LAYMAN-GIERTZRETAINER RING CUT Speed EJGene Hem pet Tom Uplon X-15HEADFROM STOCK HEAD NEW BUTTON HEAD SQUISH BAND 125R3/16 CUT FOR 003 PISTON TO HEAD CLEARANCE realize full potential X-15 new head must made writers simply machine off center stock head leaving hole new button head Just follow drawing turning over months column Dave Layman Lars Giertz will tell go 180 mph ST-1SX have seen engines go 180 mph few comments may order need learn walk before can run 230 diameter restric tor 65% nitro 20% oil 15% methanol fuel might help become familiar &ystem cratering engine guest writers comments follow THE DAY has come engine manufacturers have caught up state art best custom racing engines Supertigre X-15 good ex ample off-the-shelf engine can made perform national record levels minimal modification Start removing head measure head clearance between TDC top sleeve should read 167 plus minus thousandth Write down what ever read Now disassemble en gine bearings will drop out sharp rap after heat case about 300 degrees use propane torch Mono kote heat gun oven Knock out rotor pin drift Wash everything laquer thinner scrub old tooth brush have access ultrasonic cleaner eve better off have found Heathkit model invaluable engine cleaning Now everything clean take back plate some 600 wet-or-dry sand paper oil carefully lap front surface piece plate glass until see nice color Inspect small burrs remove Exacto knife Reassemble rotor using two feeler gages between back rotor back plate clearance 006 Since must use tank reli able performance carburetor needs some attention use Rossi spray bar ST needle valve Rossi little coarse fine adjustments order get positive fuel draw times will have machine venturi insert limit diameter 250 Now lets set up crankshaft case bearings should spin very free hand lumpy feel Using telescopic gage mike ID crank bore case should about 004 larger crankshaft isnt hit carefully Dremel buffing wheel DuPont #7 rubbing compound Now slip rear bearing over crankshaft Re heat case fit crankshaft bearing assembly case using front bearing align everything Support back crank good size dowel give front bearing gentle tap seat firmly case Let cool com pletely give crank fast spin fingers Since assembled thing completely dry crank should spin happily least four five sec onds always rock stop crank pin 12 oclock position things dont feel just right try re-aligning bearings rapping back crank sides case front bearing does work heat case again lower temperature tap again crankshaft should slip out bearings quite freely bind indication slightly crooked bearing seat case take bearings back out inspect tiny burrs aluminum behind bearing seats engine may have cylinder/sleeve combination either ABC steel Continued page 102 April 1978 49 new carburetor set-up shown left venturi insert right Rossi needle valve New X-15 button head ring described text compared stock head pix Lars Giertz button head being turned lathe SAVE THE BENT-WINGED BIRD HEY MODELERS SUPPORT THE BLACK SHEEP SQUADRON MANY OF YOU COMPLAINED WHEN THE TV SERIES WAS CANCELLED NOW THAT ITS ON AGAIN LETS SUPPORT THE SHOW BY LETTING NBC HEAR FROM US PERSONAL LETTER IS BEST BUT EVEN VOTE WILL HELP THE KIDS WILL LOVE YOU FOR IT MAYBE YOUR WIFE WILL ADDRESS THE ENVELOPE FOR YOU DONT DELAY T NOW CLIP AND SEND TO ROBERT CONRAD BLACK SHEEP SQD NBC-TV 3000W Alameda Burbank CA 91523 YES MY FAMILY TUNES IN THE BLACK SHEEP SQD EVERY WEDNESDAY NIGHT AND WE LOVE IT SIGNED CITY STATE gain counts Send check money order payable Smithsonian Institution National Air Space Museum Pub lications Smithsonian Institution Wash ington DC 20560 Mine took about four weeks delivery also have simi lar volume entitled Rockets Missiles Spacecraft National Air Space Museum $150 75 postage handling charge per book Mike Gretz Box 162 Montezuma IA 50171 CL Aerobatics/Paul continued page 47 planes really flew well new McCoy engines Hurray Bill Netze band long standing fight Half-A As soon Rich gets settled out West hope have report little hot half-As Custom Master Products attending King Orange Internationals over new years holidays chance visit Gene Martines fantastic shop setup Jacksonville Florida Gene slowly organizing operation will definite asset stunt fliers continual quest needed items produced larger manufacturers April May should completely set up distribute very good Custom Master Mufflers very good adjustable handle weighs very light 3 oz ven turis building weights nose weights other items Write Gene catalog address given earlier article Fuel Tanks want 5-ounce larg er tank ST 46 HP 40 Fox 45 engine about source know presently Randy Hancock custom makes 008 tin plate tanks work art well worth $1000 plus postage prices Write him 541 Columbia Blvd Lexington KY 40508 tel 606-252-8137 Foam Wings Look another manufac turer custom stunt foam wings near future John Poynter Kirk Mul linnix California getting business will soon have price list catalog available interested price list write J & K foam wings 10261 Janice Lynn Cypress CA 90630 also have heard Arnold Stott gets relocated Texas intends start producing wings again substan tial basis Havent heard him am certain will let Model viation know ready produce Stunt Scoring Change good possibility scoring system pro posed September issue Model Aviation point awards 0-to-lO one-half point increments 0-10 points appearance 2 points starting within minute 6 points completion pattern will drawn up soon pro posed PAMPA membership via newsletter proposal accepted President Keith Trostle will propose CLCB next rules cycle Com ments should sent Keith information stunt PAMPA contact Wynn Paul 1640 Maywick Dr Lexington KY 40504 CL Speed/Hempel/Upton continued page 49 iron Either combination will work fine will need chrome steel sleeve insure good life consistent runs stock timing should 1330 intake 1730 exhaust dont have degree wheel check can measure ports top sleeve exhaust will come out 500 intake 596 sure mike piston carefully roundness size Somethimes skirt may hair fatter top carefully taper bottom piston 600 wet-or-dry lathe skirt just hair smaller diameter crown sleeve should drop-fit case little tight sand paper inside case clean again sleeve chromed inspect 102 Model Aviation New National CL Record holders trom Houston Speed Meet L II tars LlIerTz-LarI Dub Jett A/S John Shannon B/S Tom Upton-Gene Hempel F-40 Pat Hempel Senior C/S Ross LewisJunior B Profile Proto top sleeve unwanted chrome remove flashing carbide tool fine stone realize full potential engine must make new head simply machine off center stock head leave hole new button head Make button head according drawing cut combustion chamber first drilling #3 hole tap running -in ball end mill up until touches #3 hole make chamber milling additional 090 Now reassemble rest engine dry leaving plug out now can replace stock head bolts metric Allen Screws OS Max 405R11 replace ment set screws works fine Spin engine again before should still no binds anywhere piston drags TDC either will have lap piston rehone cylinder carefully until absolutely no bind top check ultimate fit compression seal put few drops Marvel Mystery Oil engine flip engine over few times prop should snap very smartly hold compression TDC least five seconds Remember tight engine does necessarily mean has good seal entire exercise have gone through has designed eliminate possible friction Careful honing lapping will give perfect seal bind cylinder best fit will allow piston whistle right through yet seal perfectly Dont forget quirt some WD40 similar oil rear exhaust carb intake fully lubricate everything OK now fun part testing break-in Mix some fuel consisting 75% nitro 5% propelene oxide 20% Ucon 2270 Klotz sold SIG use cas tor oil under circumstances will gum up fine engine ruin fit use 75-5-20 time would advise forget about black magic fuel department Set up engine test stand K&B short plug bladder 6-7 Rev-Up tach prop Put four five 2-oz blad ders through engine fast four-cycle seat piston plug blows pull head clean out little beads element Now tach engine full rpm 10 15 seconds being sure let go too lean time should get some between 22500 23000 rpm will blow plug time better have few hand further check engine attach Rossi header pipe set II 3/s measured glowplug end pipe Still using 6-7 Rev-up tach should read around 26000rpm maybe little 6-8 Rev-up flying prop engine should capable 180mph Speed have questions call us Speed Racing Specialties 713 723RIC Model Spectacular exciting biggest Model Craft Show yet presenting panorama models planes helicopters cars boats Also U-control free-flight models Model demonstrations will again attract thousands indoors outdoors new Long Beach Convention Center has artificial outdoor lake boat demonstrations special indoor track will allow demonstration electric model cars giant MACS Hobby Contest open 6463 Houston Texas Gene Hempel Tom Upton 301 N Yale Garland TX 75042 Arrow Sport/Lidberg continued page 51 fuselage top wing fillets tip would use numerous small pie ces tissue cover fillet Make up wing struts bit longer shown plan youll able trim exact length leave off now As semble wing panels body 5-minute epoxy lightly tack glue tail surface place youll able change stabilizer angle major trim change needed Now ready dope color paint thin coat clear nitrate dope hobbyists will present 200 awards outstanding models crafts Hundreds entries will display throughout show Show hours during giant two-day-only show Saturday April 22 10am 8pm Sunday April23 11 am 6 pm Special dealer-only hours scheduled Sunday 9-11 am Long Beach Convention Center beautiful Long Beach CA Harbor MACS Model Crafts Shows Inc thats needed tissue no luck locating dark gray tissue match NC 1801s gun-metal gray sprayed very thin coat Gun Metal Gray Floquil model railroad paint over tissue Flo quil really covers wont take much plane has orange NC numbers trim arrow fuselage side narrow band wing panel covers balsa leading edge used Floquil too mask cut Zip-a-tone Med-tac Adhesive Film drafting art supply store stuff looks like sheet magic mending tape probably would work well spraying num bers trim NCs laid out tn high stroke width used l/16-in-high white stick-on letters/ numbers NCs rudder Use razor point marker outline control surfaces Make couple Xerox copies April 1978 103 8th Annual Model Craft Show April 22-23 Long Beach Convention Center MA Model Craft Shows Inc information call 714 986 8570
Edition: Model Aviation - 1978/04
Page Numbers: 49, 102, 103
LAYMAN-GIERTZRETAINER RING CUT Speed EJGene Hem pet Tom Uplon X-15HEADFROM STOCK HEAD NEW BUTTON HEAD SQUISH BAND 125R3/16 CUT FOR 003 PISTON TO HEAD CLEARANCE realize full potential X-15 new head must made writers simply machine off center stock head leaving hole new button head Just follow drawing turning over months column Dave Layman Lars Giertz will tell go 180 mph ST-1SX have seen engines go 180 mph few comments may order need learn walk before can run 230 diameter restric tor 65% nitro 20% oil 15% methanol fuel might help become familiar &ystem cratering engine guest writers comments follow THE DAY has come engine manufacturers have caught up state art best custom racing engines Supertigre X-15 good ex ample off-the-shelf engine can made perform national record levels minimal modification Start removing head measure head clearance between TDC top sleeve should read 167 plus minus thousandth Write down what ever read Now disassemble en gine bearings will drop out sharp rap after heat case about 300 degrees use propane torch Mono kote heat gun oven Knock out rotor pin drift Wash everything laquer thinner scrub old tooth brush have access ultrasonic cleaner eve better off have found Heathkit model invaluable engine cleaning Now everything clean take back plate some 600 wet-or-dry sand paper oil carefully lap front surface piece plate glass until see nice color Inspect small burrs remove Exacto knife Reassemble rotor using two feeler gages between back rotor back plate clearance 006 Since must use tank reli able performance carburetor needs some attention use Rossi spray bar ST needle valve Rossi little coarse fine adjustments order get positive fuel draw times will have machine venturi insert limit diameter 250 Now lets set up crankshaft case bearings should spin very free hand lumpy feel Using telescopic gage mike ID crank bore case should about 004 larger crankshaft isnt hit carefully Dremel buffing wheel DuPont #7 rubbing compound Now slip rear bearing over crankshaft Re heat case fit crankshaft bearing assembly case using front bearing align everything Support back crank good size dowel give front bearing gentle tap seat firmly case Let cool com pletely give crank fast spin fingers Since assembled thing completely dry crank should spin happily least four five sec onds always rock stop crank pin 12 oclock position things dont feel just right try re-aligning bearings rapping back crank sides case front bearing does work heat case again lower temperature tap again crankshaft should slip out bearings quite freely bind indication slightly crooked bearing seat case take bearings back out inspect tiny burrs aluminum behind bearing seats engine may have cylinder/sleeve combination either ABC steel Continued page 102 April 1978 49 new carburetor set-up shown left venturi insert right Rossi needle valve New X-15 button head ring described text compared stock head pix Lars Giertz button head being turned lathe SAVE THE BENT-WINGED BIRD HEY MODELERS SUPPORT THE BLACK SHEEP SQUADRON MANY OF YOU COMPLAINED WHEN THE TV SERIES WAS CANCELLED NOW THAT ITS ON AGAIN LETS SUPPORT THE SHOW BY LETTING NBC HEAR FROM US PERSONAL LETTER IS BEST BUT EVEN VOTE WILL HELP THE KIDS WILL LOVE YOU FOR IT MAYBE YOUR WIFE WILL ADDRESS THE ENVELOPE FOR YOU DONT DELAY T NOW CLIP AND SEND TO ROBERT CONRAD BLACK SHEEP SQD NBC-TV 3000W Alameda Burbank CA 91523 YES MY FAMILY TUNES IN THE BLACK SHEEP SQD EVERY WEDNESDAY NIGHT AND WE LOVE IT SIGNED CITY STATE gain counts Send check money order payable Smithsonian Institution National Air Space Museum Pub lications Smithsonian Institution Wash ington DC 20560 Mine took about four weeks delivery also have simi lar volume entitled Rockets Missiles Spacecraft National Air Space Museum $150 75 postage handling charge per book Mike Gretz Box 162 Montezuma IA 50171 CL Aerobatics/Paul continued page 47 planes really flew well new McCoy engines Hurray Bill Netze band long standing fight Half-A As soon Rich gets settled out West hope have report little hot half-As Custom Master Products attending King Orange Internationals over new years holidays chance visit Gene Martines fantastic shop setup Jacksonville Florida Gene slowly organizing operation will definite asset stunt fliers continual quest needed items produced larger manufacturers April May should completely set up distribute very good Custom Master Mufflers very good adjustable handle weighs very light 3 oz ven turis building weights nose weights other items Write Gene catalog address given earlier article Fuel Tanks want 5-ounce larg er tank ST 46 HP 40 Fox 45 engine about source know presently Randy Hancock custom makes 008 tin plate tanks work art well worth $1000 plus postage prices Write him 541 Columbia Blvd Lexington KY 40508 tel 606-252-8137 Foam Wings Look another manufac turer custom stunt foam wings near future John Poynter Kirk Mul linnix California getting business will soon have price list catalog available interested price list write J & K foam wings 10261 Janice Lynn Cypress CA 90630 also have heard Arnold Stott gets relocated Texas intends start producing wings again substan tial basis Havent heard him am certain will let Model viation know ready produce Stunt Scoring Change good possibility scoring system pro posed September issue Model Aviation point awards 0-to-lO one-half point increments 0-10 points appearance 2 points starting within minute 6 points completion pattern will drawn up soon pro posed PAMPA membership via newsletter proposal accepted President Keith Trostle will propose CLCB next rules cycle Com ments should sent Keith information stunt PAMPA contact Wynn Paul 1640 Maywick Dr Lexington KY 40504 CL Speed/Hempel/Upton continued page 49 iron Either combination will work fine will need chrome steel sleeve insure good life consistent runs stock timing should 1330 intake 1730 exhaust dont have degree wheel check can measure ports top sleeve exhaust will come out 500 intake 596 sure mike piston carefully roundness size Somethimes skirt may hair fatter top carefully taper bottom piston 600 wet-or-dry lathe skirt just hair smaller diameter crown sleeve should drop-fit case little tight sand paper inside case clean again sleeve chromed inspect 102 Model Aviation New National CL Record holders trom Houston Speed Meet L II tars LlIerTz-LarI Dub Jett A/S John Shannon B/S Tom Upton-Gene Hempel F-40 Pat Hempel Senior C/S Ross LewisJunior B Profile Proto top sleeve unwanted chrome remove flashing carbide tool fine stone realize full potential engine must make new head simply machine off center stock head leave hole new button head Make button head according drawing cut combustion chamber first drilling #3 hole tap running -in ball end mill up until touches #3 hole make chamber milling additional 090 Now reassemble rest engine dry leaving plug out now can replace stock head bolts metric Allen Screws OS Max 405R11 replace ment set screws works fine Spin engine again before should still no binds anywhere piston drags TDC either will have lap piston rehone cylinder carefully until absolutely no bind top check ultimate fit compression seal put few drops Marvel Mystery Oil engine flip engine over few times prop should snap very smartly hold compression TDC least five seconds Remember tight engine does necessarily mean has good seal entire exercise have gone through has designed eliminate possible friction Careful honing lapping will give perfect seal bind cylinder best fit will allow piston whistle right through yet seal perfectly Dont forget quirt some WD40 similar oil rear exhaust carb intake fully lubricate everything OK now fun part testing break-in Mix some fuel consisting 75% nitro 5% propelene oxide 20% Ucon 2270 Klotz sold SIG use cas tor oil under circumstances will gum up fine engine ruin fit use 75-5-20 time would advise forget about black magic fuel department Set up engine test stand K&B short plug bladder 6-7 Rev-Up tach prop Put four five 2-oz blad ders through engine fast four-cycle seat piston plug blows pull head clean out little beads element Now tach engine full rpm 10 15 seconds being sure let go too lean time should get some between 22500 23000 rpm will blow plug time better have few hand further check engine attach Rossi header pipe set II 3/s measured glowplug end pipe Still using 6-7 Rev-up tach should read around 26000rpm maybe little 6-8 Rev-up flying prop engine should capable 180mph Speed have questions call us Speed Racing Specialties 713 723RIC Model Spectacular exciting biggest Model Craft Show yet presenting panorama models planes helicopters cars boats Also U-control free-flight models Model demonstrations will again attract thousands indoors outdoors new Long Beach Convention Center has artificial outdoor lake boat demonstrations special indoor track will allow demonstration electric model cars giant MACS Hobby Contest open 6463 Houston Texas Gene Hempel Tom Upton 301 N Yale Garland TX 75042 Arrow Sport/Lidberg continued page 51 fuselage top wing fillets tip would use numerous small pie ces tissue cover fillet Make up wing struts bit longer shown plan youll able trim exact length leave off now As semble wing panels body 5-minute epoxy lightly tack glue tail surface place youll able change stabilizer angle major trim change needed Now ready dope color paint thin coat clear nitrate dope hobbyists will present 200 awards outstanding models crafts Hundreds entries will display throughout show Show hours during giant two-day-only show Saturday April 22 10am 8pm Sunday April23 11 am 6 pm Special dealer-only hours scheduled Sunday 9-11 am Long Beach Convention Center beautiful Long Beach CA Harbor MACS Model Crafts Shows Inc thats needed tissue no luck locating dark gray tissue match NC 1801s gun-metal gray sprayed very thin coat Gun Metal Gray Floquil model railroad paint over tissue Flo quil really covers wont take much plane has orange NC numbers trim arrow fuselage side narrow band wing panel covers balsa leading edge used Floquil too mask cut Zip-a-tone Med-tac Adhesive Film drafting art supply store stuff looks like sheet magic mending tape probably would work well spraying num bers trim NCs laid out tn high stroke width used l/16-in-high white stick-on letters/ numbers NCs rudder Use razor point marker outline control surfaces Make couple Xerox copies April 1978 103 8th Annual Model Craft Show April 22-23 Long Beach Convention Center MA Model Craft Shows Inc information call 714 986 8570
Edition: Model Aviation - 1978/04
Page Numbers: 49, 102, 103
LAYMAN-GIERTZRETAINER RING CUT Speed EJGene Hem pet Tom Uplon X-15HEADFROM STOCK HEAD NEW BUTTON HEAD SQUISH BAND 125R3/16 CUT FOR 003 PISTON TO HEAD CLEARANCE realize full potential X-15 new head must made writers simply machine off center stock head leaving hole new button head Just follow drawing turning over months column Dave Layman Lars Giertz will tell go 180 mph ST-1SX have seen engines go 180 mph few comments may order need learn walk before can run 230 diameter restric tor 65% nitro 20% oil 15% methanol fuel might help become familiar &ystem cratering engine guest writers comments follow THE DAY has come engine manufacturers have caught up state art best custom racing engines Supertigre X-15 good ex ample off-the-shelf engine can made perform national record levels minimal modification Start removing head measure head clearance between TDC top sleeve should read 167 plus minus thousandth Write down what ever read Now disassemble en gine bearings will drop out sharp rap after heat case about 300 degrees use propane torch Mono kote heat gun oven Knock out rotor pin drift Wash everything laquer thinner scrub old tooth brush have access ultrasonic cleaner eve better off have found Heathkit model invaluable engine cleaning Now everything clean take back plate some 600 wet-or-dry sand paper oil carefully lap front surface piece plate glass until see nice color Inspect small burrs remove Exacto knife Reassemble rotor using two feeler gages between back rotor back plate clearance 006 Since must use tank reli able performance carburetor needs some attention use Rossi spray bar ST needle valve Rossi little coarse fine adjustments order get positive fuel draw times will have machine venturi insert limit diameter 250 Now lets set up crankshaft case bearings should spin very free hand lumpy feel Using telescopic gage mike ID crank bore case should about 004 larger crankshaft isnt hit carefully Dremel buffing wheel DuPont #7 rubbing compound Now slip rear bearing over crankshaft Re heat case fit crankshaft bearing assembly case using front bearing align everything Support back crank good size dowel give front bearing gentle tap seat firmly case Let cool com pletely give crank fast spin fingers Since assembled thing completely dry crank should spin happily least four five sec onds always rock stop crank pin 12 oclock position things dont feel just right try re-aligning bearings rapping back crank sides case front bearing does work heat case again lower temperature tap again crankshaft should slip out bearings quite freely bind indication slightly crooked bearing seat case take bearings back out inspect tiny burrs aluminum behind bearing seats engine may have cylinder/sleeve combination either ABC steel Continued page 102 April 1978 49 new carburetor set-up shown left venturi insert right Rossi needle valve New X-15 button head ring described text compared stock head pix Lars Giertz button head being turned lathe SAVE THE BENT-WINGED BIRD HEY MODELERS SUPPORT THE BLACK SHEEP SQUADRON MANY OF YOU COMPLAINED WHEN THE TV SERIES WAS CANCELLED NOW THAT ITS ON AGAIN LETS SUPPORT THE SHOW BY LETTING NBC HEAR FROM US PERSONAL LETTER IS BEST BUT EVEN VOTE WILL HELP THE KIDS WILL LOVE YOU FOR IT MAYBE YOUR WIFE WILL ADDRESS THE ENVELOPE FOR YOU DONT DELAY T NOW CLIP AND SEND TO ROBERT CONRAD BLACK SHEEP SQD NBC-TV 3000W Alameda Burbank CA 91523 YES MY FAMILY TUNES IN THE BLACK SHEEP SQD EVERY WEDNESDAY NIGHT AND WE LOVE IT SIGNED CITY STATE gain counts Send check money order payable Smithsonian Institution National Air Space Museum Pub lications Smithsonian Institution Wash ington DC 20560 Mine took about four weeks delivery also have simi lar volume entitled Rockets Missiles Spacecraft National Air Space Museum $150 75 postage handling charge per book Mike Gretz Box 162 Montezuma IA 50171 CL Aerobatics/Paul continued page 47 planes really flew well new McCoy engines Hurray Bill Netze band long standing fight Half-A As soon Rich gets settled out West hope have report little hot half-As Custom Master Products attending King Orange Internationals over new years holidays chance visit Gene Martines fantastic shop setup Jacksonville Florida Gene slowly organizing operation will definite asset stunt fliers continual quest needed items produced larger manufacturers April May should completely set up distribute very good Custom Master Mufflers very good adjustable handle weighs very light 3 oz ven turis building weights nose weights other items Write Gene catalog address given earlier article Fuel Tanks want 5-ounce larg er tank ST 46 HP 40 Fox 45 engine about source know presently Randy Hancock custom makes 008 tin plate tanks work art well worth $1000 plus postage prices Write him 541 Columbia Blvd Lexington KY 40508 tel 606-252-8137 Foam Wings Look another manufac turer custom stunt foam wings near future John Poynter Kirk Mul linnix California getting business will soon have price list catalog available interested price list write J & K foam wings 10261 Janice Lynn Cypress CA 90630 also have heard Arnold Stott gets relocated Texas intends start producing wings again substan tial basis Havent heard him am certain will let Model viation know ready produce Stunt Scoring Change good possibility scoring system pro posed September issue Model Aviation point awards 0-to-lO one-half point increments 0-10 points appearance 2 points starting within minute 6 points completion pattern will drawn up soon pro posed PAMPA membership via newsletter proposal accepted President Keith Trostle will propose CLCB next rules cycle Com ments should sent Keith information stunt PAMPA contact Wynn Paul 1640 Maywick Dr Lexington KY 40504 CL Speed/Hempel/Upton continued page 49 iron Either combination will work fine will need chrome steel sleeve insure good life consistent runs stock timing should 1330 intake 1730 exhaust dont have degree wheel check can measure ports top sleeve exhaust will come out 500 intake 596 sure mike piston carefully roundness size Somethimes skirt may hair fatter top carefully taper bottom piston 600 wet-or-dry lathe skirt just hair smaller diameter crown sleeve should drop-fit case little tight sand paper inside case clean again sleeve chromed inspect 102 Model Aviation New National CL Record holders trom Houston Speed Meet L II tars LlIerTz-LarI Dub Jett A/S John Shannon B/S Tom Upton-Gene Hempel F-40 Pat Hempel Senior C/S Ross LewisJunior B Profile Proto top sleeve unwanted chrome remove flashing carbide tool fine stone realize full potential engine must make new head simply machine off center stock head leave hole new button head Make button head according drawing cut combustion chamber first drilling #3 hole tap running -in ball end mill up until touches #3 hole make chamber milling additional 090 Now reassemble rest engine dry leaving plug out now can replace stock head bolts metric Allen Screws OS Max 405R11 replace ment set screws works fine Spin engine again before should still no binds anywhere piston drags TDC either will have lap piston rehone cylinder carefully until absolutely no bind top check ultimate fit compression seal put few drops Marvel Mystery Oil engine flip engine over few times prop should snap very smartly hold compression TDC least five seconds Remember tight engine does necessarily mean has good seal entire exercise have gone through has designed eliminate possible friction Careful honing lapping will give perfect seal bind cylinder best fit will allow piston whistle right through yet seal perfectly Dont forget quirt some WD40 similar oil rear exhaust carb intake fully lubricate everything OK now fun part testing break-in Mix some fuel consisting 75% nitro 5% propelene oxide 20% Ucon 2270 Klotz sold SIG use cas tor oil under circumstances will gum up fine engine ruin fit use 75-5-20 time would advise forget about black magic fuel department Set up engine test stand K&B short plug bladder 6-7 Rev-Up tach prop Put four five 2-oz blad ders through engine fast four-cycle seat piston plug blows pull head clean out little beads element Now tach engine full rpm 10 15 seconds being sure let go too lean time should get some between 22500 23000 rpm will blow plug time better have few hand further check engine attach Rossi header pipe set II 3/s measured glowplug end pipe Still using 6-7 Rev-up tach should read around 26000rpm maybe little 6-8 Rev-up flying prop engine should capable 180mph Speed have questions call us Speed Racing Specialties 713 723RIC Model Spectacular exciting biggest Model Craft Show yet presenting panorama models planes helicopters cars boats Also U-control free-flight models Model demonstrations will again attract thousands indoors outdoors new Long Beach Convention Center has artificial outdoor lake boat demonstrations special indoor track will allow demonstration electric model cars giant MACS Hobby Contest open 6463 Houston Texas Gene Hempel Tom Upton 301 N Yale Garland TX 75042 Arrow Sport/Lidberg continued page 51 fuselage top wing fillets tip would use numerous small pie ces tissue cover fillet Make up wing struts bit longer shown plan youll able trim exact length leave off now As semble wing panels body 5-minute epoxy lightly tack glue tail surface place youll able change stabilizer angle major trim change needed Now ready dope color paint thin coat clear nitrate dope hobbyists will present 200 awards outstanding models crafts Hundreds entries will display throughout show Show hours during giant two-day-only show Saturday April 22 10am 8pm Sunday April23 11 am 6 pm Special dealer-only hours scheduled Sunday 9-11 am Long Beach Convention Center beautiful Long Beach CA Harbor MACS Model Crafts Shows Inc thats needed tissue no luck locating dark gray tissue match NC 1801s gun-metal gray sprayed very thin coat Gun Metal Gray Floquil model railroad paint over tissue Flo quil really covers wont take much plane has orange NC numbers trim arrow fuselage side narrow band wing panel covers balsa leading edge used Floquil too mask cut Zip-a-tone Med-tac Adhesive Film drafting art supply store stuff looks like sheet magic mending tape probably would work well spraying num bers trim NCs laid out tn high stroke width used l/16-in-high white stick-on letters/ numbers NCs rudder Use razor point marker outline control surfaces Make couple Xerox copies April 1978 103 8th Annual Model Craft Show April 22-23 Long Beach Convention Center MA Model Craft Shows Inc information call 714 986 8570