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Radio Control: Electrics

Author: B. Kopski


Edition: Model Aviation - 1999/10
Page Numbers: 102, 103, 104

RADIO CONTROL ELECTRICS U t1 U W1 1z4 4 W U'foI- T U V THIS MONTHS column shares new findings Sport Speed Control SSC follows up recent product info offers circuit assembly aid continues ongoing discussion already aeromodelers would like try E-power issue includes final installment two-part Sport Speed Control articlea build-it-yourself project E-modelers have some electronic assembly experience Developed during several years SSC offered manyfeatured robust design evidence supporting latter data Ive taken SSC temperature behavior Perhaps harsh application among numerous SSCs aerobatic Senior Skyvolt see 2/99 column wherein have 12-cell 15 geared installation plus three midsize servos using SSC BEC Battery Eliminator Circuit option Ive described SSC use up 16 cells up 12 BEC used BEC operation cells larger and/or numerous active servos heating-intensive combination regulator device speed control SSC aluminum plate common heat collector motor control semiconductors BEC regulator its collective heat equalizer speed control Ive known long time simple touch SSC working well above application got curious about detail thermal behavior attached LM34DZ temperature sensor middle heat-sink location SSC read temperature before after eight flights spread over several days average temperature rise above ambient 4980 temperature 900 field SSC plate would rise about 1400 end flight Typical flights eight minutes outcome very good Im comfortable limited temperature increase during such BEC-driven fairly long aerobatic exposure during time throttle servos well-exercised SSC installation optimum location low floor behind elevated motor mount plate underneath airstream passing motor motor pack another experiment prompted inquiry has already built SSC installed SSC REVOLT direct drive 40 18 cells clearly exceeds earlier-stated 16-cell limit SSC installation has operated very well 16 flights date seems original 16-cell limit bit conservative subjected SSC bench exercise using high-current power supply set 22 volts 40 direct-drive 10 x 6 test stand used same temperature sensor technique above BEC wrapped SSC inch foam maximize make bad possible purpose temperature environment recommended flight Iran up motor slow steps during 16-minute period time reached motor input condition 18 volts 27 amps motor very hot SSC baseplate temperature 1220 shop ambient 740 just fine SSC performs thermally good margin 12-cell BEC powered aerobatic applications far 8-cell 40-size application BEC As time goes Ill look carefully expanding SSC limits operation now first-stated application range recommendation six 16 cells herein adjusted six 18 cells based info above excellent safe operation BEC up 12 cells reaffirmed hard data SSCs built described article astute readers have followed SSC article column yes 18-cell test operates SSC just past adjustment range motor cutoff circuit operation maxtmum range R52 puts cutoff value about 87 volts per cell 18 cells instead preferred 9-volt number major matter since original choice somewhat arbitrary Nevertheless Ill address issue future 102 Model Aviation ve electronics builder Five Radio Shack watt carbon resistors $49 100 Tech America $1 Radio Shack 22-168a DMM PC interface cable typical An easy-to-make parts-holder simple cheap its big printout 10-cell charge characteristic recorded help projects such Sport Speed Control Recent columns have included references Tech America Tandy company parts supplier DMM Digital Multi-Meter Radio Shack photo shows two packets -watt 5% carbon resistors such used SSC article five-resistor packet costs 49tt Radio Shack also Tandy company 100-piece resistor packet TA costs $1 Both regular sale prices both single value packets Active circuit builders will surely appreciate price difference offer support earlier claim TA does offer very good pricing some items Another photo shows previously-mentioned Radio Shack 22168a DMM PC interface As writing RSs top-ofthe-line instrument includes normal ranges/features typical DMM adds functions such capacitance frequency transistor gain DMMs real departure normal optional interconnectibility PC photo shows removable cable used printed-out PC capture 10-cell battery charge curve peak detect/cutoff operation charger used sounds intimidating can assure software easy install chose Windows version over DOS alternative snap operate software PC/meter interconnect cable included DMM theres nothing extra buy acquired data can stored recalled imported spreadsheet etc future use considering DMM versatility sounds useful Radio Shack 22-1 68a good choice Radio Shack puts sale periodically Since readers like build electronic things photo shows way handle parts safe organized manner during project parts holder consists two pieces corrugated cardboard 1 inches high other two inches high pieces glued front back re pine stick respectively assembly five inches long sprayed white Krylon paint toughen paper white-glued assembly piece black antistatic foam Radio Shack 276-2400 cut inch width exact dimensions critical careful choice cardboard can Look light duty cardboard box corrugation paper weave between outer paper sides dense ie has small openings idea physically small part body such /4-watt resistor should drop through corrugation passive leaded part can neatly held ready easy fingertip selection its tempting use corrugated slots also hold active device leads antistatic foam pad better choice October1999 103 Kirby Kishs Speedy Bee uses MEG Turbo 10 PIus 61 gears 102000 mAh Sanyo 12 x 8 MAS prop MEG MX-50 BEG IIIIIIIIII First Freedom Speech Freedom Press now theres. FREEDOM FROM FREIGHT Its Revolutionary New Way Buy Engine ReDlacement Bearings Now can call Boca Bearing toll free anywhere US Canada order two tive ten hundred bearings inventory over million bearings never pay dime shipping handling Standard High Sneed High Heat Bearings 500 Engines Stock AND SHIPPING IS FREE TOLL FREE PHONE 800-332-3256 FREE FAX 800-409-9191 7040 W Palmetto Park Rd Suite 2304 Raton Florida 33433 USA Phone 561-998-0004 561-998-0119 Email bearinggatenet http//wwwbocabearingscam ALSO AVAiLABLEwwwhobbyliangarcom TEMPEST MkIIX5UJW rti iunuph6063344331 SEA FURYDEALER INQUIRIES INVITED AR HEBnoN KY 41048Orders 5006113860 Transistors MOSFETs diodes ICs etc can stuck foam pad much better Electrostatic Discharge safety inexpensive parts holder allows easy layout parts project preferred order comfortable thereby speeding assembly minimizing dropped lost components component-selection errors miniseries last several columns aimed helping already-aeromodelers try Electric has bringing reader reaction time Ill address flight time sort anything wrong contemporary Electric would running high power long time relative terms todays motors batteries capable outputting power sufficient project high power level long aspect primarily dictated battery Todays best batteries still no match energy associated wetfuel supplies feel time will improve fundamental limitation Motors almost good can dont look much performance improvement Say like fly big wet airplanes full bore 10-15 minutes time fell short flight time could increase fuel capacity airplane probably wouldnt know difference flight time would go up its easy fix problem within wet power its easy Electric Todays best batteries significantly better just 10 years ago still relatively heavy energy levels stored therein adding fuel will probably noticed airplane percentage-wise associated weight significant Doubling wet-fuel tank thing doubling battery capacitywhich typically /3 weight finished aircraftis quite another really want fly big high-power high-performance long flight manner E-power youyet sure about thisits pedal metal 10-15 minutes type flying Im talking about So close does Electric come About three four minutes reasonable repeatable time kind flying Before turn away Electric reason suggest two things First sure about fligbt-time target amazing bow wet fliers dont know long flights typically Ive seen times Electric dont fly long taunt immediately met some defensive stopwatch scrutiny wet-powered flights field Most people dont realize short wet-power flights just seem long So make sure 10- 15-minute flight-time goal real something just feels way Second outcome above time test eye-opener youre really doing vigorous flying half time think consider compromise still tempted Electric ease up first goals go shorter vigorous longer still exciting kind flying choice can lie throttle stick fingers can choose what feel like youre flying Leave throttle wide open land sooner shakier play stick during flight land later still satisfied accept compromise youll still have plenty Electric fun same time poised practiced better timeswhen battery technology finally narrows remaining gap between wet dry Please enclose SASE correspondence youd like reply get E-meet season will inspire 4* * Long Engine Life * * Use BRU LINE Air Cleaner Completely Fuel Proof Nylon Rubber Parts Cat No 102 Air Cleaner Coarse Cat No 202Air Cleaner Fine Replacement Inserts Cat No 104 Pkl2 lnsertsCoarse Cat No 204 Pkl2 Inserts Fine FITS MOST ENGINES 25and UP $299 $299 $239 $239 SEE YOUR LOCAL HOBBY DEALER IF UNAVAILABLE LOCALLY SEND TO Bru Line Industries Inc PO Sox3lSO Center Un. Michigan 48015 Add $250 shipping igan residents add 4% sales tax 104 Model Aviation 4THE BEST 9 cylinder C Series 73 Ounces ubic Inche TECH NOPOWER II INC 610 North Street Chagrin Falls OH 44022 phone 440 564-9787 http//wwwrechnopowercom Complete brochure US $300 other $500 & MC Accepted much aircraft worth Protect investment FLIGHT ALARM $2995 s/h incid 95db @ 3 ftand pulsing alarmwith C-TRONICS Inc PO Box 192 Ramsey NJ 07446 201-818-4289

Author: B. Kopski


Edition: Model Aviation - 1999/10
Page Numbers: 102, 103, 104

RADIO CONTROL ELECTRICS U t1 U W1 1z4 4 W U'foI- T U V THIS MONTHS column shares new findings Sport Speed Control SSC follows up recent product info offers circuit assembly aid continues ongoing discussion already aeromodelers would like try E-power issue includes final installment two-part Sport Speed Control articlea build-it-yourself project E-modelers have some electronic assembly experience Developed during several years SSC offered manyfeatured robust design evidence supporting latter data Ive taken SSC temperature behavior Perhaps harsh application among numerous SSCs aerobatic Senior Skyvolt see 2/99 column wherein have 12-cell 15 geared installation plus three midsize servos using SSC BEC Battery Eliminator Circuit option Ive described SSC use up 16 cells up 12 BEC used BEC operation cells larger and/or numerous active servos heating-intensive combination regulator device speed control SSC aluminum plate common heat collector motor control semiconductors BEC regulator its collective heat equalizer speed control Ive known long time simple touch SSC working well above application got curious about detail thermal behavior attached LM34DZ temperature sensor middle heat-sink location SSC read temperature before after eight flights spread over several days average temperature rise above ambient 4980 temperature 900 field SSC plate would rise about 1400 end flight Typical flights eight minutes outcome very good Im comfortable limited temperature increase during such BEC-driven fairly long aerobatic exposure during time throttle servos well-exercised SSC installation optimum location low floor behind elevated motor mount plate underneath airstream passing motor motor pack another experiment prompted inquiry has already built SSC installed SSC REVOLT direct drive 40 18 cells clearly exceeds earlier-stated 16-cell limit SSC installation has operated very well 16 flights date seems original 16-cell limit bit conservative subjected SSC bench exercise using high-current power supply set 22 volts 40 direct-drive 10 x 6 test stand used same temperature sensor technique above BEC wrapped SSC inch foam maximize make bad possible purpose temperature environment recommended flight Iran up motor slow steps during 16-minute period time reached motor input condition 18 volts 27 amps motor very hot SSC baseplate temperature 1220 shop ambient 740 just fine SSC performs thermally good margin 12-cell BEC powered aerobatic applications far 8-cell 40-size application BEC As time goes Ill look carefully expanding SSC limits operation now first-stated application range recommendation six 16 cells herein adjusted six 18 cells based info above excellent safe operation BEC up 12 cells reaffirmed hard data SSCs built described article astute readers have followed SSC article column yes 18-cell test operates SSC just past adjustment range motor cutoff circuit operation maxtmum range R52 puts cutoff value about 87 volts per cell 18 cells instead preferred 9-volt number major matter since original choice somewhat arbitrary Nevertheless Ill address issue future 102 Model Aviation ve electronics builder Five Radio Shack watt carbon resistors $49 100 Tech America $1 Radio Shack 22-168a DMM PC interface cable typical An easy-to-make parts-holder simple cheap its big printout 10-cell charge characteristic recorded help projects such Sport Speed Control Recent columns have included references Tech America Tandy company parts supplier DMM Digital Multi-Meter Radio Shack photo shows two packets -watt 5% carbon resistors such used SSC article five-resistor packet costs 49tt Radio Shack also Tandy company 100-piece resistor packet TA costs $1 Both regular sale prices both single value packets Active circuit builders will surely appreciate price difference offer support earlier claim TA does offer very good pricing some items Another photo shows previously-mentioned Radio Shack 22168a DMM PC interface As writing RSs top-ofthe-line instrument includes normal ranges/features typical DMM adds functions such capacitance frequency transistor gain DMMs real departure normal optional interconnectibility PC photo shows removable cable used printed-out PC capture 10-cell battery charge curve peak detect/cutoff operation charger used sounds intimidating can assure software easy install chose Windows version over DOS alternative snap operate software PC/meter interconnect cable included DMM theres nothing extra buy acquired data can stored recalled imported spreadsheet etc future use considering DMM versatility sounds useful Radio Shack 22-1 68a good choice Radio Shack puts sale periodically Since readers like build electronic things photo shows way handle parts safe organized manner during project parts holder consists two pieces corrugated cardboard 1 inches high other two inches high pieces glued front back re pine stick respectively assembly five inches long sprayed white Krylon paint toughen paper white-glued assembly piece black antistatic foam Radio Shack 276-2400 cut inch width exact dimensions critical careful choice cardboard can Look light duty cardboard box corrugation paper weave between outer paper sides dense ie has small openings idea physically small part body such /4-watt resistor should drop through corrugation passive leaded part can neatly held ready easy fingertip selection its tempting use corrugated slots also hold active device leads antistatic foam pad better choice October1999 103 Kirby Kishs Speedy Bee uses MEG Turbo 10 PIus 61 gears 102000 mAh Sanyo 12 x 8 MAS prop MEG MX-50 BEG IIIIIIIIII First Freedom Speech Freedom Press now theres. FREEDOM FROM FREIGHT Its Revolutionary New Way Buy Engine ReDlacement Bearings Now can call Boca Bearing toll free anywhere US Canada order two tive ten hundred bearings inventory over million bearings never pay dime shipping handling Standard High Sneed High Heat Bearings 500 Engines Stock AND SHIPPING IS FREE TOLL FREE PHONE 800-332-3256 FREE FAX 800-409-9191 7040 W Palmetto Park Rd Suite 2304 Raton Florida 33433 USA Phone 561-998-0004 561-998-0119 Email bearinggatenet http//wwwbocabearingscam ALSO AVAiLABLEwwwhobbyliangarcom TEMPEST MkIIX5UJW rti iunuph6063344331 SEA FURYDEALER INQUIRIES INVITED AR HEBnoN KY 41048Orders 5006113860 Transistors MOSFETs diodes ICs etc can stuck foam pad much better Electrostatic Discharge safety inexpensive parts holder allows easy layout parts project preferred order comfortable thereby speeding assembly minimizing dropped lost components component-selection errors miniseries last several columns aimed helping already-aeromodelers try Electric has bringing reader reaction time Ill address flight time sort anything wrong contemporary Electric would running high power long time relative terms todays motors batteries capable outputting power sufficient project high power level long aspect primarily dictated battery Todays best batteries still no match energy associated wetfuel supplies feel time will improve fundamental limitation Motors almost good can dont look much performance improvement Say like fly big wet airplanes full bore 10-15 minutes time fell short flight time could increase fuel capacity airplane probably wouldnt know difference flight time would go up its easy fix problem within wet power its easy Electric Todays best batteries significantly better just 10 years ago still relatively heavy energy levels stored therein adding fuel will probably noticed airplane percentage-wise associated weight significant Doubling wet-fuel tank thing doubling battery capacitywhich typically /3 weight finished aircraftis quite another really want fly big high-power high-performance long flight manner E-power youyet sure about thisits pedal metal 10-15 minutes type flying Im talking about So close does Electric come About three four minutes reasonable repeatable time kind flying Before turn away Electric reason suggest two things First sure about fligbt-time target amazing bow wet fliers dont know long flights typically Ive seen times Electric dont fly long taunt immediately met some defensive stopwatch scrutiny wet-powered flights field Most people dont realize short wet-power flights just seem long So make sure 10- 15-minute flight-time goal real something just feels way Second outcome above time test eye-opener youre really doing vigorous flying half time think consider compromise still tempted Electric ease up first goals go shorter vigorous longer still exciting kind flying choice can lie throttle stick fingers can choose what feel like youre flying Leave throttle wide open land sooner shakier play stick during flight land later still satisfied accept compromise youll still have plenty Electric fun same time poised practiced better timeswhen battery technology finally narrows remaining gap between wet dry Please enclose SASE correspondence youd like reply get E-meet season will inspire 4* * Long Engine Life * * Use BRU LINE Air Cleaner Completely Fuel Proof Nylon Rubber Parts Cat No 102 Air Cleaner Coarse Cat No 202Air Cleaner Fine Replacement Inserts Cat No 104 Pkl2 lnsertsCoarse Cat No 204 Pkl2 Inserts Fine FITS MOST ENGINES 25and UP $299 $299 $239 $239 SEE YOUR LOCAL HOBBY DEALER IF UNAVAILABLE LOCALLY SEND TO Bru Line Industries Inc PO Sox3lSO Center Un. Michigan 48015 Add $250 shipping igan residents add 4% sales tax 104 Model Aviation 4THE BEST 9 cylinder C Series 73 Ounces ubic Inche TECH NOPOWER II INC 610 North Street Chagrin Falls OH 44022 phone 440 564-9787 http//wwwrechnopowercom Complete brochure US $300 other $500 & MC Accepted much aircraft worth Protect investment FLIGHT ALARM $2995 s/h incid 95db @ 3 ftand pulsing alarmwith C-TRONICS Inc PO Box 192 Ramsey NJ 07446 201-818-4289

Author: B. Kopski


Edition: Model Aviation - 1999/10
Page Numbers: 102, 103, 104

RADIO CONTROL ELECTRICS U t1 U W1 1z4 4 W U'foI- T U V THIS MONTHS column shares new findings Sport Speed Control SSC follows up recent product info offers circuit assembly aid continues ongoing discussion already aeromodelers would like try E-power issue includes final installment two-part Sport Speed Control articlea build-it-yourself project E-modelers have some electronic assembly experience Developed during several years SSC offered manyfeatured robust design evidence supporting latter data Ive taken SSC temperature behavior Perhaps harsh application among numerous SSCs aerobatic Senior Skyvolt see 2/99 column wherein have 12-cell 15 geared installation plus three midsize servos using SSC BEC Battery Eliminator Circuit option Ive described SSC use up 16 cells up 12 BEC used BEC operation cells larger and/or numerous active servos heating-intensive combination regulator device speed control SSC aluminum plate common heat collector motor control semiconductors BEC regulator its collective heat equalizer speed control Ive known long time simple touch SSC working well above application got curious about detail thermal behavior attached LM34DZ temperature sensor middle heat-sink location SSC read temperature before after eight flights spread over several days average temperature rise above ambient 4980 temperature 900 field SSC plate would rise about 1400 end flight Typical flights eight minutes outcome very good Im comfortable limited temperature increase during such BEC-driven fairly long aerobatic exposure during time throttle servos well-exercised SSC installation optimum location low floor behind elevated motor mount plate underneath airstream passing motor motor pack another experiment prompted inquiry has already built SSC installed SSC REVOLT direct drive 40 18 cells clearly exceeds earlier-stated 16-cell limit SSC installation has operated very well 16 flights date seems original 16-cell limit bit conservative subjected SSC bench exercise using high-current power supply set 22 volts 40 direct-drive 10 x 6 test stand used same temperature sensor technique above BEC wrapped SSC inch foam maximize make bad possible purpose temperature environment recommended flight Iran up motor slow steps during 16-minute period time reached motor input condition 18 volts 27 amps motor very hot SSC baseplate temperature 1220 shop ambient 740 just fine SSC performs thermally good margin 12-cell BEC powered aerobatic applications far 8-cell 40-size application BEC As time goes Ill look carefully expanding SSC limits operation now first-stated application range recommendation six 16 cells herein adjusted six 18 cells based info above excellent safe operation BEC up 12 cells reaffirmed hard data SSCs built described article astute readers have followed SSC article column yes 18-cell test operates SSC just past adjustment range motor cutoff circuit operation maxtmum range R52 puts cutoff value about 87 volts per cell 18 cells instead preferred 9-volt number major matter since original choice somewhat arbitrary Nevertheless Ill address issue future 102 Model Aviation ve electronics builder Five Radio Shack watt carbon resistors $49 100 Tech America $1 Radio Shack 22-168a DMM PC interface cable typical An easy-to-make parts-holder simple cheap its big printout 10-cell charge characteristic recorded help projects such Sport Speed Control Recent columns have included references Tech America Tandy company parts supplier DMM Digital Multi-Meter Radio Shack photo shows two packets -watt 5% carbon resistors such used SSC article five-resistor packet costs 49tt Radio Shack also Tandy company 100-piece resistor packet TA costs $1 Both regular sale prices both single value packets Active circuit builders will surely appreciate price difference offer support earlier claim TA does offer very good pricing some items Another photo shows previously-mentioned Radio Shack 22168a DMM PC interface As writing RSs top-ofthe-line instrument includes normal ranges/features typical DMM adds functions such capacitance frequency transistor gain DMMs real departure normal optional interconnectibility PC photo shows removable cable used printed-out PC capture 10-cell battery charge curve peak detect/cutoff operation charger used sounds intimidating can assure software easy install chose Windows version over DOS alternative snap operate software PC/meter interconnect cable included DMM theres nothing extra buy acquired data can stored recalled imported spreadsheet etc future use considering DMM versatility sounds useful Radio Shack 22-1 68a good choice Radio Shack puts sale periodically Since readers like build electronic things photo shows way handle parts safe organized manner during project parts holder consists two pieces corrugated cardboard 1 inches high other two inches high pieces glued front back re pine stick respectively assembly five inches long sprayed white Krylon paint toughen paper white-glued assembly piece black antistatic foam Radio Shack 276-2400 cut inch width exact dimensions critical careful choice cardboard can Look light duty cardboard box corrugation paper weave between outer paper sides dense ie has small openings idea physically small part body such /4-watt resistor should drop through corrugation passive leaded part can neatly held ready easy fingertip selection its tempting use corrugated slots also hold active device leads antistatic foam pad better choice October1999 103 Kirby Kishs Speedy Bee uses MEG Turbo 10 PIus 61 gears 102000 mAh Sanyo 12 x 8 MAS prop MEG MX-50 BEG IIIIIIIIII First Freedom Speech Freedom Press now theres. FREEDOM FROM FREIGHT Its Revolutionary New Way Buy Engine ReDlacement Bearings Now can call Boca Bearing toll free anywhere US Canada order two tive ten hundred bearings inventory over million bearings never pay dime shipping handling Standard High Sneed High Heat Bearings 500 Engines Stock AND SHIPPING IS FREE TOLL FREE PHONE 800-332-3256 FREE FAX 800-409-9191 7040 W Palmetto Park Rd Suite 2304 Raton Florida 33433 USA Phone 561-998-0004 561-998-0119 Email bearinggatenet http//wwwbocabearingscam ALSO AVAiLABLEwwwhobbyliangarcom TEMPEST MkIIX5UJW rti iunuph6063344331 SEA FURYDEALER INQUIRIES INVITED AR HEBnoN KY 41048Orders 5006113860 Transistors MOSFETs diodes ICs etc can stuck foam pad much better Electrostatic Discharge safety inexpensive parts holder allows easy layout parts project preferred order comfortable thereby speeding assembly minimizing dropped lost components component-selection errors miniseries last several columns aimed helping already-aeromodelers try Electric has bringing reader reaction time Ill address flight time sort anything wrong contemporary Electric would running high power long time relative terms todays motors batteries capable outputting power sufficient project high power level long aspect primarily dictated battery Todays best batteries still no match energy associated wetfuel supplies feel time will improve fundamental limitation Motors almost good can dont look much performance improvement Say like fly big wet airplanes full bore 10-15 minutes time fell short flight time could increase fuel capacity airplane probably wouldnt know difference flight time would go up its easy fix problem within wet power its easy Electric Todays best batteries significantly better just 10 years ago still relatively heavy energy levels stored therein adding fuel will probably noticed airplane percentage-wise associated weight significant Doubling wet-fuel tank thing doubling battery capacitywhich typically /3 weight finished aircraftis quite another really want fly big high-power high-performance long flight manner E-power youyet sure about thisits pedal metal 10-15 minutes type flying Im talking about So close does Electric come About three four minutes reasonable repeatable time kind flying Before turn away Electric reason suggest two things First sure about fligbt-time target amazing bow wet fliers dont know long flights typically Ive seen times Electric dont fly long taunt immediately met some defensive stopwatch scrutiny wet-powered flights field Most people dont realize short wet-power flights just seem long So make sure 10- 15-minute flight-time goal real something just feels way Second outcome above time test eye-opener youre really doing vigorous flying half time think consider compromise still tempted Electric ease up first goals go shorter vigorous longer still exciting kind flying choice can lie throttle stick fingers can choose what feel like youre flying Leave throttle wide open land sooner shakier play stick during flight land later still satisfied accept compromise youll still have plenty Electric fun same time poised practiced better timeswhen battery technology finally narrows remaining gap between wet dry Please enclose SASE correspondence youd like reply get E-meet season will inspire 4* * Long Engine Life * * Use BRU LINE Air Cleaner Completely Fuel Proof Nylon Rubber Parts Cat No 102 Air Cleaner Coarse Cat No 202Air Cleaner Fine Replacement Inserts Cat No 104 Pkl2 lnsertsCoarse Cat No 204 Pkl2 Inserts Fine FITS MOST ENGINES 25and UP $299 $299 $239 $239 SEE YOUR LOCAL HOBBY DEALER IF UNAVAILABLE LOCALLY SEND TO Bru Line Industries Inc PO Sox3lSO Center Un. Michigan 48015 Add $250 shipping igan residents add 4% sales tax 104 Model Aviation 4THE BEST 9 cylinder C Series 73 Ounces ubic Inche TECH NOPOWER II INC 610 North Street Chagrin Falls OH 44022 phone 440 564-9787 http//wwwrechnopowercom Complete brochure US $300 other $500 & MC Accepted much aircraft worth Protect investment FLIGHT ALARM $2995 s/h incid 95db @ 3 ftand pulsing alarmwith C-TRONICS Inc PO Box 192 Ramsey NJ 07446 201-818-4289

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