Control Line IVE BEEN receiving quite few letters phone calls about new scoring sys tem Navy Carrier Some ques tions points would computed others comments scoring sys tem itself modeler concerned Carrier would survive until scoring could changed back old system two years others hap py see some reduction emphasis high speed Carrier pattern emerged let ters people going fly ing Carrier next year big reason seems general feeling since new rules have reduced emphasis high speed Carrier modelers can now compete effectively going bank rupt buying super-hot engines rule book quite clear new scoring thing has really changed low speed score Low speed points now calculated dividing high speed low speed multiply ing ten same result obtained dividing low speed time seconds high speed time multiplying result ten using latter method new system takes no longer figure hand did old method since necessary convert low speed time miles per hour An electronic pocket calculator makes score computation really easy using formula 179 928 Speed Time X 10 High Speed Time 120 IA 100 0 Lii ui9O 0 80 70 Navy Carrier flight score high speed points plus low speed points can computed matter seconds substituting 180 179928 accurary will suffer greatly time will saved method 15 2 25 3 ..LOW.-30 25 SPEED I I I II I I15 I II II 1975 RULES I1976 RULES II 4 23 4 5 6 SCORE RATIO 78 Richard 1 Perry should used computing scores national record purposes because will occasionally give answers 1/10 point too high reason high speed score rounded nearest 1/10 point before low speed score added have access programable calculator have program Texas Instrument calculators hope finish Hewlett-Packard soon program does necessary rounding does suffer problem men tioned above also computes scores using 1975 rules comparison pur poses want program sheets send 25 to cover reproduction mailing specify brand calcu lator have have tried use calculator outdoors have discovered some calculator displays cannot read bright sunlight solved problem technique used Ace R/C trans mitters RC does have few things teach CL modelers use rectangular tube about two inches long made black construction paper folded just fit calculator display tube taped over display excludes ex cess light display can read looking through tube Some modelers felt under old rules Navy Carrier evolved little Proto Speed event land ing requirement analogy little extreme true emphasis continued page 89 30 Model Aviation K&B 65cc engine HP 61 throttle crankcase pressure used Harry Higley Class Does use exhaust restrictor carb Base throttle turned down fit KIT NO 247 Sole Canadian DistributorCanadian Aero Modeicraft Ltd195 Grand Prix BlvdLAnAdie OIIAhAC bIDWEST PRODUCTS CO L400 South Indiana StHobartlndana 46342 p Designed Ed Bridant. SPAN 35-1/2 ins ENGINES 15l9cuin QUICK SMOOTH TIGHT TURNING ieose send illustrated ca lalog1 models accessoriesl enclose 25u Name State _____________________ Zip __________________ 1 CL Navy Carrier/Perry continued page 30 high speed made phase flight very important Roger Edwards holds Class II records time writing 3399 3420 published comprehen sive analysis new scoring system Duke City Dope Sheet Albu querque Thunderbirds Rogers article stressed increased importance low speed landing points showed low speed below about 23 mph Profile 27mph Class land II 1 mph reduction low speed worth 1 mph increase high speed Although people think terms mph comparing scoring systems prefer work percentage changes because one-mph change much larger change low speed high speed observing contest scores can see usually about 7 8 mph spread low speeds high speeds usually vary around 25 mph dem onstrates ranges speeds have work making improvements shows think percentage changes give better picture what happening graph shows effect per cent change high speed compared percent change low speed Score Ratio along bottom graph shows relative importance high speed improvements low speed improve ments both 1975 1976 rules Score Ratio 5 100 mph 27 mph under 1975 rules means percentage improvement high speed worth 5 times equal percentage change low speed same speeds under new rules high speed 36 times important low speed look graph shows two important changes First high speed no longer has effect score ratio Second effect improving low speed has reversed Under old rules improve ment either high low speed caused increase relative importance high speed score new rules importance high speed constant regardless value high speed As low speeds improved under new rules relative importance high speed reduced What means modelers lighter cheaper reliable RC type engine some practice improve flying skills can used effectively against hot racing engines high speed still relatively important low speed hot engine can no longer count ed compensate poor low speed missed landing Flying skill air craft design construction technique have increased importance good consistent performance will go unre warded effect apparent Profile Carrier Modified engines now legal Profile event Profile speed ranges 65 90 mph 15 22 mphthat greatest reduction high speed emphasis has occurred result Steerable Nose Gear New Carl Goldberg two steerable nose gears features answer expressed needs field first larger multis 5132 gear features adjustable axle can placed suit strut accommodate special re quired wheel location Price $329 sec ond medium-sized models features 1/8 wire greater strength Strut angle permits direct wheel centering Price $250 Both al low in-front-of-or-behind firewall mount ing have nylon steering arms can flex mounted left right high low nylon base Carl Goldberg Models 4734 West Chicago Ave Chicago III 60651 June 1976 89 U MIDWEST PRODUCTS COMPANY KIT CONTENTS die cut balsa plywood Strip sheet wire hardware bellcrank control horn tubing need covering lines engine supply tankfi ref Address City skilled pilot good plane unmodified engine should getting share trophies handed out Some designers going larger air planes effort improve scores Detroit area modelers have moving direction past couple years weight engine fuel system controls essentially constant larger model will have lighter wing loading should able fly slower slight reduction high speed now compensated improved low speed performance larger models easier handle low speed Some modelers taking advantage reduced emphasis brute power build dual-purpose airplanes ships will compete Class Supertigre 40 Class II Supertigre 46 weighs same has same mounting 40 Engines dissimi lar mounting holes could used just well using RC type radial engine mount changing mount along engine Speed Control Harry Higley reports good success K&B 65 cc engine using HP 61 throttle crankcase pressure Harry does use exhaust restrictor carb HP carb available through Nelson Model Products Chicago modification needed turn down base throttle will fit K&B backplate New Products mentioned new G-S Products Corp three-line handle review G-S bellcrank last year Ive chance look production ver sions both units look good Both operate very freely handle similar Sturdi-built handle some important changes G-S handle uses steel throughout instead aluminum G-S unit has 24% greater throttle movement throttle trigger posi tioned loser rear handle much comfortable probably anyone else flies hand G-S handle has much clearance around lines exit handle low throttle handle can moved up down 600 before lines contact handle framea four-fold improvement area G-S Products Corp Intl PO Box 488 LaGrande OR 97850 address 5016 Angelita Ave Dayton OH 45424 RC Scale/Atkinson continued page 77 military aircraft three-views Famous Fighters Second World War Wil ham Green printed England Coverage extensive several volumes fighters others bombers books may obtained book stores throughout country maintain aviation section Smithsonian Institution Washing ton DC excellent source mili tary aircraft pictures three-views have service public cost actual cost printing pictures and/or three-views aircraft ever produced military Smithsonian will have record cluding one-of-a-kind unusual sub jects Write Smithsonian giving name designation aircraft seeking will advise cost what information have usually takes four six weeks because have requests pic ture XP-81 column example excellent photographs rare birdonly two three built turbo-prop Note blacked out number tail nose picture taken later years WW II obtained picture Smithsonian Institution several years ago address National Air Museum Washington DC subject three-views drawings probably largest col lections scale plans kits affiliated parts such glass cowls canopies spin ners etc stocked Bob Holman Plans PO Box 741 San Bernardino CA 92402 Bob has dozens cetailed scale plans some worlds best scale build ers constantly expanding scale kit line just too men tion drop Bob line obtain complete catalog fine line scale plans kits address 734 North Sixth St Terrace Blue Springs MO 64015 QuickSilver continued page 8 nitro content atutomatically elimi nates castor oil fuel mix just will blend will need 100% synthetic oil like Klotz Ucon careful because Klotz also markets 2-cycle oil labeled Racing Oil 100% synthetic contains substantial percent age bean oil ideal applications kind fuel mix talked John Klotz about gave following identifying numbers 100% synthetic KL-200 KL-208 KL-300 labeled high performance snowmobile oil same others Use least 20% oil mix 22% preferable benefits will immediately notice 100% synthetic oil fuel clean burns top piston will stay looking brand new will never have clean out varnish formations re mainder fuel mix methanol minimum percentage 5% Dont try run nitro oil will result severe detonation get competitive engine up good great wish could give straightforward answer difference appears fit crankshaft crankcase compression ratio size cylinder bypass ports really good engine Ive seen wide bypasses Get few cylinders gether examination youll soon see difference ports Jim Chary Racing offered reworked cylinder wide deep raised ports Un90 Model Aviation CL Navy Carrier continued Langleys Model Aero Engine 1903 Robert Meyer Curator National Air & Space Museum Smithsonian Institution Illustrated orical Collectors Item $500 Cumberland Press 4926 Del Ray Avenue Bethesda Maryland 20014
Edition: Model Aviation - 1976/06
Page Numbers: 30, 89, 90
Control Line IVE BEEN receiving quite few letters phone calls about new scoring sys tem Navy Carrier Some ques tions points would computed others comments scoring sys tem itself modeler concerned Carrier would survive until scoring could changed back old system two years others hap py see some reduction emphasis high speed Carrier pattern emerged let ters people going fly ing Carrier next year big reason seems general feeling since new rules have reduced emphasis high speed Carrier modelers can now compete effectively going bank rupt buying super-hot engines rule book quite clear new scoring thing has really changed low speed score Low speed points now calculated dividing high speed low speed multiply ing ten same result obtained dividing low speed time seconds high speed time multiplying result ten using latter method new system takes no longer figure hand did old method since necessary convert low speed time miles per hour An electronic pocket calculator makes score computation really easy using formula 179 928 Speed Time X 10 High Speed Time 120 IA 100 0 Lii ui9O 0 80 70 Navy Carrier flight score high speed points plus low speed points can computed matter seconds substituting 180 179928 accurary will suffer greatly time will saved method 15 2 25 3 ..LOW.-30 25 SPEED I I I II I I15 I II II 1975 RULES I1976 RULES II 4 23 4 5 6 SCORE RATIO 78 Richard 1 Perry should used computing scores national record purposes because will occasionally give answers 1/10 point too high reason high speed score rounded nearest 1/10 point before low speed score added have access programable calculator have program Texas Instrument calculators hope finish Hewlett-Packard soon program does necessary rounding does suffer problem men tioned above also computes scores using 1975 rules comparison pur poses want program sheets send 25 to cover reproduction mailing specify brand calcu lator have have tried use calculator outdoors have discovered some calculator displays cannot read bright sunlight solved problem technique used Ace R/C trans mitters RC does have few things teach CL modelers use rectangular tube about two inches long made black construction paper folded just fit calculator display tube taped over display excludes ex cess light display can read looking through tube Some modelers felt under old rules Navy Carrier evolved little Proto Speed event land ing requirement analogy little extreme true emphasis continued page 89 30 Model Aviation K&B 65cc engine HP 61 throttle crankcase pressure used Harry Higley Class Does use exhaust restrictor carb Base throttle turned down fit KIT NO 247 Sole Canadian DistributorCanadian Aero Modeicraft Ltd195 Grand Prix BlvdLAnAdie OIIAhAC bIDWEST PRODUCTS CO L400 South Indiana StHobartlndana 46342 p Designed Ed Bridant. SPAN 35-1/2 ins ENGINES 15l9cuin QUICK SMOOTH TIGHT TURNING ieose send illustrated ca lalog1 models accessoriesl enclose 25u Name State _____________________ Zip __________________ 1 CL Navy Carrier/Perry continued page 30 high speed made phase flight very important Roger Edwards holds Class II records time writing 3399 3420 published comprehen sive analysis new scoring system Duke City Dope Sheet Albu querque Thunderbirds Rogers article stressed increased importance low speed landing points showed low speed below about 23 mph Profile 27mph Class land II 1 mph reduction low speed worth 1 mph increase high speed Although people think terms mph comparing scoring systems prefer work percentage changes because one-mph change much larger change low speed high speed observing contest scores can see usually about 7 8 mph spread low speeds high speeds usually vary around 25 mph dem onstrates ranges speeds have work making improvements shows think percentage changes give better picture what happening graph shows effect per cent change high speed compared percent change low speed Score Ratio along bottom graph shows relative importance high speed improvements low speed improve ments both 1975 1976 rules Score Ratio 5 100 mph 27 mph under 1975 rules means percentage improvement high speed worth 5 times equal percentage change low speed same speeds under new rules high speed 36 times important low speed look graph shows two important changes First high speed no longer has effect score ratio Second effect improving low speed has reversed Under old rules improve ment either high low speed caused increase relative importance high speed score new rules importance high speed constant regardless value high speed As low speeds improved under new rules relative importance high speed reduced What means modelers lighter cheaper reliable RC type engine some practice improve flying skills can used effectively against hot racing engines high speed still relatively important low speed hot engine can no longer count ed compensate poor low speed missed landing Flying skill air craft design construction technique have increased importance good consistent performance will go unre warded effect apparent Profile Carrier Modified engines now legal Profile event Profile speed ranges 65 90 mph 15 22 mphthat greatest reduction high speed emphasis has occurred result Steerable Nose Gear New Carl Goldberg two steerable nose gears features answer expressed needs field first larger multis 5132 gear features adjustable axle can placed suit strut accommodate special re quired wheel location Price $329 sec ond medium-sized models features 1/8 wire greater strength Strut angle permits direct wheel centering Price $250 Both al low in-front-of-or-behind firewall mount ing have nylon steering arms can flex mounted left right high low nylon base Carl Goldberg Models 4734 West Chicago Ave Chicago III 60651 June 1976 89 U MIDWEST PRODUCTS COMPANY KIT CONTENTS die cut balsa plywood Strip sheet wire hardware bellcrank control horn tubing need covering lines engine supply tankfi ref Address City skilled pilot good plane unmodified engine should getting share trophies handed out Some designers going larger air planes effort improve scores Detroit area modelers have moving direction past couple years weight engine fuel system controls essentially constant larger model will have lighter wing loading should able fly slower slight reduction high speed now compensated improved low speed performance larger models easier handle low speed Some modelers taking advantage reduced emphasis brute power build dual-purpose airplanes ships will compete Class Supertigre 40 Class II Supertigre 46 weighs same has same mounting 40 Engines dissimi lar mounting holes could used just well using RC type radial engine mount changing mount along engine Speed Control Harry Higley reports good success K&B 65 cc engine using HP 61 throttle crankcase pressure Harry does use exhaust restrictor carb HP carb available through Nelson Model Products Chicago modification needed turn down base throttle will fit K&B backplate New Products mentioned new G-S Products Corp three-line handle review G-S bellcrank last year Ive chance look production ver sions both units look good Both operate very freely handle similar Sturdi-built handle some important changes G-S handle uses steel throughout instead aluminum G-S unit has 24% greater throttle movement throttle trigger posi tioned loser rear handle much comfortable probably anyone else flies hand G-S handle has much clearance around lines exit handle low throttle handle can moved up down 600 before lines contact handle framea four-fold improvement area G-S Products Corp Intl PO Box 488 LaGrande OR 97850 address 5016 Angelita Ave Dayton OH 45424 RC Scale/Atkinson continued page 77 military aircraft three-views Famous Fighters Second World War Wil ham Green printed England Coverage extensive several volumes fighters others bombers books may obtained book stores throughout country maintain aviation section Smithsonian Institution Washing ton DC excellent source mili tary aircraft pictures three-views have service public cost actual cost printing pictures and/or three-views aircraft ever produced military Smithsonian will have record cluding one-of-a-kind unusual sub jects Write Smithsonian giving name designation aircraft seeking will advise cost what information have usually takes four six weeks because have requests pic ture XP-81 column example excellent photographs rare birdonly two three built turbo-prop Note blacked out number tail nose picture taken later years WW II obtained picture Smithsonian Institution several years ago address National Air Museum Washington DC subject three-views drawings probably largest col lections scale plans kits affiliated parts such glass cowls canopies spin ners etc stocked Bob Holman Plans PO Box 741 San Bernardino CA 92402 Bob has dozens cetailed scale plans some worlds best scale build ers constantly expanding scale kit line just too men tion drop Bob line obtain complete catalog fine line scale plans kits address 734 North Sixth St Terrace Blue Springs MO 64015 QuickSilver continued page 8 nitro content atutomatically elimi nates castor oil fuel mix just will blend will need 100% synthetic oil like Klotz Ucon careful because Klotz also markets 2-cycle oil labeled Racing Oil 100% synthetic contains substantial percent age bean oil ideal applications kind fuel mix talked John Klotz about gave following identifying numbers 100% synthetic KL-200 KL-208 KL-300 labeled high performance snowmobile oil same others Use least 20% oil mix 22% preferable benefits will immediately notice 100% synthetic oil fuel clean burns top piston will stay looking brand new will never have clean out varnish formations re mainder fuel mix methanol minimum percentage 5% Dont try run nitro oil will result severe detonation get competitive engine up good great wish could give straightforward answer difference appears fit crankshaft crankcase compression ratio size cylinder bypass ports really good engine Ive seen wide bypasses Get few cylinders gether examination youll soon see difference ports Jim Chary Racing offered reworked cylinder wide deep raised ports Un90 Model Aviation CL Navy Carrier continued Langleys Model Aero Engine 1903 Robert Meyer Curator National Air & Space Museum Smithsonian Institution Illustrated orical Collectors Item $500 Cumberland Press 4926 Del Ray Avenue Bethesda Maryland 20014
Edition: Model Aviation - 1976/06
Page Numbers: 30, 89, 90
Control Line IVE BEEN receiving quite few letters phone calls about new scoring sys tem Navy Carrier Some ques tions points would computed others comments scoring sys tem itself modeler concerned Carrier would survive until scoring could changed back old system two years others hap py see some reduction emphasis high speed Carrier pattern emerged let ters people going fly ing Carrier next year big reason seems general feeling since new rules have reduced emphasis high speed Carrier modelers can now compete effectively going bank rupt buying super-hot engines rule book quite clear new scoring thing has really changed low speed score Low speed points now calculated dividing high speed low speed multiply ing ten same result obtained dividing low speed time seconds high speed time multiplying result ten using latter method new system takes no longer figure hand did old method since necessary convert low speed time miles per hour An electronic pocket calculator makes score computation really easy using formula 179 928 Speed Time X 10 High Speed Time 120 IA 100 0 Lii ui9O 0 80 70 Navy Carrier flight score high speed points plus low speed points can computed matter seconds substituting 180 179928 accurary will suffer greatly time will saved method 15 2 25 3 ..LOW.-30 25 SPEED I I I II I I15 I II II 1975 RULES I1976 RULES II 4 23 4 5 6 SCORE RATIO 78 Richard 1 Perry should used computing scores national record purposes because will occasionally give answers 1/10 point too high reason high speed score rounded nearest 1/10 point before low speed score added have access programable calculator have program Texas Instrument calculators hope finish Hewlett-Packard soon program does necessary rounding does suffer problem men tioned above also computes scores using 1975 rules comparison pur poses want program sheets send 25 to cover reproduction mailing specify brand calcu lator have have tried use calculator outdoors have discovered some calculator displays cannot read bright sunlight solved problem technique used Ace R/C trans mitters RC does have few things teach CL modelers use rectangular tube about two inches long made black construction paper folded just fit calculator display tube taped over display excludes ex cess light display can read looking through tube Some modelers felt under old rules Navy Carrier evolved little Proto Speed event land ing requirement analogy little extreme true emphasis continued page 89 30 Model Aviation K&B 65cc engine HP 61 throttle crankcase pressure used Harry Higley Class Does use exhaust restrictor carb Base throttle turned down fit KIT NO 247 Sole Canadian DistributorCanadian Aero Modeicraft Ltd195 Grand Prix BlvdLAnAdie OIIAhAC bIDWEST PRODUCTS CO L400 South Indiana StHobartlndana 46342 p Designed Ed Bridant. SPAN 35-1/2 ins ENGINES 15l9cuin QUICK SMOOTH TIGHT TURNING ieose send illustrated ca lalog1 models accessoriesl enclose 25u Name State _____________________ Zip __________________ 1 CL Navy Carrier/Perry continued page 30 high speed made phase flight very important Roger Edwards holds Class II records time writing 3399 3420 published comprehen sive analysis new scoring system Duke City Dope Sheet Albu querque Thunderbirds Rogers article stressed increased importance low speed landing points showed low speed below about 23 mph Profile 27mph Class land II 1 mph reduction low speed worth 1 mph increase high speed Although people think terms mph comparing scoring systems prefer work percentage changes because one-mph change much larger change low speed high speed observing contest scores can see usually about 7 8 mph spread low speeds high speeds usually vary around 25 mph dem onstrates ranges speeds have work making improvements shows think percentage changes give better picture what happening graph shows effect per cent change high speed compared percent change low speed Score Ratio along bottom graph shows relative importance high speed improvements low speed improve ments both 1975 1976 rules Score Ratio 5 100 mph 27 mph under 1975 rules means percentage improvement high speed worth 5 times equal percentage change low speed same speeds under new rules high speed 36 times important low speed look graph shows two important changes First high speed no longer has effect score ratio Second effect improving low speed has reversed Under old rules improve ment either high low speed caused increase relative importance high speed score new rules importance high speed constant regardless value high speed As low speeds improved under new rules relative importance high speed reduced What means modelers lighter cheaper reliable RC type engine some practice improve flying skills can used effectively against hot racing engines high speed still relatively important low speed hot engine can no longer count ed compensate poor low speed missed landing Flying skill air craft design construction technique have increased importance good consistent performance will go unre warded effect apparent Profile Carrier Modified engines now legal Profile event Profile speed ranges 65 90 mph 15 22 mphthat greatest reduction high speed emphasis has occurred result Steerable Nose Gear New Carl Goldberg two steerable nose gears features answer expressed needs field first larger multis 5132 gear features adjustable axle can placed suit strut accommodate special re quired wheel location Price $329 sec ond medium-sized models features 1/8 wire greater strength Strut angle permits direct wheel centering Price $250 Both al low in-front-of-or-behind firewall mount ing have nylon steering arms can flex mounted left right high low nylon base Carl Goldberg Models 4734 West Chicago Ave Chicago III 60651 June 1976 89 U MIDWEST PRODUCTS COMPANY KIT CONTENTS die cut balsa plywood Strip sheet wire hardware bellcrank control horn tubing need covering lines engine supply tankfi ref Address City skilled pilot good plane unmodified engine should getting share trophies handed out Some designers going larger air planes effort improve scores Detroit area modelers have moving direction past couple years weight engine fuel system controls essentially constant larger model will have lighter wing loading should able fly slower slight reduction high speed now compensated improved low speed performance larger models easier handle low speed Some modelers taking advantage reduced emphasis brute power build dual-purpose airplanes ships will compete Class Supertigre 40 Class II Supertigre 46 weighs same has same mounting 40 Engines dissimi lar mounting holes could used just well using RC type radial engine mount changing mount along engine Speed Control Harry Higley reports good success K&B 65 cc engine using HP 61 throttle crankcase pressure Harry does use exhaust restrictor carb HP carb available through Nelson Model Products Chicago modification needed turn down base throttle will fit K&B backplate New Products mentioned new G-S Products Corp three-line handle review G-S bellcrank last year Ive chance look production ver sions both units look good Both operate very freely handle similar Sturdi-built handle some important changes G-S handle uses steel throughout instead aluminum G-S unit has 24% greater throttle movement throttle trigger posi tioned loser rear handle much comfortable probably anyone else flies hand G-S handle has much clearance around lines exit handle low throttle handle can moved up down 600 before lines contact handle framea four-fold improvement area G-S Products Corp Intl PO Box 488 LaGrande OR 97850 address 5016 Angelita Ave Dayton OH 45424 RC Scale/Atkinson continued page 77 military aircraft three-views Famous Fighters Second World War Wil ham Green printed England Coverage extensive several volumes fighters others bombers books may obtained book stores throughout country maintain aviation section Smithsonian Institution Washing ton DC excellent source mili tary aircraft pictures three-views have service public cost actual cost printing pictures and/or three-views aircraft ever produced military Smithsonian will have record cluding one-of-a-kind unusual sub jects Write Smithsonian giving name designation aircraft seeking will advise cost what information have usually takes four six weeks because have requests pic ture XP-81 column example excellent photographs rare birdonly two three built turbo-prop Note blacked out number tail nose picture taken later years WW II obtained picture Smithsonian Institution several years ago address National Air Museum Washington DC subject three-views drawings probably largest col lections scale plans kits affiliated parts such glass cowls canopies spin ners etc stocked Bob Holman Plans PO Box 741 San Bernardino CA 92402 Bob has dozens cetailed scale plans some worlds best scale build ers constantly expanding scale kit line just too men tion drop Bob line obtain complete catalog fine line scale plans kits address 734 North Sixth St Terrace Blue Springs MO 64015 QuickSilver continued page 8 nitro content atutomatically elimi nates castor oil fuel mix just will blend will need 100% synthetic oil like Klotz Ucon careful because Klotz also markets 2-cycle oil labeled Racing Oil 100% synthetic contains substantial percent age bean oil ideal applications kind fuel mix talked John Klotz about gave following identifying numbers 100% synthetic KL-200 KL-208 KL-300 labeled high performance snowmobile oil same others Use least 20% oil mix 22% preferable benefits will immediately notice 100% synthetic oil fuel clean burns top piston will stay looking brand new will never have clean out varnish formations re mainder fuel mix methanol minimum percentage 5% Dont try run nitro oil will result severe detonation get competitive engine up good great wish could give straightforward answer difference appears fit crankshaft crankcase compression ratio size cylinder bypass ports really good engine Ive seen wide bypasses Get few cylinders gether examination youll soon see difference ports Jim Chary Racing offered reworked cylinder wide deep raised ports Un90 Model Aviation CL Navy Carrier continued Langleys Model Aero Engine 1903 Robert Meyer Curator National Air & Space Museum Smithsonian Institution Illustrated orical Collectors Item $500 Cumberland Press 4926 Del Ray Avenue Bethesda Maryland 20014