushrods throttle col lective bellcrank placing pushrods cam now worked out trial error until desired relation ship achieved done Super-Baby will sit firmly ground full blade speed make no attempt swim around half-throttle stick full-throttle trim carburetor barrel open five-eighths one-half degree pitch blades next oneand-a-half degrees pitch comes rather quickly permits quick liftoffs fapid descents quick stops changing blade speed very much transitional flight collective can reduced changing blade speed Any additional collective may needed tight turns climbing read ily available increasing decreas ing blade speed next problem very irritating porpoising helicopter hover transitional flight people have called indicating experi encing same problem first thing must checked pushrods mixers collective slide main shaft rods go fly bar must identical length 553 part fly bar must exactly same distance rotor head fly bar level time adjust ment changed must checked exactly equal spacing adjust ments properly made porpoising seemed part cured However during fly-arounds putting helicopter back hover position porpoising reappeared again seemed prevalent pitch highest Using potential custom blade holders set blades free-float like tail-rotor blades flew way no flight configuration did porpoising reoccur landed allowed rotor blades stop own now ob vious lead present blade Using metal straight-edge placed side head plates lead proved inch have since locked blades position have found work really well flight condition Sluggish Cyclic Control During flying Super-Baby proved very slow cyclic control hard turn very slow get stopped forward flight First installed pair Kalt fly-bar paddles helped very little moved 553 blocks continued page 95 Hubert Bitners copter established FAI Speed record 343 mph October 17 own design powered Enya 45 weighs 38 pounds fuel 35 area two-blade rotor 8225 sq Fly bar cans up-front engine flex cable tail-rotor drive features Main rotor turns 1000 rpm tail rotor 2800-4000 Hubert Houston Texas 20 Model Aviation Super-Baby cans blade lead See text modifications improve per formance very popular helicopter Keep joint hot keep checking until dries correct angles Cut glue vortex generators bottom tips using minimum glue tips must light use minimal decorations must sand rotor Square edges required rough surface actually helps Make rotor shaft bearing Bal ance inverted rotor pin push through use very small amount quick epoxy install bearing Before gets rock hard spin rotor its shaft check bearing exactly cen tered both blades same pitch dihe dral reinforce top bottom joint epoxy feathering out end blade hub taper epoxy isnt faired ends abruptly potential stress line created blade will break hits make fuselage cut out pieces glue rudder body bot tom doublers both sides Bend proper angles rotor shaft score rotor mast doubler accept epoxy right side body Double check correct angles Notch nose prop bearing Epoxy rubber hook sufficiently far back hold new rubber snug Decorate body sparingly felt marker trim Monokote etc Dont dope keep light will fly better wont break hits things Trimming Flying Make sure rotor bearing abso lutely free whip plane around pinwheel fashion until critical item sufficiently loose rotor tip can wobble about 1/16 up down care ful use oil will congeal cold weather slightly tight bearing evidenced spiral right glide Test glide indoors spinning rotor running fuselage nose-up ver tical rotor rear rotor maximum speed release smoothly nose forward body parallel ground glide path should 450 Bend landing gear forward back flatten steepen glide respectively turns consistently right left respec tively decrease increase rotor pitch example increasing negative pitch decreases lift vector left advancing side disc makes plane tilt left Avoid changing shaft angles feel must remember tilting rotor forward respect body also tilting body up forward respect rotor moves CG forward tilts rotor forward respect ground down elevator etc Once glide good calm day wind about ten knots launch glide rotor whizzing like mad Use two hands first release prop before plane make sure nose WE REALLY MOVE OUR TAIL FOR YOU say youve latest Hell say flies like charm say its down need new part uve looked high & low cant find whats bothering buddy Call us today part need way Youll back air record time stock parts popu lar radio controlled helicopters almost nobody else country does So somethings bothering call us ally move tail . have thing need inclined about 150 above intended flight path Trim glide note CG moves aft rotor tilts back lift increases right turn develops Use left rudder correct want under no condition allow left turn under power Use right prop thrust cor rect slow roll leftin addition flattening pitch much stall blades slow rotorand consider using less power terms smaller rubber flatter pitch prop bend steam kettle less turns Gradu ally increase power learn con trol launch Try different adjustments CG bending landing gear try different flight patterns stance gear removed 85 glide path provides 12 right circle will take around living room several times right number turns Dont fly about 5-10mph wind case simply release plane running throwing else airspeed will too great After bit practice can throw plane up launch crosswind etc ROG get rotor spinning itself wind let go off car top isnt spinning fast wont fly Windless indoor ROGs possible can get rotor going fast enough doubly disengaging rubberband suitably hooked wound around hub stretched rudder can also used ground spin up rotor twirls releases hub shoots rearward off rudder simple spin-up device hand launches -dia knurled balsa foam ring extending about w hub index finger strikes rear ward right side Let us know succeeds either doing loops ex ceeding 1 mm thermal OK Have fun RC Helicopters/Schoonard continued page 20 fly bar outward quarter inch time lengthen pushrods mixers time adjustment made dont will change pitch setting rotor blades adjusting helped very little quicken cyclic control next thing remove mixers collective slider remove balls lay out hole spacing additional #32 hole can drilled between two exist ing holes sure laid out holes line equally spaced Re-install balls nuts blue Lock-Tite replace slider block After pushrods replaced everything checked out flew again Super-Baby its good thing have dual rate cyclic because now cyclic control burn move 553 blocks back normal set ting now set half inches rotor hub measure ments inside measurements balls facing inward has also flown cans increases cyclic re sponse Excessive Rotor Tilt rotor head free tilt limit mechanical stops helicopter tends act pen dulum reaction can very irritating especially during fast takeoffs stops seemed rigid system would desirable simple solution cover stops /4 inch ID surgical tubing piece installed stop helicopter reflown improve ment obvious some tilt still re mained An additional piece surgical tubing forced over first February 1977 95 tie ftModel Helicopters Division SC MODELER HOBBY SHOP Helm Planes Cars Boats Radios Parts RC Hobbiests 1999 Larkin Avenue Elgin Illinois 50120 Dept 114312 697-3737 FULL-SIZE PLANS No 174 Iron Dog$400 RC Quarter Midget Bell Airacobra has won Pylon contests No175 PRA Special$175 CL 19-powered trainer can modified primary basic advanced No 176 Que dCoupe$300 rubber power attractive Coupe has excellent performance Short Seamew 40-powered Class Carrier model good prototype lends itself innovations $300 Kloud King 15-19 RC Old-Timer Free Flight based upon 1938 record breaker FF $400 wiley Post Biplane Petite durable scale design either rubber tail wagger pulse rudder $225 Max-a-Million fleet free flights problem good A/B FAI$375 Sneat Sport RC glider simple job can flown engine$275 Ernie violetts OH comet CL Scale 1974 Nats first-place winner classic twin$900 Novice simple beginners A-i Nordic constructed entirely sheet balsa$150 GollyGeewhiz Dan Rutherfords simple Half-A powered Combat job turns dime$150 Cathexis Dave Parsons FAI FF has auto-elevator rudder prop brake$450 Gremlin Sturdy aerobatic RC biplane flies well 35s up 60s$300 4-Bits 40-powered RC 500 Club Racer has winning ways Good sport too $400 Semi-Pro Contest-winning HL glider has pop-up tail dethermalizer $100 HaIf-Korda rubber John Oldenkamps 1 /2-size all-balsa Old-Timer$175 Hooptee Mk Ill John Kilsdonks CL Rat Racer involves latest state-of-the-art$175 Rebel Update famed deBolt RC kit Rudder/Elevator/Enginefor 1 Sn Altair Class A-B Free Flight conversion data other classes$400 Gee Bee Model Y 40-powered RC stand-oft scale great old-time racers$500 Callisto superb Standard Class RC sailplane also took Nats first $400 Hyperion Mk V Don Chanceys classic Nordic A-2 competed U S team$275 Fieseler Storch RC scale model 23-45 5-channel has both slots flaps$400 Ambivalent RC assist FF 29-35 2 chan. can converted $400 candle wind Half-A free flight competition type offers looks performance$300 Jaguar FAIlS Combat English champ offers different configuration $225 Nieuport Monoplane Another Hannan cutie C02 indoor/outdoor Brown single twin$150 Blackburn Monoplane RC Scale rendition history-maker wheels floats 40 engine$450 Japanese Myrt CL Carrier Class II model has extremely clean design Rossi 60$275 QuickSilver RC 1 /2A Pylon Racer incorporates latest techniques$200 B-i RC 15 USAF bomber full house Ace foam wings Stable$275 comedian RC fun-fly aerobatic biplane good looker 40 60$400 cardinal SinnerCL stunter 35 engines Detroiter type Very competitive $375 Nesmith cougar FF rubber scale 30-in span Excellent design long flights $300 Fox RC assist FF version 1940 Old-Timer 19 ignition 09 glow 25 cerberus RC 60-powered Pattern job retracts advanced features 5 Tellipsoar RC Standard Class sailplane wins stand-out performance $1000 Free Spirit FF Classes A&B combines excellent power/glide performance $400 1935 Wakefield winner rubber power top job its day will delight old-timer$275 Flying Flag Fran McElwees 60-powered RC saucer Show Teams sport $675 Tercel Keith Trostles 1/2A CL Stunt ship flies excellent pattern $200 Mariha RC Scale sailplaneand no harder build typical soarers . $350 Sunday Sportster RC rudder Uses Ace foam wing Design Ken Willard 049 $250 Sno-Bird Standout Nordic A/2 Jim Walters light thermal conditions $400 Tiger Moth Documentation outline drawing scale plan 13 span 75 Pogo RC Formula Pylon racer bydeBolt based full-scale Owl $750 Midget Mustang CL 1975-1976 Nets winning Goodyear John Ballard$200 Nothing Fancy RC biplane 35 engines pretty handles beautifully Fokker D-23 CL profile push-pull flghter35 tractor 15-25 pusher. $400 Simitar RC spectacular flying-wing 15 fin-mounted tractor . $300 Dennyplane RC version famed cabin model kit 1937. 1 9-25$400 Fast Blasts CL AMA Fast Combat noted designer Richard Wilkens 00 Dixie-Gal FF ClassAfor 09 high-performance airplane$300 Tutorn RC Cabin model scale-like performance 25-35$325 Tic Tac FF all-balsa profile 02 Bob Stalick design$200 RC Helicopters continued made head semi-rigid Could still tilted some pressure head now would snap back center its own Upon flying helicopter now cyclic response very positive feel very good whole helicopter now tilts cyclic commands will stand its tail quick stops other problem soon became appar ent Super-Baby seemed have plenty forward control lacked rearward control close inspection obvious fly-bare-control arm hitting head-side plates rear ward command fix repositioned control arm upward 45 degrees paddles lengthened control pushrod swashplate appropriately simple adjustment cured back-up problem now will back up fast wish Tail-Rotor Mix fly very gently never make fast starts rapid stops need tail-rotor mix ever dont fly way soon came apparent some way must found have automatic tail-rotor mtx two types can used mechanical electrical Next months column will cover detail Someone asked spending much time Heli-Baby gave very simple answer -Baby popular 40-size helicopter world fly extremely well very rugged high rotor speed its corresponding stability introduced Heli-Baby arent flying youre trying Walt Schoonard 2080 Sharon Road Winter Park FL 32789 305-647-1335 ADVERTISERS INDEX Circle numbers plans wish toorder101103 104106111112114115117118120 121123124125126129130131134 135136137138139141145146147 149150151152153155156157158 159160161162163164165166167 168169170171172173174175176 NAME STREET CITY STATE__________ ZIP____________ ENCLOSED$ Price includes first-class postage Send check money order payable Model Aviation AMA 8t5 Fifteenth St. NW. Washington DC 20005 Ace Radio Control Inc87 Aero Modeling Enterprises78 Americas Hobby Center Inc93 Andrews Aircraft Model Co80 Coverite3 Cox Hobbies94 Du-Bro Products Inc85 JT Finley Co89 Flyline Models82 Carl Goldberg Models16 Grish Brothers86 Paul K Guillow Inc83 Harrys Hobbies Inc84 K&B Mfg Company91 Pactra Industries Inc81 Peck-Polymers92 Rocket City RIC Specialties94 SC Modeler Hobby Shop95 Sig Mfg Company1 Sterling Models Inc90 Sullivan Products Inc93 Westport International79 Williams Brothers88 World EnginesBack Cover WRAM Show 197788 96 Model Aviation No 101 No 103 No 104 No 111 No 112 No114 No117 No 118 No 120 No 121 No 123 No124 No 125 No 126 No129 No 130 No 131 No 134 No 135 No 136 No 137 No 138 No 139 No140 No 141 No 145 No 146 No 147 No149 No 150 No 151 No 152 No 153 No 155 No 156 No 157 No 158 No 159 No 160 No 161 No 162 No 163 No164 No 165 No 166 No 167 No 168 No169 No170 No171 No172 No173