HELICOPTERS Dave Chesney THANKS Ken Kiel others have helped bail Out past few months time flying model Helicopters has replaced time flying via Delta Airlines rented Grumman AA5B company work has added few new branches time home has premium must apologize being responsive letters Ive received over past few months again business travel will have excuse Im recovering slowly time read column letters will have answered letter Larry Axelson leads subject intended cover next noticed shortened control rotor Ken Kiels Heliboy picture last months column mod developed Larry primarily make machine easier transport original longer flybar got way Larry pleased results flying machine flybarless letter notes should sufficient equally success ful modification Heliboy Larrys letter notes follow Dear Dave Thought might interested modificaiton short flybar Heliboy Im sending little write-up along some pictures welcome use form see fit column think other pilots would interested reason pictures cannot used call drop line Ill get some can used read column month find very interesting helpful Keep up good work Sincerely Larry M Axelson Rt 5 Box 364 Sparta WI 54656 608 269-2232 following Larrys notes Heliboy pilots have always wanted shorter flybar afraid try may what have looking forbut have advanced point using mixing arms responsive lead cutting flybar eight inches rethreading cut end standard 10-32 die will have completed hardest part moditication Now necessary reverse mixing arms see photos rotor head pushrods swash plate connect short side mixer pushrods flybar long side mixer test-hovered Heliboy before revers ing mixer linkage found response slow mushy shortened flybar reversal mixer linkage brought back needed responsiveness collective throw desired Reversal linkage reduces collective range DR C simply relocate ball long side equally spaced pivot center ball short side brass ball bolt used tail rotor ball link system works just fine purpose Up point knew short flybar setup worked well hover real test forward flight test called Ken Kiel test pilot Ken president Sparta Area Model Club very good friend have highest degree confidence respect ability fly Ken hovered little get feel machine get trims set lifted off made pass down field pleased Heliboy responded expected also pleased very much see glide hover settle ground smoothly Ken insisted skill flying setup very little successful test Could possible rate Ken now flies modification Heliboy mu uumuwurun uuurpnutuat rigni o uutuiat L1IyMAUISUl esuuasimy paintboththetrucuanu Lriuurloppurarsrsuanomnv roust uIauunaru U flowered contact paperf Photo left shows flls well although Ken Kiel claims own piloting skill Larrys rotu ,ad modification key Heliboy update Ken has modified own Heliboy using Larrys methodhmmm Other photos plus months column tell much about mechanical change 1 Closeup views LarryAxelsons modified Heliboy rotor systemcomplete description column bettU rotor blades too Look machine screws holding things togetheryoud better use Loctite safety 32 Model Aviation Bruce Buchannan Winona MN 1978 Nats Novice Champ 1979 Nats Third Place Intermediate also flies short flybar modifica tion Ken Bruce have noticed adverse effects modification objec tive project use very short flybar yet maintain original stability re sponsiveness standard objective believe has reached s Larry Axelson Well have Larry cut standard 19-in flybar 11 inches yet still maintained responsive rotor system mentioned briefly October column popular RC Helicopters use flybar servo rotor rotor systems Some like Helibaby Revolution 40 early Schlueter machines Du-Bros Hughes 300 Shark others use Hiller setup servo rotor alone responsible transmitting cyclic control main rotor blades fixed-collective-pitch Hiller rotor system beautifully simple offers beginner very stable rotor system fact system might well have too stable Some might remember modifications increase respon siveness rotor system Drilling holes paddles lighten method course cans rate once beginner could hover comfortably next step get Helicopter respond new flying skills response time following rate Hiller-type rotor see October MA determined servo rotor Now noted above advanced fliers would want faster following rate FR beginners may wish Helicopters FR reduced general RC Helicopters designed FR well within capabilities beginning pilot adjust ments can made mentioned above weight paddles will influence FR will paddle area Larry found length flybar rotor speed will also affect FR mentioned several columns back more-or-less constant rotor rpm variable-collective rotor advantageous since fixed collective rotors require increases decreases rotor sneed vzrv lift As sneed rotor reduced FR Consequently comfortable FR during hover forward flight might well too slow during descent translation forward flight fixedcollective Helicopter Before moving believe beginners chopper flying particularly have flown RC airplanes will comfortable flying Helicopter quick re Con unued page 110 GRUMMAN WIDGEON MR Gs PRODUCTS 1100 Michigan Box 161 Marvsvillv XII 4804 RUFIER POWEi~ pEAMU~ NEW 47 sq inch WillS LACE V rn-i 13 PE4NUT KIT $495 II PEANUT KITS $495 EACH LACEv M15COUGARMUSTANG PIETENPOLGIPSY MOTHZERO PIPER CUBGANAGOBIEMILES MIS ANDRESONDRUINE COAIPIETi CAT4t0C $100 HARD TO FIND ACCESSORIES KITS AND PLANS FOR RUBBER POWERED MODELS P 0 BOX 2498MA DA&h.DhIuJmaJic LA MESA CALIF 92041 ii PHONE 714 4898075 714 4424838 February 1981 33 W R Hartness checks outthe coolerside flying Sanford NC Pattern fliers can eattheir hearts out Nobody said sunny South warm too Ultimate Flying Boat Tb e SCALE WHE RADIO CONTROL ROL-UNE 0 _ 0 0 VINTAGESMOOTHGOLDEN AGENEW sizes2YzCONTOURsizes21/iBALLOON 343/"23/43431/a 1334134132/z41/2 11443/i11/4311/443/i34514 11/251/24/z1hz53 1ls6/21451/41s61/2 ELS FREE-FLIGHT SCALE PILOTS CYUNDERS ENGINE KITS MACHINE GUN KITS PLASTIC DISPLAY MODELS EROS INTh SEND $1 FOR COMPLETE ILLUSTRATED CATALOG ___________________ DEPT MA PAWNEE ST SAN MARCOS CA 9 INTRODUCING Tile American RJL K6I R/C ENGINE RJL Industries now produces renowned engine formerly manufactured Kraft Systems Inc schnuerle ported 61 cubic inch engine provides easy starting high performance longevity Produced finest materials workmanship quality assurance youll proud have aircraft powered K61 FEATURES INCLUDE Schnuerle Ports Boost Port Double Ball Bearings Forged Alloy Piston & Con Rod Bushed Connecting Rod 0- ring Sealed Back Cover 16 HP 15500 RPM SUGGESTED RETAIL $13995 Muffler Included Send Free Catalog Today R J L INDUSTRIES P0 Box 5654 Pasadena CA 91107 1831 Business Center Dr Duarte CA 91010 allows oil soaking begins invite warps Incidentally have just learned R 1 Mikkelson producing nitrate dope red yellow blue orange black white distil bution Old Timer Models PO Box 913 Westminster CA 92683 last word Dont stink up house just before company comes may understand reference dope Clarence Haught Rt 5 Box 16 CouerdAlene ID 83814 i 213/359-0016 RC Helicopters/Chesney Continued page 33 sponses As someone told few years back might get trouble faster can get out trouble faster too course Heli copter will respond differently pilots capabilities will vary best rule may well fly way comes out box Thought might enjoy knowing few times snows down South photos shows mere snow cant stop dedi cated chopper pilot like W R Hartness Sanford NC Also special tip winter fliers Lloyd Wheelerwatch out rotor blade icingSee next month Dave Chesney 9 Box 621A Greensboro NC 27409 RC Soaring/Pruss Continued page 31 place fastest time around 76-kilometer 472-mi Great Race course race Pat Flinn Greater Detroit Soaring Hiking Society won last year flight 304 miles November MA challenge open AMA chartered clubs further formation may obtained sending stamped self-addressed business envelope address below Good Lift Dan Pruss RR 2 Box 49D Plainfield IL 60544 RC Scale/Wischers Continued page 35 Early morning wind light Brian Allen flew Gossamer Albatross misfortune Wittman Airport day pleasure introduction also met Brians parents source modesty equanimity became apparent Scale race-plane buffs fullsize reproductions Gee Bee Z Travelair Mystery Ship Laird Super Solution along Jimmy Doolittle flew original Laird Bendix Thompson Trophy races Two weeks after convention again Wittman field attended three days World Aerobatic Championships Forty-two men nine women 10 countries included competition about 20 planes use several pilots taking turns flying some planes Pitts 5-1 S-2s common US designs along Christen Eagle Leo Loudenslagers winning Laser 200 German team used Zlin SOL France three CAP 20s CAP 21 ASA 200 CAP 20 fuselage tapered wing place usual semi-elliptical planform aerobatic types ideal Scale projects some already available kit form CAP 20 featured construction article March 1980 issue Model Aviation United States swept first three places both mens womens divisions reader trend toward 1/5-scale practical alternative Giant Scale seems gaining foothold thought letter Louie Scribner contained material general interest Nats chance visit Springfield MAC field Donnelsville OH watched several fellows flying new Old-Timers seven-foot-span range powered 05 60 4-cycle engines impressed quiet engines low rpms floating ability planes occurred build Sport Scale might build Piper 1-3 along same lines would fly slowly smoothly calm air using same 05 60 engine might add Im interested belt drives chain-saw engines Giant Scale Ive already built Sig J-3 turned out rather nicely Im considering scaling Sig plans up 117 times 1/6-scale handle 05 60 engine seems have about power good 40 14-6 7500 rpm Obviously -scale too much 1/5-scale might right would produce following numbers Span 845-in chord 12-in wing thickness 1-5/16-in overall length 52-in area Continued page 112 110 Model Aviation 0 SAFE FLYING IS NO ACCIDENT
Edition: Model Aviation - 1981/02
Page Numbers: 32, 33, 110
HELICOPTERS Dave Chesney THANKS Ken Kiel others have helped bail Out past few months time flying model Helicopters has replaced time flying via Delta Airlines rented Grumman AA5B company work has added few new branches time home has premium must apologize being responsive letters Ive received over past few months again business travel will have excuse Im recovering slowly time read column letters will have answered letter Larry Axelson leads subject intended cover next noticed shortened control rotor Ken Kiels Heliboy picture last months column mod developed Larry primarily make machine easier transport original longer flybar got way Larry pleased results flying machine flybarless letter notes should sufficient equally success ful modification Heliboy Larrys letter notes follow Dear Dave Thought might interested modificaiton short flybar Heliboy Im sending little write-up along some pictures welcome use form see fit column think other pilots would interested reason pictures cannot used call drop line Ill get some can used read column month find very interesting helpful Keep up good work Sincerely Larry M Axelson Rt 5 Box 364 Sparta WI 54656 608 269-2232 following Larrys notes Heliboy pilots have always wanted shorter flybar afraid try may what have looking forbut have advanced point using mixing arms responsive lead cutting flybar eight inches rethreading cut end standard 10-32 die will have completed hardest part moditication Now necessary reverse mixing arms see photos rotor head pushrods swash plate connect short side mixer pushrods flybar long side mixer test-hovered Heliboy before revers ing mixer linkage found response slow mushy shortened flybar reversal mixer linkage brought back needed responsiveness collective throw desired Reversal linkage reduces collective range DR C simply relocate ball long side equally spaced pivot center ball short side brass ball bolt used tail rotor ball link system works just fine purpose Up point knew short flybar setup worked well hover real test forward flight test called Ken Kiel test pilot Ken president Sparta Area Model Club very good friend have highest degree confidence respect ability fly Ken hovered little get feel machine get trims set lifted off made pass down field pleased Heliboy responded expected also pleased very much see glide hover settle ground smoothly Ken insisted skill flying setup very little successful test Could possible rate Ken now flies modification Heliboy mu uumuwurun uuurpnutuat rigni o uutuiat L1IyMAUISUl esuuasimy paintboththetrucuanu Lriuurloppurarsrsuanomnv roust uIauunaru U flowered contact paperf Photo left shows flls well although Ken Kiel claims own piloting skill Larrys rotu ,ad modification key Heliboy update Ken has modified own Heliboy using Larrys methodhmmm Other photos plus months column tell much about mechanical change 1 Closeup views LarryAxelsons modified Heliboy rotor systemcomplete description column bettU rotor blades too Look machine screws holding things togetheryoud better use Loctite safety 32 Model Aviation Bruce Buchannan Winona MN 1978 Nats Novice Champ 1979 Nats Third Place Intermediate also flies short flybar modifica tion Ken Bruce have noticed adverse effects modification objec tive project use very short flybar yet maintain original stability re sponsiveness standard objective believe has reached s Larry Axelson Well have Larry cut standard 19-in flybar 11 inches yet still maintained responsive rotor system mentioned briefly October column popular RC Helicopters use flybar servo rotor rotor systems Some like Helibaby Revolution 40 early Schlueter machines Du-Bros Hughes 300 Shark others use Hiller setup servo rotor alone responsible transmitting cyclic control main rotor blades fixed-collective-pitch Hiller rotor system beautifully simple offers beginner very stable rotor system fact system might well have too stable Some might remember modifications increase respon siveness rotor system Drilling holes paddles lighten method course cans rate once beginner could hover comfortably next step get Helicopter respond new flying skills response time following rate Hiller-type rotor see October MA determined servo rotor Now noted above advanced fliers would want faster following rate FR beginners may wish Helicopters FR reduced general RC Helicopters designed FR well within capabilities beginning pilot adjust ments can made mentioned above weight paddles will influence FR will paddle area Larry found length flybar rotor speed will also affect FR mentioned several columns back more-or-less constant rotor rpm variable-collective rotor advantageous since fixed collective rotors require increases decreases rotor sneed vzrv lift As sneed rotor reduced FR Consequently comfortable FR during hover forward flight might well too slow during descent translation forward flight fixedcollective Helicopter Before moving believe beginners chopper flying particularly have flown RC airplanes will comfortable flying Helicopter quick re Con unued page 110 GRUMMAN WIDGEON MR Gs PRODUCTS 1100 Michigan Box 161 Marvsvillv XII 4804 RUFIER POWEi~ pEAMU~ NEW 47 sq inch WillS LACE V rn-i 13 PE4NUT KIT $495 II PEANUT KITS $495 EACH LACEv M15COUGARMUSTANG PIETENPOLGIPSY MOTHZERO PIPER CUBGANAGOBIEMILES MIS ANDRESONDRUINE COAIPIETi CAT4t0C $100 HARD TO FIND ACCESSORIES KITS AND PLANS FOR RUBBER POWERED MODELS P 0 BOX 2498MA DA&h.DhIuJmaJic LA MESA CALIF 92041 ii PHONE 714 4898075 714 4424838 February 1981 33 W R Hartness checks outthe coolerside flying Sanford NC Pattern fliers can eattheir hearts out Nobody said sunny South warm too Ultimate Flying Boat Tb e SCALE WHE RADIO CONTROL ROL-UNE 0 _ 0 0 VINTAGESMOOTHGOLDEN AGENEW sizes2YzCONTOURsizes21/iBALLOON 343/"23/43431/a 1334134132/z41/2 11443/i11/4311/443/i34514 11/251/24/z1hz53 1ls6/21451/41s61/2 ELS FREE-FLIGHT SCALE PILOTS CYUNDERS ENGINE KITS MACHINE GUN KITS PLASTIC DISPLAY MODELS EROS INTh SEND $1 FOR COMPLETE ILLUSTRATED CATALOG ___________________ DEPT MA PAWNEE ST SAN MARCOS CA 9 INTRODUCING Tile American RJL K6I R/C ENGINE RJL Industries now produces renowned engine formerly manufactured Kraft Systems Inc schnuerle ported 61 cubic inch engine provides easy starting high performance longevity Produced finest materials workmanship quality assurance youll proud have aircraft powered K61 FEATURES INCLUDE Schnuerle Ports Boost Port Double Ball Bearings Forged Alloy Piston & Con Rod Bushed Connecting Rod 0- ring Sealed Back Cover 16 HP 15500 RPM SUGGESTED RETAIL $13995 Muffler Included Send Free Catalog Today R J L INDUSTRIES P0 Box 5654 Pasadena CA 91107 1831 Business Center Dr Duarte CA 91010 allows oil soaking begins invite warps Incidentally have just learned R 1 Mikkelson producing nitrate dope red yellow blue orange black white distil bution Old Timer Models PO Box 913 Westminster CA 92683 last word Dont stink up house just before company comes may understand reference dope Clarence Haught Rt 5 Box 16 CouerdAlene ID 83814 i 213/359-0016 RC Helicopters/Chesney Continued page 33 sponses As someone told few years back might get trouble faster can get out trouble faster too course Heli copter will respond differently pilots capabilities will vary best rule may well fly way comes out box Thought might enjoy knowing few times snows down South photos shows mere snow cant stop dedi cated chopper pilot like W R Hartness Sanford NC Also special tip winter fliers Lloyd Wheelerwatch out rotor blade icingSee next month Dave Chesney 9 Box 621A Greensboro NC 27409 RC Soaring/Pruss Continued page 31 place fastest time around 76-kilometer 472-mi Great Race course race Pat Flinn Greater Detroit Soaring Hiking Society won last year flight 304 miles November MA challenge open AMA chartered clubs further formation may obtained sending stamped self-addressed business envelope address below Good Lift Dan Pruss RR 2 Box 49D Plainfield IL 60544 RC Scale/Wischers Continued page 35 Early morning wind light Brian Allen flew Gossamer Albatross misfortune Wittman Airport day pleasure introduction also met Brians parents source modesty equanimity became apparent Scale race-plane buffs fullsize reproductions Gee Bee Z Travelair Mystery Ship Laird Super Solution along Jimmy Doolittle flew original Laird Bendix Thompson Trophy races Two weeks after convention again Wittman field attended three days World Aerobatic Championships Forty-two men nine women 10 countries included competition about 20 planes use several pilots taking turns flying some planes Pitts 5-1 S-2s common US designs along Christen Eagle Leo Loudenslagers winning Laser 200 German team used Zlin SOL France three CAP 20s CAP 21 ASA 200 CAP 20 fuselage tapered wing place usual semi-elliptical planform aerobatic types ideal Scale projects some already available kit form CAP 20 featured construction article March 1980 issue Model Aviation United States swept first three places both mens womens divisions reader trend toward 1/5-scale practical alternative Giant Scale seems gaining foothold thought letter Louie Scribner contained material general interest Nats chance visit Springfield MAC field Donnelsville OH watched several fellows flying new Old-Timers seven-foot-span range powered 05 60 4-cycle engines impressed quiet engines low rpms floating ability planes occurred build Sport Scale might build Piper 1-3 along same lines would fly slowly smoothly calm air using same 05 60 engine might add Im interested belt drives chain-saw engines Giant Scale Ive already built Sig J-3 turned out rather nicely Im considering scaling Sig plans up 117 times 1/6-scale handle 05 60 engine seems have about power good 40 14-6 7500 rpm Obviously -scale too much 1/5-scale might right would produce following numbers Span 845-in chord 12-in wing thickness 1-5/16-in overall length 52-in area Continued page 112 110 Model Aviation 0 SAFE FLYING IS NO ACCIDENT
Edition: Model Aviation - 1981/02
Page Numbers: 32, 33, 110
HELICOPTERS Dave Chesney THANKS Ken Kiel others have helped bail Out past few months time flying model Helicopters has replaced time flying via Delta Airlines rented Grumman AA5B company work has added few new branches time home has premium must apologize being responsive letters Ive received over past few months again business travel will have excuse Im recovering slowly time read column letters will have answered letter Larry Axelson leads subject intended cover next noticed shortened control rotor Ken Kiels Heliboy picture last months column mod developed Larry primarily make machine easier transport original longer flybar got way Larry pleased results flying machine flybarless letter notes should sufficient equally success ful modification Heliboy Larrys letter notes follow Dear Dave Thought might interested modificaiton short flybar Heliboy Im sending little write-up along some pictures welcome use form see fit column think other pilots would interested reason pictures cannot used call drop line Ill get some can used read column month find very interesting helpful Keep up good work Sincerely Larry M Axelson Rt 5 Box 364 Sparta WI 54656 608 269-2232 following Larrys notes Heliboy pilots have always wanted shorter flybar afraid try may what have looking forbut have advanced point using mixing arms responsive lead cutting flybar eight inches rethreading cut end standard 10-32 die will have completed hardest part moditication Now necessary reverse mixing arms see photos rotor head pushrods swash plate connect short side mixer pushrods flybar long side mixer test-hovered Heliboy before revers ing mixer linkage found response slow mushy shortened flybar reversal mixer linkage brought back needed responsiveness collective throw desired Reversal linkage reduces collective range DR C simply relocate ball long side equally spaced pivot center ball short side brass ball bolt used tail rotor ball link system works just fine purpose Up point knew short flybar setup worked well hover real test forward flight test called Ken Kiel test pilot Ken president Sparta Area Model Club very good friend have highest degree confidence respect ability fly Ken hovered little get feel machine get trims set lifted off made pass down field pleased Heliboy responded expected also pleased very much see glide hover settle ground smoothly Ken insisted skill flying setup very little successful test Could possible rate Ken now flies modification Heliboy mu uumuwurun uuurpnutuat rigni o uutuiat L1IyMAUISUl esuuasimy paintboththetrucuanu Lriuurloppurarsrsuanomnv roust uIauunaru U flowered contact paperf Photo left shows flls well although Ken Kiel claims own piloting skill Larrys rotu ,ad modification key Heliboy update Ken has modified own Heliboy using Larrys methodhmmm Other photos plus months column tell much about mechanical change 1 Closeup views LarryAxelsons modified Heliboy rotor systemcomplete description column bettU rotor blades too Look machine screws holding things togetheryoud better use Loctite safety 32 Model Aviation Bruce Buchannan Winona MN 1978 Nats Novice Champ 1979 Nats Third Place Intermediate also flies short flybar modifica tion Ken Bruce have noticed adverse effects modification objec tive project use very short flybar yet maintain original stability re sponsiveness standard objective believe has reached s Larry Axelson Well have Larry cut standard 19-in flybar 11 inches yet still maintained responsive rotor system mentioned briefly October column popular RC Helicopters use flybar servo rotor rotor systems Some like Helibaby Revolution 40 early Schlueter machines Du-Bros Hughes 300 Shark others use Hiller setup servo rotor alone responsible transmitting cyclic control main rotor blades fixed-collective-pitch Hiller rotor system beautifully simple offers beginner very stable rotor system fact system might well have too stable Some might remember modifications increase respon siveness rotor system Drilling holes paddles lighten method course cans rate once beginner could hover comfortably next step get Helicopter respond new flying skills response time following rate Hiller-type rotor see October MA determined servo rotor Now noted above advanced fliers would want faster following rate FR beginners may wish Helicopters FR reduced general RC Helicopters designed FR well within capabilities beginning pilot adjust ments can made mentioned above weight paddles will influence FR will paddle area Larry found length flybar rotor speed will also affect FR mentioned several columns back more-or-less constant rotor rpm variable-collective rotor advantageous since fixed collective rotors require increases decreases rotor sneed vzrv lift As sneed rotor reduced FR Consequently comfortable FR during hover forward flight might well too slow during descent translation forward flight fixedcollective Helicopter Before moving believe beginners chopper flying particularly have flown RC airplanes will comfortable flying Helicopter quick re Con unued page 110 GRUMMAN WIDGEON MR Gs PRODUCTS 1100 Michigan Box 161 Marvsvillv XII 4804 RUFIER POWEi~ pEAMU~ NEW 47 sq inch WillS LACE V rn-i 13 PE4NUT KIT $495 II PEANUT KITS $495 EACH LACEv M15COUGARMUSTANG PIETENPOLGIPSY MOTHZERO PIPER CUBGANAGOBIEMILES MIS ANDRESONDRUINE COAIPIETi CAT4t0C $100 HARD TO FIND ACCESSORIES KITS AND PLANS FOR RUBBER POWERED MODELS P 0 BOX 2498MA DA&h.DhIuJmaJic LA MESA CALIF 92041 ii PHONE 714 4898075 714 4424838 February 1981 33 W R Hartness checks outthe coolerside flying Sanford NC Pattern fliers can eattheir hearts out Nobody said sunny South warm too Ultimate Flying Boat Tb e SCALE WHE RADIO CONTROL ROL-UNE 0 _ 0 0 VINTAGESMOOTHGOLDEN AGENEW sizes2YzCONTOURsizes21/iBALLOON 343/"23/43431/a 1334134132/z41/2 11443/i11/4311/443/i34514 11/251/24/z1hz53 1ls6/21451/41s61/2 ELS FREE-FLIGHT SCALE PILOTS CYUNDERS ENGINE KITS MACHINE GUN KITS PLASTIC DISPLAY MODELS EROS INTh SEND $1 FOR COMPLETE ILLUSTRATED CATALOG ___________________ DEPT MA PAWNEE ST SAN MARCOS CA 9 INTRODUCING Tile American RJL K6I R/C ENGINE RJL Industries now produces renowned engine formerly manufactured Kraft Systems Inc schnuerle ported 61 cubic inch engine provides easy starting high performance longevity Produced finest materials workmanship quality assurance youll proud have aircraft powered K61 FEATURES INCLUDE Schnuerle Ports Boost Port Double Ball Bearings Forged Alloy Piston & Con Rod Bushed Connecting Rod 0- ring Sealed Back Cover 16 HP 15500 RPM SUGGESTED RETAIL $13995 Muffler Included Send Free Catalog Today R J L INDUSTRIES P0 Box 5654 Pasadena CA 91107 1831 Business Center Dr Duarte CA 91010 allows oil soaking begins invite warps Incidentally have just learned R 1 Mikkelson producing nitrate dope red yellow blue orange black white distil bution Old Timer Models PO Box 913 Westminster CA 92683 last word Dont stink up house just before company comes may understand reference dope Clarence Haught Rt 5 Box 16 CouerdAlene ID 83814 i 213/359-0016 RC Helicopters/Chesney Continued page 33 sponses As someone told few years back might get trouble faster can get out trouble faster too course Heli copter will respond differently pilots capabilities will vary best rule may well fly way comes out box Thought might enjoy knowing few times snows down South photos shows mere snow cant stop dedi cated chopper pilot like W R Hartness Sanford NC Also special tip winter fliers Lloyd Wheelerwatch out rotor blade icingSee next month Dave Chesney 9 Box 621A Greensboro NC 27409 RC Soaring/Pruss Continued page 31 place fastest time around 76-kilometer 472-mi Great Race course race Pat Flinn Greater Detroit Soaring Hiking Society won last year flight 304 miles November MA challenge open AMA chartered clubs further formation may obtained sending stamped self-addressed business envelope address below Good Lift Dan Pruss RR 2 Box 49D Plainfield IL 60544 RC Scale/Wischers Continued page 35 Early morning wind light Brian Allen flew Gossamer Albatross misfortune Wittman Airport day pleasure introduction also met Brians parents source modesty equanimity became apparent Scale race-plane buffs fullsize reproductions Gee Bee Z Travelair Mystery Ship Laird Super Solution along Jimmy Doolittle flew original Laird Bendix Thompson Trophy races Two weeks after convention again Wittman field attended three days World Aerobatic Championships Forty-two men nine women 10 countries included competition about 20 planes use several pilots taking turns flying some planes Pitts 5-1 S-2s common US designs along Christen Eagle Leo Loudenslagers winning Laser 200 German team used Zlin SOL France three CAP 20s CAP 21 ASA 200 CAP 20 fuselage tapered wing place usual semi-elliptical planform aerobatic types ideal Scale projects some already available kit form CAP 20 featured construction article March 1980 issue Model Aviation United States swept first three places both mens womens divisions reader trend toward 1/5-scale practical alternative Giant Scale seems gaining foothold thought letter Louie Scribner contained material general interest Nats chance visit Springfield MAC field Donnelsville OH watched several fellows flying new Old-Timers seven-foot-span range powered 05 60 4-cycle engines impressed quiet engines low rpms floating ability planes occurred build Sport Scale might build Piper 1-3 along same lines would fly slowly smoothly calm air using same 05 60 engine might add Im interested belt drives chain-saw engines Giant Scale Ive already built Sig J-3 turned out rather nicely Im considering scaling Sig plans up 117 times 1/6-scale handle 05 60 engine seems have about power good 40 14-6 7500 rpm Obviously -scale too much 1/5-scale might right would produce following numbers Span 845-in chord 12-in wing thickness 1-5/16-in overall length 52-in area Continued page 112 110 Model Aviation 0 SAFE FLYING IS NO ACCIDENT