WIRE BRACING Models modern aerobatic biplanes such PiUs Smith Miniplane Christen Eagle EAA Acro Acroduster will fly bracing wires fact addition wires induces drag slows plane makes less aerobatic Wires merely cosmetic enhancement appease guilty feelings about plane looks naked ample thickness wings modern biplanes sufficient deep spars needed carry weight foam wings also have great strength Models antique wire-braced planes will likely need wires keep fragile thin wings fracturing during abrupt maneuvers experience flying wires carry air loads plane airborne need inelastic incidence angles will change aileron action Landing wires support wings wheels make contact ground need have some resiliency order absorb shock occasional bad landing has often resulted torn wires frequently wire anchor ripped its mounting now use springs landing wires system has evolved proving successful rigging thin-winged model wires used braided stainless steel control line cable available hobby shops sizes ranging Right Bobs new DH Tiger Moth has working wire bracing Below L Diminutive spring landing wire wire-braced biplane Wire looped through aluminum tube securely crimped Below R Spring tension OHs doubled landing wires exerts 5-lb pull Force flexes wing slightly tension flying wires beneath wing Lift forces carried landing gear through steel wire between axles 008 021 diameter wire cannot soldered end loops made passing wire through 375 length 062 outside diameter aluminum tube loop formed through anchor wire returned through tube crimped plier tube flattened slightly beforehand will accommodate two wires readily flattened tube does resemble turnbuckle its appearance less offensive oversize tumbuckles commonly used Flying wires should applied first slack removed sag before crimping pulled too tightly warp could induced wing Slack should removed evenly flying wires Slight sag permis sible will tighten later tensioned landing wires installed Adjustment made easier wires made several inches longer needed tube kept inch two loop during equalization tube slid up wire shorten loop before final crimping surplus wire snipped close tube landing wire has spring end tensioning Spring winding described May 79 column Tension springs similar compression except no gap between coils hooks formed ends bending up last turn Coils close wound give maximum initial tension 062 diam eter mandrel using 016 music wire planes uptoeightpoundsor020 forheaviermodels spring about 35 turns will stretched approximately 375 assembled exert force about 1 Y2 2 pounds landing wire 0 16 springs 4 4 pounds 020 tension will flex thin wing slightly take up slack flying wires Installation technique landing wires also uses crimped aluminum tubes end adjustment loose ends pulled through tubes until springs equally stretched before crimping Handy ready-made anchors wire ends flat two-hole soldering lugs available elec tronic supply houses desirable type has straight sides bulge larger hole end can fastened wing small wood screws epoxied slot Another method fastening lug solder nut convenience over hole large end screw fastens wing strut its bracket threaded nut hold both strut wire lug bent bring wire end close possible wing surface best appearance Substitution rubber bands place springs has tried found ineffective due rapid aging variations elasticity need constant attention have also tried springs flying wires found flight trim changed during maneuvers due unwanted stretch under load Steel flying wires remove concern abrupt maneuvers loops steep turns could damage light thin wings numerous examples wire braced monoplanes among antiques such GeeBees Howard racers Travelair Mystery Ships deHavilland 71 Tiger Moth racer Moth recent modeling effort wire bracing functional necessity because its extremely thin flexible wing Without wires wing flexing would bind aileron torque tubes uncomfortable situation steep pylon turn plane landing wires both wings come fuselage top pair springs connect right left wires 5-pound load Springs hidden beneath removable hatch wires prototype doubled model paired wires connect aluminum plate spring links plates 30 Model Aviation Control cables full-size planes use similar method forming loops cable ends steel sleeve swaged over braided cable producing ajoint great strength modeling practice soft aluminum tubes interior surface swaged braided cables convolutions process crimping make joint surprising strength Spring Source letter Phil Mahony gunsmith modeler Lime Rock CT informs us things common between two hobbies Spring makers specialize needs gunsmiths have large stocks springs sizes useful modelers W C Wolf Co PO Box 232 Ardmore PA 19003 spring maker gunsmiths products also available through distributor Bob Brownell Route 2 Box 1 Montezuma Iowa 50171 Phil says Brownell catalog loaded tools ideal modeling purposes wood carving tools pliers pin punches vises Tail Surface Areas too long ago ideal prototype would have plane large tail surfaces modelers often increased areas promote stability proportional control model can flown like full-size plane practice enlarging surfaces hold-over free flight days has diminished fact find opposite may desirable large horizontal surfaces considered detri mental venerable 11-year-old Sopwith 1 Strutter thought ideal because its monstrous stabilizer elevator its flight stability excellent However during landings find impossible bring tail low enough complete stall because elevator will over come ground cushion effect beneath stabilizer landing flare-out continues on across field just above stalling speed Because directional control ailerons rudder poor near stall model wanders about wherever vagrant wind gust will carry models successful landings tail high realism suffers Some Strutters very broad flaps root lower wings employed model probably found necessary order pass through stall point quickly possible stop endless drift across landing field Continued page 106 October 1979 31 Distinctive Beech T-38G turboprop trainer latest work Bud Atkinson Anti-spin strakes fuselage sides forward stab visible Also note fins underside fuselage Piper Pawnee crop duster uses baby powder sprayed fuselage hopper Dick Graham dusted very low altitude perfumed spray reached spectators Model realistically dust covered Thunderbolt P-47 flown Mint Julep Dick White Covered chrome MonoKote sanded realistic finish rivets simulated seamstress tracing wheel Markings probably particular airplane Haruu rarunh readies Bell P-39 Airacobra Mint Julep ilal nas neatly operating sequential landing gear doors simulate full-size Smooth flying plane uses Supertigre 60 engine Art Johnsons well known Lockheed Lightning has spectacular performance attracts tention Fuel tanks jettisoned flight Sealed assembly joints result delayed maintenance troductory Price $8995 S 0 .I6606 S 6SS00 0 Expanded Scale Voltmeter checks bat-U Fuel PumpControl Switch spring-load tery condition both Tx Rx ill side avoid spills urn no Gb-Driver adjustable plug vol- uded tages Automatically compensates forU Starter 12 volt supply elec starter fouled plug Checks plug condition 1000 times per second Operates 12 volt battery source included Field Charger Both Tx Rx either quick-charge trickle modesU Completely Inclosed Can mounted Automatic cut-off protects Ni-Cads ht box used separately Completely Solid State Throughout d SASE Free Catalogl 0 FLASH STARTING ANEW ERA PUBLICATION UNEXCELLED POWERAROBATIC AIRPLANG 0 LOWEST DRAIN49 PAGES 8 XII HOTOS LONGER LIFEBY ROST C MORRISON IS DETAILED DRAWINGS GLOW PLUGS ff ofly $395 PLUS qyCATALOGS SIO0REPLA-TECH 2INTERNATIOPIAL INC SWANSON ASSOCIATES WiL43500 MC KENZIE HWY PT 0X 191WONON VIDA OREGON 97489 69 0UTE 29PEOUANNOCX N W ILlS linders must turn around put pushrods back would equal size h-scale Warner cylinders existed What lift tip sugges tions make 7 diameter wheels 1 dia tires So what cooks have bare-bones fuselage weighs 5 poundswe threw away weight nose form ply because ballast will needed anyway achieve CG located 25% chord SHANGRI LA 45-mile haul casualty gas shortage have flying sites com ing out ears lightly loaded crates fly So lovely greensward much nearer high schoola nice big open field neighbors have annoyed noisewe repaired veritable Lafay ette Escadrilie schoolyard-scale types lo behold appeared group Executive Council types including pres Earl Witt exec John Worth bloody orbiting Buzzard Bombshell Srull de lighted impressive flights rubber pro file Japanese Shindena canard fighter put up Aristocrat Albon Dart Diesel Talk about silent flight Ned Kragness about hundred other things didnt tell about MA story some months ago sistership mechanical trim stabilizer numerous full-scale goodies alas balky Cox seen better days Hurst Bowers put up still another Cox running rich bubbledon Dreamy Luton Minor another bubbly Cox Ace pulse rudder thing will take off smooth ground like Peanut gym hand-launched Talk about slow flight scale-like speeds As circled twi light above line fairly distant trees evoked spirit Old Warden way fly whispered Tongue hanging out replied intelligently Yeah yeah Buzzard got sky high big low-wing cruised high Council types watched knowingly said nothing Wonder what thought strange slow motion fly-in strange schoolyard Northern Virginia peaceful VPs watched building little Aristocrat Said forgotten what flying could like everyone relaxed enjoying himself flying whenever wished Hes dedicated competitorwho also wants get back things way doesnt have give up thing can add considerable pleasure hobby fun things just taking RC Scale/Wischers continued page 31 club field attached local flight strip members brought full size Varga Kachina Shinn 21 50A strip examined plane possible scale project mentioned its tiny tail surfaces being liability because nose wheel could lifted take-off rotation until considerable speed built up What appeared first thought detrimental actually desirable feature since plane must have flying speed before lift off chances snap roll takeoff landing less have similar experiences some scale models have small tail surfaces deHavilland racer mentioned earlier exam ple Old time modelers seeing its tiny tail feathers cast doubt its stability has proven case however models handling near stall has exemplary pitch stability problems have occured other models result overly sensitive elevators greater travel necessary Bob Dolly Wischer Rt 1 S-221 Lapham Peak Road Delafiel4 WI 53018 RC Helicopters/Chesney continued page 33 After initial drop-out helicopter will enter autorotation air moving up through blades will keep somewhat constant speed must keep nose down slight amount forward cyclic Keep helicopter moving forward over-control cyclic comands because cyclic input will affect rotor speed goal maintain constant rotor speed rate angle descent landing flare begins about 6 feet flare simply back stick command no collec tive used reduce rate descent forward speed helicopter Ground speed should reduced near zero As flare begins rotor will momentarily overspeed due exposing greater disc area relative wind Take advantage overspeeding increase collective pitch final soft landing altitude three feet either cyclic flares collective pitch given too early stored energy rotor could used up making landing less soft timing very important Simple Right complete rundown autorotating American K/C Commander available Mike Mas American R/C Helicopter 23811 Via Fabricante Suite 102 Mission Viejo CA 92691 youre flying Heliboy contact Gorham Associates SC Modeler Miniature Aircraft Supply information Heliboy autorotating modifications flying tips product review product review product review Super Blue Set-up Aerotrends way introducing new Super Large size Blue Line siliconehigh qualiryfuel tubing Dimensions Super Large 5/32 10 x 3/32 wall .super large tough Tough enough heavy duty fuel pumping electric fuel pumps water cooling applica tions boats spot need superior strength yet flexibility Super Blue Set-up comes prepackaged 5 lengths attached nozzle tour 41 reusable ties convenience Super Large size Blue Line also available 30 reels Re tail Super Blue Set-up $369 per pkg Super Large reel 69c per foot product review product review product review 106 Model Aviation Flight box included 4 Super Blue Set-Ups Aerotrend Products 44 West Prospect St New Haven CT 06515
Edition: Model Aviation - 1979/10
Page Numbers: 30, 31, 106
WIRE BRACING Models modern aerobatic biplanes such PiUs Smith Miniplane Christen Eagle EAA Acro Acroduster will fly bracing wires fact addition wires induces drag slows plane makes less aerobatic Wires merely cosmetic enhancement appease guilty feelings about plane looks naked ample thickness wings modern biplanes sufficient deep spars needed carry weight foam wings also have great strength Models antique wire-braced planes will likely need wires keep fragile thin wings fracturing during abrupt maneuvers experience flying wires carry air loads plane airborne need inelastic incidence angles will change aileron action Landing wires support wings wheels make contact ground need have some resiliency order absorb shock occasional bad landing has often resulted torn wires frequently wire anchor ripped its mounting now use springs landing wires system has evolved proving successful rigging thin-winged model wires used braided stainless steel control line cable available hobby shops sizes ranging Right Bobs new DH Tiger Moth has working wire bracing Below L Diminutive spring landing wire wire-braced biplane Wire looped through aluminum tube securely crimped Below R Spring tension OHs doubled landing wires exerts 5-lb pull Force flexes wing slightly tension flying wires beneath wing Lift forces carried landing gear through steel wire between axles 008 021 diameter wire cannot soldered end loops made passing wire through 375 length 062 outside diameter aluminum tube loop formed through anchor wire returned through tube crimped plier tube flattened slightly beforehand will accommodate two wires readily flattened tube does resemble turnbuckle its appearance less offensive oversize tumbuckles commonly used Flying wires should applied first slack removed sag before crimping pulled too tightly warp could induced wing Slack should removed evenly flying wires Slight sag permis sible will tighten later tensioned landing wires installed Adjustment made easier wires made several inches longer needed tube kept inch two loop during equalization tube slid up wire shorten loop before final crimping surplus wire snipped close tube landing wire has spring end tensioning Spring winding described May 79 column Tension springs similar compression except no gap between coils hooks formed ends bending up last turn Coils close wound give maximum initial tension 062 diam eter mandrel using 016 music wire planes uptoeightpoundsor020 forheaviermodels spring about 35 turns will stretched approximately 375 assembled exert force about 1 Y2 2 pounds landing wire 0 16 springs 4 4 pounds 020 tension will flex thin wing slightly take up slack flying wires Installation technique landing wires also uses crimped aluminum tubes end adjustment loose ends pulled through tubes until springs equally stretched before crimping Handy ready-made anchors wire ends flat two-hole soldering lugs available elec tronic supply houses desirable type has straight sides bulge larger hole end can fastened wing small wood screws epoxied slot Another method fastening lug solder nut convenience over hole large end screw fastens wing strut its bracket threaded nut hold both strut wire lug bent bring wire end close possible wing surface best appearance Substitution rubber bands place springs has tried found ineffective due rapid aging variations elasticity need constant attention have also tried springs flying wires found flight trim changed during maneuvers due unwanted stretch under load Steel flying wires remove concern abrupt maneuvers loops steep turns could damage light thin wings numerous examples wire braced monoplanes among antiques such GeeBees Howard racers Travelair Mystery Ships deHavilland 71 Tiger Moth racer Moth recent modeling effort wire bracing functional necessity because its extremely thin flexible wing Without wires wing flexing would bind aileron torque tubes uncomfortable situation steep pylon turn plane landing wires both wings come fuselage top pair springs connect right left wires 5-pound load Springs hidden beneath removable hatch wires prototype doubled model paired wires connect aluminum plate spring links plates 30 Model Aviation Control cables full-size planes use similar method forming loops cable ends steel sleeve swaged over braided cable producing ajoint great strength modeling practice soft aluminum tubes interior surface swaged braided cables convolutions process crimping make joint surprising strength Spring Source letter Phil Mahony gunsmith modeler Lime Rock CT informs us things common between two hobbies Spring makers specialize needs gunsmiths have large stocks springs sizes useful modelers W C Wolf Co PO Box 232 Ardmore PA 19003 spring maker gunsmiths products also available through distributor Bob Brownell Route 2 Box 1 Montezuma Iowa 50171 Phil says Brownell catalog loaded tools ideal modeling purposes wood carving tools pliers pin punches vises Tail Surface Areas too long ago ideal prototype would have plane large tail surfaces modelers often increased areas promote stability proportional control model can flown like full-size plane practice enlarging surfaces hold-over free flight days has diminished fact find opposite may desirable large horizontal surfaces considered detri mental venerable 11-year-old Sopwith 1 Strutter thought ideal because its monstrous stabilizer elevator its flight stability excellent However during landings find impossible bring tail low enough complete stall because elevator will over come ground cushion effect beneath stabilizer landing flare-out continues on across field just above stalling speed Because directional control ailerons rudder poor near stall model wanders about wherever vagrant wind gust will carry models successful landings tail high realism suffers Some Strutters very broad flaps root lower wings employed model probably found necessary order pass through stall point quickly possible stop endless drift across landing field Continued page 106 October 1979 31 Distinctive Beech T-38G turboprop trainer latest work Bud Atkinson Anti-spin strakes fuselage sides forward stab visible Also note fins underside fuselage Piper Pawnee crop duster uses baby powder sprayed fuselage hopper Dick Graham dusted very low altitude perfumed spray reached spectators Model realistically dust covered Thunderbolt P-47 flown Mint Julep Dick White Covered chrome MonoKote sanded realistic finish rivets simulated seamstress tracing wheel Markings probably particular airplane Haruu rarunh readies Bell P-39 Airacobra Mint Julep ilal nas neatly operating sequential landing gear doors simulate full-size Smooth flying plane uses Supertigre 60 engine Art Johnsons well known Lockheed Lightning has spectacular performance attracts tention Fuel tanks jettisoned flight Sealed assembly joints result delayed maintenance troductory Price $8995 S 0 .I6606 S 6SS00 0 Expanded Scale Voltmeter checks bat-U Fuel PumpControl Switch spring-load tery condition both Tx Rx ill side avoid spills urn no Gb-Driver adjustable plug vol- uded tages Automatically compensates forU Starter 12 volt supply elec starter fouled plug Checks plug condition 1000 times per second Operates 12 volt battery source included Field Charger Both Tx Rx either quick-charge trickle modesU Completely Inclosed Can mounted Automatic cut-off protects Ni-Cads ht box used separately Completely Solid State Throughout d SASE Free Catalogl 0 FLASH STARTING ANEW ERA PUBLICATION UNEXCELLED POWERAROBATIC AIRPLANG 0 LOWEST DRAIN49 PAGES 8 XII HOTOS LONGER LIFEBY ROST C MORRISON IS DETAILED DRAWINGS GLOW PLUGS ff ofly $395 PLUS qyCATALOGS SIO0REPLA-TECH 2INTERNATIOPIAL INC SWANSON ASSOCIATES WiL43500 MC KENZIE HWY PT 0X 191WONON VIDA OREGON 97489 69 0UTE 29PEOUANNOCX N W ILlS linders must turn around put pushrods back would equal size h-scale Warner cylinders existed What lift tip sugges tions make 7 diameter wheels 1 dia tires So what cooks have bare-bones fuselage weighs 5 poundswe threw away weight nose form ply because ballast will needed anyway achieve CG located 25% chord SHANGRI LA 45-mile haul casualty gas shortage have flying sites com ing out ears lightly loaded crates fly So lovely greensward much nearer high schoola nice big open field neighbors have annoyed noisewe repaired veritable Lafay ette Escadrilie schoolyard-scale types lo behold appeared group Executive Council types including pres Earl Witt exec John Worth bloody orbiting Buzzard Bombshell Srull de lighted impressive flights rubber pro file Japanese Shindena canard fighter put up Aristocrat Albon Dart Diesel Talk about silent flight Ned Kragness about hundred other things didnt tell about MA story some months ago sistership mechanical trim stabilizer numerous full-scale goodies alas balky Cox seen better days Hurst Bowers put up still another Cox running rich bubbledon Dreamy Luton Minor another bubbly Cox Ace pulse rudder thing will take off smooth ground like Peanut gym hand-launched Talk about slow flight scale-like speeds As circled twi light above line fairly distant trees evoked spirit Old Warden way fly whispered Tongue hanging out replied intelligently Yeah yeah Buzzard got sky high big low-wing cruised high Council types watched knowingly said nothing Wonder what thought strange slow motion fly-in strange schoolyard Northern Virginia peaceful VPs watched building little Aristocrat Said forgotten what flying could like everyone relaxed enjoying himself flying whenever wished Hes dedicated competitorwho also wants get back things way doesnt have give up thing can add considerable pleasure hobby fun things just taking RC Scale/Wischers continued page 31 club field attached local flight strip members brought full size Varga Kachina Shinn 21 50A strip examined plane possible scale project mentioned its tiny tail surfaces being liability because nose wheel could lifted take-off rotation until considerable speed built up What appeared first thought detrimental actually desirable feature since plane must have flying speed before lift off chances snap roll takeoff landing less have similar experiences some scale models have small tail surfaces deHavilland racer mentioned earlier exam ple Old time modelers seeing its tiny tail feathers cast doubt its stability has proven case however models handling near stall has exemplary pitch stability problems have occured other models result overly sensitive elevators greater travel necessary Bob Dolly Wischer Rt 1 S-221 Lapham Peak Road Delafiel4 WI 53018 RC Helicopters/Chesney continued page 33 After initial drop-out helicopter will enter autorotation air moving up through blades will keep somewhat constant speed must keep nose down slight amount forward cyclic Keep helicopter moving forward over-control cyclic comands because cyclic input will affect rotor speed goal maintain constant rotor speed rate angle descent landing flare begins about 6 feet flare simply back stick command no collec tive used reduce rate descent forward speed helicopter Ground speed should reduced near zero As flare begins rotor will momentarily overspeed due exposing greater disc area relative wind Take advantage overspeeding increase collective pitch final soft landing altitude three feet either cyclic flares collective pitch given too early stored energy rotor could used up making landing less soft timing very important Simple Right complete rundown autorotating American K/C Commander available Mike Mas American R/C Helicopter 23811 Via Fabricante Suite 102 Mission Viejo CA 92691 youre flying Heliboy contact Gorham Associates SC Modeler Miniature Aircraft Supply information Heliboy autorotating modifications flying tips product review product review product review Super Blue Set-up Aerotrends way introducing new Super Large size Blue Line siliconehigh qualiryfuel tubing Dimensions Super Large 5/32 10 x 3/32 wall .super large tough Tough enough heavy duty fuel pumping electric fuel pumps water cooling applica tions boats spot need superior strength yet flexibility Super Blue Set-up comes prepackaged 5 lengths attached nozzle tour 41 reusable ties convenience Super Large size Blue Line also available 30 reels Re tail Super Blue Set-up $369 per pkg Super Large reel 69c per foot product review product review product review 106 Model Aviation Flight box included 4 Super Blue Set-Ups Aerotrend Products 44 West Prospect St New Haven CT 06515
Edition: Model Aviation - 1979/10
Page Numbers: 30, 31, 106
WIRE BRACING Models modern aerobatic biplanes such PiUs Smith Miniplane Christen Eagle EAA Acro Acroduster will fly bracing wires fact addition wires induces drag slows plane makes less aerobatic Wires merely cosmetic enhancement appease guilty feelings about plane looks naked ample thickness wings modern biplanes sufficient deep spars needed carry weight foam wings also have great strength Models antique wire-braced planes will likely need wires keep fragile thin wings fracturing during abrupt maneuvers experience flying wires carry air loads plane airborne need inelastic incidence angles will change aileron action Landing wires support wings wheels make contact ground need have some resiliency order absorb shock occasional bad landing has often resulted torn wires frequently wire anchor ripped its mounting now use springs landing wires system has evolved proving successful rigging thin-winged model wires used braided stainless steel control line cable available hobby shops sizes ranging Right Bobs new DH Tiger Moth has working wire bracing Below L Diminutive spring landing wire wire-braced biplane Wire looped through aluminum tube securely crimped Below R Spring tension OHs doubled landing wires exerts 5-lb pull Force flexes wing slightly tension flying wires beneath wing Lift forces carried landing gear through steel wire between axles 008 021 diameter wire cannot soldered end loops made passing wire through 375 length 062 outside diameter aluminum tube loop formed through anchor wire returned through tube crimped plier tube flattened slightly beforehand will accommodate two wires readily flattened tube does resemble turnbuckle its appearance less offensive oversize tumbuckles commonly used Flying wires should applied first slack removed sag before crimping pulled too tightly warp could induced wing Slack should removed evenly flying wires Slight sag permis sible will tighten later tensioned landing wires installed Adjustment made easier wires made several inches longer needed tube kept inch two loop during equalization tube slid up wire shorten loop before final crimping surplus wire snipped close tube landing wire has spring end tensioning Spring winding described May 79 column Tension springs similar compression except no gap between coils hooks formed ends bending up last turn Coils close wound give maximum initial tension 062 diam eter mandrel using 016 music wire planes uptoeightpoundsor020 forheaviermodels spring about 35 turns will stretched approximately 375 assembled exert force about 1 Y2 2 pounds landing wire 0 16 springs 4 4 pounds 020 tension will flex thin wing slightly take up slack flying wires Installation technique landing wires also uses crimped aluminum tubes end adjustment loose ends pulled through tubes until springs equally stretched before crimping Handy ready-made anchors wire ends flat two-hole soldering lugs available elec tronic supply houses desirable type has straight sides bulge larger hole end can fastened wing small wood screws epoxied slot Another method fastening lug solder nut convenience over hole large end screw fastens wing strut its bracket threaded nut hold both strut wire lug bent bring wire end close possible wing surface best appearance Substitution rubber bands place springs has tried found ineffective due rapid aging variations elasticity need constant attention have also tried springs flying wires found flight trim changed during maneuvers due unwanted stretch under load Steel flying wires remove concern abrupt maneuvers loops steep turns could damage light thin wings numerous examples wire braced monoplanes among antiques such GeeBees Howard racers Travelair Mystery Ships deHavilland 71 Tiger Moth racer Moth recent modeling effort wire bracing functional necessity because its extremely thin flexible wing Without wires wing flexing would bind aileron torque tubes uncomfortable situation steep pylon turn plane landing wires both wings come fuselage top pair springs connect right left wires 5-pound load Springs hidden beneath removable hatch wires prototype doubled model paired wires connect aluminum plate spring links plates 30 Model Aviation Control cables full-size planes use similar method forming loops cable ends steel sleeve swaged over braided cable producing ajoint great strength modeling practice soft aluminum tubes interior surface swaged braided cables convolutions process crimping make joint surprising strength Spring Source letter Phil Mahony gunsmith modeler Lime Rock CT informs us things common between two hobbies Spring makers specialize needs gunsmiths have large stocks springs sizes useful modelers W C Wolf Co PO Box 232 Ardmore PA 19003 spring maker gunsmiths products also available through distributor Bob Brownell Route 2 Box 1 Montezuma Iowa 50171 Phil says Brownell catalog loaded tools ideal modeling purposes wood carving tools pliers pin punches vises Tail Surface Areas too long ago ideal prototype would have plane large tail surfaces modelers often increased areas promote stability proportional control model can flown like full-size plane practice enlarging surfaces hold-over free flight days has diminished fact find opposite may desirable large horizontal surfaces considered detri mental venerable 11-year-old Sopwith 1 Strutter thought ideal because its monstrous stabilizer elevator its flight stability excellent However during landings find impossible bring tail low enough complete stall because elevator will over come ground cushion effect beneath stabilizer landing flare-out continues on across field just above stalling speed Because directional control ailerons rudder poor near stall model wanders about wherever vagrant wind gust will carry models successful landings tail high realism suffers Some Strutters very broad flaps root lower wings employed model probably found necessary order pass through stall point quickly possible stop endless drift across landing field Continued page 106 October 1979 31 Distinctive Beech T-38G turboprop trainer latest work Bud Atkinson Anti-spin strakes fuselage sides forward stab visible Also note fins underside fuselage Piper Pawnee crop duster uses baby powder sprayed fuselage hopper Dick Graham dusted very low altitude perfumed spray reached spectators Model realistically dust covered Thunderbolt P-47 flown Mint Julep Dick White Covered chrome MonoKote sanded realistic finish rivets simulated seamstress tracing wheel Markings probably particular airplane Haruu rarunh readies Bell P-39 Airacobra Mint Julep ilal nas neatly operating sequential landing gear doors simulate full-size Smooth flying plane uses Supertigre 60 engine Art Johnsons well known Lockheed Lightning has spectacular performance attracts tention Fuel tanks jettisoned flight Sealed assembly joints result delayed maintenance troductory Price $8995 S 0 .I6606 S 6SS00 0 Expanded Scale Voltmeter checks bat-U Fuel PumpControl Switch spring-load tery condition both Tx Rx ill side avoid spills urn no Gb-Driver adjustable plug vol- uded tages Automatically compensates forU Starter 12 volt supply elec starter fouled plug Checks plug condition 1000 times per second Operates 12 volt battery source included Field Charger Both Tx Rx either quick-charge trickle modesU Completely Inclosed Can mounted Automatic cut-off protects Ni-Cads ht box used separately Completely Solid State Throughout d SASE Free Catalogl 0 FLASH STARTING ANEW ERA PUBLICATION UNEXCELLED POWERAROBATIC AIRPLANG 0 LOWEST DRAIN49 PAGES 8 XII HOTOS LONGER LIFEBY ROST C MORRISON IS DETAILED DRAWINGS GLOW PLUGS ff ofly $395 PLUS qyCATALOGS SIO0REPLA-TECH 2INTERNATIOPIAL INC SWANSON ASSOCIATES WiL43500 MC KENZIE HWY PT 0X 191WONON VIDA OREGON 97489 69 0UTE 29PEOUANNOCX N W ILlS linders must turn around put pushrods back would equal size h-scale Warner cylinders existed What lift tip sugges tions make 7 diameter wheels 1 dia tires So what cooks have bare-bones fuselage weighs 5 poundswe threw away weight nose form ply because ballast will needed anyway achieve CG located 25% chord SHANGRI LA 45-mile haul casualty gas shortage have flying sites com ing out ears lightly loaded crates fly So lovely greensward much nearer high schoola nice big open field neighbors have annoyed noisewe repaired veritable Lafay ette Escadrilie schoolyard-scale types lo behold appeared group Executive Council types including pres Earl Witt exec John Worth bloody orbiting Buzzard Bombshell Srull de lighted impressive flights rubber pro file Japanese Shindena canard fighter put up Aristocrat Albon Dart Diesel Talk about silent flight Ned Kragness about hundred other things didnt tell about MA story some months ago sistership mechanical trim stabilizer numerous full-scale goodies alas balky Cox seen better days Hurst Bowers put up still another Cox running rich bubbledon Dreamy Luton Minor another bubbly Cox Ace pulse rudder thing will take off smooth ground like Peanut gym hand-launched Talk about slow flight scale-like speeds As circled twi light above line fairly distant trees evoked spirit Old Warden way fly whispered Tongue hanging out replied intelligently Yeah yeah Buzzard got sky high big low-wing cruised high Council types watched knowingly said nothing Wonder what thought strange slow motion fly-in strange schoolyard Northern Virginia peaceful VPs watched building little Aristocrat Said forgotten what flying could like everyone relaxed enjoying himself flying whenever wished Hes dedicated competitorwho also wants get back things way doesnt have give up thing can add considerable pleasure hobby fun things just taking RC Scale/Wischers continued page 31 club field attached local flight strip members brought full size Varga Kachina Shinn 21 50A strip examined plane possible scale project mentioned its tiny tail surfaces being liability because nose wheel could lifted take-off rotation until considerable speed built up What appeared first thought detrimental actually desirable feature since plane must have flying speed before lift off chances snap roll takeoff landing less have similar experiences some scale models have small tail surfaces deHavilland racer mentioned earlier exam ple Old time modelers seeing its tiny tail feathers cast doubt its stability has proven case however models handling near stall has exemplary pitch stability problems have occured other models result overly sensitive elevators greater travel necessary Bob Dolly Wischer Rt 1 S-221 Lapham Peak Road Delafiel4 WI 53018 RC Helicopters/Chesney continued page 33 After initial drop-out helicopter will enter autorotation air moving up through blades will keep somewhat constant speed must keep nose down slight amount forward cyclic Keep helicopter moving forward over-control cyclic comands because cyclic input will affect rotor speed goal maintain constant rotor speed rate angle descent landing flare begins about 6 feet flare simply back stick command no collec tive used reduce rate descent forward speed helicopter Ground speed should reduced near zero As flare begins rotor will momentarily overspeed due exposing greater disc area relative wind Take advantage overspeeding increase collective pitch final soft landing altitude three feet either cyclic flares collective pitch given too early stored energy rotor could used up making landing less soft timing very important Simple Right complete rundown autorotating American K/C Commander available Mike Mas American R/C Helicopter 23811 Via Fabricante Suite 102 Mission Viejo CA 92691 youre flying Heliboy contact Gorham Associates SC Modeler Miniature Aircraft Supply information Heliboy autorotating modifications flying tips product review product review product review Super Blue Set-up Aerotrends way introducing new Super Large size Blue Line siliconehigh qualiryfuel tubing Dimensions Super Large 5/32 10 x 3/32 wall .super large tough Tough enough heavy duty fuel pumping electric fuel pumps water cooling applica tions boats spot need superior strength yet flexibility Super Blue Set-up comes prepackaged 5 lengths attached nozzle tour 41 reusable ties convenience Super Large size Blue Line also available 30 reels Re tail Super Blue Set-up $369 per pkg Super Large reel 69c per foot product review product review product review 106 Model Aviation Flight box included 4 Super Blue Set-Ups Aerotrend Products 44 West Prospect St New Haven CT 06515