Radio Techniq George M Myers ue NEW FREQUENCIES OLD FREQUEN CIES AND SCANNERS As write seems pretty likely will have new fre quencies available 1983 season brings up two thoughts Frequency Monitoring Frequency Control Frequency Monitoring means listening what going RC channel propose use before turn transmitter Frequency Control means making some kind provision assure no else tries use same channel using World Engines put scanning monitor market some time ago didnt sell particularly well bought didnt use much reason using scanner cant hear above noise engine also lot carping about fact order get away local effects related strength signal trans mitters flight line monitor located reasonable distance away meant couldnt fly monitor too Finally scanning monitor idea suffered fact monitor receiver working ground level short antenna simply couldnt hear same interference plane could several hundred feet above field com plaints really valid Well see moment First what about future see two problem areas Continued use seven existing evennumbered 72-76 MHz frequencies face ever-increasing interference during 5-year grandfather period would expect such users would find scanner become virtually necessity just make flying possible 2 Beginning use large number oddnumbered 7 2-76 MHz frequencies face certain interference some ofthem justification giving us first place scanner will tell channels avoid particular part world should guide purchasing deci sions What kinds interference likely en counter Obviously interference another modeler same channel number problem clothespin idea has proven work everyone follows religiously trouble everyone does rye seen dozens good ideas presented purpose frequency control break down some independent jerk wont play rules Theres always guy atthe field wont put clip antenna fear scratching insists can run up engine make control adjustments transmitter antenna collapsed wont hurt anybody dont have problems youve got contend guy forgets Scanner duty Its showing intermodulation 72400 two transmitters operating 72240 72080 simultaneously Note signal strength meter indicates intermodulation signal very weak 26 Model Aviation looks frequency flag misinterprets color theres problem trans mitter thats left ON Somebody always gets hurt Proper use scanner could eliminate some problems Next interference list would inter ference some commercial user Mr John R Lange 1700 North 37th Ave Stone Park IL 60165 has telling experience monitoring interference over year John manufacturer three kits converters described Receiving Converters RC Fre quencies Model Aviation February 1982 p 36 letters continuously update informa tion gaining sitting quietly listening . car radio hooked up converters driving Ham receiver home Johns call K9ARA Hams out might want give him shout see what latest findings John finding lot activity bands interesting part activity inter mittent somewhat randomly-spaced time As far monitor concerned have sit listen long time before can have confidence know what likely happen brief pause monitor receiver just before turning tolly isn tgood enough dont get anything else column go hack read last sentence until under stand After weve dealt primary interferences described above still have intermodulation occasionally image problems deal scanning monitor will reveal inter modulation time image conditions right spoke intermodulation image Electronic Bird-Dog column January 1982 p 30 referring contributions AMA Frequency Committee Member Bill Hersch berger printed AMA News January 1981 Briefly intermodulation inter ference occurs signals two differ ent transmitters enter RF section receiver beat against another produce signal third channelwhich happens trying use photo shows Airtronics scanner sent evaluation photo transmitters 7208 Bn/Wh 7224 R/Wh intermodulating produce input 7240 Or/Wh scanner indicates lighting three LEDs two should lit Airtronics scanner shows presence signal four different ways First loudspeaker makes BRRR sound receiving AM RC signal Next row LEDs latch ON receiving sufficiently strong signal strength received signal presented meter Finally attached whip antenna can posi tioned anywhere hemisphere indications alone important Comparison between tham also important photo scanner shows what happens stop scanning affected channel 7240 case hear BRRR see LED lit see signal-strength meter zero able deduce intermodulation inter ference present 7240 relative signal strength very low therefore actual interference should minimal long model airplane 7240 does pass very close intermodulating transmitters reason last statement trans mitters signal strength perceived receiver varies inversely distance between model 7240 far its proper trans mitter passes very close intermodulat ing 7208 7224 transmitters intermodulation result can stronger tended control signal Refer back original articles RT January 1982 issue Bill Hershbergers Togetherness Can Bring Glitches article January 1981 AMA News find rest combinations can may now wondering Just bow far away will scanner pick up transmitter frequency order find out left son Tim bythesideofalong straight flatroad holding Airtronics XLtransmitteras flying gave signal reference taped scanner hood car could keep eye meter driving extended antenna vertically drove away Tim stopping occasionally turn off engine record data table cars odometer gave distance measurements scanner has signal strength meter cali brated linearly 0 8 units unspecified meter dropped less linearly distance value 075 miles Once down toO meter stayed distance increased further row LEDs show frequency being monitored lighting monitoring taking July 198227 Multi Charger b7 e Power Pacer New H S Hornet 2 CID 6 1/3 HP Only 6 1/4 lbs So compact measures much larger Quadra Partner engine Comes complete built-in choke &-bolt prop hub Radial mount twin stack available List $28995 INTRO $19995 Youll Love Partner An updated version popular engine Note improve ments mode especially mini ature aircraft use roller thruse bearing double-ring piston soerk nba location low 13 1/21 power output LiMITED TIME OFFER LIST $14995 SALE $8995 Nrni too piflrw stat cord crate Hatdotr Prop hob MORE HORIJER SPECIALS PART RETAILSALE RADIAL MOUNT Rapa3 797Sj103 RADIAL MOUNTPamaeC123 TWIN STACK EXHAUST 37 & Kierira105 109$9500$2995TWIN STACK EXHAUST Pavaer Oeadro120 1122499518900CHOKE ASSEMBLVPaflearN Onadno121 lOB725009995BRITE SPINNER Raper Pt N Ocad122 1196500NEOPRENE GAS LINE Par Poor107 to25 00RESISTOR SPARK PLUG RCJ-6113 RIG PROPS AVAILABLEi Finiahed aed BaIaread Wood tOt1495 102995 SALE $17995 SALE 12 55 1200 2495 1995 5 00 tvss 95 2 50 Write CALc secRete aPER Super rower Panel QUALITY EQUIPMENT THAT FILLS ALL OF THE ELECTRICAL NEEDS OF YOUR RIC ACCESSORIES L R Taylor & Co 2ntact DeZ oe plaCG strong enough signal detected thG LED latches ON until next scan Latching ceased about 075 miles loudspeaker sounds detected modulation signal volume control adjusts sound level used Radio Shack sound level meter measure output sound level order exclude ambient noise much possible put microphone directly over loudspeaker laying sound level meter top scanner gives rise measurement seems much louder really Ambient noise 100 dB like sound rivet gun scanner isnt really loud found sound level corresponding dis tortion about 102 dB obtained volume-control dial setting 25 dial marked 0 5 equal undefined incre ments Driving away Tim measurement held 102 dB dial setting of25 way out 030 miles necessary start increasing dial setting linearly distance maintain 102 dB level 075 miles volume control 5 distance outward sound level dropped drop seemed follow inverse-square law should until signal lost back ground noise about 19 miles above can deduce scanner picking up Tims transmitter far beyond point could see what holding fact three flying Sites use locally mutually less 15 miles apart crow flies may deduce scanner can reagh out far has order detect other transmitters ground level might affect flying put idea way because weve using fields several years en countering unusual amount unexplained interference fact time has interference far juSt happened no flying other fields frequency being affected 15 miles can occasionally get glimpse light flashing off MonoKote sun right can see another flyingmore less Since rare airplane stray 2000 feet owners transmitter because hard see way going relative signal strength identical transmitter other field never better 6% owners signal Thats like noise interference above measurements have convinced Airtronics scanner useful tool hope convinced too important thing to learn use tool properly Far too folks know will turn transmitters hold within two three antenna lengths monitor complain because several LEDs light up Sure sensitive instrument youre overloading something like want monitor flying field monitor wants 500 1 000 feet away flight line means youll need CB communications theyre pretty common days guy scanner should car CB portable unit pits can provide other end conversation will volunteer monitoring frequency use everybody will benefit no will give up anything opportunity BS little given two-way conversa tion CB dont have give up As might expect Airtronics scanner self-contained portabJe can powered alkaline pencells eight hours Ni-Cds five Con tin ued page 125 28 Model Aviation MIt Anseninac Power Eqoip co Kawasaki Homers Smooth One. 222 CID Sale $17995 315 CID Sale $19499 Comes 6-bolt hub built-in choke Twin stack mount optional Like Quadra Optw.l Oai-tch eer tech oroi omihk Sehcrice aesihhl Oohl-rig pius Ie hi1he coepesois S isgsr lit Optiosti chah Est hood oOrtiru Spsoisl nleo.coplithigheeois orotsa I. ec esitisli. Sslid-hst typs iso op tiosl sdisl spit cell tloot-huri9 eolsoiclt Icr s.i ossdi circuIt Pohslod lisrewcot eh.l 19 ROPER ENGINE CLOSE OUT SALE WHILE THEY LAST 37 SUPER POWER ROPER 22 DUADRA ENGINE 19 ENGINE HUB ft MOUNT PACK 18 USED DEMO ENGINE BALENCED 6-BOLT HUB Ropa Porno, ft Otaedeaj PROP DRILL JIIS love 24 wI optional choke Send 20c Stamp far Catalogiwill Ship Orders Same Oay 1200UPSAud 54 shippiiis per engivr HOR N ER SALES INC Rt 2 Box 9300 Dixie Hwy. 312 946-2515 Beecher IL 60401 THE QUALITY LINETh OF RIC ELECTRONICS vance J*4 5-- 20831 Roscoc Blvd Canoga Park California 91306 213 360-1178 THINK FOX N N Weve Got Support Hardware 2 Vo G ow P ugs Dry Cell Nickel Cad 2 Vo G ow P ugs Lead Acid Battery THE FOX GLOW PLUGS #601061 oentiorral Spinner $1200 #601071 oentional Spinner 1300 #60100 2 Conventional Spinner1400 #601092Conoentonal Spinnei 1500 -#601102 s Co entional Spinner 1600 AlI t FOX POLISHED SPINNERS Offered Three Attractive Styles Conventional Slim Jim / Conical #6020610linrJiinSpnnei$1300 #602071OliieJreopinner 1400 #60206 2 Olin lie Spinner1500 #602092SliiedirnSpinn#r 1600 #602102iOliieJireOpinner 1750 #603061 cal Spinner $t2 00 #603071 Conicat Spinner t3 06 #60300 2 Conical Spinner1400 #603092 cal Spinner 1500 #603102Conca Opener 1600 SPINNER NUTS #60503 03200 neerNoi $200 #60504 1 4 Op cnn Net225 #40101 StandardShort51 beach#doto3Standard Short$1l9nach #40201 Standard Long1 19 each#40203 Standard Long1 19 646502 RiG ShOrt 169 each#40503 RIG ShOrt 169 #40602 PlC Long 1 69 each940603 RIG Long 169 FOX PROP REAMERS Enlarge Prop Shaft Holes larger sizes required can fieldi FOURWAY &FOX ENGINE MOUNTS #OO2lOkErngelehtoant 1506 5 000 TWOWAYRugged Machined Bar Stocke504oiFrirreMoant1217906 #50402 Engine MOont 1 281900 #50403 Engine MoontI 320900 FOX WRENCHESFXEngine Mood1305900 #701012 Wa0 W ench 316 Shall$225501 6 6 656MFG Co#50601 Engine MOunt 14751000 #7OtO22WayW enchi 4 Shalt225#60603 Engine Mount 16401000 #70103 2-Way Wrench 5I16Ohait 0225 5355 Towscn Ace Fort Smith Arkuosas 72901 #50604 Engine Ictoont t 750 1000 #70104 POor Way Wrench795 Reamers & Wrenches Plugs & Mounts & Spinners flying Quarter Scale Aristocrat Fredericks burg last year doubt arose about transmitter batteries Bill Kaluf MEN charger able within 60 seconds conftrm batteries indeed OK 1982 will always year Pac Man gobbled up Ive never trouble batteries before go circles three weeks traumatic almost began scream Give Rubber Power give death Bill Winter 4426 Altura Ct Fairfax VA 22030 Radio Technique/Myers Continued iaqe 28 hours charger plugs cigarette lighter car Doug Pratt has running Airtronics scanner AMA head quarters building downtown DC using Airtronics transmitter charger power theres voltage regulator scanner takes care fact transmitter charger puts out eight cells scanner has four Doug has picked ups variety signals thats OK because no flies RC downtown DC tried same setup house Hicks ville detected nothing Interference find took scanner road found place could hear musical tones sounded bit like pushbutton telephone signals also heard voices time time laid whip antenna parallel ground way us have antennas planes days found strong BRRR signals over flying field no flying also found same signal other places So far havent identified source think its some kind computer data transmission dozens tall towers within sight flying fields sport kinds antennas whips dishes things hidden radomes detect interference have run over scanner stop scan affected channel working AUTO MANUAL switch have compare sound way antenna pointing LEDs meter want learn anything must log time describe whatever have heard After youll build up file channels monitoring now scanner monitors 7208 7216 7224 7232 7240 7296 7564 future Should simple matter monitor others crystal swapping Bandwidth may become slight problem monitoring new frequencies doubt will significant AMA draft Phase-In Plan puts new frequencies 40 KHzapartsee RT April 1982 has demonstrated acceptable existing receiver designs such Airtronics instrument contains Any way look scanning monitor will helpful trying years immediately ahead agree want buy write directly Airtronics 12160 Woodruff Ave. Downey CA 90241 telephone 213 862 6583 may wonder danced neatly away image problems begin image problems rare encounter receiver situated frequency basis midway between two transmitters separated exactly double IF intermediate Cootinued oI page 128 July 1982 125 #70201 FOX 4-step Reamer #70202 FOX KNO Reamer moot purposes$695 icr KER Ohait sioeh 0095 HObbV B0~ habln rprazlniri TIMER KITS tOut1 Partial Kits P & W Oenri-Ruts--Rib Tip Fiurmer Kilo 1941 Playboy Jr 54ii Span 101cc Extra $1456 Plan--$2 50 Gomparuon Strepanod iiKitii~$l3 12 Coabloatian Playboy Jr tall abov# ilnms$2# 00 1641 Playboy Sr #o span Plan Eatrat $1925 Plan-$360 Companion Slpwond Kit $2636 Combination Playboy Sr-tall three itecis $4500 1939 Zipper Comet 54ii Span Plan Inol $3360 Companion Stripanod Kit- $1572 combination Zipper tBotB above iinms--545Ot 1937 flaIls/re Sportster 100 Span Plan EX $2600 Plan--55 09 Companion Stripisood Kit-$35 06 Combination Dallairn Kit oIl three ilemsl-$56 00 1930 Powerhouse #4 Span Plan Extra $3106 Pian--$450 Companion Stripeond Kit- $1776 Combination Poinerhouse Kit tall 3 aboVe $3900 Other cooibinations available-- 1930 Buccanenr$49 00 1936 Clipper 51K 1 $3860 1939 Mercury $5506 1935 Miss Airierica 5s90a 1940 Ranger $2100 1040 Sailplane $7000 1040 So Long $2690 1930 Tendon rerror $3000 Korita Woke $1600 AIIOIOAP MODEL COMPANY Partial Kilo 1936 Plying Quaker #4 Span Plan Inol $2156 Companion Stripwood Kit -$3140 Combinalino Plying Quaker Kit tBolhilems$4#00 1937 Quoker PIrish 07 Span Plan lcd $57St Companion Stripmood Kit--52345 Combination Quaker Plash Kit Both items $3000 1937 Long Cabin 70 Span Plan Extra $1560 Plan- $500 Companion Stripmood Kil-$2456 Combination Lang Cabin Kit tall tbree--$4100 MdOWAY MOOEL COMPANY Poll Rita 0936 Air Trails Sportsler 50 16- 15 H/C $3506 1036 Pomerhouoe 50 Span l0-lh H/C $3596 1940 Buazard Bombshell 30 Span 036 $1195 1940 Playbcy Sr pun 020 engines $129 163$ Miss America 36 Span 020 engines $t2951940 Clipper WRIt 36 Span 020 engines 5t495 1940 New Ruler 31 Span 620 engines $1301 1940 Mercury Scientifics 36 span 020 $1395 1941 Request 30 Span 029 engines $1291 SHIPPING AND HANOLlNG 50 Pa9e CATALOGUE Op 5laa add 9159 St 60 PP IA copy will $601 Ia $2006 add 5225 sent free upon 26Ot 54560 add $300 request witS ordnril $0501 $7010 add $350 y rice aver 57000 add 55 po Boa 306i1 CA Addressees add 60 Tan Seal Beach Ga 93746 Serd 510 VisaAtC 16- EnpI l 7i51 896a223lBest GK COO Eeact COg warnings recarder 50 1-141 IGash Only adtisates S rinqsl Hobbi Shack SUPERMARKET OF HOBBY GOODS SUPER DISCOUNTS PRICES GOOD THRU MAY 82 COXTD049or051 $1747 049 NO 553602 051 NO 553610 HOUSE BALSA 2x2 NO 576377 LIST $2495 1567 DEVCON 5-MINUTE EPOXY NO 566281 LIST $999$576 0-MIDWEST SWEETN LOW NO 569053 LIST $5695. 99 FUTABA SAVINGS FP-4L 3 S26 servos -NO711862eaa LIST $19995 FP-7 FG K jfi with 4 S-26 servos NO 712356 $2499 LIST $39995 9 HUNDREDS MORE SUPER VALUES AND INTERESTING MODEL ARTICLES FREE y Shack customers ceive 32 age SPORT FLYER regularly would like copy simply write us ask FUJI 099 R/C NO 120618 LIST $31 95$1799 PMP THERMAL 73 NO 541492 LIST $2995 788 S HOBBY SHACK HEAT GUN NO 110445 LIST $3295 1499 I0 name address city I statezip U mail order catalogs 18480 BANDILIER CIRCLE 1FOUNTAINVALLEYCA9287081 frequency receiver Jack Albrecht AMA Frequency Committee has taken image problems account making draft Phase-In Plan frequency usage plan followed wont able buy systems suffer image problems leaves 7208/7296 problem familiar will go away five years Till know about careful Some folks already have scanners non-RC bands question bound asked Can use scanner RC answer according John Lange Yes proper converter Once again contact John address call sign given early column precise information need Finally direct attention back cheapest solution could come u ctronic Bird-Dog published Radio Technique January 1982 will monitor channel receiver will monitor very well draws about 300mA order heard above noise engines field wouldnt want leave plugged flight pack very long will completely discharge usual 500 mAh pack less two hours intend con tinuousmonitoring Bird-Dog puta 100ohm resistor series loudspeaker should cut current drain down about 35 mA Keep letters flowing George M Miers 70 Froehlich Farm Rd HieksiiIle NY 11801________ SAFE FLYING IS NO ACCIDENT Neighvion/ Randolph Continued page 35 will find can taxi out spot stop apply power takeoff just would larger plane Dont hurry rotate first flight Apply slight back stick let Neighvion fly off Climb straight out level off trim out original required slight up left trim initial flight Landings quite easy Come back power fly pattern ease off power just before touch-down Smooth time Neighvion smooth solid flier Props Brown lee Con ftnued page 37 l/N As shall see later performance will affected critically pitch long diameter correct let engine develop its maximum power computation purposes value 125 suggested Results obtained using Eq 2 will no better mph value used leads purpose number three starting point equilibrium condition available thrust equals total airframe drag engineering terms Power Out tx velocIty4 Efficiency E r In550 x hp 550 x hp x E thereforeTv4a DCDxOOll9xv2xS5 CD airframe drag coefficient based wing area V velocity feet-per-second S wing area square feet 1 28 Model Aviation GOITIOLINI TEND PROFILE0 COMBA RA T WIDE & NARROW WEDGE 15 -- 6 os Capacities UNIFLOW & TINDD Custom 31il lush Ingredients deraited brochure50C stamps/check CAROLINA TAFFINDER 8345 Delhi Road Charleston Hgts SC 29405 h THE NELSON 15. UN4 VES TION4IL Y THE lEST QUARTER MIDGET AMA C PAl PLUS THE TEXAS 3O complete information Write Kus torn Kraftsmanship Brochure PO Box 2699 Laguna Hills CA 92653 Call f7 14 830-5 162 Dealer inquiries invited IN STOCK FOR IMMEDIATE SHIPMENT NewSUPER QUADRA$9995 wth BRISIGHELLA FLYWHEEL$11995 QUADRA REPAIR51000 plot pent KIORITZ engine 244 c in519995 PUW RADIAL ENGINES FleerS2295 Jorr M ester ERCOUPEPLANS S2395 KIT S22995 Jier M TOMAHAWKPLANS $2395 KIT S245 95 BALSA BASSWOOD oil sicen35% OFF Concept FLEETKIT 517995 F 0 CoW $1995 QUADRA foel tonkO16 0 5695 32 oe S795 VICKERSor LEWIS MACHINE GUN KITS51499 10 RED WHEELS USA Pop$2595 PLANS SUPER STEARMAN reyS250O STARDUSTER TOO ghelleS29 95 scale J-3 CUB Nelde$2995 VDLKSPLANE ken ChorIreS2395 FLY BABY $1696 56-5 ch524RR COCKPIT KITS Tocehewk F4U-1 SprtfrreS21 95 Ercoope $1795 Steerroen 52G 95 Creebrie $2495 I-3 Cob 51950 ME-lOS $21 50 Fleet $1995 FIBERGLASS ARROW SHAFTS 5/16 032 1g6/51000 24-Hour Service. Add $250 postage Send Bank Check Money Order JIM MESSERS QUALITY MODEL PRODUCTS 106 Valley View Dr Allegany NY 14706
Edition: Model Aviation - 1982/07
Page Numbers: 26, 27, 28, 125, 128
Radio Techniq George M Myers ue NEW FREQUENCIES OLD FREQUEN CIES AND SCANNERS As write seems pretty likely will have new fre quencies available 1983 season brings up two thoughts Frequency Monitoring Frequency Control Frequency Monitoring means listening what going RC channel propose use before turn transmitter Frequency Control means making some kind provision assure no else tries use same channel using World Engines put scanning monitor market some time ago didnt sell particularly well bought didnt use much reason using scanner cant hear above noise engine also lot carping about fact order get away local effects related strength signal trans mitters flight line monitor located reasonable distance away meant couldnt fly monitor too Finally scanning monitor idea suffered fact monitor receiver working ground level short antenna simply couldnt hear same interference plane could several hundred feet above field com plaints really valid Well see moment First what about future see two problem areas Continued use seven existing evennumbered 72-76 MHz frequencies face ever-increasing interference during 5-year grandfather period would expect such users would find scanner become virtually necessity just make flying possible 2 Beginning use large number oddnumbered 7 2-76 MHz frequencies face certain interference some ofthem justification giving us first place scanner will tell channels avoid particular part world should guide purchasing deci sions What kinds interference likely en counter Obviously interference another modeler same channel number problem clothespin idea has proven work everyone follows religiously trouble everyone does rye seen dozens good ideas presented purpose frequency control break down some independent jerk wont play rules Theres always guy atthe field wont put clip antenna fear scratching insists can run up engine make control adjustments transmitter antenna collapsed wont hurt anybody dont have problems youve got contend guy forgets Scanner duty Its showing intermodulation 72400 two transmitters operating 72240 72080 simultaneously Note signal strength meter indicates intermodulation signal very weak 26 Model Aviation looks frequency flag misinterprets color theres problem trans mitter thats left ON Somebody always gets hurt Proper use scanner could eliminate some problems Next interference list would inter ference some commercial user Mr John R Lange 1700 North 37th Ave Stone Park IL 60165 has telling experience monitoring interference over year John manufacturer three kits converters described Receiving Converters RC Fre quencies Model Aviation February 1982 p 36 letters continuously update informa tion gaining sitting quietly listening . car radio hooked up converters driving Ham receiver home Johns call K9ARA Hams out might want give him shout see what latest findings John finding lot activity bands interesting part activity inter mittent somewhat randomly-spaced time As far monitor concerned have sit listen long time before can have confidence know what likely happen brief pause monitor receiver just before turning tolly isn tgood enough dont get anything else column go hack read last sentence until under stand After weve dealt primary interferences described above still have intermodulation occasionally image problems deal scanning monitor will reveal inter modulation time image conditions right spoke intermodulation image Electronic Bird-Dog column January 1982 p 30 referring contributions AMA Frequency Committee Member Bill Hersch berger printed AMA News January 1981 Briefly intermodulation inter ference occurs signals two differ ent transmitters enter RF section receiver beat against another produce signal third channelwhich happens trying use photo shows Airtronics scanner sent evaluation photo transmitters 7208 Bn/Wh 7224 R/Wh intermodulating produce input 7240 Or/Wh scanner indicates lighting three LEDs two should lit Airtronics scanner shows presence signal four different ways First loudspeaker makes BRRR sound receiving AM RC signal Next row LEDs latch ON receiving sufficiently strong signal strength received signal presented meter Finally attached whip antenna can posi tioned anywhere hemisphere indications alone important Comparison between tham also important photo scanner shows what happens stop scanning affected channel 7240 case hear BRRR see LED lit see signal-strength meter zero able deduce intermodulation inter ference present 7240 relative signal strength very low therefore actual interference should minimal long model airplane 7240 does pass very close intermodulating transmitters reason last statement trans mitters signal strength perceived receiver varies inversely distance between model 7240 far its proper trans mitter passes very close intermodulat ing 7208 7224 transmitters intermodulation result can stronger tended control signal Refer back original articles RT January 1982 issue Bill Hershbergers Togetherness Can Bring Glitches article January 1981 AMA News find rest combinations can may now wondering Just bow far away will scanner pick up transmitter frequency order find out left son Tim bythesideofalong straight flatroad holding Airtronics XLtransmitteras flying gave signal reference taped scanner hood car could keep eye meter driving extended antenna vertically drove away Tim stopping occasionally turn off engine record data table cars odometer gave distance measurements scanner has signal strength meter cali brated linearly 0 8 units unspecified meter dropped less linearly distance value 075 miles Once down toO meter stayed distance increased further row LEDs show frequency being monitored lighting monitoring taking July 198227 Multi Charger b7 e Power Pacer New H S Hornet 2 CID 6 1/3 HP Only 6 1/4 lbs So compact measures much larger Quadra Partner engine Comes complete built-in choke &-bolt prop hub Radial mount twin stack available List $28995 INTRO $19995 Youll Love Partner An updated version popular engine Note improve ments mode especially mini ature aircraft use roller thruse bearing double-ring piston soerk nba location low 13 1/21 power output LiMITED TIME OFFER LIST $14995 SALE $8995 Nrni too piflrw stat cord crate Hatdotr Prop hob MORE HORIJER SPECIALS PART RETAILSALE RADIAL MOUNT Rapa3 797Sj103 RADIAL MOUNTPamaeC123 TWIN STACK EXHAUST 37 & Kierira105 109$9500$2995TWIN STACK EXHAUST Pavaer Oeadro120 1122499518900CHOKE ASSEMBLVPaflearN Onadno121 lOB725009995BRITE SPINNER Raper Pt N Ocad122 1196500NEOPRENE GAS LINE Par Poor107 to25 00RESISTOR SPARK PLUG RCJ-6113 RIG PROPS AVAILABLEi Finiahed aed BaIaread Wood tOt1495 102995 SALE $17995 SALE 12 55 1200 2495 1995 5 00 tvss 95 2 50 Write CALc secRete aPER Super rower Panel QUALITY EQUIPMENT THAT FILLS ALL OF THE ELECTRICAL NEEDS OF YOUR RIC ACCESSORIES L R Taylor & Co 2ntact DeZ oe plaCG strong enough signal detected thG LED latches ON until next scan Latching ceased about 075 miles loudspeaker sounds detected modulation signal volume control adjusts sound level used Radio Shack sound level meter measure output sound level order exclude ambient noise much possible put microphone directly over loudspeaker laying sound level meter top scanner gives rise measurement seems much louder really Ambient noise 100 dB like sound rivet gun scanner isnt really loud found sound level corresponding dis tortion about 102 dB obtained volume-control dial setting 25 dial marked 0 5 equal undefined incre ments Driving away Tim measurement held 102 dB dial setting of25 way out 030 miles necessary start increasing dial setting linearly distance maintain 102 dB level 075 miles volume control 5 distance outward sound level dropped drop seemed follow inverse-square law should until signal lost back ground noise about 19 miles above can deduce scanner picking up Tims transmitter far beyond point could see what holding fact three flying Sites use locally mutually less 15 miles apart crow flies may deduce scanner can reagh out far has order detect other transmitters ground level might affect flying put idea way because weve using fields several years en countering unusual amount unexplained interference fact time has interference far juSt happened no flying other fields frequency being affected 15 miles can occasionally get glimpse light flashing off MonoKote sun right can see another flyingmore less Since rare airplane stray 2000 feet owners transmitter because hard see way going relative signal strength identical transmitter other field never better 6% owners signal Thats like noise interference above measurements have convinced Airtronics scanner useful tool hope convinced too important thing to learn use tool properly Far too folks know will turn transmitters hold within two three antenna lengths monitor complain because several LEDs light up Sure sensitive instrument youre overloading something like want monitor flying field monitor wants 500 1 000 feet away flight line means youll need CB communications theyre pretty common days guy scanner should car CB portable unit pits can provide other end conversation will volunteer monitoring frequency use everybody will benefit no will give up anything opportunity BS little given two-way conversa tion CB dont have give up As might expect Airtronics scanner self-contained portabJe can powered alkaline pencells eight hours Ni-Cds five Con tin ued page 125 28 Model Aviation MIt Anseninac Power Eqoip co Kawasaki Homers Smooth One. 222 CID Sale $17995 315 CID Sale $19499 Comes 6-bolt hub built-in choke Twin stack mount optional Like Quadra Optw.l Oai-tch eer tech oroi omihk Sehcrice aesihhl Oohl-rig pius Ie hi1he coepesois S isgsr lit Optiosti chah Est hood oOrtiru Spsoisl nleo.coplithigheeois orotsa I. ec esitisli. Sslid-hst typs iso op tiosl sdisl spit cell tloot-huri9 eolsoiclt Icr s.i ossdi circuIt Pohslod lisrewcot eh.l 19 ROPER ENGINE CLOSE OUT SALE WHILE THEY LAST 37 SUPER POWER ROPER 22 DUADRA ENGINE 19 ENGINE HUB ft MOUNT PACK 18 USED DEMO ENGINE BALENCED 6-BOLT HUB Ropa Porno, ft Otaedeaj PROP DRILL JIIS love 24 wI optional choke Send 20c Stamp far Catalogiwill Ship Orders Same Oay 1200UPSAud 54 shippiiis per engivr HOR N ER SALES INC Rt 2 Box 9300 Dixie Hwy. 312 946-2515 Beecher IL 60401 THE QUALITY LINETh OF RIC ELECTRONICS vance J*4 5-- 20831 Roscoc Blvd Canoga Park California 91306 213 360-1178 THINK FOX N N Weve Got Support Hardware 2 Vo G ow P ugs Dry Cell Nickel Cad 2 Vo G ow P ugs Lead Acid Battery THE FOX GLOW PLUGS #601061 oentiorral Spinner $1200 #601071 oentional Spinner 1300 #60100 2 Conventional Spinner1400 #601092Conoentonal Spinnei 1500 -#601102 s Co entional Spinner 1600 AlI t FOX POLISHED SPINNERS Offered Three Attractive Styles Conventional Slim Jim / Conical #6020610linrJiinSpnnei$1300 #602071OliieJreopinner 1400 #60206 2 Olin lie Spinner1500 #602092SliiedirnSpinn#r 1600 #602102iOliieJireOpinner 1750 #603061 cal Spinner $t2 00 #603071 Conicat Spinner t3 06 #60300 2 Conical Spinner1400 #603092 cal Spinner 1500 #603102Conca Opener 1600 SPINNER NUTS #60503 03200 neerNoi $200 #60504 1 4 Op cnn Net225 #40101 StandardShort51 beach#doto3Standard Short$1l9nach #40201 Standard Long1 19 each#40203 Standard Long1 19 646502 RiG ShOrt 169 each#40503 RIG ShOrt 169 #40602 PlC Long 1 69 each940603 RIG Long 169 FOX PROP REAMERS Enlarge Prop Shaft Holes larger sizes required can fieldi FOURWAY &FOX ENGINE MOUNTS #OO2lOkErngelehtoant 1506 5 000 TWOWAYRugged Machined Bar Stocke504oiFrirreMoant1217906 #50402 Engine MOont 1 281900 #50403 Engine MoontI 320900 FOX WRENCHESFXEngine Mood1305900 #701012 Wa0 W ench 316 Shall$225501 6 6 656MFG Co#50601 Engine MOunt 14751000 #7OtO22WayW enchi 4 Shalt225#60603 Engine Mount 16401000 #70103 2-Way Wrench 5I16Ohait 0225 5355 Towscn Ace Fort Smith Arkuosas 72901 #50604 Engine Ictoont t 750 1000 #70104 POor Way Wrench795 Reamers & Wrenches Plugs & Mounts & Spinners flying Quarter Scale Aristocrat Fredericks burg last year doubt arose about transmitter batteries Bill Kaluf MEN charger able within 60 seconds conftrm batteries indeed OK 1982 will always year Pac Man gobbled up Ive never trouble batteries before go circles three weeks traumatic almost began scream Give Rubber Power give death Bill Winter 4426 Altura Ct Fairfax VA 22030 Radio Technique/Myers Continued iaqe 28 hours charger plugs cigarette lighter car Doug Pratt has running Airtronics scanner AMA head quarters building downtown DC using Airtronics transmitter charger power theres voltage regulator scanner takes care fact transmitter charger puts out eight cells scanner has four Doug has picked ups variety signals thats OK because no flies RC downtown DC tried same setup house Hicks ville detected nothing Interference find took scanner road found place could hear musical tones sounded bit like pushbutton telephone signals also heard voices time time laid whip antenna parallel ground way us have antennas planes days found strong BRRR signals over flying field no flying also found same signal other places So far havent identified source think its some kind computer data transmission dozens tall towers within sight flying fields sport kinds antennas whips dishes things hidden radomes detect interference have run over scanner stop scan affected channel working AUTO MANUAL switch have compare sound way antenna pointing LEDs meter want learn anything must log time describe whatever have heard After youll build up file channels monitoring now scanner monitors 7208 7216 7224 7232 7240 7296 7564 future Should simple matter monitor others crystal swapping Bandwidth may become slight problem monitoring new frequencies doubt will significant AMA draft Phase-In Plan puts new frequencies 40 KHzapartsee RT April 1982 has demonstrated acceptable existing receiver designs such Airtronics instrument contains Any way look scanning monitor will helpful trying years immediately ahead agree want buy write directly Airtronics 12160 Woodruff Ave. Downey CA 90241 telephone 213 862 6583 may wonder danced neatly away image problems begin image problems rare encounter receiver situated frequency basis midway between two transmitters separated exactly double IF intermediate Cootinued oI page 128 July 1982 125 #70201 FOX 4-step Reamer #70202 FOX KNO Reamer moot purposes$695 icr KER Ohait sioeh 0095 HObbV B0~ habln rprazlniri TIMER KITS tOut1 Partial Kits P & W Oenri-Ruts--Rib Tip Fiurmer Kilo 1941 Playboy Jr 54ii Span 101cc Extra $1456 Plan--$2 50 Gomparuon Strepanod iiKitii~$l3 12 Coabloatian Playboy Jr tall abov# ilnms$2# 00 1641 Playboy Sr #o span Plan Eatrat $1925 Plan-$360 Companion Slpwond Kit $2636 Combination Playboy Sr-tall three itecis $4500 1939 Zipper Comet 54ii Span Plan Inol $3360 Companion Stripanod Kit- $1572 combination Zipper tBotB above iinms--545Ot 1937 flaIls/re Sportster 100 Span Plan EX $2600 Plan--55 09 Companion Stripisood Kit-$35 06 Combination Dallairn Kit oIl three ilemsl-$56 00 1930 Powerhouse #4 Span Plan Extra $3106 Pian--$450 Companion Stripeond Kit- $1776 Combination Poinerhouse Kit tall 3 aboVe $3900 Other cooibinations available-- 1930 Buccanenr$49 00 1936 Clipper 51K 1 $3860 1939 Mercury $5506 1935 Miss Airierica 5s90a 1940 Ranger $2100 1040 Sailplane $7000 1040 So Long $2690 1930 Tendon rerror $3000 Korita Woke $1600 AIIOIOAP MODEL COMPANY Partial Kilo 1936 Plying Quaker #4 Span Plan Inol $2156 Companion Stripwood Kit -$3140 Combinalino Plying Quaker Kit tBolhilems$4#00 1937 Quoker PIrish 07 Span Plan lcd $57St Companion Stripmood Kit--52345 Combination Quaker Plash Kit Both items $3000 1937 Long Cabin 70 Span Plan Extra $1560 Plan- $500 Companion Stripmood Kil-$2456 Combination Lang Cabin Kit tall tbree--$4100 MdOWAY MOOEL COMPANY Poll Rita 0936 Air Trails Sportsler 50 16- 15 H/C $3506 1036 Pomerhouoe 50 Span l0-lh H/C $3596 1940 Buazard Bombshell 30 Span 036 $1195 1940 Playbcy Sr pun 020 engines $129 163$ Miss America 36 Span 020 engines $t2951940 Clipper WRIt 36 Span 020 engines 5t495 1940 New Ruler 31 Span 620 engines $1301 1940 Mercury Scientifics 36 span 020 $1395 1941 Request 30 Span 029 engines $1291 SHIPPING AND HANOLlNG 50 Pa9e CATALOGUE Op 5laa add 9159 St 60 PP IA copy will $601 Ia $2006 add 5225 sent free upon 26Ot 54560 add $300 request witS ordnril $0501 $7010 add $350 y rice aver 57000 add 55 po Boa 306i1 CA Addressees add 60 Tan Seal Beach Ga 93746 Serd 510 VisaAtC 16- EnpI l 7i51 896a223lBest GK COO Eeact COg warnings recarder 50 1-141 IGash Only adtisates S rinqsl Hobbi Shack SUPERMARKET OF HOBBY GOODS SUPER DISCOUNTS PRICES GOOD THRU MAY 82 COXTD049or051 $1747 049 NO 553602 051 NO 553610 HOUSE BALSA 2x2 NO 576377 LIST $2495 1567 DEVCON 5-MINUTE EPOXY NO 566281 LIST $999$576 0-MIDWEST SWEETN LOW NO 569053 LIST $5695. 99 FUTABA SAVINGS FP-4L 3 S26 servos -NO711862eaa LIST $19995 FP-7 FG K jfi with 4 S-26 servos NO 712356 $2499 LIST $39995 9 HUNDREDS MORE SUPER VALUES AND INTERESTING MODEL ARTICLES FREE y Shack customers ceive 32 age SPORT FLYER regularly would like copy simply write us ask FUJI 099 R/C NO 120618 LIST $31 95$1799 PMP THERMAL 73 NO 541492 LIST $2995 788 S HOBBY SHACK HEAT GUN NO 110445 LIST $3295 1499 I0 name address city I statezip U mail order catalogs 18480 BANDILIER CIRCLE 1FOUNTAINVALLEYCA9287081 frequency receiver Jack Albrecht AMA Frequency Committee has taken image problems account making draft Phase-In Plan frequency usage plan followed wont able buy systems suffer image problems leaves 7208/7296 problem familiar will go away five years Till know about careful Some folks already have scanners non-RC bands question bound asked Can use scanner RC answer according John Lange Yes proper converter Once again contact John address call sign given early column precise information need Finally direct attention back cheapest solution could come u ctronic Bird-Dog published Radio Technique January 1982 will monitor channel receiver will monitor very well draws about 300mA order heard above noise engines field wouldnt want leave plugged flight pack very long will completely discharge usual 500 mAh pack less two hours intend con tinuousmonitoring Bird-Dog puta 100ohm resistor series loudspeaker should cut current drain down about 35 mA Keep letters flowing George M Miers 70 Froehlich Farm Rd HieksiiIle NY 11801________ SAFE FLYING IS NO ACCIDENT Neighvion/ Randolph Continued page 35 will find can taxi out spot stop apply power takeoff just would larger plane Dont hurry rotate first flight Apply slight back stick let Neighvion fly off Climb straight out level off trim out original required slight up left trim initial flight Landings quite easy Come back power fly pattern ease off power just before touch-down Smooth time Neighvion smooth solid flier Props Brown lee Con ftnued page 37 l/N As shall see later performance will affected critically pitch long diameter correct let engine develop its maximum power computation purposes value 125 suggested Results obtained using Eq 2 will no better mph value used leads purpose number three starting point equilibrium condition available thrust equals total airframe drag engineering terms Power Out tx velocIty4 Efficiency E r In550 x hp 550 x hp x E thereforeTv4a DCDxOOll9xv2xS5 CD airframe drag coefficient based wing area V velocity feet-per-second S wing area square feet 1 28 Model Aviation GOITIOLINI TEND PROFILE0 COMBA RA T WIDE & NARROW WEDGE 15 -- 6 os Capacities UNIFLOW & TINDD Custom 31il lush Ingredients deraited brochure50C stamps/check CAROLINA TAFFINDER 8345 Delhi Road Charleston Hgts SC 29405 h THE NELSON 15. UN4 VES TION4IL Y THE lEST QUARTER MIDGET AMA C PAl PLUS THE TEXAS 3O complete information Write Kus torn Kraftsmanship Brochure PO Box 2699 Laguna Hills CA 92653 Call f7 14 830-5 162 Dealer inquiries invited IN STOCK FOR IMMEDIATE SHIPMENT NewSUPER QUADRA$9995 wth BRISIGHELLA FLYWHEEL$11995 QUADRA REPAIR51000 plot pent KIORITZ engine 244 c in519995 PUW RADIAL ENGINES FleerS2295 Jorr M ester ERCOUPEPLANS S2395 KIT S22995 Jier M TOMAHAWKPLANS $2395 KIT S245 95 BALSA BASSWOOD oil sicen35% OFF Concept FLEETKIT 517995 F 0 CoW $1995 QUADRA foel tonkO16 0 5695 32 oe S795 VICKERSor LEWIS MACHINE GUN KITS51499 10 RED WHEELS USA Pop$2595 PLANS SUPER STEARMAN reyS250O STARDUSTER TOO ghelleS29 95 scale J-3 CUB Nelde$2995 VDLKSPLANE ken ChorIreS2395 FLY BABY $1696 56-5 ch524RR COCKPIT KITS Tocehewk F4U-1 SprtfrreS21 95 Ercoope $1795 Steerroen 52G 95 Creebrie $2495 I-3 Cob 51950 ME-lOS $21 50 Fleet $1995 FIBERGLASS ARROW SHAFTS 5/16 032 1g6/51000 24-Hour Service. Add $250 postage Send Bank Check Money Order JIM MESSERS QUALITY MODEL PRODUCTS 106 Valley View Dr Allegany NY 14706
Edition: Model Aviation - 1982/07
Page Numbers: 26, 27, 28, 125, 128
Radio Techniq George M Myers ue NEW FREQUENCIES OLD FREQUEN CIES AND SCANNERS As write seems pretty likely will have new fre quencies available 1983 season brings up two thoughts Frequency Monitoring Frequency Control Frequency Monitoring means listening what going RC channel propose use before turn transmitter Frequency Control means making some kind provision assure no else tries use same channel using World Engines put scanning monitor market some time ago didnt sell particularly well bought didnt use much reason using scanner cant hear above noise engine also lot carping about fact order get away local effects related strength signal trans mitters flight line monitor located reasonable distance away meant couldnt fly monitor too Finally scanning monitor idea suffered fact monitor receiver working ground level short antenna simply couldnt hear same interference plane could several hundred feet above field com plaints really valid Well see moment First what about future see two problem areas Continued use seven existing evennumbered 72-76 MHz frequencies face ever-increasing interference during 5-year grandfather period would expect such users would find scanner become virtually necessity just make flying possible 2 Beginning use large number oddnumbered 7 2-76 MHz frequencies face certain interference some ofthem justification giving us first place scanner will tell channels avoid particular part world should guide purchasing deci sions What kinds interference likely en counter Obviously interference another modeler same channel number problem clothespin idea has proven work everyone follows religiously trouble everyone does rye seen dozens good ideas presented purpose frequency control break down some independent jerk wont play rules Theres always guy atthe field wont put clip antenna fear scratching insists can run up engine make control adjustments transmitter antenna collapsed wont hurt anybody dont have problems youve got contend guy forgets Scanner duty Its showing intermodulation 72400 two transmitters operating 72240 72080 simultaneously Note signal strength meter indicates intermodulation signal very weak 26 Model Aviation looks frequency flag misinterprets color theres problem trans mitter thats left ON Somebody always gets hurt Proper use scanner could eliminate some problems Next interference list would inter ference some commercial user Mr John R Lange 1700 North 37th Ave Stone Park IL 60165 has telling experience monitoring interference over year John manufacturer three kits converters described Receiving Converters RC Fre quencies Model Aviation February 1982 p 36 letters continuously update informa tion gaining sitting quietly listening . car radio hooked up converters driving Ham receiver home Johns call K9ARA Hams out might want give him shout see what latest findings John finding lot activity bands interesting part activity inter mittent somewhat randomly-spaced time As far monitor concerned have sit listen long time before can have confidence know what likely happen brief pause monitor receiver just before turning tolly isn tgood enough dont get anything else column go hack read last sentence until under stand After weve dealt primary interferences described above still have intermodulation occasionally image problems deal scanning monitor will reveal inter modulation time image conditions right spoke intermodulation image Electronic Bird-Dog column January 1982 p 30 referring contributions AMA Frequency Committee Member Bill Hersch berger printed AMA News January 1981 Briefly intermodulation inter ference occurs signals two differ ent transmitters enter RF section receiver beat against another produce signal third channelwhich happens trying use photo shows Airtronics scanner sent evaluation photo transmitters 7208 Bn/Wh 7224 R/Wh intermodulating produce input 7240 Or/Wh scanner indicates lighting three LEDs two should lit Airtronics scanner shows presence signal four different ways First loudspeaker makes BRRR sound receiving AM RC signal Next row LEDs latch ON receiving sufficiently strong signal strength received signal presented meter Finally attached whip antenna can posi tioned anywhere hemisphere indications alone important Comparison between tham also important photo scanner shows what happens stop scanning affected channel 7240 case hear BRRR see LED lit see signal-strength meter zero able deduce intermodulation inter ference present 7240 relative signal strength very low therefore actual interference should minimal long model airplane 7240 does pass very close intermodulating transmitters reason last statement trans mitters signal strength perceived receiver varies inversely distance between model 7240 far its proper trans mitter passes very close intermodulat ing 7208 7224 transmitters intermodulation result can stronger tended control signal Refer back original articles RT January 1982 issue Bill Hershbergers Togetherness Can Bring Glitches article January 1981 AMA News find rest combinations can may now wondering Just bow far away will scanner pick up transmitter frequency order find out left son Tim bythesideofalong straight flatroad holding Airtronics XLtransmitteras flying gave signal reference taped scanner hood car could keep eye meter driving extended antenna vertically drove away Tim stopping occasionally turn off engine record data table cars odometer gave distance measurements scanner has signal strength meter cali brated linearly 0 8 units unspecified meter dropped less linearly distance value 075 miles Once down toO meter stayed distance increased further row LEDs show frequency being monitored lighting monitoring taking July 198227 Multi Charger b7 e Power Pacer New H S Hornet 2 CID 6 1/3 HP Only 6 1/4 lbs So compact measures much larger Quadra Partner engine Comes complete built-in choke &-bolt prop hub Radial mount twin stack available List $28995 INTRO $19995 Youll Love Partner An updated version popular engine Note improve ments mode especially mini ature aircraft use roller thruse bearing double-ring piston soerk nba location low 13 1/21 power output LiMITED TIME OFFER LIST $14995 SALE $8995 Nrni too piflrw stat cord crate Hatdotr Prop hob MORE HORIJER SPECIALS PART RETAILSALE RADIAL MOUNT Rapa3 797Sj103 RADIAL MOUNTPamaeC123 TWIN STACK EXHAUST 37 & Kierira105 109$9500$2995TWIN STACK EXHAUST Pavaer Oeadro120 1122499518900CHOKE ASSEMBLVPaflearN Onadno121 lOB725009995BRITE SPINNER Raper Pt N Ocad122 1196500NEOPRENE GAS LINE Par Poor107 to25 00RESISTOR SPARK PLUG RCJ-6113 RIG PROPS AVAILABLEi Finiahed aed BaIaread Wood tOt1495 102995 SALE $17995 SALE 12 55 1200 2495 1995 5 00 tvss 95 2 50 Write CALc secRete aPER Super rower Panel QUALITY EQUIPMENT THAT FILLS ALL OF THE ELECTRICAL NEEDS OF YOUR RIC ACCESSORIES L R Taylor & Co 2ntact DeZ oe plaCG strong enough signal detected thG LED latches ON until next scan Latching ceased about 075 miles loudspeaker sounds detected modulation signal volume control adjusts sound level used Radio Shack sound level meter measure output sound level order exclude ambient noise much possible put microphone directly over loudspeaker laying sound level meter top scanner gives rise measurement seems much louder really Ambient noise 100 dB like sound rivet gun scanner isnt really loud found sound level corresponding dis tortion about 102 dB obtained volume-control dial setting 25 dial marked 0 5 equal undefined incre ments Driving away Tim measurement held 102 dB dial setting of25 way out 030 miles necessary start increasing dial setting linearly distance maintain 102 dB level 075 miles volume control 5 distance outward sound level dropped drop seemed follow inverse-square law should until signal lost back ground noise about 19 miles above can deduce scanner picking up Tims transmitter far beyond point could see what holding fact three flying Sites use locally mutually less 15 miles apart crow flies may deduce scanner can reagh out far has order detect other transmitters ground level might affect flying put idea way because weve using fields several years en countering unusual amount unexplained interference fact time has interference far juSt happened no flying other fields frequency being affected 15 miles can occasionally get glimpse light flashing off MonoKote sun right can see another flyingmore less Since rare airplane stray 2000 feet owners transmitter because hard see way going relative signal strength identical transmitter other field never better 6% owners signal Thats like noise interference above measurements have convinced Airtronics scanner useful tool hope convinced too important thing to learn use tool properly Far too folks know will turn transmitters hold within two three antenna lengths monitor complain because several LEDs light up Sure sensitive instrument youre overloading something like want monitor flying field monitor wants 500 1 000 feet away flight line means youll need CB communications theyre pretty common days guy scanner should car CB portable unit pits can provide other end conversation will volunteer monitoring frequency use everybody will benefit no will give up anything opportunity BS little given two-way conversa tion CB dont have give up As might expect Airtronics scanner self-contained portabJe can powered alkaline pencells eight hours Ni-Cds five Con tin ued page 125 28 Model Aviation MIt Anseninac Power Eqoip co Kawasaki Homers Smooth One. 222 CID Sale $17995 315 CID Sale $19499 Comes 6-bolt hub built-in choke Twin stack mount optional Like Quadra Optw.l Oai-tch eer tech oroi omihk Sehcrice aesihhl Oohl-rig pius Ie hi1he coepesois S isgsr lit Optiosti chah Est hood oOrtiru Spsoisl nleo.coplithigheeois orotsa I. ec esitisli. Sslid-hst typs iso op tiosl sdisl spit cell tloot-huri9 eolsoiclt Icr s.i ossdi circuIt Pohslod lisrewcot eh.l 19 ROPER ENGINE CLOSE OUT SALE WHILE THEY LAST 37 SUPER POWER ROPER 22 DUADRA ENGINE 19 ENGINE HUB ft MOUNT PACK 18 USED DEMO ENGINE BALENCED 6-BOLT HUB Ropa Porno, ft Otaedeaj PROP DRILL JIIS love 24 wI optional choke Send 20c Stamp far Catalogiwill Ship Orders Same Oay 1200UPSAud 54 shippiiis per engivr HOR N ER SALES INC Rt 2 Box 9300 Dixie Hwy. 312 946-2515 Beecher IL 60401 THE QUALITY LINETh OF RIC ELECTRONICS vance J*4 5-- 20831 Roscoc Blvd Canoga Park California 91306 213 360-1178 THINK FOX N N Weve Got Support Hardware 2 Vo G ow P ugs Dry Cell Nickel Cad 2 Vo G ow P ugs Lead Acid Battery THE FOX GLOW PLUGS #601061 oentiorral Spinner $1200 #601071 oentional Spinner 1300 #60100 2 Conventional Spinner1400 #601092Conoentonal Spinnei 1500 -#601102 s Co entional Spinner 1600 AlI t FOX POLISHED SPINNERS Offered Three Attractive Styles Conventional Slim Jim / Conical #6020610linrJiinSpnnei$1300 #602071OliieJreopinner 1400 #60206 2 Olin lie Spinner1500 #602092SliiedirnSpinn#r 1600 #602102iOliieJireOpinner 1750 #603061 cal Spinner $t2 00 #603071 Conicat Spinner t3 06 #60300 2 Conical Spinner1400 #603092 cal Spinner 1500 #603102Conca Opener 1600 SPINNER NUTS #60503 03200 neerNoi $200 #60504 1 4 Op cnn Net225 #40101 StandardShort51 beach#doto3Standard Short$1l9nach #40201 Standard Long1 19 each#40203 Standard Long1 19 646502 RiG ShOrt 169 each#40503 RIG ShOrt 169 #40602 PlC Long 1 69 each940603 RIG Long 169 FOX PROP REAMERS Enlarge Prop Shaft Holes larger sizes required can fieldi FOURWAY &FOX ENGINE MOUNTS #OO2lOkErngelehtoant 1506 5 000 TWOWAYRugged Machined Bar Stocke504oiFrirreMoant1217906 #50402 Engine MOont 1 281900 #50403 Engine MoontI 320900 FOX WRENCHESFXEngine Mood1305900 #701012 Wa0 W ench 316 Shall$225501 6 6 656MFG Co#50601 Engine MOunt 14751000 #7OtO22WayW enchi 4 Shalt225#60603 Engine Mount 16401000 #70103 2-Way Wrench 5I16Ohait 0225 5355 Towscn Ace Fort Smith Arkuosas 72901 #50604 Engine Ictoont t 750 1000 #70104 POor Way Wrench795 Reamers & Wrenches Plugs & Mounts & Spinners flying Quarter Scale Aristocrat Fredericks burg last year doubt arose about transmitter batteries Bill Kaluf MEN charger able within 60 seconds conftrm batteries indeed OK 1982 will always year Pac Man gobbled up Ive never trouble batteries before go circles three weeks traumatic almost began scream Give Rubber Power give death Bill Winter 4426 Altura Ct Fairfax VA 22030 Radio Technique/Myers Continued iaqe 28 hours charger plugs cigarette lighter car Doug Pratt has running Airtronics scanner AMA head quarters building downtown DC using Airtronics transmitter charger power theres voltage regulator scanner takes care fact transmitter charger puts out eight cells scanner has four Doug has picked ups variety signals thats OK because no flies RC downtown DC tried same setup house Hicks ville detected nothing Interference find took scanner road found place could hear musical tones sounded bit like pushbutton telephone signals also heard voices time time laid whip antenna parallel ground way us have antennas planes days found strong BRRR signals over flying field no flying also found same signal other places So far havent identified source think its some kind computer data transmission dozens tall towers within sight flying fields sport kinds antennas whips dishes things hidden radomes detect interference have run over scanner stop scan affected channel working AUTO MANUAL switch have compare sound way antenna pointing LEDs meter want learn anything must log time describe whatever have heard After youll build up file channels monitoring now scanner monitors 7208 7216 7224 7232 7240 7296 7564 future Should simple matter monitor others crystal swapping Bandwidth may become slight problem monitoring new frequencies doubt will significant AMA draft Phase-In Plan puts new frequencies 40 KHzapartsee RT April 1982 has demonstrated acceptable existing receiver designs such Airtronics instrument contains Any way look scanning monitor will helpful trying years immediately ahead agree want buy write directly Airtronics 12160 Woodruff Ave. Downey CA 90241 telephone 213 862 6583 may wonder danced neatly away image problems begin image problems rare encounter receiver situated frequency basis midway between two transmitters separated exactly double IF intermediate Cootinued oI page 128 July 1982 125 #70201 FOX 4-step Reamer #70202 FOX KNO Reamer moot purposes$695 icr KER Ohait sioeh 0095 HObbV B0~ habln rprazlniri TIMER KITS tOut1 Partial Kits P & W Oenri-Ruts--Rib Tip Fiurmer Kilo 1941 Playboy Jr 54ii Span 101cc Extra $1456 Plan--$2 50 Gomparuon Strepanod iiKitii~$l3 12 Coabloatian Playboy Jr tall abov# ilnms$2# 00 1641 Playboy Sr #o span Plan Eatrat $1925 Plan-$360 Companion Slpwond Kit $2636 Combination Playboy Sr-tall three itecis $4500 1939 Zipper Comet 54ii Span Plan Inol $3360 Companion Stripanod Kit- $1572 combination Zipper tBotB above iinms--545Ot 1937 flaIls/re Sportster 100 Span Plan EX $2600 Plan--55 09 Companion Stripisood Kit-$35 06 Combination Dallairn Kit oIl three ilemsl-$56 00 1930 Powerhouse #4 Span Plan Extra $3106 Pian--$450 Companion Stripeond Kit- $1776 Combination Poinerhouse Kit tall 3 aboVe $3900 Other cooibinations available-- 1930 Buccanenr$49 00 1936 Clipper 51K 1 $3860 1939 Mercury $5506 1935 Miss Airierica 5s90a 1940 Ranger $2100 1040 Sailplane $7000 1040 So Long $2690 1930 Tendon rerror $3000 Korita Woke $1600 AIIOIOAP MODEL COMPANY Partial Kilo 1936 Plying Quaker #4 Span Plan Inol $2156 Companion Stripwood Kit -$3140 Combinalino Plying Quaker Kit tBolhilems$4#00 1937 Quoker PIrish 07 Span Plan lcd $57St Companion Stripmood Kit--52345 Combination Quaker Plash Kit Both items $3000 1937 Long Cabin 70 Span Plan Extra $1560 Plan- $500 Companion Stripmood Kil-$2456 Combination Lang Cabin Kit tall tbree--$4100 MdOWAY MOOEL COMPANY Poll Rita 0936 Air Trails Sportsler 50 16- 15 H/C $3506 1036 Pomerhouoe 50 Span l0-lh H/C $3596 1940 Buazard Bombshell 30 Span 036 $1195 1940 Playbcy Sr pun 020 engines $129 163$ Miss America 36 Span 020 engines $t2951940 Clipper WRIt 36 Span 020 engines 5t495 1940 New Ruler 31 Span 620 engines $1301 1940 Mercury Scientifics 36 span 020 $1395 1941 Request 30 Span 029 engines $1291 SHIPPING AND HANOLlNG 50 Pa9e CATALOGUE Op 5laa add 9159 St 60 PP IA copy will $601 Ia $2006 add 5225 sent free upon 26Ot 54560 add $300 request witS ordnril $0501 $7010 add $350 y rice aver 57000 add 55 po Boa 306i1 CA Addressees add 60 Tan Seal Beach Ga 93746 Serd 510 VisaAtC 16- EnpI l 7i51 896a223lBest GK COO Eeact COg warnings recarder 50 1-141 IGash Only adtisates S rinqsl Hobbi Shack SUPERMARKET OF HOBBY GOODS SUPER DISCOUNTS PRICES GOOD THRU MAY 82 COXTD049or051 $1747 049 NO 553602 051 NO 553610 HOUSE BALSA 2x2 NO 576377 LIST $2495 1567 DEVCON 5-MINUTE EPOXY NO 566281 LIST $999$576 0-MIDWEST SWEETN LOW NO 569053 LIST $5695. 99 FUTABA SAVINGS FP-4L 3 S26 servos -NO711862eaa LIST $19995 FP-7 FG K jfi with 4 S-26 servos NO 712356 $2499 LIST $39995 9 HUNDREDS MORE SUPER VALUES AND INTERESTING MODEL ARTICLES FREE y Shack customers ceive 32 age SPORT FLYER regularly would like copy simply write us ask FUJI 099 R/C NO 120618 LIST $31 95$1799 PMP THERMAL 73 NO 541492 LIST $2995 788 S HOBBY SHACK HEAT GUN NO 110445 LIST $3295 1499 I0 name address city I statezip U mail order catalogs 18480 BANDILIER CIRCLE 1FOUNTAINVALLEYCA9287081 frequency receiver Jack Albrecht AMA Frequency Committee has taken image problems account making draft Phase-In Plan frequency usage plan followed wont able buy systems suffer image problems leaves 7208/7296 problem familiar will go away five years Till know about careful Some folks already have scanners non-RC bands question bound asked Can use scanner RC answer according John Lange Yes proper converter Once again contact John address call sign given early column precise information need Finally direct attention back cheapest solution could come u ctronic Bird-Dog published Radio Technique January 1982 will monitor channel receiver will monitor very well draws about 300mA order heard above noise engines field wouldnt want leave plugged flight pack very long will completely discharge usual 500 mAh pack less two hours intend con tinuousmonitoring Bird-Dog puta 100ohm resistor series loudspeaker should cut current drain down about 35 mA Keep letters flowing George M Miers 70 Froehlich Farm Rd HieksiiIle NY 11801________ SAFE FLYING IS NO ACCIDENT Neighvion/ Randolph Continued page 35 will find can taxi out spot stop apply power takeoff just would larger plane Dont hurry rotate first flight Apply slight back stick let Neighvion fly off Climb straight out level off trim out original required slight up left trim initial flight Landings quite easy Come back power fly pattern ease off power just before touch-down Smooth time Neighvion smooth solid flier Props Brown lee Con ftnued page 37 l/N As shall see later performance will affected critically pitch long diameter correct let engine develop its maximum power computation purposes value 125 suggested Results obtained using Eq 2 will no better mph value used leads purpose number three starting point equilibrium condition available thrust equals total airframe drag engineering terms Power Out tx velocIty4 Efficiency E r In550 x hp 550 x hp x E thereforeTv4a DCDxOOll9xv2xS5 CD airframe drag coefficient based wing area V velocity feet-per-second S wing area square feet 1 28 Model Aviation GOITIOLINI TEND PROFILE0 COMBA RA T WIDE & NARROW WEDGE 15 -- 6 os Capacities UNIFLOW & TINDD Custom 31il lush Ingredients deraited brochure50C stamps/check CAROLINA TAFFINDER 8345 Delhi Road Charleston Hgts SC 29405 h THE NELSON 15. UN4 VES TION4IL Y THE lEST QUARTER MIDGET AMA C PAl PLUS THE TEXAS 3O complete information Write Kus torn Kraftsmanship Brochure PO Box 2699 Laguna Hills CA 92653 Call f7 14 830-5 162 Dealer inquiries invited IN STOCK FOR IMMEDIATE SHIPMENT NewSUPER QUADRA$9995 wth BRISIGHELLA FLYWHEEL$11995 QUADRA REPAIR51000 plot pent KIORITZ engine 244 c in519995 PUW RADIAL ENGINES FleerS2295 Jorr M ester ERCOUPEPLANS S2395 KIT S22995 Jier M TOMAHAWKPLANS $2395 KIT S245 95 BALSA BASSWOOD oil sicen35% OFF Concept FLEETKIT 517995 F 0 CoW $1995 QUADRA foel tonkO16 0 5695 32 oe S795 VICKERSor LEWIS MACHINE GUN KITS51499 10 RED WHEELS USA Pop$2595 PLANS SUPER STEARMAN reyS250O STARDUSTER TOO ghelleS29 95 scale J-3 CUB Nelde$2995 VDLKSPLANE ken ChorIreS2395 FLY BABY $1696 56-5 ch524RR COCKPIT KITS Tocehewk F4U-1 SprtfrreS21 95 Ercoope $1795 Steerroen 52G 95 Creebrie $2495 I-3 Cob 51950 ME-lOS $21 50 Fleet $1995 FIBERGLASS ARROW SHAFTS 5/16 032 1g6/51000 24-Hour Service. Add $250 postage Send Bank Check Money Order JIM MESSERS QUALITY MODEL PRODUCTS 106 Valley View Dr Allegany NY 14706
Edition: Model Aviation - 1982/07
Page Numbers: 26, 27, 28, 125, 128
Radio Techniq George M Myers ue NEW FREQUENCIES OLD FREQUEN CIES AND SCANNERS As write seems pretty likely will have new fre quencies available 1983 season brings up two thoughts Frequency Monitoring Frequency Control Frequency Monitoring means listening what going RC channel propose use before turn transmitter Frequency Control means making some kind provision assure no else tries use same channel using World Engines put scanning monitor market some time ago didnt sell particularly well bought didnt use much reason using scanner cant hear above noise engine also lot carping about fact order get away local effects related strength signal trans mitters flight line monitor located reasonable distance away meant couldnt fly monitor too Finally scanning monitor idea suffered fact monitor receiver working ground level short antenna simply couldnt hear same interference plane could several hundred feet above field com plaints really valid Well see moment First what about future see two problem areas Continued use seven existing evennumbered 72-76 MHz frequencies face ever-increasing interference during 5-year grandfather period would expect such users would find scanner become virtually necessity just make flying possible 2 Beginning use large number oddnumbered 7 2-76 MHz frequencies face certain interference some ofthem justification giving us first place scanner will tell channels avoid particular part world should guide purchasing deci sions What kinds interference likely en counter Obviously interference another modeler same channel number problem clothespin idea has proven work everyone follows religiously trouble everyone does rye seen dozens good ideas presented purpose frequency control break down some independent jerk wont play rules Theres always guy atthe field wont put clip antenna fear scratching insists can run up engine make control adjustments transmitter antenna collapsed wont hurt anybody dont have problems youve got contend guy forgets Scanner duty Its showing intermodulation 72400 two transmitters operating 72240 72080 simultaneously Note signal strength meter indicates intermodulation signal very weak 26 Model Aviation looks frequency flag misinterprets color theres problem trans mitter thats left ON Somebody always gets hurt Proper use scanner could eliminate some problems Next interference list would inter ference some commercial user Mr John R Lange 1700 North 37th Ave Stone Park IL 60165 has telling experience monitoring interference over year John manufacturer three kits converters described Receiving Converters RC Fre quencies Model Aviation February 1982 p 36 letters continuously update informa tion gaining sitting quietly listening . car radio hooked up converters driving Ham receiver home Johns call K9ARA Hams out might want give him shout see what latest findings John finding lot activity bands interesting part activity inter mittent somewhat randomly-spaced time As far monitor concerned have sit listen long time before can have confidence know what likely happen brief pause monitor receiver just before turning tolly isn tgood enough dont get anything else column go hack read last sentence until under stand After weve dealt primary interferences described above still have intermodulation occasionally image problems deal scanning monitor will reveal inter modulation time image conditions right spoke intermodulation image Electronic Bird-Dog column January 1982 p 30 referring contributions AMA Frequency Committee Member Bill Hersch berger printed AMA News January 1981 Briefly intermodulation inter ference occurs signals two differ ent transmitters enter RF section receiver beat against another produce signal third channelwhich happens trying use photo shows Airtronics scanner sent evaluation photo transmitters 7208 Bn/Wh 7224 R/Wh intermodulating produce input 7240 Or/Wh scanner indicates lighting three LEDs two should lit Airtronics scanner shows presence signal four different ways First loudspeaker makes BRRR sound receiving AM RC signal Next row LEDs latch ON receiving sufficiently strong signal strength received signal presented meter Finally attached whip antenna can posi tioned anywhere hemisphere indications alone important Comparison between tham also important photo scanner shows what happens stop scanning affected channel 7240 case hear BRRR see LED lit see signal-strength meter zero able deduce intermodulation inter ference present 7240 relative signal strength very low therefore actual interference should minimal long model airplane 7240 does pass very close intermodulating transmitters reason last statement trans mitters signal strength perceived receiver varies inversely distance between model 7240 far its proper trans mitter passes very close intermodulat ing 7208 7224 transmitters intermodulation result can stronger tended control signal Refer back original articles RT January 1982 issue Bill Hershbergers Togetherness Can Bring Glitches article January 1981 AMA News find rest combinations can may now wondering Just bow far away will scanner pick up transmitter frequency order find out left son Tim bythesideofalong straight flatroad holding Airtronics XLtransmitteras flying gave signal reference taped scanner hood car could keep eye meter driving extended antenna vertically drove away Tim stopping occasionally turn off engine record data table cars odometer gave distance measurements scanner has signal strength meter cali brated linearly 0 8 units unspecified meter dropped less linearly distance value 075 miles Once down toO meter stayed distance increased further row LEDs show frequency being monitored lighting monitoring taking July 198227 Multi Charger b7 e Power Pacer New H S Hornet 2 CID 6 1/3 HP Only 6 1/4 lbs So compact measures much larger Quadra Partner engine Comes complete built-in choke &-bolt prop hub Radial mount twin stack available List $28995 INTRO $19995 Youll Love Partner An updated version popular engine Note improve ments mode especially mini ature aircraft use roller thruse bearing double-ring piston soerk nba location low 13 1/21 power output LiMITED TIME OFFER LIST $14995 SALE $8995 Nrni too piflrw stat cord crate Hatdotr Prop hob MORE HORIJER SPECIALS PART RETAILSALE RADIAL MOUNT Rapa3 797Sj103 RADIAL MOUNTPamaeC123 TWIN STACK EXHAUST 37 & Kierira105 109$9500$2995TWIN STACK EXHAUST Pavaer Oeadro120 1122499518900CHOKE ASSEMBLVPaflearN Onadno121 lOB725009995BRITE SPINNER Raper Pt N Ocad122 1196500NEOPRENE GAS LINE Par Poor107 to25 00RESISTOR SPARK PLUG RCJ-6113 RIG PROPS AVAILABLEi Finiahed aed BaIaread Wood tOt1495 102995 SALE $17995 SALE 12 55 1200 2495 1995 5 00 tvss 95 2 50 Write CALc secRete aPER Super rower Panel QUALITY EQUIPMENT THAT FILLS ALL OF THE ELECTRICAL NEEDS OF YOUR RIC ACCESSORIES L R Taylor & Co 2ntact DeZ oe plaCG strong enough signal detected thG LED latches ON until next scan Latching ceased about 075 miles loudspeaker sounds detected modulation signal volume control adjusts sound level used Radio Shack sound level meter measure output sound level order exclude ambient noise much possible put microphone directly over loudspeaker laying sound level meter top scanner gives rise measurement seems much louder really Ambient noise 100 dB like sound rivet gun scanner isnt really loud found sound level corresponding dis tortion about 102 dB obtained volume-control dial setting 25 dial marked 0 5 equal undefined incre ments Driving away Tim measurement held 102 dB dial setting of25 way out 030 miles necessary start increasing dial setting linearly distance maintain 102 dB level 075 miles volume control 5 distance outward sound level dropped drop seemed follow inverse-square law should until signal lost back ground noise about 19 miles above can deduce scanner picking up Tims transmitter far beyond point could see what holding fact three flying Sites use locally mutually less 15 miles apart crow flies may deduce scanner can reagh out far has order detect other transmitters ground level might affect flying put idea way because weve using fields several years en countering unusual amount unexplained interference fact time has interference far juSt happened no flying other fields frequency being affected 15 miles can occasionally get glimpse light flashing off MonoKote sun right can see another flyingmore less Since rare airplane stray 2000 feet owners transmitter because hard see way going relative signal strength identical transmitter other field never better 6% owners signal Thats like noise interference above measurements have convinced Airtronics scanner useful tool hope convinced too important thing to learn use tool properly Far too folks know will turn transmitters hold within two three antenna lengths monitor complain because several LEDs light up Sure sensitive instrument youre overloading something like want monitor flying field monitor wants 500 1 000 feet away flight line means youll need CB communications theyre pretty common days guy scanner should car CB portable unit pits can provide other end conversation will volunteer monitoring frequency use everybody will benefit no will give up anything opportunity BS little given two-way conversa tion CB dont have give up As might expect Airtronics scanner self-contained portabJe can powered alkaline pencells eight hours Ni-Cds five Con tin ued page 125 28 Model Aviation MIt Anseninac Power Eqoip co Kawasaki Homers Smooth One. 222 CID Sale $17995 315 CID Sale $19499 Comes 6-bolt hub built-in choke Twin stack mount optional Like Quadra Optw.l Oai-tch eer tech oroi omihk Sehcrice aesihhl Oohl-rig pius Ie hi1he coepesois S isgsr lit Optiosti chah Est hood oOrtiru Spsoisl nleo.coplithigheeois orotsa I. ec esitisli. Sslid-hst typs iso op tiosl sdisl spit cell tloot-huri9 eolsoiclt Icr s.i ossdi circuIt Pohslod lisrewcot eh.l 19 ROPER ENGINE CLOSE OUT SALE WHILE THEY LAST 37 SUPER POWER ROPER 22 DUADRA ENGINE 19 ENGINE HUB ft MOUNT PACK 18 USED DEMO ENGINE BALENCED 6-BOLT HUB Ropa Porno, ft Otaedeaj PROP DRILL JIIS love 24 wI optional choke Send 20c Stamp far Catalogiwill Ship Orders Same Oay 1200UPSAud 54 shippiiis per engivr HOR N ER SALES INC Rt 2 Box 9300 Dixie Hwy. 312 946-2515 Beecher IL 60401 THE QUALITY LINETh OF RIC ELECTRONICS vance J*4 5-- 20831 Roscoc Blvd Canoga Park California 91306 213 360-1178 THINK FOX N N Weve Got Support Hardware 2 Vo G ow P ugs Dry Cell Nickel Cad 2 Vo G ow P ugs Lead Acid Battery THE FOX GLOW PLUGS #601061 oentiorral Spinner $1200 #601071 oentional Spinner 1300 #60100 2 Conventional Spinner1400 #601092Conoentonal Spinnei 1500 -#601102 s Co entional Spinner 1600 AlI t FOX POLISHED SPINNERS Offered Three Attractive Styles Conventional Slim Jim / Conical #6020610linrJiinSpnnei$1300 #602071OliieJreopinner 1400 #60206 2 Olin lie Spinner1500 #602092SliiedirnSpinn#r 1600 #602102iOliieJireOpinner 1750 #603061 cal Spinner $t2 00 #603071 Conicat Spinner t3 06 #60300 2 Conical Spinner1400 #603092 cal Spinner 1500 #603102Conca Opener 1600 SPINNER NUTS #60503 03200 neerNoi $200 #60504 1 4 Op cnn Net225 #40101 StandardShort51 beach#doto3Standard Short$1l9nach #40201 Standard Long1 19 each#40203 Standard Long1 19 646502 RiG ShOrt 169 each#40503 RIG ShOrt 169 #40602 PlC Long 1 69 each940603 RIG Long 169 FOX PROP REAMERS Enlarge Prop Shaft Holes larger sizes required can fieldi FOURWAY &FOX ENGINE MOUNTS #OO2lOkErngelehtoant 1506 5 000 TWOWAYRugged Machined Bar Stocke504oiFrirreMoant1217906 #50402 Engine MOont 1 281900 #50403 Engine MoontI 320900 FOX WRENCHESFXEngine Mood1305900 #701012 Wa0 W ench 316 Shall$225501 6 6 656MFG Co#50601 Engine MOunt 14751000 #7OtO22WayW enchi 4 Shalt225#60603 Engine Mount 16401000 #70103 2-Way Wrench 5I16Ohait 0225 5355 Towscn Ace Fort Smith Arkuosas 72901 #50604 Engine Ictoont t 750 1000 #70104 POor Way Wrench795 Reamers & Wrenches Plugs & Mounts & Spinners flying Quarter Scale Aristocrat Fredericks burg last year doubt arose about transmitter batteries Bill Kaluf MEN charger able within 60 seconds conftrm batteries indeed OK 1982 will always year Pac Man gobbled up Ive never trouble batteries before go circles three weeks traumatic almost began scream Give Rubber Power give death Bill Winter 4426 Altura Ct Fairfax VA 22030 Radio Technique/Myers Continued iaqe 28 hours charger plugs cigarette lighter car Doug Pratt has running Airtronics scanner AMA head quarters building downtown DC using Airtronics transmitter charger power theres voltage regulator scanner takes care fact transmitter charger puts out eight cells scanner has four Doug has picked ups variety signals thats OK because no flies RC downtown DC tried same setup house Hicks ville detected nothing Interference find took scanner road found place could hear musical tones sounded bit like pushbutton telephone signals also heard voices time time laid whip antenna parallel ground way us have antennas planes days found strong BRRR signals over flying field no flying also found same signal other places So far havent identified source think its some kind computer data transmission dozens tall towers within sight flying fields sport kinds antennas whips dishes things hidden radomes detect interference have run over scanner stop scan affected channel working AUTO MANUAL switch have compare sound way antenna pointing LEDs meter want learn anything must log time describe whatever have heard After youll build up file channels monitoring now scanner monitors 7208 7216 7224 7232 7240 7296 7564 future Should simple matter monitor others crystal swapping Bandwidth may become slight problem monitoring new frequencies doubt will significant AMA draft Phase-In Plan puts new frequencies 40 KHzapartsee RT April 1982 has demonstrated acceptable existing receiver designs such Airtronics instrument contains Any way look scanning monitor will helpful trying years immediately ahead agree want buy write directly Airtronics 12160 Woodruff Ave. Downey CA 90241 telephone 213 862 6583 may wonder danced neatly away image problems begin image problems rare encounter receiver situated frequency basis midway between two transmitters separated exactly double IF intermediate Cootinued oI page 128 July 1982 125 #70201 FOX 4-step Reamer #70202 FOX KNO Reamer moot purposes$695 icr KER Ohait sioeh 0095 HObbV B0~ habln rprazlniri TIMER KITS tOut1 Partial Kits P & W Oenri-Ruts--Rib Tip Fiurmer Kilo 1941 Playboy Jr 54ii Span 101cc Extra $1456 Plan--$2 50 Gomparuon Strepanod iiKitii~$l3 12 Coabloatian Playboy Jr tall abov# ilnms$2# 00 1641 Playboy Sr #o span Plan Eatrat $1925 Plan-$360 Companion Slpwond Kit $2636 Combination Playboy Sr-tall three itecis $4500 1939 Zipper Comet 54ii Span Plan Inol $3360 Companion Stripanod Kit- $1572 combination Zipper tBotB above iinms--545Ot 1937 flaIls/re Sportster 100 Span Plan EX $2600 Plan--55 09 Companion Stripisood Kit-$35 06 Combination Dallairn Kit oIl three ilemsl-$56 00 1930 Powerhouse #4 Span Plan Extra $3106 Pian--$450 Companion Stripeond Kit- $1776 Combination Poinerhouse Kit tall 3 aboVe $3900 Other cooibinations available-- 1930 Buccanenr$49 00 1936 Clipper 51K 1 $3860 1939 Mercury $5506 1935 Miss Airierica 5s90a 1940 Ranger $2100 1040 Sailplane $7000 1040 So Long $2690 1930 Tendon rerror $3000 Korita Woke $1600 AIIOIOAP MODEL COMPANY Partial Kilo 1936 Plying Quaker #4 Span Plan Inol $2156 Companion Stripwood Kit -$3140 Combinalino Plying Quaker Kit tBolhilems$4#00 1937 Quoker PIrish 07 Span Plan lcd $57St Companion Stripmood Kit--52345 Combination Quaker Plash Kit Both items $3000 1937 Long Cabin 70 Span Plan Extra $1560 Plan- $500 Companion Stripmood Kil-$2456 Combination Lang Cabin Kit tall tbree--$4100 MdOWAY MOOEL COMPANY Poll Rita 0936 Air Trails Sportsler 50 16- 15 H/C $3506 1036 Pomerhouoe 50 Span l0-lh H/C $3596 1940 Buazard Bombshell 30 Span 036 $1195 1940 Playbcy Sr pun 020 engines $129 163$ Miss America 36 Span 020 engines $t2951940 Clipper WRIt 36 Span 020 engines 5t495 1940 New Ruler 31 Span 620 engines $1301 1940 Mercury Scientifics 36 span 020 $1395 1941 Request 30 Span 029 engines $1291 SHIPPING AND HANOLlNG 50 Pa9e CATALOGUE Op 5laa add 9159 St 60 PP IA copy will $601 Ia $2006 add 5225 sent free upon 26Ot 54560 add $300 request witS ordnril $0501 $7010 add $350 y rice aver 57000 add 55 po Boa 306i1 CA Addressees add 60 Tan Seal Beach Ga 93746 Serd 510 VisaAtC 16- EnpI l 7i51 896a223lBest GK COO Eeact COg warnings recarder 50 1-141 IGash Only adtisates S rinqsl Hobbi Shack SUPERMARKET OF HOBBY GOODS SUPER DISCOUNTS PRICES GOOD THRU MAY 82 COXTD049or051 $1747 049 NO 553602 051 NO 553610 HOUSE BALSA 2x2 NO 576377 LIST $2495 1567 DEVCON 5-MINUTE EPOXY NO 566281 LIST $999$576 0-MIDWEST SWEETN LOW NO 569053 LIST $5695. 99 FUTABA SAVINGS FP-4L 3 S26 servos -NO711862eaa LIST $19995 FP-7 FG K jfi with 4 S-26 servos NO 712356 $2499 LIST $39995 9 HUNDREDS MORE SUPER VALUES AND INTERESTING MODEL ARTICLES FREE y Shack customers ceive 32 age SPORT FLYER regularly would like copy simply write us ask FUJI 099 R/C NO 120618 LIST $31 95$1799 PMP THERMAL 73 NO 541492 LIST $2995 788 S HOBBY SHACK HEAT GUN NO 110445 LIST $3295 1499 I0 name address city I statezip U mail order catalogs 18480 BANDILIER CIRCLE 1FOUNTAINVALLEYCA9287081 frequency receiver Jack Albrecht AMA Frequency Committee has taken image problems account making draft Phase-In Plan frequency usage plan followed wont able buy systems suffer image problems leaves 7208/7296 problem familiar will go away five years Till know about careful Some folks already have scanners non-RC bands question bound asked Can use scanner RC answer according John Lange Yes proper converter Once again contact John address call sign given early column precise information need Finally direct attention back cheapest solution could come u ctronic Bird-Dog published Radio Technique January 1982 will monitor channel receiver will monitor very well draws about 300mA order heard above noise engines field wouldnt want leave plugged flight pack very long will completely discharge usual 500 mAh pack less two hours intend con tinuousmonitoring Bird-Dog puta 100ohm resistor series loudspeaker should cut current drain down about 35 mA Keep letters flowing George M Miers 70 Froehlich Farm Rd HieksiiIle NY 11801________ SAFE FLYING IS NO ACCIDENT Neighvion/ Randolph Continued page 35 will find can taxi out spot stop apply power takeoff just would larger plane Dont hurry rotate first flight Apply slight back stick let Neighvion fly off Climb straight out level off trim out original required slight up left trim initial flight Landings quite easy Come back power fly pattern ease off power just before touch-down Smooth time Neighvion smooth solid flier Props Brown lee Con ftnued page 37 l/N As shall see later performance will affected critically pitch long diameter correct let engine develop its maximum power computation purposes value 125 suggested Results obtained using Eq 2 will no better mph value used leads purpose number three starting point equilibrium condition available thrust equals total airframe drag engineering terms Power Out tx velocIty4 Efficiency E r In550 x hp 550 x hp x E thereforeTv4a DCDxOOll9xv2xS5 CD airframe drag coefficient based wing area V velocity feet-per-second S wing area square feet 1 28 Model Aviation GOITIOLINI TEND PROFILE0 COMBA RA T WIDE & NARROW WEDGE 15 -- 6 os Capacities UNIFLOW & TINDD Custom 31il lush Ingredients deraited brochure50C stamps/check CAROLINA TAFFINDER 8345 Delhi Road Charleston Hgts SC 29405 h THE NELSON 15. UN4 VES TION4IL Y THE lEST QUARTER MIDGET AMA C PAl PLUS THE TEXAS 3O complete information Write Kus torn Kraftsmanship Brochure PO Box 2699 Laguna Hills CA 92653 Call f7 14 830-5 162 Dealer inquiries invited IN STOCK FOR IMMEDIATE SHIPMENT NewSUPER QUADRA$9995 wth BRISIGHELLA FLYWHEEL$11995 QUADRA REPAIR51000 plot pent KIORITZ engine 244 c in519995 PUW RADIAL ENGINES FleerS2295 Jorr M ester ERCOUPEPLANS S2395 KIT S22995 Jier M TOMAHAWKPLANS $2395 KIT S245 95 BALSA BASSWOOD oil sicen35% OFF Concept FLEETKIT 517995 F 0 CoW $1995 QUADRA foel tonkO16 0 5695 32 oe S795 VICKERSor LEWIS MACHINE GUN KITS51499 10 RED WHEELS USA Pop$2595 PLANS SUPER STEARMAN reyS250O STARDUSTER TOO ghelleS29 95 scale J-3 CUB Nelde$2995 VDLKSPLANE ken ChorIreS2395 FLY BABY $1696 56-5 ch524RR COCKPIT KITS Tocehewk F4U-1 SprtfrreS21 95 Ercoope $1795 Steerroen 52G 95 Creebrie $2495 I-3 Cob 51950 ME-lOS $21 50 Fleet $1995 FIBERGLASS ARROW SHAFTS 5/16 032 1g6/51000 24-Hour Service. Add $250 postage Send Bank Check Money Order JIM MESSERS QUALITY MODEL PRODUCTS 106 Valley View Dr Allegany NY 14706
Edition: Model Aviation - 1982/07
Page Numbers: 26, 27, 28, 125, 128
Radio Techniq George M Myers ue NEW FREQUENCIES OLD FREQUEN CIES AND SCANNERS As write seems pretty likely will have new fre quencies available 1983 season brings up two thoughts Frequency Monitoring Frequency Control Frequency Monitoring means listening what going RC channel propose use before turn transmitter Frequency Control means making some kind provision assure no else tries use same channel using World Engines put scanning monitor market some time ago didnt sell particularly well bought didnt use much reason using scanner cant hear above noise engine also lot carping about fact order get away local effects related strength signal trans mitters flight line monitor located reasonable distance away meant couldnt fly monitor too Finally scanning monitor idea suffered fact monitor receiver working ground level short antenna simply couldnt hear same interference plane could several hundred feet above field com plaints really valid Well see moment First what about future see two problem areas Continued use seven existing evennumbered 72-76 MHz frequencies face ever-increasing interference during 5-year grandfather period would expect such users would find scanner become virtually necessity just make flying possible 2 Beginning use large number oddnumbered 7 2-76 MHz frequencies face certain interference some ofthem justification giving us first place scanner will tell channels avoid particular part world should guide purchasing deci sions What kinds interference likely en counter Obviously interference another modeler same channel number problem clothespin idea has proven work everyone follows religiously trouble everyone does rye seen dozens good ideas presented purpose frequency control break down some independent jerk wont play rules Theres always guy atthe field wont put clip antenna fear scratching insists can run up engine make control adjustments transmitter antenna collapsed wont hurt anybody dont have problems youve got contend guy forgets Scanner duty Its showing intermodulation 72400 two transmitters operating 72240 72080 simultaneously Note signal strength meter indicates intermodulation signal very weak 26 Model Aviation looks frequency flag misinterprets color theres problem trans mitter thats left ON Somebody always gets hurt Proper use scanner could eliminate some problems Next interference list would inter ference some commercial user Mr John R Lange 1700 North 37th Ave Stone Park IL 60165 has telling experience monitoring interference over year John manufacturer three kits converters described Receiving Converters RC Fre quencies Model Aviation February 1982 p 36 letters continuously update informa tion gaining sitting quietly listening . car radio hooked up converters driving Ham receiver home Johns call K9ARA Hams out might want give him shout see what latest findings John finding lot activity bands interesting part activity inter mittent somewhat randomly-spaced time As far monitor concerned have sit listen long time before can have confidence know what likely happen brief pause monitor receiver just before turning tolly isn tgood enough dont get anything else column go hack read last sentence until under stand After weve dealt primary interferences described above still have intermodulation occasionally image problems deal scanning monitor will reveal inter modulation time image conditions right spoke intermodulation image Electronic Bird-Dog column January 1982 p 30 referring contributions AMA Frequency Committee Member Bill Hersch berger printed AMA News January 1981 Briefly intermodulation inter ference occurs signals two differ ent transmitters enter RF section receiver beat against another produce signal third channelwhich happens trying use photo shows Airtronics scanner sent evaluation photo transmitters 7208 Bn/Wh 7224 R/Wh intermodulating produce input 7240 Or/Wh scanner indicates lighting three LEDs two should lit Airtronics scanner shows presence signal four different ways First loudspeaker makes BRRR sound receiving AM RC signal Next row LEDs latch ON receiving sufficiently strong signal strength received signal presented meter Finally attached whip antenna can posi tioned anywhere hemisphere indications alone important Comparison between tham also important photo scanner shows what happens stop scanning affected channel 7240 case hear BRRR see LED lit see signal-strength meter zero able deduce intermodulation inter ference present 7240 relative signal strength very low therefore actual interference should minimal long model airplane 7240 does pass very close intermodulating transmitters reason last statement trans mitters signal strength perceived receiver varies inversely distance between model 7240 far its proper trans mitter passes very close intermodulat ing 7208 7224 transmitters intermodulation result can stronger tended control signal Refer back original articles RT January 1982 issue Bill Hershbergers Togetherness Can Bring Glitches article January 1981 AMA News find rest combinations can may now wondering Just bow far away will scanner pick up transmitter frequency order find out left son Tim bythesideofalong straight flatroad holding Airtronics XLtransmitteras flying gave signal reference taped scanner hood car could keep eye meter driving extended antenna vertically drove away Tim stopping occasionally turn off engine record data table cars odometer gave distance measurements scanner has signal strength meter cali brated linearly 0 8 units unspecified meter dropped less linearly distance value 075 miles Once down toO meter stayed distance increased further row LEDs show frequency being monitored lighting monitoring taking July 198227 Multi Charger b7 e Power Pacer New H S Hornet 2 CID 6 1/3 HP Only 6 1/4 lbs So compact measures much larger Quadra Partner engine Comes complete built-in choke &-bolt prop hub Radial mount twin stack available List $28995 INTRO $19995 Youll Love Partner An updated version popular engine Note improve ments mode especially mini ature aircraft use roller thruse bearing double-ring piston soerk nba location low 13 1/21 power output LiMITED TIME OFFER LIST $14995 SALE $8995 Nrni too piflrw stat cord crate Hatdotr Prop hob MORE HORIJER SPECIALS PART RETAILSALE RADIAL MOUNT Rapa3 797Sj103 RADIAL MOUNTPamaeC123 TWIN STACK EXHAUST 37 & Kierira105 109$9500$2995TWIN STACK EXHAUST Pavaer Oeadro120 1122499518900CHOKE ASSEMBLVPaflearN Onadno121 lOB725009995BRITE SPINNER Raper Pt N Ocad122 1196500NEOPRENE GAS LINE Par Poor107 to25 00RESISTOR SPARK PLUG RCJ-6113 RIG PROPS AVAILABLEi Finiahed aed BaIaread Wood tOt1495 102995 SALE $17995 SALE 12 55 1200 2495 1995 5 00 tvss 95 2 50 Write CALc secRete aPER Super rower Panel QUALITY EQUIPMENT THAT FILLS ALL OF THE ELECTRICAL NEEDS OF YOUR RIC ACCESSORIES L R Taylor & Co 2ntact DeZ oe plaCG strong enough signal detected thG LED latches ON until next scan Latching ceased about 075 miles loudspeaker sounds detected modulation signal volume control adjusts sound level used Radio Shack sound level meter measure output sound level order exclude ambient noise much possible put microphone directly over loudspeaker laying sound level meter top scanner gives rise measurement seems much louder really Ambient noise 100 dB like sound rivet gun scanner isnt really loud found sound level corresponding dis tortion about 102 dB obtained volume-control dial setting 25 dial marked 0 5 equal undefined incre ments Driving away Tim measurement held 102 dB dial setting of25 way out 030 miles necessary start increasing dial setting linearly distance maintain 102 dB level 075 miles volume control 5 distance outward sound level dropped drop seemed follow inverse-square law should until signal lost back ground noise about 19 miles above can deduce scanner picking up Tims transmitter far beyond point could see what holding fact three flying Sites use locally mutually less 15 miles apart crow flies may deduce scanner can reagh out far has order detect other transmitters ground level might affect flying put idea way because weve using fields several years en countering unusual amount unexplained interference fact time has interference far juSt happened no flying other fields frequency being affected 15 miles can occasionally get glimpse light flashing off MonoKote sun right can see another flyingmore less Since rare airplane stray 2000 feet owners transmitter because hard see way going relative signal strength identical transmitter other field never better 6% owners signal Thats like noise interference above measurements have convinced Airtronics scanner useful tool hope convinced too important thing to learn use tool properly Far too folks know will turn transmitters hold within two three antenna lengths monitor complain because several LEDs light up Sure sensitive instrument youre overloading something like want monitor flying field monitor wants 500 1 000 feet away flight line means youll need CB communications theyre pretty common days guy scanner should car CB portable unit pits can provide other end conversation will volunteer monitoring frequency use everybody will benefit no will give up anything opportunity BS little given two-way conversa tion CB dont have give up As might expect Airtronics scanner self-contained portabJe can powered alkaline pencells eight hours Ni-Cds five Con tin ued page 125 28 Model Aviation MIt Anseninac Power Eqoip co Kawasaki Homers Smooth One. 222 CID Sale $17995 315 CID Sale $19499 Comes 6-bolt hub built-in choke Twin stack mount optional Like Quadra Optw.l Oai-tch eer tech oroi omihk Sehcrice aesihhl Oohl-rig pius Ie hi1he coepesois S isgsr lit Optiosti chah Est hood oOrtiru Spsoisl nleo.coplithigheeois orotsa I. ec esitisli. Sslid-hst typs iso op tiosl sdisl spit cell tloot-huri9 eolsoiclt Icr s.i ossdi circuIt Pohslod lisrewcot eh.l 19 ROPER ENGINE CLOSE OUT SALE WHILE THEY LAST 37 SUPER POWER ROPER 22 DUADRA ENGINE 19 ENGINE HUB ft MOUNT PACK 18 USED DEMO ENGINE BALENCED 6-BOLT HUB Ropa Porno, ft Otaedeaj PROP DRILL JIIS love 24 wI optional choke Send 20c Stamp far Catalogiwill Ship Orders Same Oay 1200UPSAud 54 shippiiis per engivr HOR N ER SALES INC Rt 2 Box 9300 Dixie Hwy. 312 946-2515 Beecher IL 60401 THE QUALITY LINETh OF RIC ELECTRONICS vance J*4 5-- 20831 Roscoc Blvd Canoga Park California 91306 213 360-1178 THINK FOX N N Weve Got Support Hardware 2 Vo G ow P ugs Dry Cell Nickel Cad 2 Vo G ow P ugs Lead Acid Battery THE FOX GLOW PLUGS #601061 oentiorral Spinner $1200 #601071 oentional Spinner 1300 #60100 2 Conventional Spinner1400 #601092Conoentonal Spinnei 1500 -#601102 s Co entional Spinner 1600 AlI t FOX POLISHED SPINNERS Offered Three Attractive Styles Conventional Slim Jim / Conical #6020610linrJiinSpnnei$1300 #602071OliieJreopinner 1400 #60206 2 Olin lie Spinner1500 #602092SliiedirnSpinn#r 1600 #602102iOliieJireOpinner 1750 #603061 cal Spinner $t2 00 #603071 Conicat Spinner t3 06 #60300 2 Conical Spinner1400 #603092 cal Spinner 1500 #603102Conca Opener 1600 SPINNER NUTS #60503 03200 neerNoi $200 #60504 1 4 Op cnn Net225 #40101 StandardShort51 beach#doto3Standard Short$1l9nach #40201 Standard Long1 19 each#40203 Standard Long1 19 646502 RiG ShOrt 169 each#40503 RIG ShOrt 169 #40602 PlC Long 1 69 each940603 RIG Long 169 FOX PROP REAMERS Enlarge Prop Shaft Holes larger sizes required can fieldi FOURWAY &FOX ENGINE MOUNTS #OO2lOkErngelehtoant 1506 5 000 TWOWAYRugged Machined Bar Stocke504oiFrirreMoant1217906 #50402 Engine MOont 1 281900 #50403 Engine MoontI 320900 FOX WRENCHESFXEngine Mood1305900 #701012 Wa0 W ench 316 Shall$225501 6 6 656MFG Co#50601 Engine MOunt 14751000 #7OtO22WayW enchi 4 Shalt225#60603 Engine Mount 16401000 #70103 2-Way Wrench 5I16Ohait 0225 5355 Towscn Ace Fort Smith Arkuosas 72901 #50604 Engine Ictoont t 750 1000 #70104 POor Way Wrench795 Reamers & Wrenches Plugs & Mounts & Spinners flying Quarter Scale Aristocrat Fredericks burg last year doubt arose about transmitter batteries Bill Kaluf MEN charger able within 60 seconds conftrm batteries indeed OK 1982 will always year Pac Man gobbled up Ive never trouble batteries before go circles three weeks traumatic almost began scream Give Rubber Power give death Bill Winter 4426 Altura Ct Fairfax VA 22030 Radio Technique/Myers Continued iaqe 28 hours charger plugs cigarette lighter car Doug Pratt has running Airtronics scanner AMA head quarters building downtown DC using Airtronics transmitter charger power theres voltage regulator scanner takes care fact transmitter charger puts out eight cells scanner has four Doug has picked ups variety signals thats OK because no flies RC downtown DC tried same setup house Hicks ville detected nothing Interference find took scanner road found place could hear musical tones sounded bit like pushbutton telephone signals also heard voices time time laid whip antenna parallel ground way us have antennas planes days found strong BRRR signals over flying field no flying also found same signal other places So far havent identified source think its some kind computer data transmission dozens tall towers within sight flying fields sport kinds antennas whips dishes things hidden radomes detect interference have run over scanner stop scan affected channel working AUTO MANUAL switch have compare sound way antenna pointing LEDs meter want learn anything must log time describe whatever have heard After youll build up file channels monitoring now scanner monitors 7208 7216 7224 7232 7240 7296 7564 future Should simple matter monitor others crystal swapping Bandwidth may become slight problem monitoring new frequencies doubt will significant AMA draft Phase-In Plan puts new frequencies 40 KHzapartsee RT April 1982 has demonstrated acceptable existing receiver designs such Airtronics instrument contains Any way look scanning monitor will helpful trying years immediately ahead agree want buy write directly Airtronics 12160 Woodruff Ave. Downey CA 90241 telephone 213 862 6583 may wonder danced neatly away image problems begin image problems rare encounter receiver situated frequency basis midway between two transmitters separated exactly double IF intermediate Cootinued oI page 128 July 1982 125 #70201 FOX 4-step Reamer #70202 FOX KNO Reamer moot purposes$695 icr KER Ohait sioeh 0095 HObbV B0~ habln rprazlniri TIMER KITS tOut1 Partial Kits P & W Oenri-Ruts--Rib Tip Fiurmer Kilo 1941 Playboy Jr 54ii Span 101cc Extra $1456 Plan--$2 50 Gomparuon Strepanod iiKitii~$l3 12 Coabloatian Playboy Jr tall abov# ilnms$2# 00 1641 Playboy Sr #o span Plan Eatrat $1925 Plan-$360 Companion Slpwond Kit $2636 Combination Playboy Sr-tall three itecis $4500 1939 Zipper Comet 54ii Span Plan Inol $3360 Companion Stripanod Kit- $1572 combination Zipper tBotB above iinms--545Ot 1937 flaIls/re Sportster 100 Span Plan EX $2600 Plan--55 09 Companion Stripisood Kit-$35 06 Combination Dallairn Kit oIl three ilemsl-$56 00 1930 Powerhouse #4 Span Plan Extra $3106 Pian--$450 Companion Stripeond Kit- $1776 Combination Poinerhouse Kit tall 3 aboVe $3900 Other cooibinations available-- 1930 Buccanenr$49 00 1936 Clipper 51K 1 $3860 1939 Mercury $5506 1935 Miss Airierica 5s90a 1940 Ranger $2100 1040 Sailplane $7000 1040 So Long $2690 1930 Tendon rerror $3000 Korita Woke $1600 AIIOIOAP MODEL COMPANY Partial Kilo 1936 Plying Quaker #4 Span Plan Inol $2156 Companion Stripwood Kit -$3140 Combinalino Plying Quaker Kit tBolhilems$4#00 1937 Quoker PIrish 07 Span Plan lcd $57St Companion Stripmood Kit--52345 Combination Quaker Plash Kit Both items $3000 1937 Long Cabin 70 Span Plan Extra $1560 Plan- $500 Companion Stripmood Kil-$2456 Combination Lang Cabin Kit tall tbree--$4100 MdOWAY MOOEL COMPANY Poll Rita 0936 Air Trails Sportsler 50 16- 15 H/C $3506 1036 Pomerhouoe 50 Span l0-lh H/C $3596 1940 Buazard Bombshell 30 Span 036 $1195 1940 Playbcy Sr pun 020 engines $129 163$ Miss America 36 Span 020 engines $t2951940 Clipper WRIt 36 Span 020 engines 5t495 1940 New Ruler 31 Span 620 engines $1301 1940 Mercury Scientifics 36 span 020 $1395 1941 Request 30 Span 029 engines $1291 SHIPPING AND HANOLlNG 50 Pa9e CATALOGUE Op 5laa add 9159 St 60 PP IA copy will $601 Ia $2006 add 5225 sent free upon 26Ot 54560 add $300 request witS ordnril $0501 $7010 add $350 y rice aver 57000 add 55 po Boa 306i1 CA Addressees add 60 Tan Seal Beach Ga 93746 Serd 510 VisaAtC 16- EnpI l 7i51 896a223lBest GK COO Eeact COg warnings recarder 50 1-141 IGash Only adtisates S rinqsl Hobbi Shack SUPERMARKET OF HOBBY GOODS SUPER DISCOUNTS PRICES GOOD THRU MAY 82 COXTD049or051 $1747 049 NO 553602 051 NO 553610 HOUSE BALSA 2x2 NO 576377 LIST $2495 1567 DEVCON 5-MINUTE EPOXY NO 566281 LIST $999$576 0-MIDWEST SWEETN LOW NO 569053 LIST $5695. 99 FUTABA SAVINGS FP-4L 3 S26 servos -NO711862eaa LIST $19995 FP-7 FG K jfi with 4 S-26 servos NO 712356 $2499 LIST $39995 9 HUNDREDS MORE SUPER VALUES AND INTERESTING MODEL ARTICLES FREE y Shack customers ceive 32 age SPORT FLYER regularly would like copy simply write us ask FUJI 099 R/C NO 120618 LIST $31 95$1799 PMP THERMAL 73 NO 541492 LIST $2995 788 S HOBBY SHACK HEAT GUN NO 110445 LIST $3295 1499 I0 name address city I statezip U mail order catalogs 18480 BANDILIER CIRCLE 1FOUNTAINVALLEYCA9287081 frequency receiver Jack Albrecht AMA Frequency Committee has taken image problems account making draft Phase-In Plan frequency usage plan followed wont able buy systems suffer image problems leaves 7208/7296 problem familiar will go away five years Till know about careful Some folks already have scanners non-RC bands question bound asked Can use scanner RC answer according John Lange Yes proper converter Once again contact John address call sign given early column precise information need Finally direct attention back cheapest solution could come u ctronic Bird-Dog published Radio Technique January 1982 will monitor channel receiver will monitor very well draws about 300mA order heard above noise engines field wouldnt want leave plugged flight pack very long will completely discharge usual 500 mAh pack less two hours intend con tinuousmonitoring Bird-Dog puta 100ohm resistor series loudspeaker should cut current drain down about 35 mA Keep letters flowing George M Miers 70 Froehlich Farm Rd HieksiiIle NY 11801________ SAFE FLYING IS NO ACCIDENT Neighvion/ Randolph Continued page 35 will find can taxi out spot stop apply power takeoff just would larger plane Dont hurry rotate first flight Apply slight back stick let Neighvion fly off Climb straight out level off trim out original required slight up left trim initial flight Landings quite easy Come back power fly pattern ease off power just before touch-down Smooth time Neighvion smooth solid flier Props Brown lee Con ftnued page 37 l/N As shall see later performance will affected critically pitch long diameter correct let engine develop its maximum power computation purposes value 125 suggested Results obtained using Eq 2 will no better mph value used leads purpose number three starting point equilibrium condition available thrust equals total airframe drag engineering terms Power Out tx velocIty4 Efficiency E r In550 x hp 550 x hp x E thereforeTv4a DCDxOOll9xv2xS5 CD airframe drag coefficient based wing area V velocity feet-per-second S wing area square feet 1 28 Model Aviation GOITIOLINI TEND PROFILE0 COMBA RA T WIDE & NARROW WEDGE 15 -- 6 os Capacities UNIFLOW & TINDD Custom 31il lush Ingredients deraited brochure50C stamps/check CAROLINA TAFFINDER 8345 Delhi Road Charleston Hgts SC 29405 h THE NELSON 15. UN4 VES TION4IL Y THE lEST QUARTER MIDGET AMA C PAl PLUS THE TEXAS 3O complete information Write Kus torn Kraftsmanship Brochure PO Box 2699 Laguna Hills CA 92653 Call f7 14 830-5 162 Dealer inquiries invited IN STOCK FOR IMMEDIATE SHIPMENT NewSUPER QUADRA$9995 wth BRISIGHELLA FLYWHEEL$11995 QUADRA REPAIR51000 plot pent KIORITZ engine 244 c in519995 PUW RADIAL ENGINES FleerS2295 Jorr M ester ERCOUPEPLANS S2395 KIT S22995 Jier M TOMAHAWKPLANS $2395 KIT S245 95 BALSA BASSWOOD oil sicen35% OFF Concept FLEETKIT 517995 F 0 CoW $1995 QUADRA foel tonkO16 0 5695 32 oe S795 VICKERSor LEWIS MACHINE GUN KITS51499 10 RED WHEELS USA Pop$2595 PLANS SUPER STEARMAN reyS250O STARDUSTER TOO ghelleS29 95 scale J-3 CUB Nelde$2995 VDLKSPLANE ken ChorIreS2395 FLY BABY $1696 56-5 ch524RR COCKPIT KITS Tocehewk F4U-1 SprtfrreS21 95 Ercoope $1795 Steerroen 52G 95 Creebrie $2495 I-3 Cob 51950 ME-lOS $21 50 Fleet $1995 FIBERGLASS ARROW SHAFTS 5/16 032 1g6/51000 24-Hour Service. Add $250 postage Send Bank Check Money Order JIM MESSERS QUALITY MODEL PRODUCTS 106 Valley View Dr Allegany NY 14706