CONTROL LINE SPEED B EI [ Lieu Golden Elixir latest Speed secret Sounds great doesnt it true such thing Stay tuned Ill tell about time heard story old days late 40s early 50s guy comes running up speedying buddies says Look what got new super fuel buddy grabs can shakes first guy yells Dont shake itll explode Some old saying friends claim true story before time Could can speed fuel explode shaken Speeders always looking hotter powerful fuel Lots exotic sometimes dangerous compoundsany thing would bumwere tried including acetone paint thinner nitropropane nitroethane kinds alcohol oxidizer tried picric acid left yellow stains airplane clothes hands Other nastier acids also tried ate up engines too fast World War II rocket fuels became available really toxic dangerous chemi cals such hydrazine concentrated hydro gen peroxide tetranitromethane really gave some zap fuel Immediately after using some run engine mild fuel flush out remnants exotics otherwise parts engine would damaged dissolved Most liquids readily absorbed through skin damaged liver lungs poisonous humans Some dried left crystals shock sensitive would explode obtained information some German rocket specialists Redstone Arsenal about heavy-metal-containing fuel additives increased power dramatically highly toxic Luckily never could get things didnt damage lungs engines fortunately dangerous compounds quickly wisely banned competition Synthetic high-temperature oils also came out war modelers soon found some soluble nitromethane old fuels used castor oil lubricant would hold up hot engines would also mix methanol will mix nitro have enough alcohol some other chemical dissolve oil mix nitro Things like nitrobenzene nasty carcinogenic used help mix nitro maximum nitro content still limited about 55% advent synthetic hightemperature oils suddenly allowed us mix fuels much nitro dared sometimes much 85% wasnt long before fuels oil usually 20% cared about engine nitro varying amounts propylene oxide depending humidity propylene oxide acted ignitor nitro As much 20% could used dry desert air 2% 10% could used up northern climates hot fuel burned holes piston Steen C first synthetic oil tried worked fine dissolved epoxy paint airplane using Pettits epoxy boat paint now called Hobbypoxy Neat colors available whole quart cost less small can does now Getting back snake oil few weeks less will see Robart ads just such thing different name originally course Bob Walker liked way worked much wanted name sounded impressive really gear transmission additive chemical compound covers metal surfaces bonds extremely high surface tension ad hesion great metal-to-metal contact impossible thus friction wear greatly reduced will available two forms after-run oil fuel additive Will make speed engines go faster doubt since friction light warm model fuel lubricants very low Im certainly going find out helps What will really protect bail bearings excessive wear protect sleeve bearings like crankpin-conrod connec tion reduce wear such other moving metal surfaces rings rotary valves should great after-run oil assembly oil Robart tested adding fuel large fan-jet enginean engine prone conrod failures try peak out maximum rpmby starting engine leaning out needle valve until engine stopped Robart repeated test 10 times damage engine can protect engine under kind abuse must able protect engines prolong useful lifetime Ill trying out soon warms up around Incidentally read about five other model magazines hesitate leam borrow useful information Recently Col Bob Thacker wrote articleI think RCMcalled Belch Fire 77 Care Feeding Fan Engines Now dont have gift gab writing have probably noticed Col Thacker wrote very good complete article something would tell sentence need least 003-inch clearance between crankpin conrod otherwise high rpm will gail engine will destroyed 65 larger engine smaller engines also need plenty clearance think information came Bill Wisniewski experience building K&B speed boat engines Most European Asian engines have enough crankpin clearance very likely blow conrod run lot before flown Its better check clearance before run ning inserting narrow 1/8-inch wide strip tablet paper bearing wont go sand conrod bearing 400- 600-grit sandpaper wrapped around dowel wont require very much go easy paper thickness normally about 003 5 inch learned about sleeve bearing clearances long ago never really thought much about until now Back running sleeve bearing engines such Fox 29X learned have 116 Model Aviation weignt oaisa model aluminum wheels powered Aloise 049 engine fuel tank contained part cigar tube Mike Coutss asymmetrical D Speed job designed minimize aerodynamic drag resulting large-diameter flying lines suffcient clearance bearings engine wouldnt go found necessary clearance 005 inch per /2-inch diameter other words one-inch-diameter bearing would have needed 010-inch clearance between diameters radius same ratio holds pretty true smaller bearings crankpin HotroddinglVantHaaff Continued page 27 Make spacers end pushrod tube -inch aluminum bar stock Face center drill drill out 182 inches deep enough can cut off four 030 spacers could also use copper aluminum brass heavy-wall tubing Almost anything including second 0-ring will job long does cut 0-ring cylinder spacer made one-inch aluminum bar stock turned approximate ly 914 0D convenient bored 802 ID Cut 060 long friend way used drill press entire operation used piece 060 plate cylinder spacer requires little drilling cutting filing can done successfully just takes longer drill press can also act bearing press necessary Reassembly The 26 crank uses collar 20 shaft together slide easily crankcase Tap crank forward brass drift until bottoms out front bearing Support front end against hardwood aluminum block Slide piston cylinder rotate crank until conrod pin bottom slip conrod onto pin Rotate crank TDC top dead center slide 060 shim over cylinder liner until tight underneath flange top Now slide liner carefully over piston push way down engine its left side place ball bottom cam recess insert camshaft pockmark facing out Take care align pockmark previously indi cated line pushrod tubes Place second ball end shaft secure end cover place Replace lifters Remove 0-rings pushrod tubes Slide 030 spacers end replace 0-rings Insert pushrod tubes slip cylinder head align snug four head bolts evenly rotation Insert new pushrods reinstall rocker assembly tappets slacked off Rotate crankshaft check lifter operation TDC compression stroke set valve clearance Replace tappet cover install crankcase end plate carburetor intake tube will notice screw holds intake tube cylinder near carburetor now out alignment Dont worry functions anyway with200-inch diameter should have 002-inch clearance awful close what Col Thacker says Bill Wisniewski says up 006-inch good rattle okay Check conrods may save engine Flying season should have some test flight results next column stall engine aircraft test bed fire up Presto Changeo takes longer tell about does itwell almost initial startup open needle valve about 900 before engine would start ran flawlessly ran tank fuel through engine varying rpm throughout its entire range operation found turned 10200 rpm 9 x 6 prop three-year-old engine has heavily used After engine cooled rechecked bolts found loosened however did have reset valve clearance Note Avoid exceeding manufacturers recommended maximum rpm Bent valves conrods ruined pistons can result Unless change bearings valve job little glass beading spruce up looks unit operation will take about five 15 minutes disassemble engine 15 minutes clean about hour make parts listed above about 40 minutes reassemble whole thing Thats total two hours So allow yourself evenings time ought easily able complete task careful lose small pieces dont spend time talking telephone will have done bedtime extra power get really worth effort engine will really get up go Note spacers addition 060 pushrod length really intended generalizationnumbers average folks can deal readily available sheet stock have lathe home shop machinist follow ing figures may pertinent Since 26s stroke longer 24 mm 0945 spacer needs half 04725 will keep compression up Likewise additional length pushrods bores slightly different two engines 18mm 7087 opposed 185 mm 7283 So displacement bit less approx imately 014 cubic inches Using A6 spacer will drop compression bit will help prevent pre-ignition tendency fanatical purist yes difference wont really have 26 will have noticeably power no appreciable outward modifications aircraft will required modified 20 will now have displacement 254 compared stock 26 268 Enjoy Flying Dutchman IALIST IN CUSTOM COX TEE DEE & REED ENGINES 020S 049S 051S 074S & 09S ALL CUSTOM & STOCK PARTS AVAILABLE INDIVIDUALLY COMPETITION ACCESSORIES RACING WHEELS KLOTZ OIL CARBON FIBER SOLID LINES ALL KINDS OF TUBING THREE BRANDS OF GLOW PLUGS HARD-TO-FIND HARDWARE OLD TIMER SUPPLIES COILS CONDENSERS NGK & STIlT SPARK PLUGS SILK 8 COLORS QUALITY DOPE BRUSHES 5 &7 LOOP 114 RUBBERBANDS TRANSISTOR IGNITION SYSTEMS RESISTOR HIGH TENSION LEADS 1/2A TEXACO PLAYBOY SR KIT 112A TEXACO ENGINES & PARTS RUBBER POWER KITS PROPS TISSUE AND OTHER SUPPLIES CYANOACRYLATES & EPOXIES ORDER BY MAIL OR PHONE 619 728-4365 SORRY NO COD VISA & MASTERCARD WELCOME MINIMUM MERCHANDISE ORDER $1000 SHIPPING HANDLING AND INSURANCE FEE $395 STOCK ORDERS SHIPPED WITHIN 24 HRS September1993 117 uull u1v-ur INVENTORY AVERAGES OVER 9000 PROPSIII IMMEDIATE SHIPMENT VISA/MC ICdDS QUALITY MODEL PRODUCTS 16 Main St Phelps NY 14532 315-548-3779
Edition: Model Aviation - 1993/09
Page Numbers: 116, 117
CONTROL LINE SPEED B EI [ Lieu Golden Elixir latest Speed secret Sounds great doesnt it true such thing Stay tuned Ill tell about time heard story old days late 40s early 50s guy comes running up speedying buddies says Look what got new super fuel buddy grabs can shakes first guy yells Dont shake itll explode Some old saying friends claim true story before time Could can speed fuel explode shaken Speeders always looking hotter powerful fuel Lots exotic sometimes dangerous compoundsany thing would bumwere tried including acetone paint thinner nitropropane nitroethane kinds alcohol oxidizer tried picric acid left yellow stains airplane clothes hands Other nastier acids also tried ate up engines too fast World War II rocket fuels became available really toxic dangerous chemi cals such hydrazine concentrated hydro gen peroxide tetranitromethane really gave some zap fuel Immediately after using some run engine mild fuel flush out remnants exotics otherwise parts engine would damaged dissolved Most liquids readily absorbed through skin damaged liver lungs poisonous humans Some dried left crystals shock sensitive would explode obtained information some German rocket specialists Redstone Arsenal about heavy-metal-containing fuel additives increased power dramatically highly toxic Luckily never could get things didnt damage lungs engines fortunately dangerous compounds quickly wisely banned competition Synthetic high-temperature oils also came out war modelers soon found some soluble nitromethane old fuels used castor oil lubricant would hold up hot engines would also mix methanol will mix nitro have enough alcohol some other chemical dissolve oil mix nitro Things like nitrobenzene nasty carcinogenic used help mix nitro maximum nitro content still limited about 55% advent synthetic hightemperature oils suddenly allowed us mix fuels much nitro dared sometimes much 85% wasnt long before fuels oil usually 20% cared about engine nitro varying amounts propylene oxide depending humidity propylene oxide acted ignitor nitro As much 20% could used dry desert air 2% 10% could used up northern climates hot fuel burned holes piston Steen C first synthetic oil tried worked fine dissolved epoxy paint airplane using Pettits epoxy boat paint now called Hobbypoxy Neat colors available whole quart cost less small can does now Getting back snake oil few weeks less will see Robart ads just such thing different name originally course Bob Walker liked way worked much wanted name sounded impressive really gear transmission additive chemical compound covers metal surfaces bonds extremely high surface tension ad hesion great metal-to-metal contact impossible thus friction wear greatly reduced will available two forms after-run oil fuel additive Will make speed engines go faster doubt since friction light warm model fuel lubricants very low Im certainly going find out helps What will really protect bail bearings excessive wear protect sleeve bearings like crankpin-conrod connec tion reduce wear such other moving metal surfaces rings rotary valves should great after-run oil assembly oil Robart tested adding fuel large fan-jet enginean engine prone conrod failures try peak out maximum rpmby starting engine leaning out needle valve until engine stopped Robart repeated test 10 times damage engine can protect engine under kind abuse must able protect engines prolong useful lifetime Ill trying out soon warms up around Incidentally read about five other model magazines hesitate leam borrow useful information Recently Col Bob Thacker wrote articleI think RCMcalled Belch Fire 77 Care Feeding Fan Engines Now dont have gift gab writing have probably noticed Col Thacker wrote very good complete article something would tell sentence need least 003-inch clearance between crankpin conrod otherwise high rpm will gail engine will destroyed 65 larger engine smaller engines also need plenty clearance think information came Bill Wisniewski experience building K&B speed boat engines Most European Asian engines have enough crankpin clearance very likely blow conrod run lot before flown Its better check clearance before run ning inserting narrow 1/8-inch wide strip tablet paper bearing wont go sand conrod bearing 400- 600-grit sandpaper wrapped around dowel wont require very much go easy paper thickness normally about 003 5 inch learned about sleeve bearing clearances long ago never really thought much about until now Back running sleeve bearing engines such Fox 29X learned have 116 Model Aviation weignt oaisa model aluminum wheels powered Aloise 049 engine fuel tank contained part cigar tube Mike Coutss asymmetrical D Speed job designed minimize aerodynamic drag resulting large-diameter flying lines suffcient clearance bearings engine wouldnt go found necessary clearance 005 inch per /2-inch diameter other words one-inch-diameter bearing would have needed 010-inch clearance between diameters radius same ratio holds pretty true smaller bearings crankpin HotroddinglVantHaaff Continued page 27 Make spacers end pushrod tube -inch aluminum bar stock Face center drill drill out 182 inches deep enough can cut off four 030 spacers could also use copper aluminum brass heavy-wall tubing Almost anything including second 0-ring will job long does cut 0-ring cylinder spacer made one-inch aluminum bar stock turned approximate ly 914 0D convenient bored 802 ID Cut 060 long friend way used drill press entire operation used piece 060 plate cylinder spacer requires little drilling cutting filing can done successfully just takes longer drill press can also act bearing press necessary Reassembly The 26 crank uses collar 20 shaft together slide easily crankcase Tap crank forward brass drift until bottoms out front bearing Support front end against hardwood aluminum block Slide piston cylinder rotate crank until conrod pin bottom slip conrod onto pin Rotate crank TDC top dead center slide 060 shim over cylinder liner until tight underneath flange top Now slide liner carefully over piston push way down engine its left side place ball bottom cam recess insert camshaft pockmark facing out Take care align pockmark previously indi cated line pushrod tubes Place second ball end shaft secure end cover place Replace lifters Remove 0-rings pushrod tubes Slide 030 spacers end replace 0-rings Insert pushrod tubes slip cylinder head align snug four head bolts evenly rotation Insert new pushrods reinstall rocker assembly tappets slacked off Rotate crankshaft check lifter operation TDC compression stroke set valve clearance Replace tappet cover install crankcase end plate carburetor intake tube will notice screw holds intake tube cylinder near carburetor now out alignment Dont worry functions anyway with200-inch diameter should have 002-inch clearance awful close what Col Thacker says Bill Wisniewski says up 006-inch good rattle okay Check conrods may save engine Flying season should have some test flight results next column stall engine aircraft test bed fire up Presto Changeo takes longer tell about does itwell almost initial startup open needle valve about 900 before engine would start ran flawlessly ran tank fuel through engine varying rpm throughout its entire range operation found turned 10200 rpm 9 x 6 prop three-year-old engine has heavily used After engine cooled rechecked bolts found loosened however did have reset valve clearance Note Avoid exceeding manufacturers recommended maximum rpm Bent valves conrods ruined pistons can result Unless change bearings valve job little glass beading spruce up looks unit operation will take about five 15 minutes disassemble engine 15 minutes clean about hour make parts listed above about 40 minutes reassemble whole thing Thats total two hours So allow yourself evenings time ought easily able complete task careful lose small pieces dont spend time talking telephone will have done bedtime extra power get really worth effort engine will really get up go Note spacers addition 060 pushrod length really intended generalizationnumbers average folks can deal readily available sheet stock have lathe home shop machinist follow ing figures may pertinent Since 26s stroke longer 24 mm 0945 spacer needs half 04725 will keep compression up Likewise additional length pushrods bores slightly different two engines 18mm 7087 opposed 185 mm 7283 So displacement bit less approx imately 014 cubic inches Using A6 spacer will drop compression bit will help prevent pre-ignition tendency fanatical purist yes difference wont really have 26 will have noticeably power no appreciable outward modifications aircraft will required modified 20 will now have displacement 254 compared stock 26 268 Enjoy Flying Dutchman IALIST IN CUSTOM COX TEE DEE & REED ENGINES 020S 049S 051S 074S & 09S ALL CUSTOM & STOCK PARTS AVAILABLE INDIVIDUALLY COMPETITION ACCESSORIES RACING WHEELS KLOTZ OIL CARBON FIBER SOLID LINES ALL KINDS OF TUBING THREE BRANDS OF GLOW PLUGS HARD-TO-FIND HARDWARE OLD TIMER SUPPLIES COILS CONDENSERS NGK & STIlT SPARK PLUGS SILK 8 COLORS QUALITY DOPE BRUSHES 5 &7 LOOP 114 RUBBERBANDS TRANSISTOR IGNITION SYSTEMS RESISTOR HIGH TENSION LEADS 1/2A TEXACO PLAYBOY SR KIT 112A TEXACO ENGINES & PARTS RUBBER POWER KITS PROPS TISSUE AND OTHER SUPPLIES CYANOACRYLATES & EPOXIES ORDER BY MAIL OR PHONE 619 728-4365 SORRY NO COD VISA & MASTERCARD WELCOME MINIMUM MERCHANDISE ORDER $1000 SHIPPING HANDLING AND INSURANCE FEE $395 STOCK ORDERS SHIPPED WITHIN 24 HRS September1993 117 uull u1v-ur INVENTORY AVERAGES OVER 9000 PROPSIII IMMEDIATE SHIPMENT VISA/MC ICdDS QUALITY MODEL PRODUCTS 16 Main St Phelps NY 14532 315-548-3779