Techniaue MORE ABOUT safety question. commented way models getting bigger faster visible evidence stress anal ysis having done pre-flight static strength-testing asked whether readers agreed ModelAviation should present articles subjects So far have received four well-written letters em phatically favor idea opposed Now let tell true story Some time ago undertook build Sailplane review magazine MA wing plug-in tip panels supported -in-dia dowel dihedral joint looked plan said Too weak assumption no competent de signer would put money creating kit leaving such obvious weakness decided perform some elementary stress analysis Sailplane designed use high-stan launcher Experience fish scale told expect 12-lb pull towline launch rubber maximum stretch good wind careful control know possible get Sailplane almost vertically over high-start stake keeping rubber fully extended Therefore easy see wing must able support 12lb pull plus weight rubber towline parachute hanging tow hook. l about 20 pounds might want add another 20% account wind gusts wing supported weight usual way 20 pounds would distrib uted over projected span elliptically say would zero load tip increasing rapidly almost uniform loading point exami nation moves toward center wing As first approximation assume wing uniformly loaded calculate weight supported removable tip being projected area tip/pro jected area whole wing times 20 pounds Allowing elliptical taper air load assume whole tip force centered one-third way dihedral break tip Now can either analyze dowel using data engineering hand book did can break some dowels also did clamped brass tube vise inserted dowel slipped another brass tube over projecting pan dowel hung weight proper size proper distance Q/3 projected span dihedral break tip analysis said dowel would break broke completed plane took out its first test flights flew brass tubes substituting dowels flew removed brass tubes inserted dowels give design honest test tip tore off immediately after launch expected So wrote letters both kit manufacturer maga zine giving both engineering analysis test results am professional Aerospace Vehicle Test Engineer have 35 years gave manufacturer chance explain review error make production change publish change notice before review passed publication writers order retrieve situation gone bad kit manufacturer told magazine troublemaker magazine de clined publish review Commercial magazines depend ad vertising pay bills rarely see publishing reviews critical anything advertised thereinor likely leaves reader potential con sumer peculiar situation want information product cant find anything published must assume item defective just safe side Maybe no has gotten around testing/reviewing Reviewers often get criticized always saying things greatwhen expe rience later proves arent Now ask pays work done reviews dont get published reviewer want get paid must either sell publisher publish yourself Knowing reader now know should read between lines Some times reviewer trying tell nice way Dont waste money point exchange must protect yourselfl obvious danger ruinous lawsuit exists does manufacturers fuels paints con taining toxic inflammable components manufacturers high-energy rotating objects like engines propellers ducted fans Helicopters like can expect some testing has taken place Continued page 123 38 Model Aviation George M Myers Tom Hunt keeps building wonderful ducted-fan canards time its Grun S 25 driving Kress RK 7-20 fan unit still prototype stageto pr er bottom view L shows convenient location glow plug carb well asthe simple retract-geararra..1it no geardoors Hull fiberglass 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 DG DESIGNS Full Body Pilot KIt Lightest Pilot available oLIfelIke vinyl la tex rubber parts Easy assemble finish eBulid either barnstormer sportsman pilot eKit contains pilot head hands boots helmet cap goggles full templates easy instructions eFully positionable & moveable Some simple sewing required Weight Price 116 Scale 2oz* $ 795 1/4 Scale 4 oz $ 995 1/3Scale 6oz $1695 Weight may vary depending material used construction DGA DESIGNS Bust Pilot Kit Weight 1/6Scale 75oz 1/4 Scale 1Soz 1/3 Scale 225 oz Price 595 795 $1495 Lightest bust pilot available eLifelike vinyl latex rubber parts Easy assemble finish Build either barnstormer sportsman pilot Kit contains pilot head helmet cap goggles jacket instructions See dealer order direct Add $100 shipping direct orders Send $100 current catalog Dealers inquiries invited NYS Aesidents add 7 percent sales tax Send Check MO Allow 3 weeks check clearSorry-NO CODs Ei1wu ml Radio Technique/Myers Continued page 123 can perform same kinds tests enough interest exists will spend few columns simple test techniques want send note either MA s publisher George M Myers 70 Froehlich Farm Rd Hicksville NY 11801 Engines/Wilson Continued page 43 frontplate hole try hitting crankshaft little harder cases will job else fails automotive machine shops have press will definitely remove crankshaft Inspect crankshaft scoring grooves discoloration crankpin area around between bearings crankshaft shows roughness wear areas should re placed Again look replacement price before proceeding usually expensive part indication outer races bearings have turning frontplate frontplate should also replaced next challenge removing bearings frontplate front bearing inner race almost always smaller bore frontplate piece wood dowel approximate size bore frontplate can used hammer tap out front bearing rear bearing tight enough stay crankshaft puller used remove drive hub will get off have Gator RC bearing puller removal rear bearing frontplate should no problem Otherwise try heating frontplate pan boiling water Hopefully aluminum frontplate will expand steel bearing outer race allowing removed sufficient room previouslymentioned wire hook may inserted through bearing inner bore help pull out Again use cooking mitt handle frontplate during procedure Reassembly New bearings should gent ly tapped place frontplate plastic hammer Tap around outer race being careful bearing goes bore evenly Dont let bearing get cocked bore crankshaft can used guide get bearing straight sure bearing tapped way bore Keep clean dont want ruin new bearings bearings place oil insert crankshaft prop drive hub K&B 40 must aligned pin holes setscrew match cor responding hole flat crankshaft engines fits tight must driven place hammer Again protect hub counterbalance crankshaft wood blocks ham mering pin hole hub aligned pin hole crankshaft drive roll pin place tighten setscrew other engines drive hub simply slips place Rotate crank shaft few times assure turning freely havent picked up dirt bearings Ring-type pistons sleeves piston rings available separately need purchased matched sets fit piston ring-type engine critical other types unless special racing engine being assembled Some engines have small pin ring groove hold ring given position respect ports carefully check such pin before installing ring piston Some rings such Dykes ring K&B 40 have top bottom cases direction obvious doubt look original piston ring Insert ring cylinder sleeve push little way piston square bore should gap about 0002 inch bore between ends ring no feeler gauge available check see light visible between ends clear ance probably okay engines bore i less no gap visible remove ring file sand ends slightly holding ends together rubbing thin file wet-or-dry sandpaper between File little check often its easy go too far ruin ring ring gap correct clean up ring sure no burrs around ends Carefully spread ring slip over top piston ring groove Align ends pin has Check fit big end connecting rod crankpin should bind does get another connecting rod its unlikely new connecting rod will fit properly Compare new connecting rod old de termine side goes front engine Frequently oil hole side big end fits crankshaft should face specific direction Pistons baffle fence top should have baffle toward intake ports Being sure parts clean facing proper direction oil assemble connecting rod piston inserting wrist pin Most wrist pins have pads ends made Teflon some other relatively soft material pre vent scuffing sleeve Make sure pads place Some wrist pins go way through piston have such pad instance pad obviously end will exposed sleeve area piston pin exposed should aligned ports sleeve Pistons/sleeves ABC engines 126 Model Aviation monthly publication covering International RC Soaring Scene $1 6/yr US Canada & Mexico $24/yr elsewhere via airmail Post Office Box 269 Peterborough NH 03458
Edition: Model Aviation - 1986/04
Page Numbers: 38, 123, 126
Techniaue MORE ABOUT safety question. commented way models getting bigger faster visible evidence stress anal ysis having done pre-flight static strength-testing asked whether readers agreed ModelAviation should present articles subjects So far have received four well-written letters em phatically favor idea opposed Now let tell true story Some time ago undertook build Sailplane review magazine MA wing plug-in tip panels supported -in-dia dowel dihedral joint looked plan said Too weak assumption no competent de signer would put money creating kit leaving such obvious weakness decided perform some elementary stress analysis Sailplane designed use high-stan launcher Experience fish scale told expect 12-lb pull towline launch rubber maximum stretch good wind careful control know possible get Sailplane almost vertically over high-start stake keeping rubber fully extended Therefore easy see wing must able support 12lb pull plus weight rubber towline parachute hanging tow hook. l about 20 pounds might want add another 20% account wind gusts wing supported weight usual way 20 pounds would distrib uted over projected span elliptically say would zero load tip increasing rapidly almost uniform loading point exami nation moves toward center wing As first approximation assume wing uniformly loaded calculate weight supported removable tip being projected area tip/pro jected area whole wing times 20 pounds Allowing elliptical taper air load assume whole tip force centered one-third way dihedral break tip Now can either analyze dowel using data engineering hand book did can break some dowels also did clamped brass tube vise inserted dowel slipped another brass tube over projecting pan dowel hung weight proper size proper distance Q/3 projected span dihedral break tip analysis said dowel would break broke completed plane took out its first test flights flew brass tubes substituting dowels flew removed brass tubes inserted dowels give design honest test tip tore off immediately after launch expected So wrote letters both kit manufacturer maga zine giving both engineering analysis test results am professional Aerospace Vehicle Test Engineer have 35 years gave manufacturer chance explain review error make production change publish change notice before review passed publication writers order retrieve situation gone bad kit manufacturer told magazine troublemaker magazine de clined publish review Commercial magazines depend ad vertising pay bills rarely see publishing reviews critical anything advertised thereinor likely leaves reader potential con sumer peculiar situation want information product cant find anything published must assume item defective just safe side Maybe no has gotten around testing/reviewing Reviewers often get criticized always saying things greatwhen expe rience later proves arent Now ask pays work done reviews dont get published reviewer want get paid must either sell publisher publish yourself Knowing reader now know should read between lines Some times reviewer trying tell nice way Dont waste money point exchange must protect yourselfl obvious danger ruinous lawsuit exists does manufacturers fuels paints con taining toxic inflammable components manufacturers high-energy rotating objects like engines propellers ducted fans Helicopters like can expect some testing has taken place Continued page 123 38 Model Aviation George M Myers Tom Hunt keeps building wonderful ducted-fan canards time its Grun S 25 driving Kress RK 7-20 fan unit still prototype stageto pr er bottom view L shows convenient location glow plug carb well asthe simple retract-geararra..1it no geardoors Hull fiberglass 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 DG DESIGNS Full Body Pilot KIt Lightest Pilot available oLIfelIke vinyl la tex rubber parts Easy assemble finish eBulid either barnstormer sportsman pilot eKit contains pilot head hands boots helmet cap goggles full templates easy instructions eFully positionable & moveable Some simple sewing required Weight Price 116 Scale 2oz* $ 795 1/4 Scale 4 oz $ 995 1/3Scale 6oz $1695 Weight may vary depending material used construction DGA DESIGNS Bust Pilot Kit Weight 1/6Scale 75oz 1/4 Scale 1Soz 1/3 Scale 225 oz Price 595 795 $1495 Lightest bust pilot available eLifelike vinyl latex rubber parts Easy assemble finish Build either barnstormer sportsman pilot Kit contains pilot head helmet cap goggles jacket instructions See dealer order direct Add $100 shipping direct orders Send $100 current catalog Dealers inquiries invited NYS Aesidents add 7 percent sales tax Send Check MO Allow 3 weeks check clearSorry-NO CODs Ei1wu ml Radio Technique/Myers Continued page 123 can perform same kinds tests enough interest exists will spend few columns simple test techniques want send note either MA s publisher George M Myers 70 Froehlich Farm Rd Hicksville NY 11801 Engines/Wilson Continued page 43 frontplate hole try hitting crankshaft little harder cases will job else fails automotive machine shops have press will definitely remove crankshaft Inspect crankshaft scoring grooves discoloration crankpin area around between bearings crankshaft shows roughness wear areas should re placed Again look replacement price before proceeding usually expensive part indication outer races bearings have turning frontplate frontplate should also replaced next challenge removing bearings frontplate front bearing inner race almost always smaller bore frontplate piece wood dowel approximate size bore frontplate can used hammer tap out front bearing rear bearing tight enough stay crankshaft puller used remove drive hub will get off have Gator RC bearing puller removal rear bearing frontplate should no problem Otherwise try heating frontplate pan boiling water Hopefully aluminum frontplate will expand steel bearing outer race allowing removed sufficient room previouslymentioned wire hook may inserted through bearing inner bore help pull out Again use cooking mitt handle frontplate during procedure Reassembly New bearings should gent ly tapped place frontplate plastic hammer Tap around outer race being careful bearing goes bore evenly Dont let bearing get cocked bore crankshaft can used guide get bearing straight sure bearing tapped way bore Keep clean dont want ruin new bearings bearings place oil insert crankshaft prop drive hub K&B 40 must aligned pin holes setscrew match cor responding hole flat crankshaft engines fits tight must driven place hammer Again protect hub counterbalance crankshaft wood blocks ham mering pin hole hub aligned pin hole crankshaft drive roll pin place tighten setscrew other engines drive hub simply slips place Rotate crank shaft few times assure turning freely havent picked up dirt bearings Ring-type pistons sleeves piston rings available separately need purchased matched sets fit piston ring-type engine critical other types unless special racing engine being assembled Some engines have small pin ring groove hold ring given position respect ports carefully check such pin before installing ring piston Some rings such Dykes ring K&B 40 have top bottom cases direction obvious doubt look original piston ring Insert ring cylinder sleeve push little way piston square bore should gap about 0002 inch bore between ends ring no feeler gauge available check see light visible between ends clear ance probably okay engines bore i less no gap visible remove ring file sand ends slightly holding ends together rubbing thin file wet-or-dry sandpaper between File little check often its easy go too far ruin ring ring gap correct clean up ring sure no burrs around ends Carefully spread ring slip over top piston ring groove Align ends pin has Check fit big end connecting rod crankpin should bind does get another connecting rod its unlikely new connecting rod will fit properly Compare new connecting rod old de termine side goes front engine Frequently oil hole side big end fits crankshaft should face specific direction Pistons baffle fence top should have baffle toward intake ports Being sure parts clean facing proper direction oil assemble connecting rod piston inserting wrist pin Most wrist pins have pads ends made Teflon some other relatively soft material pre vent scuffing sleeve Make sure pads place Some wrist pins go way through piston have such pad instance pad obviously end will exposed sleeve area piston pin exposed should aligned ports sleeve Pistons/sleeves ABC engines 126 Model Aviation monthly publication covering International RC Soaring Scene $1 6/yr US Canada & Mexico $24/yr elsewhere via airmail Post Office Box 269 Peterborough NH 03458
Edition: Model Aviation - 1986/04
Page Numbers: 38, 123, 126
Techniaue MORE ABOUT safety question. commented way models getting bigger faster visible evidence stress anal ysis having done pre-flight static strength-testing asked whether readers agreed ModelAviation should present articles subjects So far have received four well-written letters em phatically favor idea opposed Now let tell true story Some time ago undertook build Sailplane review magazine MA wing plug-in tip panels supported -in-dia dowel dihedral joint looked plan said Too weak assumption no competent de signer would put money creating kit leaving such obvious weakness decided perform some elementary stress analysis Sailplane designed use high-stan launcher Experience fish scale told expect 12-lb pull towline launch rubber maximum stretch good wind careful control know possible get Sailplane almost vertically over high-start stake keeping rubber fully extended Therefore easy see wing must able support 12lb pull plus weight rubber towline parachute hanging tow hook. l about 20 pounds might want add another 20% account wind gusts wing supported weight usual way 20 pounds would distrib uted over projected span elliptically say would zero load tip increasing rapidly almost uniform loading point exami nation moves toward center wing As first approximation assume wing uniformly loaded calculate weight supported removable tip being projected area tip/pro jected area whole wing times 20 pounds Allowing elliptical taper air load assume whole tip force centered one-third way dihedral break tip Now can either analyze dowel using data engineering hand book did can break some dowels also did clamped brass tube vise inserted dowel slipped another brass tube over projecting pan dowel hung weight proper size proper distance Q/3 projected span dihedral break tip analysis said dowel would break broke completed plane took out its first test flights flew brass tubes substituting dowels flew removed brass tubes inserted dowels give design honest test tip tore off immediately after launch expected So wrote letters both kit manufacturer maga zine giving both engineering analysis test results am professional Aerospace Vehicle Test Engineer have 35 years gave manufacturer chance explain review error make production change publish change notice before review passed publication writers order retrieve situation gone bad kit manufacturer told magazine troublemaker magazine de clined publish review Commercial magazines depend ad vertising pay bills rarely see publishing reviews critical anything advertised thereinor likely leaves reader potential con sumer peculiar situation want information product cant find anything published must assume item defective just safe side Maybe no has gotten around testing/reviewing Reviewers often get criticized always saying things greatwhen expe rience later proves arent Now ask pays work done reviews dont get published reviewer want get paid must either sell publisher publish yourself Knowing reader now know should read between lines Some times reviewer trying tell nice way Dont waste money point exchange must protect yourselfl obvious danger ruinous lawsuit exists does manufacturers fuels paints con taining toxic inflammable components manufacturers high-energy rotating objects like engines propellers ducted fans Helicopters like can expect some testing has taken place Continued page 123 38 Model Aviation George M Myers Tom Hunt keeps building wonderful ducted-fan canards time its Grun S 25 driving Kress RK 7-20 fan unit still prototype stageto pr er bottom view L shows convenient location glow plug carb well asthe simple retract-geararra..1it no geardoors Hull fiberglass 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 DG DESIGNS Full Body Pilot KIt Lightest Pilot available oLIfelIke vinyl la tex rubber parts Easy assemble finish eBulid either barnstormer sportsman pilot eKit contains pilot head hands boots helmet cap goggles full templates easy instructions eFully positionable & moveable Some simple sewing required Weight Price 116 Scale 2oz* $ 795 1/4 Scale 4 oz $ 995 1/3Scale 6oz $1695 Weight may vary depending material used construction DGA DESIGNS Bust Pilot Kit Weight 1/6Scale 75oz 1/4 Scale 1Soz 1/3 Scale 225 oz Price 595 795 $1495 Lightest bust pilot available eLifelike vinyl latex rubber parts Easy assemble finish Build either barnstormer sportsman pilot Kit contains pilot head helmet cap goggles jacket instructions See dealer order direct Add $100 shipping direct orders Send $100 current catalog Dealers inquiries invited NYS Aesidents add 7 percent sales tax Send Check MO Allow 3 weeks check clearSorry-NO CODs Ei1wu ml Radio Technique/Myers Continued page 123 can perform same kinds tests enough interest exists will spend few columns simple test techniques want send note either MA s publisher George M Myers 70 Froehlich Farm Rd Hicksville NY 11801 Engines/Wilson Continued page 43 frontplate hole try hitting crankshaft little harder cases will job else fails automotive machine shops have press will definitely remove crankshaft Inspect crankshaft scoring grooves discoloration crankpin area around between bearings crankshaft shows roughness wear areas should re placed Again look replacement price before proceeding usually expensive part indication outer races bearings have turning frontplate frontplate should also replaced next challenge removing bearings frontplate front bearing inner race almost always smaller bore frontplate piece wood dowel approximate size bore frontplate can used hammer tap out front bearing rear bearing tight enough stay crankshaft puller used remove drive hub will get off have Gator RC bearing puller removal rear bearing frontplate should no problem Otherwise try heating frontplate pan boiling water Hopefully aluminum frontplate will expand steel bearing outer race allowing removed sufficient room previouslymentioned wire hook may inserted through bearing inner bore help pull out Again use cooking mitt handle frontplate during procedure Reassembly New bearings should gent ly tapped place frontplate plastic hammer Tap around outer race being careful bearing goes bore evenly Dont let bearing get cocked bore crankshaft can used guide get bearing straight sure bearing tapped way bore Keep clean dont want ruin new bearings bearings place oil insert crankshaft prop drive hub K&B 40 must aligned pin holes setscrew match cor responding hole flat crankshaft engines fits tight must driven place hammer Again protect hub counterbalance crankshaft wood blocks ham mering pin hole hub aligned pin hole crankshaft drive roll pin place tighten setscrew other engines drive hub simply slips place Rotate crank shaft few times assure turning freely havent picked up dirt bearings Ring-type pistons sleeves piston rings available separately need purchased matched sets fit piston ring-type engine critical other types unless special racing engine being assembled Some engines have small pin ring groove hold ring given position respect ports carefully check such pin before installing ring piston Some rings such Dykes ring K&B 40 have top bottom cases direction obvious doubt look original piston ring Insert ring cylinder sleeve push little way piston square bore should gap about 0002 inch bore between ends ring no feeler gauge available check see light visible between ends clear ance probably okay engines bore i less no gap visible remove ring file sand ends slightly holding ends together rubbing thin file wet-or-dry sandpaper between File little check often its easy go too far ruin ring ring gap correct clean up ring sure no burrs around ends Carefully spread ring slip over top piston ring groove Align ends pin has Check fit big end connecting rod crankpin should bind does get another connecting rod its unlikely new connecting rod will fit properly Compare new connecting rod old de termine side goes front engine Frequently oil hole side big end fits crankshaft should face specific direction Pistons baffle fence top should have baffle toward intake ports Being sure parts clean facing proper direction oil assemble connecting rod piston inserting wrist pin Most wrist pins have pads ends made Teflon some other relatively soft material pre vent scuffing sleeve Make sure pads place Some wrist pins go way through piston have such pad instance pad obviously end will exposed sleeve area piston pin exposed should aligned ports sleeve Pistons/sleeves ABC engines 126 Model Aviation monthly publication covering International RC Soaring Scene $1 6/yr US Canada & Mexico $24/yr elsewhere via airmail Post Office Box 269 Peterborough NH 03458