CONTROL LINE SPEED THIS IS THE CONTROL Line Speed column however find its read modelers fly other Control Line events well RC fliers As result try pass engine-related information accumulate John Bishop member suburban-Chicago Tn-Village RICers club wanted pass along some information about big SuperTigre 2500 3000 engines Quite few fliers have complained about excessive vibration engines John accidentally figured out cause flier noticed spinner backplate prop driver plate comes engine out balance drilled several holes heavy side rectify problem Someone saw wondered original plate out balance finally figured out designed way Youre supposed orient backplate crankshaft heavy side opposite crankshaft counterbalance correct problem first put plate itself prop balancer mark heavy side put plate back engine make sure mark lines up crankpin mark should straight down piston bottom dead center straight up top dead center Incidentally John says isnt information engine instructions about youre skeptical test procedure Clamp end 18-inch piece smalldiameter music wire side fuselage sticks straight up Note wire vibrates run engine plate different positions Neville Palmer Palisades NY has constructed several own engines wrote ask what thought about nickelplated sleeves didnt want problems setting up chrome-plating system Some OS engines have ABN sleeveand-piston combination piston high-silicon aluminum alloy brass sleeve nickel-plated nickel electroplated like chrome applied electroless process clean brass dipped solution nickel ions attach themselves brassno electric current necessary Electroplated nickel used plating situations maximum adherence desired times nickel flash used under copper chrome plating Car bumpers example nickel has extremely active surface what makes unsuitable parts will rub against another metal will gall have high friction may weld itself other part Electroless nickel plating however has different crystal structure can used metals rub doesnt have much peel strength electroplated metal just doesnt stick brass well years ago wrote engine article predicted use electroless nickel plating brass sleeves experimenting plating solutions boron additive nickel supposed reduce friction improve wear characteristics dont know OS plating has boron Several Speed fliers have tried use ABN OS 65 engines D Speed Ive seen few fail nickel flaked peeled off Its opinion failures result piston velocity Thirty years ago before ABC Dick Hall experimenting different sleeve-and-piston alloy plating combinations Dick avid modeler rocket engineer Huntsville Arsenal Hes acute thinker endless tinkerer person told SuperTigre about high-silicon aluminum alloy material use engines tried kinds thingssleeves made steel cast-iron copper brass plated chrome gold silver Pistons made out cast-iron 118 Model Aviation Howard photo shows late Mike Hoyt r son Bill 1961 Nats Mikes Sidewinder design helped revitalize Jet Speed Gene Howard Albany NY sent photo asymmetrical Gene Howards copy Ello Zanins record-breaking 203-mph jet Gene jet-model flier area jet Genes version destroyed before flew alloyed cast-iron mild steel 4340 steel also plated chrome gold silver Chrome against silver best combinations metal surface compatibility Dick some excellent engines silver-plated steel sleeve chrome-plated cast-iron piston took incredible amount running break Aluminum doesnt run well against anything chrome tried gold-plated sleeves pistons running against chrome didnt perform well silver buy stainless-steel hydraulic fittings today youll find threads silverplated prevent galling against mating part piston sleeve materials have thermally-matched Cast-iron pistons will work steel sleeve instance because cast iron has lower coefficient thermal expansion read somewhere years ago Dooling brothers experimental engine would rev up 30000 rpm seizethe parts didnt have proper thermal expansion Bill Wisniewski tried titanium piston would start seize up immediately thermal expansion titanium about same cast iron its thermal conductivity low combustion heat couldnt escape fast enough piston would swell stick However time flipped prop again would have cooled fit properly Some engines ran very well combination seemed have definite upper-rpm limit flywheel instead propeller came up theory certain alloy piston will operate against its sleeve alloy up maximum rubbing velocity Go higher get galling flaking welding just refusal go faster course other factors limit rpm Engine design porting timing help ABC combination gave biggest jump performance lighter aluminum piston allows higher rpm theres no drag friction rings thermal expansion piston almost perfectly matched sleeve believe same velocity effect what limited Cox enginesthe steel sleeve wouldnt allow rev high rpm neighbor Bob Oge does chrome plating Hes revved Tee Dee 049 engines 30000 rpm after chroming reworking parts cant stand stress long however Its opinion ABN engines work long keep rpm down Try Speed other high-rpm events youll have trouble piston fit has effect toobut need tight fit higher power Some just strip nickel chrome plate eliminating problem Whats next Great Leap Forward Ill tell future column pionships Purchase team patch pin red white blue yellow shown above $500 both $900 Make checks payable Ronald Schorr FAI Account 5224 Teesdale Avenue North Hollywood CA 91670 Include stamped self-addressed envelope F30 September1995 119 P lea5e Help support United States America its effort win 1995 F3D Pylon World Pylovi World Campicrn5Iip5 Aulqul5t 12- 16
Edition: Model Aviation - 1995/09
Page Numbers: 118, 119
CONTROL LINE SPEED THIS IS THE CONTROL Line Speed column however find its read modelers fly other Control Line events well RC fliers As result try pass engine-related information accumulate John Bishop member suburban-Chicago Tn-Village RICers club wanted pass along some information about big SuperTigre 2500 3000 engines Quite few fliers have complained about excessive vibration engines John accidentally figured out cause flier noticed spinner backplate prop driver plate comes engine out balance drilled several holes heavy side rectify problem Someone saw wondered original plate out balance finally figured out designed way Youre supposed orient backplate crankshaft heavy side opposite crankshaft counterbalance correct problem first put plate itself prop balancer mark heavy side put plate back engine make sure mark lines up crankpin mark should straight down piston bottom dead center straight up top dead center Incidentally John says isnt information engine instructions about youre skeptical test procedure Clamp end 18-inch piece smalldiameter music wire side fuselage sticks straight up Note wire vibrates run engine plate different positions Neville Palmer Palisades NY has constructed several own engines wrote ask what thought about nickelplated sleeves didnt want problems setting up chrome-plating system Some OS engines have ABN sleeveand-piston combination piston high-silicon aluminum alloy brass sleeve nickel-plated nickel electroplated like chrome applied electroless process clean brass dipped solution nickel ions attach themselves brassno electric current necessary Electroplated nickel used plating situations maximum adherence desired times nickel flash used under copper chrome plating Car bumpers example nickel has extremely active surface what makes unsuitable parts will rub against another metal will gall have high friction may weld itself other part Electroless nickel plating however has different crystal structure can used metals rub doesnt have much peel strength electroplated metal just doesnt stick brass well years ago wrote engine article predicted use electroless nickel plating brass sleeves experimenting plating solutions boron additive nickel supposed reduce friction improve wear characteristics dont know OS plating has boron Several Speed fliers have tried use ABN OS 65 engines D Speed Ive seen few fail nickel flaked peeled off Its opinion failures result piston velocity Thirty years ago before ABC Dick Hall experimenting different sleeve-and-piston alloy plating combinations Dick avid modeler rocket engineer Huntsville Arsenal Hes acute thinker endless tinkerer person told SuperTigre about high-silicon aluminum alloy material use engines tried kinds thingssleeves made steel cast-iron copper brass plated chrome gold silver Pistons made out cast-iron 118 Model Aviation Howard photo shows late Mike Hoyt r son Bill 1961 Nats Mikes Sidewinder design helped revitalize Jet Speed Gene Howard Albany NY sent photo asymmetrical Gene Howards copy Ello Zanins record-breaking 203-mph jet Gene jet-model flier area jet Genes version destroyed before flew alloyed cast-iron mild steel 4340 steel also plated chrome gold silver Chrome against silver best combinations metal surface compatibility Dick some excellent engines silver-plated steel sleeve chrome-plated cast-iron piston took incredible amount running break Aluminum doesnt run well against anything chrome tried gold-plated sleeves pistons running against chrome didnt perform well silver buy stainless-steel hydraulic fittings today youll find threads silverplated prevent galling against mating part piston sleeve materials have thermally-matched Cast-iron pistons will work steel sleeve instance because cast iron has lower coefficient thermal expansion read somewhere years ago Dooling brothers experimental engine would rev up 30000 rpm seizethe parts didnt have proper thermal expansion Bill Wisniewski tried titanium piston would start seize up immediately thermal expansion titanium about same cast iron its thermal conductivity low combustion heat couldnt escape fast enough piston would swell stick However time flipped prop again would have cooled fit properly Some engines ran very well combination seemed have definite upper-rpm limit flywheel instead propeller came up theory certain alloy piston will operate against its sleeve alloy up maximum rubbing velocity Go higher get galling flaking welding just refusal go faster course other factors limit rpm Engine design porting timing help ABC combination gave biggest jump performance lighter aluminum piston allows higher rpm theres no drag friction rings thermal expansion piston almost perfectly matched sleeve believe same velocity effect what limited Cox enginesthe steel sleeve wouldnt allow rev high rpm neighbor Bob Oge does chrome plating Hes revved Tee Dee 049 engines 30000 rpm after chroming reworking parts cant stand stress long however Its opinion ABN engines work long keep rpm down Try Speed other high-rpm events youll have trouble piston fit has effect toobut need tight fit higher power Some just strip nickel chrome plate eliminating problem Whats next Great Leap Forward Ill tell future column pionships Purchase team patch pin red white blue yellow shown above $500 both $900 Make checks payable Ronald Schorr FAI Account 5224 Teesdale Avenue North Hollywood CA 91670 Include stamped self-addressed envelope F30 September1995 119 P lea5e Help support United States America its effort win 1995 F3D Pylon World Pylovi World Campicrn5Iip5 Aulqul5t 12- 16