___John Preston___________________________ Safety Comes First weighted blades RC Heli copters safety hints propel lers legal RC frequencies prob lem surfaces again eliminating flutter buzz CORRECTION I recently received let ter Glenn Scillian concerning report accident flying RC Helicopter reported column January 1986 issue Model Aviation seems report accident completely wrong may disservice RC Helicopter builders fliers previous report stated Glenn struck leg unweighted rotor blade thrown off models Glenn states let ter struck one-ounce lead weight come loose rotor blades letter Glenn enclosed copy letter wrote November 1984 Larry Jolly described accident dont believe Larry ever reported incident RC Helicopters column set record straight Im going use Glenns own words describe what really happened also apologize wrong account January issue summer 1983 suffered serious accident struck lead weight blade Heli copter found added ounce lead shape disk about inch diameter about A-inch thick blade model flew beau tifullymuch better unweight ed blades As far can recall blades never touched ground tall boom slugs epoxied cavity about three inches outside end blade cavity half hardwood half balsa grant long slender slug nesting en tirely hardwood would have safer disk shape recommended manufacturer use its Helicopters day revving engine up Helicopter sitting OR 004 ON Li Reader David Lewis suggests Iactoryappiied stickers RC transmitters system boxes such could help salespersons hobby shops sell legal radios novice RC hobbyists Preston discusses problem column ground about 12 feet front tail toward Just moment lift-off slug chunk wood blade let go struck right shin two inches below kneecap knocked down still held transmitter shut throttle down now-unbalanced copter thrashed violently ground literally tore off tail boom friend finally stopped blades pulled off fuel line Other friends applied some clean towels wound bleeding moderately drain ing bone-marrow oil driven nearest hospital about five miles away treated outpatient Exami Continued page 16 t II I5 ITS O5VIOLALY FRLAENCY AIkCY-AET cLY 14 Model Aviation UNIVERSAL IN-COWL AIRCRAFT MUFFLERS 19-4045-6075-13 engines UPSIONT ox INVICIED ENOINE Jt-40119-401600 JI-OGi45-901700 11-90175-131900 TTLAS0577 0T0530le0705e0 DUN tSmee 0e5 soc OATS 757 bA 7550 77 5577 504 Most versatile mufflers ever offered Designed fit inside cowls lImited soace can also used HELICOPTERS BOATS 0 For UPRIGHT INVERTED SIDE mounted engines 0 Exhaust tubes point almost direction S Worm drive clamp universal mounting can bolted directly engine BASIC DIMENSIONS INCLUDES Exhaust pipe extensions clamps553003737003007370700 worm drive clomp muffler alignment 0i plate gasket mounting screws S nOt 3073~IC 9031 hObby shop ORDER DIRECT tar rxnedote s9ment Check MO Visa MC COD accepted Add S260 tar UPS S200 tar COD 6% IcieR tax tar Cdt resident RETRACTABLE OW HOOK RELEASE Price SS90 Simplest reliable device available After line released hook retracts body unit leaving SMOOTH surface bottom aircraft No special attachments required N eight Y5 oz OTHER FOURMOST PRODUCTS 03C [5 ZAO[SW[TZ[5-] a S 164 School St Daly CIty CA 94014 415 756-3400 049/051 AIRFLO ENGINE MOUNT REDUCES DRAG VIBRATION FREE PRICE $300 40 AIRFLO ENGINE MOUNT IDEAL FOR QUICKY 500 PRICE $630 Fuel Fitting Sets Fuel Shut Off Fuel Manifold Gapless Hinges Gapless Hinge Slotter Strut Fairings Cockpit Coaming nation showed chipped tibia fortu nately no damage patella ligament wear soft cast about three weeks healing complete four five weeks Before returned flying weighted blades dis carded replaced Jeff Urcan s heavy blades As far can see fly well lead-weighted blades Glenns letter described another inci dent friend hovering Helicopter about eye level lead weight blades let go case nobody struck flying weight damage Helicopter due its unbalanced main rotor blades Before leaving subject let re mind readers emergency competi tion rule published September 1984 issue Model Aviation out lawed metal blades knife-edged leading edges blades metal blades beyond point two inches blade root attachment point emer gency rule enacted under AMA con test board procedures permit AMA president concurrence appropriate Contest Board chairman take emergency action dictated situation However make such emergency rules change permanent must ratified vote entire Contest Board must take place tween four six weeks after publication emergency rules change mem bers Helicopter Contest Board voted against rule concerning Helicopter blades So weighted blades still permitted AMA-sanctioned Helicopter contests Note however FAI rules RC Helicopters page 106 1986-87 rule book per mit metal blades metal weights blades knife-like leading edges blades PropellersIt seems appropriate switch potential hazard Heli copter blades presented blades propellers fixed-wing models Two readers contacted during last month phone letter subject blade separation propellers phone call Paul Geders St Louis MO inquire whether particular type non-wood prop involved significantly blade-shedding incidents other types Apparently fellow club members wanted outlaw use prop based incident damaged blade let go combed cor respondence records concerning prop cidents didnt really find enough documented incidents make statis tically-valid conclusions However found interesting appeared incidents blades separating wooden props plastic props Please regard statement Continued page 18 16 Model Aviation UPWCCTIIDVINVfITRORORSRROSIOI lee 434057770073 5311 CATAIfl Winning Ideas FOURMOST nd SASE Complete Information Ave Forest Grove OR 97116 PRODUCTS Phone 503 357-2732 4 vOl ec &cP C Al A0S oBB~ sendOR -cl meaning plastic props safer wood props Id rather aware blades may separate prop no matter what material fabricated letter concerning props came AE Richt Scott Depot WV en closed instructions received some Graupner Super fiberglassreinforced nylon props purchased major mail order hobby retailer instructions entirely German appeared contain some warning statements would-be users AE stated German far goodbut apparently better since able decipher care should taken ensure props dry-out Periodic boiling storing wet rag appeared recommended second warning appeared state prop tip velocity should ex ceed 180 meters/second AE supplied following table listing maximum rpm various prop diameters will exceed 180 in/sec tip speed Prop DI S 6 7 8 9 9 l0 lOS II 12 125 13 14 15 Max RPM 27000 22500 19300 16900 15000 14200 13500 12800 12300 11200 10800 10400 9600 9000 have sent Graupner prop instruc tions German-born engineer friend request translation thing else importance pops up translation Ill include next Safe ty column Meanwhile time gets print should have translated instructions will forward reader sending SASE address end column Which frequency model let ter arrived just day too late included last months Safety column contained very simple remedy mix-up can occur hobby store owner either knowingly unknowingly sells radio aircraft-only fre quency customer plans use boat car think major hobby retailers aware fact aircraft-only boat/car-only RC frequencies However follow ing letter David Lewis points out may some sources radios sales personnel aware fact have Navy last five years am now serving aboard Continued page 20 18 Model Aviation Spec al Detergents help prevent yarn sh p omo e c ean burning Rust Preventatives protect expens ye eng nes f om corrosion SIG CHAMPION 2 STROKE FUEL FREIGHT FREE sHIPPING ON ORDERS OVER $1500COLLECT PINTQUARTGALLON55 GAL DRUM 0N omethane$315$450$1050 00 5Ntromethane$365$525$1250 00 10%Ntrornethane$415$550$1450 00 15%Nitromethane$430$625$1650 00 25%Nitrornethane$495$750$2095 00 35%Ntromethane$575$875$2495 00 SIGPREMIUM4-STROKE FUEL 10%Nltromethane$415$550$1395 00 15%Nitrornethane$425$625$1595 00 THE CHOICE OF CHAMPION FLYERS Fr ars 510 has blending fuel finest qual ty ingrec e arie alcuha 99 - ery best grade available nitromethaxe use 1i ira get hunest r volume tar maximum lubrication get eb[end ot Bakers AA Cara K sty Tecvniplate Racing Oil protect expensive erg rs r try tivest qual ty t xl tva -av re avy price Dant tube wurd tor try vome cry ciurse[ti See dealer first available order direct Call 247-5008 toll free orders Latest Catalog $300 ~- SIG MANUFACTURING CO Montezuma IA 50171 xervnvire DYNATHRUST PROPS look great too! ALL FUTURE PRODUCTION ON ALL SIZES WILL HAVE LOGO AND TIPS PAINTED SIZES CURRENTLY AVAILABLE 13x6 15x6 8 $700 18x6 810 $1000 22x8 10- $1800 14x6 16x6 8 20x6 810 0 AddlSlzesAvailable Soon 2541 NE 11th Court ano Beach Florida 33062 e 13051 941-9119 AVAILABLE FROM LEADING DEALERS AND DISTRUBUTORS DIRECT CYANOACRYLATE CIAL INTROOUCTORY OFFER ListSaleSavings 1 oz Fast Cure 3-5 Sec$2500/0 Off 2 oz Fast Cure 3-5 Sec895$39656% Off 1 oz Gap-Filling 5 Sec495$2450% Off 2 oz Gap-Filling 5 Sec895$39656% Off OUR GUARANTEE TO YOU satisfied POSI-CURE please return unused portion within 30 days full refundNo questions asked SHELDONS HOBBY SHOP 3157 Alum Rock Ave Jose CA 95127r FOR ORDERS ONLY PLEASE 800 228-32370408 251-0789 Out State INFO 408 251-0787 California Hours Mon-Wed Fri & Sat 930-530 Thin 930-900 1200-500 destroyer USS Hoel travels have seen recurring problem Navy Exchange almost Navy base Ive visited will sell radio frequency anyone anything want done because no clear ID car boat aircraft use radio Sales personnel involved RC hobby dont realize what can lead said something about November Model Aviation Ill bet Navy aint ones letting happen So mark radios factory could save lot trouble maybe some airplanes such label See elsewhere columnJP anyone could figure out radio goes model selling prod uct whether involved hobby first read Davids letter struck suggestion ID label radio car/boat aircraftonly simple straightforward wondered nobody previ ously suggested Maybe has pre viously suggested rejected because reason another Obviously mark ing transmitter its use because its frequency will work transmitter frequency cannot changed However feature interchangeable RF module module itself could bear label indicating aircraft-only boat car-only use seems likely future will increasing number multi-frequency radios such currently-available Kraft Channel-Max synthesizes available RC frequencies Since AMA recommends displaying proper flag channel identification both contest sport flying manufacturers flags channel markers could include label indicating type use aircraft boat/car last months Safety column topic discussion should informative uniform instruc tions accompanying RC equipment seems radio systems should contain instructions lists frequencies designated aircraft boat/car look page 129 current 1986-87 AMA rule book states USE OF RADIO TUNED TO AIR CRAFT-ONLY FREQUENCY IN CAR OR BOAT IS AGAINST THE LAW case didnt already know law statement refers FCC regulation intend pass David Lewis sugges tion use-identification label AMA Safety Frequency Committees consideration note Dave Brown AMA District III VP member Safety Committee VP col umn February 1986 issue reports Frequency Committee meeting Continued page 122 20 Model Aviation F L IpJw per oruer FAST SERVICE COD ADD $190 POWERED MODELS Quality ormance ndability 1AA Control Line Airplanes Engines Accessories R/C Sailplanes Airplanes R/C Off-Road Cars SEND BASE FOR FREE MINI CATALOG COX HOBBIES INC 1525 E Warner Ave Santa Ana CA 92705 ATTENTION 1/4 SCALERS EPOXY GLASS COWLS FOR NOSEN PICA SID MORGAN BALSA USA PLATi CONCEPT FLEET HOSTETLER ACM T-CRAPT SHEBER PITTS N V SCALE SUPER CUB POKKER D-7 BOEING P12 P26 F4B2 F4B4 SPARROW HAWK GEE BEE MOD Y MACBAlERS TURBULENT CHRISTEN EAGLE BRISIGHELLAS STARDUSTER II SCALE J3-Bl BABY FLYBABY N OTHERS WHEEL PANTS FOR CITABRIA STARGUSTER II PEflS SKYBOLT LIBERTY SPORT CHRISTEN EAGLE PEE HAWK MULLIGAN N OTHERS LARGE SCALE PLANS AVAILABLE Please send $100 complete list supply ModelerS fiberglass parts plans Write Call us T & D FIBERGLASS SPECIALTIES 3B92B BLOCK GARDEN CITY MI 4B13B PHONE 3131421-6358 BRAZED & HEATTREATEO WIRE GEARS N cABANES PHONE 13131261-9064 PILOTS TS RIOR TS T THE MOST SUPERIOR PILOT FIGURE ON THE MARKET LIGHTEST WEIGHT MOST REALISTIC AVAILABLE GIVE YOUR PLANE PILOT FOR YOUR NEWEST OLDEST OR NEXT CREATION R YOURS TODAY FULL FIGURES CIVILIANWWII MILITARY 1/3 Scale $19951/5 Navy $1395 1/4 Scale14951/6AAF1195 1 /5 Scale1295 Plus 1/12 Scale895$250 shipping 1/12 Chopper 895each figure KNIGHTS OF THE AIR 1400 Rte 22 West Friendship MD 21794 301-489-5050 Letters Editor Continued page 12 compiling error having gone undetected long quantity E1115/61 usually much smaller quantity L*S2/Sl As such little error pro duced used probably noticed attributed geometric variations actual model Mr Donatelli found error may have used design di mensions producing severe imbab ance So Line 760 should read PL*S2/SlE1/15/Gl apologies error must lot modelers out computers already getting mail about article Design Analysis Program Dick Sarpolus Shrewsbury NJ Safety Preston Continued page 20 stated experiencing prob lems some parts country RC cars buggies using frequencies reserved aircraft. Perhaps Davids label suggestion can help alleviate some problems FlutterAnother item mentioned last months Safety column suggestion modeler should man datory checks models prevent con trol surface flutter November 1985 issue Corsair newsletter Joint Military R/G Fliers Club editor Marlin Kinning article flutter written noted modeler Cliff Weirick benefit readers may know what flutter can model Im reproducing Cliffs article FLUTTER Most know what seem some fliers dontor dont care break flutter down two levels full blown FLUTTER very destructive force second BUZZ Buzz too very destructive force slightly dif ferent way Lets look FLUTTER first can destroy airplane quicker can blink eye can attack sur face plane its prime targets ailerons followed closely elevator rudder flutter starts matter time until surface itself leaves plane takes sur face attached case two wings elevator counts up three airplanes stunt job wing failure next two Formula Ones Another aileron wing other elevator Actu ally very famousor should say infamouscrash lot oldtimers will remember Nats Los Alamitos NAS Boy what mess Now know what flutter can lets think about BUZZ hard describe because cant hear power model unless engine dead can hear flutter loud est engines whining away Buzz tends destroy servosand ultimately plane tends ruin gears worse yet attacks feedback pot ser vo does wearing small area usually around level-flight neutral position happens wonder sometimes controls may act funny What causes buzz Primarily two things Loose control surfaces sloppy tail-heavy loose sloppy pushrods etc see control surfaces look ready fall off airplane yet pilots ignore Same way pushrods Some builders drill %2-in holes control horn use 46-in wire Thats really asking sum up check things time go out fly remem ber tight will wear out get loose Have safe moath John Preston 12235 Tildenwood Dr Rockville MD 20852 responding advertisers mention read aboutthem ModelAviation drivers fuel pumps rolled aisles over power panels gallon fuel cans transmitter tray must got hand-held units Field boxes heavy wacky high-techand prop can cost seven bucks about power panel under nose run engines fancy hinged lids prevent getting anything plane figure top wedding cake ends up ground crawling aroundeasier get ting up down like jive puppet Im back knees now cant get up Legs no legs question Bill H Greenhalgh man after own heart dont have ambition brains too suffering herd guy lives place called Wetumpka Alabama must have right stuff am another old coot Au Good name next modeL built first model airplane back 1920s Bill edifies us after 30 years Air Corps/Air Force another 10 years doingthings government heart problem came back modeling After building Sig Kadet bitten RC bug since have built several airplanes mostly scratch Being too old hands knees bit fueling starting airplanes put folding legs huge field box raise level permitted work standing position course field box/stand weighed much took two us move After building some plant stands PVC plastic pipe wife realized could have light field stand could handle easily comfort several months now have using stand shown enclosed photographs Built 1-in PVC pipe consists two ends two shelves supports airplane fastened ends bolts wing nuts permitting quicikly change fit different fuselages padding fuselage supports insulation sold PVC pipes 1 22 Model Aviation Plane Talk/Winter Continued page 37 two shelves simply two straight pipes held together sheet hardboard shelves ends joined spring clips shown pictures whole thing disassembles quickly fit car trunks room spare usually leave assembled carry airplane van Once decided sizes wanted figured out parts list construction took less hour expenditure less $10 field stand doubles great work stand shop stand problem solved turned problem equipment carried old field box Using scrap plywood built three boxes fueling box carries half-gallon plastic fuel tank 12-volt battery electric fuel pump starter box includes 12-volt battery power panel storage space glow plugs small tools electric starter tool box has drawer small tools parts storage compartments spare propellers larger tools equip ment cleaning equipment other essential items seldom needed put cleats ends bottom box fit over shelves keep boxes vibrating off shelf boxes quite light easily handled two 12-volt batteries provide back up prevent loss flying session forget charge Add folding chair jug coffee iced tea depending upon tempera ture have makings com fortable enjoyable flying session know youngsters will sneer such sissy stuff thought would pass along whatever worth hope will interest some other old-timers senior citizens seem coming RC hobby simplifi cation equipment might ensure sustained interest pleasant flying field conditions Thus spake Bill Greenhalgh Wetump ka AL Favor requested Will something cause close heart February 1986 ModelAirplane News Hal deBolt began new long-needed feature Golden Age RC has making long time us have put heads together help make possible always wanted self colunm specifically RC have interest Antique OldTimer modeling SAM Society Antique Modelers makes go Thats primarily based old Free Flight models RC-assist involved interest Old-Timer Control Line models obvious potential RC its own right has neglecteduntil now know 1950s 6-ft 35powered Smog Hog example does anything can Saturday Night Specialexcept go straight up Its easier safer fly things flown now came low-wing Smog Hog Sig Mfg Co perceived Kasmirski 45-powered Orion 1960 Aero batics World Champion still matches performance modern engine anything can think hot aerobatic airplane hundreds published once-kitted wonderful air planesdeltas canards name Ob viously an Antique era OldTimer era Nostalgic erastarting things like Goods Big Guff prewar days Taurus Orion 1960 Buzzard Bombshells could promote competitions aware majority will prefer simply enjoy flying historic planes Please contribute Hals column us hundreds pictures out Send background info Harold deBolt 2206 Greenwich Dr Kings Pt Sun City Center FL 33570 Without contributions column like deBolts cannot continued indefi nitely Photographic examples particular needed Falcon OldTimer dating late SOs Beams Esquires H-Rays Berkeleys Hollinger J 3 Fairchild PT on Walt Goods series history Radio Control began last month Chet Lanzo has asked help major presentation 1934 RC-1 prehistoric radio gear People keep building Krackerjac Rookie designers have same experience Beyond historic stuff now appearing magazine no continuity except deBolts Golden Age thing requires everyone interested assure prospers pictures good information Mining gold depends have gratitude joining effort Before long youll have yourself thank having bothered Bill Winter 4432 Altura Ct Fajifax VA 22030 Radio Technique/Myers Continued page 38 buy products object will likely accompanied warning literature manufacturer will receptive constructive criticism object being sold lacks such obvious liability/litigation potential manufacturers interest usually concen trates itself price profit performed static structural load test airplanes towhook/fuselage/wing combination Jugs water provided test load pint water weighs pound Note done before wing covered wing should depend covering strength sides something cracks want see well hear wing spar strong enough Only dowel needed changed Continued page 126 April 1986 123 C C El I m z 0 z z C 0 0 m I m 0 q 0 CD C 0 0 C -4 0 CD 0 Co U 0 -L N 0 0 01 x x N
Edition: Model Aviation - 1986/04
Page Numbers: 14, 16, 18, 20, 122, 123
___John Preston___________________________ Safety Comes First weighted blades RC Heli copters safety hints propel lers legal RC frequencies prob lem surfaces again eliminating flutter buzz CORRECTION I recently received let ter Glenn Scillian concerning report accident flying RC Helicopter reported column January 1986 issue Model Aviation seems report accident completely wrong may disservice RC Helicopter builders fliers previous report stated Glenn struck leg unweighted rotor blade thrown off models Glenn states let ter struck one-ounce lead weight come loose rotor blades letter Glenn enclosed copy letter wrote November 1984 Larry Jolly described accident dont believe Larry ever reported incident RC Helicopters column set record straight Im going use Glenns own words describe what really happened also apologize wrong account January issue summer 1983 suffered serious accident struck lead weight blade Heli copter found added ounce lead shape disk about inch diameter about A-inch thick blade model flew beau tifullymuch better unweight ed blades As far can recall blades never touched ground tall boom slugs epoxied cavity about three inches outside end blade cavity half hardwood half balsa grant long slender slug nesting en tirely hardwood would have safer disk shape recommended manufacturer use its Helicopters day revving engine up Helicopter sitting OR 004 ON Li Reader David Lewis suggests Iactoryappiied stickers RC transmitters system boxes such could help salespersons hobby shops sell legal radios novice RC hobbyists Preston discusses problem column ground about 12 feet front tail toward Just moment lift-off slug chunk wood blade let go struck right shin two inches below kneecap knocked down still held transmitter shut throttle down now-unbalanced copter thrashed violently ground literally tore off tail boom friend finally stopped blades pulled off fuel line Other friends applied some clean towels wound bleeding moderately drain ing bone-marrow oil driven nearest hospital about five miles away treated outpatient Exami Continued page 16 t II I5 ITS O5VIOLALY FRLAENCY AIkCY-AET cLY 14 Model Aviation UNIVERSAL IN-COWL AIRCRAFT MUFFLERS 19-4045-6075-13 engines UPSIONT ox INVICIED ENOINE Jt-40119-401600 JI-OGi45-901700 11-90175-131900 TTLAS0577 0T0530le0705e0 DUN tSmee 0e5 soc OATS 757 bA 7550 77 5577 504 Most versatile mufflers ever offered Designed fit inside cowls lImited soace can also used HELICOPTERS BOATS 0 For UPRIGHT INVERTED SIDE mounted engines 0 Exhaust tubes point almost direction S Worm drive clamp universal mounting can bolted directly engine BASIC DIMENSIONS INCLUDES Exhaust pipe extensions clamps553003737003007370700 worm drive clomp muffler alignment 0i plate gasket mounting screws S nOt 3073~IC 9031 hObby shop ORDER DIRECT tar rxnedote s9ment Check MO Visa MC COD accepted Add S260 tar UPS S200 tar COD 6% IcieR tax tar Cdt resident RETRACTABLE OW HOOK RELEASE Price SS90 Simplest reliable device available After line released hook retracts body unit leaving SMOOTH surface bottom aircraft No special attachments required N eight Y5 oz OTHER FOURMOST PRODUCTS 03C [5 ZAO[SW[TZ[5-] a S 164 School St Daly CIty CA 94014 415 756-3400 049/051 AIRFLO ENGINE MOUNT REDUCES DRAG VIBRATION FREE PRICE $300 40 AIRFLO ENGINE MOUNT IDEAL FOR QUICKY 500 PRICE $630 Fuel Fitting Sets Fuel Shut Off Fuel Manifold Gapless Hinges Gapless Hinge Slotter Strut Fairings Cockpit Coaming nation showed chipped tibia fortu nately no damage patella ligament wear soft cast about three weeks healing complete four five weeks Before returned flying weighted blades dis carded replaced Jeff Urcan s heavy blades As far can see fly well lead-weighted blades Glenns letter described another inci dent friend hovering Helicopter about eye level lead weight blades let go case nobody struck flying weight damage Helicopter due its unbalanced main rotor blades Before leaving subject let re mind readers emergency competi tion rule published September 1984 issue Model Aviation out lawed metal blades knife-edged leading edges blades metal blades beyond point two inches blade root attachment point emer gency rule enacted under AMA con test board procedures permit AMA president concurrence appropriate Contest Board chairman take emergency action dictated situation However make such emergency rules change permanent must ratified vote entire Contest Board must take place tween four six weeks after publication emergency rules change mem bers Helicopter Contest Board voted against rule concerning Helicopter blades So weighted blades still permitted AMA-sanctioned Helicopter contests Note however FAI rules RC Helicopters page 106 1986-87 rule book per mit metal blades metal weights blades knife-like leading edges blades PropellersIt seems appropriate switch potential hazard Heli copter blades presented blades propellers fixed-wing models Two readers contacted during last month phone letter subject blade separation propellers phone call Paul Geders St Louis MO inquire whether particular type non-wood prop involved significantly blade-shedding incidents other types Apparently fellow club members wanted outlaw use prop based incident damaged blade let go combed cor respondence records concerning prop cidents didnt really find enough documented incidents make statis tically-valid conclusions However found interesting appeared incidents blades separating wooden props plastic props Please regard statement Continued page 18 16 Model Aviation UPWCCTIIDVINVfITRORORSRROSIOI lee 434057770073 5311 CATAIfl Winning Ideas FOURMOST nd SASE Complete Information Ave Forest Grove OR 97116 PRODUCTS Phone 503 357-2732 4 vOl ec &cP C Al A0S oBB~ sendOR -cl meaning plastic props safer wood props Id rather aware blades may separate prop no matter what material fabricated letter concerning props came AE Richt Scott Depot WV en closed instructions received some Graupner Super fiberglassreinforced nylon props purchased major mail order hobby retailer instructions entirely German appeared contain some warning statements would-be users AE stated German far goodbut apparently better since able decipher care should taken ensure props dry-out Periodic boiling storing wet rag appeared recommended second warning appeared state prop tip velocity should ex ceed 180 meters/second AE supplied following table listing maximum rpm various prop diameters will exceed 180 in/sec tip speed Prop DI S 6 7 8 9 9 l0 lOS II 12 125 13 14 15 Max RPM 27000 22500 19300 16900 15000 14200 13500 12800 12300 11200 10800 10400 9600 9000 have sent Graupner prop instruc tions German-born engineer friend request translation thing else importance pops up translation Ill include next Safe ty column Meanwhile time gets print should have translated instructions will forward reader sending SASE address end column Which frequency model let ter arrived just day too late included last months Safety column contained very simple remedy mix-up can occur hobby store owner either knowingly unknowingly sells radio aircraft-only fre quency customer plans use boat car think major hobby retailers aware fact aircraft-only boat/car-only RC frequencies However follow ing letter David Lewis points out may some sources radios sales personnel aware fact have Navy last five years am now serving aboard Continued page 20 18 Model Aviation Spec al Detergents help prevent yarn sh p omo e c ean burning Rust Preventatives protect expens ye eng nes f om corrosion SIG CHAMPION 2 STROKE FUEL FREIGHT FREE sHIPPING ON ORDERS OVER $1500COLLECT PINTQUARTGALLON55 GAL DRUM 0N omethane$315$450$1050 00 5Ntromethane$365$525$1250 00 10%Ntrornethane$415$550$1450 00 15%Nitromethane$430$625$1650 00 25%Nitrornethane$495$750$2095 00 35%Ntromethane$575$875$2495 00 SIGPREMIUM4-STROKE FUEL 10%Nltromethane$415$550$1395 00 15%Nitrornethane$425$625$1595 00 THE CHOICE OF CHAMPION FLYERS Fr ars 510 has blending fuel finest qual ty ingrec e arie alcuha 99 - ery best grade available nitromethaxe use 1i ira get hunest r volume tar maximum lubrication get eb[end ot Bakers AA Cara K sty Tecvniplate Racing Oil protect expensive erg rs r try tivest qual ty t xl tva -av re avy price Dant tube wurd tor try vome cry ciurse[ti See dealer first available order direct Call 247-5008 toll free orders Latest Catalog $300 ~- SIG MANUFACTURING CO Montezuma IA 50171 xervnvire DYNATHRUST PROPS look great too! ALL FUTURE PRODUCTION ON ALL SIZES WILL HAVE LOGO AND TIPS PAINTED SIZES CURRENTLY AVAILABLE 13x6 15x6 8 $700 18x6 810 $1000 22x8 10- $1800 14x6 16x6 8 20x6 810 0 AddlSlzesAvailable Soon 2541 NE 11th Court ano Beach Florida 33062 e 13051 941-9119 AVAILABLE FROM LEADING DEALERS AND DISTRUBUTORS DIRECT CYANOACRYLATE CIAL INTROOUCTORY OFFER ListSaleSavings 1 oz Fast Cure 3-5 Sec$2500/0 Off 2 oz Fast Cure 3-5 Sec895$39656% Off 1 oz Gap-Filling 5 Sec495$2450% Off 2 oz Gap-Filling 5 Sec895$39656% Off OUR GUARANTEE TO YOU satisfied POSI-CURE please return unused portion within 30 days full refundNo questions asked SHELDONS HOBBY SHOP 3157 Alum Rock Ave Jose CA 95127r FOR ORDERS ONLY PLEASE 800 228-32370408 251-0789 Out State INFO 408 251-0787 California Hours Mon-Wed Fri & Sat 930-530 Thin 930-900 1200-500 destroyer USS Hoel travels have seen recurring problem Navy Exchange almost Navy base Ive visited will sell radio frequency anyone anything want done because no clear ID car boat aircraft use radio Sales personnel involved RC hobby dont realize what can lead said something about November Model Aviation Ill bet Navy aint ones letting happen So mark radios factory could save lot trouble maybe some airplanes such label See elsewhere columnJP anyone could figure out radio goes model selling prod uct whether involved hobby first read Davids letter struck suggestion ID label radio car/boat aircraftonly simple straightforward wondered nobody previ ously suggested Maybe has pre viously suggested rejected because reason another Obviously mark ing transmitter its use because its frequency will work transmitter frequency cannot changed However feature interchangeable RF module module itself could bear label indicating aircraft-only boat car-only use seems likely future will increasing number multi-frequency radios such currently-available Kraft Channel-Max synthesizes available RC frequencies Since AMA recommends displaying proper flag channel identification both contest sport flying manufacturers flags channel markers could include label indicating type use aircraft boat/car last months Safety column topic discussion should informative uniform instruc tions accompanying RC equipment seems radio systems should contain instructions lists frequencies designated aircraft boat/car look page 129 current 1986-87 AMA rule book states USE OF RADIO TUNED TO AIR CRAFT-ONLY FREQUENCY IN CAR OR BOAT IS AGAINST THE LAW case didnt already know law statement refers FCC regulation intend pass David Lewis sugges tion use-identification label AMA Safety Frequency Committees consideration note Dave Brown AMA District III VP member Safety Committee VP col umn February 1986 issue reports Frequency Committee meeting Continued page 122 20 Model Aviation F L IpJw per oruer FAST SERVICE COD ADD $190 POWERED MODELS Quality ormance ndability 1AA Control Line Airplanes Engines Accessories R/C Sailplanes Airplanes R/C Off-Road Cars SEND BASE FOR FREE MINI CATALOG COX HOBBIES INC 1525 E Warner Ave Santa Ana CA 92705 ATTENTION 1/4 SCALERS EPOXY GLASS COWLS FOR NOSEN PICA SID MORGAN BALSA USA PLATi CONCEPT FLEET HOSTETLER ACM T-CRAPT SHEBER PITTS N V SCALE SUPER CUB POKKER D-7 BOEING P12 P26 F4B2 F4B4 SPARROW HAWK GEE BEE MOD Y MACBAlERS TURBULENT CHRISTEN EAGLE BRISIGHELLAS STARDUSTER II SCALE J3-Bl BABY FLYBABY N OTHERS WHEEL PANTS FOR CITABRIA STARGUSTER II PEflS SKYBOLT LIBERTY SPORT CHRISTEN EAGLE PEE HAWK MULLIGAN N OTHERS LARGE SCALE PLANS AVAILABLE Please send $100 complete list supply ModelerS fiberglass parts plans Write Call us T & D FIBERGLASS SPECIALTIES 3B92B BLOCK GARDEN CITY MI 4B13B PHONE 3131421-6358 BRAZED & HEATTREATEO WIRE GEARS N cABANES PHONE 13131261-9064 PILOTS TS RIOR TS T THE MOST SUPERIOR PILOT FIGURE ON THE MARKET LIGHTEST WEIGHT MOST REALISTIC AVAILABLE GIVE YOUR PLANE PILOT FOR YOUR NEWEST OLDEST OR NEXT CREATION R YOURS TODAY FULL FIGURES CIVILIANWWII MILITARY 1/3 Scale $19951/5 Navy $1395 1/4 Scale14951/6AAF1195 1 /5 Scale1295 Plus 1/12 Scale895$250 shipping 1/12 Chopper 895each figure KNIGHTS OF THE AIR 1400 Rte 22 West Friendship MD 21794 301-489-5050 Letters Editor Continued page 12 compiling error having gone undetected long quantity E1115/61 usually much smaller quantity L*S2/Sl As such little error pro duced used probably noticed attributed geometric variations actual model Mr Donatelli found error may have used design di mensions producing severe imbab ance So Line 760 should read PL*S2/SlE1/15/Gl apologies error must lot modelers out computers already getting mail about article Design Analysis Program Dick Sarpolus Shrewsbury NJ Safety Preston Continued page 20 stated experiencing prob lems some parts country RC cars buggies using frequencies reserved aircraft. Perhaps Davids label suggestion can help alleviate some problems FlutterAnother item mentioned last months Safety column suggestion modeler should man datory checks models prevent con trol surface flutter November 1985 issue Corsair newsletter Joint Military R/G Fliers Club editor Marlin Kinning article flutter written noted modeler Cliff Weirick benefit readers may know what flutter can model Im reproducing Cliffs article FLUTTER Most know what seem some fliers dontor dont care break flutter down two levels full blown FLUTTER very destructive force second BUZZ Buzz too very destructive force slightly dif ferent way Lets look FLUTTER first can destroy airplane quicker can blink eye can attack sur face plane its prime targets ailerons followed closely elevator rudder flutter starts matter time until surface itself leaves plane takes sur face attached case two wings elevator counts up three airplanes stunt job wing failure next two Formula Ones Another aileron wing other elevator Actu ally very famousor should say infamouscrash lot oldtimers will remember Nats Los Alamitos NAS Boy what mess Now know what flutter can lets think about BUZZ hard describe because cant hear power model unless engine dead can hear flutter loud est engines whining away Buzz tends destroy servosand ultimately plane tends ruin gears worse yet attacks feedback pot ser vo does wearing small area usually around level-flight neutral position happens wonder sometimes controls may act funny What causes buzz Primarily two things Loose control surfaces sloppy tail-heavy loose sloppy pushrods etc see control surfaces look ready fall off airplane yet pilots ignore Same way pushrods Some builders drill %2-in holes control horn use 46-in wire Thats really asking sum up check things time go out fly remem ber tight will wear out get loose Have safe moath John Preston 12235 Tildenwood Dr Rockville MD 20852 responding advertisers mention read aboutthem ModelAviation drivers fuel pumps rolled aisles over power panels gallon fuel cans transmitter tray must got hand-held units Field boxes heavy wacky high-techand prop can cost seven bucks about power panel under nose run engines fancy hinged lids prevent getting anything plane figure top wedding cake ends up ground crawling aroundeasier get ting up down like jive puppet Im back knees now cant get up Legs no legs question Bill H Greenhalgh man after own heart dont have ambition brains too suffering herd guy lives place called Wetumpka Alabama must have right stuff am another old coot Au Good name next modeL built first model airplane back 1920s Bill edifies us after 30 years Air Corps/Air Force another 10 years doingthings government heart problem came back modeling After building Sig Kadet bitten RC bug since have built several airplanes mostly scratch Being too old hands knees bit fueling starting airplanes put folding legs huge field box raise level permitted work standing position course field box/stand weighed much took two us move After building some plant stands PVC plastic pipe wife realized could have light field stand could handle easily comfort several months now have using stand shown enclosed photographs Built 1-in PVC pipe consists two ends two shelves supports airplane fastened ends bolts wing nuts permitting quicikly change fit different fuselages padding fuselage supports insulation sold PVC pipes 1 22 Model Aviation Plane Talk/Winter Continued page 37 two shelves simply two straight pipes held together sheet hardboard shelves ends joined spring clips shown pictures whole thing disassembles quickly fit car trunks room spare usually leave assembled carry airplane van Once decided sizes wanted figured out parts list construction took less hour expenditure less $10 field stand doubles great work stand shop stand problem solved turned problem equipment carried old field box Using scrap plywood built three boxes fueling box carries half-gallon plastic fuel tank 12-volt battery electric fuel pump starter box includes 12-volt battery power panel storage space glow plugs small tools electric starter tool box has drawer small tools parts storage compartments spare propellers larger tools equip ment cleaning equipment other essential items seldom needed put cleats ends bottom box fit over shelves keep boxes vibrating off shelf boxes quite light easily handled two 12-volt batteries provide back up prevent loss flying session forget charge Add folding chair jug coffee iced tea depending upon tempera ture have makings com fortable enjoyable flying session know youngsters will sneer such sissy stuff thought would pass along whatever worth hope will interest some other old-timers senior citizens seem coming RC hobby simplifi cation equipment might ensure sustained interest pleasant flying field conditions Thus spake Bill Greenhalgh Wetump ka AL Favor requested Will something cause close heart February 1986 ModelAirplane News Hal deBolt began new long-needed feature Golden Age RC has making long time us have put heads together help make possible always wanted self colunm specifically RC have interest Antique OldTimer modeling SAM Society Antique Modelers makes go Thats primarily based old Free Flight models RC-assist involved interest Old-Timer Control Line models obvious potential RC its own right has neglecteduntil now know 1950s 6-ft 35powered Smog Hog example does anything can Saturday Night Specialexcept go straight up Its easier safer fly things flown now came low-wing Smog Hog Sig Mfg Co perceived Kasmirski 45-powered Orion 1960 Aero batics World Champion still matches performance modern engine anything can think hot aerobatic airplane hundreds published once-kitted wonderful air planesdeltas canards name Ob viously an Antique era OldTimer era Nostalgic erastarting things like Goods Big Guff prewar days Taurus Orion 1960 Buzzard Bombshells could promote competitions aware majority will prefer simply enjoy flying historic planes Please contribute Hals column us hundreds pictures out Send background info Harold deBolt 2206 Greenwich Dr Kings Pt Sun City Center FL 33570 Without contributions column like deBolts cannot continued indefi nitely Photographic examples particular needed Falcon OldTimer dating late SOs Beams Esquires H-Rays Berkeleys Hollinger J 3 Fairchild PT on Walt Goods series history Radio Control began last month Chet Lanzo has asked help major presentation 1934 RC-1 prehistoric radio gear People keep building Krackerjac Rookie designers have same experience Beyond historic stuff now appearing magazine no continuity except deBolts Golden Age thing requires everyone interested assure prospers pictures good information Mining gold depends have gratitude joining effort Before long youll have yourself thank having bothered Bill Winter 4432 Altura Ct Fajifax VA 22030 Radio Technique/Myers Continued page 38 buy products object will likely accompanied warning literature manufacturer will receptive constructive criticism object being sold lacks such obvious liability/litigation potential manufacturers interest usually concen trates itself price profit performed static structural load test airplanes towhook/fuselage/wing combination Jugs water provided test load pint water weighs pound Note done before wing covered wing should depend covering strength sides something cracks want see well hear wing spar strong enough Only dowel needed changed Continued page 126 April 1986 123 C C El I m z 0 z z C 0 0 m I m 0 q 0 CD C 0 0 C -4 0 CD 0 Co U 0 -L N 0 0 01 x x N
Edition: Model Aviation - 1986/04
Page Numbers: 14, 16, 18, 20, 122, 123
___John Preston___________________________ Safety Comes First weighted blades RC Heli copters safety hints propel lers legal RC frequencies prob lem surfaces again eliminating flutter buzz CORRECTION I recently received let ter Glenn Scillian concerning report accident flying RC Helicopter reported column January 1986 issue Model Aviation seems report accident completely wrong may disservice RC Helicopter builders fliers previous report stated Glenn struck leg unweighted rotor blade thrown off models Glenn states let ter struck one-ounce lead weight come loose rotor blades letter Glenn enclosed copy letter wrote November 1984 Larry Jolly described accident dont believe Larry ever reported incident RC Helicopters column set record straight Im going use Glenns own words describe what really happened also apologize wrong account January issue summer 1983 suffered serious accident struck lead weight blade Heli copter found added ounce lead shape disk about inch diameter about A-inch thick blade model flew beau tifullymuch better unweight ed blades As far can recall blades never touched ground tall boom slugs epoxied cavity about three inches outside end blade cavity half hardwood half balsa grant long slender slug nesting en tirely hardwood would have safer disk shape recommended manufacturer use its Helicopters day revving engine up Helicopter sitting OR 004 ON Li Reader David Lewis suggests Iactoryappiied stickers RC transmitters system boxes such could help salespersons hobby shops sell legal radios novice RC hobbyists Preston discusses problem column ground about 12 feet front tail toward Just moment lift-off slug chunk wood blade let go struck right shin two inches below kneecap knocked down still held transmitter shut throttle down now-unbalanced copter thrashed violently ground literally tore off tail boom friend finally stopped blades pulled off fuel line Other friends applied some clean towels wound bleeding moderately drain ing bone-marrow oil driven nearest hospital about five miles away treated outpatient Exami Continued page 16 t II I5 ITS O5VIOLALY FRLAENCY AIkCY-AET cLY 14 Model Aviation UNIVERSAL IN-COWL AIRCRAFT MUFFLERS 19-4045-6075-13 engines UPSIONT ox INVICIED ENOINE Jt-40119-401600 JI-OGi45-901700 11-90175-131900 TTLAS0577 0T0530le0705e0 DUN tSmee 0e5 soc OATS 757 bA 7550 77 5577 504 Most versatile mufflers ever offered Designed fit inside cowls lImited soace can also used HELICOPTERS BOATS 0 For UPRIGHT INVERTED SIDE mounted engines 0 Exhaust tubes point almost direction S Worm drive clamp universal mounting can bolted directly engine BASIC DIMENSIONS INCLUDES Exhaust pipe extensions clamps553003737003007370700 worm drive clomp muffler alignment 0i plate gasket mounting screws S nOt 3073~IC 9031 hObby shop ORDER DIRECT tar rxnedote s9ment Check MO Visa MC COD accepted Add S260 tar UPS S200 tar COD 6% IcieR tax tar Cdt resident RETRACTABLE OW HOOK RELEASE Price SS90 Simplest reliable device available After line released hook retracts body unit leaving SMOOTH surface bottom aircraft No special attachments required N eight Y5 oz OTHER FOURMOST PRODUCTS 03C [5 ZAO[SW[TZ[5-] a S 164 School St Daly CIty CA 94014 415 756-3400 049/051 AIRFLO ENGINE MOUNT REDUCES DRAG VIBRATION FREE PRICE $300 40 AIRFLO ENGINE MOUNT IDEAL FOR QUICKY 500 PRICE $630 Fuel Fitting Sets Fuel Shut Off Fuel Manifold Gapless Hinges Gapless Hinge Slotter Strut Fairings Cockpit Coaming nation showed chipped tibia fortu nately no damage patella ligament wear soft cast about three weeks healing complete four five weeks Before returned flying weighted blades dis carded replaced Jeff Urcan s heavy blades As far can see fly well lead-weighted blades Glenns letter described another inci dent friend hovering Helicopter about eye level lead weight blades let go case nobody struck flying weight damage Helicopter due its unbalanced main rotor blades Before leaving subject let re mind readers emergency competi tion rule published September 1984 issue Model Aviation out lawed metal blades knife-edged leading edges blades metal blades beyond point two inches blade root attachment point emer gency rule enacted under AMA con test board procedures permit AMA president concurrence appropriate Contest Board chairman take emergency action dictated situation However make such emergency rules change permanent must ratified vote entire Contest Board must take place tween four six weeks after publication emergency rules change mem bers Helicopter Contest Board voted against rule concerning Helicopter blades So weighted blades still permitted AMA-sanctioned Helicopter contests Note however FAI rules RC Helicopters page 106 1986-87 rule book per mit metal blades metal weights blades knife-like leading edges blades PropellersIt seems appropriate switch potential hazard Heli copter blades presented blades propellers fixed-wing models Two readers contacted during last month phone letter subject blade separation propellers phone call Paul Geders St Louis MO inquire whether particular type non-wood prop involved significantly blade-shedding incidents other types Apparently fellow club members wanted outlaw use prop based incident damaged blade let go combed cor respondence records concerning prop cidents didnt really find enough documented incidents make statis tically-valid conclusions However found interesting appeared incidents blades separating wooden props plastic props Please regard statement Continued page 18 16 Model Aviation UPWCCTIIDVINVfITRORORSRROSIOI lee 434057770073 5311 CATAIfl Winning Ideas FOURMOST nd SASE Complete Information Ave Forest Grove OR 97116 PRODUCTS Phone 503 357-2732 4 vOl ec &cP C Al A0S oBB~ sendOR -cl meaning plastic props safer wood props Id rather aware blades may separate prop no matter what material fabricated letter concerning props came AE Richt Scott Depot WV en closed instructions received some Graupner Super fiberglassreinforced nylon props purchased major mail order hobby retailer instructions entirely German appeared contain some warning statements would-be users AE stated German far goodbut apparently better since able decipher care should taken ensure props dry-out Periodic boiling storing wet rag appeared recommended second warning appeared state prop tip velocity should ex ceed 180 meters/second AE supplied following table listing maximum rpm various prop diameters will exceed 180 in/sec tip speed Prop DI S 6 7 8 9 9 l0 lOS II 12 125 13 14 15 Max RPM 27000 22500 19300 16900 15000 14200 13500 12800 12300 11200 10800 10400 9600 9000 have sent Graupner prop instruc tions German-born engineer friend request translation thing else importance pops up translation Ill include next Safe ty column Meanwhile time gets print should have translated instructions will forward reader sending SASE address end column Which frequency model let ter arrived just day too late included last months Safety column contained very simple remedy mix-up can occur hobby store owner either knowingly unknowingly sells radio aircraft-only fre quency customer plans use boat car think major hobby retailers aware fact aircraft-only boat/car-only RC frequencies However follow ing letter David Lewis points out may some sources radios sales personnel aware fact have Navy last five years am now serving aboard Continued page 20 18 Model Aviation Spec al Detergents help prevent yarn sh p omo e c ean burning Rust Preventatives protect expens ye eng nes f om corrosion SIG CHAMPION 2 STROKE FUEL FREIGHT FREE sHIPPING ON ORDERS OVER $1500COLLECT PINTQUARTGALLON55 GAL DRUM 0N omethane$315$450$1050 00 5Ntromethane$365$525$1250 00 10%Ntrornethane$415$550$1450 00 15%Nitromethane$430$625$1650 00 25%Nitrornethane$495$750$2095 00 35%Ntromethane$575$875$2495 00 SIGPREMIUM4-STROKE FUEL 10%Nltromethane$415$550$1395 00 15%Nitrornethane$425$625$1595 00 THE CHOICE OF CHAMPION FLYERS Fr ars 510 has blending fuel finest qual ty ingrec e arie alcuha 99 - ery best grade available nitromethaxe use 1i ira get hunest r volume tar maximum lubrication get eb[end ot Bakers AA Cara K sty Tecvniplate Racing Oil protect expensive erg rs r try tivest qual ty t xl tva -av re avy price Dant tube wurd tor try vome cry ciurse[ti See dealer first available order direct Call 247-5008 toll free orders Latest Catalog $300 ~- SIG MANUFACTURING CO Montezuma IA 50171 xervnvire DYNATHRUST PROPS look great too! ALL FUTURE PRODUCTION ON ALL SIZES WILL HAVE LOGO AND TIPS PAINTED SIZES CURRENTLY AVAILABLE 13x6 15x6 8 $700 18x6 810 $1000 22x8 10- $1800 14x6 16x6 8 20x6 810 0 AddlSlzesAvailable Soon 2541 NE 11th Court ano Beach Florida 33062 e 13051 941-9119 AVAILABLE FROM LEADING DEALERS AND DISTRUBUTORS DIRECT CYANOACRYLATE CIAL INTROOUCTORY OFFER ListSaleSavings 1 oz Fast Cure 3-5 Sec$2500/0 Off 2 oz Fast Cure 3-5 Sec895$39656% Off 1 oz Gap-Filling 5 Sec495$2450% Off 2 oz Gap-Filling 5 Sec895$39656% Off OUR GUARANTEE TO YOU satisfied POSI-CURE please return unused portion within 30 days full refundNo questions asked SHELDONS HOBBY SHOP 3157 Alum Rock Ave Jose CA 95127r FOR ORDERS ONLY PLEASE 800 228-32370408 251-0789 Out State INFO 408 251-0787 California Hours Mon-Wed Fri & Sat 930-530 Thin 930-900 1200-500 destroyer USS Hoel travels have seen recurring problem Navy Exchange almost Navy base Ive visited will sell radio frequency anyone anything want done because no clear ID car boat aircraft use radio Sales personnel involved RC hobby dont realize what can lead said something about November Model Aviation Ill bet Navy aint ones letting happen So mark radios factory could save lot trouble maybe some airplanes such label See elsewhere columnJP anyone could figure out radio goes model selling prod uct whether involved hobby first read Davids letter struck suggestion ID label radio car/boat aircraftonly simple straightforward wondered nobody previ ously suggested Maybe has pre viously suggested rejected because reason another Obviously mark ing transmitter its use because its frequency will work transmitter frequency cannot changed However feature interchangeable RF module module itself could bear label indicating aircraft-only boat car-only use seems likely future will increasing number multi-frequency radios such currently-available Kraft Channel-Max synthesizes available RC frequencies Since AMA recommends displaying proper flag channel identification both contest sport flying manufacturers flags channel markers could include label indicating type use aircraft boat/car last months Safety column topic discussion should informative uniform instruc tions accompanying RC equipment seems radio systems should contain instructions lists frequencies designated aircraft boat/car look page 129 current 1986-87 AMA rule book states USE OF RADIO TUNED TO AIR CRAFT-ONLY FREQUENCY IN CAR OR BOAT IS AGAINST THE LAW case didnt already know law statement refers FCC regulation intend pass David Lewis sugges tion use-identification label AMA Safety Frequency Committees consideration note Dave Brown AMA District III VP member Safety Committee VP col umn February 1986 issue reports Frequency Committee meeting Continued page 122 20 Model Aviation F L IpJw per oruer FAST SERVICE COD ADD $190 POWERED MODELS Quality ormance ndability 1AA Control Line Airplanes Engines Accessories R/C Sailplanes Airplanes R/C Off-Road Cars SEND BASE FOR FREE MINI CATALOG COX HOBBIES INC 1525 E Warner Ave Santa Ana CA 92705 ATTENTION 1/4 SCALERS EPOXY GLASS COWLS FOR NOSEN PICA SID MORGAN BALSA USA PLATi CONCEPT FLEET HOSTETLER ACM T-CRAPT SHEBER PITTS N V SCALE SUPER CUB POKKER D-7 BOEING P12 P26 F4B2 F4B4 SPARROW HAWK GEE BEE MOD Y MACBAlERS TURBULENT CHRISTEN EAGLE BRISIGHELLAS STARDUSTER II SCALE J3-Bl BABY FLYBABY N OTHERS WHEEL PANTS FOR CITABRIA STARGUSTER II PEflS SKYBOLT LIBERTY SPORT CHRISTEN EAGLE PEE HAWK MULLIGAN N OTHERS LARGE SCALE PLANS AVAILABLE Please send $100 complete list supply ModelerS fiberglass parts plans Write Call us T & D FIBERGLASS SPECIALTIES 3B92B BLOCK GARDEN CITY MI 4B13B PHONE 3131421-6358 BRAZED & HEATTREATEO WIRE GEARS N cABANES PHONE 13131261-9064 PILOTS TS RIOR TS T THE MOST SUPERIOR PILOT FIGURE ON THE MARKET LIGHTEST WEIGHT MOST REALISTIC AVAILABLE GIVE YOUR PLANE PILOT FOR YOUR NEWEST OLDEST OR NEXT CREATION R YOURS TODAY FULL FIGURES CIVILIANWWII MILITARY 1/3 Scale $19951/5 Navy $1395 1/4 Scale14951/6AAF1195 1 /5 Scale1295 Plus 1/12 Scale895$250 shipping 1/12 Chopper 895each figure KNIGHTS OF THE AIR 1400 Rte 22 West Friendship MD 21794 301-489-5050 Letters Editor Continued page 12 compiling error having gone undetected long quantity E1115/61 usually much smaller quantity L*S2/Sl As such little error pro duced used probably noticed attributed geometric variations actual model Mr Donatelli found error may have used design di mensions producing severe imbab ance So Line 760 should read PL*S2/SlE1/15/Gl apologies error must lot modelers out computers already getting mail about article Design Analysis Program Dick Sarpolus Shrewsbury NJ Safety Preston Continued page 20 stated experiencing prob lems some parts country RC cars buggies using frequencies reserved aircraft. Perhaps Davids label suggestion can help alleviate some problems FlutterAnother item mentioned last months Safety column suggestion modeler should man datory checks models prevent con trol surface flutter November 1985 issue Corsair newsletter Joint Military R/G Fliers Club editor Marlin Kinning article flutter written noted modeler Cliff Weirick benefit readers may know what flutter can model Im reproducing Cliffs article FLUTTER Most know what seem some fliers dontor dont care break flutter down two levels full blown FLUTTER very destructive force second BUZZ Buzz too very destructive force slightly dif ferent way Lets look FLUTTER first can destroy airplane quicker can blink eye can attack sur face plane its prime targets ailerons followed closely elevator rudder flutter starts matter time until surface itself leaves plane takes sur face attached case two wings elevator counts up three airplanes stunt job wing failure next two Formula Ones Another aileron wing other elevator Actu ally very famousor should say infamouscrash lot oldtimers will remember Nats Los Alamitos NAS Boy what mess Now know what flutter can lets think about BUZZ hard describe because cant hear power model unless engine dead can hear flutter loud est engines whining away Buzz tends destroy servosand ultimately plane tends ruin gears worse yet attacks feedback pot ser vo does wearing small area usually around level-flight neutral position happens wonder sometimes controls may act funny What causes buzz Primarily two things Loose control surfaces sloppy tail-heavy loose sloppy pushrods etc see control surfaces look ready fall off airplane yet pilots ignore Same way pushrods Some builders drill %2-in holes control horn use 46-in wire Thats really asking sum up check things time go out fly remem ber tight will wear out get loose Have safe moath John Preston 12235 Tildenwood Dr Rockville MD 20852 responding advertisers mention read aboutthem ModelAviation drivers fuel pumps rolled aisles over power panels gallon fuel cans transmitter tray must got hand-held units Field boxes heavy wacky high-techand prop can cost seven bucks about power panel under nose run engines fancy hinged lids prevent getting anything plane figure top wedding cake ends up ground crawling aroundeasier get ting up down like jive puppet Im back knees now cant get up Legs no legs question Bill H Greenhalgh man after own heart dont have ambition brains too suffering herd guy lives place called Wetumpka Alabama must have right stuff am another old coot Au Good name next modeL built first model airplane back 1920s Bill edifies us after 30 years Air Corps/Air Force another 10 years doingthings government heart problem came back modeling After building Sig Kadet bitten RC bug since have built several airplanes mostly scratch Being too old hands knees bit fueling starting airplanes put folding legs huge field box raise level permitted work standing position course field box/stand weighed much took two us move After building some plant stands PVC plastic pipe wife realized could have light field stand could handle easily comfort several months now have using stand shown enclosed photographs Built 1-in PVC pipe consists two ends two shelves supports airplane fastened ends bolts wing nuts permitting quicikly change fit different fuselages padding fuselage supports insulation sold PVC pipes 1 22 Model Aviation Plane Talk/Winter Continued page 37 two shelves simply two straight pipes held together sheet hardboard shelves ends joined spring clips shown pictures whole thing disassembles quickly fit car trunks room spare usually leave assembled carry airplane van Once decided sizes wanted figured out parts list construction took less hour expenditure less $10 field stand doubles great work stand shop stand problem solved turned problem equipment carried old field box Using scrap plywood built three boxes fueling box carries half-gallon plastic fuel tank 12-volt battery electric fuel pump starter box includes 12-volt battery power panel storage space glow plugs small tools electric starter tool box has drawer small tools parts storage compartments spare propellers larger tools equip ment cleaning equipment other essential items seldom needed put cleats ends bottom box fit over shelves keep boxes vibrating off shelf boxes quite light easily handled two 12-volt batteries provide back up prevent loss flying session forget charge Add folding chair jug coffee iced tea depending upon tempera ture have makings com fortable enjoyable flying session know youngsters will sneer such sissy stuff thought would pass along whatever worth hope will interest some other old-timers senior citizens seem coming RC hobby simplifi cation equipment might ensure sustained interest pleasant flying field conditions Thus spake Bill Greenhalgh Wetump ka AL Favor requested Will something cause close heart February 1986 ModelAirplane News Hal deBolt began new long-needed feature Golden Age RC has making long time us have put heads together help make possible always wanted self colunm specifically RC have interest Antique OldTimer modeling SAM Society Antique Modelers makes go Thats primarily based old Free Flight models RC-assist involved interest Old-Timer Control Line models obvious potential RC its own right has neglecteduntil now know 1950s 6-ft 35powered Smog Hog example does anything can Saturday Night Specialexcept go straight up Its easier safer fly things flown now came low-wing Smog Hog Sig Mfg Co perceived Kasmirski 45-powered Orion 1960 Aero batics World Champion still matches performance modern engine anything can think hot aerobatic airplane hundreds published once-kitted wonderful air planesdeltas canards name Ob viously an Antique era OldTimer era Nostalgic erastarting things like Goods Big Guff prewar days Taurus Orion 1960 Buzzard Bombshells could promote competitions aware majority will prefer simply enjoy flying historic planes Please contribute Hals column us hundreds pictures out Send background info Harold deBolt 2206 Greenwich Dr Kings Pt Sun City Center FL 33570 Without contributions column like deBolts cannot continued indefi nitely Photographic examples particular needed Falcon OldTimer dating late SOs Beams Esquires H-Rays Berkeleys Hollinger J 3 Fairchild PT on Walt Goods series history Radio Control began last month Chet Lanzo has asked help major presentation 1934 RC-1 prehistoric radio gear People keep building Krackerjac Rookie designers have same experience Beyond historic stuff now appearing magazine no continuity except deBolts Golden Age thing requires everyone interested assure prospers pictures good information Mining gold depends have gratitude joining effort Before long youll have yourself thank having bothered Bill Winter 4432 Altura Ct Fajifax VA 22030 Radio Technique/Myers Continued page 38 buy products object will likely accompanied warning literature manufacturer will receptive constructive criticism object being sold lacks such obvious liability/litigation potential manufacturers interest usually concen trates itself price profit performed static structural load test airplanes towhook/fuselage/wing combination Jugs water provided test load pint water weighs pound Note done before wing covered wing should depend covering strength sides something cracks want see well hear wing spar strong enough Only dowel needed changed Continued page 126 April 1986 123 C C El I m z 0 z z C 0 0 m I m 0 q 0 CD C 0 0 C -4 0 CD 0 Co U 0 -L N 0 0 01 x x N
Edition: Model Aviation - 1986/04
Page Numbers: 14, 16, 18, 20, 122, 123
___John Preston___________________________ Safety Comes First weighted blades RC Heli copters safety hints propel lers legal RC frequencies prob lem surfaces again eliminating flutter buzz CORRECTION I recently received let ter Glenn Scillian concerning report accident flying RC Helicopter reported column January 1986 issue Model Aviation seems report accident completely wrong may disservice RC Helicopter builders fliers previous report stated Glenn struck leg unweighted rotor blade thrown off models Glenn states let ter struck one-ounce lead weight come loose rotor blades letter Glenn enclosed copy letter wrote November 1984 Larry Jolly described accident dont believe Larry ever reported incident RC Helicopters column set record straight Im going use Glenns own words describe what really happened also apologize wrong account January issue summer 1983 suffered serious accident struck lead weight blade Heli copter found added ounce lead shape disk about inch diameter about A-inch thick blade model flew beau tifullymuch better unweight ed blades As far can recall blades never touched ground tall boom slugs epoxied cavity about three inches outside end blade cavity half hardwood half balsa grant long slender slug nesting en tirely hardwood would have safer disk shape recommended manufacturer use its Helicopters day revving engine up Helicopter sitting OR 004 ON Li Reader David Lewis suggests Iactoryappiied stickers RC transmitters system boxes such could help salespersons hobby shops sell legal radios novice RC hobbyists Preston discusses problem column ground about 12 feet front tail toward Just moment lift-off slug chunk wood blade let go struck right shin two inches below kneecap knocked down still held transmitter shut throttle down now-unbalanced copter thrashed violently ground literally tore off tail boom friend finally stopped blades pulled off fuel line Other friends applied some clean towels wound bleeding moderately drain ing bone-marrow oil driven nearest hospital about five miles away treated outpatient Exami Continued page 16 t II I5 ITS O5VIOLALY FRLAENCY AIkCY-AET cLY 14 Model Aviation UNIVERSAL IN-COWL AIRCRAFT MUFFLERS 19-4045-6075-13 engines UPSIONT ox INVICIED ENOINE Jt-40119-401600 JI-OGi45-901700 11-90175-131900 TTLAS0577 0T0530le0705e0 DUN tSmee 0e5 soc OATS 757 bA 7550 77 5577 504 Most versatile mufflers ever offered Designed fit inside cowls lImited soace can also used HELICOPTERS BOATS 0 For UPRIGHT INVERTED SIDE mounted engines 0 Exhaust tubes point almost direction S Worm drive clamp universal mounting can bolted directly engine BASIC DIMENSIONS INCLUDES Exhaust pipe extensions clamps553003737003007370700 worm drive clomp muffler alignment 0i plate gasket mounting screws S nOt 3073~IC 9031 hObby shop ORDER DIRECT tar rxnedote s9ment Check MO Visa MC COD accepted Add S260 tar UPS S200 tar COD 6% IcieR tax tar Cdt resident RETRACTABLE OW HOOK RELEASE Price SS90 Simplest reliable device available After line released hook retracts body unit leaving SMOOTH surface bottom aircraft No special attachments required N eight Y5 oz OTHER FOURMOST PRODUCTS 03C [5 ZAO[SW[TZ[5-] a S 164 School St Daly CIty CA 94014 415 756-3400 049/051 AIRFLO ENGINE MOUNT REDUCES DRAG VIBRATION FREE PRICE $300 40 AIRFLO ENGINE MOUNT IDEAL FOR QUICKY 500 PRICE $630 Fuel Fitting Sets Fuel Shut Off Fuel Manifold Gapless Hinges Gapless Hinge Slotter Strut Fairings Cockpit Coaming nation showed chipped tibia fortu nately no damage patella ligament wear soft cast about three weeks healing complete four five weeks Before returned flying weighted blades dis carded replaced Jeff Urcan s heavy blades As far can see fly well lead-weighted blades Glenns letter described another inci dent friend hovering Helicopter about eye level lead weight blades let go case nobody struck flying weight damage Helicopter due its unbalanced main rotor blades Before leaving subject let re mind readers emergency competi tion rule published September 1984 issue Model Aviation out lawed metal blades knife-edged leading edges blades metal blades beyond point two inches blade root attachment point emer gency rule enacted under AMA con test board procedures permit AMA president concurrence appropriate Contest Board chairman take emergency action dictated situation However make such emergency rules change permanent must ratified vote entire Contest Board must take place tween four six weeks after publication emergency rules change mem bers Helicopter Contest Board voted against rule concerning Helicopter blades So weighted blades still permitted AMA-sanctioned Helicopter contests Note however FAI rules RC Helicopters page 106 1986-87 rule book per mit metal blades metal weights blades knife-like leading edges blades PropellersIt seems appropriate switch potential hazard Heli copter blades presented blades propellers fixed-wing models Two readers contacted during last month phone letter subject blade separation propellers phone call Paul Geders St Louis MO inquire whether particular type non-wood prop involved significantly blade-shedding incidents other types Apparently fellow club members wanted outlaw use prop based incident damaged blade let go combed cor respondence records concerning prop cidents didnt really find enough documented incidents make statis tically-valid conclusions However found interesting appeared incidents blades separating wooden props plastic props Please regard statement Continued page 18 16 Model Aviation UPWCCTIIDVINVfITRORORSRROSIOI lee 434057770073 5311 CATAIfl Winning Ideas FOURMOST nd SASE Complete Information Ave Forest Grove OR 97116 PRODUCTS Phone 503 357-2732 4 vOl ec &cP C Al A0S oBB~ sendOR -cl meaning plastic props safer wood props Id rather aware blades may separate prop no matter what material fabricated letter concerning props came AE Richt Scott Depot WV en closed instructions received some Graupner Super fiberglassreinforced nylon props purchased major mail order hobby retailer instructions entirely German appeared contain some warning statements would-be users AE stated German far goodbut apparently better since able decipher care should taken ensure props dry-out Periodic boiling storing wet rag appeared recommended second warning appeared state prop tip velocity should ex ceed 180 meters/second AE supplied following table listing maximum rpm various prop diameters will exceed 180 in/sec tip speed Prop DI S 6 7 8 9 9 l0 lOS II 12 125 13 14 15 Max RPM 27000 22500 19300 16900 15000 14200 13500 12800 12300 11200 10800 10400 9600 9000 have sent Graupner prop instruc tions German-born engineer friend request translation thing else importance pops up translation Ill include next Safe ty column Meanwhile time gets print should have translated instructions will forward reader sending SASE address end column Which frequency model let ter arrived just day too late included last months Safety column contained very simple remedy mix-up can occur hobby store owner either knowingly unknowingly sells radio aircraft-only fre quency customer plans use boat car think major hobby retailers aware fact aircraft-only boat/car-only RC frequencies However follow ing letter David Lewis points out may some sources radios sales personnel aware fact have Navy last five years am now serving aboard Continued page 20 18 Model Aviation Spec al Detergents help prevent yarn sh p omo e c ean burning Rust Preventatives protect expens ye eng nes f om corrosion SIG CHAMPION 2 STROKE FUEL FREIGHT FREE sHIPPING ON ORDERS OVER $1500COLLECT PINTQUARTGALLON55 GAL DRUM 0N omethane$315$450$1050 00 5Ntromethane$365$525$1250 00 10%Ntrornethane$415$550$1450 00 15%Nitromethane$430$625$1650 00 25%Nitrornethane$495$750$2095 00 35%Ntromethane$575$875$2495 00 SIGPREMIUM4-STROKE FUEL 10%Nltromethane$415$550$1395 00 15%Nitrornethane$425$625$1595 00 THE CHOICE OF CHAMPION FLYERS Fr ars 510 has blending fuel finest qual ty ingrec e arie alcuha 99 - ery best grade available nitromethaxe use 1i ira get hunest r volume tar maximum lubrication get eb[end ot Bakers AA Cara K sty Tecvniplate Racing Oil protect expensive erg rs r try tivest qual ty t xl tva -av re avy price Dant tube wurd tor try vome cry ciurse[ti See dealer first available order direct Call 247-5008 toll free orders Latest Catalog $300 ~- SIG MANUFACTURING CO Montezuma IA 50171 xervnvire DYNATHRUST PROPS look great too! ALL FUTURE PRODUCTION ON ALL SIZES WILL HAVE LOGO AND TIPS PAINTED SIZES CURRENTLY AVAILABLE 13x6 15x6 8 $700 18x6 810 $1000 22x8 10- $1800 14x6 16x6 8 20x6 810 0 AddlSlzesAvailable Soon 2541 NE 11th Court ano Beach Florida 33062 e 13051 941-9119 AVAILABLE FROM LEADING DEALERS AND DISTRUBUTORS DIRECT CYANOACRYLATE CIAL INTROOUCTORY OFFER ListSaleSavings 1 oz Fast Cure 3-5 Sec$2500/0 Off 2 oz Fast Cure 3-5 Sec895$39656% Off 1 oz Gap-Filling 5 Sec495$2450% Off 2 oz Gap-Filling 5 Sec895$39656% Off OUR GUARANTEE TO YOU satisfied POSI-CURE please return unused portion within 30 days full refundNo questions asked SHELDONS HOBBY SHOP 3157 Alum Rock Ave Jose CA 95127r FOR ORDERS ONLY PLEASE 800 228-32370408 251-0789 Out State INFO 408 251-0787 California Hours Mon-Wed Fri & Sat 930-530 Thin 930-900 1200-500 destroyer USS Hoel travels have seen recurring problem Navy Exchange almost Navy base Ive visited will sell radio frequency anyone anything want done because no clear ID car boat aircraft use radio Sales personnel involved RC hobby dont realize what can lead said something about November Model Aviation Ill bet Navy aint ones letting happen So mark radios factory could save lot trouble maybe some airplanes such label See elsewhere columnJP anyone could figure out radio goes model selling prod uct whether involved hobby first read Davids letter struck suggestion ID label radio car/boat aircraftonly simple straightforward wondered nobody previ ously suggested Maybe has pre viously suggested rejected because reason another Obviously mark ing transmitter its use because its frequency will work transmitter frequency cannot changed However feature interchangeable RF module module itself could bear label indicating aircraft-only boat car-only use seems likely future will increasing number multi-frequency radios such currently-available Kraft Channel-Max synthesizes available RC frequencies Since AMA recommends displaying proper flag channel identification both contest sport flying manufacturers flags channel markers could include label indicating type use aircraft boat/car last months Safety column topic discussion should informative uniform instruc tions accompanying RC equipment seems radio systems should contain instructions lists frequencies designated aircraft boat/car look page 129 current 1986-87 AMA rule book states USE OF RADIO TUNED TO AIR CRAFT-ONLY FREQUENCY IN CAR OR BOAT IS AGAINST THE LAW case didnt already know law statement refers FCC regulation intend pass David Lewis sugges tion use-identification label AMA Safety Frequency Committees consideration note Dave Brown AMA District III VP member Safety Committee VP col umn February 1986 issue reports Frequency Committee meeting Continued page 122 20 Model Aviation F L IpJw per oruer FAST SERVICE COD ADD $190 POWERED MODELS Quality ormance ndability 1AA Control Line Airplanes Engines Accessories R/C Sailplanes Airplanes R/C Off-Road Cars SEND BASE FOR FREE MINI CATALOG COX HOBBIES INC 1525 E Warner Ave Santa Ana CA 92705 ATTENTION 1/4 SCALERS EPOXY GLASS COWLS FOR NOSEN PICA SID MORGAN BALSA USA PLATi CONCEPT FLEET HOSTETLER ACM T-CRAPT SHEBER PITTS N V SCALE SUPER CUB POKKER D-7 BOEING P12 P26 F4B2 F4B4 SPARROW HAWK GEE BEE MOD Y MACBAlERS TURBULENT CHRISTEN EAGLE BRISIGHELLAS STARDUSTER II SCALE J3-Bl BABY FLYBABY N OTHERS WHEEL PANTS FOR CITABRIA STARGUSTER II PEflS SKYBOLT LIBERTY SPORT CHRISTEN EAGLE PEE HAWK MULLIGAN N OTHERS LARGE SCALE PLANS AVAILABLE Please send $100 complete list supply ModelerS fiberglass parts plans Write Call us T & D FIBERGLASS SPECIALTIES 3B92B BLOCK GARDEN CITY MI 4B13B PHONE 3131421-6358 BRAZED & HEATTREATEO WIRE GEARS N cABANES PHONE 13131261-9064 PILOTS TS RIOR TS T THE MOST SUPERIOR PILOT FIGURE ON THE MARKET LIGHTEST WEIGHT MOST REALISTIC AVAILABLE GIVE YOUR PLANE PILOT FOR YOUR NEWEST OLDEST OR NEXT CREATION R YOURS TODAY FULL FIGURES CIVILIANWWII MILITARY 1/3 Scale $19951/5 Navy $1395 1/4 Scale14951/6AAF1195 1 /5 Scale1295 Plus 1/12 Scale895$250 shipping 1/12 Chopper 895each figure KNIGHTS OF THE AIR 1400 Rte 22 West Friendship MD 21794 301-489-5050 Letters Editor Continued page 12 compiling error having gone undetected long quantity E1115/61 usually much smaller quantity L*S2/Sl As such little error pro duced used probably noticed attributed geometric variations actual model Mr Donatelli found error may have used design di mensions producing severe imbab ance So Line 760 should read PL*S2/SlE1/15/Gl apologies error must lot modelers out computers already getting mail about article Design Analysis Program Dick Sarpolus Shrewsbury NJ Safety Preston Continued page 20 stated experiencing prob lems some parts country RC cars buggies using frequencies reserved aircraft. Perhaps Davids label suggestion can help alleviate some problems FlutterAnother item mentioned last months Safety column suggestion modeler should man datory checks models prevent con trol surface flutter November 1985 issue Corsair newsletter Joint Military R/G Fliers Club editor Marlin Kinning article flutter written noted modeler Cliff Weirick benefit readers may know what flutter can model Im reproducing Cliffs article FLUTTER Most know what seem some fliers dontor dont care break flutter down two levels full blown FLUTTER very destructive force second BUZZ Buzz too very destructive force slightly dif ferent way Lets look FLUTTER first can destroy airplane quicker can blink eye can attack sur face plane its prime targets ailerons followed closely elevator rudder flutter starts matter time until surface itself leaves plane takes sur face attached case two wings elevator counts up three airplanes stunt job wing failure next two Formula Ones Another aileron wing other elevator Actu ally very famousor should say infamouscrash lot oldtimers will remember Nats Los Alamitos NAS Boy what mess Now know what flutter can lets think about BUZZ hard describe because cant hear power model unless engine dead can hear flutter loud est engines whining away Buzz tends destroy servosand ultimately plane tends ruin gears worse yet attacks feedback pot ser vo does wearing small area usually around level-flight neutral position happens wonder sometimes controls may act funny What causes buzz Primarily two things Loose control surfaces sloppy tail-heavy loose sloppy pushrods etc see control surfaces look ready fall off airplane yet pilots ignore Same way pushrods Some builders drill %2-in holes control horn use 46-in wire Thats really asking sum up check things time go out fly remem ber tight will wear out get loose Have safe moath John Preston 12235 Tildenwood Dr Rockville MD 20852 responding advertisers mention read aboutthem ModelAviation drivers fuel pumps rolled aisles over power panels gallon fuel cans transmitter tray must got hand-held units Field boxes heavy wacky high-techand prop can cost seven bucks about power panel under nose run engines fancy hinged lids prevent getting anything plane figure top wedding cake ends up ground crawling aroundeasier get ting up down like jive puppet Im back knees now cant get up Legs no legs question Bill H Greenhalgh man after own heart dont have ambition brains too suffering herd guy lives place called Wetumpka Alabama must have right stuff am another old coot Au Good name next modeL built first model airplane back 1920s Bill edifies us after 30 years Air Corps/Air Force another 10 years doingthings government heart problem came back modeling After building Sig Kadet bitten RC bug since have built several airplanes mostly scratch Being too old hands knees bit fueling starting airplanes put folding legs huge field box raise level permitted work standing position course field box/stand weighed much took two us move After building some plant stands PVC plastic pipe wife realized could have light field stand could handle easily comfort several months now have using stand shown enclosed photographs Built 1-in PVC pipe consists two ends two shelves supports airplane fastened ends bolts wing nuts permitting quicikly change fit different fuselages padding fuselage supports insulation sold PVC pipes 1 22 Model Aviation Plane Talk/Winter Continued page 37 two shelves simply two straight pipes held together sheet hardboard shelves ends joined spring clips shown pictures whole thing disassembles quickly fit car trunks room spare usually leave assembled carry airplane van Once decided sizes wanted figured out parts list construction took less hour expenditure less $10 field stand doubles great work stand shop stand problem solved turned problem equipment carried old field box Using scrap plywood built three boxes fueling box carries half-gallon plastic fuel tank 12-volt battery electric fuel pump starter box includes 12-volt battery power panel storage space glow plugs small tools electric starter tool box has drawer small tools parts storage compartments spare propellers larger tools equip ment cleaning equipment other essential items seldom needed put cleats ends bottom box fit over shelves keep boxes vibrating off shelf boxes quite light easily handled two 12-volt batteries provide back up prevent loss flying session forget charge Add folding chair jug coffee iced tea depending upon tempera ture have makings com fortable enjoyable flying session know youngsters will sneer such sissy stuff thought would pass along whatever worth hope will interest some other old-timers senior citizens seem coming RC hobby simplifi cation equipment might ensure sustained interest pleasant flying field conditions Thus spake Bill Greenhalgh Wetump ka AL Favor requested Will something cause close heart February 1986 ModelAirplane News Hal deBolt began new long-needed feature Golden Age RC has making long time us have put heads together help make possible always wanted self colunm specifically RC have interest Antique OldTimer modeling SAM Society Antique Modelers makes go Thats primarily based old Free Flight models RC-assist involved interest Old-Timer Control Line models obvious potential RC its own right has neglecteduntil now know 1950s 6-ft 35powered Smog Hog example does anything can Saturday Night Specialexcept go straight up Its easier safer fly things flown now came low-wing Smog Hog Sig Mfg Co perceived Kasmirski 45-powered Orion 1960 Aero batics World Champion still matches performance modern engine anything can think hot aerobatic airplane hundreds published once-kitted wonderful air planesdeltas canards name Ob viously an Antique era OldTimer era Nostalgic erastarting things like Goods Big Guff prewar days Taurus Orion 1960 Buzzard Bombshells could promote competitions aware majority will prefer simply enjoy flying historic planes Please contribute Hals column us hundreds pictures out Send background info Harold deBolt 2206 Greenwich Dr Kings Pt Sun City Center FL 33570 Without contributions column like deBolts cannot continued indefi nitely Photographic examples particular needed Falcon OldTimer dating late SOs Beams Esquires H-Rays Berkeleys Hollinger J 3 Fairchild PT on Walt Goods series history Radio Control began last month Chet Lanzo has asked help major presentation 1934 RC-1 prehistoric radio gear People keep building Krackerjac Rookie designers have same experience Beyond historic stuff now appearing magazine no continuity except deBolts Golden Age thing requires everyone interested assure prospers pictures good information Mining gold depends have gratitude joining effort Before long youll have yourself thank having bothered Bill Winter 4432 Altura Ct Fajifax VA 22030 Radio Technique/Myers Continued page 38 buy products object will likely accompanied warning literature manufacturer will receptive constructive criticism object being sold lacks such obvious liability/litigation potential manufacturers interest usually concen trates itself price profit performed static structural load test airplanes towhook/fuselage/wing combination Jugs water provided test load pint water weighs pound Note done before wing covered wing should depend covering strength sides something cracks want see well hear wing spar strong enough Only dowel needed changed Continued page 126 April 1986 123 C C El I m z 0 z z C 0 0 m I m 0 q 0 CD C 0 0 C -4 0 CD 0 Co U 0 -L N 0 0 01 x x N
Edition: Model Aviation - 1986/04
Page Numbers: 14, 16, 18, 20, 122, 123
___John Preston___________________________ Safety Comes First weighted blades RC Heli copters safety hints propel lers legal RC frequencies prob lem surfaces again eliminating flutter buzz CORRECTION I recently received let ter Glenn Scillian concerning report accident flying RC Helicopter reported column January 1986 issue Model Aviation seems report accident completely wrong may disservice RC Helicopter builders fliers previous report stated Glenn struck leg unweighted rotor blade thrown off models Glenn states let ter struck one-ounce lead weight come loose rotor blades letter Glenn enclosed copy letter wrote November 1984 Larry Jolly described accident dont believe Larry ever reported incident RC Helicopters column set record straight Im going use Glenns own words describe what really happened also apologize wrong account January issue summer 1983 suffered serious accident struck lead weight blade Heli copter found added ounce lead shape disk about inch diameter about A-inch thick blade model flew beau tifullymuch better unweight ed blades As far can recall blades never touched ground tall boom slugs epoxied cavity about three inches outside end blade cavity half hardwood half balsa grant long slender slug nesting en tirely hardwood would have safer disk shape recommended manufacturer use its Helicopters day revving engine up Helicopter sitting OR 004 ON Li Reader David Lewis suggests Iactoryappiied stickers RC transmitters system boxes such could help salespersons hobby shops sell legal radios novice RC hobbyists Preston discusses problem column ground about 12 feet front tail toward Just moment lift-off slug chunk wood blade let go struck right shin two inches below kneecap knocked down still held transmitter shut throttle down now-unbalanced copter thrashed violently ground literally tore off tail boom friend finally stopped blades pulled off fuel line Other friends applied some clean towels wound bleeding moderately drain ing bone-marrow oil driven nearest hospital about five miles away treated outpatient Exami Continued page 16 t II I5 ITS O5VIOLALY FRLAENCY AIkCY-AET cLY 14 Model Aviation UNIVERSAL IN-COWL AIRCRAFT MUFFLERS 19-4045-6075-13 engines UPSIONT ox INVICIED ENOINE Jt-40119-401600 JI-OGi45-901700 11-90175-131900 TTLAS0577 0T0530le0705e0 DUN tSmee 0e5 soc OATS 757 bA 7550 77 5577 504 Most versatile mufflers ever offered Designed fit inside cowls lImited soace can also used HELICOPTERS BOATS 0 For UPRIGHT INVERTED SIDE mounted engines 0 Exhaust tubes point almost direction S Worm drive clamp universal mounting can bolted directly engine BASIC DIMENSIONS INCLUDES Exhaust pipe extensions clamps553003737003007370700 worm drive clomp muffler alignment 0i plate gasket mounting screws S nOt 3073~IC 9031 hObby shop ORDER DIRECT tar rxnedote s9ment Check MO Visa MC COD accepted Add S260 tar UPS S200 tar COD 6% IcieR tax tar Cdt resident RETRACTABLE OW HOOK RELEASE Price SS90 Simplest reliable device available After line released hook retracts body unit leaving SMOOTH surface bottom aircraft No special attachments required N eight Y5 oz OTHER FOURMOST PRODUCTS 03C [5 ZAO[SW[TZ[5-] a S 164 School St Daly CIty CA 94014 415 756-3400 049/051 AIRFLO ENGINE MOUNT REDUCES DRAG VIBRATION FREE PRICE $300 40 AIRFLO ENGINE MOUNT IDEAL FOR QUICKY 500 PRICE $630 Fuel Fitting Sets Fuel Shut Off Fuel Manifold Gapless Hinges Gapless Hinge Slotter Strut Fairings Cockpit Coaming nation showed chipped tibia fortu nately no damage patella ligament wear soft cast about three weeks healing complete four five weeks Before returned flying weighted blades dis carded replaced Jeff Urcan s heavy blades As far can see fly well lead-weighted blades Glenns letter described another inci dent friend hovering Helicopter about eye level lead weight blades let go case nobody struck flying weight damage Helicopter due its unbalanced main rotor blades Before leaving subject let re mind readers emergency competi tion rule published September 1984 issue Model Aviation out lawed metal blades knife-edged leading edges blades metal blades beyond point two inches blade root attachment point emer gency rule enacted under AMA con test board procedures permit AMA president concurrence appropriate Contest Board chairman take emergency action dictated situation However make such emergency rules change permanent must ratified vote entire Contest Board must take place tween four six weeks after publication emergency rules change mem bers Helicopter Contest Board voted against rule concerning Helicopter blades So weighted blades still permitted AMA-sanctioned Helicopter contests Note however FAI rules RC Helicopters page 106 1986-87 rule book per mit metal blades metal weights blades knife-like leading edges blades PropellersIt seems appropriate switch potential hazard Heli copter blades presented blades propellers fixed-wing models Two readers contacted during last month phone letter subject blade separation propellers phone call Paul Geders St Louis MO inquire whether particular type non-wood prop involved significantly blade-shedding incidents other types Apparently fellow club members wanted outlaw use prop based incident damaged blade let go combed cor respondence records concerning prop cidents didnt really find enough documented incidents make statis tically-valid conclusions However found interesting appeared incidents blades separating wooden props plastic props Please regard statement Continued page 18 16 Model Aviation UPWCCTIIDVINVfITRORORSRROSIOI lee 434057770073 5311 CATAIfl Winning Ideas FOURMOST nd SASE Complete Information Ave Forest Grove OR 97116 PRODUCTS Phone 503 357-2732 4 vOl ec &cP C Al A0S oBB~ sendOR -cl meaning plastic props safer wood props Id rather aware blades may separate prop no matter what material fabricated letter concerning props came AE Richt Scott Depot WV en closed instructions received some Graupner Super fiberglassreinforced nylon props purchased major mail order hobby retailer instructions entirely German appeared contain some warning statements would-be users AE stated German far goodbut apparently better since able decipher care should taken ensure props dry-out Periodic boiling storing wet rag appeared recommended second warning appeared state prop tip velocity should ex ceed 180 meters/second AE supplied following table listing maximum rpm various prop diameters will exceed 180 in/sec tip speed Prop DI S 6 7 8 9 9 l0 lOS II 12 125 13 14 15 Max RPM 27000 22500 19300 16900 15000 14200 13500 12800 12300 11200 10800 10400 9600 9000 have sent Graupner prop instruc tions German-born engineer friend request translation thing else importance pops up translation Ill include next Safe ty column Meanwhile time gets print should have translated instructions will forward reader sending SASE address end column Which frequency model let ter arrived just day too late included last months Safety column contained very simple remedy mix-up can occur hobby store owner either knowingly unknowingly sells radio aircraft-only fre quency customer plans use boat car think major hobby retailers aware fact aircraft-only boat/car-only RC frequencies However follow ing letter David Lewis points out may some sources radios sales personnel aware fact have Navy last five years am now serving aboard Continued page 20 18 Model Aviation Spec al Detergents help prevent yarn sh p omo e c ean burning Rust Preventatives protect expens ye eng nes f om corrosion SIG CHAMPION 2 STROKE FUEL FREIGHT FREE sHIPPING ON ORDERS OVER $1500COLLECT PINTQUARTGALLON55 GAL DRUM 0N omethane$315$450$1050 00 5Ntromethane$365$525$1250 00 10%Ntrornethane$415$550$1450 00 15%Nitromethane$430$625$1650 00 25%Nitrornethane$495$750$2095 00 35%Ntromethane$575$875$2495 00 SIGPREMIUM4-STROKE FUEL 10%Nltromethane$415$550$1395 00 15%Nitrornethane$425$625$1595 00 THE CHOICE OF CHAMPION FLYERS Fr ars 510 has blending fuel finest qual ty ingrec e arie alcuha 99 - ery best grade available nitromethaxe use 1i ira get hunest r volume tar maximum lubrication get eb[end ot Bakers AA Cara K sty Tecvniplate Racing Oil protect expensive erg rs r try tivest qual ty t xl tva -av re avy price Dant tube wurd tor try vome cry ciurse[ti See dealer first available order direct Call 247-5008 toll free orders Latest Catalog $300 ~- SIG MANUFACTURING CO Montezuma IA 50171 xervnvire DYNATHRUST PROPS look great too! ALL FUTURE PRODUCTION ON ALL SIZES WILL HAVE LOGO AND TIPS PAINTED SIZES CURRENTLY AVAILABLE 13x6 15x6 8 $700 18x6 810 $1000 22x8 10- $1800 14x6 16x6 8 20x6 810 0 AddlSlzesAvailable Soon 2541 NE 11th Court ano Beach Florida 33062 e 13051 941-9119 AVAILABLE FROM LEADING DEALERS AND DISTRUBUTORS DIRECT CYANOACRYLATE CIAL INTROOUCTORY OFFER ListSaleSavings 1 oz Fast Cure 3-5 Sec$2500/0 Off 2 oz Fast Cure 3-5 Sec895$39656% Off 1 oz Gap-Filling 5 Sec495$2450% Off 2 oz Gap-Filling 5 Sec895$39656% Off OUR GUARANTEE TO YOU satisfied POSI-CURE please return unused portion within 30 days full refundNo questions asked SHELDONS HOBBY SHOP 3157 Alum Rock Ave Jose CA 95127r FOR ORDERS ONLY PLEASE 800 228-32370408 251-0789 Out State INFO 408 251-0787 California Hours Mon-Wed Fri & Sat 930-530 Thin 930-900 1200-500 destroyer USS Hoel travels have seen recurring problem Navy Exchange almost Navy base Ive visited will sell radio frequency anyone anything want done because no clear ID car boat aircraft use radio Sales personnel involved RC hobby dont realize what can lead said something about November Model Aviation Ill bet Navy aint ones letting happen So mark radios factory could save lot trouble maybe some airplanes such label See elsewhere columnJP anyone could figure out radio goes model selling prod uct whether involved hobby first read Davids letter struck suggestion ID label radio car/boat aircraftonly simple straightforward wondered nobody previ ously suggested Maybe has pre viously suggested rejected because reason another Obviously mark ing transmitter its use because its frequency will work transmitter frequency cannot changed However feature interchangeable RF module module itself could bear label indicating aircraft-only boat car-only use seems likely future will increasing number multi-frequency radios such currently-available Kraft Channel-Max synthesizes available RC frequencies Since AMA recommends displaying proper flag channel identification both contest sport flying manufacturers flags channel markers could include label indicating type use aircraft boat/car last months Safety column topic discussion should informative uniform instruc tions accompanying RC equipment seems radio systems should contain instructions lists frequencies designated aircraft boat/car look page 129 current 1986-87 AMA rule book states USE OF RADIO TUNED TO AIR CRAFT-ONLY FREQUENCY IN CAR OR BOAT IS AGAINST THE LAW case didnt already know law statement refers FCC regulation intend pass David Lewis sugges tion use-identification label AMA Safety Frequency Committees consideration note Dave Brown AMA District III VP member Safety Committee VP col umn February 1986 issue reports Frequency Committee meeting Continued page 122 20 Model Aviation F L IpJw per oruer FAST SERVICE COD ADD $190 POWERED MODELS Quality ormance ndability 1AA Control Line Airplanes Engines Accessories R/C Sailplanes Airplanes R/C Off-Road Cars SEND BASE FOR FREE MINI CATALOG COX HOBBIES INC 1525 E Warner Ave Santa Ana CA 92705 ATTENTION 1/4 SCALERS EPOXY GLASS COWLS FOR NOSEN PICA SID MORGAN BALSA USA PLATi CONCEPT FLEET HOSTETLER ACM T-CRAPT SHEBER PITTS N V SCALE SUPER CUB POKKER D-7 BOEING P12 P26 F4B2 F4B4 SPARROW HAWK GEE BEE MOD Y MACBAlERS TURBULENT CHRISTEN EAGLE BRISIGHELLAS STARDUSTER II SCALE J3-Bl BABY FLYBABY N OTHERS WHEEL PANTS FOR CITABRIA STARGUSTER II PEflS SKYBOLT LIBERTY SPORT CHRISTEN EAGLE PEE HAWK MULLIGAN N OTHERS LARGE SCALE PLANS AVAILABLE Please send $100 complete list supply ModelerS fiberglass parts plans Write Call us T & D FIBERGLASS SPECIALTIES 3B92B BLOCK GARDEN CITY MI 4B13B PHONE 3131421-6358 BRAZED & HEATTREATEO WIRE GEARS N cABANES PHONE 13131261-9064 PILOTS TS RIOR TS T THE MOST SUPERIOR PILOT FIGURE ON THE MARKET LIGHTEST WEIGHT MOST REALISTIC AVAILABLE GIVE YOUR PLANE PILOT FOR YOUR NEWEST OLDEST OR NEXT CREATION R YOURS TODAY FULL FIGURES CIVILIANWWII MILITARY 1/3 Scale $19951/5 Navy $1395 1/4 Scale14951/6AAF1195 1 /5 Scale1295 Plus 1/12 Scale895$250 shipping 1/12 Chopper 895each figure KNIGHTS OF THE AIR 1400 Rte 22 West Friendship MD 21794 301-489-5050 Letters Editor Continued page 12 compiling error having gone undetected long quantity E1115/61 usually much smaller quantity L*S2/Sl As such little error pro duced used probably noticed attributed geometric variations actual model Mr Donatelli found error may have used design di mensions producing severe imbab ance So Line 760 should read PL*S2/SlE1/15/Gl apologies error must lot modelers out computers already getting mail about article Design Analysis Program Dick Sarpolus Shrewsbury NJ Safety Preston Continued page 20 stated experiencing prob lems some parts country RC cars buggies using frequencies reserved aircraft. Perhaps Davids label suggestion can help alleviate some problems FlutterAnother item mentioned last months Safety column suggestion modeler should man datory checks models prevent con trol surface flutter November 1985 issue Corsair newsletter Joint Military R/G Fliers Club editor Marlin Kinning article flutter written noted modeler Cliff Weirick benefit readers may know what flutter can model Im reproducing Cliffs article FLUTTER Most know what seem some fliers dontor dont care break flutter down two levels full blown FLUTTER very destructive force second BUZZ Buzz too very destructive force slightly dif ferent way Lets look FLUTTER first can destroy airplane quicker can blink eye can attack sur face plane its prime targets ailerons followed closely elevator rudder flutter starts matter time until surface itself leaves plane takes sur face attached case two wings elevator counts up three airplanes stunt job wing failure next two Formula Ones Another aileron wing other elevator Actu ally very famousor should say infamouscrash lot oldtimers will remember Nats Los Alamitos NAS Boy what mess Now know what flutter can lets think about BUZZ hard describe because cant hear power model unless engine dead can hear flutter loud est engines whining away Buzz tends destroy servosand ultimately plane tends ruin gears worse yet attacks feedback pot ser vo does wearing small area usually around level-flight neutral position happens wonder sometimes controls may act funny What causes buzz Primarily two things Loose control surfaces sloppy tail-heavy loose sloppy pushrods etc see control surfaces look ready fall off airplane yet pilots ignore Same way pushrods Some builders drill %2-in holes control horn use 46-in wire Thats really asking sum up check things time go out fly remem ber tight will wear out get loose Have safe moath John Preston 12235 Tildenwood Dr Rockville MD 20852 responding advertisers mention read aboutthem ModelAviation drivers fuel pumps rolled aisles over power panels gallon fuel cans transmitter tray must got hand-held units Field boxes heavy wacky high-techand prop can cost seven bucks about power panel under nose run engines fancy hinged lids prevent getting anything plane figure top wedding cake ends up ground crawling aroundeasier get ting up down like jive puppet Im back knees now cant get up Legs no legs question Bill H Greenhalgh man after own heart dont have ambition brains too suffering herd guy lives place called Wetumpka Alabama must have right stuff am another old coot Au Good name next modeL built first model airplane back 1920s Bill edifies us after 30 years Air Corps/Air Force another 10 years doingthings government heart problem came back modeling After building Sig Kadet bitten RC bug since have built several airplanes mostly scratch Being too old hands knees bit fueling starting airplanes put folding legs huge field box raise level permitted work standing position course field box/stand weighed much took two us move After building some plant stands PVC plastic pipe wife realized could have light field stand could handle easily comfort several months now have using stand shown enclosed photographs Built 1-in PVC pipe consists two ends two shelves supports airplane fastened ends bolts wing nuts permitting quicikly change fit different fuselages padding fuselage supports insulation sold PVC pipes 1 22 Model Aviation Plane Talk/Winter Continued page 37 two shelves simply two straight pipes held together sheet hardboard shelves ends joined spring clips shown pictures whole thing disassembles quickly fit car trunks room spare usually leave assembled carry airplane van Once decided sizes wanted figured out parts list construction took less hour expenditure less $10 field stand doubles great work stand shop stand problem solved turned problem equipment carried old field box Using scrap plywood built three boxes fueling box carries half-gallon plastic fuel tank 12-volt battery electric fuel pump starter box includes 12-volt battery power panel storage space glow plugs small tools electric starter tool box has drawer small tools parts storage compartments spare propellers larger tools equip ment cleaning equipment other essential items seldom needed put cleats ends bottom box fit over shelves keep boxes vibrating off shelf boxes quite light easily handled two 12-volt batteries provide back up prevent loss flying session forget charge Add folding chair jug coffee iced tea depending upon tempera ture have makings com fortable enjoyable flying session know youngsters will sneer such sissy stuff thought would pass along whatever worth hope will interest some other old-timers senior citizens seem coming RC hobby simplifi cation equipment might ensure sustained interest pleasant flying field conditions Thus spake Bill Greenhalgh Wetump ka AL Favor requested Will something cause close heart February 1986 ModelAirplane News Hal deBolt began new long-needed feature Golden Age RC has making long time us have put heads together help make possible always wanted self colunm specifically RC have interest Antique OldTimer modeling SAM Society Antique Modelers makes go Thats primarily based old Free Flight models RC-assist involved interest Old-Timer Control Line models obvious potential RC its own right has neglecteduntil now know 1950s 6-ft 35powered Smog Hog example does anything can Saturday Night Specialexcept go straight up Its easier safer fly things flown now came low-wing Smog Hog Sig Mfg Co perceived Kasmirski 45-powered Orion 1960 Aero batics World Champion still matches performance modern engine anything can think hot aerobatic airplane hundreds published once-kitted wonderful air planesdeltas canards name Ob viously an Antique era OldTimer era Nostalgic erastarting things like Goods Big Guff prewar days Taurus Orion 1960 Buzzard Bombshells could promote competitions aware majority will prefer simply enjoy flying historic planes Please contribute Hals column us hundreds pictures out Send background info Harold deBolt 2206 Greenwich Dr Kings Pt Sun City Center FL 33570 Without contributions column like deBolts cannot continued indefi nitely Photographic examples particular needed Falcon OldTimer dating late SOs Beams Esquires H-Rays Berkeleys Hollinger J 3 Fairchild PT on Walt Goods series history Radio Control began last month Chet Lanzo has asked help major presentation 1934 RC-1 prehistoric radio gear People keep building Krackerjac Rookie designers have same experience Beyond historic stuff now appearing magazine no continuity except deBolts Golden Age thing requires everyone interested assure prospers pictures good information Mining gold depends have gratitude joining effort Before long youll have yourself thank having bothered Bill Winter 4432 Altura Ct Fajifax VA 22030 Radio Technique/Myers Continued page 38 buy products object will likely accompanied warning literature manufacturer will receptive constructive criticism object being sold lacks such obvious liability/litigation potential manufacturers interest usually concen trates itself price profit performed static structural load test airplanes towhook/fuselage/wing combination Jugs water provided test load pint water weighs pound Note done before wing covered wing should depend covering strength sides something cracks want see well hear wing spar strong enough Only dowel needed changed Continued page 126 April 1986 123 C C El I m z 0 z z C 0 0 m I m 0 q 0 CD C 0 0 C -4 0 CD 0 Co U 0 -L N 0 0 01 x x N
Edition: Model Aviation - 1986/04
Page Numbers: 14, 16, 18, 20, 122, 123
___John Preston___________________________ Safety Comes First weighted blades RC Heli copters safety hints propel lers legal RC frequencies prob lem surfaces again eliminating flutter buzz CORRECTION I recently received let ter Glenn Scillian concerning report accident flying RC Helicopter reported column January 1986 issue Model Aviation seems report accident completely wrong may disservice RC Helicopter builders fliers previous report stated Glenn struck leg unweighted rotor blade thrown off models Glenn states let ter struck one-ounce lead weight come loose rotor blades letter Glenn enclosed copy letter wrote November 1984 Larry Jolly described accident dont believe Larry ever reported incident RC Helicopters column set record straight Im going use Glenns own words describe what really happened also apologize wrong account January issue summer 1983 suffered serious accident struck lead weight blade Heli copter found added ounce lead shape disk about inch diameter about A-inch thick blade model flew beau tifullymuch better unweight ed blades As far can recall blades never touched ground tall boom slugs epoxied cavity about three inches outside end blade cavity half hardwood half balsa grant long slender slug nesting en tirely hardwood would have safer disk shape recommended manufacturer use its Helicopters day revving engine up Helicopter sitting OR 004 ON Li Reader David Lewis suggests Iactoryappiied stickers RC transmitters system boxes such could help salespersons hobby shops sell legal radios novice RC hobbyists Preston discusses problem column ground about 12 feet front tail toward Just moment lift-off slug chunk wood blade let go struck right shin two inches below kneecap knocked down still held transmitter shut throttle down now-unbalanced copter thrashed violently ground literally tore off tail boom friend finally stopped blades pulled off fuel line Other friends applied some clean towels wound bleeding moderately drain ing bone-marrow oil driven nearest hospital about five miles away treated outpatient Exami Continued page 16 t II I5 ITS O5VIOLALY FRLAENCY AIkCY-AET cLY 14 Model Aviation UNIVERSAL IN-COWL AIRCRAFT MUFFLERS 19-4045-6075-13 engines UPSIONT ox INVICIED ENOINE Jt-40119-401600 JI-OGi45-901700 11-90175-131900 TTLAS0577 0T0530le0705e0 DUN tSmee 0e5 soc OATS 757 bA 7550 77 5577 504 Most versatile mufflers ever offered Designed fit inside cowls lImited soace can also used HELICOPTERS BOATS 0 For UPRIGHT INVERTED SIDE mounted engines 0 Exhaust tubes point almost direction S Worm drive clamp universal mounting can bolted directly engine BASIC DIMENSIONS INCLUDES Exhaust pipe extensions clamps553003737003007370700 worm drive clomp muffler alignment 0i plate gasket mounting screws S nOt 3073~IC 9031 hObby shop ORDER DIRECT tar rxnedote s9ment Check MO Visa MC COD accepted Add S260 tar UPS S200 tar COD 6% IcieR tax tar Cdt resident RETRACTABLE OW HOOK RELEASE Price SS90 Simplest reliable device available After line released hook retracts body unit leaving SMOOTH surface bottom aircraft No special attachments required N eight Y5 oz OTHER FOURMOST PRODUCTS 03C [5 ZAO[SW[TZ[5-] a S 164 School St Daly CIty CA 94014 415 756-3400 049/051 AIRFLO ENGINE MOUNT REDUCES DRAG VIBRATION FREE PRICE $300 40 AIRFLO ENGINE MOUNT IDEAL FOR QUICKY 500 PRICE $630 Fuel Fitting Sets Fuel Shut Off Fuel Manifold Gapless Hinges Gapless Hinge Slotter Strut Fairings Cockpit Coaming nation showed chipped tibia fortu nately no damage patella ligament wear soft cast about three weeks healing complete four five weeks Before returned flying weighted blades dis carded replaced Jeff Urcan s heavy blades As far can see fly well lead-weighted blades Glenns letter described another inci dent friend hovering Helicopter about eye level lead weight blades let go case nobody struck flying weight damage Helicopter due its unbalanced main rotor blades Before leaving subject let re mind readers emergency competi tion rule published September 1984 issue Model Aviation out lawed metal blades knife-edged leading edges blades metal blades beyond point two inches blade root attachment point emer gency rule enacted under AMA con test board procedures permit AMA president concurrence appropriate Contest Board chairman take emergency action dictated situation However make such emergency rules change permanent must ratified vote entire Contest Board must take place tween four six weeks after publication emergency rules change mem bers Helicopter Contest Board voted against rule concerning Helicopter blades So weighted blades still permitted AMA-sanctioned Helicopter contests Note however FAI rules RC Helicopters page 106 1986-87 rule book per mit metal blades metal weights blades knife-like leading edges blades PropellersIt seems appropriate switch potential hazard Heli copter blades presented blades propellers fixed-wing models Two readers contacted during last month phone letter subject blade separation propellers phone call Paul Geders St Louis MO inquire whether particular type non-wood prop involved significantly blade-shedding incidents other types Apparently fellow club members wanted outlaw use prop based incident damaged blade let go combed cor respondence records concerning prop cidents didnt really find enough documented incidents make statis tically-valid conclusions However found interesting appeared incidents blades separating wooden props plastic props Please regard statement Continued page 18 16 Model Aviation UPWCCTIIDVINVfITRORORSRROSIOI lee 434057770073 5311 CATAIfl Winning Ideas FOURMOST nd SASE Complete Information Ave Forest Grove OR 97116 PRODUCTS Phone 503 357-2732 4 vOl ec &cP C Al A0S oBB~ sendOR -cl meaning plastic props safer wood props Id rather aware blades may separate prop no matter what material fabricated letter concerning props came AE Richt Scott Depot WV en closed instructions received some Graupner Super fiberglassreinforced nylon props purchased major mail order hobby retailer instructions entirely German appeared contain some warning statements would-be users AE stated German far goodbut apparently better since able decipher care should taken ensure props dry-out Periodic boiling storing wet rag appeared recommended second warning appeared state prop tip velocity should ex ceed 180 meters/second AE supplied following table listing maximum rpm various prop diameters will exceed 180 in/sec tip speed Prop DI S 6 7 8 9 9 l0 lOS II 12 125 13 14 15 Max RPM 27000 22500 19300 16900 15000 14200 13500 12800 12300 11200 10800 10400 9600 9000 have sent Graupner prop instruc tions German-born engineer friend request translation thing else importance pops up translation Ill include next Safe ty column Meanwhile time gets print should have translated instructions will forward reader sending SASE address end column Which frequency model let ter arrived just day too late included last months Safety column contained very simple remedy mix-up can occur hobby store owner either knowingly unknowingly sells radio aircraft-only fre quency customer plans use boat car think major hobby retailers aware fact aircraft-only boat/car-only RC frequencies However follow ing letter David Lewis points out may some sources radios sales personnel aware fact have Navy last five years am now serving aboard Continued page 20 18 Model Aviation Spec al Detergents help prevent yarn sh p omo e c ean burning Rust Preventatives protect expens ye eng nes f om corrosion SIG CHAMPION 2 STROKE FUEL FREIGHT FREE sHIPPING ON ORDERS OVER $1500COLLECT PINTQUARTGALLON55 GAL DRUM 0N omethane$315$450$1050 00 5Ntromethane$365$525$1250 00 10%Ntrornethane$415$550$1450 00 15%Nitromethane$430$625$1650 00 25%Nitrornethane$495$750$2095 00 35%Ntromethane$575$875$2495 00 SIGPREMIUM4-STROKE FUEL 10%Nltromethane$415$550$1395 00 15%Nitrornethane$425$625$1595 00 THE CHOICE OF CHAMPION FLYERS Fr ars 510 has blending fuel finest qual ty ingrec e arie alcuha 99 - ery best grade available nitromethaxe use 1i ira get hunest r volume tar maximum lubrication get eb[end ot Bakers AA Cara K sty Tecvniplate Racing Oil protect expensive erg rs r try tivest qual ty t xl tva -av re avy price Dant tube wurd tor try vome cry ciurse[ti See dealer first available order direct Call 247-5008 toll free orders Latest Catalog $300 ~- SIG MANUFACTURING CO Montezuma IA 50171 xervnvire DYNATHRUST PROPS look great too! ALL FUTURE PRODUCTION ON ALL SIZES WILL HAVE LOGO AND TIPS PAINTED SIZES CURRENTLY AVAILABLE 13x6 15x6 8 $700 18x6 810 $1000 22x8 10- $1800 14x6 16x6 8 20x6 810 0 AddlSlzesAvailable Soon 2541 NE 11th Court ano Beach Florida 33062 e 13051 941-9119 AVAILABLE FROM LEADING DEALERS AND DISTRUBUTORS DIRECT CYANOACRYLATE CIAL INTROOUCTORY OFFER ListSaleSavings 1 oz Fast Cure 3-5 Sec$2500/0 Off 2 oz Fast Cure 3-5 Sec895$39656% Off 1 oz Gap-Filling 5 Sec495$2450% Off 2 oz Gap-Filling 5 Sec895$39656% Off OUR GUARANTEE TO YOU satisfied POSI-CURE please return unused portion within 30 days full refundNo questions asked SHELDONS HOBBY SHOP 3157 Alum Rock Ave Jose CA 95127r FOR ORDERS ONLY PLEASE 800 228-32370408 251-0789 Out State INFO 408 251-0787 California Hours Mon-Wed Fri & Sat 930-530 Thin 930-900 1200-500 destroyer USS Hoel travels have seen recurring problem Navy Exchange almost Navy base Ive visited will sell radio frequency anyone anything want done because no clear ID car boat aircraft use radio Sales personnel involved RC hobby dont realize what can lead said something about November Model Aviation Ill bet Navy aint ones letting happen So mark radios factory could save lot trouble maybe some airplanes such label See elsewhere columnJP anyone could figure out radio goes model selling prod uct whether involved hobby first read Davids letter struck suggestion ID label radio car/boat aircraftonly simple straightforward wondered nobody previ ously suggested Maybe has pre viously suggested rejected because reason another Obviously mark ing transmitter its use because its frequency will work transmitter frequency cannot changed However feature interchangeable RF module module itself could bear label indicating aircraft-only boat car-only use seems likely future will increasing number multi-frequency radios such currently-available Kraft Channel-Max synthesizes available RC frequencies Since AMA recommends displaying proper flag channel identification both contest sport flying manufacturers flags channel markers could include label indicating type use aircraft boat/car last months Safety column topic discussion should informative uniform instruc tions accompanying RC equipment seems radio systems should contain instructions lists frequencies designated aircraft boat/car look page 129 current 1986-87 AMA rule book states USE OF RADIO TUNED TO AIR CRAFT-ONLY FREQUENCY IN CAR OR BOAT IS AGAINST THE LAW case didnt already know law statement refers FCC regulation intend pass David Lewis sugges tion use-identification label AMA Safety Frequency Committees consideration note Dave Brown AMA District III VP member Safety Committee VP col umn February 1986 issue reports Frequency Committee meeting Continued page 122 20 Model Aviation F L IpJw per oruer FAST SERVICE COD ADD $190 POWERED MODELS Quality ormance ndability 1AA Control Line Airplanes Engines Accessories R/C Sailplanes Airplanes R/C Off-Road Cars SEND BASE FOR FREE MINI CATALOG COX HOBBIES INC 1525 E Warner Ave Santa Ana CA 92705 ATTENTION 1/4 SCALERS EPOXY GLASS COWLS FOR NOSEN PICA SID MORGAN BALSA USA PLATi CONCEPT FLEET HOSTETLER ACM T-CRAPT SHEBER PITTS N V SCALE SUPER CUB POKKER D-7 BOEING P12 P26 F4B2 F4B4 SPARROW HAWK GEE BEE MOD Y MACBAlERS TURBULENT CHRISTEN EAGLE BRISIGHELLAS STARDUSTER II SCALE J3-Bl BABY FLYBABY N OTHERS WHEEL PANTS FOR CITABRIA STARGUSTER II PEflS SKYBOLT LIBERTY SPORT CHRISTEN EAGLE PEE HAWK MULLIGAN N OTHERS LARGE SCALE PLANS AVAILABLE Please send $100 complete list supply ModelerS fiberglass parts plans Write Call us T & D FIBERGLASS SPECIALTIES 3B92B BLOCK GARDEN CITY MI 4B13B PHONE 3131421-6358 BRAZED & HEATTREATEO WIRE GEARS N cABANES PHONE 13131261-9064 PILOTS TS RIOR TS T THE MOST SUPERIOR PILOT FIGURE ON THE MARKET LIGHTEST WEIGHT MOST REALISTIC AVAILABLE GIVE YOUR PLANE PILOT FOR YOUR NEWEST OLDEST OR NEXT CREATION R YOURS TODAY FULL FIGURES CIVILIANWWII MILITARY 1/3 Scale $19951/5 Navy $1395 1/4 Scale14951/6AAF1195 1 /5 Scale1295 Plus 1/12 Scale895$250 shipping 1/12 Chopper 895each figure KNIGHTS OF THE AIR 1400 Rte 22 West Friendship MD 21794 301-489-5050 Letters Editor Continued page 12 compiling error having gone undetected long quantity E1115/61 usually much smaller quantity L*S2/Sl As such little error pro duced used probably noticed attributed geometric variations actual model Mr Donatelli found error may have used design di mensions producing severe imbab ance So Line 760 should read PL*S2/SlE1/15/Gl apologies error must lot modelers out computers already getting mail about article Design Analysis Program Dick Sarpolus Shrewsbury NJ Safety Preston Continued page 20 stated experiencing prob lems some parts country RC cars buggies using frequencies reserved aircraft. Perhaps Davids label suggestion can help alleviate some problems FlutterAnother item mentioned last months Safety column suggestion modeler should man datory checks models prevent con trol surface flutter November 1985 issue Corsair newsletter Joint Military R/G Fliers Club editor Marlin Kinning article flutter written noted modeler Cliff Weirick benefit readers may know what flutter can model Im reproducing Cliffs article FLUTTER Most know what seem some fliers dontor dont care break flutter down two levels full blown FLUTTER very destructive force second BUZZ Buzz too very destructive force slightly dif ferent way Lets look FLUTTER first can destroy airplane quicker can blink eye can attack sur face plane its prime targets ailerons followed closely elevator rudder flutter starts matter time until surface itself leaves plane takes sur face attached case two wings elevator counts up three airplanes stunt job wing failure next two Formula Ones Another aileron wing other elevator Actu ally very famousor should say infamouscrash lot oldtimers will remember Nats Los Alamitos NAS Boy what mess Now know what flutter can lets think about BUZZ hard describe because cant hear power model unless engine dead can hear flutter loud est engines whining away Buzz tends destroy servosand ultimately plane tends ruin gears worse yet attacks feedback pot ser vo does wearing small area usually around level-flight neutral position happens wonder sometimes controls may act funny What causes buzz Primarily two things Loose control surfaces sloppy tail-heavy loose sloppy pushrods etc see control surfaces look ready fall off airplane yet pilots ignore Same way pushrods Some builders drill %2-in holes control horn use 46-in wire Thats really asking sum up check things time go out fly remem ber tight will wear out get loose Have safe moath John Preston 12235 Tildenwood Dr Rockville MD 20852 responding advertisers mention read aboutthem ModelAviation drivers fuel pumps rolled aisles over power panels gallon fuel cans transmitter tray must got hand-held units Field boxes heavy wacky high-techand prop can cost seven bucks about power panel under nose run engines fancy hinged lids prevent getting anything plane figure top wedding cake ends up ground crawling aroundeasier get ting up down like jive puppet Im back knees now cant get up Legs no legs question Bill H Greenhalgh man after own heart dont have ambition brains too suffering herd guy lives place called Wetumpka Alabama must have right stuff am another old coot Au Good name next modeL built first model airplane back 1920s Bill edifies us after 30 years Air Corps/Air Force another 10 years doingthings government heart problem came back modeling After building Sig Kadet bitten RC bug since have built several airplanes mostly scratch Being too old hands knees bit fueling starting airplanes put folding legs huge field box raise level permitted work standing position course field box/stand weighed much took two us move After building some plant stands PVC plastic pipe wife realized could have light field stand could handle easily comfort several months now have using stand shown enclosed photographs Built 1-in PVC pipe consists two ends two shelves supports airplane fastened ends bolts wing nuts permitting quicikly change fit different fuselages padding fuselage supports insulation sold PVC pipes 1 22 Model Aviation Plane Talk/Winter Continued page 37 two shelves simply two straight pipes held together sheet hardboard shelves ends joined spring clips shown pictures whole thing disassembles quickly fit car trunks room spare usually leave assembled carry airplane van Once decided sizes wanted figured out parts list construction took less hour expenditure less $10 field stand doubles great work stand shop stand problem solved turned problem equipment carried old field box Using scrap plywood built three boxes fueling box carries half-gallon plastic fuel tank 12-volt battery electric fuel pump starter box includes 12-volt battery power panel storage space glow plugs small tools electric starter tool box has drawer small tools parts storage compartments spare propellers larger tools equip ment cleaning equipment other essential items seldom needed put cleats ends bottom box fit over shelves keep boxes vibrating off shelf boxes quite light easily handled two 12-volt batteries provide back up prevent loss flying session forget charge Add folding chair jug coffee iced tea depending upon tempera ture have makings com fortable enjoyable flying session know youngsters will sneer such sissy stuff thought would pass along whatever worth hope will interest some other old-timers senior citizens seem coming RC hobby simplifi cation equipment might ensure sustained interest pleasant flying field conditions Thus spake Bill Greenhalgh Wetump ka AL Favor requested Will something cause close heart February 1986 ModelAirplane News Hal deBolt began new long-needed feature Golden Age RC has making long time us have put heads together help make possible always wanted self colunm specifically RC have interest Antique OldTimer modeling SAM Society Antique Modelers makes go Thats primarily based old Free Flight models RC-assist involved interest Old-Timer Control Line models obvious potential RC its own right has neglecteduntil now know 1950s 6-ft 35powered Smog Hog example does anything can Saturday Night Specialexcept go straight up Its easier safer fly things flown now came low-wing Smog Hog Sig Mfg Co perceived Kasmirski 45-powered Orion 1960 Aero batics World Champion still matches performance modern engine anything can think hot aerobatic airplane hundreds published once-kitted wonderful air planesdeltas canards name Ob viously an Antique era OldTimer era Nostalgic erastarting things like Goods Big Guff prewar days Taurus Orion 1960 Buzzard Bombshells could promote competitions aware majority will prefer simply enjoy flying historic planes Please contribute Hals column us hundreds pictures out Send background info Harold deBolt 2206 Greenwich Dr Kings Pt Sun City Center FL 33570 Without contributions column like deBolts cannot continued indefi nitely Photographic examples particular needed Falcon OldTimer dating late SOs Beams Esquires H-Rays Berkeleys Hollinger J 3 Fairchild PT on Walt Goods series history Radio Control began last month Chet Lanzo has asked help major presentation 1934 RC-1 prehistoric radio gear People keep building Krackerjac Rookie designers have same experience Beyond historic stuff now appearing magazine no continuity except deBolts Golden Age thing requires everyone interested assure prospers pictures good information Mining gold depends have gratitude joining effort Before long youll have yourself thank having bothered Bill Winter 4432 Altura Ct Fajifax VA 22030 Radio Technique/Myers Continued page 38 buy products object will likely accompanied warning literature manufacturer will receptive constructive criticism object being sold lacks such obvious liability/litigation potential manufacturers interest usually concen trates itself price profit performed static structural load test airplanes towhook/fuselage/wing combination Jugs water provided test load pint water weighs pound Note done before wing covered wing should depend covering strength sides something cracks want see well hear wing spar strong enough Only dowel needed changed Continued page 126 April 1986 123 C C El I m z 0 z z C 0 0 m I m 0 q 0 CD C 0 0 C -4 0 CD 0 Co U 0 -L N 0 0 01 x x N