GeorgeMMye Radio Thchnque 70 Froeblich Farm Rd Hicksvlile NY 11801 ABSTRACT George Steiners procedure us ing ICOM IC-R7000 receiver spot check transmitter sidebands given IT AINT CHEAP cheaper used Contest Director RC meet wanted scanner order able verify flag contestants transmitter matched transmitters operating frequency Now he/she may want verify transmitter power levels well AMA rule book authorizes Contest Director make whatever measurements nec essary insure he/she able conduct contest doesnt create unnecessary risks contestants What tool makes mea surements possible Section 34 AMA Guidelines Narrow-Band Operation 72-75 MHz Radio Control Frequencies' hereafter called AMA Guidelines published September October 1987 editions AMA News calls transmitter frequency tolerance 1500 cycles 72 MHz band AMA Guideline narrow-band trans mitter calls 55 dB F0 ±20 kHz re quires three discrete power level measurements transmitters operating frequency frequencies 20 kHz away transmitters operating frequency Obviously need way measure fre quency accurately way measure power discrete frequency requires three things 1 need frequency measuring device should traceable accuracy back National Bureau Standards NBS should have frequency stability better 10 parts per million 72 MHz 10 ppm signal may drift 72 x 10 Hz tween measurements need something better 2 need narrow-band receiver sepa rate power specific band frequencies rest power being transmit ted Note speak band offtequen cies power discrete frequency no simple way measure power discrete frequency though may talk about doing 3 need power meter Ideally should measure absolute power traceable back NBS practise can learn need know relative-power meter such meters lot easier obtain less $1000 can buy machine serves functions frequencymeasuring meter programmable frequency stepping scanning receiver relative-power meter also has other functions arent interested right now machine refer ICOM IC-R7000 VHF/UHF General Coverage receiver available sources supply Amateur Radio crowd will mention Electronic Equipment Bank 516 Mill Street NE Vienna VA 22180 telephone 1-800-368-3270 because am looking catalog write column dimensions unit 4% H x 111/4 W x 10% D weight 16 lb power requirement 117/235 VAC optional 12 VDC Audio output 2 watts Sensitivity better 05 microvolts 10 dB SINAD frequency coverage 251000 MHz stability 5 ppm 10 600 Centigrade after one-hour warm-up Now before start writing letters about price am retired limited income $1000 lot money too question YOU have answer impor tant to make measurements Using ICOM IC-R7000 Procedure follows has worked Out veri 34 Model Aviation George P Steiner adjusting IC-R7000 shop ICOM receiver nesties between spectrum analyzer pile other test equipment Modelers Sacramento CA area truly blessed have George available care radio equipment ICOM IC-R7000 receiver L antenna attached isa portable unit note handle left side case works 110 VAC 12 VDC rear view unit R long pointer denoting FM1IFM2 switch Theres lots info column Correction March 1988 Radio Technique col umn George Myers page 34 said RCMA Radio Control Manufactur ers Association AMA involved joint effort certify transmitters using gold silver stickers seals indicate narrow-band wideband operation also said converted new fre quency OWBAM Old Wideband AM transmitter MUST have RCMA gold seal order sanctioned use AMA com petition low-band channels RCJ234 silver seal restricts transmitter high band channels RC3856 Additionally said eal should bar uses including sport flying last sentence definitely opinion rather fact two earlier quotes incorrect follows 1 AMA RCMA certifying transmitters basic objective check transmitters service modelers determine transmitters will suitable operation 1988 environment includes both narrow-band wideband op erations also provides means deter mining extent possible problems narrow-band program fully phased 1991 2 no current requirement transmitter have gold silver sticker Lack sticker does mean trans mitter banned kind flying However AMA Executive Council agrees current recommendation AMA Frequency Committee can expect stickers will required fly RC sanc tioned competition beginning 1989 Mean AMA recommends clubs consider adopting similar requirement club field operations summary gold silver stickers currently required AMA rec ommended means providing confi dence narrow-band frequency imple mentation plan will work Regardless stickers narrow-band trans mitters may now used AMA-sanctioned events channels RC12-34 inclusive per item 49 page 10 1988 AMA Member ship Manual Point clarification club requires trans mitters have sticker order used club field would club rule club rules automatically part AMA Safety Code General section item 3 Official AMA Safety Code ap plies clubs operations information provided help reduce confusion March article caused ev idenced phone calls letters AMA HQ also comments AMA members trade shows Normally Model Aviation mag azine columns scanned advance pub lication screen out information might incorrect misleading case screening process glitch wrong words got out apolog ize can help us set record straight passing information described fled agalnst spectrum analyzer George P Steiner am merely reporter 1 Test setup am now going assume have receiver receiver manual B&P Associates Gives Total Flight Line FREEDOM new electnc starter battery pack cuts cord has always tied starter power panel Discover freedom being able start plane wherever added safety less wire get caught prop charge hefty 4 Amp/hour pack will take through weekend flying power enough spare dont stop have Ni-Cads virtually size imaginable cut experimenter free design whatever takes make yours best setup field June 1988 35 *475AVAILABLE AT AMERICAS470 DISTRIBUTED BY FINEST HOBBY SHOPS 5MflflHI RED WE WZZDE 7560 Sat GobeI Road eo CA 83422 486-1717 battery needs- write B&P Associates PO Box 22054 Waco TX 76702-2054 817662-5587 * 7 Giant Scale Sheets * 60 Size Sheets * 40 Size . heets * Propeliw Decais WT 6 Shoots -3 sizes * Kill Markings 12 Sheets * Nomenclature Markings 3 Sizon -12 Sheets Black White copy * Letters Numbers 1 2344-13/16 10 Colors * Stan 10 Colors 11 SIzes plus Shoot ot Aesorted Sizes Major Decal pass flying colors DISTRIBUTORS INQUIRIES INVITED Call Paul Major 413 525-4110 ma7or decal Custom decal Manufacturer. L NORTHEAST SCREEN GRAPHICS 21 FISHER AVE EAST LONGMEADOW MA 01023 TEl 413-525-411g hand can read Further will assume thaE have read manual operated re ceiver enough Eo know Eo use jE will describe Ehe things special Ehis Eest test setup should wooden table a Connect 50-ohm unbalanced antenna BNC jack back ICOM receiver extend iE its full length antenna should supported vertically test table should fully extended b Place RC transmitter want measure table its antenna fully ex tended parallel receiver antenna about three feet 2 Set up switches a Referring Figure 1 make sure FMl/FM2 switch back panel FM1 position gives narrowest bandwidth re ceiver 6 dB F0 ±3 kHz b Select FM RH panel c Set RF Gain nine oclock position Squelch 12 oclock 3 Turn IC-R7000 needs oper ation about hour before make first measurements order provide stable re peatable measurements 4 Turn transmitter tested batteries should fully charged tenna should fully extended 5 Tune receiver transmitter frequen cy a Put meter switch C position find frequency Check needle swings about cale rock tuning knob b Put meter switch 5 position slide test transmitter around table until meter reads 40 What doing finding distance between two anten nas will produce 40 reference dial reading 6 Check sidebands Without changing test transmitter position rotate tuning knob change frequency display 20 kHz ie Raise lower displayed number 200 Note meter reading both positions a If needle goes position between 1 6 dial transmitter narrowband may rate Gold sticker use chan nels RCl2 through RC34 b If needle goes position between 6 10 dial transmitter wideband would rate Silver sticker would suitable channels RC38 through RC56 c If needle goes position between 10 60 dial transmitter doesnt rate sticker Repeat steps 4 through 6 new transmit ter want test havent discussed calibration ICOM IC R7000 Calibration particular business should done persons having right equipment plenty experience matter ways can make errors calibra tion process far too numerous discussion column type Suffice say two instruments known calibrated new found match above statements Another instrument checked after being service year calibration ter changed 10% result cali bration shift transmitters actually rated Gold sticker would have reported rate Silver sticker ICOM R7000 receiver good enough use scanner find identify transmissions RC bands except 27MHz band Continued page 128 36 Model Aviation r NO MORE KICKBACKS THROWN PROPS popular best selling odd-on ignition system world Convert engine spark ignition breakerless capacitive discharge Ignition System can installed engines 60 up both 2 & 4 stroke both single & twin cylinders 4-strokers run absolutely beautiful ignition 10 30% power 4-strobe engine No kick-heck throwing props Absolutely no pre-detonetion death 4-stroke engines Much lower priced feel & no rusty hearings commercial fuel available Red-Mex Very low 900-1000 rmp reliable idle end easy hand starts can control ignition timing will stop pro-detonation engine will russ mudi cooler develop power Now available conqaletely shielded sperk plug lead 90 plug cover Chosen TLG Mfg Byron Originals Its outstanding reliability Send St 00 price list newsletter ordering Box 1732 Riverton WY 82501 307 857-6897 CH Electronics Inc j WANNA RACE NORTHEAST AREA a BEGINNER RACES O-5oo FORM-i * FAI Instructions Club Programs Information Contact NORTH EAST PYLON RACING ORGANIZATION 119 DEAN AVEFRANKLIN MASS 02038 Tel 617 528-4043 203 673 -2000 altitude about 200 ft realized absolutely no control whatsoever model went left-hand spiral dive resulting impact macadam runway drove OS 30s crankshaft Out through rear crankcase cover turned model yellow Cover ite bag balsawood Also GI Joe pilot lost headbut lived fly again Other having stripped gears servos radio functioned flawlessly after crash So theory about loss control partially disconnected receiver battery pack stuffed rearward tempt shift CG time didnt bother tape radio connectors engine vibration took care rest disconnection So never did find out whether rearward CG shift would have improved J-3s spin entries did learn secure connectors tape fu ture models fly alone fly alone number readers sent letters commented Plane bites man story March 1988 column concerned incident modeler struck seriously injured own plane advice also Never fly alone Apparently lot out dont subscribe advice Most seem feel because no flying site wont suffer injury loss model because someone elses mistake Similarly mistake does jeopardize someone elses safety may true being hit model frequent cause injury Feeding fingers through own models prop com mon cause injury Driving car hand easy may impossible other hand being used stop flow blood Flying untested Scale models recent letter Del Rykert Batavia NY expressed con cern about numerous occasions wherein has seen modelers enter Scale contest model hadnt tested airworthiness Del asked opinion prevent such flagrant violation safety Unfortunately didnt have simple solution offer Del thinks Scale modelers reluctant test fly new model prior entering contest cause want save static judging such case suggests solution may reverse current order judging such fly first have static judging last As stated response Del dont have good feel prevalent problem Thats Im mentioning asking input Scale modelers have real safety problem untested models being flown Scale contests what solution MariahlTriebes Continued page 33 ing point may wish adjust bal ance fit own flying style come accustomed Mariah Sailplane likes fly fast smooth Mariah has full aerobatic cap abilities extremely stable aircraft speeds swept wing keeps plane highly stable during slow flight slows down very well landing need spoilers flaps said done impor tant thing have funand some exhilarating slope flying Ive experi enced has little Sailplane Mariah may best Soarer Ive ever flown shes definitely right up first rank Try yourself youre bound agree Radio Technique/Myers Continued page 36 can accurate enough find transmitters outside AMA frequency tolerances comes measuring power levels really isnt good enough installing Gold Silver stickers paragraph 322 AMA Guidelines requires spectrum analyzer used purpose think ICOM good enough reveal illegal crystal swappingand Contest Director really wants know about RC Giant Scale/de Vries Continued page 41 bewildering Some efficient othersthey convert same amount gas glow fuel power per cubic inch Thus some installations may able get away smaller engine just because efficient others its displacement range too hobby shops distributors carry available engines engine choice may depend availability cost factors other considerations proper propeller can make break spe cific engine great prop efficiency viewpoint may turn competent engine raging tiger Flight altitude included list engine choice factors primarily because its BIG amongst us Rocky Mountains Just cause fly altitudes 5000 7000 ft above sea level know going lose 20% engines power before props spun Conversely fly sea level en gine going put out its full power Since concerned scale outlines ten engine choose determined de sire keep within confines cowling best criteria lot us dont like bunch iromnongery disrupting scale lines models Hence inclined choose physically smaller engine might appropriate power-required view point Finally often consideration brand loyalty weve successful product particular manufacturer dined buy another engines Nothing wrong criterionas long favor ite manufacturer produces range power plants Andyou can choose suitable model Engine choice very personal thing can listen pronouncements experts theyre frequently right can follow rec ommendations models designerafter hes flown model specific engine size push comes shove youll have de cide engine use youll have early building sequence Itll take lot thought consideration final note may interest movers shakers AMA clubs IMAA chapters Jim Jennings Jennings Trophy Sales PO Box 1121 Hendersonville 128 Model Aviation ZIVIA Name Street Addreas City StateZip HoWW RNATIONAL INC
Edition: Model Aviation - 1988/06
Page Numbers: 34, 35, 36, 128
GeorgeMMye Radio Thchnque 70 Froeblich Farm Rd Hicksvlile NY 11801 ABSTRACT George Steiners procedure us ing ICOM IC-R7000 receiver spot check transmitter sidebands given IT AINT CHEAP cheaper used Contest Director RC meet wanted scanner order able verify flag contestants transmitter matched transmitters operating frequency Now he/she may want verify transmitter power levels well AMA rule book authorizes Contest Director make whatever measurements nec essary insure he/she able conduct contest doesnt create unnecessary risks contestants What tool makes mea surements possible Section 34 AMA Guidelines Narrow-Band Operation 72-75 MHz Radio Control Frequencies' hereafter called AMA Guidelines published September October 1987 editions AMA News calls transmitter frequency tolerance 1500 cycles 72 MHz band AMA Guideline narrow-band trans mitter calls 55 dB F0 ±20 kHz re quires three discrete power level measurements transmitters operating frequency frequencies 20 kHz away transmitters operating frequency Obviously need way measure fre quency accurately way measure power discrete frequency requires three things 1 need frequency measuring device should traceable accuracy back National Bureau Standards NBS should have frequency stability better 10 parts per million 72 MHz 10 ppm signal may drift 72 x 10 Hz tween measurements need something better 2 need narrow-band receiver sepa rate power specific band frequencies rest power being transmit ted Note speak band offtequen cies power discrete frequency no simple way measure power discrete frequency though may talk about doing 3 need power meter Ideally should measure absolute power traceable back NBS practise can learn need know relative-power meter such meters lot easier obtain less $1000 can buy machine serves functions frequencymeasuring meter programmable frequency stepping scanning receiver relative-power meter also has other functions arent interested right now machine refer ICOM IC-R7000 VHF/UHF General Coverage receiver available sources supply Amateur Radio crowd will mention Electronic Equipment Bank 516 Mill Street NE Vienna VA 22180 telephone 1-800-368-3270 because am looking catalog write column dimensions unit 4% H x 111/4 W x 10% D weight 16 lb power requirement 117/235 VAC optional 12 VDC Audio output 2 watts Sensitivity better 05 microvolts 10 dB SINAD frequency coverage 251000 MHz stability 5 ppm 10 600 Centigrade after one-hour warm-up Now before start writing letters about price am retired limited income $1000 lot money too question YOU have answer impor tant to make measurements Using ICOM IC-R7000 Procedure follows has worked Out veri 34 Model Aviation George P Steiner adjusting IC-R7000 shop ICOM receiver nesties between spectrum analyzer pile other test equipment Modelers Sacramento CA area truly blessed have George available care radio equipment ICOM IC-R7000 receiver L antenna attached isa portable unit note handle left side case works 110 VAC 12 VDC rear view unit R long pointer denoting FM1IFM2 switch Theres lots info column Correction March 1988 Radio Technique col umn George Myers page 34 said RCMA Radio Control Manufactur ers Association AMA involved joint effort certify transmitters using gold silver stickers seals indicate narrow-band wideband operation also said converted new fre quency OWBAM Old Wideband AM transmitter MUST have RCMA gold seal order sanctioned use AMA com petition low-band channels RCJ234 silver seal restricts transmitter high band channels RC3856 Additionally said eal should bar uses including sport flying last sentence definitely opinion rather fact two earlier quotes incorrect follows 1 AMA RCMA certifying transmitters basic objective check transmitters service modelers determine transmitters will suitable operation 1988 environment includes both narrow-band wideband op erations also provides means deter mining extent possible problems narrow-band program fully phased 1991 2 no current requirement transmitter have gold silver sticker Lack sticker does mean trans mitter banned kind flying However AMA Executive Council agrees current recommendation AMA Frequency Committee can expect stickers will required fly RC sanc tioned competition beginning 1989 Mean AMA recommends clubs consider adopting similar requirement club field operations summary gold silver stickers currently required AMA rec ommended means providing confi dence narrow-band frequency imple mentation plan will work Regardless stickers narrow-band trans mitters may now used AMA-sanctioned events channels RC12-34 inclusive per item 49 page 10 1988 AMA Member ship Manual Point clarification club requires trans mitters have sticker order used club field would club rule club rules automatically part AMA Safety Code General section item 3 Official AMA Safety Code ap plies clubs operations information provided help reduce confusion March article caused ev idenced phone calls letters AMA HQ also comments AMA members trade shows Normally Model Aviation mag azine columns scanned advance pub lication screen out information might incorrect misleading case screening process glitch wrong words got out apolog ize can help us set record straight passing information described fled agalnst spectrum analyzer George P Steiner am merely reporter 1 Test setup am now going assume have receiver receiver manual B&P Associates Gives Total Flight Line FREEDOM new electnc starter battery pack cuts cord has always tied starter power panel Discover freedom being able start plane wherever added safety less wire get caught prop charge hefty 4 Amp/hour pack will take through weekend flying power enough spare dont stop have Ni-Cads virtually size imaginable cut experimenter free design whatever takes make yours best setup field June 1988 35 *475AVAILABLE AT AMERICAS470 DISTRIBUTED BY FINEST HOBBY SHOPS 5MflflHI RED WE WZZDE 7560 Sat GobeI Road eo CA 83422 486-1717 battery needs- write B&P Associates PO Box 22054 Waco TX 76702-2054 817662-5587 * 7 Giant Scale Sheets * 60 Size Sheets * 40 Size . heets * Propeliw Decais WT 6 Shoots -3 sizes * Kill Markings 12 Sheets * Nomenclature Markings 3 Sizon -12 Sheets Black White copy * Letters Numbers 1 2344-13/16 10 Colors * Stan 10 Colors 11 SIzes plus Shoot ot Aesorted Sizes Major Decal pass flying colors DISTRIBUTORS INQUIRIES INVITED Call Paul Major 413 525-4110 ma7or decal Custom decal Manufacturer. L NORTHEAST SCREEN GRAPHICS 21 FISHER AVE EAST LONGMEADOW MA 01023 TEl 413-525-411g hand can read Further will assume thaE have read manual operated re ceiver enough Eo know Eo use jE will describe Ehe things special Ehis Eest test setup should wooden table a Connect 50-ohm unbalanced antenna BNC jack back ICOM receiver extend iE its full length antenna should supported vertically test table should fully extended b Place RC transmitter want measure table its antenna fully ex tended parallel receiver antenna about three feet 2 Set up switches a Referring Figure 1 make sure FMl/FM2 switch back panel FM1 position gives narrowest bandwidth re ceiver 6 dB F0 ±3 kHz b Select FM RH panel c Set RF Gain nine oclock position Squelch 12 oclock 3 Turn IC-R7000 needs oper ation about hour before make first measurements order provide stable re peatable measurements 4 Turn transmitter tested batteries should fully charged tenna should fully extended 5 Tune receiver transmitter frequen cy a Put meter switch C position find frequency Check needle swings about cale rock tuning knob b Put meter switch 5 position slide test transmitter around table until meter reads 40 What doing finding distance between two anten nas will produce 40 reference dial reading 6 Check sidebands Without changing test transmitter position rotate tuning knob change frequency display 20 kHz ie Raise lower displayed number 200 Note meter reading both positions a If needle goes position between 1 6 dial transmitter narrowband may rate Gold sticker use chan nels RCl2 through RC34 b If needle goes position between 6 10 dial transmitter wideband would rate Silver sticker would suitable channels RC38 through RC56 c If needle goes position between 10 60 dial transmitter doesnt rate sticker Repeat steps 4 through 6 new transmit ter want test havent discussed calibration ICOM IC R7000 Calibration particular business should done persons having right equipment plenty experience matter ways can make errors calibra tion process far too numerous discussion column type Suffice say two instruments known calibrated new found match above statements Another instrument checked after being service year calibration ter changed 10% result cali bration shift transmitters actually rated Gold sticker would have reported rate Silver sticker ICOM R7000 receiver good enough use scanner find identify transmissions RC bands except 27MHz band Continued page 128 36 Model Aviation r NO MORE KICKBACKS THROWN PROPS popular best selling odd-on ignition system world Convert engine spark ignition breakerless capacitive discharge Ignition System can installed engines 60 up both 2 & 4 stroke both single & twin cylinders 4-strokers run absolutely beautiful ignition 10 30% power 4-strobe engine No kick-heck throwing props Absolutely no pre-detonetion death 4-stroke engines Much lower priced feel & no rusty hearings commercial fuel available Red-Mex Very low 900-1000 rmp reliable idle end easy hand starts can control ignition timing will stop pro-detonation engine will russ mudi cooler develop power Now available conqaletely shielded sperk plug lead 90 plug cover Chosen TLG Mfg Byron Originals Its outstanding reliability Send St 00 price list newsletter ordering Box 1732 Riverton WY 82501 307 857-6897 CH Electronics Inc j WANNA RACE NORTHEAST AREA a BEGINNER RACES O-5oo FORM-i * FAI Instructions Club Programs Information Contact NORTH EAST PYLON RACING ORGANIZATION 119 DEAN AVEFRANKLIN MASS 02038 Tel 617 528-4043 203 673 -2000 altitude about 200 ft realized absolutely no control whatsoever model went left-hand spiral dive resulting impact macadam runway drove OS 30s crankshaft Out through rear crankcase cover turned model yellow Cover ite bag balsawood Also GI Joe pilot lost headbut lived fly again Other having stripped gears servos radio functioned flawlessly after crash So theory about loss control partially disconnected receiver battery pack stuffed rearward tempt shift CG time didnt bother tape radio connectors engine vibration took care rest disconnection So never did find out whether rearward CG shift would have improved J-3s spin entries did learn secure connectors tape fu ture models fly alone fly alone number readers sent letters commented Plane bites man story March 1988 column concerned incident modeler struck seriously injured own plane advice also Never fly alone Apparently lot out dont subscribe advice Most seem feel because no flying site wont suffer injury loss model because someone elses mistake Similarly mistake does jeopardize someone elses safety may true being hit model frequent cause injury Feeding fingers through own models prop com mon cause injury Driving car hand easy may impossible other hand being used stop flow blood Flying untested Scale models recent letter Del Rykert Batavia NY expressed con cern about numerous occasions wherein has seen modelers enter Scale contest model hadnt tested airworthiness Del asked opinion prevent such flagrant violation safety Unfortunately didnt have simple solution offer Del thinks Scale modelers reluctant test fly new model prior entering contest cause want save static judging such case suggests solution may reverse current order judging such fly first have static judging last As stated response Del dont have good feel prevalent problem Thats Im mentioning asking input Scale modelers have real safety problem untested models being flown Scale contests what solution MariahlTriebes Continued page 33 ing point may wish adjust bal ance fit own flying style come accustomed Mariah Sailplane likes fly fast smooth Mariah has full aerobatic cap abilities extremely stable aircraft speeds swept wing keeps plane highly stable during slow flight slows down very well landing need spoilers flaps said done impor tant thing have funand some exhilarating slope flying Ive experi enced has little Sailplane Mariah may best Soarer Ive ever flown shes definitely right up first rank Try yourself youre bound agree Radio Technique/Myers Continued page 36 can accurate enough find transmitters outside AMA frequency tolerances comes measuring power levels really isnt good enough installing Gold Silver stickers paragraph 322 AMA Guidelines requires spectrum analyzer used purpose think ICOM good enough reveal illegal crystal swappingand Contest Director really wants know about RC Giant Scale/de Vries Continued page 41 bewildering Some efficient othersthey convert same amount gas glow fuel power per cubic inch Thus some installations may able get away smaller engine just because efficient others its displacement range too hobby shops distributors carry available engines engine choice may depend availability cost factors other considerations proper propeller can make break spe cific engine great prop efficiency viewpoint may turn competent engine raging tiger Flight altitude included list engine choice factors primarily because its BIG amongst us Rocky Mountains Just cause fly altitudes 5000 7000 ft above sea level know going lose 20% engines power before props spun Conversely fly sea level en gine going put out its full power Since concerned scale outlines ten engine choose determined de sire keep within confines cowling best criteria lot us dont like bunch iromnongery disrupting scale lines models Hence inclined choose physically smaller engine might appropriate power-required view point Finally often consideration brand loyalty weve successful product particular manufacturer dined buy another engines Nothing wrong criterionas long favor ite manufacturer produces range power plants Andyou can choose suitable model Engine choice very personal thing can listen pronouncements experts theyre frequently right can follow rec ommendations models designerafter hes flown model specific engine size push comes shove youll have de cide engine use youll have early building sequence Itll take lot thought consideration final note may interest movers shakers AMA clubs IMAA chapters Jim Jennings Jennings Trophy Sales PO Box 1121 Hendersonville 128 Model Aviation ZIVIA Name Street Addreas City StateZip HoWW RNATIONAL INC
Edition: Model Aviation - 1988/06
Page Numbers: 34, 35, 36, 128
GeorgeMMye Radio Thchnque 70 Froeblich Farm Rd Hicksvlile NY 11801 ABSTRACT George Steiners procedure us ing ICOM IC-R7000 receiver spot check transmitter sidebands given IT AINT CHEAP cheaper used Contest Director RC meet wanted scanner order able verify flag contestants transmitter matched transmitters operating frequency Now he/she may want verify transmitter power levels well AMA rule book authorizes Contest Director make whatever measurements nec essary insure he/she able conduct contest doesnt create unnecessary risks contestants What tool makes mea surements possible Section 34 AMA Guidelines Narrow-Band Operation 72-75 MHz Radio Control Frequencies' hereafter called AMA Guidelines published September October 1987 editions AMA News calls transmitter frequency tolerance 1500 cycles 72 MHz band AMA Guideline narrow-band trans mitter calls 55 dB F0 ±20 kHz re quires three discrete power level measurements transmitters operating frequency frequencies 20 kHz away transmitters operating frequency Obviously need way measure fre quency accurately way measure power discrete frequency requires three things 1 need frequency measuring device should traceable accuracy back National Bureau Standards NBS should have frequency stability better 10 parts per million 72 MHz 10 ppm signal may drift 72 x 10 Hz tween measurements need something better 2 need narrow-band receiver sepa rate power specific band frequencies rest power being transmit ted Note speak band offtequen cies power discrete frequency no simple way measure power discrete frequency though may talk about doing 3 need power meter Ideally should measure absolute power traceable back NBS practise can learn need know relative-power meter such meters lot easier obtain less $1000 can buy machine serves functions frequencymeasuring meter programmable frequency stepping scanning receiver relative-power meter also has other functions arent interested right now machine refer ICOM IC-R7000 VHF/UHF General Coverage receiver available sources supply Amateur Radio crowd will mention Electronic Equipment Bank 516 Mill Street NE Vienna VA 22180 telephone 1-800-368-3270 because am looking catalog write column dimensions unit 4% H x 111/4 W x 10% D weight 16 lb power requirement 117/235 VAC optional 12 VDC Audio output 2 watts Sensitivity better 05 microvolts 10 dB SINAD frequency coverage 251000 MHz stability 5 ppm 10 600 Centigrade after one-hour warm-up Now before start writing letters about price am retired limited income $1000 lot money too question YOU have answer impor tant to make measurements Using ICOM IC-R7000 Procedure follows has worked Out veri 34 Model Aviation George P Steiner adjusting IC-R7000 shop ICOM receiver nesties between spectrum analyzer pile other test equipment Modelers Sacramento CA area truly blessed have George available care radio equipment ICOM IC-R7000 receiver L antenna attached isa portable unit note handle left side case works 110 VAC 12 VDC rear view unit R long pointer denoting FM1IFM2 switch Theres lots info column Correction March 1988 Radio Technique col umn George Myers page 34 said RCMA Radio Control Manufactur ers Association AMA involved joint effort certify transmitters using gold silver stickers seals indicate narrow-band wideband operation also said converted new fre quency OWBAM Old Wideband AM transmitter MUST have RCMA gold seal order sanctioned use AMA com petition low-band channels RCJ234 silver seal restricts transmitter high band channels RC3856 Additionally said eal should bar uses including sport flying last sentence definitely opinion rather fact two earlier quotes incorrect follows 1 AMA RCMA certifying transmitters basic objective check transmitters service modelers determine transmitters will suitable operation 1988 environment includes both narrow-band wideband op erations also provides means deter mining extent possible problems narrow-band program fully phased 1991 2 no current requirement transmitter have gold silver sticker Lack sticker does mean trans mitter banned kind flying However AMA Executive Council agrees current recommendation AMA Frequency Committee can expect stickers will required fly RC sanc tioned competition beginning 1989 Mean AMA recommends clubs consider adopting similar requirement club field operations summary gold silver stickers currently required AMA rec ommended means providing confi dence narrow-band frequency imple mentation plan will work Regardless stickers narrow-band trans mitters may now used AMA-sanctioned events channels RC12-34 inclusive per item 49 page 10 1988 AMA Member ship Manual Point clarification club requires trans mitters have sticker order used club field would club rule club rules automatically part AMA Safety Code General section item 3 Official AMA Safety Code ap plies clubs operations information provided help reduce confusion March article caused ev idenced phone calls letters AMA HQ also comments AMA members trade shows Normally Model Aviation mag azine columns scanned advance pub lication screen out information might incorrect misleading case screening process glitch wrong words got out apolog ize can help us set record straight passing information described fled agalnst spectrum analyzer George P Steiner am merely reporter 1 Test setup am now going assume have receiver receiver manual B&P Associates Gives Total Flight Line FREEDOM new electnc starter battery pack cuts cord has always tied starter power panel Discover freedom being able start plane wherever added safety less wire get caught prop charge hefty 4 Amp/hour pack will take through weekend flying power enough spare dont stop have Ni-Cads virtually size imaginable cut experimenter free design whatever takes make yours best setup field June 1988 35 *475AVAILABLE AT AMERICAS470 DISTRIBUTED BY FINEST HOBBY SHOPS 5MflflHI RED WE WZZDE 7560 Sat GobeI Road eo CA 83422 486-1717 battery needs- write B&P Associates PO Box 22054 Waco TX 76702-2054 817662-5587 * 7 Giant Scale Sheets * 60 Size Sheets * 40 Size . heets * Propeliw Decais WT 6 Shoots -3 sizes * Kill Markings 12 Sheets * Nomenclature Markings 3 Sizon -12 Sheets Black White copy * Letters Numbers 1 2344-13/16 10 Colors * Stan 10 Colors 11 SIzes plus Shoot ot Aesorted Sizes Major Decal pass flying colors DISTRIBUTORS INQUIRIES INVITED Call Paul Major 413 525-4110 ma7or decal Custom decal Manufacturer. L NORTHEAST SCREEN GRAPHICS 21 FISHER AVE EAST LONGMEADOW MA 01023 TEl 413-525-411g hand can read Further will assume thaE have read manual operated re ceiver enough Eo know Eo use jE will describe Ehe things special Ehis Eest test setup should wooden table a Connect 50-ohm unbalanced antenna BNC jack back ICOM receiver extend iE its full length antenna should supported vertically test table should fully extended b Place RC transmitter want measure table its antenna fully ex tended parallel receiver antenna about three feet 2 Set up switches a Referring Figure 1 make sure FMl/FM2 switch back panel FM1 position gives narrowest bandwidth re ceiver 6 dB F0 ±3 kHz b Select FM RH panel c Set RF Gain nine oclock position Squelch 12 oclock 3 Turn IC-R7000 needs oper ation about hour before make first measurements order provide stable re peatable measurements 4 Turn transmitter tested batteries should fully charged tenna should fully extended 5 Tune receiver transmitter frequen cy a Put meter switch C position find frequency Check needle swings about cale rock tuning knob b Put meter switch 5 position slide test transmitter around table until meter reads 40 What doing finding distance between two anten nas will produce 40 reference dial reading 6 Check sidebands Without changing test transmitter position rotate tuning knob change frequency display 20 kHz ie Raise lower displayed number 200 Note meter reading both positions a If needle goes position between 1 6 dial transmitter narrowband may rate Gold sticker use chan nels RCl2 through RC34 b If needle goes position between 6 10 dial transmitter wideband would rate Silver sticker would suitable channels RC38 through RC56 c If needle goes position between 10 60 dial transmitter doesnt rate sticker Repeat steps 4 through 6 new transmit ter want test havent discussed calibration ICOM IC R7000 Calibration particular business should done persons having right equipment plenty experience matter ways can make errors calibra tion process far too numerous discussion column type Suffice say two instruments known calibrated new found match above statements Another instrument checked after being service year calibration ter changed 10% result cali bration shift transmitters actually rated Gold sticker would have reported rate Silver sticker ICOM R7000 receiver good enough use scanner find identify transmissions RC bands except 27MHz band Continued page 128 36 Model Aviation r NO MORE KICKBACKS THROWN PROPS popular best selling odd-on ignition system world Convert engine spark ignition breakerless capacitive discharge Ignition System can installed engines 60 up both 2 & 4 stroke both single & twin cylinders 4-strokers run absolutely beautiful ignition 10 30% power 4-strobe engine No kick-heck throwing props Absolutely no pre-detonetion death 4-stroke engines Much lower priced feel & no rusty hearings commercial fuel available Red-Mex Very low 900-1000 rmp reliable idle end easy hand starts can control ignition timing will stop pro-detonation engine will russ mudi cooler develop power Now available conqaletely shielded sperk plug lead 90 plug cover Chosen TLG Mfg Byron Originals Its outstanding reliability Send St 00 price list newsletter ordering Box 1732 Riverton WY 82501 307 857-6897 CH Electronics Inc j WANNA RACE NORTHEAST AREA a BEGINNER RACES O-5oo FORM-i * FAI Instructions Club Programs Information Contact NORTH EAST PYLON RACING ORGANIZATION 119 DEAN AVEFRANKLIN MASS 02038 Tel 617 528-4043 203 673 -2000 altitude about 200 ft realized absolutely no control whatsoever model went left-hand spiral dive resulting impact macadam runway drove OS 30s crankshaft Out through rear crankcase cover turned model yellow Cover ite bag balsawood Also GI Joe pilot lost headbut lived fly again Other having stripped gears servos radio functioned flawlessly after crash So theory about loss control partially disconnected receiver battery pack stuffed rearward tempt shift CG time didnt bother tape radio connectors engine vibration took care rest disconnection So never did find out whether rearward CG shift would have improved J-3s spin entries did learn secure connectors tape fu ture models fly alone fly alone number readers sent letters commented Plane bites man story March 1988 column concerned incident modeler struck seriously injured own plane advice also Never fly alone Apparently lot out dont subscribe advice Most seem feel because no flying site wont suffer injury loss model because someone elses mistake Similarly mistake does jeopardize someone elses safety may true being hit model frequent cause injury Feeding fingers through own models prop com mon cause injury Driving car hand easy may impossible other hand being used stop flow blood Flying untested Scale models recent letter Del Rykert Batavia NY expressed con cern about numerous occasions wherein has seen modelers enter Scale contest model hadnt tested airworthiness Del asked opinion prevent such flagrant violation safety Unfortunately didnt have simple solution offer Del thinks Scale modelers reluctant test fly new model prior entering contest cause want save static judging such case suggests solution may reverse current order judging such fly first have static judging last As stated response Del dont have good feel prevalent problem Thats Im mentioning asking input Scale modelers have real safety problem untested models being flown Scale contests what solution MariahlTriebes Continued page 33 ing point may wish adjust bal ance fit own flying style come accustomed Mariah Sailplane likes fly fast smooth Mariah has full aerobatic cap abilities extremely stable aircraft speeds swept wing keeps plane highly stable during slow flight slows down very well landing need spoilers flaps said done impor tant thing have funand some exhilarating slope flying Ive experi enced has little Sailplane Mariah may best Soarer Ive ever flown shes definitely right up first rank Try yourself youre bound agree Radio Technique/Myers Continued page 36 can accurate enough find transmitters outside AMA frequency tolerances comes measuring power levels really isnt good enough installing Gold Silver stickers paragraph 322 AMA Guidelines requires spectrum analyzer used purpose think ICOM good enough reveal illegal crystal swappingand Contest Director really wants know about RC Giant Scale/de Vries Continued page 41 bewildering Some efficient othersthey convert same amount gas glow fuel power per cubic inch Thus some installations may able get away smaller engine just because efficient others its displacement range too hobby shops distributors carry available engines engine choice may depend availability cost factors other considerations proper propeller can make break spe cific engine great prop efficiency viewpoint may turn competent engine raging tiger Flight altitude included list engine choice factors primarily because its BIG amongst us Rocky Mountains Just cause fly altitudes 5000 7000 ft above sea level know going lose 20% engines power before props spun Conversely fly sea level en gine going put out its full power Since concerned scale outlines ten engine choose determined de sire keep within confines cowling best criteria lot us dont like bunch iromnongery disrupting scale lines models Hence inclined choose physically smaller engine might appropriate power-required view point Finally often consideration brand loyalty weve successful product particular manufacturer dined buy another engines Nothing wrong criterionas long favor ite manufacturer produces range power plants Andyou can choose suitable model Engine choice very personal thing can listen pronouncements experts theyre frequently right can follow rec ommendations models designerafter hes flown model specific engine size push comes shove youll have de cide engine use youll have early building sequence Itll take lot thought consideration final note may interest movers shakers AMA clubs IMAA chapters Jim Jennings Jennings Trophy Sales PO Box 1121 Hendersonville 128 Model Aviation ZIVIA Name Street Addreas City StateZip HoWW RNATIONAL INC
Edition: Model Aviation - 1988/06
Page Numbers: 34, 35, 36, 128
GeorgeMMye Radio Thchnque 70 Froeblich Farm Rd Hicksvlile NY 11801 ABSTRACT George Steiners procedure us ing ICOM IC-R7000 receiver spot check transmitter sidebands given IT AINT CHEAP cheaper used Contest Director RC meet wanted scanner order able verify flag contestants transmitter matched transmitters operating frequency Now he/she may want verify transmitter power levels well AMA rule book authorizes Contest Director make whatever measurements nec essary insure he/she able conduct contest doesnt create unnecessary risks contestants What tool makes mea surements possible Section 34 AMA Guidelines Narrow-Band Operation 72-75 MHz Radio Control Frequencies' hereafter called AMA Guidelines published September October 1987 editions AMA News calls transmitter frequency tolerance 1500 cycles 72 MHz band AMA Guideline narrow-band trans mitter calls 55 dB F0 ±20 kHz re quires three discrete power level measurements transmitters operating frequency frequencies 20 kHz away transmitters operating frequency Obviously need way measure fre quency accurately way measure power discrete frequency requires three things 1 need frequency measuring device should traceable accuracy back National Bureau Standards NBS should have frequency stability better 10 parts per million 72 MHz 10 ppm signal may drift 72 x 10 Hz tween measurements need something better 2 need narrow-band receiver sepa rate power specific band frequencies rest power being transmit ted Note speak band offtequen cies power discrete frequency no simple way measure power discrete frequency though may talk about doing 3 need power meter Ideally should measure absolute power traceable back NBS practise can learn need know relative-power meter such meters lot easier obtain less $1000 can buy machine serves functions frequencymeasuring meter programmable frequency stepping scanning receiver relative-power meter also has other functions arent interested right now machine refer ICOM IC-R7000 VHF/UHF General Coverage receiver available sources supply Amateur Radio crowd will mention Electronic Equipment Bank 516 Mill Street NE Vienna VA 22180 telephone 1-800-368-3270 because am looking catalog write column dimensions unit 4% H x 111/4 W x 10% D weight 16 lb power requirement 117/235 VAC optional 12 VDC Audio output 2 watts Sensitivity better 05 microvolts 10 dB SINAD frequency coverage 251000 MHz stability 5 ppm 10 600 Centigrade after one-hour warm-up Now before start writing letters about price am retired limited income $1000 lot money too question YOU have answer impor tant to make measurements Using ICOM IC-R7000 Procedure follows has worked Out veri 34 Model Aviation George P Steiner adjusting IC-R7000 shop ICOM receiver nesties between spectrum analyzer pile other test equipment Modelers Sacramento CA area truly blessed have George available care radio equipment ICOM IC-R7000 receiver L antenna attached isa portable unit note handle left side case works 110 VAC 12 VDC rear view unit R long pointer denoting FM1IFM2 switch Theres lots info column Correction March 1988 Radio Technique col umn George Myers page 34 said RCMA Radio Control Manufactur ers Association AMA involved joint effort certify transmitters using gold silver stickers seals indicate narrow-band wideband operation also said converted new fre quency OWBAM Old Wideband AM transmitter MUST have RCMA gold seal order sanctioned use AMA com petition low-band channels RCJ234 silver seal restricts transmitter high band channels RC3856 Additionally said eal should bar uses including sport flying last sentence definitely opinion rather fact two earlier quotes incorrect follows 1 AMA RCMA certifying transmitters basic objective check transmitters service modelers determine transmitters will suitable operation 1988 environment includes both narrow-band wideband op erations also provides means deter mining extent possible problems narrow-band program fully phased 1991 2 no current requirement transmitter have gold silver sticker Lack sticker does mean trans mitter banned kind flying However AMA Executive Council agrees current recommendation AMA Frequency Committee can expect stickers will required fly RC sanc tioned competition beginning 1989 Mean AMA recommends clubs consider adopting similar requirement club field operations summary gold silver stickers currently required AMA rec ommended means providing confi dence narrow-band frequency imple mentation plan will work Regardless stickers narrow-band trans mitters may now used AMA-sanctioned events channels RC12-34 inclusive per item 49 page 10 1988 AMA Member ship Manual Point clarification club requires trans mitters have sticker order used club field would club rule club rules automatically part AMA Safety Code General section item 3 Official AMA Safety Code ap plies clubs operations information provided help reduce confusion March article caused ev idenced phone calls letters AMA HQ also comments AMA members trade shows Normally Model Aviation mag azine columns scanned advance pub lication screen out information might incorrect misleading case screening process glitch wrong words got out apolog ize can help us set record straight passing information described fled agalnst spectrum analyzer George P Steiner am merely reporter 1 Test setup am now going assume have receiver receiver manual B&P Associates Gives Total Flight Line FREEDOM new electnc starter battery pack cuts cord has always tied starter power panel Discover freedom being able start plane wherever added safety less wire get caught prop charge hefty 4 Amp/hour pack will take through weekend flying power enough spare dont stop have Ni-Cads virtually size imaginable cut experimenter free design whatever takes make yours best setup field June 1988 35 *475AVAILABLE AT AMERICAS470 DISTRIBUTED BY FINEST HOBBY SHOPS 5MflflHI RED WE WZZDE 7560 Sat GobeI Road eo CA 83422 486-1717 battery needs- write B&P Associates PO Box 22054 Waco TX 76702-2054 817662-5587 * 7 Giant Scale Sheets * 60 Size Sheets * 40 Size . heets * Propeliw Decais WT 6 Shoots -3 sizes * Kill Markings 12 Sheets * Nomenclature Markings 3 Sizon -12 Sheets Black White copy * Letters Numbers 1 2344-13/16 10 Colors * Stan 10 Colors 11 SIzes plus Shoot ot Aesorted Sizes Major Decal pass flying colors DISTRIBUTORS INQUIRIES INVITED Call Paul Major 413 525-4110 ma7or decal Custom decal Manufacturer. L NORTHEAST SCREEN GRAPHICS 21 FISHER AVE EAST LONGMEADOW MA 01023 TEl 413-525-411g hand can read Further will assume thaE have read manual operated re ceiver enough Eo know Eo use jE will describe Ehe things special Ehis Eest test setup should wooden table a Connect 50-ohm unbalanced antenna BNC jack back ICOM receiver extend iE its full length antenna should supported vertically test table should fully extended b Place RC transmitter want measure table its antenna fully ex tended parallel receiver antenna about three feet 2 Set up switches a Referring Figure 1 make sure FMl/FM2 switch back panel FM1 position gives narrowest bandwidth re ceiver 6 dB F0 ±3 kHz b Select FM RH panel c Set RF Gain nine oclock position Squelch 12 oclock 3 Turn IC-R7000 needs oper ation about hour before make first measurements order provide stable re peatable measurements 4 Turn transmitter tested batteries should fully charged tenna should fully extended 5 Tune receiver transmitter frequen cy a Put meter switch C position find frequency Check needle swings about cale rock tuning knob b Put meter switch 5 position slide test transmitter around table until meter reads 40 What doing finding distance between two anten nas will produce 40 reference dial reading 6 Check sidebands Without changing test transmitter position rotate tuning knob change frequency display 20 kHz ie Raise lower displayed number 200 Note meter reading both positions a If needle goes position between 1 6 dial transmitter narrowband may rate Gold sticker use chan nels RCl2 through RC34 b If needle goes position between 6 10 dial transmitter wideband would rate Silver sticker would suitable channels RC38 through RC56 c If needle goes position between 10 60 dial transmitter doesnt rate sticker Repeat steps 4 through 6 new transmit ter want test havent discussed calibration ICOM IC R7000 Calibration particular business should done persons having right equipment plenty experience matter ways can make errors calibra tion process far too numerous discussion column type Suffice say two instruments known calibrated new found match above statements Another instrument checked after being service year calibration ter changed 10% result cali bration shift transmitters actually rated Gold sticker would have reported rate Silver sticker ICOM R7000 receiver good enough use scanner find identify transmissions RC bands except 27MHz band Continued page 128 36 Model Aviation r NO MORE KICKBACKS THROWN PROPS popular best selling odd-on ignition system world Convert engine spark ignition breakerless capacitive discharge Ignition System can installed engines 60 up both 2 & 4 stroke both single & twin cylinders 4-strokers run absolutely beautiful ignition 10 30% power 4-strobe engine No kick-heck throwing props Absolutely no pre-detonetion death 4-stroke engines Much lower priced feel & no rusty hearings commercial fuel available Red-Mex Very low 900-1000 rmp reliable idle end easy hand starts can control ignition timing will stop pro-detonation engine will russ mudi cooler develop power Now available conqaletely shielded sperk plug lead 90 plug cover Chosen TLG Mfg Byron Originals Its outstanding reliability Send St 00 price list newsletter ordering Box 1732 Riverton WY 82501 307 857-6897 CH Electronics Inc j WANNA RACE NORTHEAST AREA a BEGINNER RACES O-5oo FORM-i * FAI Instructions Club Programs Information Contact NORTH EAST PYLON RACING ORGANIZATION 119 DEAN AVEFRANKLIN MASS 02038 Tel 617 528-4043 203 673 -2000 altitude about 200 ft realized absolutely no control whatsoever model went left-hand spiral dive resulting impact macadam runway drove OS 30s crankshaft Out through rear crankcase cover turned model yellow Cover ite bag balsawood Also GI Joe pilot lost headbut lived fly again Other having stripped gears servos radio functioned flawlessly after crash So theory about loss control partially disconnected receiver battery pack stuffed rearward tempt shift CG time didnt bother tape radio connectors engine vibration took care rest disconnection So never did find out whether rearward CG shift would have improved J-3s spin entries did learn secure connectors tape fu ture models fly alone fly alone number readers sent letters commented Plane bites man story March 1988 column concerned incident modeler struck seriously injured own plane advice also Never fly alone Apparently lot out dont subscribe advice Most seem feel because no flying site wont suffer injury loss model because someone elses mistake Similarly mistake does jeopardize someone elses safety may true being hit model frequent cause injury Feeding fingers through own models prop com mon cause injury Driving car hand easy may impossible other hand being used stop flow blood Flying untested Scale models recent letter Del Rykert Batavia NY expressed con cern about numerous occasions wherein has seen modelers enter Scale contest model hadnt tested airworthiness Del asked opinion prevent such flagrant violation safety Unfortunately didnt have simple solution offer Del thinks Scale modelers reluctant test fly new model prior entering contest cause want save static judging such case suggests solution may reverse current order judging such fly first have static judging last As stated response Del dont have good feel prevalent problem Thats Im mentioning asking input Scale modelers have real safety problem untested models being flown Scale contests what solution MariahlTriebes Continued page 33 ing point may wish adjust bal ance fit own flying style come accustomed Mariah Sailplane likes fly fast smooth Mariah has full aerobatic cap abilities extremely stable aircraft speeds swept wing keeps plane highly stable during slow flight slows down very well landing need spoilers flaps said done impor tant thing have funand some exhilarating slope flying Ive experi enced has little Sailplane Mariah may best Soarer Ive ever flown shes definitely right up first rank Try yourself youre bound agree Radio Technique/Myers Continued page 36 can accurate enough find transmitters outside AMA frequency tolerances comes measuring power levels really isnt good enough installing Gold Silver stickers paragraph 322 AMA Guidelines requires spectrum analyzer used purpose think ICOM good enough reveal illegal crystal swappingand Contest Director really wants know about RC Giant Scale/de Vries Continued page 41 bewildering Some efficient othersthey convert same amount gas glow fuel power per cubic inch Thus some installations may able get away smaller engine just because efficient others its displacement range too hobby shops distributors carry available engines engine choice may depend availability cost factors other considerations proper propeller can make break spe cific engine great prop efficiency viewpoint may turn competent engine raging tiger Flight altitude included list engine choice factors primarily because its BIG amongst us Rocky Mountains Just cause fly altitudes 5000 7000 ft above sea level know going lose 20% engines power before props spun Conversely fly sea level en gine going put out its full power Since concerned scale outlines ten engine choose determined de sire keep within confines cowling best criteria lot us dont like bunch iromnongery disrupting scale lines models Hence inclined choose physically smaller engine might appropriate power-required view point Finally often consideration brand loyalty weve successful product particular manufacturer dined buy another engines Nothing wrong criterionas long favor ite manufacturer produces range power plants Andyou can choose suitable model Engine choice very personal thing can listen pronouncements experts theyre frequently right can follow rec ommendations models designerafter hes flown model specific engine size push comes shove youll have de cide engine use youll have early building sequence Itll take lot thought consideration final note may interest movers shakers AMA clubs IMAA chapters Jim Jennings Jennings Trophy Sales PO Box 1121 Hendersonville 128 Model Aviation ZIVIA Name Street Addreas City StateZip HoWW RNATIONAL INC