I Kopski wrap-up author talks about mail received past months gives look future Electric flying covers some over sights omissions previous partsand Part 10conclu sion its really beginning CONCLUSION misnomer word does describe final part series series hardly last word Electrics means about Electrics quite accurate title either can blame editor However hope purpose has fulfilledto share enough expe riences assure first time con tinuing success Electrics under standing installment will attempt review high points series catch up some loose ends respond some mostoften-raised points mail Ive re ceived written Part 7 March issue just appeared obviously has yet no reader feedback Parts 8 9 Review series has appeared con tinuously since September 1983 issue covering everything what Electric to accomplish own flight objec tives Part 1 back September 1983 sales pitch sorts case youve forgotten what Electric good can dig out issue reminder youre still reading series Since Electric new folks general lack familiarity electric motors Part 2 delved sub ject intended help everyone feel ease new prop turners rest series followed introductions out way Part 3 really got series going November 1983 issue relation ship electrical power motors propellers demonstrated saw motors discussed rather similar performance particular saw much difference electri cal input power required turn given prop specific rpm among variety un named motors beyond im portantly saw very dramatic effect propeller size power drain batterythe Electric models fuel tank lessons important planning own Electric undertaking Part 4 got heavily mostoften-misunderstood areas battery part surveyed battery size what means saw size battery weight amount available power related Much said about charging common methods describedincluding favorite conservative charge very safe con78 Model Aviation Left Tracy Keneagy helps show off Ellis Grumers Astro Porterfield model weighs 80 oz wing loading 168 ozIsq ft Power Astro 15 belt drive reducer swings 13-8 wood prop Energy storage 16 cells 55 Ah capacity Author says Porterfield has seen flies very well Right Tom Greets Gentle Lady gets off another flight typically 12 15-mm range weighs 41 oz powered Leisure LT-50 motor 31 gearing swing 9-5 prop Energy provided six 12 Ah Ni-Cd cells venient technique Finally some sugges tions concerning battery installation pre cautions cooling offered So ended 1983 new year brought Parts 5 6 January February issues subject installations requiring two issues cover Looking back topic prob ably out placethe result seemingly continuing extension series proper foresight needed get things right place subject might have better placed after covering what make installation Anyway Parts 5 6 looked motor mounting battery mount ing radio mounting parameter extreme importance successful Electric flying introduced weight Other sub jects basic importance covered switches connectors fuses wiring speed controls prop stops etc Having just covered lot how-to stuff probably found going lighter March issue Part 7 showed graphically what kind flight performance could expected four typical Electric appli cations four models described great detail Data hundreds flights offered pictorial proof Electrics can fly very well indeed saw 5 mm stay stick aerobatics 15 mm Old-Timer laziness routinely possible Part 7 favorite stands solid data base cant argued April MA brought Part 8s shower suggestions sound Electric planning construction first time very grave importance weight quan titatively depicted rules thumb what meant Since its easy come up flimsy lightweight construction sug gestions building strong lightweight models offered Both relative scar city suitable kits growing number magazine plans Electrics noted entire series rapidly came together Part 9 Included extensive tabu lation large variety motor prop battery combinationsand associated operating power levels part taken earlier installments key let know ahead time what would fly well True nowhere cookbook what Electric stuff goes what plane reason no plot flying weight electrical input power static number Electrics author has built flown over years various models wide variation wing loading shown four ranges compare examples guidelines given throughout series will see used least twice cruise power level Several hotter ships much power indicated estimated average power during battery run-down peak burst just after charging Shown also approxi mate motor size ranges most-used motors falling 05 075 range Use graph and/or previous rules thumb relate power systems tabulated Part 9 kind model performance would like obtain Thousands flights went makeup graph models part flew just great Some very same models described much detail earlier series June 1984 79 Another Carl Goldberg Gentle Lady electrified Keith Grote Keith uses Mabuchi 550 SP motor eight Mabuchi AC cells 7-6 prop 44 oz 12-mm flights typical 300 MOTOR POWER INPUT & WEIGHT OF VARIOUS PERSONAL ELECTRICS PARAMETER IS WING LOADING IN OZ/SQFTV PARAMETER LEGEND 2508012____ ____ 2 15 15 18 200-18 v22_____ 4N iso _Ok xIS -A 0 o4 100- 075 A05 U 0 50035 02 0 0 0 10 20 30 40 50 60 70 80 90 100 MODEL WEIGHT ombination can guaranteed cause can easily make anything fly allowing model become unreason ably heavy Better cookbook however virtually unlimited number possible planes just waiting culled out tabulations earlier rules thumb have some simple arithmeticjust like example shown reasonably good building job rest piece cake resulting model should great flier examples Some may still feeling uncertain previous stallments should help assure Electric success key piece information may still obscure much plane self will weigh Part 7 detailed sev eral planes component weights doesnt cover possibilities Actu ally may never have paid much atten tion own building techniques corresponding weights prob ably dont have experienced feel examples Part 7 should help see what planes various sizes can made weigh fly Perhaps chosen design will fall close enough size examples can check construction suggestions Part 8 study various magazine plans other Electrics built and/or drop line see variable can control model weight because almost entirely dependent construc tion materials use Weights motor radio components relatively fixed Thus degree success satisfaction often depend entirely light though durable able make plane fact will go far say almost suitable design power system combination will fly well 4/you dont build model too heavy previously noted kits de signed glow engines Sailplanes suited Electric because struc tural weight kit designs okay structural modifications Some exam ples pictured models flown past KRC Electric Fly events good performers However dont know what particular modifications corporated main point planes can made successful Electrics youre faced impossible Again think light strong Study de sign examples Part 9 apply whats offered throughout series Electric Elation yours mailbag random order So far have received approximately 150 letters maximum mail flow letter day about five weeks late 1983 responded except few required no answerthose writer merely fered commentalways favorable Actu ally few didnt answer because some other rather important notes collectively disap peared day never found 80 Model Aviation think yours might have please write againand forgive same time Some readers wrote once particular wrote seven times Some didnt write called instead most-often-asked question What motor should use such such plane specific question tried give specific answer ingredient common range answers advice weight Please dont impatient saying over over being overweight can kill youand Electric success aswell planes fly great personally could lot lighter Another often-asked question concerns variable-speed controls gliders Its personal preference otherwise com mon choice use variable throttle glider seems people just want get plane up face real challengeto glide long time Nonetheless feel youd enjoy Electric flying speed control glider means Personally like variable-speed control Scale plan use new sport machine designed compete against glow engine planes club fun-fly events number readers took umbrage Part 3 wherein performance several unnamed motors graphed think folks missed point being made motors very similar measured differences fairly small presenta tion fact intended show its mostly prop motor deter mines power input Neither Part 3 nor other part ever intended Elec tric consumers report So far know arent bad motors used graphic presentation has also used own planes Further cases sample given motor type characterized evaluated-surely insufficient evidence form judgment against product Also Part 3 some folks clearly mis understood some basic prop/battery power relationships Others clearly caught up board Some latter sent additional graphs equa tions Two mamrfacturers quired about data give promised fairly large number letters came folks active modelers years past drifted out hobby Now have renewed interest because Electrics Some readers took time tell what flying let tell variety out designs original kit conversion frequently mentioned Its Drifter Two Power always something 05 075 range received few phone calls want mention two two highly experienced highly regarded Electric fliersJim Zarembski RCM columnist Keith Shaw impressive Electric flier Ive ever seen Continued page 82 Olympic Two built Brian Bailie mew has brother John weighs 5Y2 lb powered pod-mounted Astro 25 16 12 Ah cells carried pods beneath wing Uses 9-6 propeller Wing loading comes about 136 ozisq ft 10-mm flights typical Unarles Hampton tiles Airtronics Olympic 650 Mabuchi 550 motor 8-4 prop eight cells size unknown An excellent flier photos month Herb Dirks Incorporated 322 So Gallatin RdMadison TN 37115 615 868-6811 Mon thru Sat am 500 pm - FUTABA RADIO SALE Because care radio systems prechecked f REPAIR SERVICE FOR proper operation prior shipment HOBBY LOBBYFP-7GK 72FMS125 ist535995$24150 E K LOG CT RO LFP-7GK 72AM5-28Iist$35995$22500 FUTABA FTFP-5GK 72FMS-12a Iist$31995$20100 FP-5GK 72AM5-25Iist$28995sisi 50 HOBBY SHACKFP-4LW/3 S-28servosIist$19995$11500 ROYAL LINEAdd $295 Prepaid Mastercard Visa COD $495Tenn residents add 675% tax 82 Model Aviation Jim Keith both picked up po tential trouble spot Part 5 part illustrated preferred battery installation cooling technique cooling air enters above battery flows through cells exits via holes floor fuselage reported stances depending shape fuselage flight characteristics etc peculiar air pressure imbalance can develop prevent airflow out fuselage bottom solution put reverse airscoop forward air exit holes resulting step cures adverse pressure buildup fuselage bottom may explain Ive battery heating problems 1-3 However trying retain scalelike appearance made air intakes rather small Perhaps heating problem resulted com bination both things know cooling method described works very well other planes far scheme Ive used Id like expand Whenever put new model use very carefully check battery motor heat following first several flightsjust make dam sure no gotchas Further after flights some planes often physical evidence good air flow through battery What could Brush dust Several high-powerspending models also spend brushes resulting dust pictured earlier series stuff follows cooling air stream gets deposited anything paththe battery cells right through air exit holes isnt much brush dust 1-3 its hard brushes Im going try suggestion Thanks Jim Keith Some readers reported being interested series cut out articles kept separately Its too bad maga zine articles have spread out over pages thats has Based reader inputs popular Electrics gliders second-mostmentioned type Old-Timers hope thats because folks think nothing else can successfully done Dont forget Scale Aerobatics Pylon Racing great catch-all sport flying Nobody wrote anything about contest terests clearly supports whats lemed Keystone RC Club Electric Fly events far people just want get something flying electric powered pursue simple fun figure sooner later satisfaction success become routine fun will begin mean com petition number comments received la menting seemingly short supply basic Electric information thus endearing series readers default also took note widespread lack dealer interest knowledge Elec trics Several readers requested additional assorted topics covered series Continued page 171 LLL 13311 Beach Ave na Del Rey 1S 1-6242 SALESI RADIO SYSTEMS FUTABA ROYAL ACCESSORIES FOR MOST RADIOSI trics/Kopski Continued page 82 example reader wanted coverage air foils Electrics Others requested series made book Still others wrote wanting buy some models pictured Its very difficult cover everything dont know what means far airfoils go good airfoil glow engine plane its almost certainly good wing section Electric assuming plane also appropriate book has discussedthe outcome certain dont have planes sale does occur theres usually someone whos waiting Some readers asked about suppliers Electric goodies could develop list always chance Id inadvertently miss someone Id want have explain away Besides can al ways thumb through maga zines check ads Catalogs price lists available suppliers usually nominal handling mailing fee Its few cents well spent memorable letter came 14-year-old Tracy Reno wanted know about electric-powered ducted fans Personally have no relevant experience could tell what hoped likely successful truly regret having let down Its likely Ill forget Very sorry Tracy new product Part 4 batteries described two commonly used cell capacities 055 Ah 12 Ah noted latter larger cell size rapidly growing popu larity Since writing new cell size has become available Its 08 Ah capacity available both Astro Leisure have seven-cell battery its weight 9 oz can see individual cells about 13 oz Now lets some arithmetic have stated cell ca pacity weight closely related cells should weigh about 08/12 times weight 12 Ah cell larger cells weigh about 2 oz Both Sanyo Guess what 08/12 x 2 Hows being close Remember theres no magic cant get something nothing havent chance use new pack yet plan Remember south eastern Pennsylvania has four-season year dead winter written should view size option component ever-increasing number Electric parts supplies more stuff use more opportunity Electric flying choices success satisfaction SEAM Society Electric Air craft Modelers new fairly recent founding What really new about SEAM its recent recognition AMA Special Interest Group action places SEAM very important position guiding force matters Electricincluding such things competition rules team selec tion records safety etc Such AMA recog nition assumes SEAM unified voice interested Electrics youve come far series youre clearly interested Electrics go step further drop line Society Electric Aircraft Modelers 11632 Flamingo Dr Garden Grove CA 92644 Ask latest info application member ship Ten bucks adds name grow ing voice gets regular newsletter way SEAM organized district like AMA district has SEAM director Im director District 3 future What likely future Electrics will growth popularity feel sure pretty safe conclusion part no other reason fact Electrics quietand coming more necessary more places course Electrics also convenient quite workable applicable very wide range modeling interests etc Most kind flying fun future also will see introduction refinement Electric classes orga nized competition wonder readers remember knew June 1984 171 4 CYCLE POWEHeu au wINGSPAN SEND $100 FOR COMPLETE CATALOG OF FINE KITS RIC SCALE PLANS Curtlss Hawk P4-E 60 gee 55W eq I. plum$3495 Aeroacs Model K-1937 51 gee $1995 Pipe Super Cub CnaIer PA-Il 51 gem. $1995 PIperPscerPA-2e 59 ge V kde$2995 Piper TiE-Pacer PA-Il 89 gem Scale$2995 DH-5LeopardMoth111s1eaAkuh$1995 DH-80APussMoth111gee.AScd$1995 Sphmks Akroanaster 60 gem 1/5 Seal$1495 Send Self-Addressed Stamped Envelope Complete List HOBBY CAPITOL RIC 46 N Oak St. Ventura CA 93001 Ikon NWST PO Box 566 Auburn WA 98071 206 941-8248 HIgh tensile aluminum alloy Preclslon machIned polished Hardened socket cap screws Included DRILLED AND TAPPED FOR No 31658 ENYA 35-40895 No 31984 ENVA 601295 No 31995 ENYA 901296 No 31452 HP VT 21750 No 31644 HP VT 49896 No 31654 MAX FS 40896 No 31964 MAX FS 60-75-901295 No 32175 MAX FS 1201996 No 31463 SAITO FA 30750 No 31474 SAITO FA 40-45896 No 32196 SAITO FA 1201996 AT MOST HOBBY SHOPS OR ORDER DIRECT Send 100 12 page illustrated catalog L Consumers Guide RC Aircraft Products 242 Pages Hundreds New Products Photos & Descriptions over 2000 RC Aircraft Products fered 176 companies Outstanding Value Only $495 plus shipping* Send $660 Includes UPS ft handling Foreign ordars send $786 US surface mail sios us air mail Catalogs companies would cost over 10 times price outstanding reference book product lines nearly major man ufacturer distributor importer well unique interesting products small companies seldom advertise national modeling magazines July 83 Model Aviation See Local Dealer Order Direct SAME once Rudder Only RC event thing has start somewhere good things grow get better stand Electric threshold now As Electric products dont see significant changes present day peifor mance levels long time say cause major breakthroughs motor efficiencymore output less less inputare improbable Most motors already quite good Ni-Cds likely remain pretty much now know know no other battery technology horizon will soon re place have simple way looking Lets pretend some really nifty magical battery out packs kinds capacity virtually no space weight Until such battery makes its way electric toothbrushes cordless shavers grass trimmers toys etc such wishbook battery would remain too costly ap plication Please dont misunderstand am saying new products wont con tinuing along However am saying feel performance now have available modeling use about level well seeing several years Thats opinion folks Things Id like see think no dramatic breakthroughs close hand expect see continuing refinement improvement contemporary technology too very safe position assume because thats what has hap pening during past decade con tinuing right now What Im looking new little things will make present products appealinglonger lasting easier use better buys readily available whatever example Id like see armature shafts harder bend Id like see sophisticated chargers accommodate varied battery configurations Id like see motors carefully configured flow-through cooling ducts directed brush-commutator area Id like see kits Electric Id like see versa tile motors design ie such fea tures removable flux rings optional armature windings optimum designs Pro-Built Price Magic DragonEngine 25 cu Wing Span 55 TrainerRadio 3 4 Channels balsa coostroctlee Reedy lbs sand mid cover Control sur faces hisgad Hake Inedleg gem 5/32 nnaa gew otrat Fittad canopy lastractica booklet end dwere Included Pre-Built Price $12496 Engine 40 Cu F ire FoxWing Span 52h Radio 4 Channels balsa cesstroctiea Reody floe sand mid cover Control so. faces hinged Has bolt-es wing end limbo lending gem ASS wheel pasts mounted atelt Installed Fitted cempy leotroctina booklet nod lssrdwnre Included 6 Other ModelsSend Free Brochure 990 16th Street Seed checker M0 Palm HarborCredit Cords occeptod RO $850 UPS FL 33583shIpping hi 350 PSI cain ECHRIC 181317954560FLroooddS%tas DEAL ER INQUIRIES INWTED can made serious modelers time kinds features would find way routine use skilled beginner alike recognize some asking lot five years ago never would have expected see what now market Keep mind have something chicken-and-egg situation Suppliers must have sales products now have make better things future items now have work friends pretty darn good less accept above can see waiting probably wont make major difference go now Read series again necessary think about what youd like fly figure out what will take Make Electric Elation yours Some oversights reflecting series clear could have thorough few areas recent example Part 7 Playboy detailed table vital statistics gave com pleted empty fuselage weight 3 oz reader took task weight correct should have noted landing gear modified gear could attached after covering rather being built-in per plan Theres difficult area need some expansion have seen large vari ety possible electric power options several combinations motors props batteries could produce about same de sired power level may difficult make choice Certainly price availability could factors another factor worth considering battery pack tabulations Part 9 clear about same given power level can achieved relatively higher voltages lower currentsand other way around too Motor prop combinations using higher voltages require cells means higher costs turns out vari ous cell sizes capacities cost about same Thus its possible purchase exactly same energy storage variety prices might now conclude lower voltage higher current way go other considerations Gen 172 Model Aviation FOUR CYCLE ENGINE MOUNTS NEW IUSY PEOPLE KITS CITADRIA STINSON L5 9 NAZLIN 50L 16 INCH ALL BALSA DELUXE PRE-FAB PROFILE FLYING MODELS $695 RUBBER POWER LOG $150 4024636 PECk hPPIar 1 4098675 W BOX 2498 -MA LA MESA CA 92041 Send check money order Con9emers Gold 150 Oft St Hardianburn VA 22801 erally its much harder handle higher current higher voltage may remember discussion about cur rent multiplied itself calculation power losses such wiring motor brushes armature winding resis tance system efficiency suffers more current rises meant confuse rather point out variety con siderations especially serious modeler after last word what can accomplished readers just starting out feel uncomfortable finer points should means go easier route Pick system easy charge less costly go after fun youve tasted success need top what have just done go back reread senes Part 8 Rule Thumb offered guideline power needed cruise want expand bit word may have given wrong impression Cruise has certain comfortable feel ing associated just cruisin along What meant power given Rule Thumb realis tically motor input power needed just barely maintain air space between model terra firmawith some body English thrown good measure can assure know what meantthat ol bend-thestick-back feeling just didnt say cor rectly Anyway power needed put ball park clearly too useful Twice value gets very fly able airplane almost time make bit easier everyone Ive come up graph shows same thing design example Part 9only lot subject power some words about variable power con trols An electronic throttle very nice feature worthwhile have excess power margin other words plane flies rather unim pressively full power pro portional control wouldnt worth having However planes ample power feature can add great deal pleasure flying something left control can some gratifying maneu vers ease just right amount power thing correct landing ap proaches spot landings can become rou tine Slow quiet shoulder-height flybys become awesomeand quite safe because Im talking about some roaring bomb could permanently part hair Finally back Part 2 erroneously wrote prop adapters small motors use hard-to-get 5-40 screws Oops use hard-to-get 6-40 screws ending know must some doubt about series ever ending since has continued grow beyond earlier nouncements really ending follow-up plans mill Spectra construction article coming up will writing continuing column titled RC Electrics intent will offer how-to information monthly basisand some news views too mind Id welcome input information photos interested readers have say CUSTOM TUNED ENGINES COMPETITION ACCESSORIES SPECIALISTS IN CUSTOM COX TD & REED ENGINES STD & R/C CUSTOM PARTS FOR ALL COX ENGINES COMPLETE INVENTORY OF INDIVIDUAL STOCK PARTS FOR ALL CURRENT TD & MEDALLION ENGINES MANY NEW PARTS FOR DiSCONTINUED COX ENGINES HARD CHROMING OTHER COMPETITION ACCESSORIES IGNITION ENGINE SUPPLiES ETC FOR DETAILED BROCHURE SEND T5* TO KUSTOM KRAFTSMANSHIP P0 BOX 2699 LAGUNA HILLS CA 92654 TELEPHONE 014 830-5162 up front cant promise offerings would printed Ill best everyone addition regular column still intend have occasional feature covering some Electric topic too long column formatsort series supplement Good Editor very flexible column format significantly shorter arti cles such can readily see looking various columns issue Anyway can expect continuing Electric coverage variety length particulars turns out another suggested/requested things incoming mail wasyou guessed ita regular column MA Any comments questions series may sent author SASE Bob Kopski 25 West End Dr Lansdale PA 19446 Meanwhile sincere Thank staying series may Electric Elation yours PRODUCTS FOR THE DI$CERNING MODELER Complete Line Exhaust Systems * Tuned Pipes Muffled Tuned Pipes Headers Venturi Mufflers Expansion Mufflers copter Ball Mufflers ialized Exhaust Systems Unsurpss W..Ah nc June 1984 173 J-5s EXCITING NEW GIANT oard Tunneihull Kit clw fiberglass cowl Complete kit 2 hp outboard motor J5 elers ChoIce GMP EPOXIES High Quality Model Construction Jr Kwik Set 6 Minute5 oz * 550 Kwik Set6 MinutelOoz$ 995 Giant wik Set6 Minutel6oz $1295 Half Fast 10 MinutelOoz* 850 GMP AIRCRAFT INSTRUMENTS 80in3116114316112$ 149 40 3/4 inch$ 149 EASY OFF PULLER proper tool removing drive washers flywheels$ 795 Gas Model Products 8773 Russet DR Cinclauatl 0H45239 f513J 385-7398 Emtstwddsrmdsr&wt PutqSAHid$iSO
Edition: Model Aviation - 1984/06
Page Numbers: 78, 79, 80, 82, 171, 172, 173
I Kopski wrap-up author talks about mail received past months gives look future Electric flying covers some over sights omissions previous partsand Part 10conclu sion its really beginning CONCLUSION misnomer word does describe final part series series hardly last word Electrics means about Electrics quite accurate title either can blame editor However hope purpose has fulfilledto share enough expe riences assure first time con tinuing success Electrics under standing installment will attempt review high points series catch up some loose ends respond some mostoften-raised points mail Ive re ceived written Part 7 March issue just appeared obviously has yet no reader feedback Parts 8 9 Review series has appeared con tinuously since September 1983 issue covering everything what Electric to accomplish own flight objec tives Part 1 back September 1983 sales pitch sorts case youve forgotten what Electric good can dig out issue reminder youre still reading series Since Electric new folks general lack familiarity electric motors Part 2 delved sub ject intended help everyone feel ease new prop turners rest series followed introductions out way Part 3 really got series going November 1983 issue relation ship electrical power motors propellers demonstrated saw motors discussed rather similar performance particular saw much difference electri cal input power required turn given prop specific rpm among variety un named motors beyond im portantly saw very dramatic effect propeller size power drain batterythe Electric models fuel tank lessons important planning own Electric undertaking Part 4 got heavily mostoften-misunderstood areas battery part surveyed battery size what means saw size battery weight amount available power related Much said about charging common methods describedincluding favorite conservative charge very safe con78 Model Aviation Left Tracy Keneagy helps show off Ellis Grumers Astro Porterfield model weighs 80 oz wing loading 168 ozIsq ft Power Astro 15 belt drive reducer swings 13-8 wood prop Energy storage 16 cells 55 Ah capacity Author says Porterfield has seen flies very well Right Tom Greets Gentle Lady gets off another flight typically 12 15-mm range weighs 41 oz powered Leisure LT-50 motor 31 gearing swing 9-5 prop Energy provided six 12 Ah Ni-Cd cells venient technique Finally some sugges tions concerning battery installation pre cautions cooling offered So ended 1983 new year brought Parts 5 6 January February issues subject installations requiring two issues cover Looking back topic prob ably out placethe result seemingly continuing extension series proper foresight needed get things right place subject might have better placed after covering what make installation Anyway Parts 5 6 looked motor mounting battery mount ing radio mounting parameter extreme importance successful Electric flying introduced weight Other sub jects basic importance covered switches connectors fuses wiring speed controls prop stops etc Having just covered lot how-to stuff probably found going lighter March issue Part 7 showed graphically what kind flight performance could expected four typical Electric appli cations four models described great detail Data hundreds flights offered pictorial proof Electrics can fly very well indeed saw 5 mm stay stick aerobatics 15 mm Old-Timer laziness routinely possible Part 7 favorite stands solid data base cant argued April MA brought Part 8s shower suggestions sound Electric planning construction first time very grave importance weight quan titatively depicted rules thumb what meant Since its easy come up flimsy lightweight construction sug gestions building strong lightweight models offered Both relative scar city suitable kits growing number magazine plans Electrics noted entire series rapidly came together Part 9 Included extensive tabu lation large variety motor prop battery combinationsand associated operating power levels part taken earlier installments key let know ahead time what would fly well True nowhere cookbook what Electric stuff goes what plane reason no plot flying weight electrical input power static number Electrics author has built flown over years various models wide variation wing loading shown four ranges compare examples guidelines given throughout series will see used least twice cruise power level Several hotter ships much power indicated estimated average power during battery run-down peak burst just after charging Shown also approxi mate motor size ranges most-used motors falling 05 075 range Use graph and/or previous rules thumb relate power systems tabulated Part 9 kind model performance would like obtain Thousands flights went makeup graph models part flew just great Some very same models described much detail earlier series June 1984 79 Another Carl Goldberg Gentle Lady electrified Keith Grote Keith uses Mabuchi 550 SP motor eight Mabuchi AC cells 7-6 prop 44 oz 12-mm flights typical 300 MOTOR POWER INPUT & WEIGHT OF VARIOUS PERSONAL ELECTRICS PARAMETER IS WING LOADING IN OZ/SQFTV PARAMETER LEGEND 2508012____ ____ 2 15 15 18 200-18 v22_____ 4N iso _Ok xIS -A 0 o4 100- 075 A05 U 0 50035 02 0 0 0 10 20 30 40 50 60 70 80 90 100 MODEL WEIGHT ombination can guaranteed cause can easily make anything fly allowing model become unreason ably heavy Better cookbook however virtually unlimited number possible planes just waiting culled out tabulations earlier rules thumb have some simple arithmeticjust like example shown reasonably good building job rest piece cake resulting model should great flier examples Some may still feeling uncertain previous stallments should help assure Electric success key piece information may still obscure much plane self will weigh Part 7 detailed sev eral planes component weights doesnt cover possibilities Actu ally may never have paid much atten tion own building techniques corresponding weights prob ably dont have experienced feel examples Part 7 should help see what planes various sizes can made weigh fly Perhaps chosen design will fall close enough size examples can check construction suggestions Part 8 study various magazine plans other Electrics built and/or drop line see variable can control model weight because almost entirely dependent construc tion materials use Weights motor radio components relatively fixed Thus degree success satisfaction often depend entirely light though durable able make plane fact will go far say almost suitable design power system combination will fly well 4/you dont build model too heavy previously noted kits de signed glow engines Sailplanes suited Electric because struc tural weight kit designs okay structural modifications Some exam ples pictured models flown past KRC Electric Fly events good performers However dont know what particular modifications corporated main point planes can made successful Electrics youre faced impossible Again think light strong Study de sign examples Part 9 apply whats offered throughout series Electric Elation yours mailbag random order So far have received approximately 150 letters maximum mail flow letter day about five weeks late 1983 responded except few required no answerthose writer merely fered commentalways favorable Actu ally few didnt answer because some other rather important notes collectively disap peared day never found 80 Model Aviation think yours might have please write againand forgive same time Some readers wrote once particular wrote seven times Some didnt write called instead most-often-asked question What motor should use such such plane specific question tried give specific answer ingredient common range answers advice weight Please dont impatient saying over over being overweight can kill youand Electric success aswell planes fly great personally could lot lighter Another often-asked question concerns variable-speed controls gliders Its personal preference otherwise com mon choice use variable throttle glider seems people just want get plane up face real challengeto glide long time Nonetheless feel youd enjoy Electric flying speed control glider means Personally like variable-speed control Scale plan use new sport machine designed compete against glow engine planes club fun-fly events number readers took umbrage Part 3 wherein performance several unnamed motors graphed think folks missed point being made motors very similar measured differences fairly small presenta tion fact intended show its mostly prop motor deter mines power input Neither Part 3 nor other part ever intended Elec tric consumers report So far know arent bad motors used graphic presentation has also used own planes Further cases sample given motor type characterized evaluated-surely insufficient evidence form judgment against product Also Part 3 some folks clearly mis understood some basic prop/battery power relationships Others clearly caught up board Some latter sent additional graphs equa tions Two mamrfacturers quired about data give promised fairly large number letters came folks active modelers years past drifted out hobby Now have renewed interest because Electrics Some readers took time tell what flying let tell variety out designs original kit conversion frequently mentioned Its Drifter Two Power always something 05 075 range received few phone calls want mention two two highly experienced highly regarded Electric fliersJim Zarembski RCM columnist Keith Shaw impressive Electric flier Ive ever seen Continued page 82 Olympic Two built Brian Bailie mew has brother John weighs 5Y2 lb powered pod-mounted Astro 25 16 12 Ah cells carried pods beneath wing Uses 9-6 propeller Wing loading comes about 136 ozisq ft 10-mm flights typical Unarles Hampton tiles Airtronics Olympic 650 Mabuchi 550 motor 8-4 prop eight cells size unknown An excellent flier photos month Herb Dirks Incorporated 322 So Gallatin RdMadison TN 37115 615 868-6811 Mon thru Sat am 500 pm - FUTABA RADIO SALE Because care radio systems prechecked f REPAIR SERVICE FOR proper operation prior shipment HOBBY LOBBYFP-7GK 72FMS125 ist535995$24150 E K LOG CT RO LFP-7GK 72AM5-28Iist$35995$22500 FUTABA FTFP-5GK 72FMS-12a Iist$31995$20100 FP-5GK 72AM5-25Iist$28995sisi 50 HOBBY SHACKFP-4LW/3 S-28servosIist$19995$11500 ROYAL LINEAdd $295 Prepaid Mastercard Visa COD $495Tenn residents add 675% tax 82 Model Aviation Jim Keith both picked up po tential trouble spot Part 5 part illustrated preferred battery installation cooling technique cooling air enters above battery flows through cells exits via holes floor fuselage reported stances depending shape fuselage flight characteristics etc peculiar air pressure imbalance can develop prevent airflow out fuselage bottom solution put reverse airscoop forward air exit holes resulting step cures adverse pressure buildup fuselage bottom may explain Ive battery heating problems 1-3 However trying retain scalelike appearance made air intakes rather small Perhaps heating problem resulted com bination both things know cooling method described works very well other planes far scheme Ive used Id like expand Whenever put new model use very carefully check battery motor heat following first several flightsjust make dam sure no gotchas Further after flights some planes often physical evidence good air flow through battery What could Brush dust Several high-powerspending models also spend brushes resulting dust pictured earlier series stuff follows cooling air stream gets deposited anything paththe battery cells right through air exit holes isnt much brush dust 1-3 its hard brushes Im going try suggestion Thanks Jim Keith Some readers reported being interested series cut out articles kept separately Its too bad maga zine articles have spread out over pages thats has Based reader inputs popular Electrics gliders second-mostmentioned type Old-Timers hope thats because folks think nothing else can successfully done Dont forget Scale Aerobatics Pylon Racing great catch-all sport flying Nobody wrote anything about contest terests clearly supports whats lemed Keystone RC Club Electric Fly events far people just want get something flying electric powered pursue simple fun figure sooner later satisfaction success become routine fun will begin mean com petition number comments received la menting seemingly short supply basic Electric information thus endearing series readers default also took note widespread lack dealer interest knowledge Elec trics Several readers requested additional assorted topics covered series Continued page 171 LLL 13311 Beach Ave na Del Rey 1S 1-6242 SALESI RADIO SYSTEMS FUTABA ROYAL ACCESSORIES FOR MOST RADIOSI trics/Kopski Continued page 82 example reader wanted coverage air foils Electrics Others requested series made book Still others wrote wanting buy some models pictured Its very difficult cover everything dont know what means far airfoils go good airfoil glow engine plane its almost certainly good wing section Electric assuming plane also appropriate book has discussedthe outcome certain dont have planes sale does occur theres usually someone whos waiting Some readers asked about suppliers Electric goodies could develop list always chance Id inadvertently miss someone Id want have explain away Besides can al ways thumb through maga zines check ads Catalogs price lists available suppliers usually nominal handling mailing fee Its few cents well spent memorable letter came 14-year-old Tracy Reno wanted know about electric-powered ducted fans Personally have no relevant experience could tell what hoped likely successful truly regret having let down Its likely Ill forget Very sorry Tracy new product Part 4 batteries described two commonly used cell capacities 055 Ah 12 Ah noted latter larger cell size rapidly growing popu larity Since writing new cell size has become available Its 08 Ah capacity available both Astro Leisure have seven-cell battery its weight 9 oz can see individual cells about 13 oz Now lets some arithmetic have stated cell ca pacity weight closely related cells should weigh about 08/12 times weight 12 Ah cell larger cells weigh about 2 oz Both Sanyo Guess what 08/12 x 2 Hows being close Remember theres no magic cant get something nothing havent chance use new pack yet plan Remember south eastern Pennsylvania has four-season year dead winter written should view size option component ever-increasing number Electric parts supplies more stuff use more opportunity Electric flying choices success satisfaction SEAM Society Electric Air craft Modelers new fairly recent founding What really new about SEAM its recent recognition AMA Special Interest Group action places SEAM very important position guiding force matters Electricincluding such things competition rules team selec tion records safety etc Such AMA recog nition assumes SEAM unified voice interested Electrics youve come far series youre clearly interested Electrics go step further drop line Society Electric Aircraft Modelers 11632 Flamingo Dr Garden Grove CA 92644 Ask latest info application member ship Ten bucks adds name grow ing voice gets regular newsletter way SEAM organized district like AMA district has SEAM director Im director District 3 future What likely future Electrics will growth popularity feel sure pretty safe conclusion part no other reason fact Electrics quietand coming more necessary more places course Electrics also convenient quite workable applicable very wide range modeling interests etc Most kind flying fun future also will see introduction refinement Electric classes orga nized competition wonder readers remember knew June 1984 171 4 CYCLE POWEHeu au wINGSPAN SEND $100 FOR COMPLETE CATALOG OF FINE KITS RIC SCALE PLANS Curtlss Hawk P4-E 60 gee 55W eq I. plum$3495 Aeroacs Model K-1937 51 gee $1995 Pipe Super Cub CnaIer PA-Il 51 gem. $1995 PIperPscerPA-2e 59 ge V kde$2995 Piper TiE-Pacer PA-Il 89 gem Scale$2995 DH-5LeopardMoth111s1eaAkuh$1995 DH-80APussMoth111gee.AScd$1995 Sphmks Akroanaster 60 gem 1/5 Seal$1495 Send Self-Addressed Stamped Envelope Complete List HOBBY CAPITOL RIC 46 N Oak St. Ventura CA 93001 Ikon NWST PO Box 566 Auburn WA 98071 206 941-8248 HIgh tensile aluminum alloy Preclslon machIned polished Hardened socket cap screws Included DRILLED AND TAPPED FOR No 31658 ENYA 35-40895 No 31984 ENVA 601295 No 31995 ENYA 901296 No 31452 HP VT 21750 No 31644 HP VT 49896 No 31654 MAX FS 40896 No 31964 MAX FS 60-75-901295 No 32175 MAX FS 1201996 No 31463 SAITO FA 30750 No 31474 SAITO FA 40-45896 No 32196 SAITO FA 1201996 AT MOST HOBBY SHOPS OR ORDER DIRECT Send 100 12 page illustrated catalog L Consumers Guide RC Aircraft Products 242 Pages Hundreds New Products Photos & Descriptions over 2000 RC Aircraft Products fered 176 companies Outstanding Value Only $495 plus shipping* Send $660 Includes UPS ft handling Foreign ordars send $786 US surface mail sios us air mail Catalogs companies would cost over 10 times price outstanding reference book product lines nearly major man ufacturer distributor importer well unique interesting products small companies seldom advertise national modeling magazines July 83 Model Aviation See Local Dealer Order Direct SAME once Rudder Only RC event thing has start somewhere good things grow get better stand Electric threshold now As Electric products dont see significant changes present day peifor mance levels long time say cause major breakthroughs motor efficiencymore output less less inputare improbable Most motors already quite good Ni-Cds likely remain pretty much now know know no other battery technology horizon will soon re place have simple way looking Lets pretend some really nifty magical battery out packs kinds capacity virtually no space weight Until such battery makes its way electric toothbrushes cordless shavers grass trimmers toys etc such wishbook battery would remain too costly ap plication Please dont misunderstand am saying new products wont con tinuing along However am saying feel performance now have available modeling use about level well seeing several years Thats opinion folks Things Id like see think no dramatic breakthroughs close hand expect see continuing refinement improvement contemporary technology too very safe position assume because thats what has hap pening during past decade con tinuing right now What Im looking new little things will make present products appealinglonger lasting easier use better buys readily available whatever example Id like see armature shafts harder bend Id like see sophisticated chargers accommodate varied battery configurations Id like see motors carefully configured flow-through cooling ducts directed brush-commutator area Id like see kits Electric Id like see versa tile motors design ie such fea tures removable flux rings optional armature windings optimum designs Pro-Built Price Magic DragonEngine 25 cu Wing Span 55 TrainerRadio 3 4 Channels balsa coostroctlee Reedy lbs sand mid cover Control sur faces hisgad Hake Inedleg gem 5/32 nnaa gew otrat Fittad canopy lastractica booklet end dwere Included Pre-Built Price $12496 Engine 40 Cu F ire FoxWing Span 52h Radio 4 Channels balsa cesstroctiea Reody floe sand mid cover Control so. faces hinged Has bolt-es wing end limbo lending gem ASS wheel pasts mounted atelt Installed Fitted cempy leotroctina booklet nod lssrdwnre Included 6 Other ModelsSend Free Brochure 990 16th Street Seed checker M0 Palm HarborCredit Cords occeptod RO $850 UPS FL 33583shIpping hi 350 PSI cain ECHRIC 181317954560FLroooddS%tas DEAL ER INQUIRIES INWTED can made serious modelers time kinds features would find way routine use skilled beginner alike recognize some asking lot five years ago never would have expected see what now market Keep mind have something chicken-and-egg situation Suppliers must have sales products now have make better things future items now have work friends pretty darn good less accept above can see waiting probably wont make major difference go now Read series again necessary think about what youd like fly figure out what will take Make Electric Elation yours Some oversights reflecting series clear could have thorough few areas recent example Part 7 Playboy detailed table vital statistics gave com pleted empty fuselage weight 3 oz reader took task weight correct should have noted landing gear modified gear could attached after covering rather being built-in per plan Theres difficult area need some expansion have seen large vari ety possible electric power options several combinations motors props batteries could produce about same de sired power level may difficult make choice Certainly price availability could factors another factor worth considering battery pack tabulations Part 9 clear about same given power level can achieved relatively higher voltages lower currentsand other way around too Motor prop combinations using higher voltages require cells means higher costs turns out vari ous cell sizes capacities cost about same Thus its possible purchase exactly same energy storage variety prices might now conclude lower voltage higher current way go other considerations Gen 172 Model Aviation FOUR CYCLE ENGINE MOUNTS NEW IUSY PEOPLE KITS CITADRIA STINSON L5 9 NAZLIN 50L 16 INCH ALL BALSA DELUXE PRE-FAB PROFILE FLYING MODELS $695 RUBBER POWER LOG $150 4024636 PECk hPPIar 1 4098675 W BOX 2498 -MA LA MESA CA 92041 Send check money order Con9emers Gold 150 Oft St Hardianburn VA 22801 erally its much harder handle higher current higher voltage may remember discussion about cur rent multiplied itself calculation power losses such wiring motor brushes armature winding resis tance system efficiency suffers more current rises meant confuse rather point out variety con siderations especially serious modeler after last word what can accomplished readers just starting out feel uncomfortable finer points should means go easier route Pick system easy charge less costly go after fun youve tasted success need top what have just done go back reread senes Part 8 Rule Thumb offered guideline power needed cruise want expand bit word may have given wrong impression Cruise has certain comfortable feel ing associated just cruisin along What meant power given Rule Thumb realis tically motor input power needed just barely maintain air space between model terra firmawith some body English thrown good measure can assure know what meantthat ol bend-thestick-back feeling just didnt say cor rectly Anyway power needed put ball park clearly too useful Twice value gets very fly able airplane almost time make bit easier everyone Ive come up graph shows same thing design example Part 9only lot subject power some words about variable power con trols An electronic throttle very nice feature worthwhile have excess power margin other words plane flies rather unim pressively full power pro portional control wouldnt worth having However planes ample power feature can add great deal pleasure flying something left control can some gratifying maneu vers ease just right amount power thing correct landing ap proaches spot landings can become rou tine Slow quiet shoulder-height flybys become awesomeand quite safe because Im talking about some roaring bomb could permanently part hair Finally back Part 2 erroneously wrote prop adapters small motors use hard-to-get 5-40 screws Oops use hard-to-get 6-40 screws ending know must some doubt about series ever ending since has continued grow beyond earlier nouncements really ending follow-up plans mill Spectra construction article coming up will writing continuing column titled RC Electrics intent will offer how-to information monthly basisand some news views too mind Id welcome input information photos interested readers have say CUSTOM TUNED ENGINES COMPETITION ACCESSORIES SPECIALISTS IN CUSTOM COX TD & REED ENGINES STD & R/C CUSTOM PARTS FOR ALL COX ENGINES COMPLETE INVENTORY OF INDIVIDUAL STOCK PARTS FOR ALL CURRENT TD & MEDALLION ENGINES MANY NEW PARTS FOR DiSCONTINUED COX ENGINES HARD CHROMING OTHER COMPETITION ACCESSORIES IGNITION ENGINE SUPPLiES ETC FOR DETAILED BROCHURE SEND T5* TO KUSTOM KRAFTSMANSHIP P0 BOX 2699 LAGUNA HILLS CA 92654 TELEPHONE 014 830-5162 up front cant promise offerings would printed Ill best everyone addition regular column still intend have occasional feature covering some Electric topic too long column formatsort series supplement Good Editor very flexible column format significantly shorter arti cles such can readily see looking various columns issue Anyway can expect continuing Electric coverage variety length particulars turns out another suggested/requested things incoming mail wasyou guessed ita regular column MA Any comments questions series may sent author SASE Bob Kopski 25 West End Dr Lansdale PA 19446 Meanwhile sincere Thank staying series may Electric Elation yours PRODUCTS FOR THE DI$CERNING MODELER Complete Line Exhaust Systems * Tuned Pipes Muffled Tuned Pipes Headers Venturi Mufflers Expansion Mufflers copter Ball Mufflers ialized Exhaust Systems Unsurpss W..Ah nc June 1984 173 J-5s EXCITING NEW GIANT oard Tunneihull Kit clw fiberglass cowl Complete kit 2 hp outboard motor J5 elers ChoIce GMP EPOXIES High Quality Model Construction Jr Kwik Set 6 Minute5 oz * 550 Kwik Set6 MinutelOoz$ 995 Giant wik Set6 Minutel6oz $1295 Half Fast 10 MinutelOoz* 850 GMP AIRCRAFT INSTRUMENTS 80in3116114316112$ 149 40 3/4 inch$ 149 EASY OFF PULLER proper tool removing drive washers flywheels$ 795 Gas Model Products 8773 Russet DR Cinclauatl 0H45239 f513J 385-7398 Emtstwddsrmdsr&wt PutqSAHid$iSO
Edition: Model Aviation - 1984/06
Page Numbers: 78, 79, 80, 82, 171, 172, 173
I Kopski wrap-up author talks about mail received past months gives look future Electric flying covers some over sights omissions previous partsand Part 10conclu sion its really beginning CONCLUSION misnomer word does describe final part series series hardly last word Electrics means about Electrics quite accurate title either can blame editor However hope purpose has fulfilledto share enough expe riences assure first time con tinuing success Electrics under standing installment will attempt review high points series catch up some loose ends respond some mostoften-raised points mail Ive re ceived written Part 7 March issue just appeared obviously has yet no reader feedback Parts 8 9 Review series has appeared con tinuously since September 1983 issue covering everything what Electric to accomplish own flight objec tives Part 1 back September 1983 sales pitch sorts case youve forgotten what Electric good can dig out issue reminder youre still reading series Since Electric new folks general lack familiarity electric motors Part 2 delved sub ject intended help everyone feel ease new prop turners rest series followed introductions out way Part 3 really got series going November 1983 issue relation ship electrical power motors propellers demonstrated saw motors discussed rather similar performance particular saw much difference electri cal input power required turn given prop specific rpm among variety un named motors beyond im portantly saw very dramatic effect propeller size power drain batterythe Electric models fuel tank lessons important planning own Electric undertaking Part 4 got heavily mostoften-misunderstood areas battery part surveyed battery size what means saw size battery weight amount available power related Much said about charging common methods describedincluding favorite conservative charge very safe con78 Model Aviation Left Tracy Keneagy helps show off Ellis Grumers Astro Porterfield model weighs 80 oz wing loading 168 ozIsq ft Power Astro 15 belt drive reducer swings 13-8 wood prop Energy storage 16 cells 55 Ah capacity Author says Porterfield has seen flies very well Right Tom Greets Gentle Lady gets off another flight typically 12 15-mm range weighs 41 oz powered Leisure LT-50 motor 31 gearing swing 9-5 prop Energy provided six 12 Ah Ni-Cd cells venient technique Finally some sugges tions concerning battery installation pre cautions cooling offered So ended 1983 new year brought Parts 5 6 January February issues subject installations requiring two issues cover Looking back topic prob ably out placethe result seemingly continuing extension series proper foresight needed get things right place subject might have better placed after covering what make installation Anyway Parts 5 6 looked motor mounting battery mount ing radio mounting parameter extreme importance successful Electric flying introduced weight Other sub jects basic importance covered switches connectors fuses wiring speed controls prop stops etc Having just covered lot how-to stuff probably found going lighter March issue Part 7 showed graphically what kind flight performance could expected four typical Electric appli cations four models described great detail Data hundreds flights offered pictorial proof Electrics can fly very well indeed saw 5 mm stay stick aerobatics 15 mm Old-Timer laziness routinely possible Part 7 favorite stands solid data base cant argued April MA brought Part 8s shower suggestions sound Electric planning construction first time very grave importance weight quan titatively depicted rules thumb what meant Since its easy come up flimsy lightweight construction sug gestions building strong lightweight models offered Both relative scar city suitable kits growing number magazine plans Electrics noted entire series rapidly came together Part 9 Included extensive tabu lation large variety motor prop battery combinationsand associated operating power levels part taken earlier installments key let know ahead time what would fly well True nowhere cookbook what Electric stuff goes what plane reason no plot flying weight electrical input power static number Electrics author has built flown over years various models wide variation wing loading shown four ranges compare examples guidelines given throughout series will see used least twice cruise power level Several hotter ships much power indicated estimated average power during battery run-down peak burst just after charging Shown also approxi mate motor size ranges most-used motors falling 05 075 range Use graph and/or previous rules thumb relate power systems tabulated Part 9 kind model performance would like obtain Thousands flights went makeup graph models part flew just great Some very same models described much detail earlier series June 1984 79 Another Carl Goldberg Gentle Lady electrified Keith Grote Keith uses Mabuchi 550 SP motor eight Mabuchi AC cells 7-6 prop 44 oz 12-mm flights typical 300 MOTOR POWER INPUT & WEIGHT OF VARIOUS PERSONAL ELECTRICS PARAMETER IS WING LOADING IN OZ/SQFTV PARAMETER LEGEND 2508012____ ____ 2 15 15 18 200-18 v22_____ 4N iso _Ok xIS -A 0 o4 100- 075 A05 U 0 50035 02 0 0 0 10 20 30 40 50 60 70 80 90 100 MODEL WEIGHT ombination can guaranteed cause can easily make anything fly allowing model become unreason ably heavy Better cookbook however virtually unlimited number possible planes just waiting culled out tabulations earlier rules thumb have some simple arithmeticjust like example shown reasonably good building job rest piece cake resulting model should great flier examples Some may still feeling uncertain previous stallments should help assure Electric success key piece information may still obscure much plane self will weigh Part 7 detailed sev eral planes component weights doesnt cover possibilities Actu ally may never have paid much atten tion own building techniques corresponding weights prob ably dont have experienced feel examples Part 7 should help see what planes various sizes can made weigh fly Perhaps chosen design will fall close enough size examples can check construction suggestions Part 8 study various magazine plans other Electrics built and/or drop line see variable can control model weight because almost entirely dependent construc tion materials use Weights motor radio components relatively fixed Thus degree success satisfaction often depend entirely light though durable able make plane fact will go far say almost suitable design power system combination will fly well 4/you dont build model too heavy previously noted kits de signed glow engines Sailplanes suited Electric because struc tural weight kit designs okay structural modifications Some exam ples pictured models flown past KRC Electric Fly events good performers However dont know what particular modifications corporated main point planes can made successful Electrics youre faced impossible Again think light strong Study de sign examples Part 9 apply whats offered throughout series Electric Elation yours mailbag random order So far have received approximately 150 letters maximum mail flow letter day about five weeks late 1983 responded except few required no answerthose writer merely fered commentalways favorable Actu ally few didnt answer because some other rather important notes collectively disap peared day never found 80 Model Aviation think yours might have please write againand forgive same time Some readers wrote once particular wrote seven times Some didnt write called instead most-often-asked question What motor should use such such plane specific question tried give specific answer ingredient common range answers advice weight Please dont impatient saying over over being overweight can kill youand Electric success aswell planes fly great personally could lot lighter Another often-asked question concerns variable-speed controls gliders Its personal preference otherwise com mon choice use variable throttle glider seems people just want get plane up face real challengeto glide long time Nonetheless feel youd enjoy Electric flying speed control glider means Personally like variable-speed control Scale plan use new sport machine designed compete against glow engine planes club fun-fly events number readers took umbrage Part 3 wherein performance several unnamed motors graphed think folks missed point being made motors very similar measured differences fairly small presenta tion fact intended show its mostly prop motor deter mines power input Neither Part 3 nor other part ever intended Elec tric consumers report So far know arent bad motors used graphic presentation has also used own planes Further cases sample given motor type characterized evaluated-surely insufficient evidence form judgment against product Also Part 3 some folks clearly mis understood some basic prop/battery power relationships Others clearly caught up board Some latter sent additional graphs equa tions Two mamrfacturers quired about data give promised fairly large number letters came folks active modelers years past drifted out hobby Now have renewed interest because Electrics Some readers took time tell what flying let tell variety out designs original kit conversion frequently mentioned Its Drifter Two Power always something 05 075 range received few phone calls want mention two two highly experienced highly regarded Electric fliersJim Zarembski RCM columnist Keith Shaw impressive Electric flier Ive ever seen Continued page 82 Olympic Two built Brian Bailie mew has brother John weighs 5Y2 lb powered pod-mounted Astro 25 16 12 Ah cells carried pods beneath wing Uses 9-6 propeller Wing loading comes about 136 ozisq ft 10-mm flights typical Unarles Hampton tiles Airtronics Olympic 650 Mabuchi 550 motor 8-4 prop eight cells size unknown An excellent flier photos month Herb Dirks Incorporated 322 So Gallatin RdMadison TN 37115 615 868-6811 Mon thru Sat am 500 pm - FUTABA RADIO SALE Because care radio systems prechecked f REPAIR SERVICE FOR proper operation prior shipment HOBBY LOBBYFP-7GK 72FMS125 ist535995$24150 E K LOG CT RO LFP-7GK 72AM5-28Iist$35995$22500 FUTABA FTFP-5GK 72FMS-12a Iist$31995$20100 FP-5GK 72AM5-25Iist$28995sisi 50 HOBBY SHACKFP-4LW/3 S-28servosIist$19995$11500 ROYAL LINEAdd $295 Prepaid Mastercard Visa COD $495Tenn residents add 675% tax 82 Model Aviation Jim Keith both picked up po tential trouble spot Part 5 part illustrated preferred battery installation cooling technique cooling air enters above battery flows through cells exits via holes floor fuselage reported stances depending shape fuselage flight characteristics etc peculiar air pressure imbalance can develop prevent airflow out fuselage bottom solution put reverse airscoop forward air exit holes resulting step cures adverse pressure buildup fuselage bottom may explain Ive battery heating problems 1-3 However trying retain scalelike appearance made air intakes rather small Perhaps heating problem resulted com bination both things know cooling method described works very well other planes far scheme Ive used Id like expand Whenever put new model use very carefully check battery motor heat following first several flightsjust make dam sure no gotchas Further after flights some planes often physical evidence good air flow through battery What could Brush dust Several high-powerspending models also spend brushes resulting dust pictured earlier series stuff follows cooling air stream gets deposited anything paththe battery cells right through air exit holes isnt much brush dust 1-3 its hard brushes Im going try suggestion Thanks Jim Keith Some readers reported being interested series cut out articles kept separately Its too bad maga zine articles have spread out over pages thats has Based reader inputs popular Electrics gliders second-mostmentioned type Old-Timers hope thats because folks think nothing else can successfully done Dont forget Scale Aerobatics Pylon Racing great catch-all sport flying Nobody wrote anything about contest terests clearly supports whats lemed Keystone RC Club Electric Fly events far people just want get something flying electric powered pursue simple fun figure sooner later satisfaction success become routine fun will begin mean com petition number comments received la menting seemingly short supply basic Electric information thus endearing series readers default also took note widespread lack dealer interest knowledge Elec trics Several readers requested additional assorted topics covered series Continued page 171 LLL 13311 Beach Ave na Del Rey 1S 1-6242 SALESI RADIO SYSTEMS FUTABA ROYAL ACCESSORIES FOR MOST RADIOSI trics/Kopski Continued page 82 example reader wanted coverage air foils Electrics Others requested series made book Still others wrote wanting buy some models pictured Its very difficult cover everything dont know what means far airfoils go good airfoil glow engine plane its almost certainly good wing section Electric assuming plane also appropriate book has discussedthe outcome certain dont have planes sale does occur theres usually someone whos waiting Some readers asked about suppliers Electric goodies could develop list always chance Id inadvertently miss someone Id want have explain away Besides can al ways thumb through maga zines check ads Catalogs price lists available suppliers usually nominal handling mailing fee Its few cents well spent memorable letter came 14-year-old Tracy Reno wanted know about electric-powered ducted fans Personally have no relevant experience could tell what hoped likely successful truly regret having let down Its likely Ill forget Very sorry Tracy new product Part 4 batteries described two commonly used cell capacities 055 Ah 12 Ah noted latter larger cell size rapidly growing popu larity Since writing new cell size has become available Its 08 Ah capacity available both Astro Leisure have seven-cell battery its weight 9 oz can see individual cells about 13 oz Now lets some arithmetic have stated cell ca pacity weight closely related cells should weigh about 08/12 times weight 12 Ah cell larger cells weigh about 2 oz Both Sanyo Guess what 08/12 x 2 Hows being close Remember theres no magic cant get something nothing havent chance use new pack yet plan Remember south eastern Pennsylvania has four-season year dead winter written should view size option component ever-increasing number Electric parts supplies more stuff use more opportunity Electric flying choices success satisfaction SEAM Society Electric Air craft Modelers new fairly recent founding What really new about SEAM its recent recognition AMA Special Interest Group action places SEAM very important position guiding force matters Electricincluding such things competition rules team selec tion records safety etc Such AMA recog nition assumes SEAM unified voice interested Electrics youve come far series youre clearly interested Electrics go step further drop line Society Electric Aircraft Modelers 11632 Flamingo Dr Garden Grove CA 92644 Ask latest info application member ship Ten bucks adds name grow ing voice gets regular newsletter way SEAM organized district like AMA district has SEAM director Im director District 3 future What likely future Electrics will growth popularity feel sure pretty safe conclusion part no other reason fact Electrics quietand coming more necessary more places course Electrics also convenient quite workable applicable very wide range modeling interests etc Most kind flying fun future also will see introduction refinement Electric classes orga nized competition wonder readers remember knew June 1984 171 4 CYCLE POWEHeu au wINGSPAN SEND $100 FOR COMPLETE CATALOG OF FINE KITS RIC SCALE PLANS Curtlss Hawk P4-E 60 gee 55W eq I. plum$3495 Aeroacs Model K-1937 51 gee $1995 Pipe Super Cub CnaIer PA-Il 51 gem. $1995 PIperPscerPA-2e 59 ge V kde$2995 Piper TiE-Pacer PA-Il 89 gem Scale$2995 DH-5LeopardMoth111s1eaAkuh$1995 DH-80APussMoth111gee.AScd$1995 Sphmks Akroanaster 60 gem 1/5 Seal$1495 Send Self-Addressed Stamped Envelope Complete List HOBBY CAPITOL RIC 46 N Oak St. Ventura CA 93001 Ikon NWST PO Box 566 Auburn WA 98071 206 941-8248 HIgh tensile aluminum alloy Preclslon machIned polished Hardened socket cap screws Included DRILLED AND TAPPED FOR No 31658 ENYA 35-40895 No 31984 ENVA 601295 No 31995 ENYA 901296 No 31452 HP VT 21750 No 31644 HP VT 49896 No 31654 MAX FS 40896 No 31964 MAX FS 60-75-901295 No 32175 MAX FS 1201996 No 31463 SAITO FA 30750 No 31474 SAITO FA 40-45896 No 32196 SAITO FA 1201996 AT MOST HOBBY SHOPS OR ORDER DIRECT Send 100 12 page illustrated catalog L Consumers Guide RC Aircraft Products 242 Pages Hundreds New Products Photos & Descriptions over 2000 RC Aircraft Products fered 176 companies Outstanding Value Only $495 plus shipping* Send $660 Includes UPS ft handling Foreign ordars send $786 US surface mail sios us air mail Catalogs companies would cost over 10 times price outstanding reference book product lines nearly major man ufacturer distributor importer well unique interesting products small companies seldom advertise national modeling magazines July 83 Model Aviation See Local Dealer Order Direct SAME once Rudder Only RC event thing has start somewhere good things grow get better stand Electric threshold now As Electric products dont see significant changes present day peifor mance levels long time say cause major breakthroughs motor efficiencymore output less less inputare improbable Most motors already quite good Ni-Cds likely remain pretty much now know know no other battery technology horizon will soon re place have simple way looking Lets pretend some really nifty magical battery out packs kinds capacity virtually no space weight Until such battery makes its way electric toothbrushes cordless shavers grass trimmers toys etc such wishbook battery would remain too costly ap plication Please dont misunderstand am saying new products wont con tinuing along However am saying feel performance now have available modeling use about level well seeing several years Thats opinion folks Things Id like see think no dramatic breakthroughs close hand expect see continuing refinement improvement contemporary technology too very safe position assume because thats what has hap pening during past decade con tinuing right now What Im looking new little things will make present products appealinglonger lasting easier use better buys readily available whatever example Id like see armature shafts harder bend Id like see sophisticated chargers accommodate varied battery configurations Id like see motors carefully configured flow-through cooling ducts directed brush-commutator area Id like see kits Electric Id like see versa tile motors design ie such fea tures removable flux rings optional armature windings optimum designs Pro-Built Price Magic DragonEngine 25 cu Wing Span 55 TrainerRadio 3 4 Channels balsa coostroctlee Reedy lbs sand mid cover Control sur faces hisgad Hake Inedleg gem 5/32 nnaa gew otrat Fittad canopy lastractica booklet end dwere Included Pre-Built Price $12496 Engine 40 Cu F ire FoxWing Span 52h Radio 4 Channels balsa cesstroctiea Reody floe sand mid cover Control so. faces hinged Has bolt-es wing end limbo lending gem ASS wheel pasts mounted atelt Installed Fitted cempy leotroctina booklet nod lssrdwnre Included 6 Other ModelsSend Free Brochure 990 16th Street Seed checker M0 Palm HarborCredit Cords occeptod RO $850 UPS FL 33583shIpping hi 350 PSI cain ECHRIC 181317954560FLroooddS%tas DEAL ER INQUIRIES INWTED can made serious modelers time kinds features would find way routine use skilled beginner alike recognize some asking lot five years ago never would have expected see what now market Keep mind have something chicken-and-egg situation Suppliers must have sales products now have make better things future items now have work friends pretty darn good less accept above can see waiting probably wont make major difference go now Read series again necessary think about what youd like fly figure out what will take Make Electric Elation yours Some oversights reflecting series clear could have thorough few areas recent example Part 7 Playboy detailed table vital statistics gave com pleted empty fuselage weight 3 oz reader took task weight correct should have noted landing gear modified gear could attached after covering rather being built-in per plan Theres difficult area need some expansion have seen large vari ety possible electric power options several combinations motors props batteries could produce about same de sired power level may difficult make choice Certainly price availability could factors another factor worth considering battery pack tabulations Part 9 clear about same given power level can achieved relatively higher voltages lower currentsand other way around too Motor prop combinations using higher voltages require cells means higher costs turns out vari ous cell sizes capacities cost about same Thus its possible purchase exactly same energy storage variety prices might now conclude lower voltage higher current way go other considerations Gen 172 Model Aviation FOUR CYCLE ENGINE MOUNTS NEW IUSY PEOPLE KITS CITADRIA STINSON L5 9 NAZLIN 50L 16 INCH ALL BALSA DELUXE PRE-FAB PROFILE FLYING MODELS $695 RUBBER POWER LOG $150 4024636 PECk hPPIar 1 4098675 W BOX 2498 -MA LA MESA CA 92041 Send check money order Con9emers Gold 150 Oft St Hardianburn VA 22801 erally its much harder handle higher current higher voltage may remember discussion about cur rent multiplied itself calculation power losses such wiring motor brushes armature winding resis tance system efficiency suffers more current rises meant confuse rather point out variety con siderations especially serious modeler after last word what can accomplished readers just starting out feel uncomfortable finer points should means go easier route Pick system easy charge less costly go after fun youve tasted success need top what have just done go back reread senes Part 8 Rule Thumb offered guideline power needed cruise want expand bit word may have given wrong impression Cruise has certain comfortable feel ing associated just cruisin along What meant power given Rule Thumb realis tically motor input power needed just barely maintain air space between model terra firmawith some body English thrown good measure can assure know what meantthat ol bend-thestick-back feeling just didnt say cor rectly Anyway power needed put ball park clearly too useful Twice value gets very fly able airplane almost time make bit easier everyone Ive come up graph shows same thing design example Part 9only lot subject power some words about variable power con trols An electronic throttle very nice feature worthwhile have excess power margin other words plane flies rather unim pressively full power pro portional control wouldnt worth having However planes ample power feature can add great deal pleasure flying something left control can some gratifying maneu vers ease just right amount power thing correct landing ap proaches spot landings can become rou tine Slow quiet shoulder-height flybys become awesomeand quite safe because Im talking about some roaring bomb could permanently part hair Finally back Part 2 erroneously wrote prop adapters small motors use hard-to-get 5-40 screws Oops use hard-to-get 6-40 screws ending know must some doubt about series ever ending since has continued grow beyond earlier nouncements really ending follow-up plans mill Spectra construction article coming up will writing continuing column titled RC Electrics intent will offer how-to information monthly basisand some news views too mind Id welcome input information photos interested readers have say CUSTOM TUNED ENGINES COMPETITION ACCESSORIES SPECIALISTS IN CUSTOM COX TD & REED ENGINES STD & R/C CUSTOM PARTS FOR ALL COX ENGINES COMPLETE INVENTORY OF INDIVIDUAL STOCK PARTS FOR ALL CURRENT TD & MEDALLION ENGINES MANY NEW PARTS FOR DiSCONTINUED COX ENGINES HARD CHROMING OTHER COMPETITION ACCESSORIES IGNITION ENGINE SUPPLiES ETC FOR DETAILED BROCHURE SEND T5* TO KUSTOM KRAFTSMANSHIP P0 BOX 2699 LAGUNA HILLS CA 92654 TELEPHONE 014 830-5162 up front cant promise offerings would printed Ill best everyone addition regular column still intend have occasional feature covering some Electric topic too long column formatsort series supplement Good Editor very flexible column format significantly shorter arti cles such can readily see looking various columns issue Anyway can expect continuing Electric coverage variety length particulars turns out another suggested/requested things incoming mail wasyou guessed ita regular column MA Any comments questions series may sent author SASE Bob Kopski 25 West End Dr Lansdale PA 19446 Meanwhile sincere Thank staying series may Electric Elation yours PRODUCTS FOR THE DI$CERNING MODELER Complete Line Exhaust Systems * Tuned Pipes Muffled Tuned Pipes Headers Venturi Mufflers Expansion Mufflers copter Ball Mufflers ialized Exhaust Systems Unsurpss W..Ah nc June 1984 173 J-5s EXCITING NEW GIANT oard Tunneihull Kit clw fiberglass cowl Complete kit 2 hp outboard motor J5 elers ChoIce GMP EPOXIES High Quality Model Construction Jr Kwik Set 6 Minute5 oz * 550 Kwik Set6 MinutelOoz$ 995 Giant wik Set6 Minutel6oz $1295 Half Fast 10 MinutelOoz* 850 GMP AIRCRAFT INSTRUMENTS 80in3116114316112$ 149 40 3/4 inch$ 149 EASY OFF PULLER proper tool removing drive washers flywheels$ 795 Gas Model Products 8773 Russet DR Cinclauatl 0H45239 f513J 385-7398 Emtstwddsrmdsr&wt PutqSAHid$iSO
Edition: Model Aviation - 1984/06
Page Numbers: 78, 79, 80, 82, 171, 172, 173
I Kopski wrap-up author talks about mail received past months gives look future Electric flying covers some over sights omissions previous partsand Part 10conclu sion its really beginning CONCLUSION misnomer word does describe final part series series hardly last word Electrics means about Electrics quite accurate title either can blame editor However hope purpose has fulfilledto share enough expe riences assure first time con tinuing success Electrics under standing installment will attempt review high points series catch up some loose ends respond some mostoften-raised points mail Ive re ceived written Part 7 March issue just appeared obviously has yet no reader feedback Parts 8 9 Review series has appeared con tinuously since September 1983 issue covering everything what Electric to accomplish own flight objec tives Part 1 back September 1983 sales pitch sorts case youve forgotten what Electric good can dig out issue reminder youre still reading series Since Electric new folks general lack familiarity electric motors Part 2 delved sub ject intended help everyone feel ease new prop turners rest series followed introductions out way Part 3 really got series going November 1983 issue relation ship electrical power motors propellers demonstrated saw motors discussed rather similar performance particular saw much difference electri cal input power required turn given prop specific rpm among variety un named motors beyond im portantly saw very dramatic effect propeller size power drain batterythe Electric models fuel tank lessons important planning own Electric undertaking Part 4 got heavily mostoften-misunderstood areas battery part surveyed battery size what means saw size battery weight amount available power related Much said about charging common methods describedincluding favorite conservative charge very safe con78 Model Aviation Left Tracy Keneagy helps show off Ellis Grumers Astro Porterfield model weighs 80 oz wing loading 168 ozIsq ft Power Astro 15 belt drive reducer swings 13-8 wood prop Energy storage 16 cells 55 Ah capacity Author says Porterfield has seen flies very well Right Tom Greets Gentle Lady gets off another flight typically 12 15-mm range weighs 41 oz powered Leisure LT-50 motor 31 gearing swing 9-5 prop Energy provided six 12 Ah Ni-Cd cells venient technique Finally some sugges tions concerning battery installation pre cautions cooling offered So ended 1983 new year brought Parts 5 6 January February issues subject installations requiring two issues cover Looking back topic prob ably out placethe result seemingly continuing extension series proper foresight needed get things right place subject might have better placed after covering what make installation Anyway Parts 5 6 looked motor mounting battery mount ing radio mounting parameter extreme importance successful Electric flying introduced weight Other sub jects basic importance covered switches connectors fuses wiring speed controls prop stops etc Having just covered lot how-to stuff probably found going lighter March issue Part 7 showed graphically what kind flight performance could expected four typical Electric appli cations four models described great detail Data hundreds flights offered pictorial proof Electrics can fly very well indeed saw 5 mm stay stick aerobatics 15 mm Old-Timer laziness routinely possible Part 7 favorite stands solid data base cant argued April MA brought Part 8s shower suggestions sound Electric planning construction first time very grave importance weight quan titatively depicted rules thumb what meant Since its easy come up flimsy lightweight construction sug gestions building strong lightweight models offered Both relative scar city suitable kits growing number magazine plans Electrics noted entire series rapidly came together Part 9 Included extensive tabu lation large variety motor prop battery combinationsand associated operating power levels part taken earlier installments key let know ahead time what would fly well True nowhere cookbook what Electric stuff goes what plane reason no plot flying weight electrical input power static number Electrics author has built flown over years various models wide variation wing loading shown four ranges compare examples guidelines given throughout series will see used least twice cruise power level Several hotter ships much power indicated estimated average power during battery run-down peak burst just after charging Shown also approxi mate motor size ranges most-used motors falling 05 075 range Use graph and/or previous rules thumb relate power systems tabulated Part 9 kind model performance would like obtain Thousands flights went makeup graph models part flew just great Some very same models described much detail earlier series June 1984 79 Another Carl Goldberg Gentle Lady electrified Keith Grote Keith uses Mabuchi 550 SP motor eight Mabuchi AC cells 7-6 prop 44 oz 12-mm flights typical 300 MOTOR POWER INPUT & WEIGHT OF VARIOUS PERSONAL ELECTRICS PARAMETER IS WING LOADING IN OZ/SQFTV PARAMETER LEGEND 2508012____ ____ 2 15 15 18 200-18 v22_____ 4N iso _Ok xIS -A 0 o4 100- 075 A05 U 0 50035 02 0 0 0 10 20 30 40 50 60 70 80 90 100 MODEL WEIGHT ombination can guaranteed cause can easily make anything fly allowing model become unreason ably heavy Better cookbook however virtually unlimited number possible planes just waiting culled out tabulations earlier rules thumb have some simple arithmeticjust like example shown reasonably good building job rest piece cake resulting model should great flier examples Some may still feeling uncertain previous stallments should help assure Electric success key piece information may still obscure much plane self will weigh Part 7 detailed sev eral planes component weights doesnt cover possibilities Actu ally may never have paid much atten tion own building techniques corresponding weights prob ably dont have experienced feel examples Part 7 should help see what planes various sizes can made weigh fly Perhaps chosen design will fall close enough size examples can check construction suggestions Part 8 study various magazine plans other Electrics built and/or drop line see variable can control model weight because almost entirely dependent construc tion materials use Weights motor radio components relatively fixed Thus degree success satisfaction often depend entirely light though durable able make plane fact will go far say almost suitable design power system combination will fly well 4/you dont build model too heavy previously noted kits de signed glow engines Sailplanes suited Electric because struc tural weight kit designs okay structural modifications Some exam ples pictured models flown past KRC Electric Fly events good performers However dont know what particular modifications corporated main point planes can made successful Electrics youre faced impossible Again think light strong Study de sign examples Part 9 apply whats offered throughout series Electric Elation yours mailbag random order So far have received approximately 150 letters maximum mail flow letter day about five weeks late 1983 responded except few required no answerthose writer merely fered commentalways favorable Actu ally few didnt answer because some other rather important notes collectively disap peared day never found 80 Model Aviation think yours might have please write againand forgive same time Some readers wrote once particular wrote seven times Some didnt write called instead most-often-asked question What motor should use such such plane specific question tried give specific answer ingredient common range answers advice weight Please dont impatient saying over over being overweight can kill youand Electric success aswell planes fly great personally could lot lighter Another often-asked question concerns variable-speed controls gliders Its personal preference otherwise com mon choice use variable throttle glider seems people just want get plane up face real challengeto glide long time Nonetheless feel youd enjoy Electric flying speed control glider means Personally like variable-speed control Scale plan use new sport machine designed compete against glow engine planes club fun-fly events number readers took umbrage Part 3 wherein performance several unnamed motors graphed think folks missed point being made motors very similar measured differences fairly small presenta tion fact intended show its mostly prop motor deter mines power input Neither Part 3 nor other part ever intended Elec tric consumers report So far know arent bad motors used graphic presentation has also used own planes Further cases sample given motor type characterized evaluated-surely insufficient evidence form judgment against product Also Part 3 some folks clearly mis understood some basic prop/battery power relationships Others clearly caught up board Some latter sent additional graphs equa tions Two mamrfacturers quired about data give promised fairly large number letters came folks active modelers years past drifted out hobby Now have renewed interest because Electrics Some readers took time tell what flying let tell variety out designs original kit conversion frequently mentioned Its Drifter Two Power always something 05 075 range received few phone calls want mention two two highly experienced highly regarded Electric fliersJim Zarembski RCM columnist Keith Shaw impressive Electric flier Ive ever seen Continued page 82 Olympic Two built Brian Bailie mew has brother John weighs 5Y2 lb powered pod-mounted Astro 25 16 12 Ah cells carried pods beneath wing Uses 9-6 propeller Wing loading comes about 136 ozisq ft 10-mm flights typical Unarles Hampton tiles Airtronics Olympic 650 Mabuchi 550 motor 8-4 prop eight cells size unknown An excellent flier photos month Herb Dirks Incorporated 322 So Gallatin RdMadison TN 37115 615 868-6811 Mon thru Sat am 500 pm - FUTABA RADIO SALE Because care radio systems prechecked f REPAIR SERVICE FOR proper operation prior shipment HOBBY LOBBYFP-7GK 72FMS125 ist535995$24150 E K LOG CT RO LFP-7GK 72AM5-28Iist$35995$22500 FUTABA FTFP-5GK 72FMS-12a Iist$31995$20100 FP-5GK 72AM5-25Iist$28995sisi 50 HOBBY SHACKFP-4LW/3 S-28servosIist$19995$11500 ROYAL LINEAdd $295 Prepaid Mastercard Visa COD $495Tenn residents add 675% tax 82 Model Aviation Jim Keith both picked up po tential trouble spot Part 5 part illustrated preferred battery installation cooling technique cooling air enters above battery flows through cells exits via holes floor fuselage reported stances depending shape fuselage flight characteristics etc peculiar air pressure imbalance can develop prevent airflow out fuselage bottom solution put reverse airscoop forward air exit holes resulting step cures adverse pressure buildup fuselage bottom may explain Ive battery heating problems 1-3 However trying retain scalelike appearance made air intakes rather small Perhaps heating problem resulted com bination both things know cooling method described works very well other planes far scheme Ive used Id like expand Whenever put new model use very carefully check battery motor heat following first several flightsjust make dam sure no gotchas Further after flights some planes often physical evidence good air flow through battery What could Brush dust Several high-powerspending models also spend brushes resulting dust pictured earlier series stuff follows cooling air stream gets deposited anything paththe battery cells right through air exit holes isnt much brush dust 1-3 its hard brushes Im going try suggestion Thanks Jim Keith Some readers reported being interested series cut out articles kept separately Its too bad maga zine articles have spread out over pages thats has Based reader inputs popular Electrics gliders second-mostmentioned type Old-Timers hope thats because folks think nothing else can successfully done Dont forget Scale Aerobatics Pylon Racing great catch-all sport flying Nobody wrote anything about contest terests clearly supports whats lemed Keystone RC Club Electric Fly events far people just want get something flying electric powered pursue simple fun figure sooner later satisfaction success become routine fun will begin mean com petition number comments received la menting seemingly short supply basic Electric information thus endearing series readers default also took note widespread lack dealer interest knowledge Elec trics Several readers requested additional assorted topics covered series Continued page 171 LLL 13311 Beach Ave na Del Rey 1S 1-6242 SALESI RADIO SYSTEMS FUTABA ROYAL ACCESSORIES FOR MOST RADIOSI trics/Kopski Continued page 82 example reader wanted coverage air foils Electrics Others requested series made book Still others wrote wanting buy some models pictured Its very difficult cover everything dont know what means far airfoils go good airfoil glow engine plane its almost certainly good wing section Electric assuming plane also appropriate book has discussedthe outcome certain dont have planes sale does occur theres usually someone whos waiting Some readers asked about suppliers Electric goodies could develop list always chance Id inadvertently miss someone Id want have explain away Besides can al ways thumb through maga zines check ads Catalogs price lists available suppliers usually nominal handling mailing fee Its few cents well spent memorable letter came 14-year-old Tracy Reno wanted know about electric-powered ducted fans Personally have no relevant experience could tell what hoped likely successful truly regret having let down Its likely Ill forget Very sorry Tracy new product Part 4 batteries described two commonly used cell capacities 055 Ah 12 Ah noted latter larger cell size rapidly growing popu larity Since writing new cell size has become available Its 08 Ah capacity available both Astro Leisure have seven-cell battery its weight 9 oz can see individual cells about 13 oz Now lets some arithmetic have stated cell ca pacity weight closely related cells should weigh about 08/12 times weight 12 Ah cell larger cells weigh about 2 oz Both Sanyo Guess what 08/12 x 2 Hows being close Remember theres no magic cant get something nothing havent chance use new pack yet plan Remember south eastern Pennsylvania has four-season year dead winter written should view size option component ever-increasing number Electric parts supplies more stuff use more opportunity Electric flying choices success satisfaction SEAM Society Electric Air craft Modelers new fairly recent founding What really new about SEAM its recent recognition AMA Special Interest Group action places SEAM very important position guiding force matters Electricincluding such things competition rules team selec tion records safety etc Such AMA recog nition assumes SEAM unified voice interested Electrics youve come far series youre clearly interested Electrics go step further drop line Society Electric Aircraft Modelers 11632 Flamingo Dr Garden Grove CA 92644 Ask latest info application member ship Ten bucks adds name grow ing voice gets regular newsletter way SEAM organized district like AMA district has SEAM director Im director District 3 future What likely future Electrics will growth popularity feel sure pretty safe conclusion part no other reason fact Electrics quietand coming more necessary more places course Electrics also convenient quite workable applicable very wide range modeling interests etc Most kind flying fun future also will see introduction refinement Electric classes orga nized competition wonder readers remember knew June 1984 171 4 CYCLE POWEHeu au wINGSPAN SEND $100 FOR COMPLETE CATALOG OF FINE KITS RIC SCALE PLANS Curtlss Hawk P4-E 60 gee 55W eq I. plum$3495 Aeroacs Model K-1937 51 gee $1995 Pipe Super Cub CnaIer PA-Il 51 gem. $1995 PIperPscerPA-2e 59 ge V kde$2995 Piper TiE-Pacer PA-Il 89 gem Scale$2995 DH-5LeopardMoth111s1eaAkuh$1995 DH-80APussMoth111gee.AScd$1995 Sphmks Akroanaster 60 gem 1/5 Seal$1495 Send Self-Addressed Stamped Envelope Complete List HOBBY CAPITOL RIC 46 N Oak St. Ventura CA 93001 Ikon NWST PO Box 566 Auburn WA 98071 206 941-8248 HIgh tensile aluminum alloy Preclslon machIned polished Hardened socket cap screws Included DRILLED AND TAPPED FOR No 31658 ENYA 35-40895 No 31984 ENVA 601295 No 31995 ENYA 901296 No 31452 HP VT 21750 No 31644 HP VT 49896 No 31654 MAX FS 40896 No 31964 MAX FS 60-75-901295 No 32175 MAX FS 1201996 No 31463 SAITO FA 30750 No 31474 SAITO FA 40-45896 No 32196 SAITO FA 1201996 AT MOST HOBBY SHOPS OR ORDER DIRECT Send 100 12 page illustrated catalog L Consumers Guide RC Aircraft Products 242 Pages Hundreds New Products Photos & Descriptions over 2000 RC Aircraft Products fered 176 companies Outstanding Value Only $495 plus shipping* Send $660 Includes UPS ft handling Foreign ordars send $786 US surface mail sios us air mail Catalogs companies would cost over 10 times price outstanding reference book product lines nearly major man ufacturer distributor importer well unique interesting products small companies seldom advertise national modeling magazines July 83 Model Aviation See Local Dealer Order Direct SAME once Rudder Only RC event thing has start somewhere good things grow get better stand Electric threshold now As Electric products dont see significant changes present day peifor mance levels long time say cause major breakthroughs motor efficiencymore output less less inputare improbable Most motors already quite good Ni-Cds likely remain pretty much now know know no other battery technology horizon will soon re place have simple way looking Lets pretend some really nifty magical battery out packs kinds capacity virtually no space weight Until such battery makes its way electric toothbrushes cordless shavers grass trimmers toys etc such wishbook battery would remain too costly ap plication Please dont misunderstand am saying new products wont con tinuing along However am saying feel performance now have available modeling use about level well seeing several years Thats opinion folks Things Id like see think no dramatic breakthroughs close hand expect see continuing refinement improvement contemporary technology too very safe position assume because thats what has hap pening during past decade con tinuing right now What Im looking new little things will make present products appealinglonger lasting easier use better buys readily available whatever example Id like see armature shafts harder bend Id like see sophisticated chargers accommodate varied battery configurations Id like see motors carefully configured flow-through cooling ducts directed brush-commutator area Id like see kits Electric Id like see versa tile motors design ie such fea tures removable flux rings optional armature windings optimum designs Pro-Built Price Magic DragonEngine 25 cu Wing Span 55 TrainerRadio 3 4 Channels balsa coostroctlee Reedy lbs sand mid cover Control sur faces hisgad Hake Inedleg gem 5/32 nnaa gew otrat Fittad canopy lastractica booklet end dwere Included Pre-Built Price $12496 Engine 40 Cu F ire FoxWing Span 52h Radio 4 Channels balsa cesstroctiea Reody floe sand mid cover Control so. faces hinged Has bolt-es wing end limbo lending gem ASS wheel pasts mounted atelt Installed Fitted cempy leotroctina booklet nod lssrdwnre Included 6 Other ModelsSend Free Brochure 990 16th Street Seed checker M0 Palm HarborCredit Cords occeptod RO $850 UPS FL 33583shIpping hi 350 PSI cain ECHRIC 181317954560FLroooddS%tas DEAL ER INQUIRIES INWTED can made serious modelers time kinds features would find way routine use skilled beginner alike recognize some asking lot five years ago never would have expected see what now market Keep mind have something chicken-and-egg situation Suppliers must have sales products now have make better things future items now have work friends pretty darn good less accept above can see waiting probably wont make major difference go now Read series again necessary think about what youd like fly figure out what will take Make Electric Elation yours Some oversights reflecting series clear could have thorough few areas recent example Part 7 Playboy detailed table vital statistics gave com pleted empty fuselage weight 3 oz reader took task weight correct should have noted landing gear modified gear could attached after covering rather being built-in per plan Theres difficult area need some expansion have seen large vari ety possible electric power options several combinations motors props batteries could produce about same de sired power level may difficult make choice Certainly price availability could factors another factor worth considering battery pack tabulations Part 9 clear about same given power level can achieved relatively higher voltages lower currentsand other way around too Motor prop combinations using higher voltages require cells means higher costs turns out vari ous cell sizes capacities cost about same Thus its possible purchase exactly same energy storage variety prices might now conclude lower voltage higher current way go other considerations Gen 172 Model Aviation FOUR CYCLE ENGINE MOUNTS NEW IUSY PEOPLE KITS CITADRIA STINSON L5 9 NAZLIN 50L 16 INCH ALL BALSA DELUXE PRE-FAB PROFILE FLYING MODELS $695 RUBBER POWER LOG $150 4024636 PECk hPPIar 1 4098675 W BOX 2498 -MA LA MESA CA 92041 Send check money order Con9emers Gold 150 Oft St Hardianburn VA 22801 erally its much harder handle higher current higher voltage may remember discussion about cur rent multiplied itself calculation power losses such wiring motor brushes armature winding resis tance system efficiency suffers more current rises meant confuse rather point out variety con siderations especially serious modeler after last word what can accomplished readers just starting out feel uncomfortable finer points should means go easier route Pick system easy charge less costly go after fun youve tasted success need top what have just done go back reread senes Part 8 Rule Thumb offered guideline power needed cruise want expand bit word may have given wrong impression Cruise has certain comfortable feel ing associated just cruisin along What meant power given Rule Thumb realis tically motor input power needed just barely maintain air space between model terra firmawith some body English thrown good measure can assure know what meantthat ol bend-thestick-back feeling just didnt say cor rectly Anyway power needed put ball park clearly too useful Twice value gets very fly able airplane almost time make bit easier everyone Ive come up graph shows same thing design example Part 9only lot subject power some words about variable power con trols An electronic throttle very nice feature worthwhile have excess power margin other words plane flies rather unim pressively full power pro portional control wouldnt worth having However planes ample power feature can add great deal pleasure flying something left control can some gratifying maneu vers ease just right amount power thing correct landing ap proaches spot landings can become rou tine Slow quiet shoulder-height flybys become awesomeand quite safe because Im talking about some roaring bomb could permanently part hair Finally back Part 2 erroneously wrote prop adapters small motors use hard-to-get 5-40 screws Oops use hard-to-get 6-40 screws ending know must some doubt about series ever ending since has continued grow beyond earlier nouncements really ending follow-up plans mill Spectra construction article coming up will writing continuing column titled RC Electrics intent will offer how-to information monthly basisand some news views too mind Id welcome input information photos interested readers have say CUSTOM TUNED ENGINES COMPETITION ACCESSORIES SPECIALISTS IN CUSTOM COX TD & REED ENGINES STD & R/C CUSTOM PARTS FOR ALL COX ENGINES COMPLETE INVENTORY OF INDIVIDUAL STOCK PARTS FOR ALL CURRENT TD & MEDALLION ENGINES MANY NEW PARTS FOR DiSCONTINUED COX ENGINES HARD CHROMING OTHER COMPETITION ACCESSORIES IGNITION ENGINE SUPPLiES ETC FOR DETAILED BROCHURE SEND T5* TO KUSTOM KRAFTSMANSHIP P0 BOX 2699 LAGUNA HILLS CA 92654 TELEPHONE 014 830-5162 up front cant promise offerings would printed Ill best everyone addition regular column still intend have occasional feature covering some Electric topic too long column formatsort series supplement Good Editor very flexible column format significantly shorter arti cles such can readily see looking various columns issue Anyway can expect continuing Electric coverage variety length particulars turns out another suggested/requested things incoming mail wasyou guessed ita regular column MA Any comments questions series may sent author SASE Bob Kopski 25 West End Dr Lansdale PA 19446 Meanwhile sincere Thank staying series may Electric Elation yours PRODUCTS FOR THE DI$CERNING MODELER Complete Line Exhaust Systems * Tuned Pipes Muffled Tuned Pipes Headers Venturi Mufflers Expansion Mufflers copter Ball Mufflers ialized Exhaust Systems Unsurpss W..Ah nc June 1984 173 J-5s EXCITING NEW GIANT oard Tunneihull Kit clw fiberglass cowl Complete kit 2 hp outboard motor J5 elers ChoIce GMP EPOXIES High Quality Model Construction Jr Kwik Set 6 Minute5 oz * 550 Kwik Set6 MinutelOoz$ 995 Giant wik Set6 Minutel6oz $1295 Half Fast 10 MinutelOoz* 850 GMP AIRCRAFT INSTRUMENTS 80in3116114316112$ 149 40 3/4 inch$ 149 EASY OFF PULLER proper tool removing drive washers flywheels$ 795 Gas Model Products 8773 Russet DR Cinclauatl 0H45239 f513J 385-7398 Emtstwddsrmdsr&wt PutqSAHid$iSO
Edition: Model Aviation - 1984/06
Page Numbers: 78, 79, 80, 82, 171, 172, 173
I Kopski wrap-up author talks about mail received past months gives look future Electric flying covers some over sights omissions previous partsand Part 10conclu sion its really beginning CONCLUSION misnomer word does describe final part series series hardly last word Electrics means about Electrics quite accurate title either can blame editor However hope purpose has fulfilledto share enough expe riences assure first time con tinuing success Electrics under standing installment will attempt review high points series catch up some loose ends respond some mostoften-raised points mail Ive re ceived written Part 7 March issue just appeared obviously has yet no reader feedback Parts 8 9 Review series has appeared con tinuously since September 1983 issue covering everything what Electric to accomplish own flight objec tives Part 1 back September 1983 sales pitch sorts case youve forgotten what Electric good can dig out issue reminder youre still reading series Since Electric new folks general lack familiarity electric motors Part 2 delved sub ject intended help everyone feel ease new prop turners rest series followed introductions out way Part 3 really got series going November 1983 issue relation ship electrical power motors propellers demonstrated saw motors discussed rather similar performance particular saw much difference electri cal input power required turn given prop specific rpm among variety un named motors beyond im portantly saw very dramatic effect propeller size power drain batterythe Electric models fuel tank lessons important planning own Electric undertaking Part 4 got heavily mostoften-misunderstood areas battery part surveyed battery size what means saw size battery weight amount available power related Much said about charging common methods describedincluding favorite conservative charge very safe con78 Model Aviation Left Tracy Keneagy helps show off Ellis Grumers Astro Porterfield model weighs 80 oz wing loading 168 ozIsq ft Power Astro 15 belt drive reducer swings 13-8 wood prop Energy storage 16 cells 55 Ah capacity Author says Porterfield has seen flies very well Right Tom Greets Gentle Lady gets off another flight typically 12 15-mm range weighs 41 oz powered Leisure LT-50 motor 31 gearing swing 9-5 prop Energy provided six 12 Ah Ni-Cd cells venient technique Finally some sugges tions concerning battery installation pre cautions cooling offered So ended 1983 new year brought Parts 5 6 January February issues subject installations requiring two issues cover Looking back topic prob ably out placethe result seemingly continuing extension series proper foresight needed get things right place subject might have better placed after covering what make installation Anyway Parts 5 6 looked motor mounting battery mount ing radio mounting parameter extreme importance successful Electric flying introduced weight Other sub jects basic importance covered switches connectors fuses wiring speed controls prop stops etc Having just covered lot how-to stuff probably found going lighter March issue Part 7 showed graphically what kind flight performance could expected four typical Electric appli cations four models described great detail Data hundreds flights offered pictorial proof Electrics can fly very well indeed saw 5 mm stay stick aerobatics 15 mm Old-Timer laziness routinely possible Part 7 favorite stands solid data base cant argued April MA brought Part 8s shower suggestions sound Electric planning construction first time very grave importance weight quan titatively depicted rules thumb what meant Since its easy come up flimsy lightweight construction sug gestions building strong lightweight models offered Both relative scar city suitable kits growing number magazine plans Electrics noted entire series rapidly came together Part 9 Included extensive tabu lation large variety motor prop battery combinationsand associated operating power levels part taken earlier installments key let know ahead time what would fly well True nowhere cookbook what Electric stuff goes what plane reason no plot flying weight electrical input power static number Electrics author has built flown over years various models wide variation wing loading shown four ranges compare examples guidelines given throughout series will see used least twice cruise power level Several hotter ships much power indicated estimated average power during battery run-down peak burst just after charging Shown also approxi mate motor size ranges most-used motors falling 05 075 range Use graph and/or previous rules thumb relate power systems tabulated Part 9 kind model performance would like obtain Thousands flights went makeup graph models part flew just great Some very same models described much detail earlier series June 1984 79 Another Carl Goldberg Gentle Lady electrified Keith Grote Keith uses Mabuchi 550 SP motor eight Mabuchi AC cells 7-6 prop 44 oz 12-mm flights typical 300 MOTOR POWER INPUT & WEIGHT OF VARIOUS PERSONAL ELECTRICS PARAMETER IS WING LOADING IN OZ/SQFTV PARAMETER LEGEND 2508012____ ____ 2 15 15 18 200-18 v22_____ 4N iso _Ok xIS -A 0 o4 100- 075 A05 U 0 50035 02 0 0 0 10 20 30 40 50 60 70 80 90 100 MODEL WEIGHT ombination can guaranteed cause can easily make anything fly allowing model become unreason ably heavy Better cookbook however virtually unlimited number possible planes just waiting culled out tabulations earlier rules thumb have some simple arithmeticjust like example shown reasonably good building job rest piece cake resulting model should great flier examples Some may still feeling uncertain previous stallments should help assure Electric success key piece information may still obscure much plane self will weigh Part 7 detailed sev eral planes component weights doesnt cover possibilities Actu ally may never have paid much atten tion own building techniques corresponding weights prob ably dont have experienced feel examples Part 7 should help see what planes various sizes can made weigh fly Perhaps chosen design will fall close enough size examples can check construction suggestions Part 8 study various magazine plans other Electrics built and/or drop line see variable can control model weight because almost entirely dependent construc tion materials use Weights motor radio components relatively fixed Thus degree success satisfaction often depend entirely light though durable able make plane fact will go far say almost suitable design power system combination will fly well 4/you dont build model too heavy previously noted kits de signed glow engines Sailplanes suited Electric because struc tural weight kit designs okay structural modifications Some exam ples pictured models flown past KRC Electric Fly events good performers However dont know what particular modifications corporated main point planes can made successful Electrics youre faced impossible Again think light strong Study de sign examples Part 9 apply whats offered throughout series Electric Elation yours mailbag random order So far have received approximately 150 letters maximum mail flow letter day about five weeks late 1983 responded except few required no answerthose writer merely fered commentalways favorable Actu ally few didnt answer because some other rather important notes collectively disap peared day never found 80 Model Aviation think yours might have please write againand forgive same time Some readers wrote once particular wrote seven times Some didnt write called instead most-often-asked question What motor should use such such plane specific question tried give specific answer ingredient common range answers advice weight Please dont impatient saying over over being overweight can kill youand Electric success aswell planes fly great personally could lot lighter Another often-asked question concerns variable-speed controls gliders Its personal preference otherwise com mon choice use variable throttle glider seems people just want get plane up face real challengeto glide long time Nonetheless feel youd enjoy Electric flying speed control glider means Personally like variable-speed control Scale plan use new sport machine designed compete against glow engine planes club fun-fly events number readers took umbrage Part 3 wherein performance several unnamed motors graphed think folks missed point being made motors very similar measured differences fairly small presenta tion fact intended show its mostly prop motor deter mines power input Neither Part 3 nor other part ever intended Elec tric consumers report So far know arent bad motors used graphic presentation has also used own planes Further cases sample given motor type characterized evaluated-surely insufficient evidence form judgment against product Also Part 3 some folks clearly mis understood some basic prop/battery power relationships Others clearly caught up board Some latter sent additional graphs equa tions Two mamrfacturers quired about data give promised fairly large number letters came folks active modelers years past drifted out hobby Now have renewed interest because Electrics Some readers took time tell what flying let tell variety out designs original kit conversion frequently mentioned Its Drifter Two Power always something 05 075 range received few phone calls want mention two two highly experienced highly regarded Electric fliersJim Zarembski RCM columnist Keith Shaw impressive Electric flier Ive ever seen Continued page 82 Olympic Two built Brian Bailie mew has brother John weighs 5Y2 lb powered pod-mounted Astro 25 16 12 Ah cells carried pods beneath wing Uses 9-6 propeller Wing loading comes about 136 ozisq ft 10-mm flights typical Unarles Hampton tiles Airtronics Olympic 650 Mabuchi 550 motor 8-4 prop eight cells size unknown An excellent flier photos month Herb Dirks Incorporated 322 So Gallatin RdMadison TN 37115 615 868-6811 Mon thru Sat am 500 pm - FUTABA RADIO SALE Because care radio systems prechecked f REPAIR SERVICE FOR proper operation prior shipment HOBBY LOBBYFP-7GK 72FMS125 ist535995$24150 E K LOG CT RO LFP-7GK 72AM5-28Iist$35995$22500 FUTABA FTFP-5GK 72FMS-12a Iist$31995$20100 FP-5GK 72AM5-25Iist$28995sisi 50 HOBBY SHACKFP-4LW/3 S-28servosIist$19995$11500 ROYAL LINEAdd $295 Prepaid Mastercard Visa COD $495Tenn residents add 675% tax 82 Model Aviation Jim Keith both picked up po tential trouble spot Part 5 part illustrated preferred battery installation cooling technique cooling air enters above battery flows through cells exits via holes floor fuselage reported stances depending shape fuselage flight characteristics etc peculiar air pressure imbalance can develop prevent airflow out fuselage bottom solution put reverse airscoop forward air exit holes resulting step cures adverse pressure buildup fuselage bottom may explain Ive battery heating problems 1-3 However trying retain scalelike appearance made air intakes rather small Perhaps heating problem resulted com bination both things know cooling method described works very well other planes far scheme Ive used Id like expand Whenever put new model use very carefully check battery motor heat following first several flightsjust make dam sure no gotchas Further after flights some planes often physical evidence good air flow through battery What could Brush dust Several high-powerspending models also spend brushes resulting dust pictured earlier series stuff follows cooling air stream gets deposited anything paththe battery cells right through air exit holes isnt much brush dust 1-3 its hard brushes Im going try suggestion Thanks Jim Keith Some readers reported being interested series cut out articles kept separately Its too bad maga zine articles have spread out over pages thats has Based reader inputs popular Electrics gliders second-mostmentioned type Old-Timers hope thats because folks think nothing else can successfully done Dont forget Scale Aerobatics Pylon Racing great catch-all sport flying Nobody wrote anything about contest terests clearly supports whats lemed Keystone RC Club Electric Fly events far people just want get something flying electric powered pursue simple fun figure sooner later satisfaction success become routine fun will begin mean com petition number comments received la menting seemingly short supply basic Electric information thus endearing series readers default also took note widespread lack dealer interest knowledge Elec trics Several readers requested additional assorted topics covered series Continued page 171 LLL 13311 Beach Ave na Del Rey 1S 1-6242 SALESI RADIO SYSTEMS FUTABA ROYAL ACCESSORIES FOR MOST RADIOSI trics/Kopski Continued page 82 example reader wanted coverage air foils Electrics Others requested series made book Still others wrote wanting buy some models pictured Its very difficult cover everything dont know what means far airfoils go good airfoil glow engine plane its almost certainly good wing section Electric assuming plane also appropriate book has discussedthe outcome certain dont have planes sale does occur theres usually someone whos waiting Some readers asked about suppliers Electric goodies could develop list always chance Id inadvertently miss someone Id want have explain away Besides can al ways thumb through maga zines check ads Catalogs price lists available suppliers usually nominal handling mailing fee Its few cents well spent memorable letter came 14-year-old Tracy Reno wanted know about electric-powered ducted fans Personally have no relevant experience could tell what hoped likely successful truly regret having let down Its likely Ill forget Very sorry Tracy new product Part 4 batteries described two commonly used cell capacities 055 Ah 12 Ah noted latter larger cell size rapidly growing popu larity Since writing new cell size has become available Its 08 Ah capacity available both Astro Leisure have seven-cell battery its weight 9 oz can see individual cells about 13 oz Now lets some arithmetic have stated cell ca pacity weight closely related cells should weigh about 08/12 times weight 12 Ah cell larger cells weigh about 2 oz Both Sanyo Guess what 08/12 x 2 Hows being close Remember theres no magic cant get something nothing havent chance use new pack yet plan Remember south eastern Pennsylvania has four-season year dead winter written should view size option component ever-increasing number Electric parts supplies more stuff use more opportunity Electric flying choices success satisfaction SEAM Society Electric Air craft Modelers new fairly recent founding What really new about SEAM its recent recognition AMA Special Interest Group action places SEAM very important position guiding force matters Electricincluding such things competition rules team selec tion records safety etc Such AMA recog nition assumes SEAM unified voice interested Electrics youve come far series youre clearly interested Electrics go step further drop line Society Electric Aircraft Modelers 11632 Flamingo Dr Garden Grove CA 92644 Ask latest info application member ship Ten bucks adds name grow ing voice gets regular newsletter way SEAM organized district like AMA district has SEAM director Im director District 3 future What likely future Electrics will growth popularity feel sure pretty safe conclusion part no other reason fact Electrics quietand coming more necessary more places course Electrics also convenient quite workable applicable very wide range modeling interests etc Most kind flying fun future also will see introduction refinement Electric classes orga nized competition wonder readers remember knew June 1984 171 4 CYCLE POWEHeu au wINGSPAN SEND $100 FOR COMPLETE CATALOG OF FINE KITS RIC SCALE PLANS Curtlss Hawk P4-E 60 gee 55W eq I. plum$3495 Aeroacs Model K-1937 51 gee $1995 Pipe Super Cub CnaIer PA-Il 51 gem. $1995 PIperPscerPA-2e 59 ge V kde$2995 Piper TiE-Pacer PA-Il 89 gem Scale$2995 DH-5LeopardMoth111s1eaAkuh$1995 DH-80APussMoth111gee.AScd$1995 Sphmks Akroanaster 60 gem 1/5 Seal$1495 Send Self-Addressed Stamped Envelope Complete List HOBBY CAPITOL RIC 46 N Oak St. Ventura CA 93001 Ikon NWST PO Box 566 Auburn WA 98071 206 941-8248 HIgh tensile aluminum alloy Preclslon machIned polished Hardened socket cap screws Included DRILLED AND TAPPED FOR No 31658 ENYA 35-40895 No 31984 ENVA 601295 No 31995 ENYA 901296 No 31452 HP VT 21750 No 31644 HP VT 49896 No 31654 MAX FS 40896 No 31964 MAX FS 60-75-901295 No 32175 MAX FS 1201996 No 31463 SAITO FA 30750 No 31474 SAITO FA 40-45896 No 32196 SAITO FA 1201996 AT MOST HOBBY SHOPS OR ORDER DIRECT Send 100 12 page illustrated catalog L Consumers Guide RC Aircraft Products 242 Pages Hundreds New Products Photos & Descriptions over 2000 RC Aircraft Products fered 176 companies Outstanding Value Only $495 plus shipping* Send $660 Includes UPS ft handling Foreign ordars send $786 US surface mail sios us air mail Catalogs companies would cost over 10 times price outstanding reference book product lines nearly major man ufacturer distributor importer well unique interesting products small companies seldom advertise national modeling magazines July 83 Model Aviation See Local Dealer Order Direct SAME once Rudder Only RC event thing has start somewhere good things grow get better stand Electric threshold now As Electric products dont see significant changes present day peifor mance levels long time say cause major breakthroughs motor efficiencymore output less less inputare improbable Most motors already quite good Ni-Cds likely remain pretty much now know know no other battery technology horizon will soon re place have simple way looking Lets pretend some really nifty magical battery out packs kinds capacity virtually no space weight Until such battery makes its way electric toothbrushes cordless shavers grass trimmers toys etc such wishbook battery would remain too costly ap plication Please dont misunderstand am saying new products wont con tinuing along However am saying feel performance now have available modeling use about level well seeing several years Thats opinion folks Things Id like see think no dramatic breakthroughs close hand expect see continuing refinement improvement contemporary technology too very safe position assume because thats what has hap pening during past decade con tinuing right now What Im looking new little things will make present products appealinglonger lasting easier use better buys readily available whatever example Id like see armature shafts harder bend Id like see sophisticated chargers accommodate varied battery configurations Id like see motors carefully configured flow-through cooling ducts directed brush-commutator area Id like see kits Electric Id like see versa tile motors design ie such fea tures removable flux rings optional armature windings optimum designs Pro-Built Price Magic DragonEngine 25 cu Wing Span 55 TrainerRadio 3 4 Channels balsa coostroctlee Reedy lbs sand mid cover Control sur faces hisgad Hake Inedleg gem 5/32 nnaa gew otrat Fittad canopy lastractica booklet end dwere Included Pre-Built Price $12496 Engine 40 Cu F ire FoxWing Span 52h Radio 4 Channels balsa cesstroctiea Reody floe sand mid cover Control so. faces hinged Has bolt-es wing end limbo lending gem ASS wheel pasts mounted atelt Installed Fitted cempy leotroctina booklet nod lssrdwnre Included 6 Other ModelsSend Free Brochure 990 16th Street Seed checker M0 Palm HarborCredit Cords occeptod RO $850 UPS FL 33583shIpping hi 350 PSI cain ECHRIC 181317954560FLroooddS%tas DEAL ER INQUIRIES INWTED can made serious modelers time kinds features would find way routine use skilled beginner alike recognize some asking lot five years ago never would have expected see what now market Keep mind have something chicken-and-egg situation Suppliers must have sales products now have make better things future items now have work friends pretty darn good less accept above can see waiting probably wont make major difference go now Read series again necessary think about what youd like fly figure out what will take Make Electric Elation yours Some oversights reflecting series clear could have thorough few areas recent example Part 7 Playboy detailed table vital statistics gave com pleted empty fuselage weight 3 oz reader took task weight correct should have noted landing gear modified gear could attached after covering rather being built-in per plan Theres difficult area need some expansion have seen large vari ety possible electric power options several combinations motors props batteries could produce about same de sired power level may difficult make choice Certainly price availability could factors another factor worth considering battery pack tabulations Part 9 clear about same given power level can achieved relatively higher voltages lower currentsand other way around too Motor prop combinations using higher voltages require cells means higher costs turns out vari ous cell sizes capacities cost about same Thus its possible purchase exactly same energy storage variety prices might now conclude lower voltage higher current way go other considerations Gen 172 Model Aviation FOUR CYCLE ENGINE MOUNTS NEW IUSY PEOPLE KITS CITADRIA STINSON L5 9 NAZLIN 50L 16 INCH ALL BALSA DELUXE PRE-FAB PROFILE FLYING MODELS $695 RUBBER POWER LOG $150 4024636 PECk hPPIar 1 4098675 W BOX 2498 -MA LA MESA CA 92041 Send check money order Con9emers Gold 150 Oft St Hardianburn VA 22801 erally its much harder handle higher current higher voltage may remember discussion about cur rent multiplied itself calculation power losses such wiring motor brushes armature winding resis tance system efficiency suffers more current rises meant confuse rather point out variety con siderations especially serious modeler after last word what can accomplished readers just starting out feel uncomfortable finer points should means go easier route Pick system easy charge less costly go after fun youve tasted success need top what have just done go back reread senes Part 8 Rule Thumb offered guideline power needed cruise want expand bit word may have given wrong impression Cruise has certain comfortable feel ing associated just cruisin along What meant power given Rule Thumb realis tically motor input power needed just barely maintain air space between model terra firmawith some body English thrown good measure can assure know what meantthat ol bend-thestick-back feeling just didnt say cor rectly Anyway power needed put ball park clearly too useful Twice value gets very fly able airplane almost time make bit easier everyone Ive come up graph shows same thing design example Part 9only lot subject power some words about variable power con trols An electronic throttle very nice feature worthwhile have excess power margin other words plane flies rather unim pressively full power pro portional control wouldnt worth having However planes ample power feature can add great deal pleasure flying something left control can some gratifying maneu vers ease just right amount power thing correct landing ap proaches spot landings can become rou tine Slow quiet shoulder-height flybys become awesomeand quite safe because Im talking about some roaring bomb could permanently part hair Finally back Part 2 erroneously wrote prop adapters small motors use hard-to-get 5-40 screws Oops use hard-to-get 6-40 screws ending know must some doubt about series ever ending since has continued grow beyond earlier nouncements really ending follow-up plans mill Spectra construction article coming up will writing continuing column titled RC Electrics intent will offer how-to information monthly basisand some news views too mind Id welcome input information photos interested readers have say CUSTOM TUNED ENGINES COMPETITION ACCESSORIES SPECIALISTS IN CUSTOM COX TD & REED ENGINES STD & R/C CUSTOM PARTS FOR ALL COX ENGINES COMPLETE INVENTORY OF INDIVIDUAL STOCK PARTS FOR ALL CURRENT TD & MEDALLION ENGINES MANY NEW PARTS FOR DiSCONTINUED COX ENGINES HARD CHROMING OTHER COMPETITION ACCESSORIES IGNITION ENGINE SUPPLiES ETC FOR DETAILED BROCHURE SEND T5* TO KUSTOM KRAFTSMANSHIP P0 BOX 2699 LAGUNA HILLS CA 92654 TELEPHONE 014 830-5162 up front cant promise offerings would printed Ill best everyone addition regular column still intend have occasional feature covering some Electric topic too long column formatsort series supplement Good Editor very flexible column format significantly shorter arti cles such can readily see looking various columns issue Anyway can expect continuing Electric coverage variety length particulars turns out another suggested/requested things incoming mail wasyou guessed ita regular column MA Any comments questions series may sent author SASE Bob Kopski 25 West End Dr Lansdale PA 19446 Meanwhile sincere Thank staying series may Electric Elation yours PRODUCTS FOR THE DI$CERNING MODELER Complete Line Exhaust Systems * Tuned Pipes Muffled Tuned Pipes Headers Venturi Mufflers Expansion Mufflers copter Ball Mufflers ialized Exhaust Systems Unsurpss W..Ah nc June 1984 173 J-5s EXCITING NEW GIANT oard Tunneihull Kit clw fiberglass cowl Complete kit 2 hp outboard motor J5 elers ChoIce GMP EPOXIES High Quality Model Construction Jr Kwik Set 6 Minute5 oz * 550 Kwik Set6 MinutelOoz$ 995 Giant wik Set6 Minutel6oz $1295 Half Fast 10 MinutelOoz* 850 GMP AIRCRAFT INSTRUMENTS 80in3116114316112$ 149 40 3/4 inch$ 149 EASY OFF PULLER proper tool removing drive washers flywheels$ 795 Gas Model Products 8773 Russet DR Cinclauatl 0H45239 f513J 385-7398 Emtstwddsrmdsr&wt PutqSAHid$iSO
Edition: Model Aviation - 1984/06
Page Numbers: 78, 79, 80, 82, 171, 172, 173
I Kopski wrap-up author talks about mail received past months gives look future Electric flying covers some over sights omissions previous partsand Part 10conclu sion its really beginning CONCLUSION misnomer word does describe final part series series hardly last word Electrics means about Electrics quite accurate title either can blame editor However hope purpose has fulfilledto share enough expe riences assure first time con tinuing success Electrics under standing installment will attempt review high points series catch up some loose ends respond some mostoften-raised points mail Ive re ceived written Part 7 March issue just appeared obviously has yet no reader feedback Parts 8 9 Review series has appeared con tinuously since September 1983 issue covering everything what Electric to accomplish own flight objec tives Part 1 back September 1983 sales pitch sorts case youve forgotten what Electric good can dig out issue reminder youre still reading series Since Electric new folks general lack familiarity electric motors Part 2 delved sub ject intended help everyone feel ease new prop turners rest series followed introductions out way Part 3 really got series going November 1983 issue relation ship electrical power motors propellers demonstrated saw motors discussed rather similar performance particular saw much difference electri cal input power required turn given prop specific rpm among variety un named motors beyond im portantly saw very dramatic effect propeller size power drain batterythe Electric models fuel tank lessons important planning own Electric undertaking Part 4 got heavily mostoften-misunderstood areas battery part surveyed battery size what means saw size battery weight amount available power related Much said about charging common methods describedincluding favorite conservative charge very safe con78 Model Aviation Left Tracy Keneagy helps show off Ellis Grumers Astro Porterfield model weighs 80 oz wing loading 168 ozIsq ft Power Astro 15 belt drive reducer swings 13-8 wood prop Energy storage 16 cells 55 Ah capacity Author says Porterfield has seen flies very well Right Tom Greets Gentle Lady gets off another flight typically 12 15-mm range weighs 41 oz powered Leisure LT-50 motor 31 gearing swing 9-5 prop Energy provided six 12 Ah Ni-Cd cells venient technique Finally some sugges tions concerning battery installation pre cautions cooling offered So ended 1983 new year brought Parts 5 6 January February issues subject installations requiring two issues cover Looking back topic prob ably out placethe result seemingly continuing extension series proper foresight needed get things right place subject might have better placed after covering what make installation Anyway Parts 5 6 looked motor mounting battery mount ing radio mounting parameter extreme importance successful Electric flying introduced weight Other sub jects basic importance covered switches connectors fuses wiring speed controls prop stops etc Having just covered lot how-to stuff probably found going lighter March issue Part 7 showed graphically what kind flight performance could expected four typical Electric appli cations four models described great detail Data hundreds flights offered pictorial proof Electrics can fly very well indeed saw 5 mm stay stick aerobatics 15 mm Old-Timer laziness routinely possible Part 7 favorite stands solid data base cant argued April MA brought Part 8s shower suggestions sound Electric planning construction first time very grave importance weight quan titatively depicted rules thumb what meant Since its easy come up flimsy lightweight construction sug gestions building strong lightweight models offered Both relative scar city suitable kits growing number magazine plans Electrics noted entire series rapidly came together Part 9 Included extensive tabu lation large variety motor prop battery combinationsand associated operating power levels part taken earlier installments key let know ahead time what would fly well True nowhere cookbook what Electric stuff goes what plane reason no plot flying weight electrical input power static number Electrics author has built flown over years various models wide variation wing loading shown four ranges compare examples guidelines given throughout series will see used least twice cruise power level Several hotter ships much power indicated estimated average power during battery run-down peak burst just after charging Shown also approxi mate motor size ranges most-used motors falling 05 075 range Use graph and/or previous rules thumb relate power systems tabulated Part 9 kind model performance would like obtain Thousands flights went makeup graph models part flew just great Some very same models described much detail earlier series June 1984 79 Another Carl Goldberg Gentle Lady electrified Keith Grote Keith uses Mabuchi 550 SP motor eight Mabuchi AC cells 7-6 prop 44 oz 12-mm flights typical 300 MOTOR POWER INPUT & WEIGHT OF VARIOUS PERSONAL ELECTRICS PARAMETER IS WING LOADING IN OZ/SQFTV PARAMETER LEGEND 2508012____ ____ 2 15 15 18 200-18 v22_____ 4N iso _Ok xIS -A 0 o4 100- 075 A05 U 0 50035 02 0 0 0 10 20 30 40 50 60 70 80 90 100 MODEL WEIGHT ombination can guaranteed cause can easily make anything fly allowing model become unreason ably heavy Better cookbook however virtually unlimited number possible planes just waiting culled out tabulations earlier rules thumb have some simple arithmeticjust like example shown reasonably good building job rest piece cake resulting model should great flier examples Some may still feeling uncertain previous stallments should help assure Electric success key piece information may still obscure much plane self will weigh Part 7 detailed sev eral planes component weights doesnt cover possibilities Actu ally may never have paid much atten tion own building techniques corresponding weights prob ably dont have experienced feel examples Part 7 should help see what planes various sizes can made weigh fly Perhaps chosen design will fall close enough size examples can check construction suggestions Part 8 study various magazine plans other Electrics built and/or drop line see variable can control model weight because almost entirely dependent construc tion materials use Weights motor radio components relatively fixed Thus degree success satisfaction often depend entirely light though durable able make plane fact will go far say almost suitable design power system combination will fly well 4/you dont build model too heavy previously noted kits de signed glow engines Sailplanes suited Electric because struc tural weight kit designs okay structural modifications Some exam ples pictured models flown past KRC Electric Fly events good performers However dont know what particular modifications corporated main point planes can made successful Electrics youre faced impossible Again think light strong Study de sign examples Part 9 apply whats offered throughout series Electric Elation yours mailbag random order So far have received approximately 150 letters maximum mail flow letter day about five weeks late 1983 responded except few required no answerthose writer merely fered commentalways favorable Actu ally few didnt answer because some other rather important notes collectively disap peared day never found 80 Model Aviation think yours might have please write againand forgive same time Some readers wrote once particular wrote seven times Some didnt write called instead most-often-asked question What motor should use such such plane specific question tried give specific answer ingredient common range answers advice weight Please dont impatient saying over over being overweight can kill youand Electric success aswell planes fly great personally could lot lighter Another often-asked question concerns variable-speed controls gliders Its personal preference otherwise com mon choice use variable throttle glider seems people just want get plane up face real challengeto glide long time Nonetheless feel youd enjoy Electric flying speed control glider means Personally like variable-speed control Scale plan use new sport machine designed compete against glow engine planes club fun-fly events number readers took umbrage Part 3 wherein performance several unnamed motors graphed think folks missed point being made motors very similar measured differences fairly small presenta tion fact intended show its mostly prop motor deter mines power input Neither Part 3 nor other part ever intended Elec tric consumers report So far know arent bad motors used graphic presentation has also used own planes Further cases sample given motor type characterized evaluated-surely insufficient evidence form judgment against product Also Part 3 some folks clearly mis understood some basic prop/battery power relationships Others clearly caught up board Some latter sent additional graphs equa tions Two mamrfacturers quired about data give promised fairly large number letters came folks active modelers years past drifted out hobby Now have renewed interest because Electrics Some readers took time tell what flying let tell variety out designs original kit conversion frequently mentioned Its Drifter Two Power always something 05 075 range received few phone calls want mention two two highly experienced highly regarded Electric fliersJim Zarembski RCM columnist Keith Shaw impressive Electric flier Ive ever seen Continued page 82 Olympic Two built Brian Bailie mew has brother John weighs 5Y2 lb powered pod-mounted Astro 25 16 12 Ah cells carried pods beneath wing Uses 9-6 propeller Wing loading comes about 136 ozisq ft 10-mm flights typical Unarles Hampton tiles Airtronics Olympic 650 Mabuchi 550 motor 8-4 prop eight cells size unknown An excellent flier photos month Herb Dirks Incorporated 322 So Gallatin RdMadison TN 37115 615 868-6811 Mon thru Sat am 500 pm - FUTABA RADIO SALE Because care radio systems prechecked f REPAIR SERVICE FOR proper operation prior shipment HOBBY LOBBYFP-7GK 72FMS125 ist535995$24150 E K LOG CT RO LFP-7GK 72AM5-28Iist$35995$22500 FUTABA FTFP-5GK 72FMS-12a Iist$31995$20100 FP-5GK 72AM5-25Iist$28995sisi 50 HOBBY SHACKFP-4LW/3 S-28servosIist$19995$11500 ROYAL LINEAdd $295 Prepaid Mastercard Visa COD $495Tenn residents add 675% tax 82 Model Aviation Jim Keith both picked up po tential trouble spot Part 5 part illustrated preferred battery installation cooling technique cooling air enters above battery flows through cells exits via holes floor fuselage reported stances depending shape fuselage flight characteristics etc peculiar air pressure imbalance can develop prevent airflow out fuselage bottom solution put reverse airscoop forward air exit holes resulting step cures adverse pressure buildup fuselage bottom may explain Ive battery heating problems 1-3 However trying retain scalelike appearance made air intakes rather small Perhaps heating problem resulted com bination both things know cooling method described works very well other planes far scheme Ive used Id like expand Whenever put new model use very carefully check battery motor heat following first several flightsjust make dam sure no gotchas Further after flights some planes often physical evidence good air flow through battery What could Brush dust Several high-powerspending models also spend brushes resulting dust pictured earlier series stuff follows cooling air stream gets deposited anything paththe battery cells right through air exit holes isnt much brush dust 1-3 its hard brushes Im going try suggestion Thanks Jim Keith Some readers reported being interested series cut out articles kept separately Its too bad maga zine articles have spread out over pages thats has Based reader inputs popular Electrics gliders second-mostmentioned type Old-Timers hope thats because folks think nothing else can successfully done Dont forget Scale Aerobatics Pylon Racing great catch-all sport flying Nobody wrote anything about contest terests clearly supports whats lemed Keystone RC Club Electric Fly events far people just want get something flying electric powered pursue simple fun figure sooner later satisfaction success become routine fun will begin mean com petition number comments received la menting seemingly short supply basic Electric information thus endearing series readers default also took note widespread lack dealer interest knowledge Elec trics Several readers requested additional assorted topics covered series Continued page 171 LLL 13311 Beach Ave na Del Rey 1S 1-6242 SALESI RADIO SYSTEMS FUTABA ROYAL ACCESSORIES FOR MOST RADIOSI trics/Kopski Continued page 82 example reader wanted coverage air foils Electrics Others requested series made book Still others wrote wanting buy some models pictured Its very difficult cover everything dont know what means far airfoils go good airfoil glow engine plane its almost certainly good wing section Electric assuming plane also appropriate book has discussedthe outcome certain dont have planes sale does occur theres usually someone whos waiting Some readers asked about suppliers Electric goodies could develop list always chance Id inadvertently miss someone Id want have explain away Besides can al ways thumb through maga zines check ads Catalogs price lists available suppliers usually nominal handling mailing fee Its few cents well spent memorable letter came 14-year-old Tracy Reno wanted know about electric-powered ducted fans Personally have no relevant experience could tell what hoped likely successful truly regret having let down Its likely Ill forget Very sorry Tracy new product Part 4 batteries described two commonly used cell capacities 055 Ah 12 Ah noted latter larger cell size rapidly growing popu larity Since writing new cell size has become available Its 08 Ah capacity available both Astro Leisure have seven-cell battery its weight 9 oz can see individual cells about 13 oz Now lets some arithmetic have stated cell ca pacity weight closely related cells should weigh about 08/12 times weight 12 Ah cell larger cells weigh about 2 oz Both Sanyo Guess what 08/12 x 2 Hows being close Remember theres no magic cant get something nothing havent chance use new pack yet plan Remember south eastern Pennsylvania has four-season year dead winter written should view size option component ever-increasing number Electric parts supplies more stuff use more opportunity Electric flying choices success satisfaction SEAM Society Electric Air craft Modelers new fairly recent founding What really new about SEAM its recent recognition AMA Special Interest Group action places SEAM very important position guiding force matters Electricincluding such things competition rules team selec tion records safety etc Such AMA recog nition assumes SEAM unified voice interested Electrics youve come far series youre clearly interested Electrics go step further drop line Society Electric Aircraft Modelers 11632 Flamingo Dr Garden Grove CA 92644 Ask latest info application member ship Ten bucks adds name grow ing voice gets regular newsletter way SEAM organized district like AMA district has SEAM director Im director District 3 future What likely future Electrics will growth popularity feel sure pretty safe conclusion part no other reason fact Electrics quietand coming more necessary more places course Electrics also convenient quite workable applicable very wide range modeling interests etc Most kind flying fun future also will see introduction refinement Electric classes orga nized competition wonder readers remember knew June 1984 171 4 CYCLE POWEHeu au wINGSPAN SEND $100 FOR COMPLETE CATALOG OF FINE KITS RIC SCALE PLANS Curtlss Hawk P4-E 60 gee 55W eq I. plum$3495 Aeroacs Model K-1937 51 gee $1995 Pipe Super Cub CnaIer PA-Il 51 gem. $1995 PIperPscerPA-2e 59 ge V kde$2995 Piper TiE-Pacer PA-Il 89 gem Scale$2995 DH-5LeopardMoth111s1eaAkuh$1995 DH-80APussMoth111gee.AScd$1995 Sphmks Akroanaster 60 gem 1/5 Seal$1495 Send Self-Addressed Stamped Envelope Complete List HOBBY CAPITOL RIC 46 N Oak St. Ventura CA 93001 Ikon NWST PO Box 566 Auburn WA 98071 206 941-8248 HIgh tensile aluminum alloy Preclslon machIned polished Hardened socket cap screws Included DRILLED AND TAPPED FOR No 31658 ENYA 35-40895 No 31984 ENVA 601295 No 31995 ENYA 901296 No 31452 HP VT 21750 No 31644 HP VT 49896 No 31654 MAX FS 40896 No 31964 MAX FS 60-75-901295 No 32175 MAX FS 1201996 No 31463 SAITO FA 30750 No 31474 SAITO FA 40-45896 No 32196 SAITO FA 1201996 AT MOST HOBBY SHOPS OR ORDER DIRECT Send 100 12 page illustrated catalog L Consumers Guide RC Aircraft Products 242 Pages Hundreds New Products Photos & Descriptions over 2000 RC Aircraft Products fered 176 companies Outstanding Value Only $495 plus shipping* Send $660 Includes UPS ft handling Foreign ordars send $786 US surface mail sios us air mail Catalogs companies would cost over 10 times price outstanding reference book product lines nearly major man ufacturer distributor importer well unique interesting products small companies seldom advertise national modeling magazines July 83 Model Aviation See Local Dealer Order Direct SAME once Rudder Only RC event thing has start somewhere good things grow get better stand Electric threshold now As Electric products dont see significant changes present day peifor mance levels long time say cause major breakthroughs motor efficiencymore output less less inputare improbable Most motors already quite good Ni-Cds likely remain pretty much now know know no other battery technology horizon will soon re place have simple way looking Lets pretend some really nifty magical battery out packs kinds capacity virtually no space weight Until such battery makes its way electric toothbrushes cordless shavers grass trimmers toys etc such wishbook battery would remain too costly ap plication Please dont misunderstand am saying new products wont con tinuing along However am saying feel performance now have available modeling use about level well seeing several years Thats opinion folks Things Id like see think no dramatic breakthroughs close hand expect see continuing refinement improvement contemporary technology too very safe position assume because thats what has hap pening during past decade con tinuing right now What Im looking new little things will make present products appealinglonger lasting easier use better buys readily available whatever example Id like see armature shafts harder bend Id like see sophisticated chargers accommodate varied battery configurations Id like see motors carefully configured flow-through cooling ducts directed brush-commutator area Id like see kits Electric Id like see versa tile motors design ie such fea tures removable flux rings optional armature windings optimum designs Pro-Built Price Magic DragonEngine 25 cu Wing Span 55 TrainerRadio 3 4 Channels balsa coostroctlee Reedy lbs sand mid cover Control sur faces hisgad Hake Inedleg gem 5/32 nnaa gew otrat Fittad canopy lastractica booklet end dwere Included Pre-Built Price $12496 Engine 40 Cu F ire FoxWing Span 52h Radio 4 Channels balsa cesstroctiea Reody floe sand mid cover Control so. faces hinged Has bolt-es wing end limbo lending gem ASS wheel pasts mounted atelt Installed Fitted cempy leotroctina booklet nod lssrdwnre Included 6 Other ModelsSend Free Brochure 990 16th Street Seed checker M0 Palm HarborCredit Cords occeptod RO $850 UPS FL 33583shIpping hi 350 PSI cain ECHRIC 181317954560FLroooddS%tas DEAL ER INQUIRIES INWTED can made serious modelers time kinds features would find way routine use skilled beginner alike recognize some asking lot five years ago never would have expected see what now market Keep mind have something chicken-and-egg situation Suppliers must have sales products now have make better things future items now have work friends pretty darn good less accept above can see waiting probably wont make major difference go now Read series again necessary think about what youd like fly figure out what will take Make Electric Elation yours Some oversights reflecting series clear could have thorough few areas recent example Part 7 Playboy detailed table vital statistics gave com pleted empty fuselage weight 3 oz reader took task weight correct should have noted landing gear modified gear could attached after covering rather being built-in per plan Theres difficult area need some expansion have seen large vari ety possible electric power options several combinations motors props batteries could produce about same de sired power level may difficult make choice Certainly price availability could factors another factor worth considering battery pack tabulations Part 9 clear about same given power level can achieved relatively higher voltages lower currentsand other way around too Motor prop combinations using higher voltages require cells means higher costs turns out vari ous cell sizes capacities cost about same Thus its possible purchase exactly same energy storage variety prices might now conclude lower voltage higher current way go other considerations Gen 172 Model Aviation FOUR CYCLE ENGINE MOUNTS NEW IUSY PEOPLE KITS CITADRIA STINSON L5 9 NAZLIN 50L 16 INCH ALL BALSA DELUXE PRE-FAB PROFILE FLYING MODELS $695 RUBBER POWER LOG $150 4024636 PECk hPPIar 1 4098675 W BOX 2498 -MA LA MESA CA 92041 Send check money order Con9emers Gold 150 Oft St Hardianburn VA 22801 erally its much harder handle higher current higher voltage may remember discussion about cur rent multiplied itself calculation power losses such wiring motor brushes armature winding resis tance system efficiency suffers more current rises meant confuse rather point out variety con siderations especially serious modeler after last word what can accomplished readers just starting out feel uncomfortable finer points should means go easier route Pick system easy charge less costly go after fun youve tasted success need top what have just done go back reread senes Part 8 Rule Thumb offered guideline power needed cruise want expand bit word may have given wrong impression Cruise has certain comfortable feel ing associated just cruisin along What meant power given Rule Thumb realis tically motor input power needed just barely maintain air space between model terra firmawith some body English thrown good measure can assure know what meantthat ol bend-thestick-back feeling just didnt say cor rectly Anyway power needed put ball park clearly too useful Twice value gets very fly able airplane almost time make bit easier everyone Ive come up graph shows same thing design example Part 9only lot subject power some words about variable power con trols An electronic throttle very nice feature worthwhile have excess power margin other words plane flies rather unim pressively full power pro portional control wouldnt worth having However planes ample power feature can add great deal pleasure flying something left control can some gratifying maneu vers ease just right amount power thing correct landing ap proaches spot landings can become rou tine Slow quiet shoulder-height flybys become awesomeand quite safe because Im talking about some roaring bomb could permanently part hair Finally back Part 2 erroneously wrote prop adapters small motors use hard-to-get 5-40 screws Oops use hard-to-get 6-40 screws ending know must some doubt about series ever ending since has continued grow beyond earlier nouncements really ending follow-up plans mill Spectra construction article coming up will writing continuing column titled RC Electrics intent will offer how-to information monthly basisand some news views too mind Id welcome input information photos interested readers have say CUSTOM TUNED ENGINES COMPETITION ACCESSORIES SPECIALISTS IN CUSTOM COX TD & REED ENGINES STD & R/C CUSTOM PARTS FOR ALL COX ENGINES COMPLETE INVENTORY OF INDIVIDUAL STOCK PARTS FOR ALL CURRENT TD & MEDALLION ENGINES MANY NEW PARTS FOR DiSCONTINUED COX ENGINES HARD CHROMING OTHER COMPETITION ACCESSORIES IGNITION ENGINE SUPPLiES ETC FOR DETAILED BROCHURE SEND T5* TO KUSTOM KRAFTSMANSHIP P0 BOX 2699 LAGUNA HILLS CA 92654 TELEPHONE 014 830-5162 up front cant promise offerings would printed Ill best everyone addition regular column still intend have occasional feature covering some Electric topic too long column formatsort series supplement Good Editor very flexible column format significantly shorter arti cles such can readily see looking various columns issue Anyway can expect continuing Electric coverage variety length particulars turns out another suggested/requested things incoming mail wasyou guessed ita regular column MA Any comments questions series may sent author SASE Bob Kopski 25 West End Dr Lansdale PA 19446 Meanwhile sincere Thank staying series may Electric Elation yours PRODUCTS FOR THE DI$CERNING MODELER Complete Line Exhaust Systems * Tuned Pipes Muffled Tuned Pipes Headers Venturi Mufflers Expansion Mufflers copter Ball Mufflers ialized Exhaust Systems Unsurpss W..Ah nc June 1984 173 J-5s EXCITING NEW GIANT oard Tunneihull Kit clw fiberglass cowl Complete kit 2 hp outboard motor J5 elers ChoIce GMP EPOXIES High Quality Model Construction Jr Kwik Set 6 Minute5 oz * 550 Kwik Set6 MinutelOoz$ 995 Giant wik Set6 Minutel6oz $1295 Half Fast 10 MinutelOoz* 850 GMP AIRCRAFT INSTRUMENTS 80in3116114316112$ 149 40 3/4 inch$ 149 EASY OFF PULLER proper tool removing drive washers flywheels$ 795 Gas Model Products 8773 Russet DR Cinclauatl 0H45239 f513J 385-7398 Emtstwddsrmdsr&wt PutqSAHid$iSO
Edition: Model Aviation - 1984/06
Page Numbers: 78, 79, 80, 82, 171, 172, 173
I Kopski wrap-up author talks about mail received past months gives look future Electric flying covers some over sights omissions previous partsand Part 10conclu sion its really beginning CONCLUSION misnomer word does describe final part series series hardly last word Electrics means about Electrics quite accurate title either can blame editor However hope purpose has fulfilledto share enough expe riences assure first time con tinuing success Electrics under standing installment will attempt review high points series catch up some loose ends respond some mostoften-raised points mail Ive re ceived written Part 7 March issue just appeared obviously has yet no reader feedback Parts 8 9 Review series has appeared con tinuously since September 1983 issue covering everything what Electric to accomplish own flight objec tives Part 1 back September 1983 sales pitch sorts case youve forgotten what Electric good can dig out issue reminder youre still reading series Since Electric new folks general lack familiarity electric motors Part 2 delved sub ject intended help everyone feel ease new prop turners rest series followed introductions out way Part 3 really got series going November 1983 issue relation ship electrical power motors propellers demonstrated saw motors discussed rather similar performance particular saw much difference electri cal input power required turn given prop specific rpm among variety un named motors beyond im portantly saw very dramatic effect propeller size power drain batterythe Electric models fuel tank lessons important planning own Electric undertaking Part 4 got heavily mostoften-misunderstood areas battery part surveyed battery size what means saw size battery weight amount available power related Much said about charging common methods describedincluding favorite conservative charge very safe con78 Model Aviation Left Tracy Keneagy helps show off Ellis Grumers Astro Porterfield model weighs 80 oz wing loading 168 ozIsq ft Power Astro 15 belt drive reducer swings 13-8 wood prop Energy storage 16 cells 55 Ah capacity Author says Porterfield has seen flies very well Right Tom Greets Gentle Lady gets off another flight typically 12 15-mm range weighs 41 oz powered Leisure LT-50 motor 31 gearing swing 9-5 prop Energy provided six 12 Ah Ni-Cd cells venient technique Finally some sugges tions concerning battery installation pre cautions cooling offered So ended 1983 new year brought Parts 5 6 January February issues subject installations requiring two issues cover Looking back topic prob ably out placethe result seemingly continuing extension series proper foresight needed get things right place subject might have better placed after covering what make installation Anyway Parts 5 6 looked motor mounting battery mount ing radio mounting parameter extreme importance successful Electric flying introduced weight Other sub jects basic importance covered switches connectors fuses wiring speed controls prop stops etc Having just covered lot how-to stuff probably found going lighter March issue Part 7 showed graphically what kind flight performance could expected four typical Electric appli cations four models described great detail Data hundreds flights offered pictorial proof Electrics can fly very well indeed saw 5 mm stay stick aerobatics 15 mm Old-Timer laziness routinely possible Part 7 favorite stands solid data base cant argued April MA brought Part 8s shower suggestions sound Electric planning construction first time very grave importance weight quan titatively depicted rules thumb what meant Since its easy come up flimsy lightweight construction sug gestions building strong lightweight models offered Both relative scar city suitable kits growing number magazine plans Electrics noted entire series rapidly came together Part 9 Included extensive tabu lation large variety motor prop battery combinationsand associated operating power levels part taken earlier installments key let know ahead time what would fly well True nowhere cookbook what Electric stuff goes what plane reason no plot flying weight electrical input power static number Electrics author has built flown over years various models wide variation wing loading shown four ranges compare examples guidelines given throughout series will see used least twice cruise power level Several hotter ships much power indicated estimated average power during battery run-down peak burst just after charging Shown also approxi mate motor size ranges most-used motors falling 05 075 range Use graph and/or previous rules thumb relate power systems tabulated Part 9 kind model performance would like obtain Thousands flights went makeup graph models part flew just great Some very same models described much detail earlier series June 1984 79 Another Carl Goldberg Gentle Lady electrified Keith Grote Keith uses Mabuchi 550 SP motor eight Mabuchi AC cells 7-6 prop 44 oz 12-mm flights typical 300 MOTOR POWER INPUT & WEIGHT OF VARIOUS PERSONAL ELECTRICS PARAMETER IS WING LOADING IN OZ/SQFTV PARAMETER LEGEND 2508012____ ____ 2 15 15 18 200-18 v22_____ 4N iso _Ok xIS -A 0 o4 100- 075 A05 U 0 50035 02 0 0 0 10 20 30 40 50 60 70 80 90 100 MODEL WEIGHT ombination can guaranteed cause can easily make anything fly allowing model become unreason ably heavy Better cookbook however virtually unlimited number possible planes just waiting culled out tabulations earlier rules thumb have some simple arithmeticjust like example shown reasonably good building job rest piece cake resulting model should great flier examples Some may still feeling uncertain previous stallments should help assure Electric success key piece information may still obscure much plane self will weigh Part 7 detailed sev eral planes component weights doesnt cover possibilities Actu ally may never have paid much atten tion own building techniques corresponding weights prob ably dont have experienced feel examples Part 7 should help see what planes various sizes can made weigh fly Perhaps chosen design will fall close enough size examples can check construction suggestions Part 8 study various magazine plans other Electrics built and/or drop line see variable can control model weight because almost entirely dependent construc tion materials use Weights motor radio components relatively fixed Thus degree success satisfaction often depend entirely light though durable able make plane fact will go far say almost suitable design power system combination will fly well 4/you dont build model too heavy previously noted kits de signed glow engines Sailplanes suited Electric because struc tural weight kit designs okay structural modifications Some exam ples pictured models flown past KRC Electric Fly events good performers However dont know what particular modifications corporated main point planes can made successful Electrics youre faced impossible Again think light strong Study de sign examples Part 9 apply whats offered throughout series Electric Elation yours mailbag random order So far have received approximately 150 letters maximum mail flow letter day about five weeks late 1983 responded except few required no answerthose writer merely fered commentalways favorable Actu ally few didnt answer because some other rather important notes collectively disap peared day never found 80 Model Aviation think yours might have please write againand forgive same time Some readers wrote once particular wrote seven times Some didnt write called instead most-often-asked question What motor should use such such plane specific question tried give specific answer ingredient common range answers advice weight Please dont impatient saying over over being overweight can kill youand Electric success aswell planes fly great personally could lot lighter Another often-asked question concerns variable-speed controls gliders Its personal preference otherwise com mon choice use variable throttle glider seems people just want get plane up face real challengeto glide long time Nonetheless feel youd enjoy Electric flying speed control glider means Personally like variable-speed control Scale plan use new sport machine designed compete against glow engine planes club fun-fly events number readers took umbrage Part 3 wherein performance several unnamed motors graphed think folks missed point being made motors very similar measured differences fairly small presenta tion fact intended show its mostly prop motor deter mines power input Neither Part 3 nor other part ever intended Elec tric consumers report So far know arent bad motors used graphic presentation has also used own planes Further cases sample given motor type characterized evaluated-surely insufficient evidence form judgment against product Also Part 3 some folks clearly mis understood some basic prop/battery power relationships Others clearly caught up board Some latter sent additional graphs equa tions Two mamrfacturers quired about data give promised fairly large number letters came folks active modelers years past drifted out hobby Now have renewed interest because Electrics Some readers took time tell what flying let tell variety out designs original kit conversion frequently mentioned Its Drifter Two Power always something 05 075 range received few phone calls want mention two two highly experienced highly regarded Electric fliersJim Zarembski RCM columnist Keith Shaw impressive Electric flier Ive ever seen Continued page 82 Olympic Two built Brian Bailie mew has brother John weighs 5Y2 lb powered pod-mounted Astro 25 16 12 Ah cells carried pods beneath wing Uses 9-6 propeller Wing loading comes about 136 ozisq ft 10-mm flights typical Unarles Hampton tiles Airtronics Olympic 650 Mabuchi 550 motor 8-4 prop eight cells size unknown An excellent flier photos month Herb Dirks Incorporated 322 So Gallatin RdMadison TN 37115 615 868-6811 Mon thru Sat am 500 pm - FUTABA RADIO SALE Because care radio systems prechecked f REPAIR SERVICE FOR proper operation prior shipment HOBBY LOBBYFP-7GK 72FMS125 ist535995$24150 E K LOG CT RO LFP-7GK 72AM5-28Iist$35995$22500 FUTABA FTFP-5GK 72FMS-12a Iist$31995$20100 FP-5GK 72AM5-25Iist$28995sisi 50 HOBBY SHACKFP-4LW/3 S-28servosIist$19995$11500 ROYAL LINEAdd $295 Prepaid Mastercard Visa COD $495Tenn residents add 675% tax 82 Model Aviation Jim Keith both picked up po tential trouble spot Part 5 part illustrated preferred battery installation cooling technique cooling air enters above battery flows through cells exits via holes floor fuselage reported stances depending shape fuselage flight characteristics etc peculiar air pressure imbalance can develop prevent airflow out fuselage bottom solution put reverse airscoop forward air exit holes resulting step cures adverse pressure buildup fuselage bottom may explain Ive battery heating problems 1-3 However trying retain scalelike appearance made air intakes rather small Perhaps heating problem resulted com bination both things know cooling method described works very well other planes far scheme Ive used Id like expand Whenever put new model use very carefully check battery motor heat following first several flightsjust make dam sure no gotchas Further after flights some planes often physical evidence good air flow through battery What could Brush dust Several high-powerspending models also spend brushes resulting dust pictured earlier series stuff follows cooling air stream gets deposited anything paththe battery cells right through air exit holes isnt much brush dust 1-3 its hard brushes Im going try suggestion Thanks Jim Keith Some readers reported being interested series cut out articles kept separately Its too bad maga zine articles have spread out over pages thats has Based reader inputs popular Electrics gliders second-mostmentioned type Old-Timers hope thats because folks think nothing else can successfully done Dont forget Scale Aerobatics Pylon Racing great catch-all sport flying Nobody wrote anything about contest terests clearly supports whats lemed Keystone RC Club Electric Fly events far people just want get something flying electric powered pursue simple fun figure sooner later satisfaction success become routine fun will begin mean com petition number comments received la menting seemingly short supply basic Electric information thus endearing series readers default also took note widespread lack dealer interest knowledge Elec trics Several readers requested additional assorted topics covered series Continued page 171 LLL 13311 Beach Ave na Del Rey 1S 1-6242 SALESI RADIO SYSTEMS FUTABA ROYAL ACCESSORIES FOR MOST RADIOSI trics/Kopski Continued page 82 example reader wanted coverage air foils Electrics Others requested series made book Still others wrote wanting buy some models pictured Its very difficult cover everything dont know what means far airfoils go good airfoil glow engine plane its almost certainly good wing section Electric assuming plane also appropriate book has discussedthe outcome certain dont have planes sale does occur theres usually someone whos waiting Some readers asked about suppliers Electric goodies could develop list always chance Id inadvertently miss someone Id want have explain away Besides can al ways thumb through maga zines check ads Catalogs price lists available suppliers usually nominal handling mailing fee Its few cents well spent memorable letter came 14-year-old Tracy Reno wanted know about electric-powered ducted fans Personally have no relevant experience could tell what hoped likely successful truly regret having let down Its likely Ill forget Very sorry Tracy new product Part 4 batteries described two commonly used cell capacities 055 Ah 12 Ah noted latter larger cell size rapidly growing popu larity Since writing new cell size has become available Its 08 Ah capacity available both Astro Leisure have seven-cell battery its weight 9 oz can see individual cells about 13 oz Now lets some arithmetic have stated cell ca pacity weight closely related cells should weigh about 08/12 times weight 12 Ah cell larger cells weigh about 2 oz Both Sanyo Guess what 08/12 x 2 Hows being close Remember theres no magic cant get something nothing havent chance use new pack yet plan Remember south eastern Pennsylvania has four-season year dead winter written should view size option component ever-increasing number Electric parts supplies more stuff use more opportunity Electric flying choices success satisfaction SEAM Society Electric Air craft Modelers new fairly recent founding What really new about SEAM its recent recognition AMA Special Interest Group action places SEAM very important position guiding force matters Electricincluding such things competition rules team selec tion records safety etc Such AMA recog nition assumes SEAM unified voice interested Electrics youve come far series youre clearly interested Electrics go step further drop line Society Electric Aircraft Modelers 11632 Flamingo Dr Garden Grove CA 92644 Ask latest info application member ship Ten bucks adds name grow ing voice gets regular newsletter way SEAM organized district like AMA district has SEAM director Im director District 3 future What likely future Electrics will growth popularity feel sure pretty safe conclusion part no other reason fact Electrics quietand coming more necessary more places course Electrics also convenient quite workable applicable very wide range modeling interests etc Most kind flying fun future also will see introduction refinement Electric classes orga nized competition wonder readers remember knew June 1984 171 4 CYCLE POWEHeu au wINGSPAN SEND $100 FOR COMPLETE CATALOG OF FINE KITS RIC SCALE PLANS Curtlss Hawk P4-E 60 gee 55W eq I. plum$3495 Aeroacs Model K-1937 51 gee $1995 Pipe Super Cub CnaIer PA-Il 51 gem. $1995 PIperPscerPA-2e 59 ge V kde$2995 Piper TiE-Pacer PA-Il 89 gem Scale$2995 DH-5LeopardMoth111s1eaAkuh$1995 DH-80APussMoth111gee.AScd$1995 Sphmks Akroanaster 60 gem 1/5 Seal$1495 Send Self-Addressed Stamped Envelope Complete List HOBBY CAPITOL RIC 46 N Oak St. Ventura CA 93001 Ikon NWST PO Box 566 Auburn WA 98071 206 941-8248 HIgh tensile aluminum alloy Preclslon machIned polished Hardened socket cap screws Included DRILLED AND TAPPED FOR No 31658 ENYA 35-40895 No 31984 ENVA 601295 No 31995 ENYA 901296 No 31452 HP VT 21750 No 31644 HP VT 49896 No 31654 MAX FS 40896 No 31964 MAX FS 60-75-901295 No 32175 MAX FS 1201996 No 31463 SAITO FA 30750 No 31474 SAITO FA 40-45896 No 32196 SAITO FA 1201996 AT MOST HOBBY SHOPS OR ORDER DIRECT Send 100 12 page illustrated catalog L Consumers Guide RC Aircraft Products 242 Pages Hundreds New Products Photos & Descriptions over 2000 RC Aircraft Products fered 176 companies Outstanding Value Only $495 plus shipping* Send $660 Includes UPS ft handling Foreign ordars send $786 US surface mail sios us air mail Catalogs companies would cost over 10 times price outstanding reference book product lines nearly major man ufacturer distributor importer well unique interesting products small companies seldom advertise national modeling magazines July 83 Model Aviation See Local Dealer Order Direct SAME once Rudder Only RC event thing has start somewhere good things grow get better stand Electric threshold now As Electric products dont see significant changes present day peifor mance levels long time say cause major breakthroughs motor efficiencymore output less less inputare improbable Most motors already quite good Ni-Cds likely remain pretty much now know know no other battery technology horizon will soon re place have simple way looking Lets pretend some really nifty magical battery out packs kinds capacity virtually no space weight Until such battery makes its way electric toothbrushes cordless shavers grass trimmers toys etc such wishbook battery would remain too costly ap plication Please dont misunderstand am saying new products wont con tinuing along However am saying feel performance now have available modeling use about level well seeing several years Thats opinion folks Things Id like see think no dramatic breakthroughs close hand expect see continuing refinement improvement contemporary technology too very safe position assume because thats what has hap pening during past decade con tinuing right now What Im looking new little things will make present products appealinglonger lasting easier use better buys readily available whatever example Id like see armature shafts harder bend Id like see sophisticated chargers accommodate varied battery configurations Id like see motors carefully configured flow-through cooling ducts directed brush-commutator area Id like see kits Electric Id like see versa tile motors design ie such fea tures removable flux rings optional armature windings optimum designs Pro-Built Price Magic DragonEngine 25 cu Wing Span 55 TrainerRadio 3 4 Channels balsa coostroctlee Reedy lbs sand mid cover Control sur faces hisgad Hake Inedleg gem 5/32 nnaa gew otrat Fittad canopy lastractica booklet end dwere Included Pre-Built Price $12496 Engine 40 Cu F ire FoxWing Span 52h Radio 4 Channels balsa cesstroctiea Reody floe sand mid cover Control so. faces hinged Has bolt-es wing end limbo lending gem ASS wheel pasts mounted atelt Installed Fitted cempy leotroctina booklet nod lssrdwnre Included 6 Other ModelsSend Free Brochure 990 16th Street Seed checker M0 Palm HarborCredit Cords occeptod RO $850 UPS FL 33583shIpping hi 350 PSI cain ECHRIC 181317954560FLroooddS%tas DEAL ER INQUIRIES INWTED can made serious modelers time kinds features would find way routine use skilled beginner alike recognize some asking lot five years ago never would have expected see what now market Keep mind have something chicken-and-egg situation Suppliers must have sales products now have make better things future items now have work friends pretty darn good less accept above can see waiting probably wont make major difference go now Read series again necessary think about what youd like fly figure out what will take Make Electric Elation yours Some oversights reflecting series clear could have thorough few areas recent example Part 7 Playboy detailed table vital statistics gave com pleted empty fuselage weight 3 oz reader took task weight correct should have noted landing gear modified gear could attached after covering rather being built-in per plan Theres difficult area need some expansion have seen large vari ety possible electric power options several combinations motors props batteries could produce about same de sired power level may difficult make choice Certainly price availability could factors another factor worth considering battery pack tabulations Part 9 clear about same given power level can achieved relatively higher voltages lower currentsand other way around too Motor prop combinations using higher voltages require cells means higher costs turns out vari ous cell sizes capacities cost about same Thus its possible purchase exactly same energy storage variety prices might now conclude lower voltage higher current way go other considerations Gen 172 Model Aviation FOUR CYCLE ENGINE MOUNTS NEW IUSY PEOPLE KITS CITADRIA STINSON L5 9 NAZLIN 50L 16 INCH ALL BALSA DELUXE PRE-FAB PROFILE FLYING MODELS $695 RUBBER POWER LOG $150 4024636 PECk hPPIar 1 4098675 W BOX 2498 -MA LA MESA CA 92041 Send check money order Con9emers Gold 150 Oft St Hardianburn VA 22801 erally its much harder handle higher current higher voltage may remember discussion about cur rent multiplied itself calculation power losses such wiring motor brushes armature winding resis tance system efficiency suffers more current rises meant confuse rather point out variety con siderations especially serious modeler after last word what can accomplished readers just starting out feel uncomfortable finer points should means go easier route Pick system easy charge less costly go after fun youve tasted success need top what have just done go back reread senes Part 8 Rule Thumb offered guideline power needed cruise want expand bit word may have given wrong impression Cruise has certain comfortable feel ing associated just cruisin along What meant power given Rule Thumb realis tically motor input power needed just barely maintain air space between model terra firmawith some body English thrown good measure can assure know what meantthat ol bend-thestick-back feeling just didnt say cor rectly Anyway power needed put ball park clearly too useful Twice value gets very fly able airplane almost time make bit easier everyone Ive come up graph shows same thing design example Part 9only lot subject power some words about variable power con trols An electronic throttle very nice feature worthwhile have excess power margin other words plane flies rather unim pressively full power pro portional control wouldnt worth having However planes ample power feature can add great deal pleasure flying something left control can some gratifying maneu vers ease just right amount power thing correct landing ap proaches spot landings can become rou tine Slow quiet shoulder-height flybys become awesomeand quite safe because Im talking about some roaring bomb could permanently part hair Finally back Part 2 erroneously wrote prop adapters small motors use hard-to-get 5-40 screws Oops use hard-to-get 6-40 screws ending know must some doubt about series ever ending since has continued grow beyond earlier nouncements really ending follow-up plans mill Spectra construction article coming up will writing continuing column titled RC Electrics intent will offer how-to information monthly basisand some news views too mind Id welcome input information photos interested readers have say CUSTOM TUNED ENGINES COMPETITION ACCESSORIES SPECIALISTS IN CUSTOM COX TD & REED ENGINES STD & R/C CUSTOM PARTS FOR ALL COX ENGINES COMPLETE INVENTORY OF INDIVIDUAL STOCK PARTS FOR ALL CURRENT TD & MEDALLION ENGINES MANY NEW PARTS FOR DiSCONTINUED COX ENGINES HARD CHROMING OTHER COMPETITION ACCESSORIES IGNITION ENGINE SUPPLiES ETC FOR DETAILED BROCHURE SEND T5* TO KUSTOM KRAFTSMANSHIP P0 BOX 2699 LAGUNA HILLS CA 92654 TELEPHONE 014 830-5162 up front cant promise offerings would printed Ill best everyone addition regular column still intend have occasional feature covering some Electric topic too long column formatsort series supplement Good Editor very flexible column format significantly shorter arti cles such can readily see looking various columns issue Anyway can expect continuing Electric coverage variety length particulars turns out another suggested/requested things incoming mail wasyou guessed ita regular column MA Any comments questions series may sent author SASE Bob Kopski 25 West End Dr Lansdale PA 19446 Meanwhile sincere Thank staying series may Electric Elation yours PRODUCTS FOR THE DI$CERNING MODELER Complete Line Exhaust Systems * Tuned Pipes Muffled Tuned Pipes Headers Venturi Mufflers Expansion Mufflers copter Ball Mufflers ialized Exhaust Systems Unsurpss W..Ah nc June 1984 173 J-5s EXCITING NEW GIANT oard Tunneihull Kit clw fiberglass cowl Complete kit 2 hp outboard motor J5 elers ChoIce GMP EPOXIES High Quality Model Construction Jr Kwik Set 6 Minute5 oz * 550 Kwik Set6 MinutelOoz$ 995 Giant wik Set6 Minutel6oz $1295 Half Fast 10 MinutelOoz* 850 GMP AIRCRAFT INSTRUMENTS 80in3116114316112$ 149 40 3/4 inch$ 149 EASY OFF PULLER proper tool removing drive washers flywheels$ 795 Gas Model Products 8773 Russet DR Cinclauatl 0H45239 f513J 385-7398 Emtstwddsrmdsr&wt PutqSAHid$iSO