For sport flying trainer-type airplanes tour-cycle engine just cant topped quiet operation truly miserly fuel use throttle response extremely smooth high incredible slow idlejust whats needed perfect match airplane engine learning flier photo left shows Saito 45 Onestone July 1979 MAon right 05 FS-40 Onestep September 1981 MA Conga line has little common four-cycle model engine does have right rhythm author helps us get better ac quainted increasingly-popular quiet power plant L F Randolph _ne Three Ktck Above array tools provided four-ccle engines impressive good chance will never used manufacturers want make sure have needed Saito has built-in choke can operated outside cowl Right Engine mounts need little longer four-strokers because carb usually located rear Mounts rear-rotary engines work fine 05 comes drilling template mounting 40 Model Aviation %t e All engines should bench-run before mounting air planeespecially true four-cycles bit different run two-cycle best place get acquainted test stand instance cant lean Out four-cycle two-cycle can tell needle set exhaust sound glow plug worthy mention follow manufacturers advice because wrong plug can make big difference performance Right Thats breather backplate pressure tap fuel-air mixture does pass through crankcase afour-cycletherefore piston goes up down breather provides pressure relief lubrication crankshaft bearing receives oil slips piston crankcase shot two Marvel Mystery Oil through breather after flying session will add life engine photos author RC FLYING IS done hearing well seeing Before flight starts tuning engine done sound air sound throttle being retarded engine going lean lugging heard before visual indication given controls moved compensate same time fool ourselves sound hear recording model airplane engine surprised high thin noise comes outand usually blame effect poor recording Actually equipment correct brain translates pops roar airplane flying Unfortunately hobby-sport have such translator engines sound like recording dependence sound reason first flights four-cycle-enginepowered airplane surprise en gine just doesnt sound though run ning fast enough fly airplane after ground run twice long necessary airplane flying well feeling still persists takes quite few flights round loops good vertical figures realize power sound really realistic before Sound therefore real importance us fliers well public case public term noise rather sound four-cycle engine RC aircraft may well answer pleases both bonus flying time gallon rather expensive fuel two-cycle engine have long used airplanes very remarkable powerful machine has brought near perfection yet still sends nearly much fuel out exhaust stack actually burns cylinder operation two-cycle engine such exhaust Continued page 42 Some four-cycle engines have open pushrods valve lifters rocker arms fly dusty conditions valve pushrod covers best bet little oil after flying well worth considering After four-cycle engine has run may necessary adlust rocker arms because pushrod wear righthand photo As necessary amount play between rocker arm valve gauges supplied check play thanks World Engines Hobby Shack supplying engines used report May 1984 41 New Four Laser PRECISION BUILT MODELS AND KITS INTRODUCES VERSATILITY IN KIT Turn Around Pattern Stand Off Scale Fun Fly Events /e Scale Kit Includes 7 8 lbs Wing Span Wing Area sq Plug Wings Removeable Tail Assembly Tune Pipe fits inside fuse Wood Construction Foam Wings Complete Kit Epoxyglass Cowl & Wheelpants Formed Landing Gear Small Parts Recommended Engines 60 90 12 Cu Designed G L C airplane cover competitive needs Extensively tested top pattern flyer PRECISION BUILT MODELS & KITS 1818 6th Ave W Bradenton Fl 33505 813 747-7006 GIANT SCALE ACCESSORIESVCO MODEL SuppIies Three New Cockpits1885 Dyson St Muskegon MI 49442 A61VI5 Zero Kit features 20 molded pieces gunsight two machine gun breecha instrument panel Sidewalls seat vac-u-formed fit Platt Scale Flight$2595 Kit includes exhaust impingement plates detailed oil ZERO EXTERIOR KIT cooler scope wing blister used shell exhaust ports $1095 molded cockpit parts include tiny scale switches quadrants control leavers instrument panel Instrument faces clear Itwol color reroduction Seat vac-u-formed V scale fit BarronsBryons$21 features molded K-14a gunsight cockpit complete detail includes instrument panel sidewalls seat Also included complete placard shetlIO scale fit Scale_____$2195 5001 Samba ISaltablaar 116 scala$550 eachAM $275 aIlqsliug heading 10001 Samba ISaitabla far I/Sari/b acala teen$750 eachStamp far catalag K 9 ATTENTION MANUFACTURERS would like forming work Send pattern samples quotes Still Using bid Fashioned Wing Hinges will gain Control efficiency eliminating gap between moveable .nd stationary control surfaces will amazed performance gained using simple inexpen sive improvementl FREE MOVEMENT 450 STRONG AND LIGHTWEIGHT COMPLETELY FUELPROOF COMPATABLE WITH ALL IRON-ON MATERIALS COMES IN FT LENGTHS SMALL lit ORPRICE 3 ft $250 LARGE I/A EASY TO INSTALL 1 SUE ND ESAR RY ACGVqPR ALONG ENTAPE JOINT FOR ADDITIONAL SEWRITI sERT SMALL RN EVERY FEW HES CUT OFF FLUSH FILL AND SAND AS NEEDED FOR FINISHING Send Free info fine products FOURMOST PRODUCTS 4040 24th Avenue Forest Grove OR 97116 CUT 1/4 DEEP SLIT ALLRIO TIE FULL LENGTH O THE MATALG SURFACES port opened descending piston gasified fuel still burning part burning takes place outside cylinder Like report pistol bullet has left barrel noise generated short tme later intake port opened piston its way down fresh charge fuel pushed cylinder compression fuel-air mixture crankcase Some fresh charge also goes out still-open exhaust port burning fuel-air mixture occurs cylinder head four-cycle engine burned gasses cannot escape cylinder until piston bottom its stroke exhaust valve opens Actually piston pushes burned gasses out exhaust returns top cylinder piston pulls new charge fuel air com bustion chamber descends cylin der second time compresses new charge ascends another power stroke fuel-air mixture ignited piston once reaches top cylinder up-down up-down movement piston time plug fires reason term four stroke cycle usually shortened four-cycle fourstroke also reason fuel goes engine burned powerand because explosion burning fuel contained occurs once two revolutions pro peller operation quiet comparison two-cycle engine two-cycle engine piston itself valve opens closes intake exhaust ports four-cycle must done different manner intake exhaust valves located head rather sleeve activated proper order cams geared crankshaft make four-cycle engine uses rotary type valves operated belt sys tems use pushrods both systems timing critical disassembly recommended pushrods work through rocker arms open close valves required posi tion piston few drops oil rocker arms after flying session very good idea fuel requirement fourcycle same two-cycle experts contrary skimp oil thing should done after initial break-in running period different two-cycle oper ation adjustment rocker arms After period time pushrods tend wear become slightly shorter rocker arm screw adjustment com pensates wear adjustment well covered manuals come engines along proper tools gauges complete task procedure simple after adjustment clear ances can checked gauges periodically assure engine per forming its peak Continued page 139 42 Model Aviation II 4 Direct Sales Only QAPLESS HiNGE SLOTTER Simplifies installation Gapless Hinges Makes Slois 4 Sizes Balsa E $250 24 insignia sheets also letters numbers 0 niajordecals available popular 40 -60 sizes plus American Giant Scale size believe majordeC8I5 have comprehensive assortment available now -with sizes styles coming time pressure sensitive water transfer WellbetthlslsOflellfle handing line.the complete line decals available model anywhere OCAG l love being handed major decals Os buos nqu es nv ed TEL 413 525 4110 CONTACT YOUR LOCAL HOBBY SHOP OR WRITE OIREIZT NORTHEAST SCREEN CRAPHICS 21 FISHER AVE. EAST LOOGMEADOW MA 01028 plugging airplane fly course youd need system inter changeable receiver crystals sides flying buddies might like thought youll have transmitter out impound area youre using fly could lead next solu tion still expensive Figure 4 shows 721 converter sold John Lange fully described construction article Receiving Converters RC Frequencies Model Aviation Feb ruary 1982 page 36 et seq John has sev eral versions item available might want contact him 1700 N 37th Ave Stone Park IL 60165 As know have attached discarded automobile radio use lot advantage rig can tune between RC channels thereby letting hear Com mercial Carrier stations live great help identifying inter ference sources John Lange DFC-at-large has donated couple built-up units AMA use AMA-sponsored contests have added some tape recordings ex plain use give exam ples kinds things might hear rapid education persons might use Figure 5 shows programmable scanner made Australian market scans new RC channels Jack Albrecht bought AMA trip ll Hershberger did some work improve little Both men members AMA frequency committee arent tunate have right kind men job unit kept AMA HQ used needed AMA competitions tape recording unit well Ive heard rumors Bearcat manu facturers scanners virtually thing considering making similar unit available US write ask may sooner George M Myers 70 Froehlich Farm Rd Hicksville NY 11801 Four-Cycle/Randolph Continued DaGe 42 Four-cycle engines have crankcase breathers As piston goes up down cylinder air must come go out crankcase breather provided al low action pressure tap tightly-cowled engine installation should vented outside squirt oil breather after flying session gives shaft bearings good lubrication ability turn larger efficient pro pellers reasonable speed tends offset somewhat less power developed four-cycle compared faster-revving two-stroker example 40 four-cycle easily turns 12-6 prop 8500 9000 rpm ability should especially appeal fly Scale airplanes large radial cowls summary state-of-the-art now stands four-cycle engine produces about 75% much power same size twocycle does half fuel ear one-fourth much noise noise rumble rather whine Recommended additional reading Small Gas Engines Paul Weissler Harper & Row About Small Gas Engines Jud Purvis Goodheart-Wilcox Diesel & High Compression Gas Engine Fundamentals Edgar J Kates American Technical Society Internal Combustion Engine Works David Urquhart Henry Z Walck Inc writing advertisers mention read about Model Aviation LI _____COMPLETE THIS FORM t1JE4SUEA MAILING uj\E7.LABEL FROM RECENT LET US KNOW WHERE YOU ARE GOING move please let US know advanceSIX weeks required change address Attach current MA mailing label check appropriate box mail Subscrip tion Dept Model AviatIon 1810 Samuel Morse Dr Reston VA 22090 Check appropriate boxenclose payment C NEW SUBSCRIPTION U CHANGE OF ADDRESS Non-AMA subscription rates $1800 12 months US possessions eisewhere Including Canada Mexico $2400 US Schools $900 US Libraries $1350 NAME ADDRESS CITY/STATf _______________________________________________ ZIP ________________ MODEL AVIATION 1810 SAMUEL MORSE DR RESTON VA 22090 May1984 139 FLYING NEAR AIRPORTS BE CAREFUL PROTECT YOUR RIGHT TO FLY Safe Flying No Accident
Edition: Model Aviation - 1984/05
Page Numbers: 40, 41, 42, 139
For sport flying trainer-type airplanes tour-cycle engine just cant topped quiet operation truly miserly fuel use throttle response extremely smooth high incredible slow idlejust whats needed perfect match airplane engine learning flier photo left shows Saito 45 Onestone July 1979 MAon right 05 FS-40 Onestep September 1981 MA Conga line has little common four-cycle model engine does have right rhythm author helps us get better ac quainted increasingly-popular quiet power plant L F Randolph _ne Three Ktck Above array tools provided four-ccle engines impressive good chance will never used manufacturers want make sure have needed Saito has built-in choke can operated outside cowl Right Engine mounts need little longer four-strokers because carb usually located rear Mounts rear-rotary engines work fine 05 comes drilling template mounting 40 Model Aviation %t e All engines should bench-run before mounting air planeespecially true four-cycles bit different run two-cycle best place get acquainted test stand instance cant lean Out four-cycle two-cycle can tell needle set exhaust sound glow plug worthy mention follow manufacturers advice because wrong plug can make big difference performance Right Thats breather backplate pressure tap fuel-air mixture does pass through crankcase afour-cycletherefore piston goes up down breather provides pressure relief lubrication crankshaft bearing receives oil slips piston crankcase shot two Marvel Mystery Oil through breather after flying session will add life engine photos author RC FLYING IS done hearing well seeing Before flight starts tuning engine done sound air sound throttle being retarded engine going lean lugging heard before visual indication given controls moved compensate same time fool ourselves sound hear recording model airplane engine surprised high thin noise comes outand usually blame effect poor recording Actually equipment correct brain translates pops roar airplane flying Unfortunately hobby-sport have such translator engines sound like recording dependence sound reason first flights four-cycle-enginepowered airplane surprise en gine just doesnt sound though run ning fast enough fly airplane after ground run twice long necessary airplane flying well feeling still persists takes quite few flights round loops good vertical figures realize power sound really realistic before Sound therefore real importance us fliers well public case public term noise rather sound four-cycle engine RC aircraft may well answer pleases both bonus flying time gallon rather expensive fuel two-cycle engine have long used airplanes very remarkable powerful machine has brought near perfection yet still sends nearly much fuel out exhaust stack actually burns cylinder operation two-cycle engine such exhaust Continued page 42 Some four-cycle engines have open pushrods valve lifters rocker arms fly dusty conditions valve pushrod covers best bet little oil after flying well worth considering After four-cycle engine has run may necessary adlust rocker arms because pushrod wear righthand photo As necessary amount play between rocker arm valve gauges supplied check play thanks World Engines Hobby Shack supplying engines used report May 1984 41 New Four Laser PRECISION BUILT MODELS AND KITS INTRODUCES VERSATILITY IN KIT Turn Around Pattern Stand Off Scale Fun Fly Events /e Scale Kit Includes 7 8 lbs Wing Span Wing Area sq Plug Wings Removeable Tail Assembly Tune Pipe fits inside fuse Wood Construction Foam Wings Complete Kit Epoxyglass Cowl & Wheelpants Formed Landing Gear Small Parts Recommended Engines 60 90 12 Cu Designed G L C airplane cover competitive needs Extensively tested top pattern flyer PRECISION BUILT MODELS & KITS 1818 6th Ave W Bradenton Fl 33505 813 747-7006 GIANT SCALE ACCESSORIESVCO MODEL SuppIies Three New Cockpits1885 Dyson St Muskegon MI 49442 A61VI5 Zero Kit features 20 molded pieces gunsight two machine gun breecha instrument panel Sidewalls seat vac-u-formed fit Platt Scale Flight$2595 Kit includes exhaust impingement plates detailed oil ZERO EXTERIOR KIT cooler scope wing blister used shell exhaust ports $1095 molded cockpit parts include tiny scale switches quadrants control leavers instrument panel Instrument faces clear Itwol color reroduction Seat vac-u-formed V scale fit BarronsBryons$21 features molded K-14a gunsight cockpit complete detail includes instrument panel sidewalls seat Also included complete placard shetlIO scale fit Scale_____$2195 5001 Samba ISaltablaar 116 scala$550 eachAM $275 aIlqsliug heading 10001 Samba ISaitabla far I/Sari/b acala teen$750 eachStamp far catalag K 9 ATTENTION MANUFACTURERS would like forming work Send pattern samples quotes Still Using bid Fashioned Wing Hinges will gain Control efficiency eliminating gap between moveable .nd stationary control surfaces will amazed performance gained using simple inexpen sive improvementl FREE MOVEMENT 450 STRONG AND LIGHTWEIGHT COMPLETELY FUELPROOF COMPATABLE WITH ALL IRON-ON MATERIALS COMES IN FT LENGTHS SMALL lit ORPRICE 3 ft $250 LARGE I/A EASY TO INSTALL 1 SUE ND ESAR RY ACGVqPR ALONG ENTAPE JOINT FOR ADDITIONAL SEWRITI sERT SMALL RN EVERY FEW HES CUT OFF FLUSH FILL AND SAND AS NEEDED FOR FINISHING Send Free info fine products FOURMOST PRODUCTS 4040 24th Avenue Forest Grove OR 97116 CUT 1/4 DEEP SLIT ALLRIO TIE FULL LENGTH O THE MATALG SURFACES port opened descending piston gasified fuel still burning part burning takes place outside cylinder Like report pistol bullet has left barrel noise generated short tme later intake port opened piston its way down fresh charge fuel pushed cylinder compression fuel-air mixture crankcase Some fresh charge also goes out still-open exhaust port burning fuel-air mixture occurs cylinder head four-cycle engine burned gasses cannot escape cylinder until piston bottom its stroke exhaust valve opens Actually piston pushes burned gasses out exhaust returns top cylinder piston pulls new charge fuel air com bustion chamber descends cylin der second time compresses new charge ascends another power stroke fuel-air mixture ignited piston once reaches top cylinder up-down up-down movement piston time plug fires reason term four stroke cycle usually shortened four-cycle fourstroke also reason fuel goes engine burned powerand because explosion burning fuel contained occurs once two revolutions pro peller operation quiet comparison two-cycle engine two-cycle engine piston itself valve opens closes intake exhaust ports four-cycle must done different manner intake exhaust valves located head rather sleeve activated proper order cams geared crankshaft make four-cycle engine uses rotary type valves operated belt sys tems use pushrods both systems timing critical disassembly recommended pushrods work through rocker arms open close valves required posi tion piston few drops oil rocker arms after flying session very good idea fuel requirement fourcycle same two-cycle experts contrary skimp oil thing should done after initial break-in running period different two-cycle oper ation adjustment rocker arms After period time pushrods tend wear become slightly shorter rocker arm screw adjustment com pensates wear adjustment well covered manuals come engines along proper tools gauges complete task procedure simple after adjustment clear ances can checked gauges periodically assure engine per forming its peak Continued page 139 42 Model Aviation II 4 Direct Sales Only QAPLESS HiNGE SLOTTER Simplifies installation Gapless Hinges Makes Slois 4 Sizes Balsa E $250 24 insignia sheets also letters numbers 0 niajordecals available popular 40 -60 sizes plus American Giant Scale size believe majordeC8I5 have comprehensive assortment available now -with sizes styles coming time pressure sensitive water transfer WellbetthlslsOflellfle handing line.the complete line decals available model anywhere OCAG l love being handed major decals Os buos nqu es nv ed TEL 413 525 4110 CONTACT YOUR LOCAL HOBBY SHOP OR WRITE OIREIZT NORTHEAST SCREEN CRAPHICS 21 FISHER AVE. EAST LOOGMEADOW MA 01028 plugging airplane fly course youd need system inter changeable receiver crystals sides flying buddies might like thought youll have transmitter out impound area youre using fly could lead next solu tion still expensive Figure 4 shows 721 converter sold John Lange fully described construction article Receiving Converters RC Frequencies Model Aviation Feb ruary 1982 page 36 et seq John has sev eral versions item available might want contact him 1700 N 37th Ave Stone Park IL 60165 As know have attached discarded automobile radio use lot advantage rig can tune between RC channels thereby letting hear Com mercial Carrier stations live great help identifying inter ference sources John Lange DFC-at-large has donated couple built-up units AMA use AMA-sponsored contests have added some tape recordings ex plain use give exam ples kinds things might hear rapid education persons might use Figure 5 shows programmable scanner made Australian market scans new RC channels Jack Albrecht bought AMA trip ll Hershberger did some work improve little Both men members AMA frequency committee arent tunate have right kind men job unit kept AMA HQ used needed AMA competitions tape recording unit well Ive heard rumors Bearcat manu facturers scanners virtually thing considering making similar unit available US write ask may sooner George M Myers 70 Froehlich Farm Rd Hicksville NY 11801 Four-Cycle/Randolph Continued DaGe 42 Four-cycle engines have crankcase breathers As piston goes up down cylinder air must come go out crankcase breather provided al low action pressure tap tightly-cowled engine installation should vented outside squirt oil breather after flying session gives shaft bearings good lubrication ability turn larger efficient pro pellers reasonable speed tends offset somewhat less power developed four-cycle compared faster-revving two-stroker example 40 four-cycle easily turns 12-6 prop 8500 9000 rpm ability should especially appeal fly Scale airplanes large radial cowls summary state-of-the-art now stands four-cycle engine produces about 75% much power same size twocycle does half fuel ear one-fourth much noise noise rumble rather whine Recommended additional reading Small Gas Engines Paul Weissler Harper & Row About Small Gas Engines Jud Purvis Goodheart-Wilcox Diesel & High Compression Gas Engine Fundamentals Edgar J Kates American Technical Society Internal Combustion Engine Works David Urquhart Henry Z Walck Inc writing advertisers mention read about Model Aviation LI _____COMPLETE THIS FORM t1JE4SUEA MAILING uj\E7.LABEL FROM RECENT LET US KNOW WHERE YOU ARE GOING move please let US know advanceSIX weeks required change address Attach current MA mailing label check appropriate box mail Subscrip tion Dept Model AviatIon 1810 Samuel Morse Dr Reston VA 22090 Check appropriate boxenclose payment C NEW SUBSCRIPTION U CHANGE OF ADDRESS Non-AMA subscription rates $1800 12 months US possessions eisewhere Including Canada Mexico $2400 US Schools $900 US Libraries $1350 NAME ADDRESS CITY/STATf _______________________________________________ ZIP ________________ MODEL AVIATION 1810 SAMUEL MORSE DR RESTON VA 22090 May1984 139 FLYING NEAR AIRPORTS BE CAREFUL PROTECT YOUR RIGHT TO FLY Safe Flying No Accident
Edition: Model Aviation - 1984/05
Page Numbers: 40, 41, 42, 139
For sport flying trainer-type airplanes tour-cycle engine just cant topped quiet operation truly miserly fuel use throttle response extremely smooth high incredible slow idlejust whats needed perfect match airplane engine learning flier photo left shows Saito 45 Onestone July 1979 MAon right 05 FS-40 Onestep September 1981 MA Conga line has little common four-cycle model engine does have right rhythm author helps us get better ac quainted increasingly-popular quiet power plant L F Randolph _ne Three Ktck Above array tools provided four-ccle engines impressive good chance will never used manufacturers want make sure have needed Saito has built-in choke can operated outside cowl Right Engine mounts need little longer four-strokers because carb usually located rear Mounts rear-rotary engines work fine 05 comes drilling template mounting 40 Model Aviation %t e All engines should bench-run before mounting air planeespecially true four-cycles bit different run two-cycle best place get acquainted test stand instance cant lean Out four-cycle two-cycle can tell needle set exhaust sound glow plug worthy mention follow manufacturers advice because wrong plug can make big difference performance Right Thats breather backplate pressure tap fuel-air mixture does pass through crankcase afour-cycletherefore piston goes up down breather provides pressure relief lubrication crankshaft bearing receives oil slips piston crankcase shot two Marvel Mystery Oil through breather after flying session will add life engine photos author RC FLYING IS done hearing well seeing Before flight starts tuning engine done sound air sound throttle being retarded engine going lean lugging heard before visual indication given controls moved compensate same time fool ourselves sound hear recording model airplane engine surprised high thin noise comes outand usually blame effect poor recording Actually equipment correct brain translates pops roar airplane flying Unfortunately hobby-sport have such translator engines sound like recording dependence sound reason first flights four-cycle-enginepowered airplane surprise en gine just doesnt sound though run ning fast enough fly airplane after ground run twice long necessary airplane flying well feeling still persists takes quite few flights round loops good vertical figures realize power sound really realistic before Sound therefore real importance us fliers well public case public term noise rather sound four-cycle engine RC aircraft may well answer pleases both bonus flying time gallon rather expensive fuel two-cycle engine have long used airplanes very remarkable powerful machine has brought near perfection yet still sends nearly much fuel out exhaust stack actually burns cylinder operation two-cycle engine such exhaust Continued page 42 Some four-cycle engines have open pushrods valve lifters rocker arms fly dusty conditions valve pushrod covers best bet little oil after flying well worth considering After four-cycle engine has run may necessary adlust rocker arms because pushrod wear righthand photo As necessary amount play between rocker arm valve gauges supplied check play thanks World Engines Hobby Shack supplying engines used report May 1984 41 New Four Laser PRECISION BUILT MODELS AND KITS INTRODUCES VERSATILITY IN KIT Turn Around Pattern Stand Off Scale Fun Fly Events /e Scale Kit Includes 7 8 lbs Wing Span Wing Area sq Plug Wings Removeable Tail Assembly Tune Pipe fits inside fuse Wood Construction Foam Wings Complete Kit Epoxyglass Cowl & Wheelpants Formed Landing Gear Small Parts Recommended Engines 60 90 12 Cu Designed G L C airplane cover competitive needs Extensively tested top pattern flyer PRECISION BUILT MODELS & KITS 1818 6th Ave W Bradenton Fl 33505 813 747-7006 GIANT SCALE ACCESSORIESVCO MODEL SuppIies Three New Cockpits1885 Dyson St Muskegon MI 49442 A61VI5 Zero Kit features 20 molded pieces gunsight two machine gun breecha instrument panel Sidewalls seat vac-u-formed fit Platt Scale Flight$2595 Kit includes exhaust impingement plates detailed oil ZERO EXTERIOR KIT cooler scope wing blister used shell exhaust ports $1095 molded cockpit parts include tiny scale switches quadrants control leavers instrument panel Instrument faces clear Itwol color reroduction Seat vac-u-formed V scale fit BarronsBryons$21 features molded K-14a gunsight cockpit complete detail includes instrument panel sidewalls seat Also included complete placard shetlIO scale fit Scale_____$2195 5001 Samba ISaltablaar 116 scala$550 eachAM $275 aIlqsliug heading 10001 Samba ISaitabla far I/Sari/b acala teen$750 eachStamp far catalag K 9 ATTENTION MANUFACTURERS would like forming work Send pattern samples quotes Still Using bid Fashioned Wing Hinges will gain Control efficiency eliminating gap between moveable .nd stationary control surfaces will amazed performance gained using simple inexpen sive improvementl FREE MOVEMENT 450 STRONG AND LIGHTWEIGHT COMPLETELY FUELPROOF COMPATABLE WITH ALL IRON-ON MATERIALS COMES IN FT LENGTHS SMALL lit ORPRICE 3 ft $250 LARGE I/A EASY TO INSTALL 1 SUE ND ESAR RY ACGVqPR ALONG ENTAPE JOINT FOR ADDITIONAL SEWRITI sERT SMALL RN EVERY FEW HES CUT OFF FLUSH FILL AND SAND AS NEEDED FOR FINISHING Send Free info fine products FOURMOST PRODUCTS 4040 24th Avenue Forest Grove OR 97116 CUT 1/4 DEEP SLIT ALLRIO TIE FULL LENGTH O THE MATALG SURFACES port opened descending piston gasified fuel still burning part burning takes place outside cylinder Like report pistol bullet has left barrel noise generated short tme later intake port opened piston its way down fresh charge fuel pushed cylinder compression fuel-air mixture crankcase Some fresh charge also goes out still-open exhaust port burning fuel-air mixture occurs cylinder head four-cycle engine burned gasses cannot escape cylinder until piston bottom its stroke exhaust valve opens Actually piston pushes burned gasses out exhaust returns top cylinder piston pulls new charge fuel air com bustion chamber descends cylin der second time compresses new charge ascends another power stroke fuel-air mixture ignited piston once reaches top cylinder up-down up-down movement piston time plug fires reason term four stroke cycle usually shortened four-cycle fourstroke also reason fuel goes engine burned powerand because explosion burning fuel contained occurs once two revolutions pro peller operation quiet comparison two-cycle engine two-cycle engine piston itself valve opens closes intake exhaust ports four-cycle must done different manner intake exhaust valves located head rather sleeve activated proper order cams geared crankshaft make four-cycle engine uses rotary type valves operated belt sys tems use pushrods both systems timing critical disassembly recommended pushrods work through rocker arms open close valves required posi tion piston few drops oil rocker arms after flying session very good idea fuel requirement fourcycle same two-cycle experts contrary skimp oil thing should done after initial break-in running period different two-cycle oper ation adjustment rocker arms After period time pushrods tend wear become slightly shorter rocker arm screw adjustment com pensates wear adjustment well covered manuals come engines along proper tools gauges complete task procedure simple after adjustment clear ances can checked gauges periodically assure engine per forming its peak Continued page 139 42 Model Aviation II 4 Direct Sales Only QAPLESS HiNGE SLOTTER Simplifies installation Gapless Hinges Makes Slois 4 Sizes Balsa E $250 24 insignia sheets also letters numbers 0 niajordecals available popular 40 -60 sizes plus American Giant Scale size believe majordeC8I5 have comprehensive assortment available now -with sizes styles coming time pressure sensitive water transfer WellbetthlslsOflellfle handing line.the complete line decals available model anywhere OCAG l love being handed major decals Os buos nqu es nv ed TEL 413 525 4110 CONTACT YOUR LOCAL HOBBY SHOP OR WRITE OIREIZT NORTHEAST SCREEN CRAPHICS 21 FISHER AVE. EAST LOOGMEADOW MA 01028 plugging airplane fly course youd need system inter changeable receiver crystals sides flying buddies might like thought youll have transmitter out impound area youre using fly could lead next solu tion still expensive Figure 4 shows 721 converter sold John Lange fully described construction article Receiving Converters RC Frequencies Model Aviation Feb ruary 1982 page 36 et seq John has sev eral versions item available might want contact him 1700 N 37th Ave Stone Park IL 60165 As know have attached discarded automobile radio use lot advantage rig can tune between RC channels thereby letting hear Com mercial Carrier stations live great help identifying inter ference sources John Lange DFC-at-large has donated couple built-up units AMA use AMA-sponsored contests have added some tape recordings ex plain use give exam ples kinds things might hear rapid education persons might use Figure 5 shows programmable scanner made Australian market scans new RC channels Jack Albrecht bought AMA trip ll Hershberger did some work improve little Both men members AMA frequency committee arent tunate have right kind men job unit kept AMA HQ used needed AMA competitions tape recording unit well Ive heard rumors Bearcat manu facturers scanners virtually thing considering making similar unit available US write ask may sooner George M Myers 70 Froehlich Farm Rd Hicksville NY 11801 Four-Cycle/Randolph Continued DaGe 42 Four-cycle engines have crankcase breathers As piston goes up down cylinder air must come go out crankcase breather provided al low action pressure tap tightly-cowled engine installation should vented outside squirt oil breather after flying session gives shaft bearings good lubrication ability turn larger efficient pro pellers reasonable speed tends offset somewhat less power developed four-cycle compared faster-revving two-stroker example 40 four-cycle easily turns 12-6 prop 8500 9000 rpm ability should especially appeal fly Scale airplanes large radial cowls summary state-of-the-art now stands four-cycle engine produces about 75% much power same size twocycle does half fuel ear one-fourth much noise noise rumble rather whine Recommended additional reading Small Gas Engines Paul Weissler Harper & Row About Small Gas Engines Jud Purvis Goodheart-Wilcox Diesel & High Compression Gas Engine Fundamentals Edgar J Kates American Technical Society Internal Combustion Engine Works David Urquhart Henry Z Walck Inc writing advertisers mention read about Model Aviation LI _____COMPLETE THIS FORM t1JE4SUEA MAILING uj\E7.LABEL FROM RECENT LET US KNOW WHERE YOU ARE GOING move please let US know advanceSIX weeks required change address Attach current MA mailing label check appropriate box mail Subscrip tion Dept Model AviatIon 1810 Samuel Morse Dr Reston VA 22090 Check appropriate boxenclose payment C NEW SUBSCRIPTION U CHANGE OF ADDRESS Non-AMA subscription rates $1800 12 months US possessions eisewhere Including Canada Mexico $2400 US Schools $900 US Libraries $1350 NAME ADDRESS CITY/STATf _______________________________________________ ZIP ________________ MODEL AVIATION 1810 SAMUEL MORSE DR RESTON VA 22090 May1984 139 FLYING NEAR AIRPORTS BE CAREFUL PROTECT YOUR RIGHT TO FLY Safe Flying No Accident
Edition: Model Aviation - 1984/05
Page Numbers: 40, 41, 42, 139
For sport flying trainer-type airplanes tour-cycle engine just cant topped quiet operation truly miserly fuel use throttle response extremely smooth high incredible slow idlejust whats needed perfect match airplane engine learning flier photo left shows Saito 45 Onestone July 1979 MAon right 05 FS-40 Onestep September 1981 MA Conga line has little common four-cycle model engine does have right rhythm author helps us get better ac quainted increasingly-popular quiet power plant L F Randolph _ne Three Ktck Above array tools provided four-ccle engines impressive good chance will never used manufacturers want make sure have needed Saito has built-in choke can operated outside cowl Right Engine mounts need little longer four-strokers because carb usually located rear Mounts rear-rotary engines work fine 05 comes drilling template mounting 40 Model Aviation %t e All engines should bench-run before mounting air planeespecially true four-cycles bit different run two-cycle best place get acquainted test stand instance cant lean Out four-cycle two-cycle can tell needle set exhaust sound glow plug worthy mention follow manufacturers advice because wrong plug can make big difference performance Right Thats breather backplate pressure tap fuel-air mixture does pass through crankcase afour-cycletherefore piston goes up down breather provides pressure relief lubrication crankshaft bearing receives oil slips piston crankcase shot two Marvel Mystery Oil through breather after flying session will add life engine photos author RC FLYING IS done hearing well seeing Before flight starts tuning engine done sound air sound throttle being retarded engine going lean lugging heard before visual indication given controls moved compensate same time fool ourselves sound hear recording model airplane engine surprised high thin noise comes outand usually blame effect poor recording Actually equipment correct brain translates pops roar airplane flying Unfortunately hobby-sport have such translator engines sound like recording dependence sound reason first flights four-cycle-enginepowered airplane surprise en gine just doesnt sound though run ning fast enough fly airplane after ground run twice long necessary airplane flying well feeling still persists takes quite few flights round loops good vertical figures realize power sound really realistic before Sound therefore real importance us fliers well public case public term noise rather sound four-cycle engine RC aircraft may well answer pleases both bonus flying time gallon rather expensive fuel two-cycle engine have long used airplanes very remarkable powerful machine has brought near perfection yet still sends nearly much fuel out exhaust stack actually burns cylinder operation two-cycle engine such exhaust Continued page 42 Some four-cycle engines have open pushrods valve lifters rocker arms fly dusty conditions valve pushrod covers best bet little oil after flying well worth considering After four-cycle engine has run may necessary adlust rocker arms because pushrod wear righthand photo As necessary amount play between rocker arm valve gauges supplied check play thanks World Engines Hobby Shack supplying engines used report May 1984 41 New Four Laser PRECISION BUILT MODELS AND KITS INTRODUCES VERSATILITY IN KIT Turn Around Pattern Stand Off Scale Fun Fly Events /e Scale Kit Includes 7 8 lbs Wing Span Wing Area sq Plug Wings Removeable Tail Assembly Tune Pipe fits inside fuse Wood Construction Foam Wings Complete Kit Epoxyglass Cowl & Wheelpants Formed Landing Gear Small Parts Recommended Engines 60 90 12 Cu Designed G L C airplane cover competitive needs Extensively tested top pattern flyer PRECISION BUILT MODELS & KITS 1818 6th Ave W Bradenton Fl 33505 813 747-7006 GIANT SCALE ACCESSORIESVCO MODEL SuppIies Three New Cockpits1885 Dyson St Muskegon MI 49442 A61VI5 Zero Kit features 20 molded pieces gunsight two machine gun breecha instrument panel Sidewalls seat vac-u-formed fit Platt Scale Flight$2595 Kit includes exhaust impingement plates detailed oil ZERO EXTERIOR KIT cooler scope wing blister used shell exhaust ports $1095 molded cockpit parts include tiny scale switches quadrants control leavers instrument panel Instrument faces clear Itwol color reroduction Seat vac-u-formed V scale fit BarronsBryons$21 features molded K-14a gunsight cockpit complete detail includes instrument panel sidewalls seat Also included complete placard shetlIO scale fit Scale_____$2195 5001 Samba ISaltablaar 116 scala$550 eachAM $275 aIlqsliug heading 10001 Samba ISaitabla far I/Sari/b acala teen$750 eachStamp far catalag K 9 ATTENTION MANUFACTURERS would like forming work Send pattern samples quotes Still Using bid Fashioned Wing Hinges will gain Control efficiency eliminating gap between moveable .nd stationary control surfaces will amazed performance gained using simple inexpen sive improvementl FREE MOVEMENT 450 STRONG AND LIGHTWEIGHT COMPLETELY FUELPROOF COMPATABLE WITH ALL IRON-ON MATERIALS COMES IN FT LENGTHS SMALL lit ORPRICE 3 ft $250 LARGE I/A EASY TO INSTALL 1 SUE ND ESAR RY ACGVqPR ALONG ENTAPE JOINT FOR ADDITIONAL SEWRITI sERT SMALL RN EVERY FEW HES CUT OFF FLUSH FILL AND SAND AS NEEDED FOR FINISHING Send Free info fine products FOURMOST PRODUCTS 4040 24th Avenue Forest Grove OR 97116 CUT 1/4 DEEP SLIT ALLRIO TIE FULL LENGTH O THE MATALG SURFACES port opened descending piston gasified fuel still burning part burning takes place outside cylinder Like report pistol bullet has left barrel noise generated short tme later intake port opened piston its way down fresh charge fuel pushed cylinder compression fuel-air mixture crankcase Some fresh charge also goes out still-open exhaust port burning fuel-air mixture occurs cylinder head four-cycle engine burned gasses cannot escape cylinder until piston bottom its stroke exhaust valve opens Actually piston pushes burned gasses out exhaust returns top cylinder piston pulls new charge fuel air com bustion chamber descends cylin der second time compresses new charge ascends another power stroke fuel-air mixture ignited piston once reaches top cylinder up-down up-down movement piston time plug fires reason term four stroke cycle usually shortened four-cycle fourstroke also reason fuel goes engine burned powerand because explosion burning fuel contained occurs once two revolutions pro peller operation quiet comparison two-cycle engine two-cycle engine piston itself valve opens closes intake exhaust ports four-cycle must done different manner intake exhaust valves located head rather sleeve activated proper order cams geared crankshaft make four-cycle engine uses rotary type valves operated belt sys tems use pushrods both systems timing critical disassembly recommended pushrods work through rocker arms open close valves required posi tion piston few drops oil rocker arms after flying session very good idea fuel requirement fourcycle same two-cycle experts contrary skimp oil thing should done after initial break-in running period different two-cycle oper ation adjustment rocker arms After period time pushrods tend wear become slightly shorter rocker arm screw adjustment com pensates wear adjustment well covered manuals come engines along proper tools gauges complete task procedure simple after adjustment clear ances can checked gauges periodically assure engine per forming its peak Continued page 139 42 Model Aviation II 4 Direct Sales Only QAPLESS HiNGE SLOTTER Simplifies installation Gapless Hinges Makes Slois 4 Sizes Balsa E $250 24 insignia sheets also letters numbers 0 niajordecals available popular 40 -60 sizes plus American Giant Scale size believe majordeC8I5 have comprehensive assortment available now -with sizes styles coming time pressure sensitive water transfer WellbetthlslsOflellfle handing line.the complete line decals available model anywhere OCAG l love being handed major decals Os buos nqu es nv ed TEL 413 525 4110 CONTACT YOUR LOCAL HOBBY SHOP OR WRITE OIREIZT NORTHEAST SCREEN CRAPHICS 21 FISHER AVE. EAST LOOGMEADOW MA 01028 plugging airplane fly course youd need system inter changeable receiver crystals sides flying buddies might like thought youll have transmitter out impound area youre using fly could lead next solu tion still expensive Figure 4 shows 721 converter sold John Lange fully described construction article Receiving Converters RC Frequencies Model Aviation Feb ruary 1982 page 36 et seq John has sev eral versions item available might want contact him 1700 N 37th Ave Stone Park IL 60165 As know have attached discarded automobile radio use lot advantage rig can tune between RC channels thereby letting hear Com mercial Carrier stations live great help identifying inter ference sources John Lange DFC-at-large has donated couple built-up units AMA use AMA-sponsored contests have added some tape recordings ex plain use give exam ples kinds things might hear rapid education persons might use Figure 5 shows programmable scanner made Australian market scans new RC channels Jack Albrecht bought AMA trip ll Hershberger did some work improve little Both men members AMA frequency committee arent tunate have right kind men job unit kept AMA HQ used needed AMA competitions tape recording unit well Ive heard rumors Bearcat manu facturers scanners virtually thing considering making similar unit available US write ask may sooner George M Myers 70 Froehlich Farm Rd Hicksville NY 11801 Four-Cycle/Randolph Continued DaGe 42 Four-cycle engines have crankcase breathers As piston goes up down cylinder air must come go out crankcase breather provided al low action pressure tap tightly-cowled engine installation should vented outside squirt oil breather after flying session gives shaft bearings good lubrication ability turn larger efficient pro pellers reasonable speed tends offset somewhat less power developed four-cycle compared faster-revving two-stroker example 40 four-cycle easily turns 12-6 prop 8500 9000 rpm ability should especially appeal fly Scale airplanes large radial cowls summary state-of-the-art now stands four-cycle engine produces about 75% much power same size twocycle does half fuel ear one-fourth much noise noise rumble rather whine Recommended additional reading Small Gas Engines Paul Weissler Harper & Row About Small Gas Engines Jud Purvis Goodheart-Wilcox Diesel & High Compression Gas Engine Fundamentals Edgar J Kates American Technical Society Internal Combustion Engine Works David Urquhart Henry Z Walck Inc writing advertisers mention read about Model Aviation LI _____COMPLETE THIS FORM t1JE4SUEA MAILING uj\E7.LABEL FROM RECENT LET US KNOW WHERE YOU ARE GOING move please let US know advanceSIX weeks required change address Attach current MA mailing label check appropriate box mail Subscrip tion Dept Model AviatIon 1810 Samuel Morse Dr Reston VA 22090 Check appropriate boxenclose payment C NEW SUBSCRIPTION U CHANGE OF ADDRESS Non-AMA subscription rates $1800 12 months US possessions eisewhere Including Canada Mexico $2400 US Schools $900 US Libraries $1350 NAME ADDRESS CITY/STATf _______________________________________________ ZIP ________________ MODEL AVIATION 1810 SAMUEL MORSE DR RESTON VA 22090 May1984 139 FLYING NEAR AIRPORTS BE CAREFUL PROTECT YOUR RIGHT TO FLY Safe Flying No Accident