BETTER Racing performance K&B 65cc racing engine As contest season winds down Midwest area receive re quests concerning improving performance various Racing engines Some modifications can done expensive tools will result rather substantial improvements engine per formance After several hours spent testing various propel lers exhaust pipe lengths utilized little tip given Bob Kerr carefully removing excess meat exhaust extractor K&B 65 200-400 rpm increase forthcoming observing exhaust port exhaust stack saw excess metal Thinning walls bolted-on exhaust manifold definitely im proves performance photos shows Bob holding two 65 engines right has thor oughly opened polished interior exhaust has relieved addition find cutting off approximately ight pipe gives steadier needle setting lower rpm also increases rpm about 200 top end can prove yourself merely cutting approximately % K&B straight pipe trying engine maxi mum rpm standard pipe shortened addition have found opening up intake venturi approximately 010 improves performance Bob Kerr also has shown needle valve fix ture makes square metal block very neatly directs fuel line toward tank usual problems fuel line pinching being curved regular nee dle valve body around toward tank Bob also utilizes check valve can mounted tubing going pressure fitting addition 65 very sensitive shaftto-bearing fit Removing front crankcase housing heating uniformly rotating shaft means scrap propeller mounted normal manner will align bearings minimum friction encountered crankshaft area have also found lapping rear rotor disc backplate improves performance disc must also set backplate proper clearance less 003 Frankly biggest performance edge ob tained properly fitting piston liner preferred setup ABC AAC taper 002 0035 between top exhaust port top piston travel engine may first seem extremely tight af ter couple runs heat builds up will restart easily develop maximum power piston/liner fit carefully maintained Irvine 15 New engine entry Scale Rac ing colleagues Combat circle some favorable comments concerning Ir vine 15 produced England After observing some extremely stout runs FAI Combat air craft think engine may have some merit Racing applications purchased hobby shop England took approxi mately 10 days arrive US Mine Combat version has rear exhaust fairly standard timing am enclosing photo graph close look will indicate passing similarity Rossi 15 Internally engine has excellent hardened crankshaft intake port closing 62 0 should make excellent performance hole crankshaft needs opened up 035 Bob Kerr tweaks K&B 65cc engInes Racing two photo left reveal right-hand ones exhaust extension has relieved smoother gas flow venturi has moved operation engine inverted has opened up 010 polished Photo right shows Bobs custom-made right-angle fuel-feed block needle valve eliminates tendency fuel line kink bent back standard necdie valve body Note check valve has installed crankcase pressure line polished piston-to-liner fit received quite satisfactory restarting used standard heads Rossi 15 fit bore head clamp satisfactorily bearing fit tolerances engine quite acceptable problem found was lot casting mold residue left inside bypass boost ports removed material metal would surely have found its way piston liner ruined fine unit After honing refitting liner slightly found performance approximately 1500 rpm down best Rossi using same propeller After modifying intake tim ing slightly performance increased about 600 rpm down best Rossi Certainly relatively inexpensive en gine am sure will other members Racing fraternity after some work will find engine satisfactory power plant Scale Racing Continued page 172 62 Model Aviation Control Line Racing John Ballard 10102 Klmbkwlck Dr Louisville KY 40223 Pitman Fluker/Lee Racing team Bill Lee uses leather glove cinch-strap wrist help hold glove place Right hand flips prop also catches model lands needs plenty protection Soft leather pitmans glove has outlived its usefulness Prop-flipping fingertips wear rapidly necessitating frequent replacement new Irvine 15 England bears exter nal resemblance Rossi 15 Prop shown carbon-fiber 5% x 5/ Ballards initial evaluation engine showed favor able performance Racing Time will tell THERMAL CHARGER what looking electric sailplane good looks easy build fun fly great performance Thermal Charger Wing Span Wing Area Motor Included 60 Inches 545 Sq Inches Leisure 05 Electric %fl PRECISION PRODUCTS INC 714 592-5144 510 E Arrow Highway San Dimas CA 91773 Junior Senior champs need compete headto-head against Open champion would no longer exist possibility quite controversial fliers feel such format would effectively ex clude Juniors Seniors future par ticipation Walker Cup flyoff may prove case evi dence past argues against Names like Werwage Cipra Adamisin proof posi tive excellence rises top regardless age Besides flip side coin un der skill class format entirely possible five top Expert class fliers could Jun iors Seniors would us old duffers standing sidelines CL Racing/Ballard Continued page 62 Pitmans finger protection have asked several occasions recommend best type glove pitman use Over years have found all-leather glove absolutely best gloves use fiber body leather trim just too stiff good flexible fin ger movement Remember pitmans right hand generally used adjust needle valve open fuel shutoffs require good smooth finger movement flip propwhich man dates protection kickback Racing engine addition people like glove can cinched up wrist photos shows well-used leather glove discarded after Racing campaigns As can see flip-finger has fi nally become cut mangled no longer fers protection pitmans digit cinching glove up near wrist glove held sta tionary hand reduces slippage grabbing aircraft landing glove actu ally acts damping unit pitman catches airplane either prop nut wing leather glove much slipresistant grabbing Racer covered oil during fast pit stop pitmen prefer gloves have no lining flexible yet have dense leather through out fingers palm Half-A Mouse Racing spent portion spring summer working Cox 049 en gines After receiving several tips fellow Mouse Racing enthusiasts found great deal problem involved varnish building up piston bore liner 1988 1 50 seconds shy qualifying final race whereas 1989 finished fi nals Open Mouse four seconds off winners time used exactly same airplanes engines except year started using 0000 steel wool wooden dowel rod re move varnish cylinder 25-30 runs past would experience acceptable per formance several minutes find engine performance would deteriorate run ning slowly poor starting charac teristics would almost impossible find proper needle valve setting found cleaning varnish cylinder restored origi nal performance movement needle valve nearly critical able work propeller combinations improve airspeed certainly cannot emphasize enough varnish-bedeviled cylinder must cleaned regular basis consistent performance ob tamed little engines As always solicit photos comments CL Combat/Johnson Continued page 63 fuel fuel wed using brand-new gallon produced well-known commercial maker After switch everything back normal manufacturer heard about misfortunes got contact sent case sorted fuels having various nitro contents us test never able duplicate prob lems previously encountered fuel ran perfectly have developed some new theories probable causes troubles Most com mercial fuels contain additive packages pre vent foaming hard tanks tanks detergents keep engine clean something keep residue rusting innards en gine well things improve film strength lubricant etc additives may wonders power cleanliness longevity thought maybe attacked bladder material residue attack clogging needle valves thereby making overly lean settings Because high pressure produced bladders have run needle valves al closed off get right mixture typical Supertigre needle 35 might set -3A turn out fully seated position suctionfed engine same type might require nee dle set three four full turns out What means needle valve assemblies eatI U I11 reds cowls kits plans Strong lightweight one-piece constwction Exact duplicates manufacturers original Also radial cowls wheelpants SendSl lJOfora-pg brochure Orcall 703-890-60179 am-9 pm EDT phone orders information FIBERGLASS MDePtMARIlBOXS3O Goodview VA 24095 172 Model Aviation hL W202 1/4 SCALE GLIDER KIT Premium Quality Kit European Quality American Technology Piece Gel-coated Fuselage Pre-Manufactured Wings w/Carbon Fiber Spars Obechi sheeting • Slope Thermal 000 plus $25 Shipping 1/4 & 1/5 Scale Glider Retracts Precision Machined Aerospace Specs Made 6061 T6 Aluminum 650 plus $5 Shipping & Handling 5 Feat Long 1/16 Misic Wire Pushrods Nylon Outer Casing 63 ma plus $3 Shipping SCALE GLIDER COMPONENTS 7024 Fm PH. CarImbid 0* 92009 6193 921-1439 CA Residents add 7% Send stamped ennelope info
Edition: Model Aviation - 1990/01
Page Numbers: 62, 172
BETTER Racing performance K&B 65cc racing engine As contest season winds down Midwest area receive re quests concerning improving performance various Racing engines Some modifications can done expensive tools will result rather substantial improvements engine per formance After several hours spent testing various propel lers exhaust pipe lengths utilized little tip given Bob Kerr carefully removing excess meat exhaust extractor K&B 65 200-400 rpm increase forthcoming observing exhaust port exhaust stack saw excess metal Thinning walls bolted-on exhaust manifold definitely im proves performance photos shows Bob holding two 65 engines right has thor oughly opened polished interior exhaust has relieved addition find cutting off approximately ight pipe gives steadier needle setting lower rpm also increases rpm about 200 top end can prove yourself merely cutting approximately % K&B straight pipe trying engine maxi mum rpm standard pipe shortened addition have found opening up intake venturi approximately 010 improves performance Bob Kerr also has shown needle valve fix ture makes square metal block very neatly directs fuel line toward tank usual problems fuel line pinching being curved regular nee dle valve body around toward tank Bob also utilizes check valve can mounted tubing going pressure fitting addition 65 very sensitive shaftto-bearing fit Removing front crankcase housing heating uniformly rotating shaft means scrap propeller mounted normal manner will align bearings minimum friction encountered crankshaft area have also found lapping rear rotor disc backplate improves performance disc must also set backplate proper clearance less 003 Frankly biggest performance edge ob tained properly fitting piston liner preferred setup ABC AAC taper 002 0035 between top exhaust port top piston travel engine may first seem extremely tight af ter couple runs heat builds up will restart easily develop maximum power piston/liner fit carefully maintained Irvine 15 New engine entry Scale Rac ing colleagues Combat circle some favorable comments concerning Ir vine 15 produced England After observing some extremely stout runs FAI Combat air craft think engine may have some merit Racing applications purchased hobby shop England took approxi mately 10 days arrive US Mine Combat version has rear exhaust fairly standard timing am enclosing photo graph close look will indicate passing similarity Rossi 15 Internally engine has excellent hardened crankshaft intake port closing 62 0 should make excellent performance hole crankshaft needs opened up 035 Bob Kerr tweaks K&B 65cc engInes Racing two photo left reveal right-hand ones exhaust extension has relieved smoother gas flow venturi has moved operation engine inverted has opened up 010 polished Photo right shows Bobs custom-made right-angle fuel-feed block needle valve eliminates tendency fuel line kink bent back standard necdie valve body Note check valve has installed crankcase pressure line polished piston-to-liner fit received quite satisfactory restarting used standard heads Rossi 15 fit bore head clamp satisfactorily bearing fit tolerances engine quite acceptable problem found was lot casting mold residue left inside bypass boost ports removed material metal would surely have found its way piston liner ruined fine unit After honing refitting liner slightly found performance approximately 1500 rpm down best Rossi using same propeller After modifying intake tim ing slightly performance increased about 600 rpm down best Rossi Certainly relatively inexpensive en gine am sure will other members Racing fraternity after some work will find engine satisfactory power plant Scale Racing Continued page 172 62 Model Aviation Control Line Racing John Ballard 10102 Klmbkwlck Dr Louisville KY 40223 Pitman Fluker/Lee Racing team Bill Lee uses leather glove cinch-strap wrist help hold glove place Right hand flips prop also catches model lands needs plenty protection Soft leather pitmans glove has outlived its usefulness Prop-flipping fingertips wear rapidly necessitating frequent replacement new Irvine 15 England bears exter nal resemblance Rossi 15 Prop shown carbon-fiber 5% x 5/ Ballards initial evaluation engine showed favor able performance Racing Time will tell THERMAL CHARGER what looking electric sailplane good looks easy build fun fly great performance Thermal Charger Wing Span Wing Area Motor Included 60 Inches 545 Sq Inches Leisure 05 Electric %fl PRECISION PRODUCTS INC 714 592-5144 510 E Arrow Highway San Dimas CA 91773 Junior Senior champs need compete headto-head against Open champion would no longer exist possibility quite controversial fliers feel such format would effectively ex clude Juniors Seniors future par ticipation Walker Cup flyoff may prove case evi dence past argues against Names like Werwage Cipra Adamisin proof posi tive excellence rises top regardless age Besides flip side coin un der skill class format entirely possible five top Expert class fliers could Jun iors Seniors would us old duffers standing sidelines CL Racing/Ballard Continued page 62 Pitmans finger protection have asked several occasions recommend best type glove pitman use Over years have found all-leather glove absolutely best gloves use fiber body leather trim just too stiff good flexible fin ger movement Remember pitmans right hand generally used adjust needle valve open fuel shutoffs require good smooth finger movement flip propwhich man dates protection kickback Racing engine addition people like glove can cinched up wrist photos shows well-used leather glove discarded after Racing campaigns As can see flip-finger has fi nally become cut mangled no longer fers protection pitmans digit cinching glove up near wrist glove held sta tionary hand reduces slippage grabbing aircraft landing glove actu ally acts damping unit pitman catches airplane either prop nut wing leather glove much slipresistant grabbing Racer covered oil during fast pit stop pitmen prefer gloves have no lining flexible yet have dense leather through out fingers palm Half-A Mouse Racing spent portion spring summer working Cox 049 en gines After receiving several tips fellow Mouse Racing enthusiasts found great deal problem involved varnish building up piston bore liner 1988 1 50 seconds shy qualifying final race whereas 1989 finished fi nals Open Mouse four seconds off winners time used exactly same airplanes engines except year started using 0000 steel wool wooden dowel rod re move varnish cylinder 25-30 runs past would experience acceptable per formance several minutes find engine performance would deteriorate run ning slowly poor starting charac teristics would almost impossible find proper needle valve setting found cleaning varnish cylinder restored origi nal performance movement needle valve nearly critical able work propeller combinations improve airspeed certainly cannot emphasize enough varnish-bedeviled cylinder must cleaned regular basis consistent performance ob tamed little engines As always solicit photos comments CL Combat/Johnson Continued page 63 fuel fuel wed using brand-new gallon produced well-known commercial maker After switch everything back normal manufacturer heard about misfortunes got contact sent case sorted fuels having various nitro contents us test never able duplicate prob lems previously encountered fuel ran perfectly have developed some new theories probable causes troubles Most com mercial fuels contain additive packages pre vent foaming hard tanks tanks detergents keep engine clean something keep residue rusting innards en gine well things improve film strength lubricant etc additives may wonders power cleanliness longevity thought maybe attacked bladder material residue attack clogging needle valves thereby making overly lean settings Because high pressure produced bladders have run needle valves al closed off get right mixture typical Supertigre needle 35 might set -3A turn out fully seated position suctionfed engine same type might require nee dle set three four full turns out What means needle valve assemblies eatI U I11 reds cowls kits plans Strong lightweight one-piece constwction Exact duplicates manufacturers original Also radial cowls wheelpants SendSl lJOfora-pg brochure Orcall 703-890-60179 am-9 pm EDT phone orders information FIBERGLASS MDePtMARIlBOXS3O Goodview VA 24095 172 Model Aviation hL W202 1/4 SCALE GLIDER KIT Premium Quality Kit European Quality American Technology Piece Gel-coated Fuselage Pre-Manufactured Wings w/Carbon Fiber Spars Obechi sheeting • Slope Thermal 000 plus $25 Shipping 1/4 & 1/5 Scale Glider Retracts Precision Machined Aerospace Specs Made 6061 T6 Aluminum 650 plus $5 Shipping & Handling 5 Feat Long 1/16 Misic Wire Pushrods Nylon Outer Casing 63 ma plus $3 Shipping SCALE GLIDER COMPONENTS 7024 Fm PH. CarImbid 0* 92009 6193 921-1439 CA Residents add 7% Send stamped ennelope info