CONTROL LINE SPEED HAVE YOU PURCHASED new engine latelymaybe newer ABC lapped piston types Did take out box put prop us flip just test feel amazed perhaps free loose flipped itexcept top stroke popped over neatly cleanly Did read instructions find out manufacturer recommendations breakin running needle setting start prop sizes fuel Does need prolonged break-in running lot break-in procedure misinformation around could probably write entire column about Maybe willsometime Until follow instructions come engine manufacturers arent going tell anything might affect warranties perfonnance Necessary break-in procedures vary engine engine according design size materials manufacture time required can range couple minutes ABC engines hour other engines Getting back great-feeling new powerhouse just bought did wonder feels nice design fits materials come Ill try explain some Speed secrets Such looseness freedom movement ABC high-performance engines mostly result taperedor so-called choke-bored cylinder linerwhere bore diameter perhaps much 005 larger bottom stroke top piston must seal ignition top 1/ inch piston also tapers slightly match sleeve combination greatiy reduces piston drag resulting rpm increased reliability better idling RC engines extended lifetime Such engines need almost no break-in running just bolt model go fly time start engine set needle check throttle rev up couple times ready go Just dont start bigger prop recommended dont run engine slobbering rich Start smaller prop run fastnot leanjust knock fuzz off metal parts So first turkey would abuse engine like would grind lap hone sleeve such radical looseness would have thought letting piston flop around nice chrome-plated sleeve Back old days used go extreme methods get sleeve straight round could run engines hours little props break until would run high nitro fuel like give credit major engine design advancements credit due let tell little story Quite few years ago probably close 20 flying Speed contest St Louis Missouri quite few entrants Formula 40 popular events running K&B 65 ABC engines ran pretty well regularly beat SuperTigres other engines talking friend Tom Blankman Speed flier St Louis told want 40s go have loosen up Just taper bore squeaky tight top 005 clearance bottom make sure have about 002 clearance diameter area near bypass exhaust ports Tom flying Pylon Charlie Brunner tapered sleeves Charlies SuperTigre 40s pretty well wiped out competition got home made brass lap followed Toms directions using 900-grit aluminum oxide lapping compound oil cut chrome plating carefully checked measurements telescoping gauge micrometer faithfully tried 002 inch near ports 005 inch bottom much lapping usually went through chrome exposing brass near bottom sleeve didnt seem make difference went next contest speeds jumped about 10mph won lot contests set some Formula 40 records setup other contestants just couldnt figure out engines ran well Tom Charlie guys came up such radical dimensions racing engines Some manufacturers slight tapers few tenths thousandths some would relieve sleeve beneath exhaust port Nobody thought engines would run loose Tom set up According some information have read Mel Anderson apparently used some choke-bore free flight engines early 1932 some WW II P-Si engines choke-bored cylinders first SuperTigre ABC engines came very liffle taper easily hopped up Toms treatment told George Aldrich about lapping treatment told Teny Prather soon hopping up engines other Pylon fliers Speeds immediately jumped dramatically told Bill Wisniewski about 005 taper years Nats saw him again next Nats asked Does 005 taper work said 015 inch better Thats way Bill thinks hears something new tries expands improves Now buy new engines come improvements start May1994 123 Dan Lutzs Stanzel Tiger Shark has UControl instead G-Line Text has details Ohisson 60-powered model Tom Blankman left fires up 21 Sport Speed model flying buddy Bob Franklin holds Indianapolis Ned Morris holds lightweight mostly balsa Formula 40 recently flew 154 mph Bill Wisniewski proud grandson Mike holding Bills world-famous Class B Pink Lady model last years Nats A~ 1OthANNUAL MARC SHOW FOR IFORMATION CONTACT Show Diredors RON STAHL 4521 BelMeu Ave Baltimore MD 21215 410-664-2712 DAVE MITCHELL 410-668-6690 * NOW FULLY AJR-CONDrnONEDI * MID ATLANTIC RADIO CONTROL JUNE4AND5 1994 Satuiday9 am 5 pm Sunday 10 am 4 pm MARYLAND STATE FAR GROUNDS TiMONIUM MARYLAND Sponsored MRP5D mu. muVh INC TO YORK 45 YORK RD EXIT 17 ETO WLJJINGTON PADOMA RD IlUONIUM FAIR TO FREDRICKGROUNDS TIMONIUld RD95 70695 40695 3ALTJMRZ 95WASH PKWY TO WASHINGTONNORTh 4 Over 100 Manufadurers Static Days Swapshop Radio Kit & Equipment Raffle Door Prizes Free Parking for5000 Cars Refreshment Centers Indoor & Outdoor Demonstrations Fadory Teams Ahvraft-Cars-Boats Radios-Engines Transmitter Testing 9000 Gallon Outdoor Boat Pond AS ALWAYS SELUNG SHOW still believe ABC engines need extended break-in should stop think high-silicon piston alloys have coefficient expansion less brass sleeve soon heat gets onto sleeve expands piston clearance increased best fastest running engines ever tight cold could turn over slowly flip hard generate little friction heat tighter engines sealed better hot running got power time trouble engine set just little lean 80% nitro fuel inadequate piston cooling maximum power burned hole piston pistons never burned scuffed sleeves just ended up hole near center next time flip ABC engines think Tom Charlie mentally thank contribution engine performance lifetime operation Dan Lutz Fallbrook California sent photo Victor Stanzel Tiger Shark after reading January column powered Ohlsson 60 ignition engine built Ucontrol rather original G-Line has Super V Shark red white paint scheme grandson Stanzel brothers sent Dan original G-Line decal top fuselage dated 1946 TUNCL~ F Mow - E-WOLaTME-Ti IT 1531714 41$ FLN- - 4 FF Old TimerslBaker Continued page 117 version 90% reduction original enlarging copier should able get back has things catalog cant cover have mention though has several small models models like John Tatone s PAl Power model scaled C02 J L Sadlers 1940 Pacemaker low-wing model series small Old-Timers minielectric C02 range 19 21 inches span sold plans printwood $6 plus postage 20% total $720 each. can make deal three $20 includes Interceptor Kerswap Rocketeer recent additions series same price three Sanduster 124 Model Aviation SHOP $20 Per Day Indudes Admission NO DEALERS PLEASE Umi 2 tables per person -SWAP SHOP ONLYFor Pre-Registration call Vernon Davies 41 0-823-4562
