The Engine Shop

U Joe Wagner ffUzi zr iiIxjp SEVERAL READERS have written about engine intake extensions mentioned column few months ago Some wanted specific information long Whats best length can buy similar questions Heres subject intake extensions Length Make long possible within reason Extending length four five times inlets inside diameter makes noticeable improvement twostroke model engines might further improve performance added gain wont great Source As far know nobody sells model engine intake extensions too variables involved interest accessory manufacturer putting product like market Its do-ityourself project Jim Correll New Albany IN makes intake extensions K&S brass tubing various sizes have same wall thickness fit snugly telescope style produce combination inside outside diameters want Jim sweatsolders together lengths tubing makes extensions shapes entry end required provide smooth trumpet-shaped inlet passage Epoxy might also work Jerry Price Walsenburg CO has intake extensions made bar-stock aluminum small machine shop custom-machined parts dont cost much getting made professionally saves Jerry time uses other modeling activities item makes significant difference reliability model engine performance position fuel orifice intake passage As general rule fuel suction atomization maximized orifice center inlet passage Inlet designs eliminate airflow obstruction traditional needle valve spraybar middle intake path paying penalty requiring pressurized fuel feed reliable engine performance As spraybar type needle valve very best arrangement twin-fuel36 Model Aviation Tee Dee 010s touchy adjustments due its poor fuel orifice location its exceptionally tiny size geared-down glow engine drive worked Bob Kresss G-Mark 30 really five 061s mounted within single case highly modified Pee Wee 020 units sold geared central propeller drive shaft orifice design such used PAW diesels Fox Control Line engines examine spraybar power plants closely youll notice holes arent straight across another Thats manufacturing defect Its purpose allow positioning spraybar both holes just slightly downstream straight-across-theventuri position maximizes fuel suction spraybar single hole often helps performance carefully handdrill bit held pin vise same-size hole straight across spraybar provide double orifice advantage minimizes adverse effect eccentricity needle point taper However want stay factory configuration single fuel orifice spraybar best position pointing toward rear wall intake passage about five degrees downstream straight-across-thepassage orientation some engine manufacturers aim fuel orifices needle valve assemblies straight downstream theory doing helps fuel atomization because moving airstream behind spraybar turbulent However though considerable Robart Gear features compact design tougher lighter weight oth retracts Pneumatic Mechanical Retracts mid-size models Retract Angles 7008509001 Forward thrust Nosegear Supported full line T Robotrut straight and complete Robart P Air Control Systems Backed Over 25 ve famous Robart F 38 Model Aviation fIat four made mostly Cox ORC Tee Dee 049 Another attempt gear-drive glow engine ones mostly components Designed commercial sale didnt succeed pair Cox Medallion 09s Cylinders fire simultaneously turbulence behind model engines spraybar thats negligible compared whats happening inside crankcase comparative tests Jerry Price Frank Williams other experimenters have demonstrated beyond doubt theres no power loss sideways-looking spraybar fuel orifice noticeable improvement running reliability E-mail correspondents flies mostly Electric-powered RC asked recently wet-power fliers dont gear down engines take advantage big gain thrust output geared-down Electric motors noted answers easy Geared two-stroke model engines have often tried dont stand up well service Electric motors provide essentially uniform torque running gear teeth equally stressed twostroke engine provides its power series impulses tooth gear crankshaft thats entering mesh engines piston starts downward stroke takes tremendous punishment No matter teeth cfriven gear single driver tooth has absorb sudden shock power impulse No wonder gear-drive model engines have never proven successful Years ago Bob Kress Kress Jets man marketed gear-reduction version Cox Pee Wee 020 worked very well too Bob long-experienced 4-40x1/2 socket caps sell S435/1 00 alloy steel S665/1 00 stainless S750/50 aluminum fair prices sensible quantities fas teners need model building call write fax free catalog Micro Fasteners800-892-6917 110 Hillcrest Road908-806-4050 Flemington NJ 08822fax 908-7882607 email micref@blaeinet Internethttp//microfasfenerswm 40 Model Aviation Sky Harbor RC Presents Mike Del Pontes Reviution V-Tail 12-500 Fits 40 size motors Handcrafted custom ARC Lightweight pre-built fuse piece sheeted wing epoxy carbon fiber reinforc log Predictable racing plane yet stable asd docile sport plane Building set up details incleded $135 ping Imitations Only Revlution p-5l Refl0 Series Modified Brochureit Kit Free ColorEasy BUI ARC Kit $325 Scale Outline ize a & Plywood Construction ize designed ton YS 91 40 Wing Coreu r Canopy pbs ABS cowl Scoop Eshauct Build Kit ARC Kit ges Rolled Plans ls Available le Racing/Sport Plane e Warbird Racing Association Chawpion Corn plted airplanes covered monokoCe also availaSle Sky Harbor RC Phoenix AZ USA 976-6341 wwwinficadcom/skyharrc UDennis & Dorinda ThomasZ UfltPl IV 4338 Austin Blvd Island Park NY 11558 CANOPIESI 516/431-4127 Fax 516/885-2682 oJrOlalole 5 5000 ra oiler syolero & Iran oil rw 01 xceo sores ratS era annoor o nero Call Ian 110015 o pIn n coo noel noose pool ire calolop Rubber ft Engine Power Free Flight Diepley Control Line Electric Power RIC Airpienee Peern Valley Hobby Center 837-A W Main St Lanadale PA 19446 215- 3U-O77l Champions Choice Worlds Finest & Fastest Racing Engines have trophies prove Versions Sport & Competition Available Sizes 15 50 Only Way Win Serious Horsepower Upgrade Sport Engines Up 1500 RPM Increase Over Stock Muffler available 60 size Models fit OS 32 Webra 32 ST G 34 05 40/46 SF 05 46 FX ASP 45 Magnum XL 40/46/53 Thunder Tiger Pro 40/45 ST GS 40/45/51 Webra 40/50 MWS 40 Rossi 40/45/53 Complete Engine/Mottler Combos Availablo Applicafion Engine Included Sport Racing Free-Flight Electrics 4 Diameter Replaceable 0-Ring Tire 1 per Pair l Avies Avsilable dyed ta chsice colsr True Chrome Plating oved Porting ng Options Sizes fa Fit Most YS sod OS Engines 45 106 Application Backplate Mounting System Barofock Aluminum Replaces Stock Backplate ng Seal roublesnme Gaskefo Available ST 40/45/51 Rossi 40/45 Webrs 40/50 05 40/46 SF YS 45 Thander Tiger Pro 40/46/53 Magnum XL 40/46/53 Ultra Oil Preservative After-Run Oil tsr Model Engines y Compatible OS/YS Pump Systems s Prevent Rust & Corrosion Others Have Fsiled lable 3 Cnnvenient Sizes 8 oz Ovart Gallon Pylon Racing Parts & Accessories OS Super Tiger YS Repair Service Send $300 1998 Catalog Dealer Inquiries Welcome PERFORMANCE SPECIALTI ES P 0 Box 3145 nerville NV 89410 Phone 702-255-7523 702-255-7522 E-mail perfspec@acinet aeronautical engineer solved drive-gear failure problem insEalling flywheel Pee Wees shaft absorbed Ehe power stroke shocks nicely However mass flywheel plus other components gear drive just about tripled total weight power plant installation Some years ago Du-Bro manufactured reduction gear unit model engines device solved overstressed gear tooth problem using flywheel toothed timing belt drive Designed permit powering Giant-sized RC airplanes 60-size two-stroke glow engines Du Bros Prop Drive Unit never became popular bulky heavy cost about same engines designed use couple decades ago few model engine manufacturers experimented gear drives way making multicylinder versions single-cylinder types general idea combine number separate two-stroke power units single package crankshaft geared central propeller drive shaft Only multicylinder projects produced commercial quantities C-Mark 30 five-cylinder combination used cylinders pistons etc well-proven C-Mark 061 Quite few attractive fivecylinder engines made sold appears ended up display items model engine collections Ive never seen run let alone installed airplane anyone has used CMark 5 power flying model please write E-mail about Other attempts gearing together several individual two-stroke power units made much use Cox components ingenious attempt Flat Four combined mostly stock parts QRC Tee Dee 049s 25-to-I reduction gearing never saw engines running either did run Ive assured could exhaust note must have impressive indeed set up 900 firing prop shaft speed 5000 rpm would 50000 power impulses minute Ive also seen handled Cox 19 Twin made pair Medallion 09s As recall used gearing close 11 actually used power RC airplane However apparently prototype never put model hobby market may have suffered drive-gear breakage no provisions Kress unit did absorbing power impulse loads via flywheel mentioned problem area another model flier gave puzzled look asked doesnt propeller act flywheel model airplane engines Certainly does gear-drive configuration prop mounted driven shaft makes stress single drive gear tooth absorbs power impulse greater tooth must fight normal torque load spinning propeller also inertia load keeping flywheel energy reasonably constant Now little-known quite-important factor model engine performance cylinder hold-down screw tightness illustrate affects model engine power output Ill tell first learned about helping Johnny Brodbeck Dan Lutz K&B Engine Repair Station 1959 Nationals Dan fixed crashdamaged Creenhead 15 put test stand check out Once got little K&B running Johnny picked up stroboscope adjusted stop engines prop So far nothing new en procedure days years before transistorized optical tachometers stroboscope way check rpm Dan took screwdriver engine continued run slowly adjusted tightness of three long screws held down cylinder flashing light strobe effect showed plainly As Dan tweaked 42 Model Aviation Built Fuse est Grade Bals& Pre-Sheeted Tail Sections Aluminum Wing & Toil Tubes Detailed Instruction Manual y Glass Cowl & Wheel Pants Sheeted WinqslitePly&Balsa Conut Turtle Deck & Hutch Removable Tail Stab inum Gear r Canopy 6-202 has chines tOC flyen fur outstanding flight ahasoctedshcs bsth Ike IltaC end hue style evens hs sleek funelote lnng tail osoent sake tsr vosy smooth stable tyns Also Available 33% Laser 200120 Extra 300 36% Edge 54037% 300L 25% Edge 5401/4 Scale Extra 120 Ultimate 300 Profile Hendbuih Munokote evened Hand Painted Fihorlmt Purfe S35t 12t Size Exha 3tt 2t Site tifunete ming pen no s eree Luos sq ns L LO Ion ore Jv us us toss uji ero1922 S Hannibal Ct Unit 0 Aurora CO 80013 AWk Ph 303 367-9792 755-5826 ZFax 303-306-1141 WORLD cixu AIRCRAFT screw settings couldsee prop move rotated backward Dan tightened loosened screw until prop either stood still again began rotating forward Whenever Dans adjustment made props image strobe light spin forward Johnny reset strobes speed make prop stand still again Dan repeated adjustments until no further improvement occurred way took couple minutes Johnny Dan set Greenhead 15 up maximum performance asked Johnny what could cause speed variation merely tightening loosening cylinder screws told improper screw tension pulled cylinder slightly out alignment causing piston bind little wasnt muchpossibly two thousandths inch enough slow engine make wear out faster besides happened nearly 40 years ago same situation holds true today Any model engine cylinder held its crankcase screws also retain head can have its performance degraded improper screw tightening Unfortunately strobo-tachometers difficult find now might think digital tachometer could used set optimum operational tightness cylinder retaining screws However digital tachs Ive tried dont hold particularly steady readings last couple digits often change randomlyso irregularly dont think could detect small speed variations show plainly fast-flickering light strobe gently adjust screw tightness What reassembling model engine cylinder hold-down screws such larger PAW diesels go feel As snug down retaining screws flip prop frequently compression screw backed way off cylinder well-oiled 3inOneTM way tendency piston drag easy detectand correct tes Kirk Cray excellent CIQVSupplylflC148sperformance A2BIA 1st Place FHS er SC 803 Jail World Winners ________ionshas ______Champ AMA Air NationalsUsing spaceage lubrication tec nology op 1997 112A CombatFHS Oil Bob Mearsquality components developed refined over 1996 FAI Pattern Kirk Gray28 years experience RED MAX fuels 1996 Sportsman Randy Wolfespecially engineered Maximum Performance IMAC Scale Aerobatic NationalsPower Protection RED MAX known 1997 Sportsman Michael Kupersold internationally best fuel can IRCHA Helicopter Internationalsuse model engine Fuel model types available planes helicopters boats cars -- racing pattern just fun 1997 10cc TopSpeed Bruce Bennett 1997 10cc TimeToClib Bruce Bennett NAMBA Boat Nationals 1996 A-OPC 36cc Mod Tun Joe Monohan 1996 B-OPC 75cc Mod Tun Don Hirami 1996 C-OPC 11cc Mod Tun Mike McKabney 1996 C-OPC 11cc Stock Tun Joe Monohan Numerous awards year FHS Supply lncPO Box 9CloverSC 2971 0-0009 Sales800 742-8484 Voice 803 222-7488 Internet FHSoilaolcom Fax803 222-7285 httpIlmembersaolcomlFHSoillRedMaxhtml LEEZ Engine types 2 4 cycle Glow Diesel Nitro Power blends 0% 75% 5% Oil blends RED MAX Synthetic Syn-Cas Blend Customer special blends available~ Minimum gal Standard 4-gal 20-qt Cases Shipping UPS door 12 gal motorfreight commercial address Price breaks 412 20 60 124 gal Special discount prepaid club orders RED MAX Shirts Hats & Stickers available & czIraz 4%1 YOUJ PC Vimyl Caller aud Seliga YOUR 7YESIN 30 lOLL STOCK awrsoirciiicsSYSTEM 1047 W dli StPhone 800 736-4048 Corona CA 91720Fax 909 737-0682 YOUR WAY U COLORS ce SA12 $995 LAS $795 C W3 G45 hobbies hOME OF ThE ChA05 KILLER CHAOS 60 size..$7995 UTTER CHAOS 60 size 5 NEW.40 size Miss CHAOS.$6500 NEW.80 Super CHAOS $15995 FREE CATALOG Pt little CHAO5 life c1all ob Lisa G45 1-800-628-6065 520-758-1100 July1998 43

U Joe Wagner ffUzi zr iiIxjp SEVERAL READERS have written about engine intake extensions mentioned column few months ago Some wanted specific information long Whats best length can buy similar questions Heres subject intake extensions Length Make long possible within reason Extending length four five times inlets inside diameter makes noticeable improvement twostroke model engines might further improve performance added gain wont great Source As far know nobody sells model engine intake extensions too variables involved interest accessory manufacturer putting product like market Its do-ityourself project Jim Correll New Albany IN makes intake extensions K&S brass tubing various sizes have same wall thickness fit snugly telescope style produce combination inside outside diameters want Jim sweatsolders together lengths tubing makes extensions shapes entry end required provide smooth trumpet-shaped inlet passage Epoxy might also work Jerry Price Walsenburg CO has intake extensions made bar-stock aluminum small machine shop custom-machined parts dont cost much getting made professionally saves Jerry time uses other modeling activities item makes significant difference reliability model engine performance position fuel orifice intake passage As general rule fuel suction atomization maximized orifice center inlet passage Inlet designs eliminate airflow obstruction traditional needle valve spraybar middle intake path paying penalty requiring pressurized fuel feed reliable engine performance As spraybar type needle valve very best arrangement twin-fuel36 Model Aviation Tee Dee 010s touchy adjustments due its poor fuel orifice location its exceptionally tiny size geared-down glow engine drive worked Bob Kresss G-Mark 30 really five 061s mounted within single case highly modified Pee Wee 020 units sold geared central propeller drive shaft orifice design such used PAW diesels Fox Control Line engines examine spraybar power plants closely youll notice holes arent straight across another Thats manufacturing defect Its purpose allow positioning spraybar both holes just slightly downstream straight-across-theventuri position maximizes fuel suction spraybar single hole often helps performance carefully handdrill bit held pin vise same-size hole straight across spraybar provide double orifice advantage minimizes adverse effect eccentricity needle point taper However want stay factory configuration single fuel orifice spraybar best position pointing toward rear wall intake passage about five degrees downstream straight-across-thepassage orientation some engine manufacturers aim fuel orifices needle valve assemblies straight downstream theory doing helps fuel atomization because moving airstream behind spraybar turbulent However though considerable Robart Gear features compact design tougher lighter weight oth retracts Pneumatic Mechanical Retracts mid-size models Retract Angles 7008509001 Forward thrust Nosegear Supported full line T Robotrut straight and complete Robart P Air Control Systems Backed Over 25 ve famous Robart F 38 Model Aviation fIat four made mostly Cox ORC Tee Dee 049 Another attempt gear-drive glow engine ones mostly components Designed commercial sale didnt succeed pair Cox Medallion 09s Cylinders fire simultaneously turbulence behind model engines spraybar thats negligible compared whats happening inside crankcase comparative tests Jerry Price Frank Williams other experimenters have demonstrated beyond doubt theres no power loss sideways-looking spraybar fuel orifice noticeable improvement running reliability E-mail correspondents flies mostly Electric-powered RC asked recently wet-power fliers dont gear down engines take advantage big gain thrust output geared-down Electric motors noted answers easy Geared two-stroke model engines have often tried dont stand up well service Electric motors provide essentially uniform torque running gear teeth equally stressed twostroke engine provides its power series impulses tooth gear crankshaft thats entering mesh engines piston starts downward stroke takes tremendous punishment No matter teeth cfriven gear single driver tooth has absorb sudden shock power impulse No wonder gear-drive model engines have never proven successful Years ago Bob Kress Kress Jets man marketed gear-reduction version Cox Pee Wee 020 worked very well too Bob long-experienced 4-40x1/2 socket caps sell S435/1 00 alloy steel S665/1 00 stainless S750/50 aluminum fair prices sensible quantities fas teners need model building call write fax free catalog Micro Fasteners800-892-6917 110 Hillcrest Road908-806-4050 Flemington NJ 08822fax 908-7882607 email micref@blaeinet Internethttp//microfasfenerswm 40 Model Aviation Sky Harbor RC Presents Mike Del Pontes Reviution V-Tail 12-500 Fits 40 size motors Handcrafted custom ARC Lightweight pre-built fuse piece sheeted wing epoxy carbon fiber reinforc log Predictable racing plane yet stable asd docile sport plane Building set up details incleded $135 ping Imitations Only Revlution p-5l Refl0 Series Modified Brochureit Kit Free ColorEasy BUI ARC Kit $325 Scale Outline ize a & Plywood Construction ize designed ton YS 91 40 Wing Coreu r Canopy pbs ABS cowl Scoop Eshauct Build Kit ARC Kit ges Rolled Plans ls Available le Racing/Sport Plane e Warbird Racing Association Chawpion Corn plted airplanes covered monokoCe also availaSle Sky Harbor RC Phoenix AZ USA 976-6341 wwwinficadcom/skyharrc UDennis & Dorinda ThomasZ UfltPl IV 4338 Austin Blvd Island Park NY 11558 CANOPIESI 516/431-4127 Fax 516/885-2682 oJrOlalole 5 5000 ra oiler syolero & Iran oil rw 01 xceo sores ratS era annoor o nero Call Ian 110015 o pIn n coo noel noose pool ire calolop Rubber ft Engine Power Free Flight Diepley Control Line Electric Power RIC Airpienee Peern Valley Hobby Center 837-A W Main St Lanadale PA 19446 215- 3U-O77l Champions Choice Worlds Finest & Fastest Racing Engines have trophies prove Versions Sport & Competition Available Sizes 15 50 Only Way Win Serious Horsepower Upgrade Sport Engines Up 1500 RPM Increase Over Stock Muffler available 60 size Models fit OS 32 Webra 32 ST G 34 05 40/46 SF 05 46 FX ASP 45 Magnum XL 40/46/53 Thunder Tiger Pro 40/45 ST GS 40/45/51 Webra 40/50 MWS 40 Rossi 40/45/53 Complete Engine/Mottler Combos Availablo Applicafion Engine Included Sport Racing Free-Flight Electrics 4 Diameter Replaceable 0-Ring Tire 1 per Pair l Avies Avsilable dyed ta chsice colsr True Chrome Plating oved Porting ng Options Sizes fa Fit Most YS sod OS Engines 45 106 Application Backplate Mounting System Barofock Aluminum Replaces Stock Backplate ng Seal roublesnme Gaskefo Available ST 40/45/51 Rossi 40/45 Webrs 40/50 05 40/46 SF YS 45 Thander Tiger Pro 40/46/53 Magnum XL 40/46/53 Ultra Oil Preservative After-Run Oil tsr Model Engines y Compatible OS/YS Pump Systems s Prevent Rust & Corrosion Others Have Fsiled lable 3 Cnnvenient Sizes 8 oz Ovart Gallon Pylon Racing Parts & Accessories OS Super Tiger YS Repair Service Send $300 1998 Catalog Dealer Inquiries Welcome PERFORMANCE SPECIALTI ES P 0 Box 3145 nerville NV 89410 Phone 702-255-7523 702-255-7522 E-mail perfspec@acinet aeronautical engineer solved drive-gear failure problem insEalling flywheel Pee Wees shaft absorbed Ehe power stroke shocks nicely However mass flywheel plus other components gear drive just about tripled total weight power plant installation Some years ago Du-Bro manufactured reduction gear unit model engines device solved overstressed gear tooth problem using flywheel toothed timing belt drive Designed permit powering Giant-sized RC airplanes 60-size two-stroke glow engines Du Bros Prop Drive Unit never became popular bulky heavy cost about same engines designed use couple decades ago few model engine manufacturers experimented gear drives way making multicylinder versions single-cylinder types general idea combine number separate two-stroke power units single package crankshaft geared central propeller drive shaft Only multicylinder projects produced commercial quantities C-Mark 30 five-cylinder combination used cylinders pistons etc well-proven C-Mark 061 Quite few attractive fivecylinder engines made sold appears ended up display items model engine collections Ive never seen run let alone installed airplane anyone has used CMark 5 power flying model please write E-mail about Other attempts gearing together several individual two-stroke power units made much use Cox components ingenious attempt Flat Four combined mostly stock parts QRC Tee Dee 049s 25-to-I reduction gearing never saw engines running either did run Ive assured could exhaust note must have impressive indeed set up 900 firing prop shaft speed 5000 rpm would 50000 power impulses minute Ive also seen handled Cox 19 Twin made pair Medallion 09s As recall used gearing close 11 actually used power RC airplane However apparently prototype never put model hobby market may have suffered drive-gear breakage no provisions Kress unit did absorbing power impulse loads via flywheel mentioned problem area another model flier gave puzzled look asked doesnt propeller act flywheel model airplane engines Certainly does gear-drive configuration prop mounted driven shaft makes stress single drive gear tooth absorbs power impulse greater tooth must fight normal torque load spinning propeller also inertia load keeping flywheel energy reasonably constant Now little-known quite-important factor model engine performance cylinder hold-down screw tightness illustrate affects model engine power output Ill tell first learned about helping Johnny Brodbeck Dan Lutz K&B Engine Repair Station 1959 Nationals Dan fixed crashdamaged Creenhead 15 put test stand check out Once got little K&B running Johnny picked up stroboscope adjusted stop engines prop So far nothing new en procedure days years before transistorized optical tachometers stroboscope way check rpm Dan took screwdriver engine continued run slowly adjusted tightness of three long screws held down cylinder flashing light strobe effect showed plainly As Dan tweaked 42 Model Aviation Built Fuse est Grade Bals& Pre-Sheeted Tail Sections Aluminum Wing & Toil Tubes Detailed Instruction Manual y Glass Cowl & Wheel Pants Sheeted WinqslitePly&Balsa Conut Turtle Deck & Hutch Removable Tail Stab inum Gear r Canopy 6-202 has chines tOC flyen fur outstanding flight ahasoctedshcs bsth Ike IltaC end hue style evens hs sleek funelote lnng tail osoent sake tsr vosy smooth stable tyns Also Available 33% Laser 200120 Extra 300 36% Edge 54037% 300L 25% Edge 5401/4 Scale Extra 120 Ultimate 300 Profile Hendbuih Munokote evened Hand Painted Fihorlmt Purfe S35t 12t Size Exha 3tt 2t Site tifunete ming pen no s eree Luos sq ns L LO Ion ore Jv us us toss uji ero1922 S Hannibal Ct Unit 0 Aurora CO 80013 AWk Ph 303 367-9792 755-5826 ZFax 303-306-1141 WORLD cixu AIRCRAFT screw settings couldsee prop move rotated backward Dan tightened loosened screw until prop either stood still again began rotating forward Whenever Dans adjustment made props image strobe light spin forward Johnny reset strobes speed make prop stand still again Dan repeated adjustments until no further improvement occurred way took couple minutes Johnny Dan set Greenhead 15 up maximum performance asked Johnny what could cause speed variation merely tightening loosening cylinder screws told improper screw tension pulled cylinder slightly out alignment causing piston bind little wasnt muchpossibly two thousandths inch enough slow engine make wear out faster besides happened nearly 40 years ago same situation holds true today Any model engine cylinder held its crankcase screws also retain head can have its performance degraded improper screw tightening Unfortunately strobo-tachometers difficult find now might think digital tachometer could used set optimum operational tightness cylinder retaining screws However digital tachs Ive tried dont hold particularly steady readings last couple digits often change randomlyso irregularly dont think could detect small speed variations show plainly fast-flickering light strobe gently adjust screw tightness What reassembling model engine cylinder hold-down screws such larger PAW diesels go feel As snug down retaining screws flip prop frequently compression screw backed way off cylinder well-oiled 3inOneTM way tendency piston drag easy detectand correct tes Kirk Cray excellent CIQVSupplylflC148sperformance A2BIA 1st Place FHS er SC 803 Jail World Winners ________ionshas ______Champ AMA Air NationalsUsing spaceage lubrication tec nology op 1997 112A CombatFHS Oil Bob Mearsquality components developed refined over 1996 FAI Pattern Kirk Gray28 years experience RED MAX fuels 1996 Sportsman Randy Wolfespecially engineered Maximum Performance IMAC Scale Aerobatic NationalsPower Protection RED MAX known 1997 Sportsman Michael Kupersold internationally best fuel can IRCHA Helicopter Internationalsuse model engine Fuel model types available planes helicopters boats cars -- racing pattern just fun 1997 10cc TopSpeed Bruce Bennett 1997 10cc TimeToClib Bruce Bennett NAMBA Boat Nationals 1996 A-OPC 36cc Mod Tun Joe Monohan 1996 B-OPC 75cc Mod Tun Don Hirami 1996 C-OPC 11cc Mod Tun Mike McKabney 1996 C-OPC 11cc Stock Tun Joe Monohan Numerous awards year FHS Supply lncPO Box 9CloverSC 2971 0-0009 Sales800 742-8484 Voice 803 222-7488 Internet FHSoilaolcom Fax803 222-7285 httpIlmembersaolcomlFHSoillRedMaxhtml LEEZ Engine types 2 4 cycle Glow Diesel Nitro Power blends 0% 75% 5% Oil blends RED MAX Synthetic Syn-Cas Blend Customer special blends available~ Minimum gal Standard 4-gal 20-qt Cases Shipping UPS door 12 gal motorfreight commercial address Price breaks 412 20 60 124 gal Special discount prepaid club orders RED MAX Shirts Hats & Stickers available & czIraz 4%1 YOUJ PC Vimyl Caller aud Seliga YOUR 7YESIN 30 lOLL STOCK awrsoirciiicsSYSTEM 1047 W dli StPhone 800 736-4048 Corona CA 91720Fax 909 737-0682 YOUR WAY U COLORS ce SA12 $995 LAS $795 C W3 G45 hobbies hOME OF ThE ChA05 KILLER CHAOS 60 size..$7995 UTTER CHAOS 60 size 5 NEW.40 size Miss CHAOS.$6500 NEW.80 Super CHAOS $15995 FREE CATALOG Pt little CHAO5 life c1all ob Lisa G45 1-800-628-6065 520-758-1100 July1998 43