56 Model Aviation BE CONVERT few columns back featured some homemade engines John Morrill John able successfully construct engines because skill machinist having access proper machine tools us have necessary skills equipment build own engine would still like try hand engine work Hans Ochsner 4699 Lake George Road Metamora Michigan 48455 has producing successful engine conversions glo ignition using basic tools Before delve details engine conversion let us review essentials wire witn terminal leading spark ignition systems getting bogged plug spark plug itself nothing down heavy theory insulated electrode grounded Coils oonsist iron core wrapped electrode having specific gap conden relatively few turns heavy copper ser essentially two conductive plates wire terminals end Around separated insulation terminals wrapped turns fine oopper plate ignition points nothing mechanically operated switch opera tion power source 3 volts DC connected between ground side coil primary other primary coil terminal connected insulated side points other point grounded points close current flows builds magnetic field coil primary points open field collapses across windings secondary coil inducing high voltage current flows spark plug jumps gap ground firing fuel mixture condenser connected across primary ground condenser acts sort like shock absorber aids instantaneous collapse secondary field over simplification perhaps does convey basic principle considering engine purposes conversion some consideration its intended use timely competition flying ultimate goal selecting displacement near upper limit particular class advisable Keep mind displacement limits conversions lower given class original engines example Class B allows 30 cu original engine against 25 conver sion Also conversions limited con ventional ported loop-scavenged engines means no Schnuerle engines least competition engine selected should have reliable running easy start ing characteristics Hans has used mainly McCoys Enyas although OS old series K&B engines green heads work well Basically engine conversion consists 5 steps 1 Obtain suitable points 2 Modify crankcase accept ignition timer point assembly 3 Fabricate timer body 4 Provide cam operate points 5 Time cam engine basic criteria selection suitable ignition points durability size smaller better expense quality Point assemblies adapted other model airplane engines good bets probability would difficult find next best alternative would adapting points small commercial engines Chainsaw points Homelite Rem ington McCullogh etc excellent some imported motorcycle small automobile points Another option fabricate own using contacts salvaged telephone relays similar electrical equipment Choice also somewhat limited own mechanical abilities probability will have compromise somewhat size bulk suggested points larger old-time engine parts Continued page 122 Three home grown conversions Hans Oclis ner Hand-made timer embodies empty slot clamp regulate ease adjustment Points pivot brass tube pressed timer body Insulated side points isclearly visible Flat spot cam hand-filed polished re duce friction June1979 57 Various timer assemblies illustrate methods mounting fixed contact point well securing insulating movable point Spark adjustment consists tubing machine screw Shape timer body mainly dictated size mounting hole size point assembly EAA members receive SPORT VIA TION magazine ANNUAL DUES $2500 FOR FREE BROCHURE WRITE EXPERIMENTAL AIRCRAFT EA ASSOCIATION INC PO Box 229-A Hales Corners Wisconsin 53130 ial T AIRCRAFT YOU CAN BUILD pp XPERIMENI E AIR CRAFT ASSOCIATION issue Homebuilders Corner ers Editor Hot Line Headquarters Oshkosh Countdown Headquarters Comment fits EAAs Divisions tplane Builder tsmans Corner Building Line Past Members Building 25 Years Ago Out Geometry Differential Belicrank Stroke Engine Today Chapters Action cs Fury N27MS November Two Seven Mike Sally Racer on Accent a-Light Noneybee bergh Commemorative Tour ress Report No 10 Board Directors Meeting Calendar Events ington Report non-subscribers So rules 1 The balsa permitted 3 6 piece ordinary 1/32 sheetno special Indoor stock covering must done 12 X 12 piece ordinary Japanese tissueno superlight pre-war superfine similar stuff 2 Use wire plastic teflon rubber steel aluminum lead dope glue plasticene fiberglass desire 3 You may use styrofoam condenser paper helium hydrogen microfilm ad ditional balsa tissue 4 Model may size configura tion rubber powered hand launched 5 You must give model name supply simple set plans 6 No cheating allowed 7 Models cannot returned Prizes offered best duration unique unusual model best work manship Models must mailed Earl VanGorder 10 Brothers Road Wappin gem Falls NY 12590 before third Thursday January Characteristically models entered take few hours build can build two once have mind little time returning contes tants isnt really worth hassle After contest winners displayed largest local hobby shop others go beginners groups local schools teachers use demonstration students copy learn few tricks What better end Models range ridiculous quite Super-duration models can built within rules cutting wood narrow strips ribs spars tips using wider strips build hollowbox motor stick assembling scaled-down Easy B Pennyplane-type model something other end scale see photo Bill Warners Flying Man inspired 1909 French cartoon titled men become birds birds become men Let imagination wander list entrants winners will sent participants will appear column Bob Meuser 4200 Gregory St Oak land CA 94619 FF Old Timers/Haught continued page 57 Size selected point assembly will also affect mounting engine available space front crank case ahead intake port area will probably need truing up provide smooth round surface timer assembly best accomplished lathe keeping mind minimum machine tool operation other methods available Hans suggests simple tool made bolt half ofa lock washer requires welding brazing service should available local fix shop Try finished diameter close standard drill size simpliI fabrication timer body timer body itself probably appears formidable component make entire conversion project However part can hand produced evening drilling sawing filing tapping threads Aluminum bar stock piece old automotive distributor housing piece old flywheel housing drawings photos give idea drilled hole fit crankcase forms basis work slot clamp screw provide adjustable friction timer body Beyond need spark ad vance lever point pivot spring support stationary point mount point pivot can brass tube pressed hole spark advance lever can long screw spring support stationary point mount can attached screws should integral part timer body cutting filing statio nary point grounded spring mount point will need insulated fiber washers etc required cam can usually made modifying original prop drive washer drawing illustrates several types Basi cally cam consists round surface has lowered portion approxi mately 1/4 90 degrees circumference equal desired point gap 122 Model Aviation about U1U18 low spot con trols duration points closed dwell allowing build up current circuit coil few drive washers simply lend themselves modi fication case suitable drive washercam will have fabricated Prior cutting cam drop install timer assembly engine position timer desired retarded position primar ily determined convenience keeping mind timer will advanced turned against crankshaft rotation engine running approximately 15 40 degrees Rotate crankshaft until piston top dead center Now back off 10 degrees against normal rotation posi tion points should crack open Make suitable marks will guide cutting cam drop will necessary insure cam will reinstalled same position time removed engine has drive washer-cain single flat no problem have double flat splines suitable mark will suffice However engine has tapered drive washer seat will need keyed shaft best accomplished drilling hole parallel shaft half hole crankshaft half cam installing music wire pin point little tinkering engine should ready run con verted glow engines little cantankerous start Hans suggests use electric starter Clarence Haught Route 5 Box 16 Coeur dAlene ID 83814 FF Sport/Scale/Warner continued page 69 FAC Thompson Trophy Races several planes launched time first plane down being eliminated repeated over over until plane winner remains past mid-winter contest has attracted contestants far Connecticut Missouri Philadelphia year no exception hardy group FACers journeying Philadelphia other points out side Washington metropolitan area Some 94 aircraft entered events 29 modelers including seven Juniors Both new events added year Navy Scale Spanish Fly Combat popular Navy Scale interesting because variety aircraft Designs covered spectrum earliest days Naval Aviation history represented Cox Submarine Scout World War II represented Navy Scale winner Les Kings Grumman Bearcat see nine colorful Navy jobs cruising around same time almost too much take P-Nut Scale attracted largest turnout 21 entries Dave Rees picked up well-deserved first place immaculate Corona Cougar Ju nior P-Nut saw seven entries Greg Leffler winning first Luton Major FAC Scale produced 17 aircraft Allan Schanzles pretty Tiger Moth Hi-Flyer kit tops 56 pos sible 62 points FAC bonus point system unusual designs proved Allans undoing since two low-wing ca nard pushers Don Srulls Shinden George Meyers Vari-Viggen received 40 points bonus Since both topped 30 seconds easily cold hangar questions wisdom too bonus points Don Srull won first point Junior FAC Scale produced two-way tie first between Brian Gerstenberg Mike Escalante World War Combat produced 10 en tries ranging Pat Dailys Rumpler C-IV Stew Meyers Fokker Fill final rematch last years final ists Don Srulls DH-6 pitted against George Meyers Siemens Mono plane year Georges turn win No-Cal won Don Srulls super June1979 123 As can see converting engine simple task rewarding challenge purpose discussion certainly take away engine conversion business anything should support fact earn money
Edition: Model Aviation - 1979/06
Page Numbers: 56, 57, 122, 123
56 Model Aviation BE CONVERT few columns back featured some homemade engines John Morrill John able successfully construct engines because skill machinist having access proper machine tools us have necessary skills equipment build own engine would still like try hand engine work Hans Ochsner 4699 Lake George Road Metamora Michigan 48455 has producing successful engine conversions glo ignition using basic tools Before delve details engine conversion let us review essentials wire witn terminal leading spark ignition systems getting bogged plug spark plug itself nothing down heavy theory insulated electrode grounded Coils oonsist iron core wrapped electrode having specific gap conden relatively few turns heavy copper ser essentially two conductive plates wire terminals end Around separated insulation terminals wrapped turns fine oopper plate ignition points nothing mechanically operated switch opera tion power source 3 volts DC connected between ground side coil primary other primary coil terminal connected insulated side points other point grounded points close current flows builds magnetic field coil primary points open field collapses across windings secondary coil inducing high voltage current flows spark plug jumps gap ground firing fuel mixture condenser connected across primary ground condenser acts sort like shock absorber aids instantaneous collapse secondary field over simplification perhaps does convey basic principle considering engine purposes conversion some consideration its intended use timely competition flying ultimate goal selecting displacement near upper limit particular class advisable Keep mind displacement limits conversions lower given class original engines example Class B allows 30 cu original engine against 25 conver sion Also conversions limited con ventional ported loop-scavenged engines means no Schnuerle engines least competition engine selected should have reliable running easy start ing characteristics Hans has used mainly McCoys Enyas although OS old series K&B engines green heads work well Basically engine conversion consists 5 steps 1 Obtain suitable points 2 Modify crankcase accept ignition timer point assembly 3 Fabricate timer body 4 Provide cam operate points 5 Time cam engine basic criteria selection suitable ignition points durability size smaller better expense quality Point assemblies adapted other model airplane engines good bets probability would difficult find next best alternative would adapting points small commercial engines Chainsaw points Homelite Rem ington McCullogh etc excellent some imported motorcycle small automobile points Another option fabricate own using contacts salvaged telephone relays similar electrical equipment Choice also somewhat limited own mechanical abilities probability will have compromise somewhat size bulk suggested points larger old-time engine parts Continued page 122 Three home grown conversions Hans Oclis ner Hand-made timer embodies empty slot clamp regulate ease adjustment Points pivot brass tube pressed timer body Insulated side points isclearly visible Flat spot cam hand-filed polished re duce friction June1979 57 Various timer assemblies illustrate methods mounting fixed contact point well securing insulating movable point Spark adjustment consists tubing machine screw Shape timer body mainly dictated size mounting hole size point assembly EAA members receive SPORT VIA TION magazine ANNUAL DUES $2500 FOR FREE BROCHURE WRITE EXPERIMENTAL AIRCRAFT EA ASSOCIATION INC PO Box 229-A Hales Corners Wisconsin 53130 ial T AIRCRAFT YOU CAN BUILD pp XPERIMENI E AIR CRAFT ASSOCIATION issue Homebuilders Corner ers Editor Hot Line Headquarters Oshkosh Countdown Headquarters Comment fits EAAs Divisions tplane Builder tsmans Corner Building Line Past Members Building 25 Years Ago Out Geometry Differential Belicrank Stroke Engine Today Chapters Action cs Fury N27MS November Two Seven Mike Sally Racer on Accent a-Light Noneybee bergh Commemorative Tour ress Report No 10 Board Directors Meeting Calendar Events ington Report non-subscribers So rules 1 The balsa permitted 3 6 piece ordinary 1/32 sheetno special Indoor stock covering must done 12 X 12 piece ordinary Japanese tissueno superlight pre-war superfine similar stuff 2 Use wire plastic teflon rubber steel aluminum lead dope glue plasticene fiberglass desire 3 You may use styrofoam condenser paper helium hydrogen microfilm ad ditional balsa tissue 4 Model may size configura tion rubber powered hand launched 5 You must give model name supply simple set plans 6 No cheating allowed 7 Models cannot returned Prizes offered best duration unique unusual model best work manship Models must mailed Earl VanGorder 10 Brothers Road Wappin gem Falls NY 12590 before third Thursday January Characteristically models entered take few hours build can build two once have mind little time returning contes tants isnt really worth hassle After contest winners displayed largest local hobby shop others go beginners groups local schools teachers use demonstration students copy learn few tricks What better end Models range ridiculous quite Super-duration models can built within rules cutting wood narrow strips ribs spars tips using wider strips build hollowbox motor stick assembling scaled-down Easy B Pennyplane-type model something other end scale see photo Bill Warners Flying Man inspired 1909 French cartoon titled men become birds birds become men Let imagination wander list entrants winners will sent participants will appear column Bob Meuser 4200 Gregory St Oak land CA 94619 FF Old Timers/Haught continued page 57 Size selected point assembly will also affect mounting engine available space front crank case ahead intake port area will probably need truing up provide smooth round surface timer assembly best accomplished lathe keeping mind minimum machine tool operation other methods available Hans suggests simple tool made bolt half ofa lock washer requires welding brazing service should available local fix shop Try finished diameter close standard drill size simpliI fabrication timer body timer body itself probably appears formidable component make entire conversion project However part can hand produced evening drilling sawing filing tapping threads Aluminum bar stock piece old automotive distributor housing piece old flywheel housing drawings photos give idea drilled hole fit crankcase forms basis work slot clamp screw provide adjustable friction timer body Beyond need spark ad vance lever point pivot spring support stationary point mount point pivot can brass tube pressed hole spark advance lever can long screw spring support stationary point mount can attached screws should integral part timer body cutting filing statio nary point grounded spring mount point will need insulated fiber washers etc required cam can usually made modifying original prop drive washer drawing illustrates several types Basi cally cam consists round surface has lowered portion approxi mately 1/4 90 degrees circumference equal desired point gap 122 Model Aviation about U1U18 low spot con trols duration points closed dwell allowing build up current circuit coil few drive washers simply lend themselves modi fication case suitable drive washercam will have fabricated Prior cutting cam drop install timer assembly engine position timer desired retarded position primar ily determined convenience keeping mind timer will advanced turned against crankshaft rotation engine running approximately 15 40 degrees Rotate crankshaft until piston top dead center Now back off 10 degrees against normal rotation posi tion points should crack open Make suitable marks will guide cutting cam drop will necessary insure cam will reinstalled same position time removed engine has drive washer-cain single flat no problem have double flat splines suitable mark will suffice However engine has tapered drive washer seat will need keyed shaft best accomplished drilling hole parallel shaft half hole crankshaft half cam installing music wire pin point little tinkering engine should ready run con verted glow engines little cantankerous start Hans suggests use electric starter Clarence Haught Route 5 Box 16 Coeur dAlene ID 83814 FF Sport/Scale/Warner continued page 69 FAC Thompson Trophy Races several planes launched time first plane down being eliminated repeated over over until plane winner remains past mid-winter contest has attracted contestants far Connecticut Missouri Philadelphia year no exception hardy group FACers journeying Philadelphia other points out side Washington metropolitan area Some 94 aircraft entered events 29 modelers including seven Juniors Both new events added year Navy Scale Spanish Fly Combat popular Navy Scale interesting because variety aircraft Designs covered spectrum earliest days Naval Aviation history represented Cox Submarine Scout World War II represented Navy Scale winner Les Kings Grumman Bearcat see nine colorful Navy jobs cruising around same time almost too much take P-Nut Scale attracted largest turnout 21 entries Dave Rees picked up well-deserved first place immaculate Corona Cougar Ju nior P-Nut saw seven entries Greg Leffler winning first Luton Major FAC Scale produced 17 aircraft Allan Schanzles pretty Tiger Moth Hi-Flyer kit tops 56 pos sible 62 points FAC bonus point system unusual designs proved Allans undoing since two low-wing ca nard pushers Don Srulls Shinden George Meyers Vari-Viggen received 40 points bonus Since both topped 30 seconds easily cold hangar questions wisdom too bonus points Don Srull won first point Junior FAC Scale produced two-way tie first between Brian Gerstenberg Mike Escalante World War Combat produced 10 en tries ranging Pat Dailys Rumpler C-IV Stew Meyers Fokker Fill final rematch last years final ists Don Srulls DH-6 pitted against George Meyers Siemens Mono plane year Georges turn win No-Cal won Don Srulls super June1979 123 As can see converting engine simple task rewarding challenge purpose discussion certainly take away engine conversion business anything should support fact earn money
Edition: Model Aviation - 1979/06
Page Numbers: 56, 57, 122, 123
56 Model Aviation BE CONVERT few columns back featured some homemade engines John Morrill John able successfully construct engines because skill machinist having access proper machine tools us have necessary skills equipment build own engine would still like try hand engine work Hans Ochsner 4699 Lake George Road Metamora Michigan 48455 has producing successful engine conversions glo ignition using basic tools Before delve details engine conversion let us review essentials wire witn terminal leading spark ignition systems getting bogged plug spark plug itself nothing down heavy theory insulated electrode grounded Coils oonsist iron core wrapped electrode having specific gap conden relatively few turns heavy copper ser essentially two conductive plates wire terminals end Around separated insulation terminals wrapped turns fine oopper plate ignition points nothing mechanically operated switch opera tion power source 3 volts DC connected between ground side coil primary other primary coil terminal connected insulated side points other point grounded points close current flows builds magnetic field coil primary points open field collapses across windings secondary coil inducing high voltage current flows spark plug jumps gap ground firing fuel mixture condenser connected across primary ground condenser acts sort like shock absorber aids instantaneous collapse secondary field over simplification perhaps does convey basic principle considering engine purposes conversion some consideration its intended use timely competition flying ultimate goal selecting displacement near upper limit particular class advisable Keep mind displacement limits conversions lower given class original engines example Class B allows 30 cu original engine against 25 conver sion Also conversions limited con ventional ported loop-scavenged engines means no Schnuerle engines least competition engine selected should have reliable running easy start ing characteristics Hans has used mainly McCoys Enyas although OS old series K&B engines green heads work well Basically engine conversion consists 5 steps 1 Obtain suitable points 2 Modify crankcase accept ignition timer point assembly 3 Fabricate timer body 4 Provide cam operate points 5 Time cam engine basic criteria selection suitable ignition points durability size smaller better expense quality Point assemblies adapted other model airplane engines good bets probability would difficult find next best alternative would adapting points small commercial engines Chainsaw points Homelite Rem ington McCullogh etc excellent some imported motorcycle small automobile points Another option fabricate own using contacts salvaged telephone relays similar electrical equipment Choice also somewhat limited own mechanical abilities probability will have compromise somewhat size bulk suggested points larger old-time engine parts Continued page 122 Three home grown conversions Hans Oclis ner Hand-made timer embodies empty slot clamp regulate ease adjustment Points pivot brass tube pressed timer body Insulated side points isclearly visible Flat spot cam hand-filed polished re duce friction June1979 57 Various timer assemblies illustrate methods mounting fixed contact point well securing insulating movable point Spark adjustment consists tubing machine screw Shape timer body mainly dictated size mounting hole size point assembly EAA members receive SPORT VIA TION magazine ANNUAL DUES $2500 FOR FREE BROCHURE WRITE EXPERIMENTAL AIRCRAFT EA ASSOCIATION INC PO Box 229-A Hales Corners Wisconsin 53130 ial T AIRCRAFT YOU CAN BUILD pp XPERIMENI E AIR CRAFT ASSOCIATION issue Homebuilders Corner ers Editor Hot Line Headquarters Oshkosh Countdown Headquarters Comment fits EAAs Divisions tplane Builder tsmans Corner Building Line Past Members Building 25 Years Ago Out Geometry Differential Belicrank Stroke Engine Today Chapters Action cs Fury N27MS November Two Seven Mike Sally Racer on Accent a-Light Noneybee bergh Commemorative Tour ress Report No 10 Board Directors Meeting Calendar Events ington Report non-subscribers So rules 1 The balsa permitted 3 6 piece ordinary 1/32 sheetno special Indoor stock covering must done 12 X 12 piece ordinary Japanese tissueno superlight pre-war superfine similar stuff 2 Use wire plastic teflon rubber steel aluminum lead dope glue plasticene fiberglass desire 3 You may use styrofoam condenser paper helium hydrogen microfilm ad ditional balsa tissue 4 Model may size configura tion rubber powered hand launched 5 You must give model name supply simple set plans 6 No cheating allowed 7 Models cannot returned Prizes offered best duration unique unusual model best work manship Models must mailed Earl VanGorder 10 Brothers Road Wappin gem Falls NY 12590 before third Thursday January Characteristically models entered take few hours build can build two once have mind little time returning contes tants isnt really worth hassle After contest winners displayed largest local hobby shop others go beginners groups local schools teachers use demonstration students copy learn few tricks What better end Models range ridiculous quite Super-duration models can built within rules cutting wood narrow strips ribs spars tips using wider strips build hollowbox motor stick assembling scaled-down Easy B Pennyplane-type model something other end scale see photo Bill Warners Flying Man inspired 1909 French cartoon titled men become birds birds become men Let imagination wander list entrants winners will sent participants will appear column Bob Meuser 4200 Gregory St Oak land CA 94619 FF Old Timers/Haught continued page 57 Size selected point assembly will also affect mounting engine available space front crank case ahead intake port area will probably need truing up provide smooth round surface timer assembly best accomplished lathe keeping mind minimum machine tool operation other methods available Hans suggests simple tool made bolt half ofa lock washer requires welding brazing service should available local fix shop Try finished diameter close standard drill size simpliI fabrication timer body timer body itself probably appears formidable component make entire conversion project However part can hand produced evening drilling sawing filing tapping threads Aluminum bar stock piece old automotive distributor housing piece old flywheel housing drawings photos give idea drilled hole fit crankcase forms basis work slot clamp screw provide adjustable friction timer body Beyond need spark ad vance lever point pivot spring support stationary point mount point pivot can brass tube pressed hole spark advance lever can long screw spring support stationary point mount can attached screws should integral part timer body cutting filing statio nary point grounded spring mount point will need insulated fiber washers etc required cam can usually made modifying original prop drive washer drawing illustrates several types Basi cally cam consists round surface has lowered portion approxi mately 1/4 90 degrees circumference equal desired point gap 122 Model Aviation about U1U18 low spot con trols duration points closed dwell allowing build up current circuit coil few drive washers simply lend themselves modi fication case suitable drive washercam will have fabricated Prior cutting cam drop install timer assembly engine position timer desired retarded position primar ily determined convenience keeping mind timer will advanced turned against crankshaft rotation engine running approximately 15 40 degrees Rotate crankshaft until piston top dead center Now back off 10 degrees against normal rotation posi tion points should crack open Make suitable marks will guide cutting cam drop will necessary insure cam will reinstalled same position time removed engine has drive washer-cain single flat no problem have double flat splines suitable mark will suffice However engine has tapered drive washer seat will need keyed shaft best accomplished drilling hole parallel shaft half hole crankshaft half cam installing music wire pin point little tinkering engine should ready run con verted glow engines little cantankerous start Hans suggests use electric starter Clarence Haught Route 5 Box 16 Coeur dAlene ID 83814 FF Sport/Scale/Warner continued page 69 FAC Thompson Trophy Races several planes launched time first plane down being eliminated repeated over over until plane winner remains past mid-winter contest has attracted contestants far Connecticut Missouri Philadelphia year no exception hardy group FACers journeying Philadelphia other points out side Washington metropolitan area Some 94 aircraft entered events 29 modelers including seven Juniors Both new events added year Navy Scale Spanish Fly Combat popular Navy Scale interesting because variety aircraft Designs covered spectrum earliest days Naval Aviation history represented Cox Submarine Scout World War II represented Navy Scale winner Les Kings Grumman Bearcat see nine colorful Navy jobs cruising around same time almost too much take P-Nut Scale attracted largest turnout 21 entries Dave Rees picked up well-deserved first place immaculate Corona Cougar Ju nior P-Nut saw seven entries Greg Leffler winning first Luton Major FAC Scale produced 17 aircraft Allan Schanzles pretty Tiger Moth Hi-Flyer kit tops 56 pos sible 62 points FAC bonus point system unusual designs proved Allans undoing since two low-wing ca nard pushers Don Srulls Shinden George Meyers Vari-Viggen received 40 points bonus Since both topped 30 seconds easily cold hangar questions wisdom too bonus points Don Srull won first point Junior FAC Scale produced two-way tie first between Brian Gerstenberg Mike Escalante World War Combat produced 10 en tries ranging Pat Dailys Rumpler C-IV Stew Meyers Fokker Fill final rematch last years final ists Don Srulls DH-6 pitted against George Meyers Siemens Mono plane year Georges turn win No-Cal won Don Srulls super June1979 123 As can see converting engine simple task rewarding challenge purpose discussion certainly take away engine conversion business anything should support fact earn money
Edition: Model Aviation - 1979/06
Page Numbers: 56, 57, 122, 123
56 Model Aviation BE CONVERT few columns back featured some homemade engines John Morrill John able successfully construct engines because skill machinist having access proper machine tools us have necessary skills equipment build own engine would still like try hand engine work Hans Ochsner 4699 Lake George Road Metamora Michigan 48455 has producing successful engine conversions glo ignition using basic tools Before delve details engine conversion let us review essentials wire witn terminal leading spark ignition systems getting bogged plug spark plug itself nothing down heavy theory insulated electrode grounded Coils oonsist iron core wrapped electrode having specific gap conden relatively few turns heavy copper ser essentially two conductive plates wire terminals end Around separated insulation terminals wrapped turns fine oopper plate ignition points nothing mechanically operated switch opera tion power source 3 volts DC connected between ground side coil primary other primary coil terminal connected insulated side points other point grounded points close current flows builds magnetic field coil primary points open field collapses across windings secondary coil inducing high voltage current flows spark plug jumps gap ground firing fuel mixture condenser connected across primary ground condenser acts sort like shock absorber aids instantaneous collapse secondary field over simplification perhaps does convey basic principle considering engine purposes conversion some consideration its intended use timely competition flying ultimate goal selecting displacement near upper limit particular class advisable Keep mind displacement limits conversions lower given class original engines example Class B allows 30 cu original engine against 25 conver sion Also conversions limited con ventional ported loop-scavenged engines means no Schnuerle engines least competition engine selected should have reliable running easy start ing characteristics Hans has used mainly McCoys Enyas although OS old series K&B engines green heads work well Basically engine conversion consists 5 steps 1 Obtain suitable points 2 Modify crankcase accept ignition timer point assembly 3 Fabricate timer body 4 Provide cam operate points 5 Time cam engine basic criteria selection suitable ignition points durability size smaller better expense quality Point assemblies adapted other model airplane engines good bets probability would difficult find next best alternative would adapting points small commercial engines Chainsaw points Homelite Rem ington McCullogh etc excellent some imported motorcycle small automobile points Another option fabricate own using contacts salvaged telephone relays similar electrical equipment Choice also somewhat limited own mechanical abilities probability will have compromise somewhat size bulk suggested points larger old-time engine parts Continued page 122 Three home grown conversions Hans Oclis ner Hand-made timer embodies empty slot clamp regulate ease adjustment Points pivot brass tube pressed timer body Insulated side points isclearly visible Flat spot cam hand-filed polished re duce friction June1979 57 Various timer assemblies illustrate methods mounting fixed contact point well securing insulating movable point Spark adjustment consists tubing machine screw Shape timer body mainly dictated size mounting hole size point assembly EAA members receive SPORT VIA TION magazine ANNUAL DUES $2500 FOR FREE BROCHURE WRITE EXPERIMENTAL AIRCRAFT EA ASSOCIATION INC PO Box 229-A Hales Corners Wisconsin 53130 ial T AIRCRAFT YOU CAN BUILD pp XPERIMENI E AIR CRAFT ASSOCIATION issue Homebuilders Corner ers Editor Hot Line Headquarters Oshkosh Countdown Headquarters Comment fits EAAs Divisions tplane Builder tsmans Corner Building Line Past Members Building 25 Years Ago Out Geometry Differential Belicrank Stroke Engine Today Chapters Action cs Fury N27MS November Two Seven Mike Sally Racer on Accent a-Light Noneybee bergh Commemorative Tour ress Report No 10 Board Directors Meeting Calendar Events ington Report non-subscribers So rules 1 The balsa permitted 3 6 piece ordinary 1/32 sheetno special Indoor stock covering must done 12 X 12 piece ordinary Japanese tissueno superlight pre-war superfine similar stuff 2 Use wire plastic teflon rubber steel aluminum lead dope glue plasticene fiberglass desire 3 You may use styrofoam condenser paper helium hydrogen microfilm ad ditional balsa tissue 4 Model may size configura tion rubber powered hand launched 5 You must give model name supply simple set plans 6 No cheating allowed 7 Models cannot returned Prizes offered best duration unique unusual model best work manship Models must mailed Earl VanGorder 10 Brothers Road Wappin gem Falls NY 12590 before third Thursday January Characteristically models entered take few hours build can build two once have mind little time returning contes tants isnt really worth hassle After contest winners displayed largest local hobby shop others go beginners groups local schools teachers use demonstration students copy learn few tricks What better end Models range ridiculous quite Super-duration models can built within rules cutting wood narrow strips ribs spars tips using wider strips build hollowbox motor stick assembling scaled-down Easy B Pennyplane-type model something other end scale see photo Bill Warners Flying Man inspired 1909 French cartoon titled men become birds birds become men Let imagination wander list entrants winners will sent participants will appear column Bob Meuser 4200 Gregory St Oak land CA 94619 FF Old Timers/Haught continued page 57 Size selected point assembly will also affect mounting engine available space front crank case ahead intake port area will probably need truing up provide smooth round surface timer assembly best accomplished lathe keeping mind minimum machine tool operation other methods available Hans suggests simple tool made bolt half ofa lock washer requires welding brazing service should available local fix shop Try finished diameter close standard drill size simpliI fabrication timer body timer body itself probably appears formidable component make entire conversion project However part can hand produced evening drilling sawing filing tapping threads Aluminum bar stock piece old automotive distributor housing piece old flywheel housing drawings photos give idea drilled hole fit crankcase forms basis work slot clamp screw provide adjustable friction timer body Beyond need spark ad vance lever point pivot spring support stationary point mount point pivot can brass tube pressed hole spark advance lever can long screw spring support stationary point mount can attached screws should integral part timer body cutting filing statio nary point grounded spring mount point will need insulated fiber washers etc required cam can usually made modifying original prop drive washer drawing illustrates several types Basi cally cam consists round surface has lowered portion approxi mately 1/4 90 degrees circumference equal desired point gap 122 Model Aviation about U1U18 low spot con trols duration points closed dwell allowing build up current circuit coil few drive washers simply lend themselves modi fication case suitable drive washercam will have fabricated Prior cutting cam drop install timer assembly engine position timer desired retarded position primar ily determined convenience keeping mind timer will advanced turned against crankshaft rotation engine running approximately 15 40 degrees Rotate crankshaft until piston top dead center Now back off 10 degrees against normal rotation posi tion points should crack open Make suitable marks will guide cutting cam drop will necessary insure cam will reinstalled same position time removed engine has drive washer-cain single flat no problem have double flat splines suitable mark will suffice However engine has tapered drive washer seat will need keyed shaft best accomplished drilling hole parallel shaft half hole crankshaft half cam installing music wire pin point little tinkering engine should ready run con verted glow engines little cantankerous start Hans suggests use electric starter Clarence Haught Route 5 Box 16 Coeur dAlene ID 83814 FF Sport/Scale/Warner continued page 69 FAC Thompson Trophy Races several planes launched time first plane down being eliminated repeated over over until plane winner remains past mid-winter contest has attracted contestants far Connecticut Missouri Philadelphia year no exception hardy group FACers journeying Philadelphia other points out side Washington metropolitan area Some 94 aircraft entered events 29 modelers including seven Juniors Both new events added year Navy Scale Spanish Fly Combat popular Navy Scale interesting because variety aircraft Designs covered spectrum earliest days Naval Aviation history represented Cox Submarine Scout World War II represented Navy Scale winner Les Kings Grumman Bearcat see nine colorful Navy jobs cruising around same time almost too much take P-Nut Scale attracted largest turnout 21 entries Dave Rees picked up well-deserved first place immaculate Corona Cougar Ju nior P-Nut saw seven entries Greg Leffler winning first Luton Major FAC Scale produced 17 aircraft Allan Schanzles pretty Tiger Moth Hi-Flyer kit tops 56 pos sible 62 points FAC bonus point system unusual designs proved Allans undoing since two low-wing ca nard pushers Don Srulls Shinden George Meyers Vari-Viggen received 40 points bonus Since both topped 30 seconds easily cold hangar questions wisdom too bonus points Don Srull won first point Junior FAC Scale produced two-way tie first between Brian Gerstenberg Mike Escalante World War Combat produced 10 en tries ranging Pat Dailys Rumpler C-IV Stew Meyers Fokker Fill final rematch last years final ists Don Srulls DH-6 pitted against George Meyers Siemens Mono plane year Georges turn win No-Cal won Don Srulls super June1979 123 As can see converting engine simple task rewarding challenge purpose discussion certainly take away engine conversion business anything should support fact earn money