Radio Control Sport/Aerobatics WHEN MY WIFE finished last months column eve leaving attend RC World Championships Bern Switzerland plan fly free military chartered aircraft what called space available status fringe benefit avail able military personnel Unfortunately suddenly hecame apparent no space available prospect $1200 additional cost make trip forced cancel lation travel plans placed Model Aviation hind because have cov ered event magazine made decision difficult make months column almost didnt get written because uninvited female guest named Eloise hurricane came marching through just after daybreak few days ago messed up much Florida panhandle yard full broken trees alumi num storage shed ended up against several trees two blocks over house slightly damaged So since family still piece sun shining again lets move column Some months ago promised future columns would contain discussions effects wind aircraft As aware suhject favorite topic RC fliers has controversy about Im going attempt treat problem rationally stating some facts making few assumptions presenting conclusions Rational responses readers column welcomed solicited reserve right ignore bombasts anyone almost didnt write anything subject following publication excellent article Alex Finlay entitled Airplanes Ron Van Putte START Fly appeared August 1975 issue Radio Control Modeler article well written agree nearly thing contained some facets want treat own way kind wind effects discussed effects due wind direction speed constant effects wind gusts airplanes much complex should discussed after effects steady wind have covered motion airplanes governed physical laws must applied according proper frame reference law has heard misinterpret Newtons second law motion F isinterpretations often occur because tempts apply law situation using improper frame reference Simply stated law may applied relative fixed frame reference moving constant velocity ie constant speed direction enables law applied frame reference moves same velocity steady wind reason can say airborne airplane doesnt know wind blowing also WITH WIND ND WIND t WIND DIRECTION FIGURE 1 allows ground track airplane plotted superimposing effect wind top solution its motion relative moving frame Let get few assumptions established before attempting describe what happens during some typical maneuvers assumed airplane flying straight level full throttle maximum speed just prior starting maneuver means airplane must change speed altitude load factor change example ma neuver involves climb pulling gs airplane will slow down Another assumption airplane performing coordinated ma neuvers generally true properlyflown airplanes ruddy-only ones because severely side-slipping airplane doesnt look natural flier continued page 66 Above Goldberg Skylane kit built Dale Wheeler OS Max power Jerry Farr picl Left Slightly larger 3 feet biplane Norm Rosen stock features adjustable wing incidence via nylon screws Veco 19 Below Jim Griffin removed needle valve assembly Cox TD 049 installed OS Max 10 RC carburetor works great Shown test stand using ordinary plastic bottle trial runs x DAVE LINSTRUMS STARSTREAM 0 ULTRA SIMPLE CONSTRUCTION ALL BALSA AND PLY PARTS MACHINE OR DIE CUT 48 INCH WINGSPAN AUTO-RUDDER CONTROL FULL SIZE ILLUSTRATED STEP BY STEP PLAN FLYING INSTRUCTIONS WINNER OF THE FAI/CIAMINCLUDED INTERNATIONAL DESIGN $1195 COMPETITION FOR YOUTH GLIDEF IDWEST PRODUCTS CO 400 South Indiana StHobartIndiana 46342 RC Sport/Van Putte continued page 18 Fig 1 shows what happens ground track airplane turn varying wind conditions load factor held con stant level coordinated turn load factor directly related bank angle aircraft very simple equation Load Factor X Cosine Bank Angle ll 3600 turn shown demonstrate what hap pens both downwind upwind turn figure can also used visualize what happens during turns wind make seem dangerous Consider first airplane going downwind starts 1800 turn pilot notes airplane going fur ther downwind desires increases bank angle load factor What may happen next pilot will continue increase bank angle until airplane stalls out crashes what about airplane going upwind starts 1800 turn pilot banks airplane comfortable no-wind bank angle discovers heading relative speed airplane suddenly changing much rapidly expected loses orientation over-rolls airplane ground Neither maneuver inherently dangerous lack understanding about what air plane will wind can severely unsettle pilot particularly beginner lowspeed trainer airplane since effects wind greater slower airplanes two things remember flying wind 1 Increase bank angle over normal amount turn downwind heading made Gradually reduce bank angle airplane swings wind 2 Decrease bank angle no-wind amount turn upwind heading made Gradually increase bank angle airplane comes around downwind Try it works Next month Ill present some wind effects vertical maneuvers last few weeks have testing new product called PoweR/Charge SP Systems Marietta Ga combined nickel-cadmium battery discharger-charger field tester havent made com prehensive test unit seems advertised have used batteries two radio systems old questionable airborne pack cases PoweR/Charge progressively increased discharge time indicating increased capacity Especially striking capacity increase old battery pack After initial charge old 475-ma pack should have discharged least 2 hours 10 minutes first discharge lasted 1 hour 40 minutes second dis charge 2 hours 4 minutes third dis charge lasted 2 hours 20 minutes Subsequent discharges pack hovered around 2 hours 30 minutes Similar less startling capacity increases occurred other battery packs tested future com prehensive review will published Have seen new book beginners called Basics Radio Control Modeling Fred Marks co-authors book Model Aviation editor Bill Winter Fred town couple weeks ago business pre sented copy review remarkably well done piece work book includes chapters tools materials radio equipment engines airplanes boats cars other models like way its written photography has quality often seen model publications address 12 Connie Dr Shalimar Fla 32579 FF Duration/Meuser continued page 43 can purchased $695 can buy individual parts unit accommodates Forster 29 O&R 23 K&B Torpedo primarily flying parts nicely polished unit makes attractive display too Weight 294 gramsa thin hair over ounceand overall length 2 info write Jim 1442 N Fruit Ave Fresno CA 93728 Call Papers National Free Flight Society soliciting papers 1976 NFFS Symposium held 1976 Nats Papers will published 1976 Symposium vol ume whether author able present paper personally Nats Papers should cover some aspect science art free-flight models including technical studies practical design engineering applied models new unusual model aircraft developments historical items Both indoor outdoor freeflight modeling developments included Please send proposed papers Ray Harlan 15 Happy Hollow Rd Wayland Mass 01778 Send title proposed paper together abstract 200 words or complete paper available considered ab stracts should submitted Feb 15 1976 Book Review A ero -Modeller Annual 1975-76 review general model aviation book free-flight column Well well skip RC CL stuff judge solely its free-flight content sign times perhaps first Annual Ive seen paperback price has doubled two years UK price trans lates $450 what actual USA price will remains seen Compared what get money buy say $600 worth magazines imagine will judge worth money drawings A P Lloyd usual top quality Most model plans have appeared other publications would have subscribe magazine news letter world have seen before plans count includes 17 FAI-class models smattering others Most articles original about dozen directly related free flight including series three finishing overview Pennyplane activity world-wide plenty plans Dave Lin strum photo-story covering dozen unusual engines such Elf flat-six rotary valve four-stroke Dooling turned 28000 rpm cover other John Daddy Warbucks Pond himself complete Old-Timer course SAM 01 license plate address 4200 Gregory St Oakland Calif 94619 66 Model Aviation
Edition: Model Aviation - 1976/01
Page Numbers: 18, 66
Radio Control Sport/Aerobatics WHEN MY WIFE finished last months column eve leaving attend RC World Championships Bern Switzerland plan fly free military chartered aircraft what called space available status fringe benefit avail able military personnel Unfortunately suddenly hecame apparent no space available prospect $1200 additional cost make trip forced cancel lation travel plans placed Model Aviation hind because have cov ered event magazine made decision difficult make months column almost didnt get written because uninvited female guest named Eloise hurricane came marching through just after daybreak few days ago messed up much Florida panhandle yard full broken trees alumi num storage shed ended up against several trees two blocks over house slightly damaged So since family still piece sun shining again lets move column Some months ago promised future columns would contain discussions effects wind aircraft As aware suhject favorite topic RC fliers has controversy about Im going attempt treat problem rationally stating some facts making few assumptions presenting conclusions Rational responses readers column welcomed solicited reserve right ignore bombasts anyone almost didnt write anything subject following publication excellent article Alex Finlay entitled Airplanes Ron Van Putte START Fly appeared August 1975 issue Radio Control Modeler article well written agree nearly thing contained some facets want treat own way kind wind effects discussed effects due wind direction speed constant effects wind gusts airplanes much complex should discussed after effects steady wind have covered motion airplanes governed physical laws must applied according proper frame reference law has heard misinterpret Newtons second law motion F isinterpretations often occur because tempts apply law situation using improper frame reference Simply stated law may applied relative fixed frame reference moving constant velocity ie constant speed direction enables law applied frame reference moves same velocity steady wind reason can say airborne airplane doesnt know wind blowing also WITH WIND ND WIND t WIND DIRECTION FIGURE 1 allows ground track airplane plotted superimposing effect wind top solution its motion relative moving frame Let get few assumptions established before attempting describe what happens during some typical maneuvers assumed airplane flying straight level full throttle maximum speed just prior starting maneuver means airplane must change speed altitude load factor change example ma neuver involves climb pulling gs airplane will slow down Another assumption airplane performing coordinated ma neuvers generally true properlyflown airplanes ruddy-only ones because severely side-slipping airplane doesnt look natural flier continued page 66 Above Goldberg Skylane kit built Dale Wheeler OS Max power Jerry Farr picl Left Slightly larger 3 feet biplane Norm Rosen stock features adjustable wing incidence via nylon screws Veco 19 Below Jim Griffin removed needle valve assembly Cox TD 049 installed OS Max 10 RC carburetor works great Shown test stand using ordinary plastic bottle trial runs x DAVE LINSTRUMS STARSTREAM 0 ULTRA SIMPLE CONSTRUCTION ALL BALSA AND PLY PARTS MACHINE OR DIE CUT 48 INCH WINGSPAN AUTO-RUDDER CONTROL FULL SIZE ILLUSTRATED STEP BY STEP PLAN FLYING INSTRUCTIONS WINNER OF THE FAI/CIAMINCLUDED INTERNATIONAL DESIGN $1195 COMPETITION FOR YOUTH GLIDEF IDWEST PRODUCTS CO 400 South Indiana StHobartIndiana 46342 RC Sport/Van Putte continued page 18 Fig 1 shows what happens ground track airplane turn varying wind conditions load factor held con stant level coordinated turn load factor directly related bank angle aircraft very simple equation Load Factor X Cosine Bank Angle ll 3600 turn shown demonstrate what hap pens both downwind upwind turn figure can also used visualize what happens during turns wind make seem dangerous Consider first airplane going downwind starts 1800 turn pilot notes airplane going fur ther downwind desires increases bank angle load factor What may happen next pilot will continue increase bank angle until airplane stalls out crashes what about airplane going upwind starts 1800 turn pilot banks airplane comfortable no-wind bank angle discovers heading relative speed airplane suddenly changing much rapidly expected loses orientation over-rolls airplane ground Neither maneuver inherently dangerous lack understanding about what air plane will wind can severely unsettle pilot particularly beginner lowspeed trainer airplane since effects wind greater slower airplanes two things remember flying wind 1 Increase bank angle over normal amount turn downwind heading made Gradually reduce bank angle airplane swings wind 2 Decrease bank angle no-wind amount turn upwind heading made Gradually increase bank angle airplane comes around downwind Try it works Next month Ill present some wind effects vertical maneuvers last few weeks have testing new product called PoweR/Charge SP Systems Marietta Ga combined nickel-cadmium battery discharger-charger field tester havent made com prehensive test unit seems advertised have used batteries two radio systems old questionable airborne pack cases PoweR/Charge progressively increased discharge time indicating increased capacity Especially striking capacity increase old battery pack After initial charge old 475-ma pack should have discharged least 2 hours 10 minutes first discharge lasted 1 hour 40 minutes second dis charge 2 hours 4 minutes third dis charge lasted 2 hours 20 minutes Subsequent discharges pack hovered around 2 hours 30 minutes Similar less startling capacity increases occurred other battery packs tested future com prehensive review will published Have seen new book beginners called Basics Radio Control Modeling Fred Marks co-authors book Model Aviation editor Bill Winter Fred town couple weeks ago business pre sented copy review remarkably well done piece work book includes chapters tools materials radio equipment engines airplanes boats cars other models like way its written photography has quality often seen model publications address 12 Connie Dr Shalimar Fla 32579 FF Duration/Meuser continued page 43 can purchased $695 can buy individual parts unit accommodates Forster 29 O&R 23 K&B Torpedo primarily flying parts nicely polished unit makes attractive display too Weight 294 gramsa thin hair over ounceand overall length 2 info write Jim 1442 N Fruit Ave Fresno CA 93728 Call Papers National Free Flight Society soliciting papers 1976 NFFS Symposium held 1976 Nats Papers will published 1976 Symposium vol ume whether author able present paper personally Nats Papers should cover some aspect science art free-flight models including technical studies practical design engineering applied models new unusual model aircraft developments historical items Both indoor outdoor freeflight modeling developments included Please send proposed papers Ray Harlan 15 Happy Hollow Rd Wayland Mass 01778 Send title proposed paper together abstract 200 words or complete paper available considered ab stracts should submitted Feb 15 1976 Book Review A ero -Modeller Annual 1975-76 review general model aviation book free-flight column Well well skip RC CL stuff judge solely its free-flight content sign times perhaps first Annual Ive seen paperback price has doubled two years UK price trans lates $450 what actual USA price will remains seen Compared what get money buy say $600 worth magazines imagine will judge worth money drawings A P Lloyd usual top quality Most model plans have appeared other publications would have subscribe magazine news letter world have seen before plans count includes 17 FAI-class models smattering others Most articles original about dozen directly related free flight including series three finishing overview Pennyplane activity world-wide plenty plans Dave Lin strum photo-story covering dozen unusual engines such Elf flat-six rotary valve four-stroke Dooling turned 28000 rpm cover other John Daddy Warbucks Pond himself complete Old-Timer course SAM 01 license plate address 4200 Gregory St Oakland Calif 94619 66 Model Aviation