Cliupp ne Gas engines models Twen ties big heavy home made Pioneers such Carl B Chupp per severed pro duced splendid example its day IN THE AUGUST 1981 issue Model via tion presented Chupp seven-foot Little Bitty biplane built late 1 920s under title Big Birds Long Ago brief mention engine used power model made spite some research could beg borrow heaven forbid steal copy April 1930 issue Aero Digest sup posed have featured engine knowing model builders gentle man Washington State wrote mentioned copy might found didnt take long secure Xerox copy article Dick Seely Aero Literature PO Box 1441 Olym pia WA 98507 After examining material looked engine might interest some MAs readers first used power mini ature aircraft What about engine Aero Digest article K E Dowd provided following information plus lesson two- four-cycle engines ended quiz article engine plane designed con structed Mr Carl B Chupp factory manager old Pitcaim Aircraft Corp Willow Grove PA cylinders made solid bar 3% nickel steel stock no cooling fins wall thickness cylinders 1/32 liberal shoulder provided base cylinder fit against crankcase Pistons machined aluminum bar fitted two cast iron piston rings Apparently great number rings made before correct fit obtained Connecting rods machined solid steel bar fitted babbitt bearings double-throw crankshaft machined solid bar ran ball bearings crankcase milled turned solid aluminum stock large breather vent provided top crankcase permit easy lubrication Lubrication splash system proved satisfactory Cast iron cylinder heads used pro vided valve seats-for 5/I 6-in diameter valve heads made tungsten steel valve stems -in diameter Valve opening about 3/32-in Neat little pushrods actuate valves through small rocker arms 21 gears housed back engine camshaft used operate valves 5/64-in lift ignition system operated six-volt battery regular automotive storage battery remember six-volt back could used bench-testing engine flight purposes battery made up four D-size flashlight battery cells spark coil taken Dixie magneto maybe some real old-timers know about Dixie no modifications made Hard rubber used make distributor Contact points platinum enclosed breaker box Carbon brushes fitted Continued page 156 CHUPP LITTLE BITTY ENGINE TWO CYLINDER HORIZONTAL OPPOSED BORE STROKE CYLINDER CYLINDER HEAD SCALE IN INCHES II 0I2345B BREATHER CAMSHAFTVALVE PUSH ROD SPARKPLUG VALVE ROCKER VALVE VALVE SPRING INTAKE MANIFOLD FROM AERO DIGEST APRIL/1930 GEAR HOUSING r -CARBURETOR FLOAT STEM CARBURETOR BOWL CARBURETOR AIR INTAKE GAS LINE TO TANK NEEDLE VALVE DISTRIBUTOR INTERRUPTER BREAKER POINTS WEIGHT SCHEDULE ENGINE B CARBURETOR2Boz PROPELLER--B GASTANKBPIPE -____ 3 COIL__ __ ID BATTERY45 GASOLINE---— 2 TOTAL 53Soz August1982 83 No 375 Snapshot Twin$1100 RC Workhorse utility sport flier twin 35-40 engines 4-5 channel Foam wings lift up 12 lb Two sheets No 376 Auroroa$350 RC Sport/aerobatic flier 049-1 0 power uses 2-ch rudder/elevator 3-ch elevator/aileron/throttle No 377 Wingmaster$200 CL AA sport-stunter Profile fuselage sheet wing w/flaps No 131Gee Bee Model Y 40-powered RC stand-off scale great old-rime racers$500 No 169Simitar RCA spectacular flying wing 15 nose- moanted tractor$300 No 225Ole Reliable RC 70 version 38 old-timer REM controls 15-$425 No 239Sloe Birds RC Ken Willards formation plane 4-ch. 10$375 No 253Mitchell 5-25 RC 4-ft /aA twin Ace foam pannls WeII-behannd$350 No 259Chambermaid FF Bill Hesss soperlatise rsbbnr-powred scale winner.........$200 No 260Waco Custom CabinRC Don Srslis scalnr 1 5-20 REM controls$400 No 262Crashmaster CL Crash-proof trainer 2 siznst 5-30 35-40$125 No 291Cap 20 40-pownred scaln RC Frnnch aerobatic plane Low wing tail dragger 2 sheets No 295Geeflee Sr Sportster RC -scale Haffke 91 power Prototype spas 30 ft 214 sheets$11 75 No 302Mini F-iS RC Sarpolas 049 docted fan sport flier 2-oh Balsa wings tail fese stractare$275 No 307Pegasus RC Watsons giant soper sailplane featores flaps spoilers T-tail 166 wingspan$675 No 3101930 Fleet Biplane RC Sport Scale 35-40 4-ch Wingspan 56 1/6 scale Two sheets$625 No 314Drake II RC Ken Willards flying host 3-oh. 15-power Fly land removable gear$375 No 317Schweizer T63-A RC Sport Scale Sailplane Jack Hiner nan 11-ft span 3-oh Two sheets$1200 No 323Super voodoo CL Fast Combat John J0 featores built-op wing fast constraction wins1 $300 No 325Commodore RC Tesaco-class Old-Timer Onlan updates Shereshaws classic 3-oh for29-power 2sh $1000 No 326Taylor Cob RC Don Srslis Schoolyard-Scale 049s 2-3 oh Speos SO in$350 No 326BriseolScoutD RClltznchs Precision-Scale-sizespan73 bipefor91 power4 sheets$1650 No 332Zephyr RC Small 2-oh glider hand- laanch tow thermal slope soaring$200 No 335Sopwith Dolphin FF Bill Noonans Jsmbo-Rabber scale great WW I-vintage biplane$175 No 337Super Akin-i Chips RC Scale-like stunter S-ch 1 smoke salve 40-power 2 sheets$700 No 339Rearwio Jr RC Dos Mathews Sport Scale 4-ch 40-power Monoplane$525 No 340Mossie Stunter CL Twin 35-powered semi-scale based famous WW II Mosqaito bomber$400 No 341Brown 6-2 RC Scale-like sport flier 4-oh 19-29-power Race Qoickee hot 25$500 No 343Wasp vI FF Mike Stops Nats-winning Outdoor HLO$100 No 345La Jolita CL /oA Scale Racer Class also sport Moose$100 No 347Space Shuttle RC Sport-Scale glider 2-oh lasoch mother plane$1 75 No 349Onestep RC Trainer has very forgiving flying qualities 3-oh. 1 0-25 power$425 No 350Electric Spitfire RC Fun-Scale 15/25 electric 20-30 glow 3-oh spans 6 ft$750 No 353Sanitation CL Sleek 46-powered super- Saunter contest-proven$400 No 354Merlyn RC Giant 155-in span Sailplane uses 3 RC channels$750 No 355Santos-Damontl4-bis RCSpsrt-Scalecanardbipefor15-power3-Oh spansS6 2 sheets$575 No 356Maule Lunar Rocket RC -Scale spans 925 5-ch flays 12 55 iv engine$1200 No 359Pieces FF Indoor Easy B Robber-power contest-winner W Van Gorder$1 00 No 359Blank Widow RC Fun-Scaly twin two tOn 4-oh RC spans 59 WW II night fighter$675 No 360Dragon CL Slow Combat winner has foam wing uses 36-power$500 No 361Electric Country Boy FF Record-holding duration craft far 02 motor$200 No 362Supercat RC Half-A Pylon Racer/sport flier Aileron elevator control Foam wing$200 No 363Tiger Rag CL Sport Stanter biplane 36-power$400 No 364NeutronStar RCSeek 40-size Patternflierwithtail draggerretracts enclosedpipe bout-up $525 No 365Seamaster RC Wrllards40-size flying boatfor4-ch Strap-on gearmakes ira landplannl 2 sheets$1100 No 366Truant PP Pert all-balsa beginners sport model 020-gamer$2 25 No 367P-39 Airacobra CL Sport-Scale uses water-cooled 45 engine mounted aft ostensive shaft$12 75 No 369Space Shuttle II RC Larger improved version Has glider 3-oh$550 No 369Super Star CL Semi-scale Stunter 35-power Easy boild has contest-proven capability$550 No 370CAP-21 RCOrantScaleof French aerobatic craftspans7ft Osadra power 2 sheetsdoc 0 No 371Strato-Streak RC Old-Timer version Garawis famoas 41 FF design power 2-ch$500 No 372Neigheion RC Low-wing tn-gear sportoter power 4-sb$500 No 373Cassutt II CL Profile Stanter 35 power Flaps$4 75 No 374Marissa FF Rubber-powered sportster Golden Age tradition$300 eeseeo..eeeeeeeeeeeeOOOO Circle numberlsj planss wish order 131168225239 285291299302 328332335337 253259260262 307310314317 338340341343 lock washers other bolt applications Flying What forthe first flight Enjoy nothing special know about flying twin unless engine goes out lose engine quickly cut throttle about half counter roll required amount rudder Keep nose level slightly down slowly feed throttle enough power get approach window cut throttle rudder offset make typical gliding approach Im trying oversimplify engine-out problem will keep simple rule mind will usually complete flight ease Dont try climb out engine Keep air speed nose level slightly down fly large diameter turns avoid sharp control move ments should get home very nicely Due unusually close nacelle position have advantage over Scale-type twins recommend use little rudder making low-speed approach turns both engines running Have nice flight Chupps Engine/Walker Continued page 83 distributor Apparently spark plugs threads also made because original insulators made Corning Glass Works replaced Mosler insulators carburetor used Little Bitty engine miniature Zenith carburetor use complete float weights valve stem hope Mr Chupps Zenith minia ture carburetor functioned better came VW Dasher calibrate carburetor Chupp study height gasoline bowl under various conditions glass tube rubber hose connection employed make tem porary sight gauge enabled him determine correct height orifice engine weighed 45 ounces Since no dynamometer available possible determine engines power theoretical ngine did turn 20in propeller 11-in pitch 2000 rpm gave static thrust seven pounds measured spring scale bench test 5-in flywheel produced 3000 rpm possibly because tach ometer used would measure 3000 rpm After approximately 15 minutes test stopped because cylinders showed signs overheating started turn light blue final comment concerned engine should used model airplanes Because extended manifold recommended 3such delicate precision equipment used 323 25326a pusher design would well protected 345347348during landings Engines type cannot hurled against obstructions damage article closed following still great unexplored possibilities field mechanically-driven aircraft hope experimenters will found active highly specialized art Chupp Little Bitty splendid example such effort lets have about using radio control Italics added 0000 0 0 0 269 278 282 350 353 354 355 356 358 359 360 361362 363 364365366 367 375 376 377 0 Please print carefully 368 369 370 371 Enclosed $ NAME STREET ______ CITY - STATE _________________________________________ ZIP __________ Price includes first-class postago Send Chock money order payable Mode/Aviation AMA 815 Fifteenth St NW. Wgahington DC 20005 372373374 0 0 0 0 0 -- 0 1 56 Model Aviation 0 0 S 0 0 0 S 0 Pull-size Plan List Available complete listing plans previously published magazine through No 364 may obtained free charge writing enclose stamped pre-addressed business size envelope Model Aviation 815 Fif teenth St NAN washington DC 20005
Edition: Model Aviation - 1982/08
Page Numbers: 83, 156
Cliupp ne Gas engines models Twen ties big heavy home made Pioneers such Carl B Chupp per severed pro duced splendid example its day IN THE AUGUST 1981 issue Model via tion presented Chupp seven-foot Little Bitty biplane built late 1 920s under title Big Birds Long Ago brief mention engine used power model made spite some research could beg borrow heaven forbid steal copy April 1930 issue Aero Digest sup posed have featured engine knowing model builders gentle man Washington State wrote mentioned copy might found didnt take long secure Xerox copy article Dick Seely Aero Literature PO Box 1441 Olym pia WA 98507 After examining material looked engine might interest some MAs readers first used power mini ature aircraft What about engine Aero Digest article K E Dowd provided following information plus lesson two- four-cycle engines ended quiz article engine plane designed con structed Mr Carl B Chupp factory manager old Pitcaim Aircraft Corp Willow Grove PA cylinders made solid bar 3% nickel steel stock no cooling fins wall thickness cylinders 1/32 liberal shoulder provided base cylinder fit against crankcase Pistons machined aluminum bar fitted two cast iron piston rings Apparently great number rings made before correct fit obtained Connecting rods machined solid steel bar fitted babbitt bearings double-throw crankshaft machined solid bar ran ball bearings crankcase milled turned solid aluminum stock large breather vent provided top crankcase permit easy lubrication Lubrication splash system proved satisfactory Cast iron cylinder heads used pro vided valve seats-for 5/I 6-in diameter valve heads made tungsten steel valve stems -in diameter Valve opening about 3/32-in Neat little pushrods actuate valves through small rocker arms 21 gears housed back engine camshaft used operate valves 5/64-in lift ignition system operated six-volt battery regular automotive storage battery remember six-volt back could used bench-testing engine flight purposes battery made up four D-size flashlight battery cells spark coil taken Dixie magneto maybe some real old-timers know about Dixie no modifications made Hard rubber used make distributor Contact points platinum enclosed breaker box Carbon brushes fitted Continued page 156 CHUPP LITTLE BITTY ENGINE TWO CYLINDER HORIZONTAL OPPOSED BORE STROKE CYLINDER CYLINDER HEAD SCALE IN INCHES II 0I2345B BREATHER CAMSHAFTVALVE PUSH ROD SPARKPLUG VALVE ROCKER VALVE VALVE SPRING INTAKE MANIFOLD FROM AERO DIGEST APRIL/1930 GEAR HOUSING r -CARBURETOR FLOAT STEM CARBURETOR BOWL CARBURETOR AIR INTAKE GAS LINE TO TANK NEEDLE VALVE DISTRIBUTOR INTERRUPTER BREAKER POINTS WEIGHT SCHEDULE ENGINE B CARBURETOR2Boz PROPELLER--B GASTANKBPIPE -____ 3 COIL__ __ ID BATTERY45 GASOLINE---— 2 TOTAL 53Soz August1982 83 No 375 Snapshot Twin$1100 RC Workhorse utility sport flier twin 35-40 engines 4-5 channel Foam wings lift up 12 lb Two sheets No 376 Auroroa$350 RC Sport/aerobatic flier 049-1 0 power uses 2-ch rudder/elevator 3-ch elevator/aileron/throttle No 377 Wingmaster$200 CL AA sport-stunter Profile fuselage sheet wing w/flaps No 131Gee Bee Model Y 40-powered RC stand-off scale great old-rime racers$500 No 169Simitar RCA spectacular flying wing 15 nose- moanted tractor$300 No 225Ole Reliable RC 70 version 38 old-timer REM controls 15-$425 No 239Sloe Birds RC Ken Willards formation plane 4-ch. 10$375 No 253Mitchell 5-25 RC 4-ft /aA twin Ace foam pannls WeII-behannd$350 No 259Chambermaid FF Bill Hesss soperlatise rsbbnr-powred scale winner.........$200 No 260Waco Custom CabinRC Don Srslis scalnr 1 5-20 REM controls$400 No 262Crashmaster CL Crash-proof trainer 2 siznst 5-30 35-40$125 No 291Cap 20 40-pownred scaln RC Frnnch aerobatic plane Low wing tail dragger 2 sheets No 295Geeflee Sr Sportster RC -scale Haffke 91 power Prototype spas 30 ft 214 sheets$11 75 No 302Mini F-iS RC Sarpolas 049 docted fan sport flier 2-oh Balsa wings tail fese stractare$275 No 307Pegasus RC Watsons giant soper sailplane featores flaps spoilers T-tail 166 wingspan$675 No 3101930 Fleet Biplane RC Sport Scale 35-40 4-ch Wingspan 56 1/6 scale Two sheets$625 No 314Drake II RC Ken Willards flying host 3-oh. 15-power Fly land removable gear$375 No 317Schweizer T63-A RC Sport Scale Sailplane Jack Hiner nan 11-ft span 3-oh Two sheets$1200 No 323Super voodoo CL Fast Combat John J0 featores built-op wing fast constraction wins1 $300 No 325Commodore RC Tesaco-class Old-Timer Onlan updates Shereshaws classic 3-oh for29-power 2sh $1000 No 326Taylor Cob RC Don Srslis Schoolyard-Scale 049s 2-3 oh Speos SO in$350 No 326BriseolScoutD RClltznchs Precision-Scale-sizespan73 bipefor91 power4 sheets$1650 No 332Zephyr RC Small 2-oh glider hand- laanch tow thermal slope soaring$200 No 335Sopwith Dolphin FF Bill Noonans Jsmbo-Rabber scale great WW I-vintage biplane$175 No 337Super Akin-i Chips RC Scale-like stunter S-ch 1 smoke salve 40-power 2 sheets$700 No 339Rearwio Jr RC Dos Mathews Sport Scale 4-ch 40-power Monoplane$525 No 340Mossie Stunter CL Twin 35-powered semi-scale based famous WW II Mosqaito bomber$400 No 341Brown 6-2 RC Scale-like sport flier 4-oh 19-29-power Race Qoickee hot 25$500 No 343Wasp vI FF Mike Stops Nats-winning Outdoor HLO$100 No 345La Jolita CL /oA Scale Racer Class also sport Moose$100 No 347Space Shuttle RC Sport-Scale glider 2-oh lasoch mother plane$1 75 No 349Onestep RC Trainer has very forgiving flying qualities 3-oh. 1 0-25 power$425 No 350Electric Spitfire RC Fun-Scale 15/25 electric 20-30 glow 3-oh spans 6 ft$750 No 353Sanitation CL Sleek 46-powered super- Saunter contest-proven$400 No 354Merlyn RC Giant 155-in span Sailplane uses 3 RC channels$750 No 355Santos-Damontl4-bis RCSpsrt-Scalecanardbipefor15-power3-Oh spansS6 2 sheets$575 No 356Maule Lunar Rocket RC -Scale spans 925 5-ch flays 12 55 iv engine$1200 No 359Pieces FF Indoor Easy B Robber-power contest-winner W Van Gorder$1 00 No 359Blank Widow RC Fun-Scaly twin two tOn 4-oh RC spans 59 WW II night fighter$675 No 360Dragon CL Slow Combat winner has foam wing uses 36-power$500 No 361Electric Country Boy FF Record-holding duration craft far 02 motor$200 No 362Supercat RC Half-A Pylon Racer/sport flier Aileron elevator control Foam wing$200 No 363Tiger Rag CL Sport Stanter biplane 36-power$400 No 364NeutronStar RCSeek 40-size Patternflierwithtail draggerretracts enclosedpipe bout-up $525 No 365Seamaster RC Wrllards40-size flying boatfor4-ch Strap-on gearmakes ira landplannl 2 sheets$1100 No 366Truant PP Pert all-balsa beginners sport model 020-gamer$2 25 No 367P-39 Airacobra CL Sport-Scale uses water-cooled 45 engine mounted aft ostensive shaft$12 75 No 369Space Shuttle II RC Larger improved version Has glider 3-oh$550 No 369Super Star CL Semi-scale Stunter 35-power Easy boild has contest-proven capability$550 No 370CAP-21 RCOrantScaleof French aerobatic craftspans7ft Osadra power 2 sheetsdoc 0 No 371Strato-Streak RC Old-Timer version Garawis famoas 41 FF design power 2-ch$500 No 372Neigheion RC Low-wing tn-gear sportoter power 4-sb$500 No 373Cassutt II CL Profile Stanter 35 power Flaps$4 75 No 374Marissa FF Rubber-powered sportster Golden Age tradition$300 eeseeo..eeeeeeeeeeeeOOOO Circle numberlsj planss wish order 131168225239 285291299302 328332335337 253259260262 307310314317 338340341343 lock washers other bolt applications Flying What forthe first flight Enjoy nothing special know about flying twin unless engine goes out lose engine quickly cut throttle about half counter roll required amount rudder Keep nose level slightly down slowly feed throttle enough power get approach window cut throttle rudder offset make typical gliding approach Im trying oversimplify engine-out problem will keep simple rule mind will usually complete flight ease Dont try climb out engine Keep air speed nose level slightly down fly large diameter turns avoid sharp control move ments should get home very nicely Due unusually close nacelle position have advantage over Scale-type twins recommend use little rudder making low-speed approach turns both engines running Have nice flight Chupps Engine/Walker Continued page 83 distributor Apparently spark plugs threads also made because original insulators made Corning Glass Works replaced Mosler insulators carburetor used Little Bitty engine miniature Zenith carburetor use complete float weights valve stem hope Mr Chupps Zenith minia ture carburetor functioned better came VW Dasher calibrate carburetor Chupp study height gasoline bowl under various conditions glass tube rubber hose connection employed make tem porary sight gauge enabled him determine correct height orifice engine weighed 45 ounces Since no dynamometer available possible determine engines power theoretical ngine did turn 20in propeller 11-in pitch 2000 rpm gave static thrust seven pounds measured spring scale bench test 5-in flywheel produced 3000 rpm possibly because tach ometer used would measure 3000 rpm After approximately 15 minutes test stopped because cylinders showed signs overheating started turn light blue final comment concerned engine should used model airplanes Because extended manifold recommended 3such delicate precision equipment used 323 25326a pusher design would well protected 345347348during landings Engines type cannot hurled against obstructions damage article closed following still great unexplored possibilities field mechanically-driven aircraft hope experimenters will found active highly specialized art Chupp Little Bitty splendid example such effort lets have about using radio control Italics added 0000 0 0 0 269 278 282 350 353 354 355 356 358 359 360 361362 363 364365366 367 375 376 377 0 Please print carefully 368 369 370 371 Enclosed $ NAME STREET ______ CITY - STATE _________________________________________ ZIP __________ Price includes first-class postago Send Chock money order payable Mode/Aviation AMA 815 Fifteenth St NW. Wgahington DC 20005 372373374 0 0 0 0 0 -- 0 1 56 Model Aviation 0 0 S 0 0 0 S 0 Pull-size Plan List Available complete listing plans previously published magazine through No 364 may obtained free charge writing enclose stamped pre-addressed business size envelope Model Aviation 815 Fif teenth St NAN washington DC 20005