TfliC ins piano iosen Cessna 310 started authors InvestigatIon glitch problem found Its long wires heavy-duty servos Sad say met early fate says will rebuilt fly again Previous solutions just didnt job him dreaded glitch has caused gray hairs worse RCfliersthan practicallyanything else Justwhen seemed problems radio systems solved ugly glitch seems have reared its head big models having long wires heavy-duty servos month author discusses previous solutions next month will construction article device author describes ultimate solution Part 1 EJoe Utasi B B HAVING BUILT first really large air craft Nosen Cessna 310 finally exposed some problems begin crop up using long wires heavy-duty servos airplanes may serious hazard model environs glitch occurs article will deal experi ences ideas suggested just about major source RC hobby personal laymans interpretation whats really going second part will present ultimate solution problems often crop up large aircraft fairly complex airborne sys tems especially lots long wires First little bit discussion about used cope noise back old days may help bring newcomers up speed Just decade ago flew equipment very prone electrical noise techniques used back have forgottenthey no longer used because radio manufacturers have found ways making radio systems ignore noise listen radio signals coming transmitter biggest culprits back old days metal-to-metal noise gen erated two pieces metal vibrat ing against other metal type didnt matter could steel aluminum brass anything capabe carrying electrical current turns out ly real way get rid kind noise drilling small holes piece offending mechanism con necting piece together small length flexible wire generally cured problem some rare cases necessary run ground wire piece metal air craft over negative side receiver battery hardly see done anymore might worth remembering up against stubborn glitch just wont go away would especially true happen us ing all-metal retract-gear mechanism Another area doesnt get much concern today battery pack Weve lulled false security about batteries since technology has im proved True take care charge maintain properly really take care isolate air craft vibration seems battery pack usually last concern building aircraft tends end up just get ting stuck in convenient open area thats left fuselage Usually theres just quite enough room get 36Model Aviation Left Schematic typical signal buffer used boost signal level servos well keep noise signal line backing up receiver capacitors optional providing power supply decoupling slowdown signal edges prevent signal radiation Right Schematic typical choke setup used quite frequently sometimes used capacitor author says probably better left Present-day Radio Control systems operate normal-size planes very well modifications really good layer foam padding around either cram anyway compress foam use some thin ner foam worse yet no foam Sure seems work OK may have 150 flights airplane setup suddenly starts go ing wild pilot begins aint got dance maybe its battery finally gave up farm Think about Another area thats taken granted receiver antenna Some us still remember old days try position antenna away servo motors battery wiring like should others dont seem care What heck its got plenty ground range right Wrong What works ground doesnt always work air once its up its too late change mind move antenna best policy keep antenna far away jossible anything elec trical metallic aircraft Usually means straight run top fuselage back top fin small rubberband will maintain tension keep antenna nice straight Remember antenna length criti cal tuning receiver should kept straight possible run ning solid music wire pushrods tail using wire cable systems another caveat should heeded wire lengths controls close same length antenna sometimes strange things can happen radio system situations like few things can done During planning stages long control cable runs should broken randomly once per run wood plastic insulating connec tor some sort theory will prevent electrical resonances~ might upset radio system plane already built youve just discovered glitch problem best alternative would give vertical whip antenna try simply piece music wire solder receiver antenna course would remove length wire antenna equal length music wire Ive told some newer 1991 receiver designs especially touchy about antenna position whip antenna sure way get reliable opera tion back Kraft offering whip accessory its radio system may still available cant hurt may save plane What about chokes Im sure now youve probably heard other fliers talking about chokes helped hurt particular installation old days used put chokes power leads keep RF picked up wiring backing up receiver causing havoc Well size servos being used todays larger aircraft high currents have pass through wiring puttiig chokes power leads out question Nonetheless gave try being sure use choke capable car rying current seemed harm good chokes power lead just waving transmit ter antenna near aircraft would drive system wild dont have really good explanation really happened next place see chokes being used some degree success signal lead servos being fed long wiring rally choke will range size 100 microhenries 100 millihenries Futaba also recommends capacitor 001 microfarads ground servo side choke Ive tried didnt cause problems used airplane theory behind approach servo motor can generate current spikes electrical noise passed signal lead wire harness noise tends upset decoder kind interference can recog nized glitches channel long leads well sometimes next channel pulse train Unfortunately usually aileron channel has long leads causes aileron glitches next channel line usually elevator two strikes against odds against saving plane getting analyze problem pretty slim very fortunate managed get Cessna back ground eight times harm trying make sense out whole glitch phenome non bottom line chokes signal lead can help some situations Another popular curer glitches resulting long leads use shielded wire Typically 22 gauge three-conductor shielded wire shield grounded negative side battery receiver end February 198537 4049V4SignalSignal signal in100 uHenries Gnd4 Choke hookup Signal Buffer APPROX 6 oz per revolution HAND CRANKED FOR SAFE RELIABLE USE SIX SHOOTER FUEL PUMP NOW AVAILABLE FOR GASOLINE & DIESEL FUEL EITHER VERSION $1095 THE ONLY PUMP AVAILABLE FOR USE WITH DIESEL FUEL SEE YOUR DEALER OR DISTRIBUTOR DAVE BROWN PRODUCTS 4560 LAYHIGH RD HAMILTON OH 45013513 735-1576 cable extra connectors needed tween receiver servo use fourpin Deans carry through shield connection way out servo As see shielded approach would make sense cause problem some sort RF interference getting system either power signal lines fly near airports high tension lines microwave towers shielded cables might help avoid prob lems cure-all see problem caused noisy servo motor current spikes being radiated down power lines shielded cable will contain noise within shield will still get back receiver isthe base authorswhipantenna installation Since wire has stiff enough stand up straight too much actual whipping sturdy base needed uses drilled-out 6-32 screw 1/16-in wire soldered hole antenna wire lead soldered blind nut problem whip tenna cant lay fuselage its top anymore youll break antenna can avoid some prob lems before happen Well youve ever heard saying get what pay youre halfway truth larger aircraft especially just doesnt pay cheap servos batteries other equipment such large cash investment rest project possible try stick newer servos feature coreless motors characteristically use less current especially start-up motor first starts move Furthermore coreless motors generate far less trash standard ones can still use stan dard servos throttle retract operation bomb drop such Better yet just save AO 60-size airplanes have proven work well over years Which better AM FM PCM personally fly FM pros cons type Supposedly FM gives Continued page 130 9995 Add $500 shipping Rolled Plans $2000 Add $300 Shippngj Texas residents add 51 25% Designed Turnaround Pattern 1J5 FThILENC__ MODE C5AF P0 Box 1902 Greenv lie TX 75401 214454-6441 Seed SASI 5. P.4 P4cc Let Price 2995 I- V_______________ Miter Master Mite Mast, tool designed enable crafts man make perfect joints wood accurately sanding pre-setangles TlresquaringfencejAj allomsforprecisegO angles retracts below surface Any angle can beset triangular guide using adjacent side complement angle mill funned making invaluable truss construction new cyanoacrylate adhesives require accurately fitted joints achieve fulf strength Miter Master mill enable make theni easrly FOURMOST PRODUCTS 4040 24th Ave Forest Grove OR 97116 Radio Technique/Myers Continued page 127 some patch cords salvaged old piece test gear being discarded might have buy somewhere Radio Shack offers several options cluding GR plugs thats no problem prefer unit has wire stand back case holds con venient viewing angle made characteristic Accu-Tach 2 dont like its long settling time uses five seconds reach its final reading accustomed instantaneous response dArsenval meter five seconds seems like very long time other hand delay really isnt critical unless trying trap some transient phenomenon trying probably should using oscilloscope strip-chart recorder Till meet again George M Myers 70 Froehlich Farm Rd. Hicksville NY 11801 friendly Price $950 Assemsleo booed 503 357-2732 AMA Frequency Committee Chairman PS know friendly District Frequency Coordinator Are having interference problems Tell him DFC about 0MM Glitch Buster/Utasi Continued page 38 little bit better noise immunity especial ly metal-to- ictal noise Thats see Helicopter pilots using FM AM fine too What dont see discussed anywhere AM receiver design has less noise front-end circuitry Most certainly new narrow-band designs first-rate offer good selectivity sensitivity around good performance Trouble someone frequency turns its over tears FM really lucky might just get someone turns antenna down signal still keeps receiver captured seems Im never lucky Maybe luck better us can afford PCM system Contrary popular belief someone frequency turns will still crash likely difference crash interference weak inter mittent system may able read between lines maintain con trol although response may seem slow sluggish interference serious constant receiver may go fail-safe mode servos move predetermined position flying Buzzard Bombshell some other Old-Timer may fine youre flying 30-lb ship 5 hp neutral stability Id head cover way pay money take chances could afford Id fly PCM about different glitch stop gadgets available Basically devices consist signal buffers made logic device called buffer inverter boosts signal strength servo presents noise signal line getting back decoder cases devices trick unless have serious problem Another good item helps solve problems system allows use separate battery packs powering receiver servos RAM has such product market goes long way toward cleaning up lots problems created long leads noisy servo motors cases switching sepa rate battery packs receiver ser vos will completely eradicate glitch problems Its little extra wiring re quires some extra patience results well worth Finally get hear something really new After spending about two days phone long distance calls uncovered new theory about long leads glitches comes long-time RF expert has designed some popu lar radios around today seems days receiver designs use what re ferred single-ended front end Continued page 132 Specifications Wing Area 1500 sq Span 7-2 Weight 20-25 lbs Engine 20-37 Fuselage Formers/Planking Wing Foam 3/32 Sheeting Stab Fin Solid Sheet Clear Canopy/All Balsa Major Decals Included Kit I99~ Sure winner ScaleOH Residents add 6 % tan Send $100 complete catalogueVideo Tapes 0-130 B-29 also available VHS BETA $2995 RIO Mfg 706 Easton NE North Canton OH 44721 216-499-5323 130Model Aviation NEW FOURMOST PRODUCTS FUSELAGE FIXTURE FOURMOST FUSELAGE FIXTURE designed Aadeantically align fuselage structures built strings measuring eveballing Simply slide tour centering brackets track until align firewall tail joint two bulkheads Clamp hselagetogetherlightly mith rubberbands structure will straight track New 1/5 Scale Sea Fury Beautiful Stable Flyer Capable AllAerobatlc C Yes invited So joIn National Soaring Society OFFICIAL SOARING SPECIAL INTERFET GROUP YEARLY NATIONAL TOURNAMENTS NATION-WIDE EXCELLENCE AWARDS PRoGRAM C EXCELLENT al-MONTHLY NEWSLETTER NSS CONTRIBUTES SUBSTANTIAL AMOUNTS TO EACH F3B SOARING TEAM NES IS RESPONSIBLE FOR THE ORGANIZATION AND OVERSEEING OF AMA NATS INCLUDING AWARDS BANOUET YEARLY DUES ARE $1200 ISPECIAL FAMILY RATES NSS OFFICERS ARE FROM ALL 11 DISTRICTS lor Information Contscts JOHN R VOGEL 90k ORCHARD PARK DR GISSONIA PA 15044 Put simply just have wire coming receiver call antenna Think about minute just about other kind antenna exists dipole double-sided antenna Look TV antenna up roof rabbit ears top set CB antennas balanced maxi mum performance arent dipoles usually use ground plane electrically creates mirror image top part antenna ends up being balanced RC systems dont have nice metal hood act ground plane have circuitry receiver small amount wiring weve beome used small installations begin add substantial amounts wiring airborne system critical balance airborne system upset tending invite sorts unexplainable glitches using sep arate battery packs receiver servos wont cure imbalance weve created adding wires because have common ground connection tween battery packs wir ing still tied together can get away problem solution really obvious especial ly after youve spent about month tear ing hair Out looking Simply stated will completely isolate flight control system receiver accomplished using optical couplers use infrared light transfer signal receiver airborne system addition separate battery pack will used power servo system Furthermore after optical isolation will follow up signal buffer described earlier Thus have no connection between receiver servos wiring servo battery pack total complete isolation plus signal buffering Tune next month full construc tion article real glitch buster RC Scale/Wischers Continued page 41 present some relaxed fly ing pressure number par ticipants varies year year 1984 low point recent memory 110 registered modelers Any time Bob Nelitz brings out new airplane commands instant atten tion K-W recent effort placed display aerobatic clippedwing Taylorcraft A-scale Quadra 50cc engine As usual T-craft completely detailed including cock pit external fasteners fit tings wing struts landing gear engine cowl faithfully reproduced size rib stitching rib tapes correct-size pinked serrations interi work art Instruments controls upholstery internal tube structure easily seen through large areas plexiglass covering material light weight Ceconite finished Randolph butyrate dope prototype Dur ing time Bobs T-craft display constantly surrounded admirers Anyone has seen famous J-3 Cub DH Chipmunk may find hard believe could over shadowed T-craft must con sidered best work 30 lb weight Quadra doesnt really have easy time duplicating full-size aerobatics Prop changes may improve vertical maneuvers another Nelitz coming along father Bobs footsteps Brian Nelitz won three trophies FF Scale 1984 Nats Both days Kitchener-Waterloo Scale Rally afflicted strong wind blowing toward spectator line make landings awkward everyone willing fly situation flew could have air selves anytime rare ral ly long waits frequency pin normal expected Flying wind can lead some unanticipated surprises Jim Messer fell victim avoid being swept too far down wind made sudden steeply-banked turn quarter-scale Bristol Scout lower wing failed model descended rain parts torn fabric Quadra engine destroyed Jim has reputation Quadra mechanic wont surprised see repaired member STARS Club Olean NY foremost Scale organizations US well represented K-W group has rating system awarding crash points spent happy hour two argument value Jima rrassing mishap strongly suspect given maximum award though may have hidden damage inside wing previous hard landing always think sud denly-applied up-elevator control sharp turn can cause stall second thought can also result severe struc tural damage Flying Dutchmen Club flying field located park near Kitchener campground alongside nearly filled Friday Saturday nights Entertain ment stay corn roast movies highlights K-W Rally arrival STARS group avid Scale fliers Olean trailer loads airplanes large models powered engines Quadra type mixture includes Boeing P-26 four Bristol Scouts now three deHavilland DH-2 Ercoupe Cur tiss Hawk Falcon Fokker D-VIII form centerpiece model lineup sun shade surrounded model squadron Another regulars K-W Dick Speidel airplanes scratch-built Bucker Jungmeister AT-6 Ziroli fiberglass fuselage 4 cu Hornet engine Other regulars Cliff Tacie A-scale clipped-wing Piper Cub Gemini twin-powered Steve Gray DH 86B four-engine Rapide Express Overpropped model weight kept minimum benefit generally goes unrecognized using large-diameter propeller engine rpm can reduced about half fuel con sumption also proportionately less Power also less course power remaining providing propeller ef ficiency compensates power loss other words benefit great loss smaller prop moves small132Model Aviation FULL LINE METAL SPECIALISTS
Edition: Model Aviation - 1985/02
Page Numbers: 36, 37, 38, 130, 132
TfliC ins piano iosen Cessna 310 started authors InvestigatIon glitch problem found Its long wires heavy-duty servos Sad say met early fate says will rebuilt fly again Previous solutions just didnt job him dreaded glitch has caused gray hairs worse RCfliersthan practicallyanything else Justwhen seemed problems radio systems solved ugly glitch seems have reared its head big models having long wires heavy-duty servos month author discusses previous solutions next month will construction article device author describes ultimate solution Part 1 EJoe Utasi B B HAVING BUILT first really large air craft Nosen Cessna 310 finally exposed some problems begin crop up using long wires heavy-duty servos airplanes may serious hazard model environs glitch occurs article will deal experi ences ideas suggested just about major source RC hobby personal laymans interpretation whats really going second part will present ultimate solution problems often crop up large aircraft fairly complex airborne sys tems especially lots long wires First little bit discussion about used cope noise back old days may help bring newcomers up speed Just decade ago flew equipment very prone electrical noise techniques used back have forgottenthey no longer used because radio manufacturers have found ways making radio systems ignore noise listen radio signals coming transmitter biggest culprits back old days metal-to-metal noise gen erated two pieces metal vibrat ing against other metal type didnt matter could steel aluminum brass anything capabe carrying electrical current turns out ly real way get rid kind noise drilling small holes piece offending mechanism con necting piece together small length flexible wire generally cured problem some rare cases necessary run ground wire piece metal air craft over negative side receiver battery hardly see done anymore might worth remembering up against stubborn glitch just wont go away would especially true happen us ing all-metal retract-gear mechanism Another area doesnt get much concern today battery pack Weve lulled false security about batteries since technology has im proved True take care charge maintain properly really take care isolate air craft vibration seems battery pack usually last concern building aircraft tends end up just get ting stuck in convenient open area thats left fuselage Usually theres just quite enough room get 36Model Aviation Left Schematic typical signal buffer used boost signal level servos well keep noise signal line backing up receiver capacitors optional providing power supply decoupling slowdown signal edges prevent signal radiation Right Schematic typical choke setup used quite frequently sometimes used capacitor author says probably better left Present-day Radio Control systems operate normal-size planes very well modifications really good layer foam padding around either cram anyway compress foam use some thin ner foam worse yet no foam Sure seems work OK may have 150 flights airplane setup suddenly starts go ing wild pilot begins aint got dance maybe its battery finally gave up farm Think about Another area thats taken granted receiver antenna Some us still remember old days try position antenna away servo motors battery wiring like should others dont seem care What heck its got plenty ground range right Wrong What works ground doesnt always work air once its up its too late change mind move antenna best policy keep antenna far away jossible anything elec trical metallic aircraft Usually means straight run top fuselage back top fin small rubberband will maintain tension keep antenna nice straight Remember antenna length criti cal tuning receiver should kept straight possible run ning solid music wire pushrods tail using wire cable systems another caveat should heeded wire lengths controls close same length antenna sometimes strange things can happen radio system situations like few things can done During planning stages long control cable runs should broken randomly once per run wood plastic insulating connec tor some sort theory will prevent electrical resonances~ might upset radio system plane already built youve just discovered glitch problem best alternative would give vertical whip antenna try simply piece music wire solder receiver antenna course would remove length wire antenna equal length music wire Ive told some newer 1991 receiver designs especially touchy about antenna position whip antenna sure way get reliable opera tion back Kraft offering whip accessory its radio system may still available cant hurt may save plane What about chokes Im sure now youve probably heard other fliers talking about chokes helped hurt particular installation old days used put chokes power leads keep RF picked up wiring backing up receiver causing havoc Well size servos being used todays larger aircraft high currents have pass through wiring puttiig chokes power leads out question Nonetheless gave try being sure use choke capable car rying current seemed harm good chokes power lead just waving transmit ter antenna near aircraft would drive system wild dont have really good explanation really happened next place see chokes being used some degree success signal lead servos being fed long wiring rally choke will range size 100 microhenries 100 millihenries Futaba also recommends capacitor 001 microfarads ground servo side choke Ive tried didnt cause problems used airplane theory behind approach servo motor can generate current spikes electrical noise passed signal lead wire harness noise tends upset decoder kind interference can recog nized glitches channel long leads well sometimes next channel pulse train Unfortunately usually aileron channel has long leads causes aileron glitches next channel line usually elevator two strikes against odds against saving plane getting analyze problem pretty slim very fortunate managed get Cessna back ground eight times harm trying make sense out whole glitch phenome non bottom line chokes signal lead can help some situations Another popular curer glitches resulting long leads use shielded wire Typically 22 gauge three-conductor shielded wire shield grounded negative side battery receiver end February 198537 4049V4SignalSignal signal in100 uHenries Gnd4 Choke hookup Signal Buffer APPROX 6 oz per revolution HAND CRANKED FOR SAFE RELIABLE USE SIX SHOOTER FUEL PUMP NOW AVAILABLE FOR GASOLINE & DIESEL FUEL EITHER VERSION $1095 THE ONLY PUMP AVAILABLE FOR USE WITH DIESEL FUEL SEE YOUR DEALER OR DISTRIBUTOR DAVE BROWN PRODUCTS 4560 LAYHIGH RD HAMILTON OH 45013513 735-1576 cable extra connectors needed tween receiver servo use fourpin Deans carry through shield connection way out servo As see shielded approach would make sense cause problem some sort RF interference getting system either power signal lines fly near airports high tension lines microwave towers shielded cables might help avoid prob lems cure-all see problem caused noisy servo motor current spikes being radiated down power lines shielded cable will contain noise within shield will still get back receiver isthe base authorswhipantenna installation Since wire has stiff enough stand up straight too much actual whipping sturdy base needed uses drilled-out 6-32 screw 1/16-in wire soldered hole antenna wire lead soldered blind nut problem whip tenna cant lay fuselage its top anymore youll break antenna can avoid some prob lems before happen Well youve ever heard saying get what pay youre halfway truth larger aircraft especially just doesnt pay cheap servos batteries other equipment such large cash investment rest project possible try stick newer servos feature coreless motors characteristically use less current especially start-up motor first starts move Furthermore coreless motors generate far less trash standard ones can still use stan dard servos throttle retract operation bomb drop such Better yet just save AO 60-size airplanes have proven work well over years Which better AM FM PCM personally fly FM pros cons type Supposedly FM gives Continued page 130 9995 Add $500 shipping Rolled Plans $2000 Add $300 Shippngj Texas residents add 51 25% Designed Turnaround Pattern 1J5 FThILENC__ MODE C5AF P0 Box 1902 Greenv lie TX 75401 214454-6441 Seed SASI 5. P.4 P4cc Let Price 2995 I- V_______________ Miter Master Mite Mast, tool designed enable crafts man make perfect joints wood accurately sanding pre-setangles TlresquaringfencejAj allomsforprecisegO angles retracts below surface Any angle can beset triangular guide using adjacent side complement angle mill funned making invaluable truss construction new cyanoacrylate adhesives require accurately fitted joints achieve fulf strength Miter Master mill enable make theni easrly FOURMOST PRODUCTS 4040 24th Ave Forest Grove OR 97116 Radio Technique/Myers Continued page 127 some patch cords salvaged old piece test gear being discarded might have buy somewhere Radio Shack offers several options cluding GR plugs thats no problem prefer unit has wire stand back case holds con venient viewing angle made characteristic Accu-Tach 2 dont like its long settling time uses five seconds reach its final reading accustomed instantaneous response dArsenval meter five seconds seems like very long time other hand delay really isnt critical unless trying trap some transient phenomenon trying probably should using oscilloscope strip-chart recorder Till meet again George M Myers 70 Froehlich Farm Rd. Hicksville NY 11801 friendly Price $950 Assemsleo booed 503 357-2732 AMA Frequency Committee Chairman PS know friendly District Frequency Coordinator Are having interference problems Tell him DFC about 0MM Glitch Buster/Utasi Continued page 38 little bit better noise immunity especial ly metal-to- ictal noise Thats see Helicopter pilots using FM AM fine too What dont see discussed anywhere AM receiver design has less noise front-end circuitry Most certainly new narrow-band designs first-rate offer good selectivity sensitivity around good performance Trouble someone frequency turns its over tears FM really lucky might just get someone turns antenna down signal still keeps receiver captured seems Im never lucky Maybe luck better us can afford PCM system Contrary popular belief someone frequency turns will still crash likely difference crash interference weak inter mittent system may able read between lines maintain con trol although response may seem slow sluggish interference serious constant receiver may go fail-safe mode servos move predetermined position flying Buzzard Bombshell some other Old-Timer may fine youre flying 30-lb ship 5 hp neutral stability Id head cover way pay money take chances could afford Id fly PCM about different glitch stop gadgets available Basically devices consist signal buffers made logic device called buffer inverter boosts signal strength servo presents noise signal line getting back decoder cases devices trick unless have serious problem Another good item helps solve problems system allows use separate battery packs powering receiver servos RAM has such product market goes long way toward cleaning up lots problems created long leads noisy servo motors cases switching sepa rate battery packs receiver ser vos will completely eradicate glitch problems Its little extra wiring re quires some extra patience results well worth Finally get hear something really new After spending about two days phone long distance calls uncovered new theory about long leads glitches comes long-time RF expert has designed some popu lar radios around today seems days receiver designs use what re ferred single-ended front end Continued page 132 Specifications Wing Area 1500 sq Span 7-2 Weight 20-25 lbs Engine 20-37 Fuselage Formers/Planking Wing Foam 3/32 Sheeting Stab Fin Solid Sheet Clear Canopy/All Balsa Major Decals Included Kit I99~ Sure winner ScaleOH Residents add 6 % tan Send $100 complete catalogueVideo Tapes 0-130 B-29 also available VHS BETA $2995 RIO Mfg 706 Easton NE North Canton OH 44721 216-499-5323 130Model Aviation NEW FOURMOST PRODUCTS FUSELAGE FIXTURE FOURMOST FUSELAGE FIXTURE designed Aadeantically align fuselage structures built strings measuring eveballing Simply slide tour centering brackets track until align firewall tail joint two bulkheads Clamp hselagetogetherlightly mith rubberbands structure will straight track New 1/5 Scale Sea Fury Beautiful Stable Flyer Capable AllAerobatlc C Yes invited So joIn National Soaring Society OFFICIAL SOARING SPECIAL INTERFET GROUP YEARLY NATIONAL TOURNAMENTS NATION-WIDE EXCELLENCE AWARDS PRoGRAM C EXCELLENT al-MONTHLY NEWSLETTER NSS CONTRIBUTES SUBSTANTIAL AMOUNTS TO EACH F3B SOARING TEAM NES IS RESPONSIBLE FOR THE ORGANIZATION AND OVERSEEING OF AMA NATS INCLUDING AWARDS BANOUET YEARLY DUES ARE $1200 ISPECIAL FAMILY RATES NSS OFFICERS ARE FROM ALL 11 DISTRICTS lor Information Contscts JOHN R VOGEL 90k ORCHARD PARK DR GISSONIA PA 15044 Put simply just have wire coming receiver call antenna Think about minute just about other kind antenna exists dipole double-sided antenna Look TV antenna up roof rabbit ears top set CB antennas balanced maxi mum performance arent dipoles usually use ground plane electrically creates mirror image top part antenna ends up being balanced RC systems dont have nice metal hood act ground plane have circuitry receiver small amount wiring weve beome used small installations begin add substantial amounts wiring airborne system critical balance airborne system upset tending invite sorts unexplainable glitches using sep arate battery packs receiver servos wont cure imbalance weve created adding wires because have common ground connection tween battery packs wir ing still tied together can get away problem solution really obvious especial ly after youve spent about month tear ing hair Out looking Simply stated will completely isolate flight control system receiver accomplished using optical couplers use infrared light transfer signal receiver airborne system addition separate battery pack will used power servo system Furthermore after optical isolation will follow up signal buffer described earlier Thus have no connection between receiver servos wiring servo battery pack total complete isolation plus signal buffering Tune next month full construc tion article real glitch buster RC Scale/Wischers Continued page 41 present some relaxed fly ing pressure number par ticipants varies year year 1984 low point recent memory 110 registered modelers Any time Bob Nelitz brings out new airplane commands instant atten tion K-W recent effort placed display aerobatic clippedwing Taylorcraft A-scale Quadra 50cc engine As usual T-craft completely detailed including cock pit external fasteners fit tings wing struts landing gear engine cowl faithfully reproduced size rib stitching rib tapes correct-size pinked serrations interi work art Instruments controls upholstery internal tube structure easily seen through large areas plexiglass covering material light weight Ceconite finished Randolph butyrate dope prototype Dur ing time Bobs T-craft display constantly surrounded admirers Anyone has seen famous J-3 Cub DH Chipmunk may find hard believe could over shadowed T-craft must con sidered best work 30 lb weight Quadra doesnt really have easy time duplicating full-size aerobatics Prop changes may improve vertical maneuvers another Nelitz coming along father Bobs footsteps Brian Nelitz won three trophies FF Scale 1984 Nats Both days Kitchener-Waterloo Scale Rally afflicted strong wind blowing toward spectator line make landings awkward everyone willing fly situation flew could have air selves anytime rare ral ly long waits frequency pin normal expected Flying wind can lead some unanticipated surprises Jim Messer fell victim avoid being swept too far down wind made sudden steeply-banked turn quarter-scale Bristol Scout lower wing failed model descended rain parts torn fabric Quadra engine destroyed Jim has reputation Quadra mechanic wont surprised see repaired member STARS Club Olean NY foremost Scale organizations US well represented K-W group has rating system awarding crash points spent happy hour two argument value Jima rrassing mishap strongly suspect given maximum award though may have hidden damage inside wing previous hard landing always think sud denly-applied up-elevator control sharp turn can cause stall second thought can also result severe struc tural damage Flying Dutchmen Club flying field located park near Kitchener campground alongside nearly filled Friday Saturday nights Entertain ment stay corn roast movies highlights K-W Rally arrival STARS group avid Scale fliers Olean trailer loads airplanes large models powered engines Quadra type mixture includes Boeing P-26 four Bristol Scouts now three deHavilland DH-2 Ercoupe Cur tiss Hawk Falcon Fokker D-VIII form centerpiece model lineup sun shade surrounded model squadron Another regulars K-W Dick Speidel airplanes scratch-built Bucker Jungmeister AT-6 Ziroli fiberglass fuselage 4 cu Hornet engine Other regulars Cliff Tacie A-scale clipped-wing Piper Cub Gemini twin-powered Steve Gray DH 86B four-engine Rapide Express Overpropped model weight kept minimum benefit generally goes unrecognized using large-diameter propeller engine rpm can reduced about half fuel con sumption also proportionately less Power also less course power remaining providing propeller ef ficiency compensates power loss other words benefit great loss smaller prop moves small132Model Aviation FULL LINE METAL SPECIALISTS
Edition: Model Aviation - 1985/02
Page Numbers: 36, 37, 38, 130, 132
TfliC ins piano iosen Cessna 310 started authors InvestigatIon glitch problem found Its long wires heavy-duty servos Sad say met early fate says will rebuilt fly again Previous solutions just didnt job him dreaded glitch has caused gray hairs worse RCfliersthan practicallyanything else Justwhen seemed problems radio systems solved ugly glitch seems have reared its head big models having long wires heavy-duty servos month author discusses previous solutions next month will construction article device author describes ultimate solution Part 1 EJoe Utasi B B HAVING BUILT first really large air craft Nosen Cessna 310 finally exposed some problems begin crop up using long wires heavy-duty servos airplanes may serious hazard model environs glitch occurs article will deal experi ences ideas suggested just about major source RC hobby personal laymans interpretation whats really going second part will present ultimate solution problems often crop up large aircraft fairly complex airborne sys tems especially lots long wires First little bit discussion about used cope noise back old days may help bring newcomers up speed Just decade ago flew equipment very prone electrical noise techniques used back have forgottenthey no longer used because radio manufacturers have found ways making radio systems ignore noise listen radio signals coming transmitter biggest culprits back old days metal-to-metal noise gen erated two pieces metal vibrat ing against other metal type didnt matter could steel aluminum brass anything capabe carrying electrical current turns out ly real way get rid kind noise drilling small holes piece offending mechanism con necting piece together small length flexible wire generally cured problem some rare cases necessary run ground wire piece metal air craft over negative side receiver battery hardly see done anymore might worth remembering up against stubborn glitch just wont go away would especially true happen us ing all-metal retract-gear mechanism Another area doesnt get much concern today battery pack Weve lulled false security about batteries since technology has im proved True take care charge maintain properly really take care isolate air craft vibration seems battery pack usually last concern building aircraft tends end up just get ting stuck in convenient open area thats left fuselage Usually theres just quite enough room get 36Model Aviation Left Schematic typical signal buffer used boost signal level servos well keep noise signal line backing up receiver capacitors optional providing power supply decoupling slowdown signal edges prevent signal radiation Right Schematic typical choke setup used quite frequently sometimes used capacitor author says probably better left Present-day Radio Control systems operate normal-size planes very well modifications really good layer foam padding around either cram anyway compress foam use some thin ner foam worse yet no foam Sure seems work OK may have 150 flights airplane setup suddenly starts go ing wild pilot begins aint got dance maybe its battery finally gave up farm Think about Another area thats taken granted receiver antenna Some us still remember old days try position antenna away servo motors battery wiring like should others dont seem care What heck its got plenty ground range right Wrong What works ground doesnt always work air once its up its too late change mind move antenna best policy keep antenna far away jossible anything elec trical metallic aircraft Usually means straight run top fuselage back top fin small rubberband will maintain tension keep antenna nice straight Remember antenna length criti cal tuning receiver should kept straight possible run ning solid music wire pushrods tail using wire cable systems another caveat should heeded wire lengths controls close same length antenna sometimes strange things can happen radio system situations like few things can done During planning stages long control cable runs should broken randomly once per run wood plastic insulating connec tor some sort theory will prevent electrical resonances~ might upset radio system plane already built youve just discovered glitch problem best alternative would give vertical whip antenna try simply piece music wire solder receiver antenna course would remove length wire antenna equal length music wire Ive told some newer 1991 receiver designs especially touchy about antenna position whip antenna sure way get reliable opera tion back Kraft offering whip accessory its radio system may still available cant hurt may save plane What about chokes Im sure now youve probably heard other fliers talking about chokes helped hurt particular installation old days used put chokes power leads keep RF picked up wiring backing up receiver causing havoc Well size servos being used todays larger aircraft high currents have pass through wiring puttiig chokes power leads out question Nonetheless gave try being sure use choke capable car rying current seemed harm good chokes power lead just waving transmit ter antenna near aircraft would drive system wild dont have really good explanation really happened next place see chokes being used some degree success signal lead servos being fed long wiring rally choke will range size 100 microhenries 100 millihenries Futaba also recommends capacitor 001 microfarads ground servo side choke Ive tried didnt cause problems used airplane theory behind approach servo motor can generate current spikes electrical noise passed signal lead wire harness noise tends upset decoder kind interference can recog nized glitches channel long leads well sometimes next channel pulse train Unfortunately usually aileron channel has long leads causes aileron glitches next channel line usually elevator two strikes against odds against saving plane getting analyze problem pretty slim very fortunate managed get Cessna back ground eight times harm trying make sense out whole glitch phenome non bottom line chokes signal lead can help some situations Another popular curer glitches resulting long leads use shielded wire Typically 22 gauge three-conductor shielded wire shield grounded negative side battery receiver end February 198537 4049V4SignalSignal signal in100 uHenries Gnd4 Choke hookup Signal Buffer APPROX 6 oz per revolution HAND CRANKED FOR SAFE RELIABLE USE SIX SHOOTER FUEL PUMP NOW AVAILABLE FOR GASOLINE & DIESEL FUEL EITHER VERSION $1095 THE ONLY PUMP AVAILABLE FOR USE WITH DIESEL FUEL SEE YOUR DEALER OR DISTRIBUTOR DAVE BROWN PRODUCTS 4560 LAYHIGH RD HAMILTON OH 45013513 735-1576 cable extra connectors needed tween receiver servo use fourpin Deans carry through shield connection way out servo As see shielded approach would make sense cause problem some sort RF interference getting system either power signal lines fly near airports high tension lines microwave towers shielded cables might help avoid prob lems cure-all see problem caused noisy servo motor current spikes being radiated down power lines shielded cable will contain noise within shield will still get back receiver isthe base authorswhipantenna installation Since wire has stiff enough stand up straight too much actual whipping sturdy base needed uses drilled-out 6-32 screw 1/16-in wire soldered hole antenna wire lead soldered blind nut problem whip tenna cant lay fuselage its top anymore youll break antenna can avoid some prob lems before happen Well youve ever heard saying get what pay youre halfway truth larger aircraft especially just doesnt pay cheap servos batteries other equipment such large cash investment rest project possible try stick newer servos feature coreless motors characteristically use less current especially start-up motor first starts move Furthermore coreless motors generate far less trash standard ones can still use stan dard servos throttle retract operation bomb drop such Better yet just save AO 60-size airplanes have proven work well over years Which better AM FM PCM personally fly FM pros cons type Supposedly FM gives Continued page 130 9995 Add $500 shipping Rolled Plans $2000 Add $300 Shippngj Texas residents add 51 25% Designed Turnaround Pattern 1J5 FThILENC__ MODE C5AF P0 Box 1902 Greenv lie TX 75401 214454-6441 Seed SASI 5. P.4 P4cc Let Price 2995 I- V_______________ Miter Master Mite Mast, tool designed enable crafts man make perfect joints wood accurately sanding pre-setangles TlresquaringfencejAj allomsforprecisegO angles retracts below surface Any angle can beset triangular guide using adjacent side complement angle mill funned making invaluable truss construction new cyanoacrylate adhesives require accurately fitted joints achieve fulf strength Miter Master mill enable make theni easrly FOURMOST PRODUCTS 4040 24th Ave Forest Grove OR 97116 Radio Technique/Myers Continued page 127 some patch cords salvaged old piece test gear being discarded might have buy somewhere Radio Shack offers several options cluding GR plugs thats no problem prefer unit has wire stand back case holds con venient viewing angle made characteristic Accu-Tach 2 dont like its long settling time uses five seconds reach its final reading accustomed instantaneous response dArsenval meter five seconds seems like very long time other hand delay really isnt critical unless trying trap some transient phenomenon trying probably should using oscilloscope strip-chart recorder Till meet again George M Myers 70 Froehlich Farm Rd. Hicksville NY 11801 friendly Price $950 Assemsleo booed 503 357-2732 AMA Frequency Committee Chairman PS know friendly District Frequency Coordinator Are having interference problems Tell him DFC about 0MM Glitch Buster/Utasi Continued page 38 little bit better noise immunity especial ly metal-to- ictal noise Thats see Helicopter pilots using FM AM fine too What dont see discussed anywhere AM receiver design has less noise front-end circuitry Most certainly new narrow-band designs first-rate offer good selectivity sensitivity around good performance Trouble someone frequency turns its over tears FM really lucky might just get someone turns antenna down signal still keeps receiver captured seems Im never lucky Maybe luck better us can afford PCM system Contrary popular belief someone frequency turns will still crash likely difference crash interference weak inter mittent system may able read between lines maintain con trol although response may seem slow sluggish interference serious constant receiver may go fail-safe mode servos move predetermined position flying Buzzard Bombshell some other Old-Timer may fine youre flying 30-lb ship 5 hp neutral stability Id head cover way pay money take chances could afford Id fly PCM about different glitch stop gadgets available Basically devices consist signal buffers made logic device called buffer inverter boosts signal strength servo presents noise signal line getting back decoder cases devices trick unless have serious problem Another good item helps solve problems system allows use separate battery packs powering receiver servos RAM has such product market goes long way toward cleaning up lots problems created long leads noisy servo motors cases switching sepa rate battery packs receiver ser vos will completely eradicate glitch problems Its little extra wiring re quires some extra patience results well worth Finally get hear something really new After spending about two days phone long distance calls uncovered new theory about long leads glitches comes long-time RF expert has designed some popu lar radios around today seems days receiver designs use what re ferred single-ended front end Continued page 132 Specifications Wing Area 1500 sq Span 7-2 Weight 20-25 lbs Engine 20-37 Fuselage Formers/Planking Wing Foam 3/32 Sheeting Stab Fin Solid Sheet Clear Canopy/All Balsa Major Decals Included Kit I99~ Sure winner ScaleOH Residents add 6 % tan Send $100 complete catalogueVideo Tapes 0-130 B-29 also available VHS BETA $2995 RIO Mfg 706 Easton NE North Canton OH 44721 216-499-5323 130Model Aviation NEW FOURMOST PRODUCTS FUSELAGE FIXTURE FOURMOST FUSELAGE FIXTURE designed Aadeantically align fuselage structures built strings measuring eveballing Simply slide tour centering brackets track until align firewall tail joint two bulkheads Clamp hselagetogetherlightly mith rubberbands structure will straight track New 1/5 Scale Sea Fury Beautiful Stable Flyer Capable AllAerobatlc C Yes invited So joIn National Soaring Society OFFICIAL SOARING SPECIAL INTERFET GROUP YEARLY NATIONAL TOURNAMENTS NATION-WIDE EXCELLENCE AWARDS PRoGRAM C EXCELLENT al-MONTHLY NEWSLETTER NSS CONTRIBUTES SUBSTANTIAL AMOUNTS TO EACH F3B SOARING TEAM NES IS RESPONSIBLE FOR THE ORGANIZATION AND OVERSEEING OF AMA NATS INCLUDING AWARDS BANOUET YEARLY DUES ARE $1200 ISPECIAL FAMILY RATES NSS OFFICERS ARE FROM ALL 11 DISTRICTS lor Information Contscts JOHN R VOGEL 90k ORCHARD PARK DR GISSONIA PA 15044 Put simply just have wire coming receiver call antenna Think about minute just about other kind antenna exists dipole double-sided antenna Look TV antenna up roof rabbit ears top set CB antennas balanced maxi mum performance arent dipoles usually use ground plane electrically creates mirror image top part antenna ends up being balanced RC systems dont have nice metal hood act ground plane have circuitry receiver small amount wiring weve beome used small installations begin add substantial amounts wiring airborne system critical balance airborne system upset tending invite sorts unexplainable glitches using sep arate battery packs receiver servos wont cure imbalance weve created adding wires because have common ground connection tween battery packs wir ing still tied together can get away problem solution really obvious especial ly after youve spent about month tear ing hair Out looking Simply stated will completely isolate flight control system receiver accomplished using optical couplers use infrared light transfer signal receiver airborne system addition separate battery pack will used power servo system Furthermore after optical isolation will follow up signal buffer described earlier Thus have no connection between receiver servos wiring servo battery pack total complete isolation plus signal buffering Tune next month full construc tion article real glitch buster RC Scale/Wischers Continued page 41 present some relaxed fly ing pressure number par ticipants varies year year 1984 low point recent memory 110 registered modelers Any time Bob Nelitz brings out new airplane commands instant atten tion K-W recent effort placed display aerobatic clippedwing Taylorcraft A-scale Quadra 50cc engine As usual T-craft completely detailed including cock pit external fasteners fit tings wing struts landing gear engine cowl faithfully reproduced size rib stitching rib tapes correct-size pinked serrations interi work art Instruments controls upholstery internal tube structure easily seen through large areas plexiglass covering material light weight Ceconite finished Randolph butyrate dope prototype Dur ing time Bobs T-craft display constantly surrounded admirers Anyone has seen famous J-3 Cub DH Chipmunk may find hard believe could over shadowed T-craft must con sidered best work 30 lb weight Quadra doesnt really have easy time duplicating full-size aerobatics Prop changes may improve vertical maneuvers another Nelitz coming along father Bobs footsteps Brian Nelitz won three trophies FF Scale 1984 Nats Both days Kitchener-Waterloo Scale Rally afflicted strong wind blowing toward spectator line make landings awkward everyone willing fly situation flew could have air selves anytime rare ral ly long waits frequency pin normal expected Flying wind can lead some unanticipated surprises Jim Messer fell victim avoid being swept too far down wind made sudden steeply-banked turn quarter-scale Bristol Scout lower wing failed model descended rain parts torn fabric Quadra engine destroyed Jim has reputation Quadra mechanic wont surprised see repaired member STARS Club Olean NY foremost Scale organizations US well represented K-W group has rating system awarding crash points spent happy hour two argument value Jima rrassing mishap strongly suspect given maximum award though may have hidden damage inside wing previous hard landing always think sud denly-applied up-elevator control sharp turn can cause stall second thought can also result severe struc tural damage Flying Dutchmen Club flying field located park near Kitchener campground alongside nearly filled Friday Saturday nights Entertain ment stay corn roast movies highlights K-W Rally arrival STARS group avid Scale fliers Olean trailer loads airplanes large models powered engines Quadra type mixture includes Boeing P-26 four Bristol Scouts now three deHavilland DH-2 Ercoupe Cur tiss Hawk Falcon Fokker D-VIII form centerpiece model lineup sun shade surrounded model squadron Another regulars K-W Dick Speidel airplanes scratch-built Bucker Jungmeister AT-6 Ziroli fiberglass fuselage 4 cu Hornet engine Other regulars Cliff Tacie A-scale clipped-wing Piper Cub Gemini twin-powered Steve Gray DH 86B four-engine Rapide Express Overpropped model weight kept minimum benefit generally goes unrecognized using large-diameter propeller engine rpm can reduced about half fuel con sumption also proportionately less Power also less course power remaining providing propeller ef ficiency compensates power loss other words benefit great loss smaller prop moves small132Model Aviation FULL LINE METAL SPECIALISTS
Edition: Model Aviation - 1985/02
Page Numbers: 36, 37, 38, 130, 132
TfliC ins piano iosen Cessna 310 started authors InvestigatIon glitch problem found Its long wires heavy-duty servos Sad say met early fate says will rebuilt fly again Previous solutions just didnt job him dreaded glitch has caused gray hairs worse RCfliersthan practicallyanything else Justwhen seemed problems radio systems solved ugly glitch seems have reared its head big models having long wires heavy-duty servos month author discusses previous solutions next month will construction article device author describes ultimate solution Part 1 EJoe Utasi B B HAVING BUILT first really large air craft Nosen Cessna 310 finally exposed some problems begin crop up using long wires heavy-duty servos airplanes may serious hazard model environs glitch occurs article will deal experi ences ideas suggested just about major source RC hobby personal laymans interpretation whats really going second part will present ultimate solution problems often crop up large aircraft fairly complex airborne sys tems especially lots long wires First little bit discussion about used cope noise back old days may help bring newcomers up speed Just decade ago flew equipment very prone electrical noise techniques used back have forgottenthey no longer used because radio manufacturers have found ways making radio systems ignore noise listen radio signals coming transmitter biggest culprits back old days metal-to-metal noise gen erated two pieces metal vibrat ing against other metal type didnt matter could steel aluminum brass anything capabe carrying electrical current turns out ly real way get rid kind noise drilling small holes piece offending mechanism con necting piece together small length flexible wire generally cured problem some rare cases necessary run ground wire piece metal air craft over negative side receiver battery hardly see done anymore might worth remembering up against stubborn glitch just wont go away would especially true happen us ing all-metal retract-gear mechanism Another area doesnt get much concern today battery pack Weve lulled false security about batteries since technology has im proved True take care charge maintain properly really take care isolate air craft vibration seems battery pack usually last concern building aircraft tends end up just get ting stuck in convenient open area thats left fuselage Usually theres just quite enough room get 36Model Aviation Left Schematic typical signal buffer used boost signal level servos well keep noise signal line backing up receiver capacitors optional providing power supply decoupling slowdown signal edges prevent signal radiation Right Schematic typical choke setup used quite frequently sometimes used capacitor author says probably better left Present-day Radio Control systems operate normal-size planes very well modifications really good layer foam padding around either cram anyway compress foam use some thin ner foam worse yet no foam Sure seems work OK may have 150 flights airplane setup suddenly starts go ing wild pilot begins aint got dance maybe its battery finally gave up farm Think about Another area thats taken granted receiver antenna Some us still remember old days try position antenna away servo motors battery wiring like should others dont seem care What heck its got plenty ground range right Wrong What works ground doesnt always work air once its up its too late change mind move antenna best policy keep antenna far away jossible anything elec trical metallic aircraft Usually means straight run top fuselage back top fin small rubberband will maintain tension keep antenna nice straight Remember antenna length criti cal tuning receiver should kept straight possible run ning solid music wire pushrods tail using wire cable systems another caveat should heeded wire lengths controls close same length antenna sometimes strange things can happen radio system situations like few things can done During planning stages long control cable runs should broken randomly once per run wood plastic insulating connec tor some sort theory will prevent electrical resonances~ might upset radio system plane already built youve just discovered glitch problem best alternative would give vertical whip antenna try simply piece music wire solder receiver antenna course would remove length wire antenna equal length music wire Ive told some newer 1991 receiver designs especially touchy about antenna position whip antenna sure way get reliable opera tion back Kraft offering whip accessory its radio system may still available cant hurt may save plane What about chokes Im sure now youve probably heard other fliers talking about chokes helped hurt particular installation old days used put chokes power leads keep RF picked up wiring backing up receiver causing havoc Well size servos being used todays larger aircraft high currents have pass through wiring puttiig chokes power leads out question Nonetheless gave try being sure use choke capable car rying current seemed harm good chokes power lead just waving transmit ter antenna near aircraft would drive system wild dont have really good explanation really happened next place see chokes being used some degree success signal lead servos being fed long wiring rally choke will range size 100 microhenries 100 millihenries Futaba also recommends capacitor 001 microfarads ground servo side choke Ive tried didnt cause problems used airplane theory behind approach servo motor can generate current spikes electrical noise passed signal lead wire harness noise tends upset decoder kind interference can recog nized glitches channel long leads well sometimes next channel pulse train Unfortunately usually aileron channel has long leads causes aileron glitches next channel line usually elevator two strikes against odds against saving plane getting analyze problem pretty slim very fortunate managed get Cessna back ground eight times harm trying make sense out whole glitch phenome non bottom line chokes signal lead can help some situations Another popular curer glitches resulting long leads use shielded wire Typically 22 gauge three-conductor shielded wire shield grounded negative side battery receiver end February 198537 4049V4SignalSignal signal in100 uHenries Gnd4 Choke hookup Signal Buffer APPROX 6 oz per revolution HAND CRANKED FOR SAFE RELIABLE USE SIX SHOOTER FUEL PUMP NOW AVAILABLE FOR GASOLINE & DIESEL FUEL EITHER VERSION $1095 THE ONLY PUMP AVAILABLE FOR USE WITH DIESEL FUEL SEE YOUR DEALER OR DISTRIBUTOR DAVE BROWN PRODUCTS 4560 LAYHIGH RD HAMILTON OH 45013513 735-1576 cable extra connectors needed tween receiver servo use fourpin Deans carry through shield connection way out servo As see shielded approach would make sense cause problem some sort RF interference getting system either power signal lines fly near airports high tension lines microwave towers shielded cables might help avoid prob lems cure-all see problem caused noisy servo motor current spikes being radiated down power lines shielded cable will contain noise within shield will still get back receiver isthe base authorswhipantenna installation Since wire has stiff enough stand up straight too much actual whipping sturdy base needed uses drilled-out 6-32 screw 1/16-in wire soldered hole antenna wire lead soldered blind nut problem whip tenna cant lay fuselage its top anymore youll break antenna can avoid some prob lems before happen Well youve ever heard saying get what pay youre halfway truth larger aircraft especially just doesnt pay cheap servos batteries other equipment such large cash investment rest project possible try stick newer servos feature coreless motors characteristically use less current especially start-up motor first starts move Furthermore coreless motors generate far less trash standard ones can still use stan dard servos throttle retract operation bomb drop such Better yet just save AO 60-size airplanes have proven work well over years Which better AM FM PCM personally fly FM pros cons type Supposedly FM gives Continued page 130 9995 Add $500 shipping Rolled Plans $2000 Add $300 Shippngj Texas residents add 51 25% Designed Turnaround Pattern 1J5 FThILENC__ MODE C5AF P0 Box 1902 Greenv lie TX 75401 214454-6441 Seed SASI 5. P.4 P4cc Let Price 2995 I- V_______________ Miter Master Mite Mast, tool designed enable crafts man make perfect joints wood accurately sanding pre-setangles TlresquaringfencejAj allomsforprecisegO angles retracts below surface Any angle can beset triangular guide using adjacent side complement angle mill funned making invaluable truss construction new cyanoacrylate adhesives require accurately fitted joints achieve fulf strength Miter Master mill enable make theni easrly FOURMOST PRODUCTS 4040 24th Ave Forest Grove OR 97116 Radio Technique/Myers Continued page 127 some patch cords salvaged old piece test gear being discarded might have buy somewhere Radio Shack offers several options cluding GR plugs thats no problem prefer unit has wire stand back case holds con venient viewing angle made characteristic Accu-Tach 2 dont like its long settling time uses five seconds reach its final reading accustomed instantaneous response dArsenval meter five seconds seems like very long time other hand delay really isnt critical unless trying trap some transient phenomenon trying probably should using oscilloscope strip-chart recorder Till meet again George M Myers 70 Froehlich Farm Rd. Hicksville NY 11801 friendly Price $950 Assemsleo booed 503 357-2732 AMA Frequency Committee Chairman PS know friendly District Frequency Coordinator Are having interference problems Tell him DFC about 0MM Glitch Buster/Utasi Continued page 38 little bit better noise immunity especial ly metal-to- ictal noise Thats see Helicopter pilots using FM AM fine too What dont see discussed anywhere AM receiver design has less noise front-end circuitry Most certainly new narrow-band designs first-rate offer good selectivity sensitivity around good performance Trouble someone frequency turns its over tears FM really lucky might just get someone turns antenna down signal still keeps receiver captured seems Im never lucky Maybe luck better us can afford PCM system Contrary popular belief someone frequency turns will still crash likely difference crash interference weak inter mittent system may able read between lines maintain con trol although response may seem slow sluggish interference serious constant receiver may go fail-safe mode servos move predetermined position flying Buzzard Bombshell some other Old-Timer may fine youre flying 30-lb ship 5 hp neutral stability Id head cover way pay money take chances could afford Id fly PCM about different glitch stop gadgets available Basically devices consist signal buffers made logic device called buffer inverter boosts signal strength servo presents noise signal line getting back decoder cases devices trick unless have serious problem Another good item helps solve problems system allows use separate battery packs powering receiver servos RAM has such product market goes long way toward cleaning up lots problems created long leads noisy servo motors cases switching sepa rate battery packs receiver ser vos will completely eradicate glitch problems Its little extra wiring re quires some extra patience results well worth Finally get hear something really new After spending about two days phone long distance calls uncovered new theory about long leads glitches comes long-time RF expert has designed some popu lar radios around today seems days receiver designs use what re ferred single-ended front end Continued page 132 Specifications Wing Area 1500 sq Span 7-2 Weight 20-25 lbs Engine 20-37 Fuselage Formers/Planking Wing Foam 3/32 Sheeting Stab Fin Solid Sheet Clear Canopy/All Balsa Major Decals Included Kit I99~ Sure winner ScaleOH Residents add 6 % tan Send $100 complete catalogueVideo Tapes 0-130 B-29 also available VHS BETA $2995 RIO Mfg 706 Easton NE North Canton OH 44721 216-499-5323 130Model Aviation NEW FOURMOST PRODUCTS FUSELAGE FIXTURE FOURMOST FUSELAGE FIXTURE designed Aadeantically align fuselage structures built strings measuring eveballing Simply slide tour centering brackets track until align firewall tail joint two bulkheads Clamp hselagetogetherlightly mith rubberbands structure will straight track New 1/5 Scale Sea Fury Beautiful Stable Flyer Capable AllAerobatlc C Yes invited So joIn National Soaring Society OFFICIAL SOARING SPECIAL INTERFET GROUP YEARLY NATIONAL TOURNAMENTS NATION-WIDE EXCELLENCE AWARDS PRoGRAM C EXCELLENT al-MONTHLY NEWSLETTER NSS CONTRIBUTES SUBSTANTIAL AMOUNTS TO EACH F3B SOARING TEAM NES IS RESPONSIBLE FOR THE ORGANIZATION AND OVERSEEING OF AMA NATS INCLUDING AWARDS BANOUET YEARLY DUES ARE $1200 ISPECIAL FAMILY RATES NSS OFFICERS ARE FROM ALL 11 DISTRICTS lor Information Contscts JOHN R VOGEL 90k ORCHARD PARK DR GISSONIA PA 15044 Put simply just have wire coming receiver call antenna Think about minute just about other kind antenna exists dipole double-sided antenna Look TV antenna up roof rabbit ears top set CB antennas balanced maxi mum performance arent dipoles usually use ground plane electrically creates mirror image top part antenna ends up being balanced RC systems dont have nice metal hood act ground plane have circuitry receiver small amount wiring weve beome used small installations begin add substantial amounts wiring airborne system critical balance airborne system upset tending invite sorts unexplainable glitches using sep arate battery packs receiver servos wont cure imbalance weve created adding wires because have common ground connection tween battery packs wir ing still tied together can get away problem solution really obvious especial ly after youve spent about month tear ing hair Out looking Simply stated will completely isolate flight control system receiver accomplished using optical couplers use infrared light transfer signal receiver airborne system addition separate battery pack will used power servo system Furthermore after optical isolation will follow up signal buffer described earlier Thus have no connection between receiver servos wiring servo battery pack total complete isolation plus signal buffering Tune next month full construc tion article real glitch buster RC Scale/Wischers Continued page 41 present some relaxed fly ing pressure number par ticipants varies year year 1984 low point recent memory 110 registered modelers Any time Bob Nelitz brings out new airplane commands instant atten tion K-W recent effort placed display aerobatic clippedwing Taylorcraft A-scale Quadra 50cc engine As usual T-craft completely detailed including cock pit external fasteners fit tings wing struts landing gear engine cowl faithfully reproduced size rib stitching rib tapes correct-size pinked serrations interi work art Instruments controls upholstery internal tube structure easily seen through large areas plexiglass covering material light weight Ceconite finished Randolph butyrate dope prototype Dur ing time Bobs T-craft display constantly surrounded admirers Anyone has seen famous J-3 Cub DH Chipmunk may find hard believe could over shadowed T-craft must con sidered best work 30 lb weight Quadra doesnt really have easy time duplicating full-size aerobatics Prop changes may improve vertical maneuvers another Nelitz coming along father Bobs footsteps Brian Nelitz won three trophies FF Scale 1984 Nats Both days Kitchener-Waterloo Scale Rally afflicted strong wind blowing toward spectator line make landings awkward everyone willing fly situation flew could have air selves anytime rare ral ly long waits frequency pin normal expected Flying wind can lead some unanticipated surprises Jim Messer fell victim avoid being swept too far down wind made sudden steeply-banked turn quarter-scale Bristol Scout lower wing failed model descended rain parts torn fabric Quadra engine destroyed Jim has reputation Quadra mechanic wont surprised see repaired member STARS Club Olean NY foremost Scale organizations US well represented K-W group has rating system awarding crash points spent happy hour two argument value Jima rrassing mishap strongly suspect given maximum award though may have hidden damage inside wing previous hard landing always think sud denly-applied up-elevator control sharp turn can cause stall second thought can also result severe struc tural damage Flying Dutchmen Club flying field located park near Kitchener campground alongside nearly filled Friday Saturday nights Entertain ment stay corn roast movies highlights K-W Rally arrival STARS group avid Scale fliers Olean trailer loads airplanes large models powered engines Quadra type mixture includes Boeing P-26 four Bristol Scouts now three deHavilland DH-2 Ercoupe Cur tiss Hawk Falcon Fokker D-VIII form centerpiece model lineup sun shade surrounded model squadron Another regulars K-W Dick Speidel airplanes scratch-built Bucker Jungmeister AT-6 Ziroli fiberglass fuselage 4 cu Hornet engine Other regulars Cliff Tacie A-scale clipped-wing Piper Cub Gemini twin-powered Steve Gray DH 86B four-engine Rapide Express Overpropped model weight kept minimum benefit generally goes unrecognized using large-diameter propeller engine rpm can reduced about half fuel con sumption also proportionately less Power also less course power remaining providing propeller ef ficiency compensates power loss other words benefit great loss smaller prop moves small132Model Aviation FULL LINE METAL SPECIALISTS
Edition: Model Aviation - 1985/02
Page Numbers: 36, 37, 38, 130, 132
TfliC ins piano iosen Cessna 310 started authors InvestigatIon glitch problem found Its long wires heavy-duty servos Sad say met early fate says will rebuilt fly again Previous solutions just didnt job him dreaded glitch has caused gray hairs worse RCfliersthan practicallyanything else Justwhen seemed problems radio systems solved ugly glitch seems have reared its head big models having long wires heavy-duty servos month author discusses previous solutions next month will construction article device author describes ultimate solution Part 1 EJoe Utasi B B HAVING BUILT first really large air craft Nosen Cessna 310 finally exposed some problems begin crop up using long wires heavy-duty servos airplanes may serious hazard model environs glitch occurs article will deal experi ences ideas suggested just about major source RC hobby personal laymans interpretation whats really going second part will present ultimate solution problems often crop up large aircraft fairly complex airborne sys tems especially lots long wires First little bit discussion about used cope noise back old days may help bring newcomers up speed Just decade ago flew equipment very prone electrical noise techniques used back have forgottenthey no longer used because radio manufacturers have found ways making radio systems ignore noise listen radio signals coming transmitter biggest culprits back old days metal-to-metal noise gen erated two pieces metal vibrat ing against other metal type didnt matter could steel aluminum brass anything capabe carrying electrical current turns out ly real way get rid kind noise drilling small holes piece offending mechanism con necting piece together small length flexible wire generally cured problem some rare cases necessary run ground wire piece metal air craft over negative side receiver battery hardly see done anymore might worth remembering up against stubborn glitch just wont go away would especially true happen us ing all-metal retract-gear mechanism Another area doesnt get much concern today battery pack Weve lulled false security about batteries since technology has im proved True take care charge maintain properly really take care isolate air craft vibration seems battery pack usually last concern building aircraft tends end up just get ting stuck in convenient open area thats left fuselage Usually theres just quite enough room get 36Model Aviation Left Schematic typical signal buffer used boost signal level servos well keep noise signal line backing up receiver capacitors optional providing power supply decoupling slowdown signal edges prevent signal radiation Right Schematic typical choke setup used quite frequently sometimes used capacitor author says probably better left Present-day Radio Control systems operate normal-size planes very well modifications really good layer foam padding around either cram anyway compress foam use some thin ner foam worse yet no foam Sure seems work OK may have 150 flights airplane setup suddenly starts go ing wild pilot begins aint got dance maybe its battery finally gave up farm Think about Another area thats taken granted receiver antenna Some us still remember old days try position antenna away servo motors battery wiring like should others dont seem care What heck its got plenty ground range right Wrong What works ground doesnt always work air once its up its too late change mind move antenna best policy keep antenna far away jossible anything elec trical metallic aircraft Usually means straight run top fuselage back top fin small rubberband will maintain tension keep antenna nice straight Remember antenna length criti cal tuning receiver should kept straight possible run ning solid music wire pushrods tail using wire cable systems another caveat should heeded wire lengths controls close same length antenna sometimes strange things can happen radio system situations like few things can done During planning stages long control cable runs should broken randomly once per run wood plastic insulating connec tor some sort theory will prevent electrical resonances~ might upset radio system plane already built youve just discovered glitch problem best alternative would give vertical whip antenna try simply piece music wire solder receiver antenna course would remove length wire antenna equal length music wire Ive told some newer 1991 receiver designs especially touchy about antenna position whip antenna sure way get reliable opera tion back Kraft offering whip accessory its radio system may still available cant hurt may save plane What about chokes Im sure now youve probably heard other fliers talking about chokes helped hurt particular installation old days used put chokes power leads keep RF picked up wiring backing up receiver causing havoc Well size servos being used todays larger aircraft high currents have pass through wiring puttiig chokes power leads out question Nonetheless gave try being sure use choke capable car rying current seemed harm good chokes power lead just waving transmit ter antenna near aircraft would drive system wild dont have really good explanation really happened next place see chokes being used some degree success signal lead servos being fed long wiring rally choke will range size 100 microhenries 100 millihenries Futaba also recommends capacitor 001 microfarads ground servo side choke Ive tried didnt cause problems used airplane theory behind approach servo motor can generate current spikes electrical noise passed signal lead wire harness noise tends upset decoder kind interference can recog nized glitches channel long leads well sometimes next channel pulse train Unfortunately usually aileron channel has long leads causes aileron glitches next channel line usually elevator two strikes against odds against saving plane getting analyze problem pretty slim very fortunate managed get Cessna back ground eight times harm trying make sense out whole glitch phenome non bottom line chokes signal lead can help some situations Another popular curer glitches resulting long leads use shielded wire Typically 22 gauge three-conductor shielded wire shield grounded negative side battery receiver end February 198537 4049V4SignalSignal signal in100 uHenries Gnd4 Choke hookup Signal Buffer APPROX 6 oz per revolution HAND CRANKED FOR SAFE RELIABLE USE SIX SHOOTER FUEL PUMP NOW AVAILABLE FOR GASOLINE & DIESEL FUEL EITHER VERSION $1095 THE ONLY PUMP AVAILABLE FOR USE WITH DIESEL FUEL SEE YOUR DEALER OR DISTRIBUTOR DAVE BROWN PRODUCTS 4560 LAYHIGH RD HAMILTON OH 45013513 735-1576 cable extra connectors needed tween receiver servo use fourpin Deans carry through shield connection way out servo As see shielded approach would make sense cause problem some sort RF interference getting system either power signal lines fly near airports high tension lines microwave towers shielded cables might help avoid prob lems cure-all see problem caused noisy servo motor current spikes being radiated down power lines shielded cable will contain noise within shield will still get back receiver isthe base authorswhipantenna installation Since wire has stiff enough stand up straight too much actual whipping sturdy base needed uses drilled-out 6-32 screw 1/16-in wire soldered hole antenna wire lead soldered blind nut problem whip tenna cant lay fuselage its top anymore youll break antenna can avoid some prob lems before happen Well youve ever heard saying get what pay youre halfway truth larger aircraft especially just doesnt pay cheap servos batteries other equipment such large cash investment rest project possible try stick newer servos feature coreless motors characteristically use less current especially start-up motor first starts move Furthermore coreless motors generate far less trash standard ones can still use stan dard servos throttle retract operation bomb drop such Better yet just save AO 60-size airplanes have proven work well over years Which better AM FM PCM personally fly FM pros cons type Supposedly FM gives Continued page 130 9995 Add $500 shipping Rolled Plans $2000 Add $300 Shippngj Texas residents add 51 25% Designed Turnaround Pattern 1J5 FThILENC__ MODE C5AF P0 Box 1902 Greenv lie TX 75401 214454-6441 Seed SASI 5. P.4 P4cc Let Price 2995 I- V_______________ Miter Master Mite Mast, tool designed enable crafts man make perfect joints wood accurately sanding pre-setangles TlresquaringfencejAj allomsforprecisegO angles retracts below surface Any angle can beset triangular guide using adjacent side complement angle mill funned making invaluable truss construction new cyanoacrylate adhesives require accurately fitted joints achieve fulf strength Miter Master mill enable make theni easrly FOURMOST PRODUCTS 4040 24th Ave Forest Grove OR 97116 Radio Technique/Myers Continued page 127 some patch cords salvaged old piece test gear being discarded might have buy somewhere Radio Shack offers several options cluding GR plugs thats no problem prefer unit has wire stand back case holds con venient viewing angle made characteristic Accu-Tach 2 dont like its long settling time uses five seconds reach its final reading accustomed instantaneous response dArsenval meter five seconds seems like very long time other hand delay really isnt critical unless trying trap some transient phenomenon trying probably should using oscilloscope strip-chart recorder Till meet again George M Myers 70 Froehlich Farm Rd. Hicksville NY 11801 friendly Price $950 Assemsleo booed 503 357-2732 AMA Frequency Committee Chairman PS know friendly District Frequency Coordinator Are having interference problems Tell him DFC about 0MM Glitch Buster/Utasi Continued page 38 little bit better noise immunity especial ly metal-to- ictal noise Thats see Helicopter pilots using FM AM fine too What dont see discussed anywhere AM receiver design has less noise front-end circuitry Most certainly new narrow-band designs first-rate offer good selectivity sensitivity around good performance Trouble someone frequency turns its over tears FM really lucky might just get someone turns antenna down signal still keeps receiver captured seems Im never lucky Maybe luck better us can afford PCM system Contrary popular belief someone frequency turns will still crash likely difference crash interference weak inter mittent system may able read between lines maintain con trol although response may seem slow sluggish interference serious constant receiver may go fail-safe mode servos move predetermined position flying Buzzard Bombshell some other Old-Timer may fine youre flying 30-lb ship 5 hp neutral stability Id head cover way pay money take chances could afford Id fly PCM about different glitch stop gadgets available Basically devices consist signal buffers made logic device called buffer inverter boosts signal strength servo presents noise signal line getting back decoder cases devices trick unless have serious problem Another good item helps solve problems system allows use separate battery packs powering receiver servos RAM has such product market goes long way toward cleaning up lots problems created long leads noisy servo motors cases switching sepa rate battery packs receiver ser vos will completely eradicate glitch problems Its little extra wiring re quires some extra patience results well worth Finally get hear something really new After spending about two days phone long distance calls uncovered new theory about long leads glitches comes long-time RF expert has designed some popu lar radios around today seems days receiver designs use what re ferred single-ended front end Continued page 132 Specifications Wing Area 1500 sq Span 7-2 Weight 20-25 lbs Engine 20-37 Fuselage Formers/Planking Wing Foam 3/32 Sheeting Stab Fin Solid Sheet Clear Canopy/All Balsa Major Decals Included Kit I99~ Sure winner ScaleOH Residents add 6 % tan Send $100 complete catalogueVideo Tapes 0-130 B-29 also available VHS BETA $2995 RIO Mfg 706 Easton NE North Canton OH 44721 216-499-5323 130Model Aviation NEW FOURMOST PRODUCTS FUSELAGE FIXTURE FOURMOST FUSELAGE FIXTURE designed Aadeantically align fuselage structures built strings measuring eveballing Simply slide tour centering brackets track until align firewall tail joint two bulkheads Clamp hselagetogetherlightly mith rubberbands structure will straight track New 1/5 Scale Sea Fury Beautiful Stable Flyer Capable AllAerobatlc C Yes invited So joIn National Soaring Society OFFICIAL SOARING SPECIAL INTERFET GROUP YEARLY NATIONAL TOURNAMENTS NATION-WIDE EXCELLENCE AWARDS PRoGRAM C EXCELLENT al-MONTHLY NEWSLETTER NSS CONTRIBUTES SUBSTANTIAL AMOUNTS TO EACH F3B SOARING TEAM NES IS RESPONSIBLE FOR THE ORGANIZATION AND OVERSEEING OF AMA NATS INCLUDING AWARDS BANOUET YEARLY DUES ARE $1200 ISPECIAL FAMILY RATES NSS OFFICERS ARE FROM ALL 11 DISTRICTS lor Information Contscts JOHN R VOGEL 90k ORCHARD PARK DR GISSONIA PA 15044 Put simply just have wire coming receiver call antenna Think about minute just about other kind antenna exists dipole double-sided antenna Look TV antenna up roof rabbit ears top set CB antennas balanced maxi mum performance arent dipoles usually use ground plane electrically creates mirror image top part antenna ends up being balanced RC systems dont have nice metal hood act ground plane have circuitry receiver small amount wiring weve beome used small installations begin add substantial amounts wiring airborne system critical balance airborne system upset tending invite sorts unexplainable glitches using sep arate battery packs receiver servos wont cure imbalance weve created adding wires because have common ground connection tween battery packs wir ing still tied together can get away problem solution really obvious especial ly after youve spent about month tear ing hair Out looking Simply stated will completely isolate flight control system receiver accomplished using optical couplers use infrared light transfer signal receiver airborne system addition separate battery pack will used power servo system Furthermore after optical isolation will follow up signal buffer described earlier Thus have no connection between receiver servos wiring servo battery pack total complete isolation plus signal buffering Tune next month full construc tion article real glitch buster RC Scale/Wischers Continued page 41 present some relaxed fly ing pressure number par ticipants varies year year 1984 low point recent memory 110 registered modelers Any time Bob Nelitz brings out new airplane commands instant atten tion K-W recent effort placed display aerobatic clippedwing Taylorcraft A-scale Quadra 50cc engine As usual T-craft completely detailed including cock pit external fasteners fit tings wing struts landing gear engine cowl faithfully reproduced size rib stitching rib tapes correct-size pinked serrations interi work art Instruments controls upholstery internal tube structure easily seen through large areas plexiglass covering material light weight Ceconite finished Randolph butyrate dope prototype Dur ing time Bobs T-craft display constantly surrounded admirers Anyone has seen famous J-3 Cub DH Chipmunk may find hard believe could over shadowed T-craft must con sidered best work 30 lb weight Quadra doesnt really have easy time duplicating full-size aerobatics Prop changes may improve vertical maneuvers another Nelitz coming along father Bobs footsteps Brian Nelitz won three trophies FF Scale 1984 Nats Both days Kitchener-Waterloo Scale Rally afflicted strong wind blowing toward spectator line make landings awkward everyone willing fly situation flew could have air selves anytime rare ral ly long waits frequency pin normal expected Flying wind can lead some unanticipated surprises Jim Messer fell victim avoid being swept too far down wind made sudden steeply-banked turn quarter-scale Bristol Scout lower wing failed model descended rain parts torn fabric Quadra engine destroyed Jim has reputation Quadra mechanic wont surprised see repaired member STARS Club Olean NY foremost Scale organizations US well represented K-W group has rating system awarding crash points spent happy hour two argument value Jima rrassing mishap strongly suspect given maximum award though may have hidden damage inside wing previous hard landing always think sud denly-applied up-elevator control sharp turn can cause stall second thought can also result severe struc tural damage Flying Dutchmen Club flying field located park near Kitchener campground alongside nearly filled Friday Saturday nights Entertain ment stay corn roast movies highlights K-W Rally arrival STARS group avid Scale fliers Olean trailer loads airplanes large models powered engines Quadra type mixture includes Boeing P-26 four Bristol Scouts now three deHavilland DH-2 Ercoupe Cur tiss Hawk Falcon Fokker D-VIII form centerpiece model lineup sun shade surrounded model squadron Another regulars K-W Dick Speidel airplanes scratch-built Bucker Jungmeister AT-6 Ziroli fiberglass fuselage 4 cu Hornet engine Other regulars Cliff Tacie A-scale clipped-wing Piper Cub Gemini twin-powered Steve Gray DH 86B four-engine Rapide Express Overpropped model weight kept minimum benefit generally goes unrecognized using large-diameter propeller engine rpm can reduced about half fuel con sumption also proportionately less Power also less course power remaining providing propeller ef ficiency compensates power loss other words benefit great loss smaller prop moves small132Model Aviation FULL LINE METAL SPECIALISTS