SEVERAL years back FAI rules group delet ed scoring takeoff landing Since quality takeoffs landings FAI pilots has uniformly poor seldom missed chance harass FAI pilots suggesting should attend remedial takeoff landing school considerable glee greet ed announcement FAI pilots would again judged takeoff landing 1988 about get comeuppances got hold notice Ron Chidgey chairman FAIs ClAM F3A Sub committee sent US clubs subject F3A rules clarifications ef fective January 1 1988 first change involved changing position Figure M /2 rolls Square Loop /2 rolls flight sequence im prove presentation Half Reverse Cuban Eight second change Delete entire description including downgrades notes Maneuver No 1 Takeoff Sequence Maneu ver No 23 Landing Sequence descriptions replaced following 1 Takeoff Sequence model placed runway takes off turns 900 toward upwind marker approximately over marker model turns 2700 downwind trim pass approximately down wind marker model initiates 1800 turn reversal pilots choice Downgrades 1 Model does follow takeoff sequence zero points Note two scores zero 10 may awarded takeoff sequence 23 Landing Sequence reduced power model executes 1800 level descending turn downwind heading flies downwind leg turns 1800 wind Model flies descend ing approach runway touch ground landing zone landing sequence com plete model has rolled 10 meters Downgrades 1 Model does follow land ing sequence zero points 2 undercarriage leg retracts landing zero points 3 model lands outside landing zone zero points landing zone may designated circle 50 meters radius lines across standard runway spaced 100 meters apart runway least 10 meters wide Note two scores zero 10 may awarded landing sequence Ron Chidgey noted reason last rules clarification was intended takeoff landing per se critically 42 Model Aviation Rado Control Sport Aerobatics Ron Van Putte III Sleepy Oaks Rd Ft Walton Beach FL 32548 Van Putte 87 Nats Atlanta flewborrowed Paul Verger Lafayette LA Robert Aptel Niceville FL built nice Coverite Black Baron Specialbut tried cross us up decorating like Sort-A-Scale Peashooter also made Coverite Bill Cunningham Broken Arrow OK few FAI pilots author Van Puttes opinion can still takeoff land airplane well Ron has quite bit say about FAI scoring sequences months column judged new wording will continue make two-gear undercarriages grass contest sites viable alternatives initial response publishable family-oriented magazine big boys go ing continue poor takeoffs landings because have demon strate something resembling two sequences earn two lOs Consequently cant think rea son either sequence book likely reason pilot would get zero takeoff would engine flamed out case flight would over anyway Simi larly likely reason pilot would get zero landing would engine flamed out couldnt make landing zone gear leg failed Big deal thought points supposed awarded pilot proficien cy taken away bad luck Mysterious ways international rules gurus mail came announcement Mike Lauman did scoring F3A team selection finals Masters Tournament 1987 Nationals RC Pattern events offer ing distribute RC Pattern scoring software interested people package price $25 cludes program diskette users manual complete operating instructions supports 1988-89 AMA F3A Pattern events According Mike partial list program features includes 1 Up 500 contestants fly ing up eight rounds up mne classes up 24 judges per line 2 Runs IBMcompatible PC under PC-DOS MS-DOS requires minimum 256K RAM 3 Will run small contest 360K floppy drive large two 360K drives hard disk rec ommended optimum performance 4 Com pletely menu-driven self-explanatory user-friendly screens need computer person operate system 5 Streamlined data entry full-screen editing capability raw score entered two keystrokes including half-point scores An optional audit trail can printed flier 6 Handles freeform events such Masters class easily allows changing maneuver schedule time during contest 7 data stored disk entered power outages have minimal effect 8 Prints score sheets registration forms mailing labels contestant listings sorted name class frequency AMA number flight order 9 Prints current standings time showing round score combined total average order ranked highest lowest final score Mike goes describe possible scoring options including dropping high and/or low judge scores either maneuver flight dropping high and/or low round scores normalizing will maintain list purchasers program will keep informed new releases bugs found killed other pro gram activity youre interested send $25 check mon ey order Mike Lauman 150 Plum Tree Rd Brandon MS 39042 night phone number 601 992-1900 invites anyone call write information got another letter Tom Young Lakeville MN Tom signed letter Search Answers thought some excerpts letter questions swers would general interest Tom back RC after kids slowed flying time almost nothing currently has Continued page 133 Adjustable side frames free-flow ventilation Extremely light weight added comfort _____ Attractive case included frame fits comfortably over prescription glasses Blocks harmful ultraviolet radiation. Quartz mist coated scratch resistance Made entirely Polycarbonate impact protection ANSI Z871 specifications Available in Clear shop work $1325 Amber overcast days & late afternoons S14~ Gray $14~ & Mirror $19~ sunny days CA Mask $15~ Paint Mask S2O~ member club hit prop blade thrown 60 engine close range tip blade struck Safety Plus glasses saved him serious injury possibly loss eye incident convinced everyone should wear safety glasses near model airplane engines being run upEd Saul Secretary Treasurer Pikes Peak RC Club •A~ U hobby dealer first doesnt have what need order direct SAFETY PLUS PO Box 1173 Dept iM Clinton MS 39056 Ph 601 924-9640 Shipping & handling included Visa MasterCard accepted High Performance Models presents ECL IPSE Designed Henry Piorun Former Canadian National Champion & FAI Canadian Team Member Designed Specifically FAI Pattern Flying Perform Equally Well Other AMA Classes Plug Wings rglass Belly Pan Pie-Cut Hoies Wing Joiner Tubes Ultraiight Honeycomb Win gcores extra $35 Optional Plastic Fiberglass Canopy Fiberglass Fuselage molded wing Joiner tube HIGH PERFORMANCE MODELS 9566116 st. North Delta British Columbia 6Z4 Canada 604-588-0605 MB SMIflflHI Z1FDUDflZRD 7550 Sen Gob,oI Road cadeco CA 53422 456-1717 April 1988 43 PILOT GLASSES. HOW VALUABLE IS YOUR EYESIGHT Basic Kit $12500 Pre-Built Kit $32500 ladd $1500 S & H Send Check Money Order *975 AVAILABLE AT AMERICAS FINEST HOBBY SHOPS *975*525 DISTRIBUTED BY Centivoitmeter meter indicates centivolts what else would call meter shows 478 cV battery pack has terminal voltage 478 volts Id happier front panel marked cV instead Volts Either automatic decimal point should have provided Since Accu-Tach 2 indicates numbers small 10 mV can use Peak De tection Charging nickle-cadmium batteries set up charging rate will get job done 15 minutes watch battery terminal voltage see volt age rise above expected value drop two centivolts below what few seconds before charging complete must caution overcharging high rate can ruin battery must pay tention what doing should battery pack cool touch pack will get quite warm during charging should never get hot gets hot stays hot know youve just junked battery pack mix/match crowd can mea sure control pulses coming out receiver determine positive- negative-going can determine whether use some substitute servos Connect Common lead battery Negative Connect Positive Volts lead signal lead coming out receiver Push pin through servo pigtail necessary Now voltage shows about 25 cV looking positive-going pulses reads about 380 CV have negative-going pulses very rare Expanded-Scale Voltmeter Im sure people will use built-in resistors battery tests because thats con venient way using some unusu al battery size some alternatives available flight pack has less capacity usual such SR300 packs recommended Top Flite Wristocat put scale switch TX position current drawn pack will about 120 mA External shunts can fitted produce higher discharge currents would want customary discharge-test nickle-cadmium batteries rate equal one-half batterys rating example want test 1200 mAh flight pack discharging rate 600 mA should last two hours before terminal voltage drops 44 VDC other sizes packs consult following table find resistor can connected GR plug shunt RXTX COM ShuntResistor1011/lOw2012/lOw5011/lOw10012/lOw Radio Shack #271-1322 series271-1332 series Type cells RX1200 utAh900 mAh650 mAhna TX2400 mAh1200 mAk900 mAh650 utAh Note Shant resistors will get hot Gee Bee/Haffke Continued page 41 el reacts controls positively gently docile air will about thing care try will flying Gee Bee Scale competition will glad share documentation material Write list available photos Model Y variants Henry Hafjke 1038 W Elmer Road Vineland NJ 08360 RC Aerobatics/Van Putte Continued page 43 MK Curare 40 Rhom retracts pow ered piped 05 46 VF rear-exhaust engine Hes building MK Arrow 40 46 VF up front winter wants know advantage running 9 x 6 three-bladed prop 46 VF compared Master Airscrew 10 x 7 Ive running rpm going burn motor Out require lower-nitro fuel use 15%-nitro fuel honest real advantage Ive found using three-blade props lower prop diameter buys extra ground clearance really high-revving engines like 46 VF prop blade can actually operating wake blade ahead thereby reducing its efficiency right three-blade prop will often give same performance proper twoblade prop dont expect major surge power may Clarence Lee dont foresee engine burnout problem need try lower-nitro fuel However 15% fuel must cost bundle Ive using 5% years havent really noticed much loss power Torn goes does determine proper length tuned pipe April 1988 133 RAPIER 40-60 MADE IN THE USA PICAS CHALLENGE RAPIER CUTS THROUGH THE COMPETITION WITH 752 sq 1Advanced building technology57 2Straight forward all-balsa construction48 3Clear detailed instructions 45-6 lbs Full size plans40-60 2c 5Superb flight characteristics60-90 4c [v33][b-1-10-1-10]]Aa0 Wing Area Wing Span Fuse Length Functions Weight Engine Size SAFE FLYING IS NO ACCIDENT SEE YOUR DEALER FIRST U can help you can order direct us sending full price plus $200 handling U fee 116W 19th St POBox 6 Higginsville MO 64037 call 816 584-7121U U U U U U U U U EU... EEEEEEUEE -7mount pressure tap goes answers own questions what would have told him trial error using tach largest expansion area pipe Actually theres pretty good chart MACS published pipes can use get very close right dimensionseven someone elses pipes advice tuning pipe Dont get greedy far better have pipe slightly too long too short Another lesson learned hard way mentions having rebend landing gear after flight because operates off rough field gears bend quite easily common problem Im surprised solu tion hasnt spread through hobby word-of-mouth Maybe metallurgist can ex plain appears after landing gear strut coils wound wire will bend fairly easily either direction solution problem works well ss put gear struts very hot 500 O 5500 F oven half hour quench cold water cant explain metallurgist should write please gear strut becomes much rigid Moving right along Toms questions mechanical retracts work well pneu matic retracts mechanical systems use two retract servos tn-gear setup prefer mechanical retracts because dont want fuss pressure tank control valve pressure tubing dont mind bother stalling pushrods Theres no question pneu matic retracts easier install problems maintenance over life airplane mechanical retracts years used retract servo wing operating three mechanical retracts worked fairly well time last airplane put retract servo wing main gears fuselage nose gear will never again use retract servo Two retract servos much easier stall reliable operate can afford extra two ounces airplane weight costs Tom asked another question bound interesting people landing gears bend easily Does battery drain become problem wheel working Obviously wants know battery can drain down wheel gets hung up wheel well wont go way up back down answer Yes Gears bind up will cause servo operate its stall current can easily severai hundred milliamperes current Since typically fly 500- 800milliampere-hour mAh battery packs doesnt take long drain down strongest battery perfectly pwpurrunu ur modeling Curtlss Robin 049 Engines -Channel RIC 41 Wingspan Electric Power Optional $2206 Oh 003 Very few lull Scale aicaff ideally suited model flight appealing old curtiss Robin horn spruce lines age beautifully proportioned rubber elect nC glow engines Easy end fun build trainerlibe performance Flyline Models catalog 500phone 17031 2730003 FLYLINE MODELS INC V PO Box 2136 FaIrfax Virginia 22e31 USA pack Tom mentioned reason used Rhom pneumatic retracts avoid airborne battery problems Its valid point Toms last question dilly What servos top gun fliers use aileron elevator might think would consen sus manufacturer isnt know Futaba PCM fliers use JR 401 501 ser vos Similarly JR fliers like Fu taba 130 131 servos real consensus should get top-of-the-line servo aileron elevator Franidy lot nuances servo performance top guns can de tect lost rest us RC Scale/Wischers Continued page 45 cleaning spark plugs looking uni form texture scalelike impression Light airplanes sometimes use steel stampings scissors members model can formed aluminum steel hard alloys aluminum dont form well likely crack along sharp bend Aluminum fresh mill can formed reasonably sharp radius year later will orange peel crack along bend Thin steel may better choice wheel axles made 156-indiameter music wire bent inserted lower telescoping part shock strut Lowtemperature solder used secure wire strut Strength solder ample because large area wetted molten solder last assembly step after high-heat brazed joints have made avoid changing tem per music wire would greatly weak en retractable gears retract mechanism always provides suitable structure mounting models wing fuselage Fixed landing gears inserted holes drilled hardwood blocks birch maple preferred spread load over large area possible through spr rounding balsa plywood Steel rods 156-in music wire can passed through hardwood blocks extended rearwardfor example additional hardwood cemented rear spar wing trying spread landing loads large area type construction has used stand hundreds landings Scale models landings perfectly executed shock absorbing struts dissipate impact load model may bounce back air will survive bounce again amount bounce determined springs side struts can hand-wound pur 134 Model Aviation A-J INTERCEPTOR RTF $695 $495 NOn rL$00* *00 $0 00 roe pO$flC$ OooofluuOrIftShoofte$oOOEhS AmUIJU AIRCRAFT COMPANY PO Box 68132 Portland OR 97268 I-U U U U U U U U U U U U U U U U U U U U
Edition: Model Aviation - 1988/04
Page Numbers: 42, 43, 133, 134
SEVERAL years back FAI rules group delet ed scoring takeoff landing Since quality takeoffs landings FAI pilots has uniformly poor seldom missed chance harass FAI pilots suggesting should attend remedial takeoff landing school considerable glee greet ed announcement FAI pilots would again judged takeoff landing 1988 about get comeuppances got hold notice Ron Chidgey chairman FAIs ClAM F3A Sub committee sent US clubs subject F3A rules clarifications ef fective January 1 1988 first change involved changing position Figure M /2 rolls Square Loop /2 rolls flight sequence im prove presentation Half Reverse Cuban Eight second change Delete entire description including downgrades notes Maneuver No 1 Takeoff Sequence Maneu ver No 23 Landing Sequence descriptions replaced following 1 Takeoff Sequence model placed runway takes off turns 900 toward upwind marker approximately over marker model turns 2700 downwind trim pass approximately down wind marker model initiates 1800 turn reversal pilots choice Downgrades 1 Model does follow takeoff sequence zero points Note two scores zero 10 may awarded takeoff sequence 23 Landing Sequence reduced power model executes 1800 level descending turn downwind heading flies downwind leg turns 1800 wind Model flies descend ing approach runway touch ground landing zone landing sequence com plete model has rolled 10 meters Downgrades 1 Model does follow land ing sequence zero points 2 undercarriage leg retracts landing zero points 3 model lands outside landing zone zero points landing zone may designated circle 50 meters radius lines across standard runway spaced 100 meters apart runway least 10 meters wide Note two scores zero 10 may awarded landing sequence Ron Chidgey noted reason last rules clarification was intended takeoff landing per se critically 42 Model Aviation Rado Control Sport Aerobatics Ron Van Putte III Sleepy Oaks Rd Ft Walton Beach FL 32548 Van Putte 87 Nats Atlanta flewborrowed Paul Verger Lafayette LA Robert Aptel Niceville FL built nice Coverite Black Baron Specialbut tried cross us up decorating like Sort-A-Scale Peashooter also made Coverite Bill Cunningham Broken Arrow OK few FAI pilots author Van Puttes opinion can still takeoff land airplane well Ron has quite bit say about FAI scoring sequences months column judged new wording will continue make two-gear undercarriages grass contest sites viable alternatives initial response publishable family-oriented magazine big boys go ing continue poor takeoffs landings because have demon strate something resembling two sequences earn two lOs Consequently cant think rea son either sequence book likely reason pilot would get zero takeoff would engine flamed out case flight would over anyway Simi larly likely reason pilot would get zero landing would engine flamed out couldnt make landing zone gear leg failed Big deal thought points supposed awarded pilot proficien cy taken away bad luck Mysterious ways international rules gurus mail came announcement Mike Lauman did scoring F3A team selection finals Masters Tournament 1987 Nationals RC Pattern events offer ing distribute RC Pattern scoring software interested people package price $25 cludes program diskette users manual complete operating instructions supports 1988-89 AMA F3A Pattern events According Mike partial list program features includes 1 Up 500 contestants fly ing up eight rounds up mne classes up 24 judges per line 2 Runs IBMcompatible PC under PC-DOS MS-DOS requires minimum 256K RAM 3 Will run small contest 360K floppy drive large two 360K drives hard disk rec ommended optimum performance 4 Com pletely menu-driven self-explanatory user-friendly screens need computer person operate system 5 Streamlined data entry full-screen editing capability raw score entered two keystrokes including half-point scores An optional audit trail can printed flier 6 Handles freeform events such Masters class easily allows changing maneuver schedule time during contest 7 data stored disk entered power outages have minimal effect 8 Prints score sheets registration forms mailing labels contestant listings sorted name class frequency AMA number flight order 9 Prints current standings time showing round score combined total average order ranked highest lowest final score Mike goes describe possible scoring options including dropping high and/or low judge scores either maneuver flight dropping high and/or low round scores normalizing will maintain list purchasers program will keep informed new releases bugs found killed other pro gram activity youre interested send $25 check mon ey order Mike Lauman 150 Plum Tree Rd Brandon MS 39042 night phone number 601 992-1900 invites anyone call write information got another letter Tom Young Lakeville MN Tom signed letter Search Answers thought some excerpts letter questions swers would general interest Tom back RC after kids slowed flying time almost nothing currently has Continued page 133 Adjustable side frames free-flow ventilation Extremely light weight added comfort _____ Attractive case included frame fits comfortably over prescription glasses Blocks harmful ultraviolet radiation. Quartz mist coated scratch resistance Made entirely Polycarbonate impact protection ANSI Z871 specifications Available in Clear shop work $1325 Amber overcast days & late afternoons S14~ Gray $14~ & Mirror $19~ sunny days CA Mask $15~ Paint Mask S2O~ member club hit prop blade thrown 60 engine close range tip blade struck Safety Plus glasses saved him serious injury possibly loss eye incident convinced everyone should wear safety glasses near model airplane engines being run upEd Saul Secretary Treasurer Pikes Peak RC Club •A~ U hobby dealer first doesnt have what need order direct SAFETY PLUS PO Box 1173 Dept iM Clinton MS 39056 Ph 601 924-9640 Shipping & handling included Visa MasterCard accepted High Performance Models presents ECL IPSE Designed Henry Piorun Former Canadian National Champion & FAI Canadian Team Member Designed Specifically FAI Pattern Flying Perform Equally Well Other AMA Classes Plug Wings rglass Belly Pan Pie-Cut Hoies Wing Joiner Tubes Ultraiight Honeycomb Win gcores extra $35 Optional Plastic Fiberglass Canopy Fiberglass Fuselage molded wing Joiner tube HIGH PERFORMANCE MODELS 9566116 st. North Delta British Columbia 6Z4 Canada 604-588-0605 MB SMIflflHI Z1FDUDflZRD 7550 Sen Gob,oI Road cadeco CA 53422 456-1717 April 1988 43 PILOT GLASSES. HOW VALUABLE IS YOUR EYESIGHT Basic Kit $12500 Pre-Built Kit $32500 ladd $1500 S & H Send Check Money Order *975 AVAILABLE AT AMERICAS FINEST HOBBY SHOPS *975*525 DISTRIBUTED BY Centivoitmeter meter indicates centivolts what else would call meter shows 478 cV battery pack has terminal voltage 478 volts Id happier front panel marked cV instead Volts Either automatic decimal point should have provided Since Accu-Tach 2 indicates numbers small 10 mV can use Peak De tection Charging nickle-cadmium batteries set up charging rate will get job done 15 minutes watch battery terminal voltage see volt age rise above expected value drop two centivolts below what few seconds before charging complete must caution overcharging high rate can ruin battery must pay tention what doing should battery pack cool touch pack will get quite warm during charging should never get hot gets hot stays hot know youve just junked battery pack mix/match crowd can mea sure control pulses coming out receiver determine positive- negative-going can determine whether use some substitute servos Connect Common lead battery Negative Connect Positive Volts lead signal lead coming out receiver Push pin through servo pigtail necessary Now voltage shows about 25 cV looking positive-going pulses reads about 380 CV have negative-going pulses very rare Expanded-Scale Voltmeter Im sure people will use built-in resistors battery tests because thats con venient way using some unusu al battery size some alternatives available flight pack has less capacity usual such SR300 packs recommended Top Flite Wristocat put scale switch TX position current drawn pack will about 120 mA External shunts can fitted produce higher discharge currents would want customary discharge-test nickle-cadmium batteries rate equal one-half batterys rating example want test 1200 mAh flight pack discharging rate 600 mA should last two hours before terminal voltage drops 44 VDC other sizes packs consult following table find resistor can connected GR plug shunt RXTX COM ShuntResistor1011/lOw2012/lOw5011/lOw10012/lOw Radio Shack #271-1322 series271-1332 series Type cells RX1200 utAh900 mAh650 mAhna TX2400 mAh1200 mAk900 mAh650 utAh Note Shant resistors will get hot Gee Bee/Haffke Continued page 41 el reacts controls positively gently docile air will about thing care try will flying Gee Bee Scale competition will glad share documentation material Write list available photos Model Y variants Henry Hafjke 1038 W Elmer Road Vineland NJ 08360 RC Aerobatics/Van Putte Continued page 43 MK Curare 40 Rhom retracts pow ered piped 05 46 VF rear-exhaust engine Hes building MK Arrow 40 46 VF up front winter wants know advantage running 9 x 6 three-bladed prop 46 VF compared Master Airscrew 10 x 7 Ive running rpm going burn motor Out require lower-nitro fuel use 15%-nitro fuel honest real advantage Ive found using three-blade props lower prop diameter buys extra ground clearance really high-revving engines like 46 VF prop blade can actually operating wake blade ahead thereby reducing its efficiency right three-blade prop will often give same performance proper twoblade prop dont expect major surge power may Clarence Lee dont foresee engine burnout problem need try lower-nitro fuel However 15% fuel must cost bundle Ive using 5% years havent really noticed much loss power Torn goes does determine proper length tuned pipe April 1988 133 RAPIER 40-60 MADE IN THE USA PICAS CHALLENGE RAPIER CUTS THROUGH THE COMPETITION WITH 752 sq 1Advanced building technology57 2Straight forward all-balsa construction48 3Clear detailed instructions 45-6 lbs Full size plans40-60 2c 5Superb flight characteristics60-90 4c [v33][b-1-10-1-10]]Aa0 Wing Area Wing Span Fuse Length Functions Weight Engine Size SAFE FLYING IS NO ACCIDENT SEE YOUR DEALER FIRST U can help you can order direct us sending full price plus $200 handling U fee 116W 19th St POBox 6 Higginsville MO 64037 call 816 584-7121U U U U U U U U U EU... EEEEEEUEE -7mount pressure tap goes answers own questions what would have told him trial error using tach largest expansion area pipe Actually theres pretty good chart MACS published pipes can use get very close right dimensionseven someone elses pipes advice tuning pipe Dont get greedy far better have pipe slightly too long too short Another lesson learned hard way mentions having rebend landing gear after flight because operates off rough field gears bend quite easily common problem Im surprised solu tion hasnt spread through hobby word-of-mouth Maybe metallurgist can ex plain appears after landing gear strut coils wound wire will bend fairly easily either direction solution problem works well ss put gear struts very hot 500 O 5500 F oven half hour quench cold water cant explain metallurgist should write please gear strut becomes much rigid Moving right along Toms questions mechanical retracts work well pneu matic retracts mechanical systems use two retract servos tn-gear setup prefer mechanical retracts because dont want fuss pressure tank control valve pressure tubing dont mind bother stalling pushrods Theres no question pneu matic retracts easier install problems maintenance over life airplane mechanical retracts years used retract servo wing operating three mechanical retracts worked fairly well time last airplane put retract servo wing main gears fuselage nose gear will never again use retract servo Two retract servos much easier stall reliable operate can afford extra two ounces airplane weight costs Tom asked another question bound interesting people landing gears bend easily Does battery drain become problem wheel working Obviously wants know battery can drain down wheel gets hung up wheel well wont go way up back down answer Yes Gears bind up will cause servo operate its stall current can easily severai hundred milliamperes current Since typically fly 500- 800milliampere-hour mAh battery packs doesnt take long drain down strongest battery perfectly pwpurrunu ur modeling Curtlss Robin 049 Engines -Channel RIC 41 Wingspan Electric Power Optional $2206 Oh 003 Very few lull Scale aicaff ideally suited model flight appealing old curtiss Robin horn spruce lines age beautifully proportioned rubber elect nC glow engines Easy end fun build trainerlibe performance Flyline Models catalog 500phone 17031 2730003 FLYLINE MODELS INC V PO Box 2136 FaIrfax Virginia 22e31 USA pack Tom mentioned reason used Rhom pneumatic retracts avoid airborne battery problems Its valid point Toms last question dilly What servos top gun fliers use aileron elevator might think would consen sus manufacturer isnt know Futaba PCM fliers use JR 401 501 ser vos Similarly JR fliers like Fu taba 130 131 servos real consensus should get top-of-the-line servo aileron elevator Franidy lot nuances servo performance top guns can de tect lost rest us RC Scale/Wischers Continued page 45 cleaning spark plugs looking uni form texture scalelike impression Light airplanes sometimes use steel stampings scissors members model can formed aluminum steel hard alloys aluminum dont form well likely crack along sharp bend Aluminum fresh mill can formed reasonably sharp radius year later will orange peel crack along bend Thin steel may better choice wheel axles made 156-indiameter music wire bent inserted lower telescoping part shock strut Lowtemperature solder used secure wire strut Strength solder ample because large area wetted molten solder last assembly step after high-heat brazed joints have made avoid changing tem per music wire would greatly weak en retractable gears retract mechanism always provides suitable structure mounting models wing fuselage Fixed landing gears inserted holes drilled hardwood blocks birch maple preferred spread load over large area possible through spr rounding balsa plywood Steel rods 156-in music wire can passed through hardwood blocks extended rearwardfor example additional hardwood cemented rear spar wing trying spread landing loads large area type construction has used stand hundreds landings Scale models landings perfectly executed shock absorbing struts dissipate impact load model may bounce back air will survive bounce again amount bounce determined springs side struts can hand-wound pur 134 Model Aviation A-J INTERCEPTOR RTF $695 $495 NOn rL$00* *00 $0 00 roe pO$flC$ OooofluuOrIftShoofte$oOOEhS AmUIJU AIRCRAFT COMPANY PO Box 68132 Portland OR 97268 I-U U U U U U U U U U U U U U U U U U U U
Edition: Model Aviation - 1988/04
Page Numbers: 42, 43, 133, 134
SEVERAL years back FAI rules group delet ed scoring takeoff landing Since quality takeoffs landings FAI pilots has uniformly poor seldom missed chance harass FAI pilots suggesting should attend remedial takeoff landing school considerable glee greet ed announcement FAI pilots would again judged takeoff landing 1988 about get comeuppances got hold notice Ron Chidgey chairman FAIs ClAM F3A Sub committee sent US clubs subject F3A rules clarifications ef fective January 1 1988 first change involved changing position Figure M /2 rolls Square Loop /2 rolls flight sequence im prove presentation Half Reverse Cuban Eight second change Delete entire description including downgrades notes Maneuver No 1 Takeoff Sequence Maneu ver No 23 Landing Sequence descriptions replaced following 1 Takeoff Sequence model placed runway takes off turns 900 toward upwind marker approximately over marker model turns 2700 downwind trim pass approximately down wind marker model initiates 1800 turn reversal pilots choice Downgrades 1 Model does follow takeoff sequence zero points Note two scores zero 10 may awarded takeoff sequence 23 Landing Sequence reduced power model executes 1800 level descending turn downwind heading flies downwind leg turns 1800 wind Model flies descend ing approach runway touch ground landing zone landing sequence com plete model has rolled 10 meters Downgrades 1 Model does follow land ing sequence zero points 2 undercarriage leg retracts landing zero points 3 model lands outside landing zone zero points landing zone may designated circle 50 meters radius lines across standard runway spaced 100 meters apart runway least 10 meters wide Note two scores zero 10 may awarded landing sequence Ron Chidgey noted reason last rules clarification was intended takeoff landing per se critically 42 Model Aviation Rado Control Sport Aerobatics Ron Van Putte III Sleepy Oaks Rd Ft Walton Beach FL 32548 Van Putte 87 Nats Atlanta flewborrowed Paul Verger Lafayette LA Robert Aptel Niceville FL built nice Coverite Black Baron Specialbut tried cross us up decorating like Sort-A-Scale Peashooter also made Coverite Bill Cunningham Broken Arrow OK few FAI pilots author Van Puttes opinion can still takeoff land airplane well Ron has quite bit say about FAI scoring sequences months column judged new wording will continue make two-gear undercarriages grass contest sites viable alternatives initial response publishable family-oriented magazine big boys go ing continue poor takeoffs landings because have demon strate something resembling two sequences earn two lOs Consequently cant think rea son either sequence book likely reason pilot would get zero takeoff would engine flamed out case flight would over anyway Simi larly likely reason pilot would get zero landing would engine flamed out couldnt make landing zone gear leg failed Big deal thought points supposed awarded pilot proficien cy taken away bad luck Mysterious ways international rules gurus mail came announcement Mike Lauman did scoring F3A team selection finals Masters Tournament 1987 Nationals RC Pattern events offer ing distribute RC Pattern scoring software interested people package price $25 cludes program diskette users manual complete operating instructions supports 1988-89 AMA F3A Pattern events According Mike partial list program features includes 1 Up 500 contestants fly ing up eight rounds up mne classes up 24 judges per line 2 Runs IBMcompatible PC under PC-DOS MS-DOS requires minimum 256K RAM 3 Will run small contest 360K floppy drive large two 360K drives hard disk rec ommended optimum performance 4 Com pletely menu-driven self-explanatory user-friendly screens need computer person operate system 5 Streamlined data entry full-screen editing capability raw score entered two keystrokes including half-point scores An optional audit trail can printed flier 6 Handles freeform events such Masters class easily allows changing maneuver schedule time during contest 7 data stored disk entered power outages have minimal effect 8 Prints score sheets registration forms mailing labels contestant listings sorted name class frequency AMA number flight order 9 Prints current standings time showing round score combined total average order ranked highest lowest final score Mike goes describe possible scoring options including dropping high and/or low judge scores either maneuver flight dropping high and/or low round scores normalizing will maintain list purchasers program will keep informed new releases bugs found killed other pro gram activity youre interested send $25 check mon ey order Mike Lauman 150 Plum Tree Rd Brandon MS 39042 night phone number 601 992-1900 invites anyone call write information got another letter Tom Young Lakeville MN Tom signed letter Search Answers thought some excerpts letter questions swers would general interest Tom back RC after kids slowed flying time almost nothing currently has Continued page 133 Adjustable side frames free-flow ventilation Extremely light weight added comfort _____ Attractive case included frame fits comfortably over prescription glasses Blocks harmful ultraviolet radiation. Quartz mist coated scratch resistance Made entirely Polycarbonate impact protection ANSI Z871 specifications Available in Clear shop work $1325 Amber overcast days & late afternoons S14~ Gray $14~ & Mirror $19~ sunny days CA Mask $15~ Paint Mask S2O~ member club hit prop blade thrown 60 engine close range tip blade struck Safety Plus glasses saved him serious injury possibly loss eye incident convinced everyone should wear safety glasses near model airplane engines being run upEd Saul Secretary Treasurer Pikes Peak RC Club •A~ U hobby dealer first doesnt have what need order direct SAFETY PLUS PO Box 1173 Dept iM Clinton MS 39056 Ph 601 924-9640 Shipping & handling included Visa MasterCard accepted High Performance Models presents ECL IPSE Designed Henry Piorun Former Canadian National Champion & FAI Canadian Team Member Designed Specifically FAI Pattern Flying Perform Equally Well Other AMA Classes Plug Wings rglass Belly Pan Pie-Cut Hoies Wing Joiner Tubes Ultraiight Honeycomb Win gcores extra $35 Optional Plastic Fiberglass Canopy Fiberglass Fuselage molded wing Joiner tube HIGH PERFORMANCE MODELS 9566116 st. North Delta British Columbia 6Z4 Canada 604-588-0605 MB SMIflflHI Z1FDUDflZRD 7550 Sen Gob,oI Road cadeco CA 53422 456-1717 April 1988 43 PILOT GLASSES. HOW VALUABLE IS YOUR EYESIGHT Basic Kit $12500 Pre-Built Kit $32500 ladd $1500 S & H Send Check Money Order *975 AVAILABLE AT AMERICAS FINEST HOBBY SHOPS *975*525 DISTRIBUTED BY Centivoitmeter meter indicates centivolts what else would call meter shows 478 cV battery pack has terminal voltage 478 volts Id happier front panel marked cV instead Volts Either automatic decimal point should have provided Since Accu-Tach 2 indicates numbers small 10 mV can use Peak De tection Charging nickle-cadmium batteries set up charging rate will get job done 15 minutes watch battery terminal voltage see volt age rise above expected value drop two centivolts below what few seconds before charging complete must caution overcharging high rate can ruin battery must pay tention what doing should battery pack cool touch pack will get quite warm during charging should never get hot gets hot stays hot know youve just junked battery pack mix/match crowd can mea sure control pulses coming out receiver determine positive- negative-going can determine whether use some substitute servos Connect Common lead battery Negative Connect Positive Volts lead signal lead coming out receiver Push pin through servo pigtail necessary Now voltage shows about 25 cV looking positive-going pulses reads about 380 CV have negative-going pulses very rare Expanded-Scale Voltmeter Im sure people will use built-in resistors battery tests because thats con venient way using some unusu al battery size some alternatives available flight pack has less capacity usual such SR300 packs recommended Top Flite Wristocat put scale switch TX position current drawn pack will about 120 mA External shunts can fitted produce higher discharge currents would want customary discharge-test nickle-cadmium batteries rate equal one-half batterys rating example want test 1200 mAh flight pack discharging rate 600 mA should last two hours before terminal voltage drops 44 VDC other sizes packs consult following table find resistor can connected GR plug shunt RXTX COM ShuntResistor1011/lOw2012/lOw5011/lOw10012/lOw Radio Shack #271-1322 series271-1332 series Type cells RX1200 utAh900 mAh650 mAhna TX2400 mAh1200 mAk900 mAh650 utAh Note Shant resistors will get hot Gee Bee/Haffke Continued page 41 el reacts controls positively gently docile air will about thing care try will flying Gee Bee Scale competition will glad share documentation material Write list available photos Model Y variants Henry Hafjke 1038 W Elmer Road Vineland NJ 08360 RC Aerobatics/Van Putte Continued page 43 MK Curare 40 Rhom retracts pow ered piped 05 46 VF rear-exhaust engine Hes building MK Arrow 40 46 VF up front winter wants know advantage running 9 x 6 three-bladed prop 46 VF compared Master Airscrew 10 x 7 Ive running rpm going burn motor Out require lower-nitro fuel use 15%-nitro fuel honest real advantage Ive found using three-blade props lower prop diameter buys extra ground clearance really high-revving engines like 46 VF prop blade can actually operating wake blade ahead thereby reducing its efficiency right three-blade prop will often give same performance proper twoblade prop dont expect major surge power may Clarence Lee dont foresee engine burnout problem need try lower-nitro fuel However 15% fuel must cost bundle Ive using 5% years havent really noticed much loss power Torn goes does determine proper length tuned pipe April 1988 133 RAPIER 40-60 MADE IN THE USA PICAS CHALLENGE RAPIER CUTS THROUGH THE COMPETITION WITH 752 sq 1Advanced building technology57 2Straight forward all-balsa construction48 3Clear detailed instructions 45-6 lbs Full size plans40-60 2c 5Superb flight characteristics60-90 4c [v33][b-1-10-1-10]]Aa0 Wing Area Wing Span Fuse Length Functions Weight Engine Size SAFE FLYING IS NO ACCIDENT SEE YOUR DEALER FIRST U can help you can order direct us sending full price plus $200 handling U fee 116W 19th St POBox 6 Higginsville MO 64037 call 816 584-7121U U U U U U U U U EU... EEEEEEUEE -7mount pressure tap goes answers own questions what would have told him trial error using tach largest expansion area pipe Actually theres pretty good chart MACS published pipes can use get very close right dimensionseven someone elses pipes advice tuning pipe Dont get greedy far better have pipe slightly too long too short Another lesson learned hard way mentions having rebend landing gear after flight because operates off rough field gears bend quite easily common problem Im surprised solu tion hasnt spread through hobby word-of-mouth Maybe metallurgist can ex plain appears after landing gear strut coils wound wire will bend fairly easily either direction solution problem works well ss put gear struts very hot 500 O 5500 F oven half hour quench cold water cant explain metallurgist should write please gear strut becomes much rigid Moving right along Toms questions mechanical retracts work well pneu matic retracts mechanical systems use two retract servos tn-gear setup prefer mechanical retracts because dont want fuss pressure tank control valve pressure tubing dont mind bother stalling pushrods Theres no question pneu matic retracts easier install problems maintenance over life airplane mechanical retracts years used retract servo wing operating three mechanical retracts worked fairly well time last airplane put retract servo wing main gears fuselage nose gear will never again use retract servo Two retract servos much easier stall reliable operate can afford extra two ounces airplane weight costs Tom asked another question bound interesting people landing gears bend easily Does battery drain become problem wheel working Obviously wants know battery can drain down wheel gets hung up wheel well wont go way up back down answer Yes Gears bind up will cause servo operate its stall current can easily severai hundred milliamperes current Since typically fly 500- 800milliampere-hour mAh battery packs doesnt take long drain down strongest battery perfectly pwpurrunu ur modeling Curtlss Robin 049 Engines -Channel RIC 41 Wingspan Electric Power Optional $2206 Oh 003 Very few lull Scale aicaff ideally suited model flight appealing old curtiss Robin horn spruce lines age beautifully proportioned rubber elect nC glow engines Easy end fun build trainerlibe performance Flyline Models catalog 500phone 17031 2730003 FLYLINE MODELS INC V PO Box 2136 FaIrfax Virginia 22e31 USA pack Tom mentioned reason used Rhom pneumatic retracts avoid airborne battery problems Its valid point Toms last question dilly What servos top gun fliers use aileron elevator might think would consen sus manufacturer isnt know Futaba PCM fliers use JR 401 501 ser vos Similarly JR fliers like Fu taba 130 131 servos real consensus should get top-of-the-line servo aileron elevator Franidy lot nuances servo performance top guns can de tect lost rest us RC Scale/Wischers Continued page 45 cleaning spark plugs looking uni form texture scalelike impression Light airplanes sometimes use steel stampings scissors members model can formed aluminum steel hard alloys aluminum dont form well likely crack along sharp bend Aluminum fresh mill can formed reasonably sharp radius year later will orange peel crack along bend Thin steel may better choice wheel axles made 156-indiameter music wire bent inserted lower telescoping part shock strut Lowtemperature solder used secure wire strut Strength solder ample because large area wetted molten solder last assembly step after high-heat brazed joints have made avoid changing tem per music wire would greatly weak en retractable gears retract mechanism always provides suitable structure mounting models wing fuselage Fixed landing gears inserted holes drilled hardwood blocks birch maple preferred spread load over large area possible through spr rounding balsa plywood Steel rods 156-in music wire can passed through hardwood blocks extended rearwardfor example additional hardwood cemented rear spar wing trying spread landing loads large area type construction has used stand hundreds landings Scale models landings perfectly executed shock absorbing struts dissipate impact load model may bounce back air will survive bounce again amount bounce determined springs side struts can hand-wound pur 134 Model Aviation A-J INTERCEPTOR RTF $695 $495 NOn rL$00* *00 $0 00 roe pO$flC$ OooofluuOrIftShoofte$oOOEhS AmUIJU AIRCRAFT COMPANY PO Box 68132 Portland OR 97268 I-U U U U U U U U U U U U U U U U U U U U
Edition: Model Aviation - 1988/04
Page Numbers: 42, 43, 133, 134
SEVERAL years back FAI rules group delet ed scoring takeoff landing Since quality takeoffs landings FAI pilots has uniformly poor seldom missed chance harass FAI pilots suggesting should attend remedial takeoff landing school considerable glee greet ed announcement FAI pilots would again judged takeoff landing 1988 about get comeuppances got hold notice Ron Chidgey chairman FAIs ClAM F3A Sub committee sent US clubs subject F3A rules clarifications ef fective January 1 1988 first change involved changing position Figure M /2 rolls Square Loop /2 rolls flight sequence im prove presentation Half Reverse Cuban Eight second change Delete entire description including downgrades notes Maneuver No 1 Takeoff Sequence Maneu ver No 23 Landing Sequence descriptions replaced following 1 Takeoff Sequence model placed runway takes off turns 900 toward upwind marker approximately over marker model turns 2700 downwind trim pass approximately down wind marker model initiates 1800 turn reversal pilots choice Downgrades 1 Model does follow takeoff sequence zero points Note two scores zero 10 may awarded takeoff sequence 23 Landing Sequence reduced power model executes 1800 level descending turn downwind heading flies downwind leg turns 1800 wind Model flies descend ing approach runway touch ground landing zone landing sequence com plete model has rolled 10 meters Downgrades 1 Model does follow land ing sequence zero points 2 undercarriage leg retracts landing zero points 3 model lands outside landing zone zero points landing zone may designated circle 50 meters radius lines across standard runway spaced 100 meters apart runway least 10 meters wide Note two scores zero 10 may awarded landing sequence Ron Chidgey noted reason last rules clarification was intended takeoff landing per se critically 42 Model Aviation Rado Control Sport Aerobatics Ron Van Putte III Sleepy Oaks Rd Ft Walton Beach FL 32548 Van Putte 87 Nats Atlanta flewborrowed Paul Verger Lafayette LA Robert Aptel Niceville FL built nice Coverite Black Baron Specialbut tried cross us up decorating like Sort-A-Scale Peashooter also made Coverite Bill Cunningham Broken Arrow OK few FAI pilots author Van Puttes opinion can still takeoff land airplane well Ron has quite bit say about FAI scoring sequences months column judged new wording will continue make two-gear undercarriages grass contest sites viable alternatives initial response publishable family-oriented magazine big boys go ing continue poor takeoffs landings because have demon strate something resembling two sequences earn two lOs Consequently cant think rea son either sequence book likely reason pilot would get zero takeoff would engine flamed out case flight would over anyway Simi larly likely reason pilot would get zero landing would engine flamed out couldnt make landing zone gear leg failed Big deal thought points supposed awarded pilot proficien cy taken away bad luck Mysterious ways international rules gurus mail came announcement Mike Lauman did scoring F3A team selection finals Masters Tournament 1987 Nationals RC Pattern events offer ing distribute RC Pattern scoring software interested people package price $25 cludes program diskette users manual complete operating instructions supports 1988-89 AMA F3A Pattern events According Mike partial list program features includes 1 Up 500 contestants fly ing up eight rounds up mne classes up 24 judges per line 2 Runs IBMcompatible PC under PC-DOS MS-DOS requires minimum 256K RAM 3 Will run small contest 360K floppy drive large two 360K drives hard disk rec ommended optimum performance 4 Com pletely menu-driven self-explanatory user-friendly screens need computer person operate system 5 Streamlined data entry full-screen editing capability raw score entered two keystrokes including half-point scores An optional audit trail can printed flier 6 Handles freeform events such Masters class easily allows changing maneuver schedule time during contest 7 data stored disk entered power outages have minimal effect 8 Prints score sheets registration forms mailing labels contestant listings sorted name class frequency AMA number flight order 9 Prints current standings time showing round score combined total average order ranked highest lowest final score Mike goes describe possible scoring options including dropping high and/or low judge scores either maneuver flight dropping high and/or low round scores normalizing will maintain list purchasers program will keep informed new releases bugs found killed other pro gram activity youre interested send $25 check mon ey order Mike Lauman 150 Plum Tree Rd Brandon MS 39042 night phone number 601 992-1900 invites anyone call write information got another letter Tom Young Lakeville MN Tom signed letter Search Answers thought some excerpts letter questions swers would general interest Tom back RC after kids slowed flying time almost nothing currently has Continued page 133 Adjustable side frames free-flow ventilation Extremely light weight added comfort _____ Attractive case included frame fits comfortably over prescription glasses Blocks harmful ultraviolet radiation. Quartz mist coated scratch resistance Made entirely Polycarbonate impact protection ANSI Z871 specifications Available in Clear shop work $1325 Amber overcast days & late afternoons S14~ Gray $14~ & Mirror $19~ sunny days CA Mask $15~ Paint Mask S2O~ member club hit prop blade thrown 60 engine close range tip blade struck Safety Plus glasses saved him serious injury possibly loss eye incident convinced everyone should wear safety glasses near model airplane engines being run upEd Saul Secretary Treasurer Pikes Peak RC Club •A~ U hobby dealer first doesnt have what need order direct SAFETY PLUS PO Box 1173 Dept iM Clinton MS 39056 Ph 601 924-9640 Shipping & handling included Visa MasterCard accepted High Performance Models presents ECL IPSE Designed Henry Piorun Former Canadian National Champion & FAI Canadian Team Member Designed Specifically FAI Pattern Flying Perform Equally Well Other AMA Classes Plug Wings rglass Belly Pan Pie-Cut Hoies Wing Joiner Tubes Ultraiight Honeycomb Win gcores extra $35 Optional Plastic Fiberglass Canopy Fiberglass Fuselage molded wing Joiner tube HIGH PERFORMANCE MODELS 9566116 st. North Delta British Columbia 6Z4 Canada 604-588-0605 MB SMIflflHI Z1FDUDflZRD 7550 Sen Gob,oI Road cadeco CA 53422 456-1717 April 1988 43 PILOT GLASSES. HOW VALUABLE IS YOUR EYESIGHT Basic Kit $12500 Pre-Built Kit $32500 ladd $1500 S & H Send Check Money Order *975 AVAILABLE AT AMERICAS FINEST HOBBY SHOPS *975*525 DISTRIBUTED BY Centivoitmeter meter indicates centivolts what else would call meter shows 478 cV battery pack has terminal voltage 478 volts Id happier front panel marked cV instead Volts Either automatic decimal point should have provided Since Accu-Tach 2 indicates numbers small 10 mV can use Peak De tection Charging nickle-cadmium batteries set up charging rate will get job done 15 minutes watch battery terminal voltage see volt age rise above expected value drop two centivolts below what few seconds before charging complete must caution overcharging high rate can ruin battery must pay tention what doing should battery pack cool touch pack will get quite warm during charging should never get hot gets hot stays hot know youve just junked battery pack mix/match crowd can mea sure control pulses coming out receiver determine positive- negative-going can determine whether use some substitute servos Connect Common lead battery Negative Connect Positive Volts lead signal lead coming out receiver Push pin through servo pigtail necessary Now voltage shows about 25 cV looking positive-going pulses reads about 380 CV have negative-going pulses very rare Expanded-Scale Voltmeter Im sure people will use built-in resistors battery tests because thats con venient way using some unusu al battery size some alternatives available flight pack has less capacity usual such SR300 packs recommended Top Flite Wristocat put scale switch TX position current drawn pack will about 120 mA External shunts can fitted produce higher discharge currents would want customary discharge-test nickle-cadmium batteries rate equal one-half batterys rating example want test 1200 mAh flight pack discharging rate 600 mA should last two hours before terminal voltage drops 44 VDC other sizes packs consult following table find resistor can connected GR plug shunt RXTX COM ShuntResistor1011/lOw2012/lOw5011/lOw10012/lOw Radio Shack #271-1322 series271-1332 series Type cells RX1200 utAh900 mAh650 mAhna TX2400 mAh1200 mAk900 mAh650 utAh Note Shant resistors will get hot Gee Bee/Haffke Continued page 41 el reacts controls positively gently docile air will about thing care try will flying Gee Bee Scale competition will glad share documentation material Write list available photos Model Y variants Henry Hafjke 1038 W Elmer Road Vineland NJ 08360 RC Aerobatics/Van Putte Continued page 43 MK Curare 40 Rhom retracts pow ered piped 05 46 VF rear-exhaust engine Hes building MK Arrow 40 46 VF up front winter wants know advantage running 9 x 6 three-bladed prop 46 VF compared Master Airscrew 10 x 7 Ive running rpm going burn motor Out require lower-nitro fuel use 15%-nitro fuel honest real advantage Ive found using three-blade props lower prop diameter buys extra ground clearance really high-revving engines like 46 VF prop blade can actually operating wake blade ahead thereby reducing its efficiency right three-blade prop will often give same performance proper twoblade prop dont expect major surge power may Clarence Lee dont foresee engine burnout problem need try lower-nitro fuel However 15% fuel must cost bundle Ive using 5% years havent really noticed much loss power Torn goes does determine proper length tuned pipe April 1988 133 RAPIER 40-60 MADE IN THE USA PICAS CHALLENGE RAPIER CUTS THROUGH THE COMPETITION WITH 752 sq 1Advanced building technology57 2Straight forward all-balsa construction48 3Clear detailed instructions 45-6 lbs Full size plans40-60 2c 5Superb flight characteristics60-90 4c [v33][b-1-10-1-10]]Aa0 Wing Area Wing Span Fuse Length Functions Weight Engine Size SAFE FLYING IS NO ACCIDENT SEE YOUR DEALER FIRST U can help you can order direct us sending full price plus $200 handling U fee 116W 19th St POBox 6 Higginsville MO 64037 call 816 584-7121U U U U U U U U U EU... EEEEEEUEE -7mount pressure tap goes answers own questions what would have told him trial error using tach largest expansion area pipe Actually theres pretty good chart MACS published pipes can use get very close right dimensionseven someone elses pipes advice tuning pipe Dont get greedy far better have pipe slightly too long too short Another lesson learned hard way mentions having rebend landing gear after flight because operates off rough field gears bend quite easily common problem Im surprised solu tion hasnt spread through hobby word-of-mouth Maybe metallurgist can ex plain appears after landing gear strut coils wound wire will bend fairly easily either direction solution problem works well ss put gear struts very hot 500 O 5500 F oven half hour quench cold water cant explain metallurgist should write please gear strut becomes much rigid Moving right along Toms questions mechanical retracts work well pneu matic retracts mechanical systems use two retract servos tn-gear setup prefer mechanical retracts because dont want fuss pressure tank control valve pressure tubing dont mind bother stalling pushrods Theres no question pneu matic retracts easier install problems maintenance over life airplane mechanical retracts years used retract servo wing operating three mechanical retracts worked fairly well time last airplane put retract servo wing main gears fuselage nose gear will never again use retract servo Two retract servos much easier stall reliable operate can afford extra two ounces airplane weight costs Tom asked another question bound interesting people landing gears bend easily Does battery drain become problem wheel working Obviously wants know battery can drain down wheel gets hung up wheel well wont go way up back down answer Yes Gears bind up will cause servo operate its stall current can easily severai hundred milliamperes current Since typically fly 500- 800milliampere-hour mAh battery packs doesnt take long drain down strongest battery perfectly pwpurrunu ur modeling Curtlss Robin 049 Engines -Channel RIC 41 Wingspan Electric Power Optional $2206 Oh 003 Very few lull Scale aicaff ideally suited model flight appealing old curtiss Robin horn spruce lines age beautifully proportioned rubber elect nC glow engines Easy end fun build trainerlibe performance Flyline Models catalog 500phone 17031 2730003 FLYLINE MODELS INC V PO Box 2136 FaIrfax Virginia 22e31 USA pack Tom mentioned reason used Rhom pneumatic retracts avoid airborne battery problems Its valid point Toms last question dilly What servos top gun fliers use aileron elevator might think would consen sus manufacturer isnt know Futaba PCM fliers use JR 401 501 ser vos Similarly JR fliers like Fu taba 130 131 servos real consensus should get top-of-the-line servo aileron elevator Franidy lot nuances servo performance top guns can de tect lost rest us RC Scale/Wischers Continued page 45 cleaning spark plugs looking uni form texture scalelike impression Light airplanes sometimes use steel stampings scissors members model can formed aluminum steel hard alloys aluminum dont form well likely crack along sharp bend Aluminum fresh mill can formed reasonably sharp radius year later will orange peel crack along bend Thin steel may better choice wheel axles made 156-indiameter music wire bent inserted lower telescoping part shock strut Lowtemperature solder used secure wire strut Strength solder ample because large area wetted molten solder last assembly step after high-heat brazed joints have made avoid changing tem per music wire would greatly weak en retractable gears retract mechanism always provides suitable structure mounting models wing fuselage Fixed landing gears inserted holes drilled hardwood blocks birch maple preferred spread load over large area possible through spr rounding balsa plywood Steel rods 156-in music wire can passed through hardwood blocks extended rearwardfor example additional hardwood cemented rear spar wing trying spread landing loads large area type construction has used stand hundreds landings Scale models landings perfectly executed shock absorbing struts dissipate impact load model may bounce back air will survive bounce again amount bounce determined springs side struts can hand-wound pur 134 Model Aviation A-J INTERCEPTOR RTF $695 $495 NOn rL$00* *00 $0 00 roe pO$flC$ OooofluuOrIftShoofte$oOOEhS AmUIJU AIRCRAFT COMPANY PO Box 68132 Portland OR 97268 I-U U U U U U U U U U U U U U U U U U U U