George M Myers 4=== WHAT INTERFERENCE past two years have loaning out request AMA frequency monitor clubs District II know what have found Nothing havent found interference new RC channels Oh sure have found bridge tender pocket pager located old evennumbered channels 72080 72160 72240 72320 7240 7296 7564 MHz knew would happen happening before got new chan nels Thats got new channels law shouldnt inter ference new RC channels have exclusive use except interference get other modelers According small set tests have what expected know small comfort Bob Aberle observed RC real test ing-ground techniques will make cellular radio pocket pagers etc feasible stand side-by-side operate systems dont forced deal intermodulation problems can ignore intermodulation spoils thir communication have repeat last trans mission glitch crash So guess big bucks being spent Youve got it. pocket pagers cellular radios make understand RC model aviation is- best place develop new chips circuits perusing another two-inch stack newsletters receive AMA HQ time time struck frequent reprinting old June 1983 column interference column four-station flight card color apparently being cluded some Circus Hobbies radios contains well-known flaw use card should move 72080 BN/WH Red flight line Yellow flight line avoid possibility image interference Sorry about same time must point out Possible interference doesnt mean guaranteed Most clubs use com bination channels possible wonder guy Myers always talking about interference never have any~ check out find clubs doing about three things right 1 use impound area unused transmitters 2 fly spots over 30 feet apart 3 Practically everyone still using AM radios Now FSK sets frequency-shift keyinglabeled FM becoming common Id like everyone add step above 4 They keep logbook way simple take transmitter pin sign out log sheet return transmitter pin impound area sign log sheet See Figs 1 & 2 After somebody having glitch trouble pattern will become visi ble logbook logbook gives real information worth thou sand expert opinions cant buy kind information have work IMPOUND LOG SHEET MONTGOMERY COUNTY RC FLIERS Page JqN rture Mote LIMETIMERCTIMEXTntt Ident Flight Station INITIALSREMARKS 902-&FY/BcQcaS CevrtU c/a CL cAIr6LV sq&WA4 920wfp/w/itLr4BA PCAt 10q2VM56 rjl4gqzr-PoN #Z 126-MMg92 # 13R4 y/r392-9 SlAT/ON #3 14932-AMCF 4 rFL s93IAICA A*6__ 4RC 77 iM 16 q46 kV8 0 C/RcU- ILNUMITD M 17 Q9-i4/1 ___________ 18AMF 4191 VG-i#l sfZ 2 MM 3i ___________________ 21 %99 pq y/13______________________ 2292-9/f4#3 23s0 __________________ 259z- q44/Z/__________________ 279SML24/i6arcW ci} &AM/4628W809oS -______________ TION FOR THE CLASS What probable cause glitch line 27 Answer end column might strike big pain neck part system club should consider using would invaluable aid checking RC inter ference problems Read Georges reasoning column Shown above example proposed Impound Log Sheet would look during days flying ses sion * answer question can found end column four examples shown right demonstrate general scheme use Log Sheet 32 Model Aviation Several people have written questioning advice turn receiver before transmitter idea course use receiver monitor chan nel intend use reply readers Eugene Babin 1106 Maplewood Dr Normal IL 61761 follows friends advise Turn trans mitter First because trying save charge flight battery pack prevent damage receiver servos turn receiver see no response walk off forget someone else may later turn something like electric fuel pump will drive servos beyond tolerable limits damage have alert possibility Remember turn receiver Off turn transmitter before damage done other hand system quiet should forget left transmitter may interfere someone else thats common form interference turn receiver Procedure 1 Load Impound before transmitter find out someone else using RC channel before take off perhaps find out air must know what look fact servos arent mov ing doesnt mean no using channel other fellow might have forgotten left transmitter turned also might flying Sailplane thing grab rudder try move someone channel servo will fight no servo will move easily difference knowing what look Bear mind poor arrangement servo leads can bring short ground range can make servos move around no else affecting should rearrange com ponents until such problems go away airborne system should absolute ly quiet transmitter turned off assuming RF-free environ ment isnt quiet find out fix Otherwise will flying along someday receiver will enter null area start doing its own TIMEINITIALSRCTIMEREMARKS INCHANNELOUT JI/ 6-4A AH3rilC& 5ILU7- AA Identify transmitter Procedure 2when log Sign out take pin & transmitter TIMEINITIALSRCTIMEREMARKS INCHANNELOUT 6HPAAM 31120STAT/OAf 3 Identify flight station Procedure 3if club uses Sign return pin & transmitter TIMEINITIALSRCTIMEREMARKS IN /Iqo ci 1-1 P-I Atl3ITCb OL LLOUT~ Interference reports Procedure 4 Sign out leaving field & taking transmitter thing will immediately complain about interferencebut nobody will able find because will carrying around inside fuselage model can TV4 interfere RC44 Some people want know some RC receiv ers have problem others dont answer simple enough interference caused image fre quency transmitter Any transmitter located 455 kHz away receiver s local oscillator image transmitter assuming conventional single-conver sion superhetrodyne receiver FCC gave us RC chan nels specified law transmitter frequency Choice local oscillator frequency receiver left up RC system designer Normally RC system designer chos es 72 MHz receiver crystal its frequency 455 kHz above its trans mitter puts image frequency 455 kHz above receiver 73-74 MHz band very few transmitters designer choses RC44 receiver crystal 72175 MHz 455 kHz below transmitter crystal image falls 71720 MHz puts image location band assigned TV4 real troublemaker TV4 sound FM found around 71700 thru 71800 MHz case RC44 RC46 interference prac tically guaranteed particularly RC system FM Fortunately other RC Continued page 34 September 1985 33 Digicon 17-01 Tele-Tachometer sya tern big unit ground-baaed re ceiver little rectangular unit near antenna airborne transmitter upper right earphone receiver want listen what airborne system saying other stuff collection sensorsfor plugging transmitter Youd need add battery pack transmitter 9 V battery receiver However problem George tells about column TIMEINITIALSRCTIMEREMARKS INCHANNELOUT t RIC Electronics PERSONAL SERVICE BY MILT ERB SPECIAL LOW PRICESService charge repair andior checkup system four servos $2975 maximum Extra servos$250 Parts return shipment extra FREQUENCY CONVERSIONS*3000 per system 50% off repair checkup SPECIALIZINGin competition systems frequency conversions FM equipment CUSTOM REPAIRSAll systems given personal attention test report comments careful cost control effort made return system likenew better operating condition HEATHKIT CUSTOMERSNew frequency conversions now available plug systemsS3500 per system AUTHORIZED FACTORY SERWCE FOR j~jjJ ne 1685 Beckwith Dr Hudson OH 44236216 655-2278 3 Astro Challe technology deli formance 1000 feet ealistically ecc 15 25 Co RFVOL L0 Flash Astro c Larry Jolly sets two-way average ENGLISH FLAIR KITS SEND FOR DETAILS DEALERS INiUIRE channels dont have problem fix simple Replace offending RC44 receiver crystal proper 73085 MHz single-conversion 455 kHz IF receiver RC44 retune receiver will put image frequency up Radio Astronomy band problem will go away Now going ask $64 ques tion does find out receiver local oscillator high side low side Usually have read number printed crystal case printed plastic pull tab see receiver crystal frequency 72465 MHz higher its usually high-side crystal other tests like having TV4 interference wont go now Thanks Frequency Committee mem ber Jack Albrecht explanation friend Norm Rosenstock went Toledo bought Digicon TT-0l Tele-Tachometers Condor Hobbies loaned Norms unit 40615 MHz No isnt frequencies see pro claimed Government Exclusive Fre quency Fixed Mobile litera ture says can get TT-0l 27 MHz RC channels wish also illegal telemetering Naturally isnt Type Acceptance sticker air borne transmitter either defense unit RF output listed 30 milli-Watts probably low enough no will care use dont blame some FBI-type decides pay visit Also listed data sheet note Coming soon Official USA tele metering frequency 490 MHz Maybe such thing havent heard about seems shame such useful device hasnt blessed FCC desig nation usable telemetering channels Another chore AMA Frequency Committee Airspeed reads out dual-scale meter 150 300 kilometers per hour can convert miles per hour multiplying reading 6214 Us ing close enough readout rpm 3000 15000 30000 rpm full scale Provision made switching tween sensors flight can read propeller rpm airspeed same flight alternately looks like nice tool Too bad illegal Give Impound Log try might learn something *Heres answer question posed sample Transmitter Impound Log sheet illustration Station No 1 AM46 arrived 952 Station No 2 FM arrived 951 Station No 3 FM42 Continued page 118 34 Model Aviation BARONETTE 9795 49 span 35-45 2 stroke 35-50 4 stroke LEBIONAIRE 5Iib 52 span 30-40 2 stroke 35-40 4 stroke Pre-Cut Balsa & Ply Parts Preformed Wire Hardware Tanks Spun Aluminum Cowls Also Available Magnatilla & Puppeteer VI MORLEY USA ARCHDALE DR LOTTE NC 28210 iJii eacn Ave na Del Rey ut w rNew UMSM Modelibau Belneke superb line German sailpianes leading edge technology throughout Beautiful fiberglass sa*ided obechi covered flying surfaces Super quality control housings almost fall together reasonably oriced 629 sq in/area 1600g 36 lbs ld fast slone/thermal shin Dingo 2600mm 100 span Eppler 374 airfoil 1700g 138 lbsl F3b slose racer 468 sq in/area 1300g 28 lbs beautiful scale ship cortlna4000mm l]5l spOn HitzsirToil ivon sq in/area 3300g 7 3 lbs stic 4-meter scalelike breathtaking beauty Schwalbenofshown2-meterspanEpplnr l6dairfoil 561 sq wlarea 1200g 26 lbs -pylon wing mount slope rocketship cliff Hawk piope i-an versions iwo designs iled sloper Shown conventional-tailed F3b-typn Slope 2300mm 90 span Eppler 178 airfoil 561 sq 1400g 31 lbs F3b-type 2700mm 106 HQ 25/8 airfoil 749 sq approx 60 oz er should blazer hill F3b version quotes numbers like current world champion F3b sailplanes Call Wilshire latest sailplanes electric flight equipment ship over worldl wilshire model center 2836 Santa Monica Blvd Santa Monica CA 90404 213 828-9362w Littlest Miracle Workshop PR1001 SUITABLE FOR ALL HOBBIES AND CRAFTS Makers of. Mini-Glue Tips Stray- Tray Tee Bar Mini-Saw juff-Stuff & Jewel Stripes Miles-Atwood/Reese Continued page 115 Dennis said Something really wrong holding full right rudder almost full right aileron just maintain level flight Somehow Dennis got airplane back down unhurtwhich considerable feat throttle stuck fly out full tank fuel ground discovered spars right wing cracked crash fully broken air could hear flutter covering miraculously held wing together After rep airing wing airplane still turned left knew wing twisted repair hard eyeball real difference taped sticks too inconclusive Frustrated bought Robart Incidence Meter measured twist little gadget magic accurate less wing washed-out 1 right wing washed-in 10 difference 3/16 per side based 9in chord used hair dryer twisted right wing until covering set too 1 washout match left side setup needed once again have nice-flying Sunday Scale airplane Radio Technique/Myers Continued page 34 arrived 944 left 955 prob able cause interference ThirdOrder Intermodulation aggravated fact late arrival Station No 1 AM set data tells what test setup will prove/disprove George M Myers 70 Froehlich Farm Rd Hicksville NY 11801 Cant Buy Skill traded old transmitter Thou ght new would give some breaks isnt kindlier makes same mistakes RC Soaring/Pruss Continued page 45 Bird/Australia Bame Reagan right behind 98 points landing score averages indicate great consistency can taken what worth remembering F3B landing tapes divided five-pointper-meter increments Again glance. Decker Blan chard two top 10 perfect 600/100 scores'Bird five out seven 100-point landings Bame four out seven like play around numbers no doubt will come up few what ifs note may want look back final results listed last month see what final placings would no throwaway round provision rules results surprising reflect biggest change results both individual placings team standings five F3B World Championships anyone has complaints about performance early portions World Championships complaints can probably attributed Wall week before its calm air no doubt lulled few folks expecting near-ideal conditions event Couple same type practice conditions back home few 25-mile-an-hour wall first day meet mental barrier some British claimed weather secret weaponand brought complaint thought would six-round championship therefore weather left home day too early Plustask three-view drawing month Dave Worralls Plustask plane flew within percentage point first place F3B World Championships year Interesting Lou Roberts features include one-piece wing full118 Model Aviation $235 repi strips$ 155 Add 20% postage Send 25C catalog_______ APPLIED DESIGN CORP 138 Penn Street El Segundo CA 90245 q 0 v in OOiiuai great flyer
Edition: Model Aviation - 1985/09
Page Numbers: 32, 33, 34, 118
George M Myers 4=== WHAT INTERFERENCE past two years have loaning out request AMA frequency monitor clubs District II know what have found Nothing havent found interference new RC channels Oh sure have found bridge tender pocket pager located old evennumbered channels 72080 72160 72240 72320 7240 7296 7564 MHz knew would happen happening before got new chan nels Thats got new channels law shouldnt inter ference new RC channels have exclusive use except interference get other modelers According small set tests have what expected know small comfort Bob Aberle observed RC real test ing-ground techniques will make cellular radio pocket pagers etc feasible stand side-by-side operate systems dont forced deal intermodulation problems can ignore intermodulation spoils thir communication have repeat last trans mission glitch crash So guess big bucks being spent Youve got it. pocket pagers cellular radios make understand RC model aviation is- best place develop new chips circuits perusing another two-inch stack newsletters receive AMA HQ time time struck frequent reprinting old June 1983 column interference column four-station flight card color apparently being cluded some Circus Hobbies radios contains well-known flaw use card should move 72080 BN/WH Red flight line Yellow flight line avoid possibility image interference Sorry about same time must point out Possible interference doesnt mean guaranteed Most clubs use com bination channels possible wonder guy Myers always talking about interference never have any~ check out find clubs doing about three things right 1 use impound area unused transmitters 2 fly spots over 30 feet apart 3 Practically everyone still using AM radios Now FSK sets frequency-shift keyinglabeled FM becoming common Id like everyone add step above 4 They keep logbook way simple take transmitter pin sign out log sheet return transmitter pin impound area sign log sheet See Figs 1 & 2 After somebody having glitch trouble pattern will become visi ble logbook logbook gives real information worth thou sand expert opinions cant buy kind information have work IMPOUND LOG SHEET MONTGOMERY COUNTY RC FLIERS Page JqN rture Mote LIMETIMERCTIMEXTntt Ident Flight Station INITIALSREMARKS 902-&FY/BcQcaS CevrtU c/a CL cAIr6LV sq&WA4 920wfp/w/itLr4BA PCAt 10q2VM56 rjl4gqzr-PoN #Z 126-MMg92 # 13R4 y/r392-9 SlAT/ON #3 14932-AMCF 4 rFL s93IAICA A*6__ 4RC 77 iM 16 q46 kV8 0 C/RcU- ILNUMITD M 17 Q9-i4/1 ___________ 18AMF 4191 VG-i#l sfZ 2 MM 3i ___________________ 21 %99 pq y/13______________________ 2292-9/f4#3 23s0 __________________ 259z- q44/Z/__________________ 279SML24/i6arcW ci} &AM/4628W809oS -______________ TION FOR THE CLASS What probable cause glitch line 27 Answer end column might strike big pain neck part system club should consider using would invaluable aid checking RC inter ference problems Read Georges reasoning column Shown above example proposed Impound Log Sheet would look during days flying ses sion * answer question can found end column four examples shown right demonstrate general scheme use Log Sheet 32 Model Aviation Several people have written questioning advice turn receiver before transmitter idea course use receiver monitor chan nel intend use reply readers Eugene Babin 1106 Maplewood Dr Normal IL 61761 follows friends advise Turn trans mitter First because trying save charge flight battery pack prevent damage receiver servos turn receiver see no response walk off forget someone else may later turn something like electric fuel pump will drive servos beyond tolerable limits damage have alert possibility Remember turn receiver Off turn transmitter before damage done other hand system quiet should forget left transmitter may interfere someone else thats common form interference turn receiver Procedure 1 Load Impound before transmitter find out someone else using RC channel before take off perhaps find out air must know what look fact servos arent mov ing doesnt mean no using channel other fellow might have forgotten left transmitter turned also might flying Sailplane thing grab rudder try move someone channel servo will fight no servo will move easily difference knowing what look Bear mind poor arrangement servo leads can bring short ground range can make servos move around no else affecting should rearrange com ponents until such problems go away airborne system should absolute ly quiet transmitter turned off assuming RF-free environ ment isnt quiet find out fix Otherwise will flying along someday receiver will enter null area start doing its own TIMEINITIALSRCTIMEREMARKS INCHANNELOUT JI/ 6-4A AH3rilC& 5ILU7- AA Identify transmitter Procedure 2when log Sign out take pin & transmitter TIMEINITIALSRCTIMEREMARKS INCHANNELOUT 6HPAAM 31120STAT/OAf 3 Identify flight station Procedure 3if club uses Sign return pin & transmitter TIMEINITIALSRCTIMEREMARKS IN /Iqo ci 1-1 P-I Atl3ITCb OL LLOUT~ Interference reports Procedure 4 Sign out leaving field & taking transmitter thing will immediately complain about interferencebut nobody will able find because will carrying around inside fuselage model can TV4 interfere RC44 Some people want know some RC receiv ers have problem others dont answer simple enough interference caused image fre quency transmitter Any transmitter located 455 kHz away receiver s local oscillator image transmitter assuming conventional single-conver sion superhetrodyne receiver FCC gave us RC chan nels specified law transmitter frequency Choice local oscillator frequency receiver left up RC system designer Normally RC system designer chos es 72 MHz receiver crystal its frequency 455 kHz above its trans mitter puts image frequency 455 kHz above receiver 73-74 MHz band very few transmitters designer choses RC44 receiver crystal 72175 MHz 455 kHz below transmitter crystal image falls 71720 MHz puts image location band assigned TV4 real troublemaker TV4 sound FM found around 71700 thru 71800 MHz case RC44 RC46 interference prac tically guaranteed particularly RC system FM Fortunately other RC Continued page 34 September 1985 33 Digicon 17-01 Tele-Tachometer sya tern big unit ground-baaed re ceiver little rectangular unit near antenna airborne transmitter upper right earphone receiver want listen what airborne system saying other stuff collection sensorsfor plugging transmitter Youd need add battery pack transmitter 9 V battery receiver However problem George tells about column TIMEINITIALSRCTIMEREMARKS INCHANNELOUT t RIC Electronics PERSONAL SERVICE BY MILT ERB SPECIAL LOW PRICESService charge repair andior checkup system four servos $2975 maximum Extra servos$250 Parts return shipment extra FREQUENCY CONVERSIONS*3000 per system 50% off repair checkup SPECIALIZINGin competition systems frequency conversions FM equipment CUSTOM REPAIRSAll systems given personal attention test report comments careful cost control effort made return system likenew better operating condition HEATHKIT CUSTOMERSNew frequency conversions now available plug systemsS3500 per system AUTHORIZED FACTORY SERWCE FOR j~jjJ ne 1685 Beckwith Dr Hudson OH 44236216 655-2278 3 Astro Challe technology deli formance 1000 feet ealistically ecc 15 25 Co RFVOL L0 Flash Astro c Larry Jolly sets two-way average ENGLISH FLAIR KITS SEND FOR DETAILS DEALERS INiUIRE channels dont have problem fix simple Replace offending RC44 receiver crystal proper 73085 MHz single-conversion 455 kHz IF receiver RC44 retune receiver will put image frequency up Radio Astronomy band problem will go away Now going ask $64 ques tion does find out receiver local oscillator high side low side Usually have read number printed crystal case printed plastic pull tab see receiver crystal frequency 72465 MHz higher its usually high-side crystal other tests like having TV4 interference wont go now Thanks Frequency Committee mem ber Jack Albrecht explanation friend Norm Rosenstock went Toledo bought Digicon TT-0l Tele-Tachometers Condor Hobbies loaned Norms unit 40615 MHz No isnt frequencies see pro claimed Government Exclusive Fre quency Fixed Mobile litera ture says can get TT-0l 27 MHz RC channels wish also illegal telemetering Naturally isnt Type Acceptance sticker air borne transmitter either defense unit RF output listed 30 milli-Watts probably low enough no will care use dont blame some FBI-type decides pay visit Also listed data sheet note Coming soon Official USA tele metering frequency 490 MHz Maybe such thing havent heard about seems shame such useful device hasnt blessed FCC desig nation usable telemetering channels Another chore AMA Frequency Committee Airspeed reads out dual-scale meter 150 300 kilometers per hour can convert miles per hour multiplying reading 6214 Us ing close enough readout rpm 3000 15000 30000 rpm full scale Provision made switching tween sensors flight can read propeller rpm airspeed same flight alternately looks like nice tool Too bad illegal Give Impound Log try might learn something *Heres answer question posed sample Transmitter Impound Log sheet illustration Station No 1 AM46 arrived 952 Station No 2 FM arrived 951 Station No 3 FM42 Continued page 118 34 Model Aviation BARONETTE 9795 49 span 35-45 2 stroke 35-50 4 stroke LEBIONAIRE 5Iib 52 span 30-40 2 stroke 35-40 4 stroke Pre-Cut Balsa & Ply Parts Preformed Wire Hardware Tanks Spun Aluminum Cowls Also Available Magnatilla & Puppeteer VI MORLEY USA ARCHDALE DR LOTTE NC 28210 iJii eacn Ave na Del Rey ut w rNew UMSM Modelibau Belneke superb line German sailpianes leading edge technology throughout Beautiful fiberglass sa*ided obechi covered flying surfaces Super quality control housings almost fall together reasonably oriced 629 sq in/area 1600g 36 lbs ld fast slone/thermal shin Dingo 2600mm 100 span Eppler 374 airfoil 1700g 138 lbsl F3b slose racer 468 sq in/area 1300g 28 lbs beautiful scale ship cortlna4000mm l]5l spOn HitzsirToil ivon sq in/area 3300g 7 3 lbs stic 4-meter scalelike breathtaking beauty Schwalbenofshown2-meterspanEpplnr l6dairfoil 561 sq wlarea 1200g 26 lbs -pylon wing mount slope rocketship cliff Hawk piope i-an versions iwo designs iled sloper Shown conventional-tailed F3b-typn Slope 2300mm 90 span Eppler 178 airfoil 561 sq 1400g 31 lbs F3b-type 2700mm 106 HQ 25/8 airfoil 749 sq approx 60 oz er should blazer hill F3b version quotes numbers like current world champion F3b sailplanes Call Wilshire latest sailplanes electric flight equipment ship over worldl wilshire model center 2836 Santa Monica Blvd Santa Monica CA 90404 213 828-9362w Littlest Miracle Workshop PR1001 SUITABLE FOR ALL HOBBIES AND CRAFTS Makers of. Mini-Glue Tips Stray- Tray Tee Bar Mini-Saw juff-Stuff & Jewel Stripes Miles-Atwood/Reese Continued page 115 Dennis said Something really wrong holding full right rudder almost full right aileron just maintain level flight Somehow Dennis got airplane back down unhurtwhich considerable feat throttle stuck fly out full tank fuel ground discovered spars right wing cracked crash fully broken air could hear flutter covering miraculously held wing together After rep airing wing airplane still turned left knew wing twisted repair hard eyeball real difference taped sticks too inconclusive Frustrated bought Robart Incidence Meter measured twist little gadget magic accurate less wing washed-out 1 right wing washed-in 10 difference 3/16 per side based 9in chord used hair dryer twisted right wing until covering set too 1 washout match left side setup needed once again have nice-flying Sunday Scale airplane Radio Technique/Myers Continued page 34 arrived 944 left 955 prob able cause interference ThirdOrder Intermodulation aggravated fact late arrival Station No 1 AM set data tells what test setup will prove/disprove George M Myers 70 Froehlich Farm Rd Hicksville NY 11801 Cant Buy Skill traded old transmitter Thou ght new would give some breaks isnt kindlier makes same mistakes RC Soaring/Pruss Continued page 45 Bird/Australia Bame Reagan right behind 98 points landing score averages indicate great consistency can taken what worth remembering F3B landing tapes divided five-pointper-meter increments Again glance. Decker Blan chard two top 10 perfect 600/100 scores'Bird five out seven 100-point landings Bame four out seven like play around numbers no doubt will come up few what ifs note may want look back final results listed last month see what final placings would no throwaway round provision rules results surprising reflect biggest change results both individual placings team standings five F3B World Championships anyone has complaints about performance early portions World Championships complaints can probably attributed Wall week before its calm air no doubt lulled few folks expecting near-ideal conditions event Couple same type practice conditions back home few 25-mile-an-hour wall first day meet mental barrier some British claimed weather secret weaponand brought complaint thought would six-round championship therefore weather left home day too early Plustask three-view drawing month Dave Worralls Plustask plane flew within percentage point first place F3B World Championships year Interesting Lou Roberts features include one-piece wing full118 Model Aviation $235 repi strips$ 155 Add 20% postage Send 25C catalog_______ APPLIED DESIGN CORP 138 Penn Street El Segundo CA 90245 q 0 v in OOiiuai great flyer
Edition: Model Aviation - 1985/09
Page Numbers: 32, 33, 34, 118
George M Myers 4=== WHAT INTERFERENCE past two years have loaning out request AMA frequency monitor clubs District II know what have found Nothing havent found interference new RC channels Oh sure have found bridge tender pocket pager located old evennumbered channels 72080 72160 72240 72320 7240 7296 7564 MHz knew would happen happening before got new chan nels Thats got new channels law shouldnt inter ference new RC channels have exclusive use except interference get other modelers According small set tests have what expected know small comfort Bob Aberle observed RC real test ing-ground techniques will make cellular radio pocket pagers etc feasible stand side-by-side operate systems dont forced deal intermodulation problems can ignore intermodulation spoils thir communication have repeat last trans mission glitch crash So guess big bucks being spent Youve got it. pocket pagers cellular radios make understand RC model aviation is- best place develop new chips circuits perusing another two-inch stack newsletters receive AMA HQ time time struck frequent reprinting old June 1983 column interference column four-station flight card color apparently being cluded some Circus Hobbies radios contains well-known flaw use card should move 72080 BN/WH Red flight line Yellow flight line avoid possibility image interference Sorry about same time must point out Possible interference doesnt mean guaranteed Most clubs use com bination channels possible wonder guy Myers always talking about interference never have any~ check out find clubs doing about three things right 1 use impound area unused transmitters 2 fly spots over 30 feet apart 3 Practically everyone still using AM radios Now FSK sets frequency-shift keyinglabeled FM becoming common Id like everyone add step above 4 They keep logbook way simple take transmitter pin sign out log sheet return transmitter pin impound area sign log sheet See Figs 1 & 2 After somebody having glitch trouble pattern will become visi ble logbook logbook gives real information worth thou sand expert opinions cant buy kind information have work IMPOUND LOG SHEET MONTGOMERY COUNTY RC FLIERS Page JqN rture Mote LIMETIMERCTIMEXTntt Ident Flight Station INITIALSREMARKS 902-&FY/BcQcaS CevrtU c/a CL cAIr6LV sq&WA4 920wfp/w/itLr4BA PCAt 10q2VM56 rjl4gqzr-PoN #Z 126-MMg92 # 13R4 y/r392-9 SlAT/ON #3 14932-AMCF 4 rFL s93IAICA A*6__ 4RC 77 iM 16 q46 kV8 0 C/RcU- ILNUMITD M 17 Q9-i4/1 ___________ 18AMF 4191 VG-i#l sfZ 2 MM 3i ___________________ 21 %99 pq y/13______________________ 2292-9/f4#3 23s0 __________________ 259z- q44/Z/__________________ 279SML24/i6arcW ci} &AM/4628W809oS -______________ TION FOR THE CLASS What probable cause glitch line 27 Answer end column might strike big pain neck part system club should consider using would invaluable aid checking RC inter ference problems Read Georges reasoning column Shown above example proposed Impound Log Sheet would look during days flying ses sion * answer question can found end column four examples shown right demonstrate general scheme use Log Sheet 32 Model Aviation Several people have written questioning advice turn receiver before transmitter idea course use receiver monitor chan nel intend use reply readers Eugene Babin 1106 Maplewood Dr Normal IL 61761 follows friends advise Turn trans mitter First because trying save charge flight battery pack prevent damage receiver servos turn receiver see no response walk off forget someone else may later turn something like electric fuel pump will drive servos beyond tolerable limits damage have alert possibility Remember turn receiver Off turn transmitter before damage done other hand system quiet should forget left transmitter may interfere someone else thats common form interference turn receiver Procedure 1 Load Impound before transmitter find out someone else using RC channel before take off perhaps find out air must know what look fact servos arent mov ing doesnt mean no using channel other fellow might have forgotten left transmitter turned also might flying Sailplane thing grab rudder try move someone channel servo will fight no servo will move easily difference knowing what look Bear mind poor arrangement servo leads can bring short ground range can make servos move around no else affecting should rearrange com ponents until such problems go away airborne system should absolute ly quiet transmitter turned off assuming RF-free environ ment isnt quiet find out fix Otherwise will flying along someday receiver will enter null area start doing its own TIMEINITIALSRCTIMEREMARKS INCHANNELOUT JI/ 6-4A AH3rilC& 5ILU7- AA Identify transmitter Procedure 2when log Sign out take pin & transmitter TIMEINITIALSRCTIMEREMARKS INCHANNELOUT 6HPAAM 31120STAT/OAf 3 Identify flight station Procedure 3if club uses Sign return pin & transmitter TIMEINITIALSRCTIMEREMARKS IN /Iqo ci 1-1 P-I Atl3ITCb OL LLOUT~ Interference reports Procedure 4 Sign out leaving field & taking transmitter thing will immediately complain about interferencebut nobody will able find because will carrying around inside fuselage model can TV4 interfere RC44 Some people want know some RC receiv ers have problem others dont answer simple enough interference caused image fre quency transmitter Any transmitter located 455 kHz away receiver s local oscillator image transmitter assuming conventional single-conver sion superhetrodyne receiver FCC gave us RC chan nels specified law transmitter frequency Choice local oscillator frequency receiver left up RC system designer Normally RC system designer chos es 72 MHz receiver crystal its frequency 455 kHz above its trans mitter puts image frequency 455 kHz above receiver 73-74 MHz band very few transmitters designer choses RC44 receiver crystal 72175 MHz 455 kHz below transmitter crystal image falls 71720 MHz puts image location band assigned TV4 real troublemaker TV4 sound FM found around 71700 thru 71800 MHz case RC44 RC46 interference prac tically guaranteed particularly RC system FM Fortunately other RC Continued page 34 September 1985 33 Digicon 17-01 Tele-Tachometer sya tern big unit ground-baaed re ceiver little rectangular unit near antenna airborne transmitter upper right earphone receiver want listen what airborne system saying other stuff collection sensorsfor plugging transmitter Youd need add battery pack transmitter 9 V battery receiver However problem George tells about column TIMEINITIALSRCTIMEREMARKS INCHANNELOUT t RIC Electronics PERSONAL SERVICE BY MILT ERB SPECIAL LOW PRICESService charge repair andior checkup system four servos $2975 maximum Extra servos$250 Parts return shipment extra FREQUENCY CONVERSIONS*3000 per system 50% off repair checkup SPECIALIZINGin competition systems frequency conversions FM equipment CUSTOM REPAIRSAll systems given personal attention test report comments careful cost control effort made return system likenew better operating condition HEATHKIT CUSTOMERSNew frequency conversions now available plug systemsS3500 per system AUTHORIZED FACTORY SERWCE FOR j~jjJ ne 1685 Beckwith Dr Hudson OH 44236216 655-2278 3 Astro Challe technology deli formance 1000 feet ealistically ecc 15 25 Co RFVOL L0 Flash Astro c Larry Jolly sets two-way average ENGLISH FLAIR KITS SEND FOR DETAILS DEALERS INiUIRE channels dont have problem fix simple Replace offending RC44 receiver crystal proper 73085 MHz single-conversion 455 kHz IF receiver RC44 retune receiver will put image frequency up Radio Astronomy band problem will go away Now going ask $64 ques tion does find out receiver local oscillator high side low side Usually have read number printed crystal case printed plastic pull tab see receiver crystal frequency 72465 MHz higher its usually high-side crystal other tests like having TV4 interference wont go now Thanks Frequency Committee mem ber Jack Albrecht explanation friend Norm Rosenstock went Toledo bought Digicon TT-0l Tele-Tachometers Condor Hobbies loaned Norms unit 40615 MHz No isnt frequencies see pro claimed Government Exclusive Fre quency Fixed Mobile litera ture says can get TT-0l 27 MHz RC channels wish also illegal telemetering Naturally isnt Type Acceptance sticker air borne transmitter either defense unit RF output listed 30 milli-Watts probably low enough no will care use dont blame some FBI-type decides pay visit Also listed data sheet note Coming soon Official USA tele metering frequency 490 MHz Maybe such thing havent heard about seems shame such useful device hasnt blessed FCC desig nation usable telemetering channels Another chore AMA Frequency Committee Airspeed reads out dual-scale meter 150 300 kilometers per hour can convert miles per hour multiplying reading 6214 Us ing close enough readout rpm 3000 15000 30000 rpm full scale Provision made switching tween sensors flight can read propeller rpm airspeed same flight alternately looks like nice tool Too bad illegal Give Impound Log try might learn something *Heres answer question posed sample Transmitter Impound Log sheet illustration Station No 1 AM46 arrived 952 Station No 2 FM arrived 951 Station No 3 FM42 Continued page 118 34 Model Aviation BARONETTE 9795 49 span 35-45 2 stroke 35-50 4 stroke LEBIONAIRE 5Iib 52 span 30-40 2 stroke 35-40 4 stroke Pre-Cut Balsa & Ply Parts Preformed Wire Hardware Tanks Spun Aluminum Cowls Also Available Magnatilla & Puppeteer VI MORLEY USA ARCHDALE DR LOTTE NC 28210 iJii eacn Ave na Del Rey ut w rNew UMSM Modelibau Belneke superb line German sailpianes leading edge technology throughout Beautiful fiberglass sa*ided obechi covered flying surfaces Super quality control housings almost fall together reasonably oriced 629 sq in/area 1600g 36 lbs ld fast slone/thermal shin Dingo 2600mm 100 span Eppler 374 airfoil 1700g 138 lbsl F3b slose racer 468 sq in/area 1300g 28 lbs beautiful scale ship cortlna4000mm l]5l spOn HitzsirToil ivon sq in/area 3300g 7 3 lbs stic 4-meter scalelike breathtaking beauty Schwalbenofshown2-meterspanEpplnr l6dairfoil 561 sq wlarea 1200g 26 lbs -pylon wing mount slope rocketship cliff Hawk piope i-an versions iwo designs iled sloper Shown conventional-tailed F3b-typn Slope 2300mm 90 span Eppler 178 airfoil 561 sq 1400g 31 lbs F3b-type 2700mm 106 HQ 25/8 airfoil 749 sq approx 60 oz er should blazer hill F3b version quotes numbers like current world champion F3b sailplanes Call Wilshire latest sailplanes electric flight equipment ship over worldl wilshire model center 2836 Santa Monica Blvd Santa Monica CA 90404 213 828-9362w Littlest Miracle Workshop PR1001 SUITABLE FOR ALL HOBBIES AND CRAFTS Makers of. Mini-Glue Tips Stray- Tray Tee Bar Mini-Saw juff-Stuff & Jewel Stripes Miles-Atwood/Reese Continued page 115 Dennis said Something really wrong holding full right rudder almost full right aileron just maintain level flight Somehow Dennis got airplane back down unhurtwhich considerable feat throttle stuck fly out full tank fuel ground discovered spars right wing cracked crash fully broken air could hear flutter covering miraculously held wing together After rep airing wing airplane still turned left knew wing twisted repair hard eyeball real difference taped sticks too inconclusive Frustrated bought Robart Incidence Meter measured twist little gadget magic accurate less wing washed-out 1 right wing washed-in 10 difference 3/16 per side based 9in chord used hair dryer twisted right wing until covering set too 1 washout match left side setup needed once again have nice-flying Sunday Scale airplane Radio Technique/Myers Continued page 34 arrived 944 left 955 prob able cause interference ThirdOrder Intermodulation aggravated fact late arrival Station No 1 AM set data tells what test setup will prove/disprove George M Myers 70 Froehlich Farm Rd Hicksville NY 11801 Cant Buy Skill traded old transmitter Thou ght new would give some breaks isnt kindlier makes same mistakes RC Soaring/Pruss Continued page 45 Bird/Australia Bame Reagan right behind 98 points landing score averages indicate great consistency can taken what worth remembering F3B landing tapes divided five-pointper-meter increments Again glance. Decker Blan chard two top 10 perfect 600/100 scores'Bird five out seven 100-point landings Bame four out seven like play around numbers no doubt will come up few what ifs note may want look back final results listed last month see what final placings would no throwaway round provision rules results surprising reflect biggest change results both individual placings team standings five F3B World Championships anyone has complaints about performance early portions World Championships complaints can probably attributed Wall week before its calm air no doubt lulled few folks expecting near-ideal conditions event Couple same type practice conditions back home few 25-mile-an-hour wall first day meet mental barrier some British claimed weather secret weaponand brought complaint thought would six-round championship therefore weather left home day too early Plustask three-view drawing month Dave Worralls Plustask plane flew within percentage point first place F3B World Championships year Interesting Lou Roberts features include one-piece wing full118 Model Aviation $235 repi strips$ 155 Add 20% postage Send 25C catalog_______ APPLIED DESIGN CORP 138 Penn Street El Segundo CA 90245 q 0 v in OOiiuai great flyer
Edition: Model Aviation - 1985/09
Page Numbers: 32, 33, 34, 118
George M Myers 4=== WHAT INTERFERENCE past two years have loaning out request AMA frequency monitor clubs District II know what have found Nothing havent found interference new RC channels Oh sure have found bridge tender pocket pager located old evennumbered channels 72080 72160 72240 72320 7240 7296 7564 MHz knew would happen happening before got new chan nels Thats got new channels law shouldnt inter ference new RC channels have exclusive use except interference get other modelers According small set tests have what expected know small comfort Bob Aberle observed RC real test ing-ground techniques will make cellular radio pocket pagers etc feasible stand side-by-side operate systems dont forced deal intermodulation problems can ignore intermodulation spoils thir communication have repeat last trans mission glitch crash So guess big bucks being spent Youve got it. pocket pagers cellular radios make understand RC model aviation is- best place develop new chips circuits perusing another two-inch stack newsletters receive AMA HQ time time struck frequent reprinting old June 1983 column interference column four-station flight card color apparently being cluded some Circus Hobbies radios contains well-known flaw use card should move 72080 BN/WH Red flight line Yellow flight line avoid possibility image interference Sorry about same time must point out Possible interference doesnt mean guaranteed Most clubs use com bination channels possible wonder guy Myers always talking about interference never have any~ check out find clubs doing about three things right 1 use impound area unused transmitters 2 fly spots over 30 feet apart 3 Practically everyone still using AM radios Now FSK sets frequency-shift keyinglabeled FM becoming common Id like everyone add step above 4 They keep logbook way simple take transmitter pin sign out log sheet return transmitter pin impound area sign log sheet See Figs 1 & 2 After somebody having glitch trouble pattern will become visi ble logbook logbook gives real information worth thou sand expert opinions cant buy kind information have work IMPOUND LOG SHEET MONTGOMERY COUNTY RC FLIERS Page JqN rture Mote LIMETIMERCTIMEXTntt Ident Flight Station INITIALSREMARKS 902-&FY/BcQcaS CevrtU c/a CL cAIr6LV sq&WA4 920wfp/w/itLr4BA PCAt 10q2VM56 rjl4gqzr-PoN #Z 126-MMg92 # 13R4 y/r392-9 SlAT/ON #3 14932-AMCF 4 rFL s93IAICA A*6__ 4RC 77 iM 16 q46 kV8 0 C/RcU- ILNUMITD M 17 Q9-i4/1 ___________ 18AMF 4191 VG-i#l sfZ 2 MM 3i ___________________ 21 %99 pq y/13______________________ 2292-9/f4#3 23s0 __________________ 259z- q44/Z/__________________ 279SML24/i6arcW ci} &AM/4628W809oS -______________ TION FOR THE CLASS What probable cause glitch line 27 Answer end column might strike big pain neck part system club should consider using would invaluable aid checking RC inter ference problems Read Georges reasoning column Shown above example proposed Impound Log Sheet would look during days flying ses sion * answer question can found end column four examples shown right demonstrate general scheme use Log Sheet 32 Model Aviation Several people have written questioning advice turn receiver before transmitter idea course use receiver monitor chan nel intend use reply readers Eugene Babin 1106 Maplewood Dr Normal IL 61761 follows friends advise Turn trans mitter First because trying save charge flight battery pack prevent damage receiver servos turn receiver see no response walk off forget someone else may later turn something like electric fuel pump will drive servos beyond tolerable limits damage have alert possibility Remember turn receiver Off turn transmitter before damage done other hand system quiet should forget left transmitter may interfere someone else thats common form interference turn receiver Procedure 1 Load Impound before transmitter find out someone else using RC channel before take off perhaps find out air must know what look fact servos arent mov ing doesnt mean no using channel other fellow might have forgotten left transmitter turned also might flying Sailplane thing grab rudder try move someone channel servo will fight no servo will move easily difference knowing what look Bear mind poor arrangement servo leads can bring short ground range can make servos move around no else affecting should rearrange com ponents until such problems go away airborne system should absolute ly quiet transmitter turned off assuming RF-free environ ment isnt quiet find out fix Otherwise will flying along someday receiver will enter null area start doing its own TIMEINITIALSRCTIMEREMARKS INCHANNELOUT JI/ 6-4A AH3rilC& 5ILU7- AA Identify transmitter Procedure 2when log Sign out take pin & transmitter TIMEINITIALSRCTIMEREMARKS INCHANNELOUT 6HPAAM 31120STAT/OAf 3 Identify flight station Procedure 3if club uses Sign return pin & transmitter TIMEINITIALSRCTIMEREMARKS IN /Iqo ci 1-1 P-I Atl3ITCb OL LLOUT~ Interference reports Procedure 4 Sign out leaving field & taking transmitter thing will immediately complain about interferencebut nobody will able find because will carrying around inside fuselage model can TV4 interfere RC44 Some people want know some RC receiv ers have problem others dont answer simple enough interference caused image fre quency transmitter Any transmitter located 455 kHz away receiver s local oscillator image transmitter assuming conventional single-conver sion superhetrodyne receiver FCC gave us RC chan nels specified law transmitter frequency Choice local oscillator frequency receiver left up RC system designer Normally RC system designer chos es 72 MHz receiver crystal its frequency 455 kHz above its trans mitter puts image frequency 455 kHz above receiver 73-74 MHz band very few transmitters designer choses RC44 receiver crystal 72175 MHz 455 kHz below transmitter crystal image falls 71720 MHz puts image location band assigned TV4 real troublemaker TV4 sound FM found around 71700 thru 71800 MHz case RC44 RC46 interference prac tically guaranteed particularly RC system FM Fortunately other RC Continued page 34 September 1985 33 Digicon 17-01 Tele-Tachometer sya tern big unit ground-baaed re ceiver little rectangular unit near antenna airborne transmitter upper right earphone receiver want listen what airborne system saying other stuff collection sensorsfor plugging transmitter Youd need add battery pack transmitter 9 V battery receiver However problem George tells about column TIMEINITIALSRCTIMEREMARKS INCHANNELOUT t RIC Electronics PERSONAL SERVICE BY MILT ERB SPECIAL LOW PRICESService charge repair andior checkup system four servos $2975 maximum Extra servos$250 Parts return shipment extra FREQUENCY CONVERSIONS*3000 per system 50% off repair checkup SPECIALIZINGin competition systems frequency conversions FM equipment CUSTOM REPAIRSAll systems given personal attention test report comments careful cost control effort made return system likenew better operating condition HEATHKIT CUSTOMERSNew frequency conversions now available plug systemsS3500 per system AUTHORIZED FACTORY SERWCE FOR j~jjJ ne 1685 Beckwith Dr Hudson OH 44236216 655-2278 3 Astro Challe technology deli formance 1000 feet ealistically ecc 15 25 Co RFVOL L0 Flash Astro c Larry Jolly sets two-way average ENGLISH FLAIR KITS SEND FOR DETAILS DEALERS INiUIRE channels dont have problem fix simple Replace offending RC44 receiver crystal proper 73085 MHz single-conversion 455 kHz IF receiver RC44 retune receiver will put image frequency up Radio Astronomy band problem will go away Now going ask $64 ques tion does find out receiver local oscillator high side low side Usually have read number printed crystal case printed plastic pull tab see receiver crystal frequency 72465 MHz higher its usually high-side crystal other tests like having TV4 interference wont go now Thanks Frequency Committee mem ber Jack Albrecht explanation friend Norm Rosenstock went Toledo bought Digicon TT-0l Tele-Tachometers Condor Hobbies loaned Norms unit 40615 MHz No isnt frequencies see pro claimed Government Exclusive Fre quency Fixed Mobile litera ture says can get TT-0l 27 MHz RC channels wish also illegal telemetering Naturally isnt Type Acceptance sticker air borne transmitter either defense unit RF output listed 30 milli-Watts probably low enough no will care use dont blame some FBI-type decides pay visit Also listed data sheet note Coming soon Official USA tele metering frequency 490 MHz Maybe such thing havent heard about seems shame such useful device hasnt blessed FCC desig nation usable telemetering channels Another chore AMA Frequency Committee Airspeed reads out dual-scale meter 150 300 kilometers per hour can convert miles per hour multiplying reading 6214 Us ing close enough readout rpm 3000 15000 30000 rpm full scale Provision made switching tween sensors flight can read propeller rpm airspeed same flight alternately looks like nice tool Too bad illegal Give Impound Log try might learn something *Heres answer question posed sample Transmitter Impound Log sheet illustration Station No 1 AM46 arrived 952 Station No 2 FM arrived 951 Station No 3 FM42 Continued page 118 34 Model Aviation BARONETTE 9795 49 span 35-45 2 stroke 35-50 4 stroke LEBIONAIRE 5Iib 52 span 30-40 2 stroke 35-40 4 stroke Pre-Cut Balsa & Ply Parts Preformed Wire Hardware Tanks Spun Aluminum Cowls Also Available Magnatilla & Puppeteer VI MORLEY USA ARCHDALE DR LOTTE NC 28210 iJii eacn Ave na Del Rey ut w rNew UMSM Modelibau Belneke superb line German sailpianes leading edge technology throughout Beautiful fiberglass sa*ided obechi covered flying surfaces Super quality control housings almost fall together reasonably oriced 629 sq in/area 1600g 36 lbs ld fast slone/thermal shin Dingo 2600mm 100 span Eppler 374 airfoil 1700g 138 lbsl F3b slose racer 468 sq in/area 1300g 28 lbs beautiful scale ship cortlna4000mm l]5l spOn HitzsirToil ivon sq in/area 3300g 7 3 lbs stic 4-meter scalelike breathtaking beauty Schwalbenofshown2-meterspanEpplnr l6dairfoil 561 sq wlarea 1200g 26 lbs -pylon wing mount slope rocketship cliff Hawk piope i-an versions iwo designs iled sloper Shown conventional-tailed F3b-typn Slope 2300mm 90 span Eppler 178 airfoil 561 sq 1400g 31 lbs F3b-type 2700mm 106 HQ 25/8 airfoil 749 sq approx 60 oz er should blazer hill F3b version quotes numbers like current world champion F3b sailplanes Call Wilshire latest sailplanes electric flight equipment ship over worldl wilshire model center 2836 Santa Monica Blvd Santa Monica CA 90404 213 828-9362w Littlest Miracle Workshop PR1001 SUITABLE FOR ALL HOBBIES AND CRAFTS Makers of. Mini-Glue Tips Stray- Tray Tee Bar Mini-Saw juff-Stuff & Jewel Stripes Miles-Atwood/Reese Continued page 115 Dennis said Something really wrong holding full right rudder almost full right aileron just maintain level flight Somehow Dennis got airplane back down unhurtwhich considerable feat throttle stuck fly out full tank fuel ground discovered spars right wing cracked crash fully broken air could hear flutter covering miraculously held wing together After rep airing wing airplane still turned left knew wing twisted repair hard eyeball real difference taped sticks too inconclusive Frustrated bought Robart Incidence Meter measured twist little gadget magic accurate less wing washed-out 1 right wing washed-in 10 difference 3/16 per side based 9in chord used hair dryer twisted right wing until covering set too 1 washout match left side setup needed once again have nice-flying Sunday Scale airplane Radio Technique/Myers Continued page 34 arrived 944 left 955 prob able cause interference ThirdOrder Intermodulation aggravated fact late arrival Station No 1 AM set data tells what test setup will prove/disprove George M Myers 70 Froehlich Farm Rd Hicksville NY 11801 Cant Buy Skill traded old transmitter Thou ght new would give some breaks isnt kindlier makes same mistakes RC Soaring/Pruss Continued page 45 Bird/Australia Bame Reagan right behind 98 points landing score averages indicate great consistency can taken what worth remembering F3B landing tapes divided five-pointper-meter increments Again glance. Decker Blan chard two top 10 perfect 600/100 scores'Bird five out seven 100-point landings Bame four out seven like play around numbers no doubt will come up few what ifs note may want look back final results listed last month see what final placings would no throwaway round provision rules results surprising reflect biggest change results both individual placings team standings five F3B World Championships anyone has complaints about performance early portions World Championships complaints can probably attributed Wall week before its calm air no doubt lulled few folks expecting near-ideal conditions event Couple same type practice conditions back home few 25-mile-an-hour wall first day meet mental barrier some British claimed weather secret weaponand brought complaint thought would six-round championship therefore weather left home day too early Plustask three-view drawing month Dave Worralls Plustask plane flew within percentage point first place F3B World Championships year Interesting Lou Roberts features include one-piece wing full118 Model Aviation $235 repi strips$ 155 Add 20% postage Send 25C catalog_______ APPLIED DESIGN CORP 138 Penn Street El Segundo CA 90245 q 0 v in OOiiuai great flyer