CONTROL LINE SPEED DOES THAT NEW ENGINE just purchased need extended break-in running before can put model fly Should mount test stand run small tank two three minutes let cool down continue procedure until accumulate running time hour two Should start large prop keep rpm down run engine slobbering rich answer questions Most likely no, issue youths beginners will clarify statements made previous column about engine break-in much misunderstanding about necessity break-in running about length time need run engine before flying about methods accomplish job Since several factors consider cant clalm exact way Different engines need different break-in techniquesits simple Use common sense read doesnt soak right away read again great variety engines constructed different materials have different design features engines steel sleeves steel lapped pistons cast-iron sleeves cast-iron lapped pistons cast-iron sleeves aluminum pistons two rings chrome-plated brass sleeves lapped aluminum alloy pistons nickel-plated brass sleeves aluminum pistons both lapped ringed chrome-plated aluminum sleeves lapped aluminum pistons probably other combinations dont know about Some engines two-stroke some four-stroke engines have separate sleeves crankcase merely bored out fit piston some crankcase chrome-plated some piston chrome-plated concept behind engine design use materials will yield long lifetime good running characteristics reliability performance lowest cost Break-in necessity mainly determined sleeve piston material sleeve piston machined fitted whether piston lapped ringed Other factors enter too such whether crankshaft supported ball bearings just sleeve bearing what kind clearance connecting rod has crank end Through years flying building testing blowing up engines modelers have accumulated much information about engine materials design information came individuals passed around quite freely Modelers learned taper sleeves reduce drag taper pistons reduce break-in what dimensions produced maximum performance lifetime results experiments can now purchased hobby shop engines have long-life ball bearings tapered plated sleeves computer-ground contoured pistons thermal-expansion matched materials Most engines ready run buy break-in requirements have built Notice said Im amazed people read column Im going assume RC fliers Speed fliers usually dont January1995 139 Michael Pugh test-runs ST 29 Nats necessary safety gear knee pads gloves hearing protectors safety glasses Saftey equipment test run starter protects fingers ear Canadian illustrator Sam Burke builds some prettiest muffs prevent hearing loss tachometer sturdy test stand models around Scale Toots powered 21 break engines just test run fly Ill give simplified explanation go detail three examples consider have engine lapped castiron piston will likely need extended break-in running have version aluminum piston ring rings needs very little break-in before can put model fly Likewise ABC Aluminum Brass Chrome engine needs minimal running before flying engines should installed flown soon will hold peaked leaned-out needle-valve setting fly setting Start fast four-cycle setting few flights dont fancy maneuvers just let engine get used pulling airplane leans out land allow engine cool before flying again wont long before can lean engine out point just breaks between twoand four-cycle point takeoff will run just fine rest flight Heres reasoning behind statements bench-run engine its doing very little work Sure its blowing some air around turning good rpm thats doing fly model moving four- five-pound model 70 80 mph work stress strain engine parts will experience though engines useful life being applied parts being mated worn match other properly under loadunder proper flying load dont understand dont believe try simple experiment big household fans square housing running block off entire intake piece cardboard motors rpm will increase because isnt doing much work Instead shoving air through grill doing stirring some air around get same effect run model engine test bench versus flying model important thing learn rememberespecially new engineis maintain proper needle-valve setting Most models overpowered dont need maximum rpm anyway richen setting little slobbering richjust set under two-cycle point simple trick will extend life engine hundreds hours Instead using larger prop keep rpm down run smaller prop first either smaller diameter lower pitch Let engine rev up operating rpm rich cooling lubricating fuel supply Another good idea keep model off ground starting running engine dust dirt act just like grinding compound recently bought used helicopter engine worn-out engine have ever seen piston ring destroyed dust stirred up hovering low altitude four-stroke engines need break-in Yes different beasts cams gears pushrods valve lifters etc metalto-metal parts must wear its important run engine can adjust needle keep rich setting adequate lubrication sound four-stroke exhaust confusing cannot used indicator rich lean setting Always use tachometer set rpm Run engine near peak back off get fuel oil going through adequately cool lubricate Bench running also gets acquainted starting setting needle operating throttle about big Giant Scale engines need break-in Have ever heard Weed Eater chain saw being broken No just fire up go carburetor usually preset running engines usually have roller bearing cranks ringed pistons need enough break seat rings Again dont run too lean need adequate cooling oil fuel mixture too parting note Don tforget wear hearing protection near running engines sharp loud bark can quickly damage hearing youll experience high-frequency sound loss ringing ears just like us old Speed fliers Always wear safety glasses running engines flying Its tough grow new eye never stand line rotating prop ributors Continued paqe 132 Hartung Emmett Holt J Italiano William R Kellermann T L Killough R Michael Knapp Rex Knepper John L Koenreich Ernest T Kurohara Robert Langelius Hugh Leighty Phillip C Leman Eric H Loos J 0 Lund Joe R Macias Leslie F May Donald S McClave N D McDaniel Robert B McMullan William H Melvin Rodney C Metz Alfred M Miller Bruce C MolzenSheldon N Myers Terry Origer David C Parsons Paul Cole John D Pizzicara Paul R Rehm Robert W Johnson Lorenzo Schlick Joseph D Schweitzer Charles W Shade Fred Sheplavy Andrew V Spaziani Norman St Denis Robert G Streit Douglas D Taffinder Walter B Thomas Kenneth F Tillou Bruce Underwood William H Vanderbeek Henry Velez John E Venable William C Webb Lawrence E Williams Charles Winchester Ross E Woodiwiss Thomas R Hampshire Maynard L Hill Vincent M King Larry Sartor William N Miller Philip G Harter James N Caparell Ernest E Pennington Robert W Wynne Joseph Beton James W Culp Wm Pitt Hartzell Carl R Jarvis C William McCarty Lawrence E Oliver Joseph F Sowinski Wilbur 0 Absher Milton AlswagerSteven B Altig Jack R Anders Mark Anderson Norman R Anderson Arnold Angelici Arnold Angelici Francis C Baird John Barron Plenny Bates Frank W Beatty Stanley Bishop Stanley Bishop Richard Black Max F Blakely Sara L Boggs Terry N Boggs Everett D Bogle Herbert L Bone Van N Brasill Duane M Brazao W D Bright Paul M Brill Jr Warner J Caines Charles W Campbell John W Campbell John J Carrigan Donald B Chambers Sid Cherniss George H Clapp E J Comontofski David G Copeman Gary L Copp Darrell W Cummings Mike Denest Francis G Dresch Israel Dubin Peter G Dunn Norman J Elliott Louis M Escalona David R Faust Mark J Foster Thomas M Francis Yuji Fukuda Donald G Garofalow Frank J Gasperich Milo D George Jay R Gould Lylburn Greer Dennis R Gumbert John L Hackert Charles R Haltigan Clifton C Hefner Jim L Hendry Gerhard H Hentschel Thomas L Hilyard Robert L Holland John M Hopper Dean Howard William R Howe James H Hubbard Ruth L Hubbard Gerard Huber Laron R Huddleston Norman C HughesS R Intagliata James Johnson Thomas L Jordan Joseph C Warner William G Kast Edward W Keck Kenneth L Blackwell Mark 0 Kim Charles Koby Jeffrey S Kramer John F Krohn Kenneth W Kuchar Ronald E Langham Albert M Larsen Liborio Calandra Cleon E Long Robert D Long Gonzalez Luis Chris J Maikisch Maurice Marshall Leo J Martin Fred McBroom E J Mccarty William F Mercer Kazuhiro Minato Allan F Mortensen Josef Nedhal Brian D Nelson Frederick E Nevin James T Nichols William C Nord Mervin L Norton Lawrence R Odegard Wayne B Patten Mark Pergande Stephen Peribinder Howard B Perrin T Alan Peterson Joseph E Pingree E W Prohaska Patrick J Rainey John R Ranson Jack S Ray Richard G Robbins Byron 0 Robinson James H Robinson Earl M Rogers John S Romanowski Daniel E Rubschlager Sanford G Stern Arthur F Schroeder Continued page 144 140 Model Aviation 4Terry Terrenoire
Edition: Model Aviation - 1995/01
Page Numbers: 139, 140
CONTROL LINE SPEED DOES THAT NEW ENGINE just purchased need extended break-in running before can put model fly Should mount test stand run small tank two three minutes let cool down continue procedure until accumulate running time hour two Should start large prop keep rpm down run engine slobbering rich answer questions Most likely no, issue youths beginners will clarify statements made previous column about engine break-in much misunderstanding about necessity break-in running about length time need run engine before flying about methods accomplish job Since several factors consider cant clalm exact way Different engines need different break-in techniquesits simple Use common sense read doesnt soak right away read again great variety engines constructed different materials have different design features engines steel sleeves steel lapped pistons cast-iron sleeves cast-iron lapped pistons cast-iron sleeves aluminum pistons two rings chrome-plated brass sleeves lapped aluminum alloy pistons nickel-plated brass sleeves aluminum pistons both lapped ringed chrome-plated aluminum sleeves lapped aluminum pistons probably other combinations dont know about Some engines two-stroke some four-stroke engines have separate sleeves crankcase merely bored out fit piston some crankcase chrome-plated some piston chrome-plated concept behind engine design use materials will yield long lifetime good running characteristics reliability performance lowest cost Break-in necessity mainly determined sleeve piston material sleeve piston machined fitted whether piston lapped ringed Other factors enter too such whether crankshaft supported ball bearings just sleeve bearing what kind clearance connecting rod has crank end Through years flying building testing blowing up engines modelers have accumulated much information about engine materials design information came individuals passed around quite freely Modelers learned taper sleeves reduce drag taper pistons reduce break-in what dimensions produced maximum performance lifetime results experiments can now purchased hobby shop engines have long-life ball bearings tapered plated sleeves computer-ground contoured pistons thermal-expansion matched materials Most engines ready run buy break-in requirements have built Notice said Im amazed people read column Im going assume RC fliers Speed fliers usually dont January1995 139 Michael Pugh test-runs ST 29 Nats necessary safety gear knee pads gloves hearing protectors safety glasses Saftey equipment test run starter protects fingers ear Canadian illustrator Sam Burke builds some prettiest muffs prevent hearing loss tachometer sturdy test stand models around Scale Toots powered 21 break engines just test run fly Ill give simplified explanation go detail three examples consider have engine lapped castiron piston will likely need extended break-in running have version aluminum piston ring rings needs very little break-in before can put model fly Likewise ABC Aluminum Brass Chrome engine needs minimal running before flying engines should installed flown soon will hold peaked leaned-out needle-valve setting fly setting Start fast four-cycle setting few flights dont fancy maneuvers just let engine get used pulling airplane leans out land allow engine cool before flying again wont long before can lean engine out point just breaks between twoand four-cycle point takeoff will run just fine rest flight Heres reasoning behind statements bench-run engine its doing very little work Sure its blowing some air around turning good rpm thats doing fly model moving four- five-pound model 70 80 mph work stress strain engine parts will experience though engines useful life being applied parts being mated worn match other properly under loadunder proper flying load dont understand dont believe try simple experiment big household fans square housing running block off entire intake piece cardboard motors rpm will increase because isnt doing much work Instead shoving air through grill doing stirring some air around get same effect run model engine test bench versus flying model important thing learn rememberespecially new engineis maintain proper needle-valve setting Most models overpowered dont need maximum rpm anyway richen setting little slobbering richjust set under two-cycle point simple trick will extend life engine hundreds hours Instead using larger prop keep rpm down run smaller prop first either smaller diameter lower pitch Let engine rev up operating rpm rich cooling lubricating fuel supply Another good idea keep model off ground starting running engine dust dirt act just like grinding compound recently bought used helicopter engine worn-out engine have ever seen piston ring destroyed dust stirred up hovering low altitude four-stroke engines need break-in Yes different beasts cams gears pushrods valve lifters etc metalto-metal parts must wear its important run engine can adjust needle keep rich setting adequate lubrication sound four-stroke exhaust confusing cannot used indicator rich lean setting Always use tachometer set rpm Run engine near peak back off get fuel oil going through adequately cool lubricate Bench running also gets acquainted starting setting needle operating throttle about big Giant Scale engines need break-in Have ever heard Weed Eater chain saw being broken No just fire up go carburetor usually preset running engines usually have roller bearing cranks ringed pistons need enough break seat rings Again dont run too lean need adequate cooling oil fuel mixture too parting note Don tforget wear hearing protection near running engines sharp loud bark can quickly damage hearing youll experience high-frequency sound loss ringing ears just like us old Speed fliers Always wear safety glasses running engines flying Its tough grow new eye never stand line rotating prop ributors Continued paqe 132 Hartung Emmett Holt J Italiano William R Kellermann T L Killough R Michael Knapp Rex Knepper John L Koenreich Ernest T Kurohara Robert Langelius Hugh Leighty Phillip C Leman Eric H Loos J 0 Lund Joe R Macias Leslie F May Donald S McClave N D McDaniel Robert B McMullan William H Melvin Rodney C Metz Alfred M Miller Bruce C MolzenSheldon N Myers Terry Origer David C Parsons Paul Cole John D Pizzicara Paul R Rehm Robert W Johnson Lorenzo Schlick Joseph D Schweitzer Charles W Shade Fred Sheplavy Andrew V Spaziani Norman St Denis Robert G Streit Douglas D Taffinder Walter B Thomas Kenneth F Tillou Bruce Underwood William H Vanderbeek Henry Velez John E Venable William C Webb Lawrence E Williams Charles Winchester Ross E Woodiwiss Thomas R Hampshire Maynard L Hill Vincent M King Larry Sartor William N Miller Philip G Harter James N Caparell Ernest E Pennington Robert W Wynne Joseph Beton James W Culp Wm Pitt Hartzell Carl R Jarvis C William McCarty Lawrence E Oliver Joseph F Sowinski Wilbur 0 Absher Milton AlswagerSteven B Altig Jack R Anders Mark Anderson Norman R Anderson Arnold Angelici Arnold Angelici Francis C Baird John Barron Plenny Bates Frank W Beatty Stanley Bishop Stanley Bishop Richard Black Max F Blakely Sara L Boggs Terry N Boggs Everett D Bogle Herbert L Bone Van N Brasill Duane M Brazao W D Bright Paul M Brill Jr Warner J Caines Charles W Campbell John W Campbell John J Carrigan Donald B Chambers Sid Cherniss George H Clapp E J Comontofski David G Copeman Gary L Copp Darrell W Cummings Mike Denest Francis G Dresch Israel Dubin Peter G Dunn Norman J Elliott Louis M Escalona David R Faust Mark J Foster Thomas M Francis Yuji Fukuda Donald G Garofalow Frank J Gasperich Milo D George Jay R Gould Lylburn Greer Dennis R Gumbert John L Hackert Charles R Haltigan Clifton C Hefner Jim L Hendry Gerhard H Hentschel Thomas L Hilyard Robert L Holland John M Hopper Dean Howard William R Howe James H Hubbard Ruth L Hubbard Gerard Huber Laron R Huddleston Norman C HughesS R Intagliata James Johnson Thomas L Jordan Joseph C Warner William G Kast Edward W Keck Kenneth L Blackwell Mark 0 Kim Charles Koby Jeffrey S Kramer John F Krohn Kenneth W Kuchar Ronald E Langham Albert M Larsen Liborio Calandra Cleon E Long Robert D Long Gonzalez Luis Chris J Maikisch Maurice Marshall Leo J Martin Fred McBroom E J Mccarty William F Mercer Kazuhiro Minato Allan F Mortensen Josef Nedhal Brian D Nelson Frederick E Nevin James T Nichols William C Nord Mervin L Norton Lawrence R Odegard Wayne B Patten Mark Pergande Stephen Peribinder Howard B Perrin T Alan Peterson Joseph E Pingree E W Prohaska Patrick J Rainey John R Ranson Jack S Ray Richard G Robbins Byron 0 Robinson James H Robinson Earl M Rogers John S Romanowski Daniel E Rubschlager Sanford G Stern Arthur F Schroeder Continued page 144 140 Model Aviation 4Terry Terrenoire