BEFORE starting mnig mis monmn- column iem mention delighted hear some Inquisitive readers beginning wonder anyone ever read column difficult write about something have no feedback readers appeal keep cards letters comingeven its just say hi something wouid ilke share send especiaiiy pertains engine work may seem unimpor tant modeiers just starting interested ail sorts good poop boaters read column engine information Hope boaters write about engine problems solutions finally blackmailed Nick Sher writing article 1/2 speed Nick has done outstanding job making COX TD 04 perform extremely well has agreed share secrets months coiumn copy follows GENE HEMPEL has requested write article about 1/2 speed specif ically engine modifications information supplied accumulation knowledge experience such engine experts Remember 100 mph 1 12A wss sensational Using Schnuerie piped Cox engine single-blade propeller two-blades plc Nick Sher turned 12743 mph tells did Fuselage inverted showing power pod pipe pictures tell clear story installation details considerable rework done internally engineas text relates 36 Model Aviation Hot pan After break-lnsee text wilitach 20 22000 breakin fueiK&B 100 case pipe adapter 70% nitro fuel 25 27000 rpm indicative good performance pipe adapter usually add 2 3000 rpm ground Frank Garzon Dub Jett John Shannon Mike Langlois like has fun implement ideas plus few own last speed meet season Flushing New York using Schnuerle piped Cox single-bladed prop first Frank Garzon needle turned slightly lean 706 sec 12743 mph top shell ship rubbing against prop driver did fly again some techniques used achieve speed numbers article measured directly engine used Flushing meet have gone great lengths make measurements accu rately have too much respect hobby people may read otherwise TIpSOAV2A Speed 1 Crankcase Selection Place case Cox speed pan check flatness mounting lugs pan versus centerline shaft bearing centerline pan inspection tools available check shaft cylin der centerline alignments mounting lug flatness parallelism shaft bearing centerline 2 Shaft Selectioiu Locate obtain several shafts have thick counterweight web latest series Using depth microm eter select shaft has longest stroke ie measure stroke piston partially assembled engine changing shaft Remember 1/2 displacement can go 00504 cu according AMA rule book After measuring stroke check sure crank rod journal center looking down cylinder barrel top very important Before removing shaft case check front rear alignment shaft intake port relation case intake opening may have remove some metal either case shaft proper alignment 3 TDC Alignment Temporarily assem ble shaft case piston blank cylin der Tighten cylinder measure piston depth versus plug step depth cylinder piston top dead center using depth mike piston generally 005 007 above step Select metal gasket washer use stainless steel thick ness will cause alignment piston top glow plug step TDC washer placed under cylinder base mounting surface Make certain washer place during cylinder timing measurements 4 Engine Timing ShaftGrind open transfer hole shaft 0200 dia time port open 35 degrees ABDC close 65 degrees ATDC have shaft flash chromed polished fitted case honing case bearing hole timing modification crankshaft 550F11177FKTFT 050014II 0 RING HI TEMP PIPE ADAPTER accomplished following method 1 Paint some lay-out blue around port opening shaft 2 Insert shaft case mount degree wheel shaft assembled engine 3 Scribe opening closure lines shaft using sharp needle 4 After removing shaft case ready remove material shaft Dremel type tool carbide cutters b Blank CylinderScrew cylinder case sure forget metal washer GRIND DOWN KIRN RESET TOOL / FLAT EDGE 32 under cylinder base until tight Place mark exhaust port outlet should Now comes hard part Start cutting exhaust port opening first proceed port cylinder following dimensions Exhaust Port0355 width 0140 height radiused oomers Timing 172 degrees open ATDC Boost Port0200 width timing 126 degrees open ATDC Main Ports0300 base 0230 width port opening ports raked forward Timing 128 degrees open ATDC Locate piston slightly larger cylin der such will just start bottom cylinder Now ready start honing lapping cylinder match piston piston cylinder fit such piston falls through cylinder its own weight Top Dead Center both clean dry fitting piston cylinder wise check fit frequently make sure have gone too far 375 OD 300 D T U- 4 BRAZE 2-56 SCREW 5 Back Plate Machine crankcase lip such backplate cover tightened comes within 0015 shaft rod journal File slight flat top back plate cover prevent piston skirt interference Check seated cover does leak 6 Remaining Parts exception prop nut remaining parts stock including venturi using suction tank venturi larger stock approximately 0116 dia will 407 DIA j~265 LOj330 I- IAO5K 250 DIA LiALU ANVIL jqIDIA1PLUG ALU ANVIL RESET FIXTURES cause erratic running loss rpm needle valve assembly standard Kim variety prop nut machined aluminum stock drilled tapped aS 40 stud arrangement necessary properly retain single bladed prop 7 Pipe Adapter part key proper 2 015 BRASSSTA 2 WRAP AROUND I,- EPOXY SOLDER PROP pipe performance must made cor rectly no leaks material should ledloy steel closely matches cyl inder material thermally thus preventing Continued page 108 610 aD MATL OIOALU.2500D 200 ID -a 82I D PIPE May1979 37 1L1 9 SHIRT AMA WINGS AMA Wings 4 COLOR$650 PERMISSION FROM AMA Size S M L XL ostage custom work Clubs special events businesses Information sent request FLI * HIRT 5132 DEL REV VEGAS NEVADA 702 878-162489102 PLANS7 MAP range plans England largest compre hensive world Buya plans handbook find out yourself handbook contains full details of thousands plans prices plans available US agents listed handbooks Aeromodeiling Model Boats Cars Modei Engineering Radio ControlAircraft model Allied MAP PUbli wtiom Ltd runners sanitary engineers clean up end day Half-A judges test pilots judging practice Monday July 30 Contact Lanny 661 Louie Avenue Lodi CA 95240 tel 209 3689492 request has made infor mation Cobra originally designed Steve Wooley 35-size ship classic style turtle deck long slim fuselage similar Ares Steve built Cobra sometime 1969 70 magazine article did appear now defunct American Aircraft Modeler until February 1971 Steve built few air planes preferring race sports cars unfortunately cause death racing accident 1970 talented flier professed dislike practicing however managed finish fourth World Championships 1960 66 68 third place 1962 Nats open second 58 Nats senior division Cobra modernization Wooleys Argus used 1960 World Champs Cobra approxi mately 580 sq wing 10375 root chord front moment arm 935 m rear moment arm 1375 stab approximately 25 in span Steve stated Cobra article plane slightly larger wing area flap area earlier Argus stab also larger Argus built late SOs very similar Bill Werwages Ares surprising since Bill Steve close friends Argus Cobra built Steve I-beam wings large wheel pants slim fuselages charac teristic Detroiter style stunt ships SOs early 60s Plans Cobra probably non existant since AAM went out business could obtain old copy maga zine article plans appeared article same applies Argus appeared American Modeler August 1961 Plans Ares Bill Werwage still available through Hobby Helpers 1543 StilIwell Avenue Bronx NY 10461 plan Group 560 Mike Ditrich 2402 Penna Avenue Erie PA 16503 has built succession of46 size Cobras I-beam wings very good airplanes will fly anything turn very well improvement over original Cobra might contact Mike some basic dimensions Unfor tunately could find picture Mikes airplanes time writing information stunt PAMPA write Wynn PauL 1640 Maywick Dr Lexington KY 40504 CL Speed/Hempel continued page 37 leakage due loosening part becomes extremely hot during pipe runs Dimensions shown Pipe Adapter drawing important clamp ID cylinder OD exactly same dimen sion prevent distortion tightening Further contour exhaust opening clamp good match cylinder exhaust added rpm 8 Pipe pipe purchased Dub Jett Dimensions shown drawing Tuned Pipe pipe made aluminum has aluminum soldered Make sure no leaks check after flight use Epoxy-Patch 1 iC black made Hysol Div Dexter Corp seal small leaks pipe adapter mounted engine pipe place distance plug center end pipe 10 Plug center pipe maximum diameter 7 7/16 9 Plug Although Gb-Bee plug yields higher non-piped rpm ground air performance pipe has disap pointing best performance use stock Cox plug machine OD Gb-Bee button configuration hold down Glow-Bee clamp generally use gasket plug blows on pipe flight Russian Roulette chance taking plug element ports damaging cylinder piston nature speed score marks too deep cylinder can lightly polished using following technique Make small aluminum expandable man drel fits cylinder Mount mandrel drill press lathe Place cylinder onto mandrel plenty Marvel Mystery Oil expand mandrel until just starts make contact cylinder walls Hold cylinder mandrel rotates stroking cylinder gently observe can get rid score marks method will usually need replace piston replace piston need start over honing lapping new piston fit plug must extremely tight before run prevent loosening flight loose plug will ininiediately cause engine go overlean Use two wrenches cylinder plug tighten plug properly 10 Prop have tried props have learned singie blade prop far fastest 1/2 speed single blade used date dimensioned Prop drawing Rev-Up 55 cut shown station 3 4 Prather Pitch Gauge reads S pitch 4 h tip Its balanced similarly standard prop have experimenting props 11 Ball Socket high rpm sooner later rod piston ball socket will loosen try judge tighten amount sound play using normal Kirn reset tool flat aluminum plate losing 50% pistons due distortion OD 108 Model Aviation ME AND MY RC 4 COLOR EXCLUSIVE RIGHTS FROM ROYAL CROWN COLA choice PLANE S BOAT CAR Ofl poly FLI CAP ester/ Cotton T-shirt Handbook Handbook 2 Handbook 3 Handbook 4 Available USA Price $150 including postage Sales Office PO Box 35 BrIdge Street Hemel Hempeteed Hens HP1 lEE England C/L Flyer SAFELOK LAUNCHER FEATURES plated 1/8 steel support member plated 3/32 manganese bronze moving parts 050 X aluminum anchor strap simple anchoring stake turf spike asphalt screw eye-bolt 6-32 T nut furnished board mounting 25 lb capacity will pull apart 125 Ibs spring biased restraint arm thrown open position release $495 pp USA WRITE ST CLAIR MODEL COMPONENTS P0 Box 5626 Eugene OR 97405 WHY PAY MORE big buy high performance *FIREBALL #H30 HOT 3 volts faster starts #S20 STANDARD 24 volts general use #C15 COOL 15 volts cures pre-ignifion ust fun stick FIRE BALL great engine runs * advanced98 FLASH STARTING0 UNEXCELLED POWEP LONGER LIFE0 LOWEST DRAIN GLOW PLUGS SWANSON ASSOCIATES P0 BOX 161WAYNE NEW JEMEY 07470 However use fixtures shown Reset Fixtures drawing designed Frank Garzon seldom lose piston Place aluminum anvil plug 1 X 1 anvil step facing upward assembly placed rigid flat surface insert piston face down against plug Place modified Kim tool against ball socket maintaining pressure As start hammer rotate tool frequently checking often bind rod piston socket Burrs will raised socket Kim tool Use Dremel tool deburring clean piston thoroughly soap water have lost cylinder hard burrs broke free 12 Running youre still reading exhausted Tam well conclude paragraph High-nitro fuels should used new Cox engine use K&B 100 Cox Gray 6/3 prop cut flat across tips aS dia break-in good engine after 1/2 hour running should tech 20 22000 rpm prop fuel open face pipe adapter Some fuel should evidence around first end during running signifying good shaft case fit adequate lubrication pipe speeds lubrication critical 70% nitro fuels 25 27000rpm prop indicative good performance pipe adapter usually add 2 3000 rpm ground rush break-in stage have seen tach changes 1 2000 rpm time accumulated engine Try different pistons particularly worn ones against tach improved results aforementioned rpm have initially attained SERVICES/MATERIALS 1 Cox Blank Cylinder Barrels Jack Fraher 3900 Greystone Ave Riverdale NY 10463 Tel 2125491743 2 Schnuerle Porting Service Pipe Adapter Mike Langlois 2408 west Cornwallis Dr Greensboro NC 27408 Tel 919288 5900 3 Pipe Adapters Dub Jett 4720 Aslibrook Dallas TX 75227 4 Shaft Chrome Cylinder/Case Hoain Machine work Gene Hempel 302 North Yale Dr Garland TX 75042 Tel 2142725210 5 For Information Nick Sher 815 Beech Rd Lassghorne PA 19047 Tel 2157575373 61/2 Parts Kaxtom Kraftsmassship PO Box 2699 Laguna Hills CA 92653 Gene Hempel 302 North Yale Dr Gar land TX 75042 CL Scale/Gretz continued page 38 dirty proffle model pushrods engine tank etc hanging out over place would have much drag scale model Just remember increased scale cross-section frontal area wont afitect models performance great extent unless accompanied increase weight Look fullscale Gee Bee racers relied smooth contours overcome huge frontal area Wing Loading meaning weight wing area ratio Power Loading weight thrust ratio keys good flight performance Wing Loading par ticular real difference between CL stunt CL scale model much drag frontal area Al Rabes well known stunt models good recent example So keep Focke-Wulf light aero-dynamically clean pos sible sure use braided steel control lines opposed dacron lines minimum drag Back Chris Would desirable stunting point view eliminate some three inches dihedral plans call know would remove lot scale appearance might flatter wing improve control line flying begier. Could should RC aile rons completed CL flaps Reply would check some photos three-view drawing use scale amount dihedral House Balsa may have increased dihedral RC flight Again can look some Al Rabes stunt models recent proof dihedral itself doesnt hinder stunting ability wing removable model Chris wouldnt make way Building wing model could save little weight access inside fuse isnt important RC version Likewise removable hatches other engine cowl would build too Remember light weight important hope stunt scale model problem using RC ailerons CL stunt type flaps fact area near wing tips could cause rocking motion range movement too extreme Never theless would definitely try using ailerons stunt flaps model type purpose would limit travel about vator travel starters other words maximum elevator 450 have about 15 flaps slight flap movement shouldnt cause trouble may extra edge need enable model some basic aerobatics Chris question about dihedral brings up something didnt have room talk about January column Most can grasp aircraft has fore aft balance point often mis takenly referred Center Gravity CG Actually Center Gravity refers See Drawing No 1 point airplane regardless airplanes attitude about can perfectly balanced point center aircrafts total weight Center Gravity includes fore aft balance point well balance points along aircrafts other axes 110 Model Aviation
Edition: Model Aviation - 1979/05
Page Numbers: 36, 37, 108, 110
BEFORE starting mnig mis monmn- column iem mention delighted hear some Inquisitive readers beginning wonder anyone ever read column difficult write about something have no feedback readers appeal keep cards letters comingeven its just say hi something wouid ilke share send especiaiiy pertains engine work may seem unimpor tant modeiers just starting interested ail sorts good poop boaters read column engine information Hope boaters write about engine problems solutions finally blackmailed Nick Sher writing article 1/2 speed Nick has done outstanding job making COX TD 04 perform extremely well has agreed share secrets months coiumn copy follows GENE HEMPEL has requested write article about 1/2 speed specif ically engine modifications information supplied accumulation knowledge experience such engine experts Remember 100 mph 1 12A wss sensational Using Schnuerie piped Cox engine single-blade propeller two-blades plc Nick Sher turned 12743 mph tells did Fuselage inverted showing power pod pipe pictures tell clear story installation details considerable rework done internally engineas text relates 36 Model Aviation Hot pan After break-lnsee text wilitach 20 22000 breakin fueiK&B 100 case pipe adapter 70% nitro fuel 25 27000 rpm indicative good performance pipe adapter usually add 2 3000 rpm ground Frank Garzon Dub Jett John Shannon Mike Langlois like has fun implement ideas plus few own last speed meet season Flushing New York using Schnuerle piped Cox single-bladed prop first Frank Garzon needle turned slightly lean 706 sec 12743 mph top shell ship rubbing against prop driver did fly again some techniques used achieve speed numbers article measured directly engine used Flushing meet have gone great lengths make measurements accu rately have too much respect hobby people may read otherwise TIpSOAV2A Speed 1 Crankcase Selection Place case Cox speed pan check flatness mounting lugs pan versus centerline shaft bearing centerline pan inspection tools available check shaft cylin der centerline alignments mounting lug flatness parallelism shaft bearing centerline 2 Shaft Selectioiu Locate obtain several shafts have thick counterweight web latest series Using depth microm eter select shaft has longest stroke ie measure stroke piston partially assembled engine changing shaft Remember 1/2 displacement can go 00504 cu according AMA rule book After measuring stroke check sure crank rod journal center looking down cylinder barrel top very important Before removing shaft case check front rear alignment shaft intake port relation case intake opening may have remove some metal either case shaft proper alignment 3 TDC Alignment Temporarily assem ble shaft case piston blank cylin der Tighten cylinder measure piston depth versus plug step depth cylinder piston top dead center using depth mike piston generally 005 007 above step Select metal gasket washer use stainless steel thick ness will cause alignment piston top glow plug step TDC washer placed under cylinder base mounting surface Make certain washer place during cylinder timing measurements 4 Engine Timing ShaftGrind open transfer hole shaft 0200 dia time port open 35 degrees ABDC close 65 degrees ATDC have shaft flash chromed polished fitted case honing case bearing hole timing modification crankshaft 550F11177FKTFT 050014II 0 RING HI TEMP PIPE ADAPTER accomplished following method 1 Paint some lay-out blue around port opening shaft 2 Insert shaft case mount degree wheel shaft assembled engine 3 Scribe opening closure lines shaft using sharp needle 4 After removing shaft case ready remove material shaft Dremel type tool carbide cutters b Blank CylinderScrew cylinder case sure forget metal washer GRIND DOWN KIRN RESET TOOL / FLAT EDGE 32 under cylinder base until tight Place mark exhaust port outlet should Now comes hard part Start cutting exhaust port opening first proceed port cylinder following dimensions Exhaust Port0355 width 0140 height radiused oomers Timing 172 degrees open ATDC Boost Port0200 width timing 126 degrees open ATDC Main Ports0300 base 0230 width port opening ports raked forward Timing 128 degrees open ATDC Locate piston slightly larger cylin der such will just start bottom cylinder Now ready start honing lapping cylinder match piston piston cylinder fit such piston falls through cylinder its own weight Top Dead Center both clean dry fitting piston cylinder wise check fit frequently make sure have gone too far 375 OD 300 D T U- 4 BRAZE 2-56 SCREW 5 Back Plate Machine crankcase lip such backplate cover tightened comes within 0015 shaft rod journal File slight flat top back plate cover prevent piston skirt interference Check seated cover does leak 6 Remaining Parts exception prop nut remaining parts stock including venturi using suction tank venturi larger stock approximately 0116 dia will 407 DIA j~265 LOj330 I- IAO5K 250 DIA LiALU ANVIL jqIDIA1PLUG ALU ANVIL RESET FIXTURES cause erratic running loss rpm needle valve assembly standard Kim variety prop nut machined aluminum stock drilled tapped aS 40 stud arrangement necessary properly retain single bladed prop 7 Pipe Adapter part key proper 2 015 BRASSSTA 2 WRAP AROUND I,- EPOXY SOLDER PROP pipe performance must made cor rectly no leaks material should ledloy steel closely matches cyl inder material thermally thus preventing Continued page 108 610 aD MATL OIOALU.2500D 200 ID -a 82I D PIPE May1979 37 1L1 9 SHIRT AMA WINGS AMA Wings 4 COLOR$650 PERMISSION FROM AMA Size S M L XL ostage custom work Clubs special events businesses Information sent request FLI * HIRT 5132 DEL REV VEGAS NEVADA 702 878-162489102 PLANS7 MAP range plans England largest compre hensive world Buya plans handbook find out yourself handbook contains full details of thousands plans prices plans available US agents listed handbooks Aeromodeiling Model Boats Cars Modei Engineering Radio ControlAircraft model Allied MAP PUbli wtiom Ltd runners sanitary engineers clean up end day Half-A judges test pilots judging practice Monday July 30 Contact Lanny 661 Louie Avenue Lodi CA 95240 tel 209 3689492 request has made infor mation Cobra originally designed Steve Wooley 35-size ship classic style turtle deck long slim fuselage similar Ares Steve built Cobra sometime 1969 70 magazine article did appear now defunct American Aircraft Modeler until February 1971 Steve built few air planes preferring race sports cars unfortunately cause death racing accident 1970 talented flier professed dislike practicing however managed finish fourth World Championships 1960 66 68 third place 1962 Nats open second 58 Nats senior division Cobra modernization Wooleys Argus used 1960 World Champs Cobra approxi mately 580 sq wing 10375 root chord front moment arm 935 m rear moment arm 1375 stab approximately 25 in span Steve stated Cobra article plane slightly larger wing area flap area earlier Argus stab also larger Argus built late SOs very similar Bill Werwages Ares surprising since Bill Steve close friends Argus Cobra built Steve I-beam wings large wheel pants slim fuselages charac teristic Detroiter style stunt ships SOs early 60s Plans Cobra probably non existant since AAM went out business could obtain old copy maga zine article plans appeared article same applies Argus appeared American Modeler August 1961 Plans Ares Bill Werwage still available through Hobby Helpers 1543 StilIwell Avenue Bronx NY 10461 plan Group 560 Mike Ditrich 2402 Penna Avenue Erie PA 16503 has built succession of46 size Cobras I-beam wings very good airplanes will fly anything turn very well improvement over original Cobra might contact Mike some basic dimensions Unfor tunately could find picture Mikes airplanes time writing information stunt PAMPA write Wynn PauL 1640 Maywick Dr Lexington KY 40504 CL Speed/Hempel continued page 37 leakage due loosening part becomes extremely hot during pipe runs Dimensions shown Pipe Adapter drawing important clamp ID cylinder OD exactly same dimen sion prevent distortion tightening Further contour exhaust opening clamp good match cylinder exhaust added rpm 8 Pipe pipe purchased Dub Jett Dimensions shown drawing Tuned Pipe pipe made aluminum has aluminum soldered Make sure no leaks check after flight use Epoxy-Patch 1 iC black made Hysol Div Dexter Corp seal small leaks pipe adapter mounted engine pipe place distance plug center end pipe 10 Plug center pipe maximum diameter 7 7/16 9 Plug Although Gb-Bee plug yields higher non-piped rpm ground air performance pipe has disap pointing best performance use stock Cox plug machine OD Gb-Bee button configuration hold down Glow-Bee clamp generally use gasket plug blows on pipe flight Russian Roulette chance taking plug element ports damaging cylinder piston nature speed score marks too deep cylinder can lightly polished using following technique Make small aluminum expandable man drel fits cylinder Mount mandrel drill press lathe Place cylinder onto mandrel plenty Marvel Mystery Oil expand mandrel until just starts make contact cylinder walls Hold cylinder mandrel rotates stroking cylinder gently observe can get rid score marks method will usually need replace piston replace piston need start over honing lapping new piston fit plug must extremely tight before run prevent loosening flight loose plug will ininiediately cause engine go overlean Use two wrenches cylinder plug tighten plug properly 10 Prop have tried props have learned singie blade prop far fastest 1/2 speed single blade used date dimensioned Prop drawing Rev-Up 55 cut shown station 3 4 Prather Pitch Gauge reads S pitch 4 h tip Its balanced similarly standard prop have experimenting props 11 Ball Socket high rpm sooner later rod piston ball socket will loosen try judge tighten amount sound play using normal Kirn reset tool flat aluminum plate losing 50% pistons due distortion OD 108 Model Aviation ME AND MY RC 4 COLOR EXCLUSIVE RIGHTS FROM ROYAL CROWN COLA choice PLANE S BOAT CAR Ofl poly FLI CAP ester/ Cotton T-shirt Handbook Handbook 2 Handbook 3 Handbook 4 Available USA Price $150 including postage Sales Office PO Box 35 BrIdge Street Hemel Hempeteed Hens HP1 lEE England C/L Flyer SAFELOK LAUNCHER FEATURES plated 1/8 steel support member plated 3/32 manganese bronze moving parts 050 X aluminum anchor strap simple anchoring stake turf spike asphalt screw eye-bolt 6-32 T nut furnished board mounting 25 lb capacity will pull apart 125 Ibs spring biased restraint arm thrown open position release $495 pp USA WRITE ST CLAIR MODEL COMPONENTS P0 Box 5626 Eugene OR 97405 WHY PAY MORE big buy high performance *FIREBALL #H30 HOT 3 volts faster starts #S20 STANDARD 24 volts general use #C15 COOL 15 volts cures pre-ignifion ust fun stick FIRE BALL great engine runs * advanced98 FLASH STARTING0 UNEXCELLED POWEP LONGER LIFE0 LOWEST DRAIN GLOW PLUGS SWANSON ASSOCIATES P0 BOX 161WAYNE NEW JEMEY 07470 However use fixtures shown Reset Fixtures drawing designed Frank Garzon seldom lose piston Place aluminum anvil plug 1 X 1 anvil step facing upward assembly placed rigid flat surface insert piston face down against plug Place modified Kim tool against ball socket maintaining pressure As start hammer rotate tool frequently checking often bind rod piston socket Burrs will raised socket Kim tool Use Dremel tool deburring clean piston thoroughly soap water have lost cylinder hard burrs broke free 12 Running youre still reading exhausted Tam well conclude paragraph High-nitro fuels should used new Cox engine use K&B 100 Cox Gray 6/3 prop cut flat across tips aS dia break-in good engine after 1/2 hour running should tech 20 22000 rpm prop fuel open face pipe adapter Some fuel should evidence around first end during running signifying good shaft case fit adequate lubrication pipe speeds lubrication critical 70% nitro fuels 25 27000rpm prop indicative good performance pipe adapter usually add 2 3000 rpm ground rush break-in stage have seen tach changes 1 2000 rpm time accumulated engine Try different pistons particularly worn ones against tach improved results aforementioned rpm have initially attained SERVICES/MATERIALS 1 Cox Blank Cylinder Barrels Jack Fraher 3900 Greystone Ave Riverdale NY 10463 Tel 2125491743 2 Schnuerle Porting Service Pipe Adapter Mike Langlois 2408 west Cornwallis Dr Greensboro NC 27408 Tel 919288 5900 3 Pipe Adapters Dub Jett 4720 Aslibrook Dallas TX 75227 4 Shaft Chrome Cylinder/Case Hoain Machine work Gene Hempel 302 North Yale Dr Garland TX 75042 Tel 2142725210 5 For Information Nick Sher 815 Beech Rd Lassghorne PA 19047 Tel 2157575373 61/2 Parts Kaxtom Kraftsmassship PO Box 2699 Laguna Hills CA 92653 Gene Hempel 302 North Yale Dr Gar land TX 75042 CL Scale/Gretz continued page 38 dirty proffle model pushrods engine tank etc hanging out over place would have much drag scale model Just remember increased scale cross-section frontal area wont afitect models performance great extent unless accompanied increase weight Look fullscale Gee Bee racers relied smooth contours overcome huge frontal area Wing Loading meaning weight wing area ratio Power Loading weight thrust ratio keys good flight performance Wing Loading par ticular real difference between CL stunt CL scale model much drag frontal area Al Rabes well known stunt models good recent example So keep Focke-Wulf light aero-dynamically clean pos sible sure use braided steel control lines opposed dacron lines minimum drag Back Chris Would desirable stunting point view eliminate some three inches dihedral plans call know would remove lot scale appearance might flatter wing improve control line flying begier. Could should RC aile rons completed CL flaps Reply would check some photos three-view drawing use scale amount dihedral House Balsa may have increased dihedral RC flight Again can look some Al Rabes stunt models recent proof dihedral itself doesnt hinder stunting ability wing removable model Chris wouldnt make way Building wing model could save little weight access inside fuse isnt important RC version Likewise removable hatches other engine cowl would build too Remember light weight important hope stunt scale model problem using RC ailerons CL stunt type flaps fact area near wing tips could cause rocking motion range movement too extreme Never theless would definitely try using ailerons stunt flaps model type purpose would limit travel about vator travel starters other words maximum elevator 450 have about 15 flaps slight flap movement shouldnt cause trouble may extra edge need enable model some basic aerobatics Chris question about dihedral brings up something didnt have room talk about January column Most can grasp aircraft has fore aft balance point often mis takenly referred Center Gravity CG Actually Center Gravity refers See Drawing No 1 point airplane regardless airplanes attitude about can perfectly balanced point center aircrafts total weight Center Gravity includes fore aft balance point well balance points along aircrafts other axes 110 Model Aviation
Edition: Model Aviation - 1979/05
Page Numbers: 36, 37, 108, 110
BEFORE starting mnig mis monmn- column iem mention delighted hear some Inquisitive readers beginning wonder anyone ever read column difficult write about something have no feedback readers appeal keep cards letters comingeven its just say hi something wouid ilke share send especiaiiy pertains engine work may seem unimpor tant modeiers just starting interested ail sorts good poop boaters read column engine information Hope boaters write about engine problems solutions finally blackmailed Nick Sher writing article 1/2 speed Nick has done outstanding job making COX TD 04 perform extremely well has agreed share secrets months coiumn copy follows GENE HEMPEL has requested write article about 1/2 speed specif ically engine modifications information supplied accumulation knowledge experience such engine experts Remember 100 mph 1 12A wss sensational Using Schnuerie piped Cox engine single-blade propeller two-blades plc Nick Sher turned 12743 mph tells did Fuselage inverted showing power pod pipe pictures tell clear story installation details considerable rework done internally engineas text relates 36 Model Aviation Hot pan After break-lnsee text wilitach 20 22000 breakin fueiK&B 100 case pipe adapter 70% nitro fuel 25 27000 rpm indicative good performance pipe adapter usually add 2 3000 rpm ground Frank Garzon Dub Jett John Shannon Mike Langlois like has fun implement ideas plus few own last speed meet season Flushing New York using Schnuerle piped Cox single-bladed prop first Frank Garzon needle turned slightly lean 706 sec 12743 mph top shell ship rubbing against prop driver did fly again some techniques used achieve speed numbers article measured directly engine used Flushing meet have gone great lengths make measurements accu rately have too much respect hobby people may read otherwise TIpSOAV2A Speed 1 Crankcase Selection Place case Cox speed pan check flatness mounting lugs pan versus centerline shaft bearing centerline pan inspection tools available check shaft cylin der centerline alignments mounting lug flatness parallelism shaft bearing centerline 2 Shaft Selectioiu Locate obtain several shafts have thick counterweight web latest series Using depth microm eter select shaft has longest stroke ie measure stroke piston partially assembled engine changing shaft Remember 1/2 displacement can go 00504 cu according AMA rule book After measuring stroke check sure crank rod journal center looking down cylinder barrel top very important Before removing shaft case check front rear alignment shaft intake port relation case intake opening may have remove some metal either case shaft proper alignment 3 TDC Alignment Temporarily assem ble shaft case piston blank cylin der Tighten cylinder measure piston depth versus plug step depth cylinder piston top dead center using depth mike piston generally 005 007 above step Select metal gasket washer use stainless steel thick ness will cause alignment piston top glow plug step TDC washer placed under cylinder base mounting surface Make certain washer place during cylinder timing measurements 4 Engine Timing ShaftGrind open transfer hole shaft 0200 dia time port open 35 degrees ABDC close 65 degrees ATDC have shaft flash chromed polished fitted case honing case bearing hole timing modification crankshaft 550F11177FKTFT 050014II 0 RING HI TEMP PIPE ADAPTER accomplished following method 1 Paint some lay-out blue around port opening shaft 2 Insert shaft case mount degree wheel shaft assembled engine 3 Scribe opening closure lines shaft using sharp needle 4 After removing shaft case ready remove material shaft Dremel type tool carbide cutters b Blank CylinderScrew cylinder case sure forget metal washer GRIND DOWN KIRN RESET TOOL / FLAT EDGE 32 under cylinder base until tight Place mark exhaust port outlet should Now comes hard part Start cutting exhaust port opening first proceed port cylinder following dimensions Exhaust Port0355 width 0140 height radiused oomers Timing 172 degrees open ATDC Boost Port0200 width timing 126 degrees open ATDC Main Ports0300 base 0230 width port opening ports raked forward Timing 128 degrees open ATDC Locate piston slightly larger cylin der such will just start bottom cylinder Now ready start honing lapping cylinder match piston piston cylinder fit such piston falls through cylinder its own weight Top Dead Center both clean dry fitting piston cylinder wise check fit frequently make sure have gone too far 375 OD 300 D T U- 4 BRAZE 2-56 SCREW 5 Back Plate Machine crankcase lip such backplate cover tightened comes within 0015 shaft rod journal File slight flat top back plate cover prevent piston skirt interference Check seated cover does leak 6 Remaining Parts exception prop nut remaining parts stock including venturi using suction tank venturi larger stock approximately 0116 dia will 407 DIA j~265 LOj330 I- IAO5K 250 DIA LiALU ANVIL jqIDIA1PLUG ALU ANVIL RESET FIXTURES cause erratic running loss rpm needle valve assembly standard Kim variety prop nut machined aluminum stock drilled tapped aS 40 stud arrangement necessary properly retain single bladed prop 7 Pipe Adapter part key proper 2 015 BRASSSTA 2 WRAP AROUND I,- EPOXY SOLDER PROP pipe performance must made cor rectly no leaks material should ledloy steel closely matches cyl inder material thermally thus preventing Continued page 108 610 aD MATL OIOALU.2500D 200 ID -a 82I D PIPE May1979 37 1L1 9 SHIRT AMA WINGS AMA Wings 4 COLOR$650 PERMISSION FROM AMA Size S M L XL ostage custom work Clubs special events businesses Information sent request FLI * HIRT 5132 DEL REV VEGAS NEVADA 702 878-162489102 PLANS7 MAP range plans England largest compre hensive world Buya plans handbook find out yourself handbook contains full details of thousands plans prices plans available US agents listed handbooks Aeromodeiling Model Boats Cars Modei Engineering Radio ControlAircraft model Allied MAP PUbli wtiom Ltd runners sanitary engineers clean up end day Half-A judges test pilots judging practice Monday July 30 Contact Lanny 661 Louie Avenue Lodi CA 95240 tel 209 3689492 request has made infor mation Cobra originally designed Steve Wooley 35-size ship classic style turtle deck long slim fuselage similar Ares Steve built Cobra sometime 1969 70 magazine article did appear now defunct American Aircraft Modeler until February 1971 Steve built few air planes preferring race sports cars unfortunately cause death racing accident 1970 talented flier professed dislike practicing however managed finish fourth World Championships 1960 66 68 third place 1962 Nats open second 58 Nats senior division Cobra modernization Wooleys Argus used 1960 World Champs Cobra approxi mately 580 sq wing 10375 root chord front moment arm 935 m rear moment arm 1375 stab approximately 25 in span Steve stated Cobra article plane slightly larger wing area flap area earlier Argus stab also larger Argus built late SOs very similar Bill Werwages Ares surprising since Bill Steve close friends Argus Cobra built Steve I-beam wings large wheel pants slim fuselages charac teristic Detroiter style stunt ships SOs early 60s Plans Cobra probably non existant since AAM went out business could obtain old copy maga zine article plans appeared article same applies Argus appeared American Modeler August 1961 Plans Ares Bill Werwage still available through Hobby Helpers 1543 StilIwell Avenue Bronx NY 10461 plan Group 560 Mike Ditrich 2402 Penna Avenue Erie PA 16503 has built succession of46 size Cobras I-beam wings very good airplanes will fly anything turn very well improvement over original Cobra might contact Mike some basic dimensions Unfor tunately could find picture Mikes airplanes time writing information stunt PAMPA write Wynn PauL 1640 Maywick Dr Lexington KY 40504 CL Speed/Hempel continued page 37 leakage due loosening part becomes extremely hot during pipe runs Dimensions shown Pipe Adapter drawing important clamp ID cylinder OD exactly same dimen sion prevent distortion tightening Further contour exhaust opening clamp good match cylinder exhaust added rpm 8 Pipe pipe purchased Dub Jett Dimensions shown drawing Tuned Pipe pipe made aluminum has aluminum soldered Make sure no leaks check after flight use Epoxy-Patch 1 iC black made Hysol Div Dexter Corp seal small leaks pipe adapter mounted engine pipe place distance plug center end pipe 10 Plug center pipe maximum diameter 7 7/16 9 Plug Although Gb-Bee plug yields higher non-piped rpm ground air performance pipe has disap pointing best performance use stock Cox plug machine OD Gb-Bee button configuration hold down Glow-Bee clamp generally use gasket plug blows on pipe flight Russian Roulette chance taking plug element ports damaging cylinder piston nature speed score marks too deep cylinder can lightly polished using following technique Make small aluminum expandable man drel fits cylinder Mount mandrel drill press lathe Place cylinder onto mandrel plenty Marvel Mystery Oil expand mandrel until just starts make contact cylinder walls Hold cylinder mandrel rotates stroking cylinder gently observe can get rid score marks method will usually need replace piston replace piston need start over honing lapping new piston fit plug must extremely tight before run prevent loosening flight loose plug will ininiediately cause engine go overlean Use two wrenches cylinder plug tighten plug properly 10 Prop have tried props have learned singie blade prop far fastest 1/2 speed single blade used date dimensioned Prop drawing Rev-Up 55 cut shown station 3 4 Prather Pitch Gauge reads S pitch 4 h tip Its balanced similarly standard prop have experimenting props 11 Ball Socket high rpm sooner later rod piston ball socket will loosen try judge tighten amount sound play using normal Kirn reset tool flat aluminum plate losing 50% pistons due distortion OD 108 Model Aviation ME AND MY RC 4 COLOR EXCLUSIVE RIGHTS FROM ROYAL CROWN COLA choice PLANE S BOAT CAR Ofl poly FLI CAP ester/ Cotton T-shirt Handbook Handbook 2 Handbook 3 Handbook 4 Available USA Price $150 including postage Sales Office PO Box 35 BrIdge Street Hemel Hempeteed Hens HP1 lEE England C/L Flyer SAFELOK LAUNCHER FEATURES plated 1/8 steel support member plated 3/32 manganese bronze moving parts 050 X aluminum anchor strap simple anchoring stake turf spike asphalt screw eye-bolt 6-32 T nut furnished board mounting 25 lb capacity will pull apart 125 Ibs spring biased restraint arm thrown open position release $495 pp USA WRITE ST CLAIR MODEL COMPONENTS P0 Box 5626 Eugene OR 97405 WHY PAY MORE big buy high performance *FIREBALL #H30 HOT 3 volts faster starts #S20 STANDARD 24 volts general use #C15 COOL 15 volts cures pre-ignifion ust fun stick FIRE BALL great engine runs * advanced98 FLASH STARTING0 UNEXCELLED POWEP LONGER LIFE0 LOWEST DRAIN GLOW PLUGS SWANSON ASSOCIATES P0 BOX 161WAYNE NEW JEMEY 07470 However use fixtures shown Reset Fixtures drawing designed Frank Garzon seldom lose piston Place aluminum anvil plug 1 X 1 anvil step facing upward assembly placed rigid flat surface insert piston face down against plug Place modified Kim tool against ball socket maintaining pressure As start hammer rotate tool frequently checking often bind rod piston socket Burrs will raised socket Kim tool Use Dremel tool deburring clean piston thoroughly soap water have lost cylinder hard burrs broke free 12 Running youre still reading exhausted Tam well conclude paragraph High-nitro fuels should used new Cox engine use K&B 100 Cox Gray 6/3 prop cut flat across tips aS dia break-in good engine after 1/2 hour running should tech 20 22000 rpm prop fuel open face pipe adapter Some fuel should evidence around first end during running signifying good shaft case fit adequate lubrication pipe speeds lubrication critical 70% nitro fuels 25 27000rpm prop indicative good performance pipe adapter usually add 2 3000 rpm ground rush break-in stage have seen tach changes 1 2000 rpm time accumulated engine Try different pistons particularly worn ones against tach improved results aforementioned rpm have initially attained SERVICES/MATERIALS 1 Cox Blank Cylinder Barrels Jack Fraher 3900 Greystone Ave Riverdale NY 10463 Tel 2125491743 2 Schnuerle Porting Service Pipe Adapter Mike Langlois 2408 west Cornwallis Dr Greensboro NC 27408 Tel 919288 5900 3 Pipe Adapters Dub Jett 4720 Aslibrook Dallas TX 75227 4 Shaft Chrome Cylinder/Case Hoain Machine work Gene Hempel 302 North Yale Dr Garland TX 75042 Tel 2142725210 5 For Information Nick Sher 815 Beech Rd Lassghorne PA 19047 Tel 2157575373 61/2 Parts Kaxtom Kraftsmassship PO Box 2699 Laguna Hills CA 92653 Gene Hempel 302 North Yale Dr Gar land TX 75042 CL Scale/Gretz continued page 38 dirty proffle model pushrods engine tank etc hanging out over place would have much drag scale model Just remember increased scale cross-section frontal area wont afitect models performance great extent unless accompanied increase weight Look fullscale Gee Bee racers relied smooth contours overcome huge frontal area Wing Loading meaning weight wing area ratio Power Loading weight thrust ratio keys good flight performance Wing Loading par ticular real difference between CL stunt CL scale model much drag frontal area Al Rabes well known stunt models good recent example So keep Focke-Wulf light aero-dynamically clean pos sible sure use braided steel control lines opposed dacron lines minimum drag Back Chris Would desirable stunting point view eliminate some three inches dihedral plans call know would remove lot scale appearance might flatter wing improve control line flying begier. Could should RC aile rons completed CL flaps Reply would check some photos three-view drawing use scale amount dihedral House Balsa may have increased dihedral RC flight Again can look some Al Rabes stunt models recent proof dihedral itself doesnt hinder stunting ability wing removable model Chris wouldnt make way Building wing model could save little weight access inside fuse isnt important RC version Likewise removable hatches other engine cowl would build too Remember light weight important hope stunt scale model problem using RC ailerons CL stunt type flaps fact area near wing tips could cause rocking motion range movement too extreme Never theless would definitely try using ailerons stunt flaps model type purpose would limit travel about vator travel starters other words maximum elevator 450 have about 15 flaps slight flap movement shouldnt cause trouble may extra edge need enable model some basic aerobatics Chris question about dihedral brings up something didnt have room talk about January column Most can grasp aircraft has fore aft balance point often mis takenly referred Center Gravity CG Actually Center Gravity refers See Drawing No 1 point airplane regardless airplanes attitude about can perfectly balanced point center aircrafts total weight Center Gravity includes fore aft balance point well balance points along aircrafts other axes 110 Model Aviation
Edition: Model Aviation - 1979/05
Page Numbers: 36, 37, 108, 110
BEFORE starting mnig mis monmn- column iem mention delighted hear some Inquisitive readers beginning wonder anyone ever read column difficult write about something have no feedback readers appeal keep cards letters comingeven its just say hi something wouid ilke share send especiaiiy pertains engine work may seem unimpor tant modeiers just starting interested ail sorts good poop boaters read column engine information Hope boaters write about engine problems solutions finally blackmailed Nick Sher writing article 1/2 speed Nick has done outstanding job making COX TD 04 perform extremely well has agreed share secrets months coiumn copy follows GENE HEMPEL has requested write article about 1/2 speed specif ically engine modifications information supplied accumulation knowledge experience such engine experts Remember 100 mph 1 12A wss sensational Using Schnuerie piped Cox engine single-blade propeller two-blades plc Nick Sher turned 12743 mph tells did Fuselage inverted showing power pod pipe pictures tell clear story installation details considerable rework done internally engineas text relates 36 Model Aviation Hot pan After break-lnsee text wilitach 20 22000 breakin fueiK&B 100 case pipe adapter 70% nitro fuel 25 27000 rpm indicative good performance pipe adapter usually add 2 3000 rpm ground Frank Garzon Dub Jett John Shannon Mike Langlois like has fun implement ideas plus few own last speed meet season Flushing New York using Schnuerle piped Cox single-bladed prop first Frank Garzon needle turned slightly lean 706 sec 12743 mph top shell ship rubbing against prop driver did fly again some techniques used achieve speed numbers article measured directly engine used Flushing meet have gone great lengths make measurements accu rately have too much respect hobby people may read otherwise TIpSOAV2A Speed 1 Crankcase Selection Place case Cox speed pan check flatness mounting lugs pan versus centerline shaft bearing centerline pan inspection tools available check shaft cylin der centerline alignments mounting lug flatness parallelism shaft bearing centerline 2 Shaft Selectioiu Locate obtain several shafts have thick counterweight web latest series Using depth microm eter select shaft has longest stroke ie measure stroke piston partially assembled engine changing shaft Remember 1/2 displacement can go 00504 cu according AMA rule book After measuring stroke check sure crank rod journal center looking down cylinder barrel top very important Before removing shaft case check front rear alignment shaft intake port relation case intake opening may have remove some metal either case shaft proper alignment 3 TDC Alignment Temporarily assem ble shaft case piston blank cylin der Tighten cylinder measure piston depth versus plug step depth cylinder piston top dead center using depth mike piston generally 005 007 above step Select metal gasket washer use stainless steel thick ness will cause alignment piston top glow plug step TDC washer placed under cylinder base mounting surface Make certain washer place during cylinder timing measurements 4 Engine Timing ShaftGrind open transfer hole shaft 0200 dia time port open 35 degrees ABDC close 65 degrees ATDC have shaft flash chromed polished fitted case honing case bearing hole timing modification crankshaft 550F11177FKTFT 050014II 0 RING HI TEMP PIPE ADAPTER accomplished following method 1 Paint some lay-out blue around port opening shaft 2 Insert shaft case mount degree wheel shaft assembled engine 3 Scribe opening closure lines shaft using sharp needle 4 After removing shaft case ready remove material shaft Dremel type tool carbide cutters b Blank CylinderScrew cylinder case sure forget metal washer GRIND DOWN KIRN RESET TOOL / FLAT EDGE 32 under cylinder base until tight Place mark exhaust port outlet should Now comes hard part Start cutting exhaust port opening first proceed port cylinder following dimensions Exhaust Port0355 width 0140 height radiused oomers Timing 172 degrees open ATDC Boost Port0200 width timing 126 degrees open ATDC Main Ports0300 base 0230 width port opening ports raked forward Timing 128 degrees open ATDC Locate piston slightly larger cylin der such will just start bottom cylinder Now ready start honing lapping cylinder match piston piston cylinder fit such piston falls through cylinder its own weight Top Dead Center both clean dry fitting piston cylinder wise check fit frequently make sure have gone too far 375 OD 300 D T U- 4 BRAZE 2-56 SCREW 5 Back Plate Machine crankcase lip such backplate cover tightened comes within 0015 shaft rod journal File slight flat top back plate cover prevent piston skirt interference Check seated cover does leak 6 Remaining Parts exception prop nut remaining parts stock including venturi using suction tank venturi larger stock approximately 0116 dia will 407 DIA j~265 LOj330 I- IAO5K 250 DIA LiALU ANVIL jqIDIA1PLUG ALU ANVIL RESET FIXTURES cause erratic running loss rpm needle valve assembly standard Kim variety prop nut machined aluminum stock drilled tapped aS 40 stud arrangement necessary properly retain single bladed prop 7 Pipe Adapter part key proper 2 015 BRASSSTA 2 WRAP AROUND I,- EPOXY SOLDER PROP pipe performance must made cor rectly no leaks material should ledloy steel closely matches cyl inder material thermally thus preventing Continued page 108 610 aD MATL OIOALU.2500D 200 ID -a 82I D PIPE May1979 37 1L1 9 SHIRT AMA WINGS AMA Wings 4 COLOR$650 PERMISSION FROM AMA Size S M L XL ostage custom work Clubs special events businesses Information sent request FLI * HIRT 5132 DEL REV VEGAS NEVADA 702 878-162489102 PLANS7 MAP range plans England largest compre hensive world Buya plans handbook find out yourself handbook contains full details of thousands plans prices plans available US agents listed handbooks Aeromodeiling Model Boats Cars Modei Engineering Radio ControlAircraft model Allied MAP PUbli wtiom Ltd runners sanitary engineers clean up end day Half-A judges test pilots judging practice Monday July 30 Contact Lanny 661 Louie Avenue Lodi CA 95240 tel 209 3689492 request has made infor mation Cobra originally designed Steve Wooley 35-size ship classic style turtle deck long slim fuselage similar Ares Steve built Cobra sometime 1969 70 magazine article did appear now defunct American Aircraft Modeler until February 1971 Steve built few air planes preferring race sports cars unfortunately cause death racing accident 1970 talented flier professed dislike practicing however managed finish fourth World Championships 1960 66 68 third place 1962 Nats open second 58 Nats senior division Cobra modernization Wooleys Argus used 1960 World Champs Cobra approxi mately 580 sq wing 10375 root chord front moment arm 935 m rear moment arm 1375 stab approximately 25 in span Steve stated Cobra article plane slightly larger wing area flap area earlier Argus stab also larger Argus built late SOs very similar Bill Werwages Ares surprising since Bill Steve close friends Argus Cobra built Steve I-beam wings large wheel pants slim fuselages charac teristic Detroiter style stunt ships SOs early 60s Plans Cobra probably non existant since AAM went out business could obtain old copy maga zine article plans appeared article same applies Argus appeared American Modeler August 1961 Plans Ares Bill Werwage still available through Hobby Helpers 1543 StilIwell Avenue Bronx NY 10461 plan Group 560 Mike Ditrich 2402 Penna Avenue Erie PA 16503 has built succession of46 size Cobras I-beam wings very good airplanes will fly anything turn very well improvement over original Cobra might contact Mike some basic dimensions Unfor tunately could find picture Mikes airplanes time writing information stunt PAMPA write Wynn PauL 1640 Maywick Dr Lexington KY 40504 CL Speed/Hempel continued page 37 leakage due loosening part becomes extremely hot during pipe runs Dimensions shown Pipe Adapter drawing important clamp ID cylinder OD exactly same dimen sion prevent distortion tightening Further contour exhaust opening clamp good match cylinder exhaust added rpm 8 Pipe pipe purchased Dub Jett Dimensions shown drawing Tuned Pipe pipe made aluminum has aluminum soldered Make sure no leaks check after flight use Epoxy-Patch 1 iC black made Hysol Div Dexter Corp seal small leaks pipe adapter mounted engine pipe place distance plug center end pipe 10 Plug center pipe maximum diameter 7 7/16 9 Plug Although Gb-Bee plug yields higher non-piped rpm ground air performance pipe has disap pointing best performance use stock Cox plug machine OD Gb-Bee button configuration hold down Glow-Bee clamp generally use gasket plug blows on pipe flight Russian Roulette chance taking plug element ports damaging cylinder piston nature speed score marks too deep cylinder can lightly polished using following technique Make small aluminum expandable man drel fits cylinder Mount mandrel drill press lathe Place cylinder onto mandrel plenty Marvel Mystery Oil expand mandrel until just starts make contact cylinder walls Hold cylinder mandrel rotates stroking cylinder gently observe can get rid score marks method will usually need replace piston replace piston need start over honing lapping new piston fit plug must extremely tight before run prevent loosening flight loose plug will ininiediately cause engine go overlean Use two wrenches cylinder plug tighten plug properly 10 Prop have tried props have learned singie blade prop far fastest 1/2 speed single blade used date dimensioned Prop drawing Rev-Up 55 cut shown station 3 4 Prather Pitch Gauge reads S pitch 4 h tip Its balanced similarly standard prop have experimenting props 11 Ball Socket high rpm sooner later rod piston ball socket will loosen try judge tighten amount sound play using normal Kirn reset tool flat aluminum plate losing 50% pistons due distortion OD 108 Model Aviation ME AND MY RC 4 COLOR EXCLUSIVE RIGHTS FROM ROYAL CROWN COLA choice PLANE S BOAT CAR Ofl poly FLI CAP ester/ Cotton T-shirt Handbook Handbook 2 Handbook 3 Handbook 4 Available USA Price $150 including postage Sales Office PO Box 35 BrIdge Street Hemel Hempeteed Hens HP1 lEE England C/L Flyer SAFELOK LAUNCHER FEATURES plated 1/8 steel support member plated 3/32 manganese bronze moving parts 050 X aluminum anchor strap simple anchoring stake turf spike asphalt screw eye-bolt 6-32 T nut furnished board mounting 25 lb capacity will pull apart 125 Ibs spring biased restraint arm thrown open position release $495 pp USA WRITE ST CLAIR MODEL COMPONENTS P0 Box 5626 Eugene OR 97405 WHY PAY MORE big buy high performance *FIREBALL #H30 HOT 3 volts faster starts #S20 STANDARD 24 volts general use #C15 COOL 15 volts cures pre-ignifion ust fun stick FIRE BALL great engine runs * advanced98 FLASH STARTING0 UNEXCELLED POWEP LONGER LIFE0 LOWEST DRAIN GLOW PLUGS SWANSON ASSOCIATES P0 BOX 161WAYNE NEW JEMEY 07470 However use fixtures shown Reset Fixtures drawing designed Frank Garzon seldom lose piston Place aluminum anvil plug 1 X 1 anvil step facing upward assembly placed rigid flat surface insert piston face down against plug Place modified Kim tool against ball socket maintaining pressure As start hammer rotate tool frequently checking often bind rod piston socket Burrs will raised socket Kim tool Use Dremel tool deburring clean piston thoroughly soap water have lost cylinder hard burrs broke free 12 Running youre still reading exhausted Tam well conclude paragraph High-nitro fuels should used new Cox engine use K&B 100 Cox Gray 6/3 prop cut flat across tips aS dia break-in good engine after 1/2 hour running should tech 20 22000 rpm prop fuel open face pipe adapter Some fuel should evidence around first end during running signifying good shaft case fit adequate lubrication pipe speeds lubrication critical 70% nitro fuels 25 27000rpm prop indicative good performance pipe adapter usually add 2 3000 rpm ground rush break-in stage have seen tach changes 1 2000 rpm time accumulated engine Try different pistons particularly worn ones against tach improved results aforementioned rpm have initially attained SERVICES/MATERIALS 1 Cox Blank Cylinder Barrels Jack Fraher 3900 Greystone Ave Riverdale NY 10463 Tel 2125491743 2 Schnuerle Porting Service Pipe Adapter Mike Langlois 2408 west Cornwallis Dr Greensboro NC 27408 Tel 919288 5900 3 Pipe Adapters Dub Jett 4720 Aslibrook Dallas TX 75227 4 Shaft Chrome Cylinder/Case Hoain Machine work Gene Hempel 302 North Yale Dr Garland TX 75042 Tel 2142725210 5 For Information Nick Sher 815 Beech Rd Lassghorne PA 19047 Tel 2157575373 61/2 Parts Kaxtom Kraftsmassship PO Box 2699 Laguna Hills CA 92653 Gene Hempel 302 North Yale Dr Gar land TX 75042 CL Scale/Gretz continued page 38 dirty proffle model pushrods engine tank etc hanging out over place would have much drag scale model Just remember increased scale cross-section frontal area wont afitect models performance great extent unless accompanied increase weight Look fullscale Gee Bee racers relied smooth contours overcome huge frontal area Wing Loading meaning weight wing area ratio Power Loading weight thrust ratio keys good flight performance Wing Loading par ticular real difference between CL stunt CL scale model much drag frontal area Al Rabes well known stunt models good recent example So keep Focke-Wulf light aero-dynamically clean pos sible sure use braided steel control lines opposed dacron lines minimum drag Back Chris Would desirable stunting point view eliminate some three inches dihedral plans call know would remove lot scale appearance might flatter wing improve control line flying begier. Could should RC aile rons completed CL flaps Reply would check some photos three-view drawing use scale amount dihedral House Balsa may have increased dihedral RC flight Again can look some Al Rabes stunt models recent proof dihedral itself doesnt hinder stunting ability wing removable model Chris wouldnt make way Building wing model could save little weight access inside fuse isnt important RC version Likewise removable hatches other engine cowl would build too Remember light weight important hope stunt scale model problem using RC ailerons CL stunt type flaps fact area near wing tips could cause rocking motion range movement too extreme Never theless would definitely try using ailerons stunt flaps model type purpose would limit travel about vator travel starters other words maximum elevator 450 have about 15 flaps slight flap movement shouldnt cause trouble may extra edge need enable model some basic aerobatics Chris question about dihedral brings up something didnt have room talk about January column Most can grasp aircraft has fore aft balance point often mis takenly referred Center Gravity CG Actually Center Gravity refers See Drawing No 1 point airplane regardless airplanes attitude about can perfectly balanced point center aircrafts total weight Center Gravity includes fore aft balance point well balance points along aircrafts other axes 110 Model Aviation