AS practical matter FAA model aviation FCC GB radio Therefore would prefer control AMA AMA controls model aviation ample precedent FAA/EAA relationship dont know EAA Experimental Aviation Associa tionpeople build man-carrying air craft kits scratch works keep FAA FARing homebuilder out skies Part its action teach correct principles Another part its activity certification plans kits suitability just beginning reaction man-killing failures design materials have personal knowledge few instances model airplanes killing maiming anyone Most know concerned U-control models either struck someone came contact high-voltage electric line electro cuted pilot RC pilots have very fortunate far Ive never heard substantiated tale death injuries have extremely rare Professor Sa bins column Law RCM related very few cases ofpersonal injury doesnt mean no danger Ive seen near misses w z w 0 0 U 0 I— z w 0 Cl ha -J 0 SYSTEM RELIABILITY CURVE PREMATURE FAILURES USEFUL LIFE FAILURES DUE TO UNDETECTED WEAKNESS ULATIVE OPERATING TIME IWEAROUT U / FAILURES DUE TO WEAR Fig 1 Heavy line represents sum failures due undetected weakness components failures due wear Figure attempts explain failures occur old new systems want talk about remember So havehas FCC other Federal agencies youare licensing pocket pagers shrimp boats RC know bound change Ittaxicabs whatever right PRS 18 Model Aviation P-38L Jim Funduk isa model Tony Leviers personal airplane presented him end WW II Spanning 841/2 weighs 16 pounds powered two OS 6OFSR engines operating single fuel system Jim shows up year WRAMS new project marvel 72 MHz frequencies limited 3/4 watts less allowed 300 watts limited Al RF pulse operation allowed FM voice operation fly shoot us down. tough No protection interference says FCC Interference will stand up defense opinion After knew could happen took risk Reliability term use des cribe confidence something will work way want Simple things can very reliable rock makes very reliable paperweight say has reliability 1 helium-filled bal loon has almost no value paperweight say has reliability 0 coin usually has two faces reliability coin landing Heads Up time flip 05 unless something improve performance some have known Complex things can very reliable RC systems very reliable So come RC airplanes crash will state proof 90% crashes result two causes 1 Pilot Error 2 Poor Maintenance else explain airplane flies ground operating cor rectly under perfect control What other explanation can give loss control surface hinges flight still have other 10% well remem ber recent vertical dive ground Scared tar out pilot/owner cause hard find eventually found wire broken inside large strain relief manu facturer molded wire prevent such failure reliability complex systems varies during lifetime variation traces back undetected weaknesses built system wearout compo nents shown Fig 1 high rate early failures usually taken care manufacturer operates system before selling what build own parts kit case good idea run system bench before installing plane flight long should run Look situation way will have charge discharge new battery pack 3 4 times form will take hold full charge would wise use charge/dis charge cycles burn system other end operating time Wearout keeps getting closer result shock vibration well service Some things watch Wires break due excessive bending straightening particular resist temptation twist servo pigtails stiffer bundle Keep loose Servo motors get sticky noisy slow down usually result accumulation trash commutator track can sometimes get rid drilling small hole side servomotor spraying TV tuner cleaner other cases can dismantle motor cleaning enough interest can put together column mainte nance myself prefer simply re place motor Potentiometers Wear problem Sometimes have wipe off carbon track assuming have finger-tip get rid brass particles have worn off wiper always worth try wiper shows enough wear make think end about bend break off replace wiping off carbon resistor finger doesnt help try washing some denatured alcohol bend wiper fingers little bit increase contact pressure doesnt restore like-new performance replace Batteries Batteries begin some ability store charge time recharge ability diminishes After couple hundred cycles ability hold charge will half what new happens replace Vibration bad batteries Pack loosely foam want long service life Vibration causes internal short circuits reduces range weakens output servos also causes open circuits Fortunately open circuits rare S Other components no simple way explain capacitor changes value and/or starts leaking just no simple way predict inte grated circuit decides quit careful study problem can sometimes traced back intrusion atmospheric contanil nants cumulative effects high operating temperatures old nemesis vibration tried leave impression few catastrophic failures inherent operation RC systems true question what should about Traditionally model aviation activities have conducted remote locations public danger practically non existant Remote locations thing has become practically non-existant now flying right publics pocket sometimes very real way question has become Can afford failure AMA provides insurance cases cost insurance plus Model Aviation plus other benefits membership such nationwide rules competition contest coordination plus representation worldwide matters affect ing model aviation representation federal level bureaucracies like FAA FCC comes less dues local club really want hurt anyone course systems series string compo nents component fails system fails no alternate paths control Two years ago saw device offered consisted voltage sensor Lithium battery idea voltage receiver dropped reason backup battery automatically came service great ideal wish now paid attention cant find sales literature device would have prevented frightening crash des cribed above Dont bother writing Continued page 102 Jujy 1979 19 Quadra-powered -scale Art Scholls PiUs S-2A seen WRAMS Show type model could benefit dual-parallel system discussed George text new releases Bucker ITT herb clukey wingspan Seagu 11for rubber available soon C02 power SEE YOURsend 25$ DEALER NOWcatalog FLYLINE MODELS INC 282000A53V55u5B PAISPAX VIRGINIA 2200TOOl 532030 cisely extend human arms legs senses man controls crate alivethe pilot its brain will build model Cubs forever Maybe Hazel Sigs Clipped-Wing Cubthe big flies typical air show ship others mind finest model Cubs classic sense 6-foot J-3 Chuck Hollinger appeared Air Trails during fifties kitted Berkeley Berkeley Fairchild low-wing trainer another Hollinger masterpiece Berkeley failed product line went Fox Sig Well bet Sig has some Hollinger J-3 plans barn about Sig Mac Mike Ah Cub-yellow Hollinger Cub What collectors item what bird model Cub captures essence real Cub its framing its flight stuff dreams made RC Technique/Myers continued page 19 about Lithium batteries ELTs know about should no trick make up similar system using nickle cadmium batteries important points 1 backup battery should have separate electrical path receiver avoid total failure broken wire 2 backup battery should operate simultaneously parallel ANNOUNCING Fast Steep Climb FLat Slow Glide 4 new P30 class model designed novice mind has potential win toughest THE POTENT30 Delece kit lectures include Rolled balsa fuselage wing mount dt Completed prop nose plug tail plugS rudder Precut wing ribs spar notches job rated balta strips Highest qualoty tossue lu bed Contest rubber Detailed instructoons flying tips help winl CAT NO R2 $695 PP check money Order CHAS WERLE 3620 MORSE AVE NOS SACTO CALIF 95821 primary battery backup battery idea should incor porated plane powered engine larger 049 larger heavier airplane important protection becomes wind blows dust eyes system fails club has few rules number 1 rule Buddy System Flying alone asking trouble Suppose have make landing cant see kid standing behind runway Does situation always leave enough time take eyes off plane quick look larger models certainly feasible use two parallel completely independent RC systems control No doubt will some complaints about Hogging Channels increased reliability will Mathematically operating two parallel systems 9 reliability system reli ability becomes 99 think unnecessarily high consider fact reliability goal Lunar Module 99999 try figure out achieved Well friends Ive run out column space before have run out ideas have read far consider call new ideas increased RC systms reli ability will publish far space permits credit presenting George Myers 70 Froehlich Farm Rd Hicksvile NY 11801 Ugly/Beckman continued page 22 epoxy use Tra-Bond 2248 made Tra Can Inc 55 North St Medford Mass 02155 can supply what call BIPAX premeasured amounts resin hardener single plastic bag separated plastic clip remove clip mix two parts cut off corner bag squeeze out epoxy Pot life three hours have plenty time assemble things must follow special curing schedule muffler parts fitted ready mix apply epoxy Put thin coat surfaces contact screws before install Run bead epoxy along seams joints epoxy thixotropic helps keep want it will thin out run bit during cure pile too thick Once everything except engine course together let sit room temper ature 700—750F 12 hours specs call two hours at650C two hours 900 C four hours 1 250C temper atures convert 1490F 1940F 2570F will lower end kitchen ovens range arent super critical get close can important shot pick time can tie up oven eight hours straight end result will muffler will hold together normal operating tem peratures engine warts will out sight RC Aerobatics/Van Putte continued page 23 cause during straight flight However air craft speed changes during loops will proba bly cause airplane yaw since correct rudder trim will vary airspeed Check alignment vertical fin fix misalignment discover prepared use rudder during loops correct heading tendency Fiberglass fuselages have gone long way toward elimination bananashaped fuselage curved fuselage causes side force generated after rudder adjusted trim out yawing tendency straight flight combination side force change correct rudder trim during loops causes airplane move sideways change heading Unfortunately elimination problem would require fuselage modification people willing perform alternative use rudder compensate yawing tendency vow build fuselage straight next time Most engine-muffler/pipe installations will cause yaw problems unless rear exhaust engine coupled tuned pipe installed fuselage used drag muffler/pipe causes yawing tendency aircraft Some pipe 102 Model Aviation ONLY LIGHiWEIGHTOUNCE SUPERPERSO FT / COVE RITE STRONGER BY FAR THAN ANY OTHER IRON ON RED WHITE BLUE YELLOW ORANGE ANTIQUE FABRIC COVERIT 420 Babylon Rd Horsham Pa 19044 great schoolyard scale TRAVEL AIR 6000 020 power 36span 12 channel RIC tree flight 51495
Edition: Model Aviation - 1979/07
Page Numbers: 18, 19, 102
AS practical matter FAA model aviation FCC GB radio Therefore would prefer control AMA AMA controls model aviation ample precedent FAA/EAA relationship dont know EAA Experimental Aviation Associa tionpeople build man-carrying air craft kits scratch works keep FAA FARing homebuilder out skies Part its action teach correct principles Another part its activity certification plans kits suitability just beginning reaction man-killing failures design materials have personal knowledge few instances model airplanes killing maiming anyone Most know concerned U-control models either struck someone came contact high-voltage electric line electro cuted pilot RC pilots have very fortunate far Ive never heard substantiated tale death injuries have extremely rare Professor Sa bins column Law RCM related very few cases ofpersonal injury doesnt mean no danger Ive seen near misses w z w 0 0 U 0 I— z w 0 Cl ha -J 0 SYSTEM RELIABILITY CURVE PREMATURE FAILURES USEFUL LIFE FAILURES DUE TO UNDETECTED WEAKNESS ULATIVE OPERATING TIME IWEAROUT U / FAILURES DUE TO WEAR Fig 1 Heavy line represents sum failures due undetected weakness components failures due wear Figure attempts explain failures occur old new systems want talk about remember So havehas FCC other Federal agencies youare licensing pocket pagers shrimp boats RC know bound change Ittaxicabs whatever right PRS 18 Model Aviation P-38L Jim Funduk isa model Tony Leviers personal airplane presented him end WW II Spanning 841/2 weighs 16 pounds powered two OS 6OFSR engines operating single fuel system Jim shows up year WRAMS new project marvel 72 MHz frequencies limited 3/4 watts less allowed 300 watts limited Al RF pulse operation allowed FM voice operation fly shoot us down. tough No protection interference says FCC Interference will stand up defense opinion After knew could happen took risk Reliability term use des cribe confidence something will work way want Simple things can very reliable rock makes very reliable paperweight say has reliability 1 helium-filled bal loon has almost no value paperweight say has reliability 0 coin usually has two faces reliability coin landing Heads Up time flip 05 unless something improve performance some have known Complex things can very reliable RC systems very reliable So come RC airplanes crash will state proof 90% crashes result two causes 1 Pilot Error 2 Poor Maintenance else explain airplane flies ground operating cor rectly under perfect control What other explanation can give loss control surface hinges flight still have other 10% well remem ber recent vertical dive ground Scared tar out pilot/owner cause hard find eventually found wire broken inside large strain relief manu facturer molded wire prevent such failure reliability complex systems varies during lifetime variation traces back undetected weaknesses built system wearout compo nents shown Fig 1 high rate early failures usually taken care manufacturer operates system before selling what build own parts kit case good idea run system bench before installing plane flight long should run Look situation way will have charge discharge new battery pack 3 4 times form will take hold full charge would wise use charge/dis charge cycles burn system other end operating time Wearout keeps getting closer result shock vibration well service Some things watch Wires break due excessive bending straightening particular resist temptation twist servo pigtails stiffer bundle Keep loose Servo motors get sticky noisy slow down usually result accumulation trash commutator track can sometimes get rid drilling small hole side servomotor spraying TV tuner cleaner other cases can dismantle motor cleaning enough interest can put together column mainte nance myself prefer simply re place motor Potentiometers Wear problem Sometimes have wipe off carbon track assuming have finger-tip get rid brass particles have worn off wiper always worth try wiper shows enough wear make think end about bend break off replace wiping off carbon resistor finger doesnt help try washing some denatured alcohol bend wiper fingers little bit increase contact pressure doesnt restore like-new performance replace Batteries Batteries begin some ability store charge time recharge ability diminishes After couple hundred cycles ability hold charge will half what new happens replace Vibration bad batteries Pack loosely foam want long service life Vibration causes internal short circuits reduces range weakens output servos also causes open circuits Fortunately open circuits rare S Other components no simple way explain capacitor changes value and/or starts leaking just no simple way predict inte grated circuit decides quit careful study problem can sometimes traced back intrusion atmospheric contanil nants cumulative effects high operating temperatures old nemesis vibration tried leave impression few catastrophic failures inherent operation RC systems true question what should about Traditionally model aviation activities have conducted remote locations public danger practically non existant Remote locations thing has become practically non-existant now flying right publics pocket sometimes very real way question has become Can afford failure AMA provides insurance cases cost insurance plus Model Aviation plus other benefits membership such nationwide rules competition contest coordination plus representation worldwide matters affect ing model aviation representation federal level bureaucracies like FAA FCC comes less dues local club really want hurt anyone course systems series string compo nents component fails system fails no alternate paths control Two years ago saw device offered consisted voltage sensor Lithium battery idea voltage receiver dropped reason backup battery automatically came service great ideal wish now paid attention cant find sales literature device would have prevented frightening crash des cribed above Dont bother writing Continued page 102 Jujy 1979 19 Quadra-powered -scale Art Scholls PiUs S-2A seen WRAMS Show type model could benefit dual-parallel system discussed George text new releases Bucker ITT herb clukey wingspan Seagu 11for rubber available soon C02 power SEE YOURsend 25$ DEALER NOWcatalog FLYLINE MODELS INC 282000A53V55u5B PAISPAX VIRGINIA 2200TOOl 532030 cisely extend human arms legs senses man controls crate alivethe pilot its brain will build model Cubs forever Maybe Hazel Sigs Clipped-Wing Cubthe big flies typical air show ship others mind finest model Cubs classic sense 6-foot J-3 Chuck Hollinger appeared Air Trails during fifties kitted Berkeley Berkeley Fairchild low-wing trainer another Hollinger masterpiece Berkeley failed product line went Fox Sig Well bet Sig has some Hollinger J-3 plans barn about Sig Mac Mike Ah Cub-yellow Hollinger Cub What collectors item what bird model Cub captures essence real Cub its framing its flight stuff dreams made RC Technique/Myers continued page 19 about Lithium batteries ELTs know about should no trick make up similar system using nickle cadmium batteries important points 1 backup battery should have separate electrical path receiver avoid total failure broken wire 2 backup battery should operate simultaneously parallel ANNOUNCING Fast Steep Climb FLat Slow Glide 4 new P30 class model designed novice mind has potential win toughest THE POTENT30 Delece kit lectures include Rolled balsa fuselage wing mount dt Completed prop nose plug tail plugS rudder Precut wing ribs spar notches job rated balta strips Highest qualoty tossue lu bed Contest rubber Detailed instructoons flying tips help winl CAT NO R2 $695 PP check money Order CHAS WERLE 3620 MORSE AVE NOS SACTO CALIF 95821 primary battery backup battery idea should incor porated plane powered engine larger 049 larger heavier airplane important protection becomes wind blows dust eyes system fails club has few rules number 1 rule Buddy System Flying alone asking trouble Suppose have make landing cant see kid standing behind runway Does situation always leave enough time take eyes off plane quick look larger models certainly feasible use two parallel completely independent RC systems control No doubt will some complaints about Hogging Channels increased reliability will Mathematically operating two parallel systems 9 reliability system reli ability becomes 99 think unnecessarily high consider fact reliability goal Lunar Module 99999 try figure out achieved Well friends Ive run out column space before have run out ideas have read far consider call new ideas increased RC systms reli ability will publish far space permits credit presenting George Myers 70 Froehlich Farm Rd Hicksvile NY 11801 Ugly/Beckman continued page 22 epoxy use Tra-Bond 2248 made Tra Can Inc 55 North St Medford Mass 02155 can supply what call BIPAX premeasured amounts resin hardener single plastic bag separated plastic clip remove clip mix two parts cut off corner bag squeeze out epoxy Pot life three hours have plenty time assemble things must follow special curing schedule muffler parts fitted ready mix apply epoxy Put thin coat surfaces contact screws before install Run bead epoxy along seams joints epoxy thixotropic helps keep want it will thin out run bit during cure pile too thick Once everything except engine course together let sit room temper ature 700—750F 12 hours specs call two hours at650C two hours 900 C four hours 1 250C temper atures convert 1490F 1940F 2570F will lower end kitchen ovens range arent super critical get close can important shot pick time can tie up oven eight hours straight end result will muffler will hold together normal operating tem peratures engine warts will out sight RC Aerobatics/Van Putte continued page 23 cause during straight flight However air craft speed changes during loops will proba bly cause airplane yaw since correct rudder trim will vary airspeed Check alignment vertical fin fix misalignment discover prepared use rudder during loops correct heading tendency Fiberglass fuselages have gone long way toward elimination bananashaped fuselage curved fuselage causes side force generated after rudder adjusted trim out yawing tendency straight flight combination side force change correct rudder trim during loops causes airplane move sideways change heading Unfortunately elimination problem would require fuselage modification people willing perform alternative use rudder compensate yawing tendency vow build fuselage straight next time Most engine-muffler/pipe installations will cause yaw problems unless rear exhaust engine coupled tuned pipe installed fuselage used drag muffler/pipe causes yawing tendency aircraft Some pipe 102 Model Aviation ONLY LIGHiWEIGHTOUNCE SUPERPERSO FT / COVE RITE STRONGER BY FAR THAN ANY OTHER IRON ON RED WHITE BLUE YELLOW ORANGE ANTIQUE FABRIC COVERIT 420 Babylon Rd Horsham Pa 19044 great schoolyard scale TRAVEL AIR 6000 020 power 36span 12 channel RIC tree flight 51495
Edition: Model Aviation - 1979/07
Page Numbers: 18, 19, 102
AS practical matter FAA model aviation FCC GB radio Therefore would prefer control AMA AMA controls model aviation ample precedent FAA/EAA relationship dont know EAA Experimental Aviation Associa tionpeople build man-carrying air craft kits scratch works keep FAA FARing homebuilder out skies Part its action teach correct principles Another part its activity certification plans kits suitability just beginning reaction man-killing failures design materials have personal knowledge few instances model airplanes killing maiming anyone Most know concerned U-control models either struck someone came contact high-voltage electric line electro cuted pilot RC pilots have very fortunate far Ive never heard substantiated tale death injuries have extremely rare Professor Sa bins column Law RCM related very few cases ofpersonal injury doesnt mean no danger Ive seen near misses w z w 0 0 U 0 I— z w 0 Cl ha -J 0 SYSTEM RELIABILITY CURVE PREMATURE FAILURES USEFUL LIFE FAILURES DUE TO UNDETECTED WEAKNESS ULATIVE OPERATING TIME IWEAROUT U / FAILURES DUE TO WEAR Fig 1 Heavy line represents sum failures due undetected weakness components failures due wear Figure attempts explain failures occur old new systems want talk about remember So havehas FCC other Federal agencies youare licensing pocket pagers shrimp boats RC know bound change Ittaxicabs whatever right PRS 18 Model Aviation P-38L Jim Funduk isa model Tony Leviers personal airplane presented him end WW II Spanning 841/2 weighs 16 pounds powered two OS 6OFSR engines operating single fuel system Jim shows up year WRAMS new project marvel 72 MHz frequencies limited 3/4 watts less allowed 300 watts limited Al RF pulse operation allowed FM voice operation fly shoot us down. tough No protection interference says FCC Interference will stand up defense opinion After knew could happen took risk Reliability term use des cribe confidence something will work way want Simple things can very reliable rock makes very reliable paperweight say has reliability 1 helium-filled bal loon has almost no value paperweight say has reliability 0 coin usually has two faces reliability coin landing Heads Up time flip 05 unless something improve performance some have known Complex things can very reliable RC systems very reliable So come RC airplanes crash will state proof 90% crashes result two causes 1 Pilot Error 2 Poor Maintenance else explain airplane flies ground operating cor rectly under perfect control What other explanation can give loss control surface hinges flight still have other 10% well remem ber recent vertical dive ground Scared tar out pilot/owner cause hard find eventually found wire broken inside large strain relief manu facturer molded wire prevent such failure reliability complex systems varies during lifetime variation traces back undetected weaknesses built system wearout compo nents shown Fig 1 high rate early failures usually taken care manufacturer operates system before selling what build own parts kit case good idea run system bench before installing plane flight long should run Look situation way will have charge discharge new battery pack 3 4 times form will take hold full charge would wise use charge/dis charge cycles burn system other end operating time Wearout keeps getting closer result shock vibration well service Some things watch Wires break due excessive bending straightening particular resist temptation twist servo pigtails stiffer bundle Keep loose Servo motors get sticky noisy slow down usually result accumulation trash commutator track can sometimes get rid drilling small hole side servomotor spraying TV tuner cleaner other cases can dismantle motor cleaning enough interest can put together column mainte nance myself prefer simply re place motor Potentiometers Wear problem Sometimes have wipe off carbon track assuming have finger-tip get rid brass particles have worn off wiper always worth try wiper shows enough wear make think end about bend break off replace wiping off carbon resistor finger doesnt help try washing some denatured alcohol bend wiper fingers little bit increase contact pressure doesnt restore like-new performance replace Batteries Batteries begin some ability store charge time recharge ability diminishes After couple hundred cycles ability hold charge will half what new happens replace Vibration bad batteries Pack loosely foam want long service life Vibration causes internal short circuits reduces range weakens output servos also causes open circuits Fortunately open circuits rare S Other components no simple way explain capacitor changes value and/or starts leaking just no simple way predict inte grated circuit decides quit careful study problem can sometimes traced back intrusion atmospheric contanil nants cumulative effects high operating temperatures old nemesis vibration tried leave impression few catastrophic failures inherent operation RC systems true question what should about Traditionally model aviation activities have conducted remote locations public danger practically non existant Remote locations thing has become practically non-existant now flying right publics pocket sometimes very real way question has become Can afford failure AMA provides insurance cases cost insurance plus Model Aviation plus other benefits membership such nationwide rules competition contest coordination plus representation worldwide matters affect ing model aviation representation federal level bureaucracies like FAA FCC comes less dues local club really want hurt anyone course systems series string compo nents component fails system fails no alternate paths control Two years ago saw device offered consisted voltage sensor Lithium battery idea voltage receiver dropped reason backup battery automatically came service great ideal wish now paid attention cant find sales literature device would have prevented frightening crash des cribed above Dont bother writing Continued page 102 Jujy 1979 19 Quadra-powered -scale Art Scholls PiUs S-2A seen WRAMS Show type model could benefit dual-parallel system discussed George text new releases Bucker ITT herb clukey wingspan Seagu 11for rubber available soon C02 power SEE YOURsend 25$ DEALER NOWcatalog FLYLINE MODELS INC 282000A53V55u5B PAISPAX VIRGINIA 2200TOOl 532030 cisely extend human arms legs senses man controls crate alivethe pilot its brain will build model Cubs forever Maybe Hazel Sigs Clipped-Wing Cubthe big flies typical air show ship others mind finest model Cubs classic sense 6-foot J-3 Chuck Hollinger appeared Air Trails during fifties kitted Berkeley Berkeley Fairchild low-wing trainer another Hollinger masterpiece Berkeley failed product line went Fox Sig Well bet Sig has some Hollinger J-3 plans barn about Sig Mac Mike Ah Cub-yellow Hollinger Cub What collectors item what bird model Cub captures essence real Cub its framing its flight stuff dreams made RC Technique/Myers continued page 19 about Lithium batteries ELTs know about should no trick make up similar system using nickle cadmium batteries important points 1 backup battery should have separate electrical path receiver avoid total failure broken wire 2 backup battery should operate simultaneously parallel ANNOUNCING Fast Steep Climb FLat Slow Glide 4 new P30 class model designed novice mind has potential win toughest THE POTENT30 Delece kit lectures include Rolled balsa fuselage wing mount dt Completed prop nose plug tail plugS rudder Precut wing ribs spar notches job rated balta strips Highest qualoty tossue lu bed Contest rubber Detailed instructoons flying tips help winl CAT NO R2 $695 PP check money Order CHAS WERLE 3620 MORSE AVE NOS SACTO CALIF 95821 primary battery backup battery idea should incor porated plane powered engine larger 049 larger heavier airplane important protection becomes wind blows dust eyes system fails club has few rules number 1 rule Buddy System Flying alone asking trouble Suppose have make landing cant see kid standing behind runway Does situation always leave enough time take eyes off plane quick look larger models certainly feasible use two parallel completely independent RC systems control No doubt will some complaints about Hogging Channels increased reliability will Mathematically operating two parallel systems 9 reliability system reli ability becomes 99 think unnecessarily high consider fact reliability goal Lunar Module 99999 try figure out achieved Well friends Ive run out column space before have run out ideas have read far consider call new ideas increased RC systms reli ability will publish far space permits credit presenting George Myers 70 Froehlich Farm Rd Hicksvile NY 11801 Ugly/Beckman continued page 22 epoxy use Tra-Bond 2248 made Tra Can Inc 55 North St Medford Mass 02155 can supply what call BIPAX premeasured amounts resin hardener single plastic bag separated plastic clip remove clip mix two parts cut off corner bag squeeze out epoxy Pot life three hours have plenty time assemble things must follow special curing schedule muffler parts fitted ready mix apply epoxy Put thin coat surfaces contact screws before install Run bead epoxy along seams joints epoxy thixotropic helps keep want it will thin out run bit during cure pile too thick Once everything except engine course together let sit room temper ature 700—750F 12 hours specs call two hours at650C two hours 900 C four hours 1 250C temper atures convert 1490F 1940F 2570F will lower end kitchen ovens range arent super critical get close can important shot pick time can tie up oven eight hours straight end result will muffler will hold together normal operating tem peratures engine warts will out sight RC Aerobatics/Van Putte continued page 23 cause during straight flight However air craft speed changes during loops will proba bly cause airplane yaw since correct rudder trim will vary airspeed Check alignment vertical fin fix misalignment discover prepared use rudder during loops correct heading tendency Fiberglass fuselages have gone long way toward elimination bananashaped fuselage curved fuselage causes side force generated after rudder adjusted trim out yawing tendency straight flight combination side force change correct rudder trim during loops causes airplane move sideways change heading Unfortunately elimination problem would require fuselage modification people willing perform alternative use rudder compensate yawing tendency vow build fuselage straight next time Most engine-muffler/pipe installations will cause yaw problems unless rear exhaust engine coupled tuned pipe installed fuselage used drag muffler/pipe causes yawing tendency aircraft Some pipe 102 Model Aviation ONLY LIGHiWEIGHTOUNCE SUPERPERSO FT / COVE RITE STRONGER BY FAR THAN ANY OTHER IRON ON RED WHITE BLUE YELLOW ORANGE ANTIQUE FABRIC COVERIT 420 Babylon Rd Horsham Pa 19044 great schoolyard scale TRAVEL AIR 6000 020 power 36span 12 channel RIC tree flight 51495