U Joe Wagner MISCELLANY MONTH Theres new address head column recent move Alabama will allow considerably model flying now western Pennsylvanias weather permitted last few years Ill also able experiment model engines have some truly unusual engine developments complete test write about Engine Shop Several readers have written discuss topics mentioned previous columns two-stroke/four-stroke comparison stated effective displacement twostroke engines has always wrongly specified Thats because mathematical formula geometric piston displacement neglects inactive part stroke between Bottom Dead Center BDC point piston crown passes top edge exhaust ports received two dissenting letters about Neither came model engine manufacturer however nor renowned expert such Clarence Lee Bill Wisniewski George Aldrich have worked years development testing model airplane engines know experience about port timing ill effects excessive exhaust port height Anyone still feels geometric piston displacement two-stroke engine what determines its power output regardless its exhaust port dimensionsmight try reworking sleeve typical two-stroke glow engine grinding its exhaust ports higher Ill guarantee no power gain will result point neglected mention explanation four-stroke model airplane engine can put out essentially same useful propulsive power twostroke same nominal size despite fact provides half power strokes given rpm Besides corrected displacement factor just mentioned some two-stroke engines gross energy output has expended compressing fresh fuel/oil/air mixture its crankcase time its piston drives downward energy contributes nothing toward rotating propeller Two letters about column lubrication model engines repeated groundless rumor thats circulating among model fliers several months todays castor oil being produced solvent extraction process makes oil useless model fuel lubricant Castor oil being used American model fuel producers today works just well always has does produce insoluble wax flakes clog needle valve orifices nor other detrimental effect insoluble castor oil rumor false could model fuel blender hope stay business sold product made customers engines unrunnable 52 Model Aviation ese-made Silver Swallow 15 makes great CL power plant available Carlson Engine Imports Authors sixth attempt convert reed-valve Cox QRC 049 glow engine dieselthe crank web failed time Two PAW diesels best handbook model diesel operation Note tiny unobtrusive mufflerstypical PAW Another recurring question about castor oil concerns medicinal vs laxative-grade Medicinal castor oil works just well model engine lubrication other type difference laxative-grade castor oil costs because its pressed special variety castor bean mild flavor Model Diesel Engines Since end WW II diesels have extremely popular Europe type enginepowered model airplane flying until recently diesels never appealed much American model fliers possible reason poor reputation first US-made model diesels Drone 29 Mite 098 1947 Both lacked adjustable compression European diesels used highly inefficient fuel 41 blend ethyl ether drugstore mineral oil made few friends Todays model diesels almost totally different design operation typical fuel mix modern diesels approximately 1/3 ether kerosene castor oil small percentage amyl nitrite added combustion stabilizer adjustable-compression feature makes todays model diesel engines usable exceedingly wide range propellers PAW 03 spins lOx 4 Graupner prop just reliably does 6 x 3 model diesels provide power output per minute run time per ounce total power system weight engine prop mount fuel supply etc other type energy source model airplane flying can get thrust longer time less weight May1998 53 Customization Tatone test mount makes breaking RC engines Reshaping distorted engine bolt heads pair left easy Engine Wagner-modified AlIen-Mercury 10 diesel almost like new third screw soon will John Eatons 25cc 15 CI Enaine 100% ball & roller bearings F Eiectronc magneto Prop hob & moont incrosed Hood start WI 4 lbs Current Price $1 5000 SOH$1300 Avajiable Now Prop nob & mount also sold separately Custom Woik U Repis his. mast mnpues Convusism quoted span requestl GIANT SCALE TR 260 CLOSE OUT ClOSE OUT PRICESI KIT 817900 SI H 825 ASP 848000 S & H 830 Mid-wing aerobatic design tsr 2 4 Cl ABS cowl hatch cover & wheel pants ARt covered w lb Ut acote Kr ghr 1518 ho 88 wingspan ARF weight lb 19 ho 92 wngspan * * ATTENDE SOPDI TIGER OWNERSI * * F nallyAva able amach nedbarstockroowithfollrollerbear ogs Soper T ger eng yes Super heavy dory tois will mprove performance glow ma tsr gas conversion 2500 & 3000- S4000 S & H model diesel engine can glow spark ignition CO2 compressed air Electric power rubber solid-fuel rocket motors still other advantages model diesels softer sound test ran few years ago four men three women opinion asked subject reported diesels noise less bothersome same-sized glow engine running same speed though Radio Shack sound meter indicated essentially same dBA Decibels Adjusted reading both engines Another feature like about model diesels use same fuel perform consistently winter summer high low humidity altitude nationwide car trip 1995 carried portable model engine test stand two best-performing small engines glow diesel several widely-differing environments Pennsylvania California tested both engines ease starting peak rpm using same fuels props throughout As expected glow engine performance varied considerably diesels adjustable compression made possible attain same rpm anywhere though its startability lessened little Albuquerques 7200-foot altitude no real difficulty getting perking anywhere else Replacement head kits available converting various glow engines diesels However own flying much prefer diesels specifically designed purpose Operating stresses diesel crankpins rods wristpins reach higher level glow engines thats diesel components massive conrod PAW 19 hefty rods used glow 29s convert Cox reed-valve engine diesel shafts rods cannot take extra punishment long common-but-false belief about model diesel engines higher compression set higher power output Overcompression ignites fuel/air mixture too soon piston still moving upward causes higher stresses higher operating temperature lower rpm High compression needed starting model diesel right engine cold once its running diesels compression screw should backed off gradually engine warms up normal operating temperature Ordinarily model diesels warmup takes 30 seconds minute Its sometimes V33 -9-9*-7U UNIVERSAL! MICRO SYSTEM! - ot4-~4~crystais $995 Plus shipping __________________ MODEL Z800 PROVEN DESIGN MADE IN USA MICROCHIP DESIGN FEATURES FM TRANSMITTER INTERCHANGEABLE same receiver works wrth popular FM transmitters FM SERVO INTERCHANGEABLE 4-pin connectors fit Airtronics Futaba J JR Hitec S DAD servo plugs SAFETY-LOCKED CONTROL FRAMING Digital processor locks Tx control frames faultless servo positioning Made USA Specifications 3Lx 1 25Wx 625H080z WI ABS plastic case Sensitivity 4 micro volts 2 miles free air range -Max Voltage l2Vdc-Current Drain 25 milliamps -1999 approved-Limited Five-Year Warranty -Crystal Interchangeable will honor warranties DAD receivers Master Card & visa accepted $3 Shipping/credit card $6 Shipping/COD 411 DIRECT Z400 RX ultra miniature 4-channel receiver PCM performance 27Mhz FM True digitai performance affected ucuat ce interference Microprocessor decoder Size 1 1/8 long 5/8 wide 1/2 tail Weight Lesn 1 oz Z400 TX Fuily syntheaized ail channei operation Servo Reversing Smari aize dry cell Nicd power z1000 Designed speciticaliy GIANT acale sirpiane Fully syntheaized receiver 50-channet capablilty Duai convernion high 3OiP protection aame great performance reirability aa Universai receiver Compatibie FM transmitter PPM format Microprocesaor decoder y opticaity isolated buffered servo outputs altows separate servo receiver battery No need separate fiitera buffers integral isolated smoke pump switch 6V @ 1 amp ZiODO Uittnate Ptua Same feytures plus servo battery data logging capability Size 3 tong 1 3/4 wide 5/8 tali ht 4 oz ZEBRA DIRECT 800-733-0211- Sales wwwzebradirectcom 317-733-0513 e FAX 317-733-0514 10706 De Andra Drive Zionsville IN 46077 54 Model Aviation 00 GIANT SCALE! $164~ necessary repeatedly adjust compression needle alternate steps optimum performance As lean out its mixture diesel runs hotter requires less compression adjustment sequence different glow engine baffles some modelers first soon becomes automatic habit Heres rule thumb simplify diesel learning process Adjust engines running compression its exhaust discharge no darker pale tan Black exhaust oil sure sign overcompression high stresses lower power output Some model diesels will run quite steadily test stand compression backed off point exhaust output looks clear olive oil However diesels usually run cooler flight test stand RC type diesels particular may perform consistently air theyre undercompressed Two objections often raised against model diesel engines involve fuel mixture ether kerosene smells much different glow fuel gasoline its pungent aroma tends linger long timeespecially clothing exhaust discharge rather oily Fastidious model fliers have called diesel users Oily Rag Brigade counteract first problem little care can handle dieselpowered models such way hands forearms contact fuel exhaust outflow have found thorough washup Lava soap elbows fingertips after flying removes trace diesel fuel aroma friend takes different approach uses skin protectant made fiberglass workers Its applied Quality Radio System Will Last Years Price Wont Last Long Focus 4 FM Complete Ni-Cd Radio System Two KS-ODD Std Servos Buy What Need Best Radio Lowest Possible Price perfect system you already have couple servos previous model need two servos rudder/ elevator sailplane two-channel powerplanel Buy exact servos need SAVE! complete system featuring fully rechargeable Ni-Cds switch harness overnight wall charger 8-channel Supreme FM receiver full hardware features servo reversing easy model setup just getting started need instructor trainer system ready 72 MHz FREE Today Add 5600 postage & handling CA residents add 7 75% sales tax Order TOLL HUBBY STORES MISSION 01540FOUNTAIN VA E DIEGO NOEl CAION LEWNOALE LANEWOOD AlAvary104005oo45ar0 80 uoyS 5541 BaThos409 6084065IV72SFIaotBottto StASSOoS St 20331 MagoOte435 Thy COUNt ESooth 086 50Balboa BurbankAt Saltaotyoo160th & BOatIttottlOReitlowa & Soot 714364-3300 6443040 5 9700 50 018905-1102619-4440135 31 214 244 010804-2515 RIVERSIDE ADENAA~iIOiiHEThos HABRASTORE HOURS T3lanV8a0B 280106 601819605 00181806851481471Near ItptoatSat 1000 600 10120 145-na AOO 27 NOIBthIAO01401S RaaOhRInOMon VII 1502 500 0097866773310-947 2574500 1002 505 atw Ofhrtrmq fou N&cvreJ UmmY Shack G5 Hobbies HOME OF THE CHAO5 KILLER CHAOS 60 size..$7995 UTTER CHAOS 60 sizeRR.R$6995 NEW.40 size Miss CHAOS.$65a00 NEW.80 Super CHAOS 95 FREE CATALOG Pt little CHAO5 life c1all Bob Lisa G45 1-800-628-6065 520-758-1100 May1998 55 Pick Up Hobby Shack like lotion dries thin impermeable film washes off readily soap water problem oily exhaust residue airplane easily solved same after-flying cleanup procedures used glow fliers merely need few paper towels cleanliness fanatics theres another approach Extend exhaust away model Most RC diesels Ive used seem quite insensitive exhaust back pressure lose no power quite long extensions muffler outlets anyone whod like give model diesel engines try highly recommend Eric Cluttons book Dr Diesels Diary Subtitled Wanted Know About Model Diesels fulfills description admirably Its available first-class mail author 913 Cedar Ln Tullahoma TN 37388 $1150 postpaid Two Helpful Hints simple modification all-metal engine test stand As shown photos throttle-actuating arrangement made sheet aluminum pop-riveted rear fixed part test stand throttle pushrod bent required common bicycle spoke has same end threads RC clevis second tip method restore damaged slots model engine screws works equally well straight-slot Phillips screws Drill holes sized damaged screws will just slip snugly piece mild steelanywhere /s thick Clamp steel firmly vise insert screws reform slots light caefully-aimed ball-peen hammer strokes Since slot distortion usually just metal distorted excessive force wrong-size screwdriver can almost always fixed progressively driving displaced metal back originally 1998 57 Sky Harbor RO Presents Mike Del Pontes Reviution V-Tail 0-500 Fits 40 size motors Handcrafted custom ARC Lightweight pre-built fuse piece sheeted wing epoxy carhon fiher reinforc ing Predictahie racing plane yet stahie docile sport plane Building set sp details included $135tt ping Imitations Only Revution Phoenix IA www tdcom/skyharrc Dennis & Dorinda Thomas Scale Outline ize a & Plywood construction ize designed tor YS 91 YS 140 Wing Cores r Canopy plus ABS cowl Scoop Exhaust Ouild Kit ARC Kit ges Rolled Plans ls Available le Racing/Sport Plane e Warbird Racing Association Champion
Edition: Model Aviation - 1998/05
Page Numbers: 52, 53, 54, 55, 57
U Joe Wagner MISCELLANY MONTH Theres new address head column recent move Alabama will allow considerably model flying now western Pennsylvanias weather permitted last few years Ill also able experiment model engines have some truly unusual engine developments complete test write about Engine Shop Several readers have written discuss topics mentioned previous columns two-stroke/four-stroke comparison stated effective displacement twostroke engines has always wrongly specified Thats because mathematical formula geometric piston displacement neglects inactive part stroke between Bottom Dead Center BDC point piston crown passes top edge exhaust ports received two dissenting letters about Neither came model engine manufacturer however nor renowned expert such Clarence Lee Bill Wisniewski George Aldrich have worked years development testing model airplane engines know experience about port timing ill effects excessive exhaust port height Anyone still feels geometric piston displacement two-stroke engine what determines its power output regardless its exhaust port dimensionsmight try reworking sleeve typical two-stroke glow engine grinding its exhaust ports higher Ill guarantee no power gain will result point neglected mention explanation four-stroke model airplane engine can put out essentially same useful propulsive power twostroke same nominal size despite fact provides half power strokes given rpm Besides corrected displacement factor just mentioned some two-stroke engines gross energy output has expended compressing fresh fuel/oil/air mixture its crankcase time its piston drives downward energy contributes nothing toward rotating propeller Two letters about column lubrication model engines repeated groundless rumor thats circulating among model fliers several months todays castor oil being produced solvent extraction process makes oil useless model fuel lubricant Castor oil being used American model fuel producers today works just well always has does produce insoluble wax flakes clog needle valve orifices nor other detrimental effect insoluble castor oil rumor false could model fuel blender hope stay business sold product made customers engines unrunnable 52 Model Aviation ese-made Silver Swallow 15 makes great CL power plant available Carlson Engine Imports Authors sixth attempt convert reed-valve Cox QRC 049 glow engine dieselthe crank web failed time Two PAW diesels best handbook model diesel operation Note tiny unobtrusive mufflerstypical PAW Another recurring question about castor oil concerns medicinal vs laxative-grade Medicinal castor oil works just well model engine lubrication other type difference laxative-grade castor oil costs because its pressed special variety castor bean mild flavor Model Diesel Engines Since end WW II diesels have extremely popular Europe type enginepowered model airplane flying until recently diesels never appealed much American model fliers possible reason poor reputation first US-made model diesels Drone 29 Mite 098 1947 Both lacked adjustable compression European diesels used highly inefficient fuel 41 blend ethyl ether drugstore mineral oil made few friends Todays model diesels almost totally different design operation typical fuel mix modern diesels approximately 1/3 ether kerosene castor oil small percentage amyl nitrite added combustion stabilizer adjustable-compression feature makes todays model diesel engines usable exceedingly wide range propellers PAW 03 spins lOx 4 Graupner prop just reliably does 6 x 3 model diesels provide power output per minute run time per ounce total power system weight engine prop mount fuel supply etc other type energy source model airplane flying can get thrust longer time less weight May1998 53 Customization Tatone test mount makes breaking RC engines Reshaping distorted engine bolt heads pair left easy Engine Wagner-modified AlIen-Mercury 10 diesel almost like new third screw soon will John Eatons 25cc 15 CI Enaine 100% ball & roller bearings F Eiectronc magneto Prop hob & moont incrosed Hood start WI 4 lbs Current Price $1 5000 SOH$1300 Avajiable Now Prop nob & mount also sold separately Custom Woik U Repis his. mast mnpues Convusism quoted span requestl GIANT SCALE TR 260 CLOSE OUT ClOSE OUT PRICESI KIT 817900 SI H 825 ASP 848000 S & H 830 Mid-wing aerobatic design tsr 2 4 Cl ABS cowl hatch cover & wheel pants ARt covered w lb Ut acote Kr ghr 1518 ho 88 wingspan ARF weight lb 19 ho 92 wngspan * * ATTENDE SOPDI TIGER OWNERSI * * F nallyAva able amach nedbarstockroowithfollrollerbear ogs Soper T ger eng yes Super heavy dory tois will mprove performance glow ma tsr gas conversion 2500 & 3000- S4000 S & H model diesel engine can glow spark ignition CO2 compressed air Electric power rubber solid-fuel rocket motors still other advantages model diesels softer sound test ran few years ago four men three women opinion asked subject reported diesels noise less bothersome same-sized glow engine running same speed though Radio Shack sound meter indicated essentially same dBA Decibels Adjusted reading both engines Another feature like about model diesels use same fuel perform consistently winter summer high low humidity altitude nationwide car trip 1995 carried portable model engine test stand two best-performing small engines glow diesel several widely-differing environments Pennsylvania California tested both engines ease starting peak rpm using same fuels props throughout As expected glow engine performance varied considerably diesels adjustable compression made possible attain same rpm anywhere though its startability lessened little Albuquerques 7200-foot altitude no real difficulty getting perking anywhere else Replacement head kits available converting various glow engines diesels However own flying much prefer diesels specifically designed purpose Operating stresses diesel crankpins rods wristpins reach higher level glow engines thats diesel components massive conrod PAW 19 hefty rods used glow 29s convert Cox reed-valve engine diesel shafts rods cannot take extra punishment long common-but-false belief about model diesel engines higher compression set higher power output Overcompression ignites fuel/air mixture too soon piston still moving upward causes higher stresses higher operating temperature lower rpm High compression needed starting model diesel right engine cold once its running diesels compression screw should backed off gradually engine warms up normal operating temperature Ordinarily model diesels warmup takes 30 seconds minute Its sometimes V33 -9-9*-7U UNIVERSAL! MICRO SYSTEM! - ot4-~4~crystais $995 Plus shipping __________________ MODEL Z800 PROVEN DESIGN MADE IN USA MICROCHIP DESIGN FEATURES FM TRANSMITTER INTERCHANGEABLE same receiver works wrth popular FM transmitters FM SERVO INTERCHANGEABLE 4-pin connectors fit Airtronics Futaba J JR Hitec S DAD servo plugs SAFETY-LOCKED CONTROL FRAMING Digital processor locks Tx control frames faultless servo positioning Made USA Specifications 3Lx 1 25Wx 625H080z WI ABS plastic case Sensitivity 4 micro volts 2 miles free air range -Max Voltage l2Vdc-Current Drain 25 milliamps -1999 approved-Limited Five-Year Warranty -Crystal Interchangeable will honor warranties DAD receivers Master Card & visa accepted $3 Shipping/credit card $6 Shipping/COD 411 DIRECT Z400 RX ultra miniature 4-channel receiver PCM performance 27Mhz FM True digitai performance affected ucuat ce interference Microprocessor decoder Size 1 1/8 long 5/8 wide 1/2 tail Weight Lesn 1 oz Z400 TX Fuily syntheaized ail channei operation Servo Reversing Smari aize dry cell Nicd power z1000 Designed speciticaliy GIANT acale sirpiane Fully syntheaized receiver 50-channet capablilty Duai convernion high 3OiP protection aame great performance reirability aa Universai receiver Compatibie FM transmitter PPM format Microprocesaor decoder y opticaity isolated buffered servo outputs altows separate servo receiver battery No need separate fiitera buffers integral isolated smoke pump switch 6V @ 1 amp ZiODO Uittnate Ptua Same feytures plus servo battery data logging capability Size 3 tong 1 3/4 wide 5/8 tali ht 4 oz ZEBRA DIRECT 800-733-0211- Sales wwwzebradirectcom 317-733-0513 e FAX 317-733-0514 10706 De Andra Drive Zionsville IN 46077 54 Model Aviation 00 GIANT SCALE! $164~ necessary repeatedly adjust compression needle alternate steps optimum performance As lean out its mixture diesel runs hotter requires less compression adjustment sequence different glow engine baffles some modelers first soon becomes automatic habit Heres rule thumb simplify diesel learning process Adjust engines running compression its exhaust discharge no darker pale tan Black exhaust oil sure sign overcompression high stresses lower power output Some model diesels will run quite steadily test stand compression backed off point exhaust output looks clear olive oil However diesels usually run cooler flight test stand RC type diesels particular may perform consistently air theyre undercompressed Two objections often raised against model diesel engines involve fuel mixture ether kerosene smells much different glow fuel gasoline its pungent aroma tends linger long timeespecially clothing exhaust discharge rather oily Fastidious model fliers have called diesel users Oily Rag Brigade counteract first problem little care can handle dieselpowered models such way hands forearms contact fuel exhaust outflow have found thorough washup Lava soap elbows fingertips after flying removes trace diesel fuel aroma friend takes different approach uses skin protectant made fiberglass workers Its applied Quality Radio System Will Last Years Price Wont Last Long Focus 4 FM Complete Ni-Cd Radio System Two KS-ODD Std Servos Buy What Need Best Radio Lowest Possible Price perfect system you already have couple servos previous model need two servos rudder/ elevator sailplane two-channel powerplanel Buy exact servos need SAVE! complete system featuring fully rechargeable Ni-Cds switch harness overnight wall charger 8-channel Supreme FM receiver full hardware features servo reversing easy model setup just getting started need instructor trainer system ready 72 MHz FREE Today Add 5600 postage & handling CA residents add 7 75% sales tax Order TOLL HUBBY STORES MISSION 01540FOUNTAIN VA E DIEGO NOEl CAION LEWNOALE LANEWOOD AlAvary104005oo45ar0 80 uoyS 5541 BaThos409 6084065IV72SFIaotBottto StASSOoS St 20331 MagoOte435 Thy COUNt ESooth 086 50Balboa BurbankAt Saltaotyoo160th & BOatIttottlOReitlowa & Soot 714364-3300 6443040 5 9700 50 018905-1102619-4440135 31 214 244 010804-2515 RIVERSIDE ADENAA~iIOiiHEThos HABRASTORE HOURS T3lanV8a0B 280106 601819605 00181806851481471Near ItptoatSat 1000 600 10120 145-na AOO 27 NOIBthIAO01401S RaaOhRInOMon VII 1502 500 0097866773310-947 2574500 1002 505 atw Ofhrtrmq fou N&cvreJ UmmY Shack G5 Hobbies HOME OF THE CHAO5 KILLER CHAOS 60 size..$7995 UTTER CHAOS 60 sizeRR.R$6995 NEW.40 size Miss CHAOS.$65a00 NEW.80 Super CHAOS 95 FREE CATALOG Pt little CHAO5 life c1all Bob Lisa G45 1-800-628-6065 520-758-1100 May1998 55 Pick Up Hobby Shack like lotion dries thin impermeable film washes off readily soap water problem oily exhaust residue airplane easily solved same after-flying cleanup procedures used glow fliers merely need few paper towels cleanliness fanatics theres another approach Extend exhaust away model Most RC diesels Ive used seem quite insensitive exhaust back pressure lose no power quite long extensions muffler outlets anyone whod like give model diesel engines try highly recommend Eric Cluttons book Dr Diesels Diary Subtitled Wanted Know About Model Diesels fulfills description admirably Its available first-class mail author 913 Cedar Ln Tullahoma TN 37388 $1150 postpaid Two Helpful Hints simple modification all-metal engine test stand As shown photos throttle-actuating arrangement made sheet aluminum pop-riveted rear fixed part test stand throttle pushrod bent required common bicycle spoke has same end threads RC clevis second tip method restore damaged slots model engine screws works equally well straight-slot Phillips screws Drill holes sized damaged screws will just slip snugly piece mild steelanywhere /s thick Clamp steel firmly vise insert screws reform slots light caefully-aimed ball-peen hammer strokes Since slot distortion usually just metal distorted excessive force wrong-size screwdriver can almost always fixed progressively driving displaced metal back originally 1998 57 Sky Harbor RO Presents Mike Del Pontes Reviution V-Tail 0-500 Fits 40 size motors Handcrafted custom ARC Lightweight pre-built fuse piece sheeted wing epoxy carhon fiher reinforc ing Predictahie racing plane yet stahie docile sport plane Building set sp details included $135tt ping Imitations Only Revution Phoenix IA www tdcom/skyharrc Dennis & Dorinda Thomas Scale Outline ize a & Plywood construction ize designed tor YS 91 YS 140 Wing Cores r Canopy plus ABS cowl Scoop Exhaust Ouild Kit ARC Kit ges Rolled Plans ls Available le Racing/Sport Plane e Warbird Racing Association Champion
Edition: Model Aviation - 1998/05
Page Numbers: 52, 53, 54, 55, 57
U Joe Wagner MISCELLANY MONTH Theres new address head column recent move Alabama will allow considerably model flying now western Pennsylvanias weather permitted last few years Ill also able experiment model engines have some truly unusual engine developments complete test write about Engine Shop Several readers have written discuss topics mentioned previous columns two-stroke/four-stroke comparison stated effective displacement twostroke engines has always wrongly specified Thats because mathematical formula geometric piston displacement neglects inactive part stroke between Bottom Dead Center BDC point piston crown passes top edge exhaust ports received two dissenting letters about Neither came model engine manufacturer however nor renowned expert such Clarence Lee Bill Wisniewski George Aldrich have worked years development testing model airplane engines know experience about port timing ill effects excessive exhaust port height Anyone still feels geometric piston displacement two-stroke engine what determines its power output regardless its exhaust port dimensionsmight try reworking sleeve typical two-stroke glow engine grinding its exhaust ports higher Ill guarantee no power gain will result point neglected mention explanation four-stroke model airplane engine can put out essentially same useful propulsive power twostroke same nominal size despite fact provides half power strokes given rpm Besides corrected displacement factor just mentioned some two-stroke engines gross energy output has expended compressing fresh fuel/oil/air mixture its crankcase time its piston drives downward energy contributes nothing toward rotating propeller Two letters about column lubrication model engines repeated groundless rumor thats circulating among model fliers several months todays castor oil being produced solvent extraction process makes oil useless model fuel lubricant Castor oil being used American model fuel producers today works just well always has does produce insoluble wax flakes clog needle valve orifices nor other detrimental effect insoluble castor oil rumor false could model fuel blender hope stay business sold product made customers engines unrunnable 52 Model Aviation ese-made Silver Swallow 15 makes great CL power plant available Carlson Engine Imports Authors sixth attempt convert reed-valve Cox QRC 049 glow engine dieselthe crank web failed time Two PAW diesels best handbook model diesel operation Note tiny unobtrusive mufflerstypical PAW Another recurring question about castor oil concerns medicinal vs laxative-grade Medicinal castor oil works just well model engine lubrication other type difference laxative-grade castor oil costs because its pressed special variety castor bean mild flavor Model Diesel Engines Since end WW II diesels have extremely popular Europe type enginepowered model airplane flying until recently diesels never appealed much American model fliers possible reason poor reputation first US-made model diesels Drone 29 Mite 098 1947 Both lacked adjustable compression European diesels used highly inefficient fuel 41 blend ethyl ether drugstore mineral oil made few friends Todays model diesels almost totally different design operation typical fuel mix modern diesels approximately 1/3 ether kerosene castor oil small percentage amyl nitrite added combustion stabilizer adjustable-compression feature makes todays model diesel engines usable exceedingly wide range propellers PAW 03 spins lOx 4 Graupner prop just reliably does 6 x 3 model diesels provide power output per minute run time per ounce total power system weight engine prop mount fuel supply etc other type energy source model airplane flying can get thrust longer time less weight May1998 53 Customization Tatone test mount makes breaking RC engines Reshaping distorted engine bolt heads pair left easy Engine Wagner-modified AlIen-Mercury 10 diesel almost like new third screw soon will John Eatons 25cc 15 CI Enaine 100% ball & roller bearings F Eiectronc magneto Prop hob & moont incrosed Hood start WI 4 lbs Current Price $1 5000 SOH$1300 Avajiable Now Prop nob & mount also sold separately Custom Woik U Repis his. mast mnpues Convusism quoted span requestl GIANT SCALE TR 260 CLOSE OUT ClOSE OUT PRICESI KIT 817900 SI H 825 ASP 848000 S & H 830 Mid-wing aerobatic design tsr 2 4 Cl ABS cowl hatch cover & wheel pants ARt covered w lb Ut acote Kr ghr 1518 ho 88 wingspan ARF weight lb 19 ho 92 wngspan * * ATTENDE SOPDI TIGER OWNERSI * * F nallyAva able amach nedbarstockroowithfollrollerbear ogs Soper T ger eng yes Super heavy dory tois will mprove performance glow ma tsr gas conversion 2500 & 3000- S4000 S & H model diesel engine can glow spark ignition CO2 compressed air Electric power rubber solid-fuel rocket motors still other advantages model diesels softer sound test ran few years ago four men three women opinion asked subject reported diesels noise less bothersome same-sized glow engine running same speed though Radio Shack sound meter indicated essentially same dBA Decibels Adjusted reading both engines Another feature like about model diesels use same fuel perform consistently winter summer high low humidity altitude nationwide car trip 1995 carried portable model engine test stand two best-performing small engines glow diesel several widely-differing environments Pennsylvania California tested both engines ease starting peak rpm using same fuels props throughout As expected glow engine performance varied considerably diesels adjustable compression made possible attain same rpm anywhere though its startability lessened little Albuquerques 7200-foot altitude no real difficulty getting perking anywhere else Replacement head kits available converting various glow engines diesels However own flying much prefer diesels specifically designed purpose Operating stresses diesel crankpins rods wristpins reach higher level glow engines thats diesel components massive conrod PAW 19 hefty rods used glow 29s convert Cox reed-valve engine diesel shafts rods cannot take extra punishment long common-but-false belief about model diesel engines higher compression set higher power output Overcompression ignites fuel/air mixture too soon piston still moving upward causes higher stresses higher operating temperature lower rpm High compression needed starting model diesel right engine cold once its running diesels compression screw should backed off gradually engine warms up normal operating temperature Ordinarily model diesels warmup takes 30 seconds minute Its sometimes V33 -9-9*-7U UNIVERSAL! MICRO SYSTEM! - ot4-~4~crystais $995 Plus shipping __________________ MODEL Z800 PROVEN DESIGN MADE IN USA MICROCHIP DESIGN FEATURES FM TRANSMITTER INTERCHANGEABLE same receiver works wrth popular FM transmitters FM SERVO INTERCHANGEABLE 4-pin connectors fit Airtronics Futaba J JR Hitec S DAD servo plugs SAFETY-LOCKED CONTROL FRAMING Digital processor locks Tx control frames faultless servo positioning Made USA Specifications 3Lx 1 25Wx 625H080z WI ABS plastic case Sensitivity 4 micro volts 2 miles free air range -Max Voltage l2Vdc-Current Drain 25 milliamps -1999 approved-Limited Five-Year Warranty -Crystal Interchangeable will honor warranties DAD receivers Master Card & visa accepted $3 Shipping/credit card $6 Shipping/COD 411 DIRECT Z400 RX ultra miniature 4-channel receiver PCM performance 27Mhz FM True digitai performance affected ucuat ce interference Microprocessor decoder Size 1 1/8 long 5/8 wide 1/2 tail Weight Lesn 1 oz Z400 TX Fuily syntheaized ail channei operation Servo Reversing Smari aize dry cell Nicd power z1000 Designed speciticaliy GIANT acale sirpiane Fully syntheaized receiver 50-channet capablilty Duai convernion high 3OiP protection aame great performance reirability aa Universai receiver Compatibie FM transmitter PPM format Microprocesaor decoder y opticaity isolated buffered servo outputs altows separate servo receiver battery No need separate fiitera buffers integral isolated smoke pump switch 6V @ 1 amp ZiODO Uittnate Ptua Same feytures plus servo battery data logging capability Size 3 tong 1 3/4 wide 5/8 tali ht 4 oz ZEBRA DIRECT 800-733-0211- Sales wwwzebradirectcom 317-733-0513 e FAX 317-733-0514 10706 De Andra Drive Zionsville IN 46077 54 Model Aviation 00 GIANT SCALE! $164~ necessary repeatedly adjust compression needle alternate steps optimum performance As lean out its mixture diesel runs hotter requires less compression adjustment sequence different glow engine baffles some modelers first soon becomes automatic habit Heres rule thumb simplify diesel learning process Adjust engines running compression its exhaust discharge no darker pale tan Black exhaust oil sure sign overcompression high stresses lower power output Some model diesels will run quite steadily test stand compression backed off point exhaust output looks clear olive oil However diesels usually run cooler flight test stand RC type diesels particular may perform consistently air theyre undercompressed Two objections often raised against model diesel engines involve fuel mixture ether kerosene smells much different glow fuel gasoline its pungent aroma tends linger long timeespecially clothing exhaust discharge rather oily Fastidious model fliers have called diesel users Oily Rag Brigade counteract first problem little care can handle dieselpowered models such way hands forearms contact fuel exhaust outflow have found thorough washup Lava soap elbows fingertips after flying removes trace diesel fuel aroma friend takes different approach uses skin protectant made fiberglass workers Its applied Quality Radio System Will Last Years Price Wont Last Long Focus 4 FM Complete Ni-Cd Radio System Two KS-ODD Std Servos Buy What Need Best Radio Lowest Possible Price perfect system you already have couple servos previous model need two servos rudder/ elevator sailplane two-channel powerplanel Buy exact servos need SAVE! complete system featuring fully rechargeable Ni-Cds switch harness overnight wall charger 8-channel Supreme FM receiver full hardware features servo reversing easy model setup just getting started need instructor trainer system ready 72 MHz FREE Today Add 5600 postage & handling CA residents add 7 75% sales tax Order TOLL HUBBY STORES MISSION 01540FOUNTAIN VA E DIEGO NOEl CAION LEWNOALE LANEWOOD AlAvary104005oo45ar0 80 uoyS 5541 BaThos409 6084065IV72SFIaotBottto StASSOoS St 20331 MagoOte435 Thy COUNt ESooth 086 50Balboa BurbankAt Saltaotyoo160th & BOatIttottlOReitlowa & Soot 714364-3300 6443040 5 9700 50 018905-1102619-4440135 31 214 244 010804-2515 RIVERSIDE ADENAA~iIOiiHEThos HABRASTORE HOURS T3lanV8a0B 280106 601819605 00181806851481471Near ItptoatSat 1000 600 10120 145-na AOO 27 NOIBthIAO01401S RaaOhRInOMon VII 1502 500 0097866773310-947 2574500 1002 505 atw Ofhrtrmq fou N&cvreJ UmmY Shack G5 Hobbies HOME OF THE CHAO5 KILLER CHAOS 60 size..$7995 UTTER CHAOS 60 sizeRR.R$6995 NEW.40 size Miss CHAOS.$65a00 NEW.80 Super CHAOS 95 FREE CATALOG Pt little CHAO5 life c1all Bob Lisa G45 1-800-628-6065 520-758-1100 May1998 55 Pick Up Hobby Shack like lotion dries thin impermeable film washes off readily soap water problem oily exhaust residue airplane easily solved same after-flying cleanup procedures used glow fliers merely need few paper towels cleanliness fanatics theres another approach Extend exhaust away model Most RC diesels Ive used seem quite insensitive exhaust back pressure lose no power quite long extensions muffler outlets anyone whod like give model diesel engines try highly recommend Eric Cluttons book Dr Diesels Diary Subtitled Wanted Know About Model Diesels fulfills description admirably Its available first-class mail author 913 Cedar Ln Tullahoma TN 37388 $1150 postpaid Two Helpful Hints simple modification all-metal engine test stand As shown photos throttle-actuating arrangement made sheet aluminum pop-riveted rear fixed part test stand throttle pushrod bent required common bicycle spoke has same end threads RC clevis second tip method restore damaged slots model engine screws works equally well straight-slot Phillips screws Drill holes sized damaged screws will just slip snugly piece mild steelanywhere /s thick Clamp steel firmly vise insert screws reform slots light caefully-aimed ball-peen hammer strokes Since slot distortion usually just metal distorted excessive force wrong-size screwdriver can almost always fixed progressively driving displaced metal back originally 1998 57 Sky Harbor RO Presents Mike Del Pontes Reviution V-Tail 0-500 Fits 40 size motors Handcrafted custom ARC Lightweight pre-built fuse piece sheeted wing epoxy carhon fiher reinforc ing Predictahie racing plane yet stahie docile sport plane Building set sp details included $135tt ping Imitations Only Revution Phoenix IA www tdcom/skyharrc Dennis & Dorinda Thomas Scale Outline ize a & Plywood construction ize designed tor YS 91 YS 140 Wing Cores r Canopy plus ABS cowl Scoop Exhaust Ouild Kit ARC Kit ges Rolled Plans ls Available le Racing/Sport Plane e Warbird Racing Association Champion
Edition: Model Aviation - 1998/05
Page Numbers: 52, 53, 54, 55, 57
U Joe Wagner MISCELLANY MONTH Theres new address head column recent move Alabama will allow considerably model flying now western Pennsylvanias weather permitted last few years Ill also able experiment model engines have some truly unusual engine developments complete test write about Engine Shop Several readers have written discuss topics mentioned previous columns two-stroke/four-stroke comparison stated effective displacement twostroke engines has always wrongly specified Thats because mathematical formula geometric piston displacement neglects inactive part stroke between Bottom Dead Center BDC point piston crown passes top edge exhaust ports received two dissenting letters about Neither came model engine manufacturer however nor renowned expert such Clarence Lee Bill Wisniewski George Aldrich have worked years development testing model airplane engines know experience about port timing ill effects excessive exhaust port height Anyone still feels geometric piston displacement two-stroke engine what determines its power output regardless its exhaust port dimensionsmight try reworking sleeve typical two-stroke glow engine grinding its exhaust ports higher Ill guarantee no power gain will result point neglected mention explanation four-stroke model airplane engine can put out essentially same useful propulsive power twostroke same nominal size despite fact provides half power strokes given rpm Besides corrected displacement factor just mentioned some two-stroke engines gross energy output has expended compressing fresh fuel/oil/air mixture its crankcase time its piston drives downward energy contributes nothing toward rotating propeller Two letters about column lubrication model engines repeated groundless rumor thats circulating among model fliers several months todays castor oil being produced solvent extraction process makes oil useless model fuel lubricant Castor oil being used American model fuel producers today works just well always has does produce insoluble wax flakes clog needle valve orifices nor other detrimental effect insoluble castor oil rumor false could model fuel blender hope stay business sold product made customers engines unrunnable 52 Model Aviation ese-made Silver Swallow 15 makes great CL power plant available Carlson Engine Imports Authors sixth attempt convert reed-valve Cox QRC 049 glow engine dieselthe crank web failed time Two PAW diesels best handbook model diesel operation Note tiny unobtrusive mufflerstypical PAW Another recurring question about castor oil concerns medicinal vs laxative-grade Medicinal castor oil works just well model engine lubrication other type difference laxative-grade castor oil costs because its pressed special variety castor bean mild flavor Model Diesel Engines Since end WW II diesels have extremely popular Europe type enginepowered model airplane flying until recently diesels never appealed much American model fliers possible reason poor reputation first US-made model diesels Drone 29 Mite 098 1947 Both lacked adjustable compression European diesels used highly inefficient fuel 41 blend ethyl ether drugstore mineral oil made few friends Todays model diesels almost totally different design operation typical fuel mix modern diesels approximately 1/3 ether kerosene castor oil small percentage amyl nitrite added combustion stabilizer adjustable-compression feature makes todays model diesel engines usable exceedingly wide range propellers PAW 03 spins lOx 4 Graupner prop just reliably does 6 x 3 model diesels provide power output per minute run time per ounce total power system weight engine prop mount fuel supply etc other type energy source model airplane flying can get thrust longer time less weight May1998 53 Customization Tatone test mount makes breaking RC engines Reshaping distorted engine bolt heads pair left easy Engine Wagner-modified AlIen-Mercury 10 diesel almost like new third screw soon will John Eatons 25cc 15 CI Enaine 100% ball & roller bearings F Eiectronc magneto Prop hob & moont incrosed Hood start WI 4 lbs Current Price $1 5000 SOH$1300 Avajiable Now Prop nob & mount also sold separately Custom Woik U Repis his. mast mnpues Convusism quoted span requestl GIANT SCALE TR 260 CLOSE OUT ClOSE OUT PRICESI KIT 817900 SI H 825 ASP 848000 S & H 830 Mid-wing aerobatic design tsr 2 4 Cl ABS cowl hatch cover & wheel pants ARt covered w lb Ut acote Kr ghr 1518 ho 88 wingspan ARF weight lb 19 ho 92 wngspan * * ATTENDE SOPDI TIGER OWNERSI * * F nallyAva able amach nedbarstockroowithfollrollerbear ogs Soper T ger eng yes Super heavy dory tois will mprove performance glow ma tsr gas conversion 2500 & 3000- S4000 S & H model diesel engine can glow spark ignition CO2 compressed air Electric power rubber solid-fuel rocket motors still other advantages model diesels softer sound test ran few years ago four men three women opinion asked subject reported diesels noise less bothersome same-sized glow engine running same speed though Radio Shack sound meter indicated essentially same dBA Decibels Adjusted reading both engines Another feature like about model diesels use same fuel perform consistently winter summer high low humidity altitude nationwide car trip 1995 carried portable model engine test stand two best-performing small engines glow diesel several widely-differing environments Pennsylvania California tested both engines ease starting peak rpm using same fuels props throughout As expected glow engine performance varied considerably diesels adjustable compression made possible attain same rpm anywhere though its startability lessened little Albuquerques 7200-foot altitude no real difficulty getting perking anywhere else Replacement head kits available converting various glow engines diesels However own flying much prefer diesels specifically designed purpose Operating stresses diesel crankpins rods wristpins reach higher level glow engines thats diesel components massive conrod PAW 19 hefty rods used glow 29s convert Cox reed-valve engine diesel shafts rods cannot take extra punishment long common-but-false belief about model diesel engines higher compression set higher power output Overcompression ignites fuel/air mixture too soon piston still moving upward causes higher stresses higher operating temperature lower rpm High compression needed starting model diesel right engine cold once its running diesels compression screw should backed off gradually engine warms up normal operating temperature Ordinarily model diesels warmup takes 30 seconds minute Its sometimes V33 -9-9*-7U UNIVERSAL! MICRO SYSTEM! - ot4-~4~crystais $995 Plus shipping __________________ MODEL Z800 PROVEN DESIGN MADE IN USA MICROCHIP DESIGN FEATURES FM TRANSMITTER INTERCHANGEABLE same receiver works wrth popular FM transmitters FM SERVO INTERCHANGEABLE 4-pin connectors fit Airtronics Futaba J JR Hitec S DAD servo plugs SAFETY-LOCKED CONTROL FRAMING Digital processor locks Tx control frames faultless servo positioning Made USA Specifications 3Lx 1 25Wx 625H080z WI ABS plastic case Sensitivity 4 micro volts 2 miles free air range -Max Voltage l2Vdc-Current Drain 25 milliamps -1999 approved-Limited Five-Year Warranty -Crystal Interchangeable will honor warranties DAD receivers Master Card & visa accepted $3 Shipping/credit card $6 Shipping/COD 411 DIRECT Z400 RX ultra miniature 4-channel receiver PCM performance 27Mhz FM True digitai performance affected ucuat ce interference Microprocessor decoder Size 1 1/8 long 5/8 wide 1/2 tail Weight Lesn 1 oz Z400 TX Fuily syntheaized ail channei operation Servo Reversing Smari aize dry cell Nicd power z1000 Designed speciticaliy GIANT acale sirpiane Fully syntheaized receiver 50-channet capablilty Duai convernion high 3OiP protection aame great performance reirability aa Universai receiver Compatibie FM transmitter PPM format Microprocesaor decoder y opticaity isolated buffered servo outputs altows separate servo receiver battery No need separate fiitera buffers integral isolated smoke pump switch 6V @ 1 amp ZiODO Uittnate Ptua Same feytures plus servo battery data logging capability Size 3 tong 1 3/4 wide 5/8 tali ht 4 oz ZEBRA DIRECT 800-733-0211- Sales wwwzebradirectcom 317-733-0513 e FAX 317-733-0514 10706 De Andra Drive Zionsville IN 46077 54 Model Aviation 00 GIANT SCALE! $164~ necessary repeatedly adjust compression needle alternate steps optimum performance As lean out its mixture diesel runs hotter requires less compression adjustment sequence different glow engine baffles some modelers first soon becomes automatic habit Heres rule thumb simplify diesel learning process Adjust engines running compression its exhaust discharge no darker pale tan Black exhaust oil sure sign overcompression high stresses lower power output Some model diesels will run quite steadily test stand compression backed off point exhaust output looks clear olive oil However diesels usually run cooler flight test stand RC type diesels particular may perform consistently air theyre undercompressed Two objections often raised against model diesel engines involve fuel mixture ether kerosene smells much different glow fuel gasoline its pungent aroma tends linger long timeespecially clothing exhaust discharge rather oily Fastidious model fliers have called diesel users Oily Rag Brigade counteract first problem little care can handle dieselpowered models such way hands forearms contact fuel exhaust outflow have found thorough washup Lava soap elbows fingertips after flying removes trace diesel fuel aroma friend takes different approach uses skin protectant made fiberglass workers Its applied Quality Radio System Will Last Years Price Wont Last Long Focus 4 FM Complete Ni-Cd Radio System Two KS-ODD Std Servos Buy What Need Best Radio Lowest Possible Price perfect system you already have couple servos previous model need two servos rudder/ elevator sailplane two-channel powerplanel Buy exact servos need SAVE! complete system featuring fully rechargeable Ni-Cds switch harness overnight wall charger 8-channel Supreme FM receiver full hardware features servo reversing easy model setup just getting started need instructor trainer system ready 72 MHz FREE Today Add 5600 postage & handling CA residents add 7 75% sales tax Order TOLL HUBBY STORES MISSION 01540FOUNTAIN VA E DIEGO NOEl CAION LEWNOALE LANEWOOD AlAvary104005oo45ar0 80 uoyS 5541 BaThos409 6084065IV72SFIaotBottto StASSOoS St 20331 MagoOte435 Thy COUNt ESooth 086 50Balboa BurbankAt Saltaotyoo160th & BOatIttottlOReitlowa & Soot 714364-3300 6443040 5 9700 50 018905-1102619-4440135 31 214 244 010804-2515 RIVERSIDE ADENAA~iIOiiHEThos HABRASTORE HOURS T3lanV8a0B 280106 601819605 00181806851481471Near ItptoatSat 1000 600 10120 145-na AOO 27 NOIBthIAO01401S RaaOhRInOMon VII 1502 500 0097866773310-947 2574500 1002 505 atw Ofhrtrmq fou N&cvreJ UmmY Shack G5 Hobbies HOME OF THE CHAO5 KILLER CHAOS 60 size..$7995 UTTER CHAOS 60 sizeRR.R$6995 NEW.40 size Miss CHAOS.$65a00 NEW.80 Super CHAOS 95 FREE CATALOG Pt little CHAO5 life c1all Bob Lisa G45 1-800-628-6065 520-758-1100 May1998 55 Pick Up Hobby Shack like lotion dries thin impermeable film washes off readily soap water problem oily exhaust residue airplane easily solved same after-flying cleanup procedures used glow fliers merely need few paper towels cleanliness fanatics theres another approach Extend exhaust away model Most RC diesels Ive used seem quite insensitive exhaust back pressure lose no power quite long extensions muffler outlets anyone whod like give model diesel engines try highly recommend Eric Cluttons book Dr Diesels Diary Subtitled Wanted Know About Model Diesels fulfills description admirably Its available first-class mail author 913 Cedar Ln Tullahoma TN 37388 $1150 postpaid Two Helpful Hints simple modification all-metal engine test stand As shown photos throttle-actuating arrangement made sheet aluminum pop-riveted rear fixed part test stand throttle pushrod bent required common bicycle spoke has same end threads RC clevis second tip method restore damaged slots model engine screws works equally well straight-slot Phillips screws Drill holes sized damaged screws will just slip snugly piece mild steelanywhere /s thick Clamp steel firmly vise insert screws reform slots light caefully-aimed ball-peen hammer strokes Since slot distortion usually just metal distorted excessive force wrong-size screwdriver can almost always fixed progressively driving displaced metal back originally 1998 57 Sky Harbor RO Presents Mike Del Pontes Reviution V-Tail 0-500 Fits 40 size motors Handcrafted custom ARC Lightweight pre-built fuse piece sheeted wing epoxy carhon fiher reinforc ing Predictahie racing plane yet stahie docile sport plane Building set sp details included $135tt ping Imitations Only Revution Phoenix IA www tdcom/skyharrc Dennis & Dorinda Thomas Scale Outline ize a & Plywood construction ize designed tor YS 91 YS 140 Wing Cores r Canopy plus ABS cowl Scoop Exhaust Ouild Kit ARC Kit ges Rolled Plans ls Available le Racing/Sport Plane e Warbird Racing Association Champion
Edition: Model Aviation - 1998/05
Page Numbers: 52, 53, 54, 55, 57
U Joe Wagner MISCELLANY MONTH Theres new address head column recent move Alabama will allow considerably model flying now western Pennsylvanias weather permitted last few years Ill also able experiment model engines have some truly unusual engine developments complete test write about Engine Shop Several readers have written discuss topics mentioned previous columns two-stroke/four-stroke comparison stated effective displacement twostroke engines has always wrongly specified Thats because mathematical formula geometric piston displacement neglects inactive part stroke between Bottom Dead Center BDC point piston crown passes top edge exhaust ports received two dissenting letters about Neither came model engine manufacturer however nor renowned expert such Clarence Lee Bill Wisniewski George Aldrich have worked years development testing model airplane engines know experience about port timing ill effects excessive exhaust port height Anyone still feels geometric piston displacement two-stroke engine what determines its power output regardless its exhaust port dimensionsmight try reworking sleeve typical two-stroke glow engine grinding its exhaust ports higher Ill guarantee no power gain will result point neglected mention explanation four-stroke model airplane engine can put out essentially same useful propulsive power twostroke same nominal size despite fact provides half power strokes given rpm Besides corrected displacement factor just mentioned some two-stroke engines gross energy output has expended compressing fresh fuel/oil/air mixture its crankcase time its piston drives downward energy contributes nothing toward rotating propeller Two letters about column lubrication model engines repeated groundless rumor thats circulating among model fliers several months todays castor oil being produced solvent extraction process makes oil useless model fuel lubricant Castor oil being used American model fuel producers today works just well always has does produce insoluble wax flakes clog needle valve orifices nor other detrimental effect insoluble castor oil rumor false could model fuel blender hope stay business sold product made customers engines unrunnable 52 Model Aviation ese-made Silver Swallow 15 makes great CL power plant available Carlson Engine Imports Authors sixth attempt convert reed-valve Cox QRC 049 glow engine dieselthe crank web failed time Two PAW diesels best handbook model diesel operation Note tiny unobtrusive mufflerstypical PAW Another recurring question about castor oil concerns medicinal vs laxative-grade Medicinal castor oil works just well model engine lubrication other type difference laxative-grade castor oil costs because its pressed special variety castor bean mild flavor Model Diesel Engines Since end WW II diesels have extremely popular Europe type enginepowered model airplane flying until recently diesels never appealed much American model fliers possible reason poor reputation first US-made model diesels Drone 29 Mite 098 1947 Both lacked adjustable compression European diesels used highly inefficient fuel 41 blend ethyl ether drugstore mineral oil made few friends Todays model diesels almost totally different design operation typical fuel mix modern diesels approximately 1/3 ether kerosene castor oil small percentage amyl nitrite added combustion stabilizer adjustable-compression feature makes todays model diesel engines usable exceedingly wide range propellers PAW 03 spins lOx 4 Graupner prop just reliably does 6 x 3 model diesels provide power output per minute run time per ounce total power system weight engine prop mount fuel supply etc other type energy source model airplane flying can get thrust longer time less weight May1998 53 Customization Tatone test mount makes breaking RC engines Reshaping distorted engine bolt heads pair left easy Engine Wagner-modified AlIen-Mercury 10 diesel almost like new third screw soon will John Eatons 25cc 15 CI Enaine 100% ball & roller bearings F Eiectronc magneto Prop hob & moont incrosed Hood start WI 4 lbs Current Price $1 5000 SOH$1300 Avajiable Now Prop nob & mount also sold separately Custom Woik U Repis his. mast mnpues Convusism quoted span requestl GIANT SCALE TR 260 CLOSE OUT ClOSE OUT PRICESI KIT 817900 SI H 825 ASP 848000 S & H 830 Mid-wing aerobatic design tsr 2 4 Cl ABS cowl hatch cover & wheel pants ARt covered w lb Ut acote Kr ghr 1518 ho 88 wingspan ARF weight lb 19 ho 92 wngspan * * ATTENDE SOPDI TIGER OWNERSI * * F nallyAva able amach nedbarstockroowithfollrollerbear ogs Soper T ger eng yes Super heavy dory tois will mprove performance glow ma tsr gas conversion 2500 & 3000- S4000 S & H model diesel engine can glow spark ignition CO2 compressed air Electric power rubber solid-fuel rocket motors still other advantages model diesels softer sound test ran few years ago four men three women opinion asked subject reported diesels noise less bothersome same-sized glow engine running same speed though Radio Shack sound meter indicated essentially same dBA Decibels Adjusted reading both engines Another feature like about model diesels use same fuel perform consistently winter summer high low humidity altitude nationwide car trip 1995 carried portable model engine test stand two best-performing small engines glow diesel several widely-differing environments Pennsylvania California tested both engines ease starting peak rpm using same fuels props throughout As expected glow engine performance varied considerably diesels adjustable compression made possible attain same rpm anywhere though its startability lessened little Albuquerques 7200-foot altitude no real difficulty getting perking anywhere else Replacement head kits available converting various glow engines diesels However own flying much prefer diesels specifically designed purpose Operating stresses diesel crankpins rods wristpins reach higher level glow engines thats diesel components massive conrod PAW 19 hefty rods used glow 29s convert Cox reed-valve engine diesel shafts rods cannot take extra punishment long common-but-false belief about model diesel engines higher compression set higher power output Overcompression ignites fuel/air mixture too soon piston still moving upward causes higher stresses higher operating temperature lower rpm High compression needed starting model diesel right engine cold once its running diesels compression screw should backed off gradually engine warms up normal operating temperature Ordinarily model diesels warmup takes 30 seconds minute Its sometimes V33 -9-9*-7U UNIVERSAL! MICRO SYSTEM! - ot4-~4~crystais $995 Plus shipping __________________ MODEL Z800 PROVEN DESIGN MADE IN USA MICROCHIP DESIGN FEATURES FM TRANSMITTER INTERCHANGEABLE same receiver works wrth popular FM transmitters FM SERVO INTERCHANGEABLE 4-pin connectors fit Airtronics Futaba J JR Hitec S DAD servo plugs SAFETY-LOCKED CONTROL FRAMING Digital processor locks Tx control frames faultless servo positioning Made USA Specifications 3Lx 1 25Wx 625H080z WI ABS plastic case Sensitivity 4 micro volts 2 miles free air range -Max Voltage l2Vdc-Current Drain 25 milliamps -1999 approved-Limited Five-Year Warranty -Crystal Interchangeable will honor warranties DAD receivers Master Card & visa accepted $3 Shipping/credit card $6 Shipping/COD 411 DIRECT Z400 RX ultra miniature 4-channel receiver PCM performance 27Mhz FM True digitai performance affected ucuat ce interference Microprocessor decoder Size 1 1/8 long 5/8 wide 1/2 tail Weight Lesn 1 oz Z400 TX Fuily syntheaized ail channei operation Servo Reversing Smari aize dry cell Nicd power z1000 Designed speciticaliy GIANT acale sirpiane Fully syntheaized receiver 50-channet capablilty Duai convernion high 3OiP protection aame great performance reirability aa Universai receiver Compatibie FM transmitter PPM format Microprocesaor decoder y opticaity isolated buffered servo outputs altows separate servo receiver battery No need separate fiitera buffers integral isolated smoke pump switch 6V @ 1 amp ZiODO Uittnate Ptua Same feytures plus servo battery data logging capability Size 3 tong 1 3/4 wide 5/8 tali ht 4 oz ZEBRA DIRECT 800-733-0211- Sales wwwzebradirectcom 317-733-0513 e FAX 317-733-0514 10706 De Andra Drive Zionsville IN 46077 54 Model Aviation 00 GIANT SCALE! $164~ necessary repeatedly adjust compression needle alternate steps optimum performance As lean out its mixture diesel runs hotter requires less compression adjustment sequence different glow engine baffles some modelers first soon becomes automatic habit Heres rule thumb simplify diesel learning process Adjust engines running compression its exhaust discharge no darker pale tan Black exhaust oil sure sign overcompression high stresses lower power output Some model diesels will run quite steadily test stand compression backed off point exhaust output looks clear olive oil However diesels usually run cooler flight test stand RC type diesels particular may perform consistently air theyre undercompressed Two objections often raised against model diesel engines involve fuel mixture ether kerosene smells much different glow fuel gasoline its pungent aroma tends linger long timeespecially clothing exhaust discharge rather oily Fastidious model fliers have called diesel users Oily Rag Brigade counteract first problem little care can handle dieselpowered models such way hands forearms contact fuel exhaust outflow have found thorough washup Lava soap elbows fingertips after flying removes trace diesel fuel aroma friend takes different approach uses skin protectant made fiberglass workers Its applied Quality Radio System Will Last Years Price Wont Last Long Focus 4 FM Complete Ni-Cd Radio System Two KS-ODD Std Servos Buy What Need Best Radio Lowest Possible Price perfect system you already have couple servos previous model need two servos rudder/ elevator sailplane two-channel powerplanel Buy exact servos need SAVE! complete system featuring fully rechargeable Ni-Cds switch harness overnight wall charger 8-channel Supreme FM receiver full hardware features servo reversing easy model setup just getting started need instructor trainer system ready 72 MHz FREE Today Add 5600 postage & handling CA residents add 7 75% sales tax Order TOLL HUBBY STORES MISSION 01540FOUNTAIN VA E DIEGO NOEl CAION LEWNOALE LANEWOOD AlAvary104005oo45ar0 80 uoyS 5541 BaThos409 6084065IV72SFIaotBottto StASSOoS St 20331 MagoOte435 Thy COUNt ESooth 086 50Balboa BurbankAt Saltaotyoo160th & BOatIttottlOReitlowa & Soot 714364-3300 6443040 5 9700 50 018905-1102619-4440135 31 214 244 010804-2515 RIVERSIDE ADENAA~iIOiiHEThos HABRASTORE HOURS T3lanV8a0B 280106 601819605 00181806851481471Near ItptoatSat 1000 600 10120 145-na AOO 27 NOIBthIAO01401S RaaOhRInOMon VII 1502 500 0097866773310-947 2574500 1002 505 atw Ofhrtrmq fou N&cvreJ UmmY Shack G5 Hobbies HOME OF THE CHAO5 KILLER CHAOS 60 size..$7995 UTTER CHAOS 60 sizeRR.R$6995 NEW.40 size Miss CHAOS.$65a00 NEW.80 Super CHAOS 95 FREE CATALOG Pt little CHAO5 life c1all Bob Lisa G45 1-800-628-6065 520-758-1100 May1998 55 Pick Up Hobby Shack like lotion dries thin impermeable film washes off readily soap water problem oily exhaust residue airplane easily solved same after-flying cleanup procedures used glow fliers merely need few paper towels cleanliness fanatics theres another approach Extend exhaust away model Most RC diesels Ive used seem quite insensitive exhaust back pressure lose no power quite long extensions muffler outlets anyone whod like give model diesel engines try highly recommend Eric Cluttons book Dr Diesels Diary Subtitled Wanted Know About Model Diesels fulfills description admirably Its available first-class mail author 913 Cedar Ln Tullahoma TN 37388 $1150 postpaid Two Helpful Hints simple modification all-metal engine test stand As shown photos throttle-actuating arrangement made sheet aluminum pop-riveted rear fixed part test stand throttle pushrod bent required common bicycle spoke has same end threads RC clevis second tip method restore damaged slots model engine screws works equally well straight-slot Phillips screws Drill holes sized damaged screws will just slip snugly piece mild steelanywhere /s thick Clamp steel firmly vise insert screws reform slots light caefully-aimed ball-peen hammer strokes Since slot distortion usually just metal distorted excessive force wrong-size screwdriver can almost always fixed progressively driving displaced metal back originally 1998 57 Sky Harbor RO Presents Mike Del Pontes Reviution V-Tail 0-500 Fits 40 size motors Handcrafted custom ARC Lightweight pre-built fuse piece sheeted wing epoxy carhon fiher reinforc ing Predictahie racing plane yet stahie docile sport plane Building set sp details included $135tt ping Imitations Only Revution Phoenix IA www tdcom/skyharrc Dennis & Dorinda Thomas Scale Outline ize a & Plywood construction ize designed tor YS 91 YS 140 Wing Cores r Canopy plus ABS cowl Scoop Exhaust Ouild Kit ARC Kit ges Rolled Plans ls Available le Racing/Sport Plane e Warbird Racing Association Champion