IIOGeoigeN4Myers ABSOLUTE RADIATED power meas urements extremely difficult make therefore rarely done Most often person wishes know something about transmitter performance will connect standard dipole turn measure energy received vicinity antenna using field-strength meter Next will repeat measurements time transmitter connected whatever antenna proposes use results reported .....Db relative standard dipole measurements easy make because affected such extrane ous factors reflections metal ob jects vicinity conduction radi ated signal buried suspended wires like electric power cables radia tion other transmitters vicinity term other transmitters includes radiation local oscillators receiv ers like TV CR car radios etc prob lems enumerated further complicated considerations relative sizes alignments transmitter fieldstrength meter antenna spacing relative wavelength trans mitted signal folks RS Systems Tech Serv Inc 5301 Holland Drive Beltsville MD 20705 have come up clever device sidesteps above problems Opening case inspection find usual milliampmeter diode scaling resistor place antenna capacitor see piece PC board metal contact metal contact held against antenna Fig 1 pair plastic clips RS-RFM RE meter PC board held fixed distance antenna geometry plastic case fixed geometry very close coupling yields constant setup ignores external radiations reflections also allows factory calibrate meter read 500 milliwatts l0% midscale unit clipped center customary whip antenna Since meter calibrated point no claims made linearity accuracy reading elsewhere scale As can seen Fig 2 meter indica tion very strongly influenced posi tioning device along length antenna have reduced test data percentage length col lapsible metal antenna including length inside transmitter case applica ble ignoring length created loading coils output circuitry Owners RFM might tempted compare indicated power outputs among competing brands thereby developing form 'horsepower race~ industry Id like advise against maximum legal power output 72 MHz band 750 milliwatts transmitters government has already licensed hun dreds voice transmitters right frequencies legal outputs above 500 watts Any minor changes can make insignificant compared sides way get power out put power price 500-watt power supply made nicads will amaze Use system performance guide power output OK comparison shopping what use thing immedi ate use suggested curves 4A 4B Fig 2 see meter indi cates battery condition much clearly LEDs provided Cox/Sanwa though LEDs buried black tubes provided magnifying lenses nearly unreadable sunlight RS-RSM may useful owners sets output meters sets equipped meters always pegged full scale useful off flags Another worthwhile use check transmitter output function temper ature RC system changes temperature some others Would believe transmitter stops transmitting 550 F 1100 F Ive en countered both types unit quit 550 F particularly frustrating since worked well enough get plane air after ground range check July1977 15 Fig 1 RS-RFM modified gluing spring clothespin place clips provided order accommodate wider range antenna diameters such tiny shown I-Hg i RU ulII ervo LycIesee texiror item servo maintenance useful tools can buy 77P /00 u~4 q5 0 Bo 70 60 90 30 20 /0 / / / // // 4/ A/C6DL P05/7/OAf ON kFAI 4sj7 SG-W U7~ Z 1J713 quit flying took case cool down temper ature reached car heater going brought pieces car get warm studied problem thing started work again Naturally transmitter no meter finally caught what happening realized CB walkie-talkie using RC receiver crystal fre quency monitor suddenly started growling again motor noise outside hadnt missed RSM isnt affected motor noise will work audio monitors dont Lets say few words about audio monitors Major contests usually monitor RC frequencies expensive ham re ceivers Some form verbal communica tion between monitoring location flight line must used get around noise problem mentioned above Re cently World Engines made available series monitors built particularly RC frequencies too suffer audible noise Has anyone out therefigured way bolt device will raise flag flash large light indicate fre quencies use Carrying job little farther about adding alarm bell siren raucous buzzer flag-waver indi cate two transmissions same frequency World Engines scan ning monitor already contains sig nal generators needed need some amplifiers clever source cheap output devices whole thing could housed box could mounted cars flight line powered car battery generator about readers dreaming about would pretty easy add provision usual clothespin way pin stored monitor frequency would scanned Only fre quencies pin removed would scanned act taking pin would put taker face face evidence frequency use fact tool serious RC modeler should have some kind servo tester Fig 3 shows Ace Servo Cycle available Ace RC Inc Box 511 116 19th St Higginsville MO 64037 unit available kit completed unit will install between flight battery pack servo providing cut aileron extender cable half make necessary mating plugs available Once connected will cycle servo end its travel other auto matically good examining servo since removes rest sys tem concern source anomalies continued page84 16 Model Aviation 7AAJSMWFR JOWPI4nCAJ I L4MvE77 /00 MW WALK/C -7SKIE zzo7sMiqJ 2 bvoW JAPer 7 724o MiV %4c~c/sww4 2-CMJAEL a/G8V 754oAwc3d/q 8Coc/S4LswA ZVAAM/El z4V 7$~4ovA3V4 eM MN 240 4 4 fuel prices going up almost day makes sense add return line fuel pump system catch end re-use overflow saves grass sez George MORE GOsame powerYELLOW ~eePROPELLEFB de o9 Taco 5354h aP9oBlade63 6-4 er74 76 78 5O zeeach8486 88 65 \ a6364104106 86 8-611-411-611-81 86889-6 106 1 128AC124 961063 BladeTractorT25126 iso 104 1606-3 64 GRISH ushee3 Blade Pusher Metallici5o63 504 ST JOHN BROS INDIANA 46373 R C Technique/Myers continued page 16 Knowing servo should moving smoothly between limits have set internal potentiometers stick ing intermittent action unequal speeds two directions must caused defects within servo device also useful building manual posi tion switch transfers control servo knob front panel al lows examine installations interferences binding still workbench necessary tools deal problem Finally after servicing servo al ways good idea set automatic cycling few minutes let new problems appear Its surprising trash can collect inside freshly-repaired servo Chief among culprits bits steel attracted magnet servo-motor Ace Servo Cycle pro vides both positive negative control pulses instructions include ex tensive list proper pulse various manufacturers should able service practically servo market modification found useful addition 5-terminal soldering lug makes addition pigtails new servo types simple matter used scheme output side avoid short ccuit problems would generateo group parallelconnected exposed-pin plugs bat tery-pack side folks building servo-reversers use R100KCl MF RT whatever has to center servo Start 1 Meg work down George M Myers 70 Froehlich Farm Rd Hicks yule NY 11801 Stiletto/McDonald continued page 32 around pushrod washer will applied Next cut small section washer pliers gently com press washer groove solder pushrod fairleads should made plywood just loose enough pushrod can move freely Allowed too much freedom fairlead pushrod will rattle isnt good because its hard look cool airplane sounds like its falling apart Vince set up engines Les Building engine simple Get ting run exactly way want another story best running engines ever never disas sembled cleaning build motors maybe yes maybe no style After engine disassembled wet sand inside case 320 50 sleeve will slide easily position Drill ing spray bar hole tapping muf fler mount other changes outside should done point relocate needle valve just ahead stock ar rangement passes through center venturi about 5/ above center line allows motor run bit faster inverted Ill explain later venturis obtain set Bob Wilder 2010 Boston Street Irving Texas 75061 260 270 275 280 will good variety drill out mount holes file lugs can shift engine around offset need Im trimming have really space age method fitting ring Push sleeve square up piston remove piston start looking hold front bright light can see gaps tween ring sleeve rotate ring few degrees time keep checking cant detect light leaks care fully box up parts send because youve got first class fit Anyway just keep going through rings until find fits well Always bear mind sleeve might perfectly round different rings keep showing gap position sleeve try another sleeve end gap should about 006 isnt much considering sheet paper usually about 003 After deciding ring sleeve Im going use carefully deburr inside ring piston land Xacto knife new Supertigres use full circle crank aluminum stuffing band has known fly off engine grossly overheated actual case ofthisl know Sunday RC incident refuse discuss further en gine seems run same with out decide remove thing cause Murphys Law part substitute front bearing replace Consolidated EL-7-ZZ rear shield removed Last year engine just wouldnt run long enough test stand noticed what seemed quite bit fuel coming out under drive washer simply installing plastic shield bearing picked up 15 seconds running time Just make sure everything okay run engine about 15 20 minutes bench also allows tighten head backplate screws motor warm should take about 20 flights decide engine worthwhile its right youll know Wynn What procedures follow trimming new airplane Les Trying get new model trimmed hassle degree hassle depends Prop Drive Big Airplanes Specifically de signed accept 60-size engines Du-Bro prop drive will fit engine t will easily power airplanes weighing much 30 lbs Thisdevelopment definite break through RPM range 600 6000 depending engine prop used20- 22- 24-in wood props available Grish Bros Appli cations myriad example large scale models movement afoot aiming Ia-in Scale event ultra-big old-timers other models large cowlsas well overall size weightmade impossible huge 8ud Nosen scale kits similar obviously will benefit greatly Slow powerful flight will prove especially realistic gearing downa double belt drive utilizedan effective boost thrust real ized big propellers being sensi bly related size craft achieve truly effective performance levels Price $10000 less engine prop Du-Bro Pro ducts Inc Wauconda IL 60084 product review product review product review 84 Model Aviation product review product review product review
Edition: Model Aviation - 1977/07
Page Numbers: 15, 16, 84
IIOGeoigeN4Myers ABSOLUTE RADIATED power meas urements extremely difficult make therefore rarely done Most often person wishes know something about transmitter performance will connect standard dipole turn measure energy received vicinity antenna using field-strength meter Next will repeat measurements time transmitter connected whatever antenna proposes use results reported .....Db relative standard dipole measurements easy make because affected such extrane ous factors reflections metal ob jects vicinity conduction radi ated signal buried suspended wires like electric power cables radia tion other transmitters vicinity term other transmitters includes radiation local oscillators receiv ers like TV CR car radios etc prob lems enumerated further complicated considerations relative sizes alignments transmitter fieldstrength meter antenna spacing relative wavelength trans mitted signal folks RS Systems Tech Serv Inc 5301 Holland Drive Beltsville MD 20705 have come up clever device sidesteps above problems Opening case inspection find usual milliampmeter diode scaling resistor place antenna capacitor see piece PC board metal contact metal contact held against antenna Fig 1 pair plastic clips RS-RFM RE meter PC board held fixed distance antenna geometry plastic case fixed geometry very close coupling yields constant setup ignores external radiations reflections also allows factory calibrate meter read 500 milliwatts l0% midscale unit clipped center customary whip antenna Since meter calibrated point no claims made linearity accuracy reading elsewhere scale As can seen Fig 2 meter indica tion very strongly influenced posi tioning device along length antenna have reduced test data percentage length col lapsible metal antenna including length inside transmitter case applica ble ignoring length created loading coils output circuitry Owners RFM might tempted compare indicated power outputs among competing brands thereby developing form 'horsepower race~ industry Id like advise against maximum legal power output 72 MHz band 750 milliwatts transmitters government has already licensed hun dreds voice transmitters right frequencies legal outputs above 500 watts Any minor changes can make insignificant compared sides way get power out put power price 500-watt power supply made nicads will amaze Use system performance guide power output OK comparison shopping what use thing immedi ate use suggested curves 4A 4B Fig 2 see meter indi cates battery condition much clearly LEDs provided Cox/Sanwa though LEDs buried black tubes provided magnifying lenses nearly unreadable sunlight RS-RSM may useful owners sets output meters sets equipped meters always pegged full scale useful off flags Another worthwhile use check transmitter output function temper ature RC system changes temperature some others Would believe transmitter stops transmitting 550 F 1100 F Ive en countered both types unit quit 550 F particularly frustrating since worked well enough get plane air after ground range check July1977 15 Fig 1 RS-RFM modified gluing spring clothespin place clips provided order accommodate wider range antenna diameters such tiny shown I-Hg i RU ulII ervo LycIesee texiror item servo maintenance useful tools can buy 77P /00 u~4 q5 0 Bo 70 60 90 30 20 /0 / / / // // 4/ A/C6DL P05/7/OAf ON kFAI 4sj7 SG-W U7~ Z 1J713 quit flying took case cool down temper ature reached car heater going brought pieces car get warm studied problem thing started work again Naturally transmitter no meter finally caught what happening realized CB walkie-talkie using RC receiver crystal fre quency monitor suddenly started growling again motor noise outside hadnt missed RSM isnt affected motor noise will work audio monitors dont Lets say few words about audio monitors Major contests usually monitor RC frequencies expensive ham re ceivers Some form verbal communica tion between monitoring location flight line must used get around noise problem mentioned above Re cently World Engines made available series monitors built particularly RC frequencies too suffer audible noise Has anyone out therefigured way bolt device will raise flag flash large light indicate fre quencies use Carrying job little farther about adding alarm bell siren raucous buzzer flag-waver indi cate two transmissions same frequency World Engines scan ning monitor already contains sig nal generators needed need some amplifiers clever source cheap output devices whole thing could housed box could mounted cars flight line powered car battery generator about readers dreaming about would pretty easy add provision usual clothespin way pin stored monitor frequency would scanned Only fre quencies pin removed would scanned act taking pin would put taker face face evidence frequency use fact tool serious RC modeler should have some kind servo tester Fig 3 shows Ace Servo Cycle available Ace RC Inc Box 511 116 19th St Higginsville MO 64037 unit available kit completed unit will install between flight battery pack servo providing cut aileron extender cable half make necessary mating plugs available Once connected will cycle servo end its travel other auto matically good examining servo since removes rest sys tem concern source anomalies continued page84 16 Model Aviation 7AAJSMWFR JOWPI4nCAJ I L4MvE77 /00 MW WALK/C -7SKIE zzo7sMiqJ 2 bvoW JAPer 7 724o MiV %4c~c/sww4 2-CMJAEL a/G8V 754oAwc3d/q 8Coc/S4LswA ZVAAM/El z4V 7$~4ovA3V4 eM MN 240 4 4 fuel prices going up almost day makes sense add return line fuel pump system catch end re-use overflow saves grass sez George MORE GOsame powerYELLOW ~eePROPELLEFB de o9 Taco 5354h aP9oBlade63 6-4 er74 76 78 5O zeeach8486 88 65 \ a6364104106 86 8-611-411-611-81 86889-6 106 1 128AC124 961063 BladeTractorT25126 iso 104 1606-3 64 GRISH ushee3 Blade Pusher Metallici5o63 504 ST JOHN BROS INDIANA 46373 R C Technique/Myers continued page 16 Knowing servo should moving smoothly between limits have set internal potentiometers stick ing intermittent action unequal speeds two directions must caused defects within servo device also useful building manual posi tion switch transfers control servo knob front panel al lows examine installations interferences binding still workbench necessary tools deal problem Finally after servicing servo al ways good idea set automatic cycling few minutes let new problems appear Its surprising trash can collect inside freshly-repaired servo Chief among culprits bits steel attracted magnet servo-motor Ace Servo Cycle pro vides both positive negative control pulses instructions include ex tensive list proper pulse various manufacturers should able service practically servo market modification found useful addition 5-terminal soldering lug makes addition pigtails new servo types simple matter used scheme output side avoid short ccuit problems would generateo group parallelconnected exposed-pin plugs bat tery-pack side folks building servo-reversers use R100KCl MF RT whatever has to center servo Start 1 Meg work down George M Myers 70 Froehlich Farm Rd Hicks yule NY 11801 Stiletto/McDonald continued page 32 around pushrod washer will applied Next cut small section washer pliers gently com press washer groove solder pushrod fairleads should made plywood just loose enough pushrod can move freely Allowed too much freedom fairlead pushrod will rattle isnt good because its hard look cool airplane sounds like its falling apart Vince set up engines Les Building engine simple Get ting run exactly way want another story best running engines ever never disas sembled cleaning build motors maybe yes maybe no style After engine disassembled wet sand inside case 320 50 sleeve will slide easily position Drill ing spray bar hole tapping muf fler mount other changes outside should done point relocate needle valve just ahead stock ar rangement passes through center venturi about 5/ above center line allows motor run bit faster inverted Ill explain later venturis obtain set Bob Wilder 2010 Boston Street Irving Texas 75061 260 270 275 280 will good variety drill out mount holes file lugs can shift engine around offset need Im trimming have really space age method fitting ring Push sleeve square up piston remove piston start looking hold front bright light can see gaps tween ring sleeve rotate ring few degrees time keep checking cant detect light leaks care fully box up parts send because youve got first class fit Anyway just keep going through rings until find fits well Always bear mind sleeve might perfectly round different rings keep showing gap position sleeve try another sleeve end gap should about 006 isnt much considering sheet paper usually about 003 After deciding ring sleeve Im going use carefully deburr inside ring piston land Xacto knife new Supertigres use full circle crank aluminum stuffing band has known fly off engine grossly overheated actual case ofthisl know Sunday RC incident refuse discuss further en gine seems run same with out decide remove thing cause Murphys Law part substitute front bearing replace Consolidated EL-7-ZZ rear shield removed Last year engine just wouldnt run long enough test stand noticed what seemed quite bit fuel coming out under drive washer simply installing plastic shield bearing picked up 15 seconds running time Just make sure everything okay run engine about 15 20 minutes bench also allows tighten head backplate screws motor warm should take about 20 flights decide engine worthwhile its right youll know Wynn What procedures follow trimming new airplane Les Trying get new model trimmed hassle degree hassle depends Prop Drive Big Airplanes Specifically de signed accept 60-size engines Du-Bro prop drive will fit engine t will easily power airplanes weighing much 30 lbs Thisdevelopment definite break through RPM range 600 6000 depending engine prop used20- 22- 24-in wood props available Grish Bros Appli cations myriad example large scale models movement afoot aiming Ia-in Scale event ultra-big old-timers other models large cowlsas well overall size weightmade impossible huge 8ud Nosen scale kits similar obviously will benefit greatly Slow powerful flight will prove especially realistic gearing downa double belt drive utilizedan effective boost thrust real ized big propellers being sensi bly related size craft achieve truly effective performance levels Price $10000 less engine prop Du-Bro Pro ducts Inc Wauconda IL 60084 product review product review product review 84 Model Aviation product review product review product review
Edition: Model Aviation - 1977/07
Page Numbers: 15, 16, 84
IIOGeoigeN4Myers ABSOLUTE RADIATED power meas urements extremely difficult make therefore rarely done Most often person wishes know something about transmitter performance will connect standard dipole turn measure energy received vicinity antenna using field-strength meter Next will repeat measurements time transmitter connected whatever antenna proposes use results reported .....Db relative standard dipole measurements easy make because affected such extrane ous factors reflections metal ob jects vicinity conduction radi ated signal buried suspended wires like electric power cables radia tion other transmitters vicinity term other transmitters includes radiation local oscillators receiv ers like TV CR car radios etc prob lems enumerated further complicated considerations relative sizes alignments transmitter fieldstrength meter antenna spacing relative wavelength trans mitted signal folks RS Systems Tech Serv Inc 5301 Holland Drive Beltsville MD 20705 have come up clever device sidesteps above problems Opening case inspection find usual milliampmeter diode scaling resistor place antenna capacitor see piece PC board metal contact metal contact held against antenna Fig 1 pair plastic clips RS-RFM RE meter PC board held fixed distance antenna geometry plastic case fixed geometry very close coupling yields constant setup ignores external radiations reflections also allows factory calibrate meter read 500 milliwatts l0% midscale unit clipped center customary whip antenna Since meter calibrated point no claims made linearity accuracy reading elsewhere scale As can seen Fig 2 meter indica tion very strongly influenced posi tioning device along length antenna have reduced test data percentage length col lapsible metal antenna including length inside transmitter case applica ble ignoring length created loading coils output circuitry Owners RFM might tempted compare indicated power outputs among competing brands thereby developing form 'horsepower race~ industry Id like advise against maximum legal power output 72 MHz band 750 milliwatts transmitters government has already licensed hun dreds voice transmitters right frequencies legal outputs above 500 watts Any minor changes can make insignificant compared sides way get power out put power price 500-watt power supply made nicads will amaze Use system performance guide power output OK comparison shopping what use thing immedi ate use suggested curves 4A 4B Fig 2 see meter indi cates battery condition much clearly LEDs provided Cox/Sanwa though LEDs buried black tubes provided magnifying lenses nearly unreadable sunlight RS-RSM may useful owners sets output meters sets equipped meters always pegged full scale useful off flags Another worthwhile use check transmitter output function temper ature RC system changes temperature some others Would believe transmitter stops transmitting 550 F 1100 F Ive en countered both types unit quit 550 F particularly frustrating since worked well enough get plane air after ground range check July1977 15 Fig 1 RS-RFM modified gluing spring clothespin place clips provided order accommodate wider range antenna diameters such tiny shown I-Hg i RU ulII ervo LycIesee texiror item servo maintenance useful tools can buy 77P /00 u~4 q5 0 Bo 70 60 90 30 20 /0 / / / // // 4/ A/C6DL P05/7/OAf ON kFAI 4sj7 SG-W U7~ Z 1J713 quit flying took case cool down temper ature reached car heater going brought pieces car get warm studied problem thing started work again Naturally transmitter no meter finally caught what happening realized CB walkie-talkie using RC receiver crystal fre quency monitor suddenly started growling again motor noise outside hadnt missed RSM isnt affected motor noise will work audio monitors dont Lets say few words about audio monitors Major contests usually monitor RC frequencies expensive ham re ceivers Some form verbal communica tion between monitoring location flight line must used get around noise problem mentioned above Re cently World Engines made available series monitors built particularly RC frequencies too suffer audible noise Has anyone out therefigured way bolt device will raise flag flash large light indicate fre quencies use Carrying job little farther about adding alarm bell siren raucous buzzer flag-waver indi cate two transmissions same frequency World Engines scan ning monitor already contains sig nal generators needed need some amplifiers clever source cheap output devices whole thing could housed box could mounted cars flight line powered car battery generator about readers dreaming about would pretty easy add provision usual clothespin way pin stored monitor frequency would scanned Only fre quencies pin removed would scanned act taking pin would put taker face face evidence frequency use fact tool serious RC modeler should have some kind servo tester Fig 3 shows Ace Servo Cycle available Ace RC Inc Box 511 116 19th St Higginsville MO 64037 unit available kit completed unit will install between flight battery pack servo providing cut aileron extender cable half make necessary mating plugs available Once connected will cycle servo end its travel other auto matically good examining servo since removes rest sys tem concern source anomalies continued page84 16 Model Aviation 7AAJSMWFR JOWPI4nCAJ I L4MvE77 /00 MW WALK/C -7SKIE zzo7sMiqJ 2 bvoW JAPer 7 724o MiV %4c~c/sww4 2-CMJAEL a/G8V 754oAwc3d/q 8Coc/S4LswA ZVAAM/El z4V 7$~4ovA3V4 eM MN 240 4 4 fuel prices going up almost day makes sense add return line fuel pump system catch end re-use overflow saves grass sez George MORE GOsame powerYELLOW ~eePROPELLEFB de o9 Taco 5354h aP9oBlade63 6-4 er74 76 78 5O zeeach8486 88 65 \ a6364104106 86 8-611-411-611-81 86889-6 106 1 128AC124 961063 BladeTractorT25126 iso 104 1606-3 64 GRISH ushee3 Blade Pusher Metallici5o63 504 ST JOHN BROS INDIANA 46373 R C Technique/Myers continued page 16 Knowing servo should moving smoothly between limits have set internal potentiometers stick ing intermittent action unequal speeds two directions must caused defects within servo device also useful building manual posi tion switch transfers control servo knob front panel al lows examine installations interferences binding still workbench necessary tools deal problem Finally after servicing servo al ways good idea set automatic cycling few minutes let new problems appear Its surprising trash can collect inside freshly-repaired servo Chief among culprits bits steel attracted magnet servo-motor Ace Servo Cycle pro vides both positive negative control pulses instructions include ex tensive list proper pulse various manufacturers should able service practically servo market modification found useful addition 5-terminal soldering lug makes addition pigtails new servo types simple matter used scheme output side avoid short ccuit problems would generateo group parallelconnected exposed-pin plugs bat tery-pack side folks building servo-reversers use R100KCl MF RT whatever has to center servo Start 1 Meg work down George M Myers 70 Froehlich Farm Rd Hicks yule NY 11801 Stiletto/McDonald continued page 32 around pushrod washer will applied Next cut small section washer pliers gently com press washer groove solder pushrod fairleads should made plywood just loose enough pushrod can move freely Allowed too much freedom fairlead pushrod will rattle isnt good because its hard look cool airplane sounds like its falling apart Vince set up engines Les Building engine simple Get ting run exactly way want another story best running engines ever never disas sembled cleaning build motors maybe yes maybe no style After engine disassembled wet sand inside case 320 50 sleeve will slide easily position Drill ing spray bar hole tapping muf fler mount other changes outside should done point relocate needle valve just ahead stock ar rangement passes through center venturi about 5/ above center line allows motor run bit faster inverted Ill explain later venturis obtain set Bob Wilder 2010 Boston Street Irving Texas 75061 260 270 275 280 will good variety drill out mount holes file lugs can shift engine around offset need Im trimming have really space age method fitting ring Push sleeve square up piston remove piston start looking hold front bright light can see gaps tween ring sleeve rotate ring few degrees time keep checking cant detect light leaks care fully box up parts send because youve got first class fit Anyway just keep going through rings until find fits well Always bear mind sleeve might perfectly round different rings keep showing gap position sleeve try another sleeve end gap should about 006 isnt much considering sheet paper usually about 003 After deciding ring sleeve Im going use carefully deburr inside ring piston land Xacto knife new Supertigres use full circle crank aluminum stuffing band has known fly off engine grossly overheated actual case ofthisl know Sunday RC incident refuse discuss further en gine seems run same with out decide remove thing cause Murphys Law part substitute front bearing replace Consolidated EL-7-ZZ rear shield removed Last year engine just wouldnt run long enough test stand noticed what seemed quite bit fuel coming out under drive washer simply installing plastic shield bearing picked up 15 seconds running time Just make sure everything okay run engine about 15 20 minutes bench also allows tighten head backplate screws motor warm should take about 20 flights decide engine worthwhile its right youll know Wynn What procedures follow trimming new airplane Les Trying get new model trimmed hassle degree hassle depends Prop Drive Big Airplanes Specifically de signed accept 60-size engines Du-Bro prop drive will fit engine t will easily power airplanes weighing much 30 lbs Thisdevelopment definite break through RPM range 600 6000 depending engine prop used20- 22- 24-in wood props available Grish Bros Appli cations myriad example large scale models movement afoot aiming Ia-in Scale event ultra-big old-timers other models large cowlsas well overall size weightmade impossible huge 8ud Nosen scale kits similar obviously will benefit greatly Slow powerful flight will prove especially realistic gearing downa double belt drive utilizedan effective boost thrust real ized big propellers being sensi bly related size craft achieve truly effective performance levels Price $10000 less engine prop Du-Bro Pro ducts Inc Wauconda IL 60084 product review product review product review 84 Model Aviation product review product review product review