AEROBATICS Wynn Paul THAT old bugabooMy engine wont run rightcame up again other night got call Beaumont TX regarding kit-built Gieseke Nobler built-in tank engine go lean time plane got air So lets go through complete process attempting clear up engine problem Since adjusting needle valve did keep plane going lean air easiest thing first substitute engines see problem persists does problem can tank fuel fuel line filter article lets assume problem still occurs did Beaumont Nobler Check fuel line filter pinholes check filter leak clogged screen easiest thing replace fuel line entirely new fuel line Watch bend fuel tubing dont kink item should consider cowling cowling fits very closely around engine less clearance may allowing enough air circulate therefore causing engine heat up go lean may especially true entire head projecting cowl other hand cowl very loose fit around engine head half-inch clearance may nos forcing enough circulation cooling air around fins engine could actually overheat although somewhat doubt occurrence Dave Rees some thoughts airflow through cowlings Dazzler 40 article Flying Models November 1976 p 31 speculated air travels helical flow clockwise viewed front plane said cowling should designed take helical flow account putting intake inboard side plane air exhaust outboard side brief plane does run lean consistently try cowl see things improve Also may try Rabe engine shroud piece tin stock about 7/ high 3 /2 long long enough leave about V3 circumference fins open front engine shroud held piece wire very back engine hole cut shroud about /2 air out after circulating way around fins shroud supposed evenly distribute cooling air way around fins engine Back built-in tank problems engine going lean probably means excess air getting mixture assuming engine running lean level flight during inverted flight tank goes rich plane inverted really have problems besides air fuel will have change engine height relative center line tank pick-up tube Moving engine away engine bearers will make run lean inverted flight inverted engine installations pick-up tube may cracked point entry various tubes pick-up vents tank may have leak built-in tank may able replace pick-up tube going through firewall although pick-up tubes soldered rear tank may able put new pick-up tube see helps didnt clean out commercially bought tank shame some solder flux other foreign substance may have broken loose lodged pick-up tube restricting fuel flow may try forcing fuel under pressure back through pick-up tube out vents certain put tubing vents point ends away face Use fuel bulb high pressure line force fuel thinner through pick-up tubing try detergent cleaning agent certain fill tank full model fuel drain completely before refilling attempting fly again ne Martine Jacksonville FLand Mariner Craft features foam MIKE ulsrlcn re rA crafted exquisite cowling fully encloses wing OS Max 40 FSR engine Finish Sig paint Weighs 54 oz thecylinderhead Noteuseof extensionshaft heartahapedairoutlets 44 Model Aviation Walt Brownell Wentzville MO produced version Gieseke Nobler kit powers Fox 35 DuBro muffler Sullivan RST4 clunk tank removable Aero Gloss finish third component inspect fuel two engines run lean same fuel tank could fuel problem instance last summer kept having lean runs Friday Saturday before contest After trying three different engines different plugs taking tank out testing leaks three times changing fuel lines filters testing tank vents testing muffler pressure line making certain muffler pressure fitting hole stopped up engine residue using three different props making trip midnight Saturday Dan Shafers house resolder seams tank just about ready throw airplane Little Miami river next Dayton circles suddenly dawned changed everything except fuel Since use Dukes Fuel thought about realized might have acciden tally used can old fuel might have picked up some moisture borrowed some fuel everything worked again mix own fuel dont afraid admit might have mixed correctly got bad batch fuel Try two differ ent types fuel see helps problem above problems center around toolean run What have too rich run could wrong level tank could too much muffler pressure quite rare may need use idle bar plug idle bar plugs seem keep loading up sometimes happens regular plug suspect engine lean run syndrome inspect loose head loose back plate clogged spray bar frequent happen ing burrs inside Supertigre spray bar spray bar turned fuel metering orifice hole spray bar points down venturi Fox 35 holes should right angles venturi barrel Lastly ringed engine may have too small gap causing ring expand resultant friction sleeve terrific rise operating temperature can cause very lean run engine may seize above ideas fail youll just have cut Out tank better cut hang plane wall Bob Gieseke has resigned 1980 FAL Look ~kat found ths rtoriiIrs rrilLs r- ry closet team therefore two-time World Champion Bill Werwage will USA team goes Poland summer World Champion ships Bill Dennis Harkai attempting market Bills Juno airplane kit form themselves price $5995 interested write Airborne Mfg P0 Box 113 Sagamore Hills OH 44067 information PAMPA stunt contact Wynn Paul 1640 Maywick Dr Lexington KY 40504 AT LAST SOME Lj MATTER FROM HOBBYPOXY PrimerWeve taken popular two-part white primer-undercoat formula made gray Just gray enough please have told us want see dents nicks ripples youre sanding Now make little visible just efficient ever course its still available white too Wood Plastic Metal Fiberglass Hobbypoxy primer-undercoater covers well cures fills fast shrinking easy sand provides smooth-as-glass surface. great adhesion wood plastic metal fiberglass Whether youre balsa builder molded plastic buff whether brush spray now put little color life Hobbypoxy gray undercoat. good ever lot visible complete information how-to-do-it Hobbypoxy Finishing Guide write today ARNIIKAIIUA DivisIon Pettit Paint Co Inc H unniruAt PRODUCTS 32 Pine Street Rockaway NJ 07866 U ndercoater Nawin HOBBYPOXY ct group finishing products especially formulated hobbyists including Epoxy Glues Epoxy-enamel Painls Fillers Primer-undercoaters Resins August 198045 LOK f 11i5
Edition: Model Aviation - 1980/08
Page Numbers: 44, 45
AEROBATICS Wynn Paul THAT old bugabooMy engine wont run rightcame up again other night got call Beaumont TX regarding kit-built Gieseke Nobler built-in tank engine go lean time plane got air So lets go through complete process attempting clear up engine problem Since adjusting needle valve did keep plane going lean air easiest thing first substitute engines see problem persists does problem can tank fuel fuel line filter article lets assume problem still occurs did Beaumont Nobler Check fuel line filter pinholes check filter leak clogged screen easiest thing replace fuel line entirely new fuel line Watch bend fuel tubing dont kink item should consider cowling cowling fits very closely around engine less clearance may allowing enough air circulate therefore causing engine heat up go lean may especially true entire head projecting cowl other hand cowl very loose fit around engine head half-inch clearance may nos forcing enough circulation cooling air around fins engine could actually overheat although somewhat doubt occurrence Dave Rees some thoughts airflow through cowlings Dazzler 40 article Flying Models November 1976 p 31 speculated air travels helical flow clockwise viewed front plane said cowling should designed take helical flow account putting intake inboard side plane air exhaust outboard side brief plane does run lean consistently try cowl see things improve Also may try Rabe engine shroud piece tin stock about 7/ high 3 /2 long long enough leave about V3 circumference fins open front engine shroud held piece wire very back engine hole cut shroud about /2 air out after circulating way around fins shroud supposed evenly distribute cooling air way around fins engine Back built-in tank problems engine going lean probably means excess air getting mixture assuming engine running lean level flight during inverted flight tank goes rich plane inverted really have problems besides air fuel will have change engine height relative center line tank pick-up tube Moving engine away engine bearers will make run lean inverted flight inverted engine installations pick-up tube may cracked point entry various tubes pick-up vents tank may have leak built-in tank may able replace pick-up tube going through firewall although pick-up tubes soldered rear tank may able put new pick-up tube see helps didnt clean out commercially bought tank shame some solder flux other foreign substance may have broken loose lodged pick-up tube restricting fuel flow may try forcing fuel under pressure back through pick-up tube out vents certain put tubing vents point ends away face Use fuel bulb high pressure line force fuel thinner through pick-up tubing try detergent cleaning agent certain fill tank full model fuel drain completely before refilling attempting fly again ne Martine Jacksonville FLand Mariner Craft features foam MIKE ulsrlcn re rA crafted exquisite cowling fully encloses wing OS Max 40 FSR engine Finish Sig paint Weighs 54 oz thecylinderhead Noteuseof extensionshaft heartahapedairoutlets 44 Model Aviation Walt Brownell Wentzville MO produced version Gieseke Nobler kit powers Fox 35 DuBro muffler Sullivan RST4 clunk tank removable Aero Gloss finish third component inspect fuel two engines run lean same fuel tank could fuel problem instance last summer kept having lean runs Friday Saturday before contest After trying three different engines different plugs taking tank out testing leaks three times changing fuel lines filters testing tank vents testing muffler pressure line making certain muffler pressure fitting hole stopped up engine residue using three different props making trip midnight Saturday Dan Shafers house resolder seams tank just about ready throw airplane Little Miami river next Dayton circles suddenly dawned changed everything except fuel Since use Dukes Fuel thought about realized might have acciden tally used can old fuel might have picked up some moisture borrowed some fuel everything worked again mix own fuel dont afraid admit might have mixed correctly got bad batch fuel Try two differ ent types fuel see helps problem above problems center around toolean run What have too rich run could wrong level tank could too much muffler pressure quite rare may need use idle bar plug idle bar plugs seem keep loading up sometimes happens regular plug suspect engine lean run syndrome inspect loose head loose back plate clogged spray bar frequent happen ing burrs inside Supertigre spray bar spray bar turned fuel metering orifice hole spray bar points down venturi Fox 35 holes should right angles venturi barrel Lastly ringed engine may have too small gap causing ring expand resultant friction sleeve terrific rise operating temperature can cause very lean run engine may seize above ideas fail youll just have cut Out tank better cut hang plane wall Bob Gieseke has resigned 1980 FAL Look ~kat found ths rtoriiIrs rrilLs r- ry closet team therefore two-time World Champion Bill Werwage will USA team goes Poland summer World Champion ships Bill Dennis Harkai attempting market Bills Juno airplane kit form themselves price $5995 interested write Airborne Mfg P0 Box 113 Sagamore Hills OH 44067 information PAMPA stunt contact Wynn Paul 1640 Maywick Dr Lexington KY 40504 AT LAST SOME Lj MATTER FROM HOBBYPOXY PrimerWeve taken popular two-part white primer-undercoat formula made gray Just gray enough please have told us want see dents nicks ripples youre sanding Now make little visible just efficient ever course its still available white too Wood Plastic Metal Fiberglass Hobbypoxy primer-undercoater covers well cures fills fast shrinking easy sand provides smooth-as-glass surface. great adhesion wood plastic metal fiberglass Whether youre balsa builder molded plastic buff whether brush spray now put little color life Hobbypoxy gray undercoat. good ever lot visible complete information how-to-do-it Hobbypoxy Finishing Guide write today ARNIIKAIIUA DivisIon Pettit Paint Co Inc H unniruAt PRODUCTS 32 Pine Street Rockaway NJ 07866 U ndercoater Nawin HOBBYPOXY ct group finishing products especially formulated hobbyists including Epoxy Glues Epoxy-enamel Painls Fillers Primer-undercoaters Resins August 198045 LOK f 11i5