Control Line Aerobatics THERE ARE FOUR popular systems fuel delivery precision aerobatics suction uni-flow muffler pressure clunk Tank capacity seems pretty standard 35 40 ounces 35 engine 50 55 ounces 46 tank sizes should allow either AMA FAI patterns Unfortunately no manufacturer makes 50 ounce tank Stunt yet although Randys Model Aeronautics formerly Dons Tanks 515 Coleman Blvd Mt Pleasant SC 29464 may have avail able time article published As reminder old Veco tank now known Clary height width two sizing length tank inches equals capacity ounces fore five-in long tank has capacity five ounces Most everyone flies Stunt will revent stock tank using brass copper tubing / K&S soft brass good use because can bent easily copper tubing used must annealed make bend easily Some fliers insert next size smaller tubing vent tube cut down amount air entering tank theory getting too much pressure installing tubing good idea use shortened ice pick awl punch hole tin stock will leave rim metal around hole giving base better solder joint old faithful suction fuel system consists two vents bottom tank top tank writer has good results using 45-degree bevel end vent tubing soldering tubing inside end just touches tank wall necessary solder beveled ends vent tubes tank wall However certain solder beveled end pick-up tube Wynn Paul vent tubes usually placed front tank pick-up tube should extend rear tank 45-degree bevel should either touch rear wall placed 1/32 depending upon choice Both setups have used successfully As has explained times place pickup tube parallel engine bearers directly line spray bar Certainly some have experimented other locations top fliers stick setup usually have consistent runs Most everyone uses some sort baffle suction tank See diagram 1 Some stunters have used two baffles World champion Bill Werwage doesnt use baffle suction sys tem pressure however words world champ Bob Gieseke Cleanli ness next Godliness especially ap plied tanks Sudsy ammonia best tank cleaner Clean good about four six hours before installing plane Flush water alcohol get water out Finally put little fuel prevent rusting DIAGRAM NO 1 SUCTION TANK TOP VIEW uni-flow tank favored fliers including Nationals-placing Gene Schaffer Les McDonald Bill Simons Uni-flow tanks supposed give run prevent lean ing end run give same run inverted typical uni-flow set up looks like Diagram 2 45 Ptskspsb55g,, N LUNO \ DIAGRAM NO 2 UNI-FLO TANK TOP VIEW Some items remember about uni-flow make certain vent tube goes back least 3/g rear wall Most fliers solder vent tube just below alongside pick-up tube Recently some stunters have leaning problems uni-flow tanks didnt have vent tube go back within wall Make other vent tube cap secure doesnt come off flight burn up engine Bevel end pick up tube solder tank wall suction system Muffler pressure now being used both uni-flow suction fuel systems pressure fitting tapped muffler such Fox 90501 4-40 thread size Silicone tubing routed fitting fuel vent tube Proponents muffler pressure claim much steadier run fuel economy less lean ing out end pattern writer has used muffler pressure suction system during 1975 season has quite satisfied resultscontinued page 67 32 Model Aviation Les McDonald took second place 75 Nats Open Stunt poses Stilleto features 56-in foam wing weighs 56 ounces Supertigre 46 power Senior Stunt winners Nats Ito R 2nd place Mark Sullivan 1st place Doug Stout 3rd place Marty Phillips pix Wynn Paul Bright red yellow Sundance Jerry Pil grim has Supertigre 46 engine 59-in wing weight 50 oz Tied 4th Open Nats important using pressure cap off other vent securely during flight engine will lean Out burn up sili cone tubing should wired pressure fitting muffler filling remove silicone tubing tank vent pressure fitting Clunk stunt tanks have small vociferous following swear plastic bottles Glen Alison England uses silicone tubing /z length copper tubing vent pick-up lines Both Jim Lynch Memphis Jim Murphy Metaire La agree clunk tanks run richer inverted inverted engine mount clunkers er spray bar center line Other points remember allow shimming clunk tank adjust run muffler pressure clunk tanks seem work better non-pressure Some stunters have found clunk tanks work better larger size tank used normally needed installing six-ounce tank drawing off fuel re quired five ounces 46 theory behind consistent run will result although writer would think bigger tank would cause sloshing around fuel Try it may work parting writer urges stunters make tanks removable clean very secure mounting Seek advice help knowledgeable stunt flier setting up stunt tank airplane save may own address 1640 Maywick Dr Lexing ton Ky 40504 H ally important HEAD START has achieved lowest reliable idle especially used igh performance engines ipped fuel pressure systems combined 1 large venturi carburetors g life achieved through use wide olution platinum alloy filament PATENT PENDiNG Bantam Model Products has supplied some Americas top competition pilots plugs field test performances results phenomenal proving time time again reliability performance PRIMABLE Squeeze bottle prime through center electrode youre off HEAD START Standard Model $175 ea RIC Model -$200 ea Both Long Short Reach January 197667 4 Kraftsmanship kit processed AAMCO GOLD BALSAThis Trainer will blow apart bits ground GREATEST B/C BASIC TBAINER Design & Kit ALL TIME Ask over 25000 satisfied builders H-BAY dealers sold themSHALL WE SAY MORE Andrews Aircraft Model co Inc US Ete 1& North St Topsfield Mass 01983 887-8541 CL Aerobatics/Paul continued page 32 Price $3495 kit per dollar bar em ne worimable new concept glow plug design permits priming ctly combustion chamber rapid veather starts risk crankcase ding due over choking priming feature dispensable used conjunction fler equipped fully cowled engines glow plug PLACE PATTERN ENDICOTT NY CONTEST PROVEN jST ROSS Schnuerle 61 IDLE Phenomenally low reliable SEE YOUR DEALER IF NOT AVAILABLE ORDER DIRECT ADD 5O outside US $100 FOR POSTAGE AND HANDLING
Edition: Model Aviation - 1976/01
Page Numbers: 32, 67
Control Line Aerobatics THERE ARE FOUR popular systems fuel delivery precision aerobatics suction uni-flow muffler pressure clunk Tank capacity seems pretty standard 35 40 ounces 35 engine 50 55 ounces 46 tank sizes should allow either AMA FAI patterns Unfortunately no manufacturer makes 50 ounce tank Stunt yet although Randys Model Aeronautics formerly Dons Tanks 515 Coleman Blvd Mt Pleasant SC 29464 may have avail able time article published As reminder old Veco tank now known Clary height width two sizing length tank inches equals capacity ounces fore five-in long tank has capacity five ounces Most everyone flies Stunt will revent stock tank using brass copper tubing / K&S soft brass good use because can bent easily copper tubing used must annealed make bend easily Some fliers insert next size smaller tubing vent tube cut down amount air entering tank theory getting too much pressure installing tubing good idea use shortened ice pick awl punch hole tin stock will leave rim metal around hole giving base better solder joint old faithful suction fuel system consists two vents bottom tank top tank writer has good results using 45-degree bevel end vent tubing soldering tubing inside end just touches tank wall necessary solder beveled ends vent tubes tank wall However certain solder beveled end pick-up tube Wynn Paul vent tubes usually placed front tank pick-up tube should extend rear tank 45-degree bevel should either touch rear wall placed 1/32 depending upon choice Both setups have used successfully As has explained times place pickup tube parallel engine bearers directly line spray bar Certainly some have experimented other locations top fliers stick setup usually have consistent runs Most everyone uses some sort baffle suction tank See diagram 1 Some stunters have used two baffles World champion Bill Werwage doesnt use baffle suction sys tem pressure however words world champ Bob Gieseke Cleanli ness next Godliness especially ap plied tanks Sudsy ammonia best tank cleaner Clean good about four six hours before installing plane Flush water alcohol get water out Finally put little fuel prevent rusting DIAGRAM NO 1 SUCTION TANK TOP VIEW uni-flow tank favored fliers including Nationals-placing Gene Schaffer Les McDonald Bill Simons Uni-flow tanks supposed give run prevent lean ing end run give same run inverted typical uni-flow set up looks like Diagram 2 45 Ptskspsb55g,, N LUNO \ DIAGRAM NO 2 UNI-FLO TANK TOP VIEW Some items remember about uni-flow make certain vent tube goes back least 3/g rear wall Most fliers solder vent tube just below alongside pick-up tube Recently some stunters have leaning problems uni-flow tanks didnt have vent tube go back within wall Make other vent tube cap secure doesnt come off flight burn up engine Bevel end pick up tube solder tank wall suction system Muffler pressure now being used both uni-flow suction fuel systems pressure fitting tapped muffler such Fox 90501 4-40 thread size Silicone tubing routed fitting fuel vent tube Proponents muffler pressure claim much steadier run fuel economy less lean ing out end pattern writer has used muffler pressure suction system during 1975 season has quite satisfied resultscontinued page 67 32 Model Aviation Les McDonald took second place 75 Nats Open Stunt poses Stilleto features 56-in foam wing weighs 56 ounces Supertigre 46 power Senior Stunt winners Nats Ito R 2nd place Mark Sullivan 1st place Doug Stout 3rd place Marty Phillips pix Wynn Paul Bright red yellow Sundance Jerry Pil grim has Supertigre 46 engine 59-in wing weight 50 oz Tied 4th Open Nats important using pressure cap off other vent securely during flight engine will lean Out burn up sili cone tubing should wired pressure fitting muffler filling remove silicone tubing tank vent pressure fitting Clunk stunt tanks have small vociferous following swear plastic bottles Glen Alison England uses silicone tubing /z length copper tubing vent pick-up lines Both Jim Lynch Memphis Jim Murphy Metaire La agree clunk tanks run richer inverted inverted engine mount clunkers er spray bar center line Other points remember allow shimming clunk tank adjust run muffler pressure clunk tanks seem work better non-pressure Some stunters have found clunk tanks work better larger size tank used normally needed installing six-ounce tank drawing off fuel re quired five ounces 46 theory behind consistent run will result although writer would think bigger tank would cause sloshing around fuel Try it may work parting writer urges stunters make tanks removable clean very secure mounting Seek advice help knowledgeable stunt flier setting up stunt tank airplane save may own address 1640 Maywick Dr Lexing ton Ky 40504 H ally important HEAD START has achieved lowest reliable idle especially used igh performance engines ipped fuel pressure systems combined 1 large venturi carburetors g life achieved through use wide olution platinum alloy filament PATENT PENDiNG Bantam Model Products has supplied some Americas top competition pilots plugs field test performances results phenomenal proving time time again reliability performance PRIMABLE Squeeze bottle prime through center electrode youre off HEAD START Standard Model $175 ea RIC Model -$200 ea Both Long Short Reach January 197667 4 Kraftsmanship kit processed AAMCO GOLD BALSAThis Trainer will blow apart bits ground GREATEST B/C BASIC TBAINER Design & Kit ALL TIME Ask over 25000 satisfied builders H-BAY dealers sold themSHALL WE SAY MORE Andrews Aircraft Model co Inc US Ete 1& North St Topsfield Mass 01983 887-8541 CL Aerobatics/Paul continued page 32 Price $3495 kit per dollar bar em ne worimable new concept glow plug design permits priming ctly combustion chamber rapid veather starts risk crankcase ding due over choking priming feature dispensable used conjunction fler equipped fully cowled engines glow plug PLACE PATTERN ENDICOTT NY CONTEST PROVEN jST ROSS Schnuerle 61 IDLE Phenomenally low reliable SEE YOUR DEALER IF NOT AVAILABLE ORDER DIRECT ADD 5O outside US $100 FOR POSTAGE AND HANDLING