COflirOl UfleNcvy CarnerRid-iard L Peny BACK IN THE October issue men tioned utility simplicity suction fuel systems month will discuss pressure systems related speed control methods primary advantage modelers think consider pres sure fuel systems pressure means power true because pressure fuel system allows use larger air intake engine power increase possible pressure system however small compared large suction type intake intake area just small part total engine performance An additional advantage pressure fuel systems Carrier models insensitive acceleration forces air craft attitude Fuel tank placement critical can important rather cramped fuselages some scale Carrier ships classify pressure systems pres sure source consider three main types pump systems crankcase pressure external pressure bladder pacifier Pump systems first attracted atten tion RC Pattern fliers about three years ago Yamada Mfg Co developed system distributed Model Rectifier Corp used pressurized tank feed regulator/pump forced fuel large carburetor Currently receiving much acceptance country Perry pump carburetor system Perry pump installed place normal backplate front-intake engine uses crankcase pressure variations pump fuel large-bore carburetor designed use pump pump system expen sive currently limited front-intake engines readily available should simple operate suction systemcontinued page 86 38 Model Aviation Top Fuel meter slide installation Harry Higley use crankcase pressure fuel system Above Pen bladder fuel tank Supertigre throttle provide simple reliable speed control Below Roland Baltes Roberts Corsair has gray basic color dark blue Outer wings rudder elevator white ailerons flaps orange Navy Reserve stripe ST 56 power Right Ito R Japanese Judy British Fulmar both built prominent Carrier flier flarn Wallik CL Navy Carrier/Perry continued page 38 Crankcase pressure systems far widely used systems Navy Carrier flying system pressure crankcase engine used force fuel sealed tank carbu retor pressure can timed un timed Untimed pressure obtained pressure fitting constantly open crankcase usually installed place backplate screw hole drilled through cylinder bypass Timed pressure uses intake valve open pressure fitting crankcase dur ing power stroke engine crankcase pressure highest Most rearintake engines have hole purpose already drilled backplate timedpressure system provides higher pressure no real difference operating procedures either method sys tem easy install sensitive to smallest air leak leaks can sometimes hard identify Crankcase pressure systems usually use exhaust restrictor speed con trol reduce fuel flow engine slowed fuel meter usually used conjunction exhaust restrictor Although fuel meter absolutely necessary its use provides slower reliable idle method speed ATTENTION NATIONALS CONTESTANTS Fly FOX products 1976 Nationals win CASH AWARD addition trophy $200 cash 1st place events Combat r Open CL Stunt r Open RC Pattern s D RC Quarter Midget $100 cash 1st place other event Requirements win using Fox engine fuel plug Procedure een 5 PM 10 PM bring winning model trophy motel will take pictures get advertising releases signed hand check Fox introducing several new products may wish try partial list Fox 36 Rear Exhaust mproved version motor won Profile carrier 1975 Available Ball Bearing & Bushing versions FOX combat Special tically improved over 1975 model Bore powersmoother runningmore durable Insert available slow Combat Fox lSBB lable several variations competition model features A' crank shaft structure race over 30000 RPM FOX MANUFACTURING CO 5305 Towson / Ft Smith AR 72901 control instructions installing exhaust slide engine thor oughly discussed February 1974 issue Model Airplane News photo type speed control installed engine appears column Ex haust slides fuel meters avail able Harry Higley 433 Arquilla Dr Glenwood IL 60425 Dave Wallick 158 Brookvalley Dr Elyria OH 44035 Art Adamisin 22454 Fair fax Taylor MI 48180 makes rotary exhaust baffle Another method speed control crankcase pressure on-off pressure system method uses intake throt tle valve either switches fuel feed separate tank releases pressure tank provide fuel suction throttle closed reduced pressure tank serves same purpose fuel meter reducing fuel flow idle Kavan makes throttle pressure-relief valve built body Kavan also includes simple fuel meter help ease transition off pressure Because pressure-relief valve Kavan requires little force operate throttles particularly idle can disadvantage Carrier flying have overcome prob lem using Kavan throttle con junction exhaust restrictor Kavan spring-loaded remain closed after closed first time idle adjustment set give about 12000 rpm exhaust restrictor open ex haust restrictor used control engine speed providing system re quires almost no force operate method using exhaust restrictor speed control suction fuel system pioneered Roberts Van-speed back early days Car rier flying provides reliable simple method speed control good engine response might worth considering Profile Carrier Class II can simple primary system emergency back-up problems leaks develop fuel-meter/exhaust-restrictor systemjust disconnect pressure line drop smaller venturi fly reason intake throttles alone difficult use crankcase pressure systems throttle closes crankcase pressure changes mixture adjustments can become quite critical impossible really low idle brings us external pressure systemsbladders pacifierswhich rely engine pressure source widely used Combat Speed except airplanes have never seen used Carrier photo system appears column simple adjust suc tion system very reliable throttle can throttle built-in fuel meter such Supertigre MAG Perry carburetors Supertigre Perry carbs can bored out slightly increase area addition sides spray bar Supertigre MAG can filed down increase intake area new Perry carbs designed use Perry pump might quite suitable modifica tion bit unusual equipment re quired means closing off fuel line before engine started Combat fliers use large spring-type paper clips exposed fuel line use simple cut-off fits behind engine use Tatone bladders Sig Mfg Co carries well CMI Captains Bladders tYlel fillers visit Combat circles can provide information installa tion operation additional sources materials hope have answered some hows whys pressure fuel systems re lated speed-control methods newcomer Carrier will have idea what available Perhaps experienced modelers have seen something like better present system have system better systems mentioned just different let us hear about Carrier modelers use some rather specialized equipment always readily available corner hobby shop have listed some sources materi als services column have product would useful Carrier modelers let hear information can appear column address 5016 Angelita Ave Dayton OH 45424 WANTED ideas happenings hints/kinks how-to sketches photos news etc Send columnist category concernedat address shown column photo idea printed Model Aviation will pay $5 contributor FF Sport/Kuenz continued page 31 least two firms importing qual ity brown rubber received samples Sterling Models via AMA Hdqrts Vintage Aero Both 1mm X 3mm size appeared same ma terial looks feels much like Pirelli diagonal collander marks compared piece 3mm Pirelli Pirelli averaged 045 thick new rubber 1mm thinner 1mm same length rubber motor new stuff correspondingly lighter Pirelli indicating approximately same density Three single-loop motors tested destruction averaged 80 86 Model Aviation
Edition: Model Aviation - 1976/04
Page Numbers: 38, 86
COflirOl UfleNcvy CarnerRid-iard L Peny BACK IN THE October issue men tioned utility simplicity suction fuel systems month will discuss pressure systems related speed control methods primary advantage modelers think consider pres sure fuel systems pressure means power true because pressure fuel system allows use larger air intake engine power increase possible pressure system however small compared large suction type intake intake area just small part total engine performance An additional advantage pressure fuel systems Carrier models insensitive acceleration forces air craft attitude Fuel tank placement critical can important rather cramped fuselages some scale Carrier ships classify pressure systems pres sure source consider three main types pump systems crankcase pressure external pressure bladder pacifier Pump systems first attracted atten tion RC Pattern fliers about three years ago Yamada Mfg Co developed system distributed Model Rectifier Corp used pressurized tank feed regulator/pump forced fuel large carburetor Currently receiving much acceptance country Perry pump carburetor system Perry pump installed place normal backplate front-intake engine uses crankcase pressure variations pump fuel large-bore carburetor designed use pump pump system expen sive currently limited front-intake engines readily available should simple operate suction systemcontinued page 86 38 Model Aviation Top Fuel meter slide installation Harry Higley use crankcase pressure fuel system Above Pen bladder fuel tank Supertigre throttle provide simple reliable speed control Below Roland Baltes Roberts Corsair has gray basic color dark blue Outer wings rudder elevator white ailerons flaps orange Navy Reserve stripe ST 56 power Right Ito R Japanese Judy British Fulmar both built prominent Carrier flier flarn Wallik CL Navy Carrier/Perry continued page 38 Crankcase pressure systems far widely used systems Navy Carrier flying system pressure crankcase engine used force fuel sealed tank carbu retor pressure can timed un timed Untimed pressure obtained pressure fitting constantly open crankcase usually installed place backplate screw hole drilled through cylinder bypass Timed pressure uses intake valve open pressure fitting crankcase dur ing power stroke engine crankcase pressure highest Most rearintake engines have hole purpose already drilled backplate timedpressure system provides higher pressure no real difference operating procedures either method sys tem easy install sensitive to smallest air leak leaks can sometimes hard identify Crankcase pressure systems usually use exhaust restrictor speed con trol reduce fuel flow engine slowed fuel meter usually used conjunction exhaust restrictor Although fuel meter absolutely necessary its use provides slower reliable idle method speed ATTENTION NATIONALS CONTESTANTS Fly FOX products 1976 Nationals win CASH AWARD addition trophy $200 cash 1st place events Combat r Open CL Stunt r Open RC Pattern s D RC Quarter Midget $100 cash 1st place other event Requirements win using Fox engine fuel plug Procedure een 5 PM 10 PM bring winning model trophy motel will take pictures get advertising releases signed hand check Fox introducing several new products may wish try partial list Fox 36 Rear Exhaust mproved version motor won Profile carrier 1975 Available Ball Bearing & Bushing versions FOX combat Special tically improved over 1975 model Bore powersmoother runningmore durable Insert available slow Combat Fox lSBB lable several variations competition model features A' crank shaft structure race over 30000 RPM FOX MANUFACTURING CO 5305 Towson / Ft Smith AR 72901 control instructions installing exhaust slide engine thor oughly discussed February 1974 issue Model Airplane News photo type speed control installed engine appears column Ex haust slides fuel meters avail able Harry Higley 433 Arquilla Dr Glenwood IL 60425 Dave Wallick 158 Brookvalley Dr Elyria OH 44035 Art Adamisin 22454 Fair fax Taylor MI 48180 makes rotary exhaust baffle Another method speed control crankcase pressure on-off pressure system method uses intake throt tle valve either switches fuel feed separate tank releases pressure tank provide fuel suction throttle closed reduced pressure tank serves same purpose fuel meter reducing fuel flow idle Kavan makes throttle pressure-relief valve built body Kavan also includes simple fuel meter help ease transition off pressure Because pressure-relief valve Kavan requires little force operate throttles particularly idle can disadvantage Carrier flying have overcome prob lem using Kavan throttle con junction exhaust restrictor Kavan spring-loaded remain closed after closed first time idle adjustment set give about 12000 rpm exhaust restrictor open ex haust restrictor used control engine speed providing system re quires almost no force operate method using exhaust restrictor speed control suction fuel system pioneered Roberts Van-speed back early days Car rier flying provides reliable simple method speed control good engine response might worth considering Profile Carrier Class II can simple primary system emergency back-up problems leaks develop fuel-meter/exhaust-restrictor systemjust disconnect pressure line drop smaller venturi fly reason intake throttles alone difficult use crankcase pressure systems throttle closes crankcase pressure changes mixture adjustments can become quite critical impossible really low idle brings us external pressure systemsbladders pacifierswhich rely engine pressure source widely used Combat Speed except airplanes have never seen used Carrier photo system appears column simple adjust suc tion system very reliable throttle can throttle built-in fuel meter such Supertigre MAG Perry carburetors Supertigre Perry carbs can bored out slightly increase area addition sides spray bar Supertigre MAG can filed down increase intake area new Perry carbs designed use Perry pump might quite suitable modifica tion bit unusual equipment re quired means closing off fuel line before engine started Combat fliers use large spring-type paper clips exposed fuel line use simple cut-off fits behind engine use Tatone bladders Sig Mfg Co carries well CMI Captains Bladders tYlel fillers visit Combat circles can provide information installa tion operation additional sources materials hope have answered some hows whys pressure fuel systems re lated speed-control methods newcomer Carrier will have idea what available Perhaps experienced modelers have seen something like better present system have system better systems mentioned just different let us hear about Carrier modelers use some rather specialized equipment always readily available corner hobby shop have listed some sources materi als services column have product would useful Carrier modelers let hear information can appear column address 5016 Angelita Ave Dayton OH 45424 WANTED ideas happenings hints/kinks how-to sketches photos news etc Send columnist category concernedat address shown column photo idea printed Model Aviation will pay $5 contributor FF Sport/Kuenz continued page 31 least two firms importing qual ity brown rubber received samples Sterling Models via AMA Hdqrts Vintage Aero Both 1mm X 3mm size appeared same ma terial looks feels much like Pirelli diagonal collander marks compared piece 3mm Pirelli Pirelli averaged 045 thick new rubber 1mm thinner 1mm same length rubber motor new stuff correspondingly lighter Pirelli indicating approximately same density Three single-loop motors tested destruction averaged 80 86 Model Aviation