DB Mathews UyUuziy 2IC2~ Litciuzi 1 Ii Beginning late 1970s few RC Radio Control modelers began build fly much larger aircraft previously seen Several factors involved development seven- 12-foot-span model aircraft weighed 15 pounds including airplane bigger yours smoother flying characteristics particularly windy weather improved visibility use less-expensive building materials engines Recalling early days Bud Nosen series large Scale models originally designed around 60 cubic inch cu two-stroke engines Because largest model aircraft engines available Several manufacturers notably Du-Bro produced belt-driven reduction gear propeller drive units enable 60s turn larger propeller sizes possible use 16- 20-inchdiameter propellers 60s order clear cowls new large models Several pioneers large models began convert gasoline-powered chain saw grass trimmer engines propeller-swingers lopment really set off big-airplane explosion Canadian-built 35 cubic centimeter cc Quadra chain saw engine really first converted model airplane use others such Kawasaki Kioritz now Zenoah McCulloch Roper also modified Almost conversions done individual users several ready-to-go engines became available shortly thereafter bewildering selection gasburners ranging 20cc 120 cu gigantic 240cc 144 cu units capable pulling huge models straight up Actually latter may better suited ultralights model aircraft thats another subject industrial power plants much larger powerful traditional glow model aircraft engines run much-less-expensive gasolineand-oil mixes much heavier distinct advantage nose weight such large models Most importantly construction much robust model aircraft engines big engines usually have bearings both ends rod crankshaft engineered survive considerable punishment intended misuse Being used cut trees woods hours end tossed back pickup much wipedown getting occasional dose old dirty fuel oil mix way abuse would subjected modeler Its little wonder barring crash damage chain saw/grass trimmer engines last hundreds hours modeling use Dennis Richeinberger flying buddy has Quadra 35 converted model use almost 20 years ago flies regularly Its gone through few carburetor kits some coil changes have made runs well after use Chain saw/grass trimmer engines have pump-type two-jet carburetors can set forgotten greatly simplifying tank placement model final virtue conversions mind least power curve favors lower rpm justifying use large propellers spite wonderful user-friendly qualities converted power plants several distinct problems Foremost requirement cranking relatively high speeds obtain sufficient spark magneto fire plug Recoil spring starters developed shortcoming Also magneto coil flywheel usually bulky inconveniently located making difficult cowl neatly nose model airplane Bill Carpenters CH Electronics solved ignition problem years ago Capacitive Discharge Ignition CDI systems has become something industry standard engines sold converters Carpenter units gas burners start easily have solid spark throughout speed range minimum radio interference major remaining complaint about big bangers noise denial about amount 134 Model Aviation Carpenter-converted Honda four-strokeSig 1/3-scale 1946 Crosley automobile engine prototype Mooney MiteP Spacewalker 18 x 8 Master Airscrew prop Note oil filler neck 51-type scoop radiator Replaced Continental 65 sound coming out large engines have ever noticed flies flying field conversations stop make big noise Although several innovators have developed excellent mufflers greatly reduce exhaust noise have never caught almost case mufflers exhaust deflectors best Perhaps nonmodeling publics feelings about noise can best illustrated ordinance passed Los Angeles CA county outlawing use grass trimmers leaf blowers chain saws ordinance has subsequently amended allow use during certain hours day piece news doesnt seem pertinent consider nearly public flying site lost country has because noise public drunkenness obnoxiousness carelessness environment pure raw annoying noise Europe has stringent noise restrictions powered model aircraft leaving distinct threat same thing happening US dont become responsible sensitive communities Surely would rather tone down noise spend nice flying days watching videos last years fly-in wishing still place fly Start Something New flying fields US Europe limited Electric power four-stroke engines four-stroke quieter two-stroke because fuel air mixture explodes half times per revolution What earthly good does prefer big airplanes Bill Carpenter has given glimpse what may forced future large model engines Honda Motors Japan has developed now marketing four-stroke power plant grass trimmers blowers begin solve some noise problems also pollution concerns associated lawn care Honda contacted Carpenter inquire its engine might have modeling applications accepted challenge After months development model conversion being demonstrated available CH Electronics Box 1732 Riverton WY 82501 Tel 307 857-6897 saw Honda 35cc four-stroke conversions run June 1998 noise levels remarkably low can talk normal tone immediately behind running engine propeller heard consistently starts first flip exceptionally well made Honda also big house ugly sin Nonetheless its hopefully first example what will series developments large-but-quiet fourstroke power plants suitable modeling use Numbers extraneous grass trimmer parts removed equipped Bill Carpenters CDI auto advance system Honda four-stroke weighs four pounds Its footprint mounting directly firewall 4 inches x 4 inches oil lOW-40 passed through engine pressure system mixed gasoline Honda recommends changing oil after 50 hours running adjusting valves after 200 hours bunch 10-minute flights Imagine flying buddy saying Ill little late field Ive got change oil model Thats different Fuel consumption about gallon regular unleaded gasoline per hour Bill Terry have developed several modifications stock enginemost notably increasing lift valves changing cams single camshaft using larger carburetor measuring 5800 rpm 20 x 8 propeller 7200 18 x 8 make numbers mean something Hondas flying Sig /3-scale Spacewalker enough oomph loops level flight wont torque rolls neither will full-scale prototype Honda comparable old style non-Surpass OS 120F5 important numbers rationale behind write-up 80 decibels nine feet exactly Electric power sound numbers fuel certainly much lighter Hondas current price complete ready run machining done $485 conversion kit do-it yourselfers also available Looking Ahead Bill has advised Honda will market 50cc single 100cc twin later year Terry will pursue development will keep us informed conversion photos rather large bulky relative its power future may well bring strong yet quiet fourstroke big-bore engines Editors note reminder AMA liability insurance apply models must have takeoff weight 55 pounds less Out Pulpit Ive preachy month Ill inject little levity proceedings granddaughter story took nine-year-old Melanie out Radio Control flying site have some fun Rubber power models noticed frequency board its numbers asked what did Mel quickly grasped soot down concept bit baffled numbers Grandpa numbers mean fliers age asked Well honey often fly Channel 17 replied smiling Quick flash responded Well sure cant mber 1998 135 RTF comes completely assembled covered creation granddaughter Marlena mother course
Edition: Model Aviation - 1998/11
Page Numbers: 134, 135
Edition: Model Aviation - 1998/11
Page Numbers: 134, 135
DB Mathews UyUuziy 2IC2~ Litciuzi 1 Ii Beginning late 1970s few RC Radio Control modelers began build fly much larger aircraft previously seen Several factors involved development seven- 12-foot-span model aircraft weighed 15 pounds including airplane bigger yours smoother flying characteristics particularly windy weather improved visibility use less-expensive building materials engines Recalling early days Bud Nosen series large Scale models originally designed around 60 cubic inch cu two-stroke engines Because largest model aircraft engines available Several manufacturers notably Du-Bro produced belt-driven reduction gear propeller drive units enable 60s turn larger propeller sizes possible use 16- 20-inchdiameter propellers 60s order clear cowls new large models Several pioneers large models began convert gasoline-powered chain saw grass trimmer engines propeller-swingers lopment really set off big-airplane explosion Canadian-built 35 cubic centimeter cc Quadra chain saw engine really first converted model airplane use others such Kawasaki Kioritz now Zenoah McCulloch Roper also modified Almost conversions done individual users several ready-to-go engines became available shortly thereafter bewildering selection gasburners ranging 20cc 120 cu gigantic 240cc 144 cu units capable pulling huge models straight up Actually latter may better suited ultralights model aircraft thats another subject industrial power plants much larger powerful traditional glow model aircraft engines run much-less-expensive gasolineand-oil mixes much heavier distinct advantage nose weight such large models Most importantly construction much robust model aircraft engines big engines usually have bearings both ends rod crankshaft engineered survive considerable punishment intended misuse Being used cut trees woods hours end tossed back pickup much wipedown getting occasional dose old dirty fuel oil mix way abuse would subjected modeler Its little wonder barring crash damage chain saw/grass trimmer engines last hundreds hours modeling use Dennis Richeinberger flying buddy has Quadra 35 converted model use almost 20 years ago flies regularly Its gone through few carburetor kits some coil changes have made runs well after use Chain saw/grass trimmer engines have pump-type two-jet carburetors can set forgotten greatly simplifying tank placement model final virtue conversions mind least power curve favors lower rpm justifying use large propellers spite wonderful user-friendly qualities converted power plants several distinct problems Foremost requirement cranking relatively high speeds obtain sufficient spark magneto fire plug Recoil spring starters developed shortcoming Also magneto coil flywheel usually bulky inconveniently located making difficult cowl neatly nose model airplane Bill Carpenters CH Electronics solved ignition problem years ago Capacitive Discharge Ignition CDI systems has become something industry standard engines sold converters Carpenter units gas burners start easily have solid spark throughout speed range minimum radio interference major remaining complaint about big bangers noise denial about amount 134 Model Aviation Carpenter-converted Honda four-strokeSig 1/3-scale 1946 Crosley automobile engine prototype Mooney MiteP Spacewalker 18 x 8 Master Airscrew prop Note oil filler neck 51-type scoop radiator Replaced Continental 65 sound coming out large engines have ever noticed flies flying field conversations stop make big noise Although several innovators have developed excellent mufflers greatly reduce exhaust noise have never caught almost case mufflers exhaust deflectors best Perhaps nonmodeling publics feelings about noise can best illustrated ordinance passed Los Angeles CA county outlawing use grass trimmers leaf blowers chain saws ordinance has subsequently amended allow use during certain hours day piece news doesnt seem pertinent consider nearly public flying site lost country has because noise public drunkenness obnoxiousness carelessness environment pure raw annoying noise Europe has stringent noise restrictions powered model aircraft leaving distinct threat same thing happening US dont become responsible sensitive communities Surely would rather tone down noise spend nice flying days watching videos last years fly-in wishing still place fly Start Something New flying fields US Europe limited Electric power four-stroke engines four-stroke quieter two-stroke because fuel air mixture explodes half times per revolution What earthly good does prefer big airplanes Bill Carpenter has given glimpse what may forced future large model engines Honda Motors Japan has developed now marketing four-stroke power plant grass trimmers blowers begin solve some noise problems also pollution concerns associated lawn care Honda contacted Carpenter inquire its engine might have modeling applications accepted challenge After months development model conversion being demonstrated available CH Electronics Box 1732 Riverton WY 82501 Tel 307 857-6897 saw Honda 35cc four-stroke conversions run June 1998 noise levels remarkably low can talk normal tone immediately behind running engine propeller heard consistently starts first flip exceptionally well made Honda also big house ugly sin Nonetheless its hopefully first example what will series developments large-but-quiet fourstroke power plants suitable modeling use Numbers extraneous grass trimmer parts removed equipped Bill Carpenters CDI auto advance system Honda four-stroke weighs four pounds Its footprint mounting directly firewall 4 inches x 4 inches oil lOW-40 passed through engine pressure system mixed gasoline Honda recommends changing oil after 50 hours running adjusting valves after 200 hours bunch 10-minute flights Imagine flying buddy saying Ill little late field Ive got change oil model Thats different Fuel consumption about gallon regular unleaded gasoline per hour Bill Terry have developed several modifications stock enginemost notably increasing lift valves changing cams single camshaft using larger carburetor measuring 5800 rpm 20 x 8 propeller 7200 18 x 8 make numbers mean something Hondas flying Sig /3-scale Spacewalker enough oomph loops level flight wont torque rolls neither will full-scale prototype Honda comparable old style non-Surpass OS 120F5 important numbers rationale behind write-up 80 decibels nine feet exactly Electric power sound numbers fuel certainly much lighter Hondas current price complete ready run machining done $485 conversion kit do-it yourselfers also available Looking Ahead Bill has advised Honda will market 50cc single 100cc twin later year Terry will pursue development will keep us informed conversion photos rather large bulky relative its power future may well bring strong yet quiet fourstroke big-bore engines Editors note reminder AMA liability insurance apply models must have takeoff weight 55 pounds less Out Pulpit Ive preachy month Ill inject little levity proceedings granddaughter story took nine-year-old Melanie out Radio Control flying site have some fun Rubber power models noticed frequency board its numbers asked what did Mel quickly grasped soot down concept bit baffled numbers Grandpa numbers mean fliers age asked Well honey often fly Channel 17 replied smiling Quick flash responded Well sure cant mber 1998 135 RTF comes completely assembled covered creation granddaughter Marlena mother course
