Radio Control: Electrics

Radio Control Electrics Bob Kopski THE PLAYBOY again Two months ago January 1985 RC Electrics column described 45%-of-chord CG center gravity location Playboy some recent conversation Roland Boucher Leisure Electronics learned CG can actually allowed go back far 60% gonna stay now have some liberty Playboys still under construction Youll recall unusually aft CG location permitted large lifting stab popular OT Old-Timer design Dont try contemporary designs though results could catastrophic Battery packs Another reference January column seems worthwhile time described assembly nine-cell 08 Ah ampere-hour pack using silicone adhesive glue cells some balsa separator strips together also noted end method did work out well fact silicone simply did have enough stick plastic cell coverings common experience see packs assembled cells simply glued together CyA quite strong assembly technique However should ever necessary remove cell perhaps reshape pack dif ferent installation joint strength makes things quite difficult likely result attempted disassembly will tearing plastic cell sleeves accompanying photos show ap proach permits fairly strong pack assembly yet can reworked Heres its done black tape shown ordinary 1/4-in black vinyl auto-trim tape tape intended decorative pin-strip ing available popular auto store chains tape comes colors combined colors exam ple shown wrapped cells near ends several layers tape used six wraps cell end can varied suit need hand cells wrapped laid side side opposite polarities adjacent easy wiring practice two wood strips pinned bench cells laid side side between rails help assure alignment tape wrap bumps mate thus separate cells slightly Now enter CyA drop inter section tape wraps does trick perhaps squirt accelerator firmly bonds tape tape taken let dribble onto plastic cell-wrappers pictured seven-cell pack made up two subpacks three four cells respectively subassemblies themselves separated two strips 1/8 1/4 balsa also CyAed place Now should ever necessary remove cell cut can made top wrap layer tape another suit ably-wrapped cell substituted damage cells own plastic wrappers cell separations inherent technique allow some additional air circulation Anyone whos following column knows Im good battery cooling besides trim tape have left over can used get out RC Electric youll need know some basic principles electricity Bob Introduces subject month will continue future covering such topics choose use simple meteringsuch left LR iab quality Simpson 261 Heath digital Radio Shack analog Radio Shack digital Large unit below homemade having both volt amp meters wandering junk pile R Bobs Octopussy made name up before James Bond movie came out its used connect almost conceivable kind Electric unit otherregardless what kind connector unit has secret having Positive contacts wired together also Negative contacts Jacks plugs galore 50 Model Aviation Bob modified battery connections car make convenient charge flight packs field gives instructions column Photo shows Positive ter minalthe Native gets Similar treatment bunch six No 12 cables cables runs through conduit back carmakes very low electrical resistance forewarns us some foreign cars have Red cables Negative terminal Biack Positive contrary US standards fail notice hook up charger backwardsitll burn charger up Thanks tip Bob Boucher guessed trim plane An ominous implement ghastlylooking device shown photos prop SciFi movie fact most-used tool annual Electric Fly Clinic awesome device other Octopussy d before James Bond movie same entitlement made rounds conceived built satisfy need desire mate just about anything Electric just about anything else Elec tric ector styles notwithstanding now should clear everything box simply large assort ment male female connectors hav ing wires same polarity con nected together effect two electrical conductors entire assembly positives connected together negatives connected together Its simple Using device obviously allows sorts mismatched connectors mated via Octopussy intermediary Thus small male Molex can connect ed large female Molex auto cigarette-lighter socket can wind up being pair test clipsor other options Its just great lab-type test setupsand Electric Fly Clinics faced helping troublesome installations get fixed upno matter wired idea simply pass concept itself Obviously can same thing fewer connector options Serious Electric mod elers can easily configure Octopussy suit own needs Most users would Continued Page 136 LIGHT TgYOL HOBBIES PO BOX 5387217 7877811 SPRINGFIELD ILLINOIS 82705Hours 10am 6pm Monday-Saturday MasterCard VISA welcome Send caahjers check money order immediate proceasing add $300 postage handling Illinois residenta add 6% sales tax $500 postage handling charge card orders deliveries made via UPS FREE GIFT oz Goldberg Jet Super Jet choice minimum $50 order Cash Credit Toll Calls Deduct $1 purchase price long distance phone orders $50 Prices subject change notice MUUEL 11110 aIRYRONIcs SAGITTA 900 U95 SAGITTA 0004895 OLYMPIC II 5295 OLYMPIC 650 BRIDI AIRCURISER252695 AIRCROISERSO3895 EXt1495 EO2 1002196 KRAPTY 25 8 ERAFTYSO 1595 LOADSTAR4D 4195 WARLOAD4O 5 GYRO I/oke 000 raVen2595 3295 THEXLPAITERN5595 BREZEE BIPE4595 TRAINERKRAFT4O3595 VAGABOND 404595 covERrtE GEE BEE SPORYSTER5495 THE JEEP5995 GEE BEEE5996 GREAT PLANES SUPER SPORYSTOR us5996 SPORT5TER BIPE 40. SUPER SPORYSTERES9295 CAP 21609995 GOLDBERG JR TIGER 3995 SKY TIGER. 4255 EAGLE63 4795 FALCON 56 5 SR FALCON5995 JR FALCON1595 SKYLARK 56MK II3995 SKYLANE62 4995 CURTIS HAWK3995 RANGER 42 IARFI2455 GENTLE LADY1955 BOB MARTIN MODELS IHOOSE OP BALSAI 2c4 s 2o51795 TATEVAN2195 1I4SCALEPETE 495 PSODUCTED FAN12495 P51405IZEGLASS t295 P5140 SIZE BALSA 4195 PIENTENPOL 5 COYOTE 5995 KATIE/I 4195 SPY6795 SUPER GRYPHON 5995 HO8IEHAWK13995 1124901 MUSTANG1895 112A FOCKE WOLFE1695 1I2ABONANZA1995 1124 MEisS1995 1124 PETE1995 1I2ACHIPMUNK1996 TWO TEE 1795 MARKS MODELS SCORPION IV3295 MIRAGE3495 WANDERER 953495 B5SHWACEER3495 SUNNY HONKER BIPE2a95 HONKER 1121595 Lit GYPSY2295 PITYS3995 MINI BIRD OF TIME3995 SENSOR 9695 PHANTOM5a95 AMERICAN EAGLE2995 P475 RAZORBACK9695 FUN COBRA2995 FUN MUSTANG2895 HELLCAT9695 190 DH P005595 P1154995 PSiD sass MElO5G24995 CORSAIR7495 ATE4995 MIDWEST GAS BIPE STICK3995 SWEET SLOW3995 GIANT SWEET N LOW8995 LAZY BIRD3995 SOARER2585 PIPER COB founT2795 BEERCAT3995 TCRAFT3595 PATrERNMASTER3795 GAS LIL STICK3995 SUPERSWEETSTICK CESSNA CARDINAL2495 SUPER CHIPMUNK3995 HEINKEL SWEET STICK 403995 SILENT SOUIRE 2795 ATTACKER3995 TWIN STICK TRAINER3895 CHAMPION MEl2595 PERFORMER1995 JETSTER2U3195 PITTS SPECIAL 001 IduGHo 14512395 PICA SPITFIRE 6995 P00190 DS 7295 CESSNA 1827995 BOCKER JUNOMEISTER. 7995 SHOOFLI5295 TOUCHE4195 JACK STAFFORD TOM KITTY us IIouIIlI3795 TOM KITTY MK3995 TWIN COMANCHE B24 LIBERATOR12595 P354795 SUPER BUCCANEER2795 SUPER BUCCANEER 11541111 2895 AIRCOUPE . 95 CHIPMUNK5995 BAA ACRO SPORT. EAA ACRO SPORT 1104111 5995 SIG ASTRO HOG4995 KOBRA2595 PIFERJ 33795 PIPERCUB1I4S10695 CLIPPED WING CUB.3795 CLIPPEDWINGCUBI1/455a1e19696 RISER1995 HUMMER1695 KAVALIER3996 KIWI3895 COLT. 2396 DOUBLER II2595 CITABRIA5995 LIBERTY SPORT 9595 SMITH MINI PLANE4995 RYAN STA. . 7495 ZLIN ACROBAT5395 KADET MK II. KADET JR2895 SKY BOLT5795 KOUGAR MK II ELIPPER2195 SUPER SPORT2195 450 MUSTANG3995 KOMET BALSA5995 KOMET PLY5995 KOMANDERMKII . BONANZA8195 SCAMP2295 KING KOBRA 95 EWIK BUILTS P51 CESSNA 150 8395 SUPER CHIPMUNK599S CESSNA 172 96 ROYAL HIENSE 11595 ZERO SR AEMS9195ENGINES SPITFIRE SR9795 CORSAIR SR F4UID OS MAS wIMIAI 199 OSCAR SR 6143969510 FOR RIC 255 P00190tSR/C .3295 P0 F BEARCAT20 RIC 5 3395 PSi S25 FSRRIC 95 STUKA959525 PSR RIC ABC5595 MElDS 969528 P55 RIC5796 CESSNA 182969528 PSR RICH 9695 PIPER COLT SR9495306/C 3595 SPIRIT OF ST LOUIS1529535 RIC4995 PITTSLILSTINKER989540R/C5795 PuTS S2979545 PSR SIC9295 STAGGERWING979540 FSR SIC ABC7395 CESSNA2DE4SFSRRIC9595 F4J PHANTOM45 PSR SIC ABC9695 50 P55 S/C8295 51 P58 SIC11995 TOPPLITE01 P55 RIC ABC13995 ELDER359590 PSR SIC 12395 ANTARES GLIDER5495100 FSR SIC13995 HOT KANARY4995PT12OTWIN39595 SESA9695FS404-CYCLE9595 HEADMASTERAD5995PSS1 4CYCLE12295 ZERO7595P5904CYCLE14295 J3CUB7D95P51204-CYCLESINGLE17985 CONTENDER6295 CONTENDER 40 FRESHMAN TRAINER. 4995 P51 MUSTANG9995 RADIOS PAD WAREAWE9695 P35AIRCOBRA6995 P47 THUNDERBOLT . 7995 CORSAIR7895 BEARCATFSF 7895 METRICK3595 OTHER KITS AVAILABLE AT COMPARABLE PRICES ACCESSORYCOMPLETION KITS T/1eU HI shOppIo to/Hardware Otter custom lit 101 1101111/ Sit 900SSSOI/HS ISOUIIHO CompletH yOUr model spediutly grouped nconoenenl kit torm allow low P110115 AooHssollHs also avuilaSIS sepArately FUTABA RADIOS PriCeS ava/451e upon reqossO PG cr14 SERVOS 6 PG /s14 SERVOS 8 SGH cr/A SERVOS 5 P0K cr14 SER AM 5 FGK 1s14 SER PM S PGK 014 SER AM 5 P0K cr14 SER FM 7 P0K cr14 SER AM 7 FGK /514 SER FM PLUS. PAINTS COVERING MATERIALS ADHESIVES PRO PS GLOW PLUGS AND MORE March 1985 Making own battery packs Gluing cells together directly poses two problems get apart ruining cell coverings have replace cell allowIng good air circulation around cells cooiing Bobs solution use vinyl automotive trim tape make thick wrapping end cell gluing wraps together CyA glue Note Positive Negative ends cells alternate convenience making InterconnectIons two banks ceils separated balsa strps also cemented Replace cell Cut through layer endwrapping glue new wrapped cell 51 RC Electrics/KopSki Continued page 51 probably find assembly both largeand small-sized Molex connectors set alligator clips male female Switchcraft charger connectors round types supplied Astro would cover needs way box small plastic housing screwed-on metal cover Radio Shack Dont use metal box cause chassis-mounted connectors would make box electrically active subject accidental contact something else Along same line using such device wary dangling unused leadstheyre hot also usually con nect unused like-types together keep out trouble example Im using banana plugs sockets plugs put sockets etc few bucks few hours effort too can have very own self-styled customized electrified Octopussy Charger connections next subject deals connections auto battery Generally auto battery best choice charging source field car has surely enough capacity available battery reasonably good condition provide enough enthusiastic Electric fliers given outing course smaller systems can charged using smaller sources such popular motorcycle batteries Personally use auto battery plus additional inter mediate-size battery field box namely tractor-size deep-cycle battery Sears Any active flier familiar potential untidiness connecting auto battery Usually charger has clip-leads can connected some battery terminal typical terminals however often corroded least dirty greasy same time its very important make solid contact between charger clip leads battery terminals Very little ohmic contact resistance can tolerated especially charging larger flight bate1a V ho Radio hands stsy warm dry flyl Weather proof vinyl exteriorPlush Fleece lining Safe Velcro closures top aides choice biplane saIlplane helicopter boat car patterns no design New winter flyer pouch$1895 ppd US Improved standard carry pouch$995 ppd US Both models protect valuable radio dirt oil shockl Order Eichers Fine RC Accessories 819 KIng Street Mediord OR 97501 24 hour COD ordering desk 503779-6018 teries Often small charger clips wont open far enough get good grip What can done photo herein intended suggest some battery connection options enterprising modeler might originate battery terminal pictured trusty rusty 77 Volare wagon recently installed permanent heavy wiring battery rear station wagon now have massive current capability way dont have go under hood much better way fly anywayout back wagon toughest problem entire installation coming up way connect battery After numerous conversations fellow fliers pic tured scheme implemented Im suggesting such permanent stallation everyones car tech niques used can modified permit easy clean convenient charger con nections under hood First original auto cables removed battery terminals both battery posts cable clamps cleaned up thick solu tion brushed-on baking soda water neutralized surface bat tery acid baking soda residue rinsed off flood clear water terminal posts cable clamps polished up battery terminal tool combination inside outside wire brush light sandpaper short piece 1/2-in id soft copper tubing flat tened middle drilled match bolt holes new universal replace ment cable clamp replacement clamps available auto chain stores about buck tubing bolted new clamp using screws come tubing thus provided two new battery posts installed both original car cables new cable set runs rear car latter cable made up six No 12 wires bundled fastened second new universal replacement battery cable clamp copper tubing tinned mounting bolts cable clamps came contact Editors note Tinning means coat surface C02 ENGINES WE NOW HAVE COMPLETE LINE OF BROWN TELCO DAVIS CO-2 ENGINES INCLUDING SPARE PARTS SERVICE BROWNTEL CO A23 PEANUT$3990STANDARD TELCO$2496 CAMPUS SEE$3455TURBO 3000$3288 CAMPUS TWiN$5995TURBO sf00$3995 SODA CHARGER $1285 A0/S- COX 02 CONVERSION TO CO2$3895 NEW CD4T4L00 Ne 25 $150 D*IAAIaAamAm PHONE eta 4424536 c5959v9795u59e r Ole 4498975 W BOX 2498-MALA MESA CA 92041 of the metal melted solder RMcM installation may over kill Electric fliers simply want connect charger car bat tery techniques should provide some ideas such simple task better general its good idea keep auto battery posts connec tions clean free corrosion Figure out what connection scheme makes sense use approach shown leaves original equipment cable intact yet provides several connection options tem porary charger-clip connections example consider just using longer bolt set either universal replacement clamp itself hold copper tubing clamp longer protruding bolt can make very good small post attach charger clips course car already outfitted re placement cable clamp have replace its bolts longer ones Finally consider using some protective coating over shiny new connector set help resist dirt corrosion Auto stores usually carry variety protective coatings course dont want coat over intend clamp charger clip-leads Anyway coat ings just keeping battery area generally tidy condition will also help assure clean condition charge clips car will benefit too After strong argument Electric clean power source Whatever modifications may choose make own auto battery termi nals connections sure exercise great care working area auto battery has lot stored energy accidental shorting can result extreme heatingor worse Work slowly carefully sure disconnect both battery cables though youre work ing time auto batteries carry warning caution labels read Finally dont feel comfort able confident what youre doing dont Basic electricity January 1985 issue MA extensive coverage 1984 136 Model Aviation PRODUCTS pffl TIJS flISdDuiUf MflflBI BA Complete Line Exhaust Systems Tuned Pipes9 Muffled Tuned Pipes * Headers uri Mufflers Expansion Mufflers * Helicopter Ball Mufflers Specialized Exhaust Systems Unsurpassed Wnr C mnshin h Performance have first guide book pages falling out cause use much Im glad see second edition come out Ronnie L Mull Martinez CA recently purchased Second Edition found exactly advertised would very much like see Guide continue year after year. Gregory McCullough Homer AK Join thousands satisfied consumers already using Consumers Guide RC Aircraft Products2nd Ed Electric Fly reference made outstanding planes flying Keith Shaw However injustice done Keiths planes incor rectly named aerobatic ship called Columbia rather Coulombia electrically-experienced modelers will recognize obvious word play coulomb electrical unit measurement particular coulomb quantity electric charge transferred current ampere flowing second Whats mean average Electric filer much [t lead-in subject hand photos shows variety nultimeters multimeter instru nent can measure variety elec rical quantities never coulombs rhe common parameters familiar 4C DC volts amps resis ance unit ohms often get letters Arherein modeler sorta familiar terms above adequately nake best use under tanding care utilization either neters electrical installation nodel Such understanding can make lectric lot rewarding vho pursue casually Probably familiar term volts Vithout trying get too technical volt unit electric potential leaders foreign publications Will see word tension used instead Anoth er term similarly used electromotive force sake simplicity will take some liberty technical precision ask think voltage pressure water pipe Pressure actually force per unit area Lets say water supplied overhead tank pipe comes out bottom tank addi tional water added tank such depth water doubled water pressure would double Stacking up two similar cells connecting series doubles total voltage same idea holds number cells depth water tank chemistry battery cell estab lishes terminal voltage cell Nickel-cadmium cells interest Electric flier have nominal voltage about 125 volts 12-volt lead-acid auto battery comprised six series-connected 20-volt cells Ordinary carbon-zinc flashlight cells have nominal voltage 15 volts Cells polarized have direction two terminals labeled positive negative conventions having direc tion electron flow thats whole story itself Suffice say bat tery consists cell con nected together two ways series parallel connection method interest us series~ means positive terminal cell connected negative next cell way total voltage ie voltage negative first cell positive second cell sum two cell voltages cells As story continues remember voltage battery estab lished cell type chemistry total number cells series voltage given fixed value given battery independent battery properly used Electric current expressed amperes some technical liberty may likened flow water pipe amperes flowing given cir cuit depend entirely available volt age resistance circuit water analogy water flow deter mined depth water tank voltage resistance water flow resistance flow water part hole size pipe Thus open-ended two-in pipe presents less restriction flow water does one-in pipe closed pipe pinhole represents 'dr cuit vastly greater resistance wa ter flow either other examples Both open end pipe pinhole may thought loads water tank Its water goes open pipe low resistance perj [IDDLn 1mm thick r ULLLI\ 042 taxed 16oz rubber per box Sizes $1260 per box ppd USA 32 _1 ______16 ILKA --__ _8 WAKEFIELD — 3S95piuauPstnglsh3 inished Front EndB Id ng _ardFIynt 16 SendVery Conrplte1 Jfor 198411985 catalog4 2 FAI Model Supply DIVISION OF BAR/RICH SALES CO #2 FAIRWAY HANNIBAL MO 63401 314 221-8803 aster jt MANUFACTURERS OF SPORT PATTERN STINGER II PEPPERMINT PATTIE 60 TAN PEPPERMINT PATTIE 40SPORT/SCALE PEPPERMINT PATTIE 15 HIPERBIPE Dealers & Distributors Welcomed Phone 703 273-9593 FLYLINE MODELS INC PO Sex 2136 FeIrten vIegna 22031 u 5 March 1985 137 What consumers say about Second Edition r Order Copy Today Only $860 Includes Postage Far foreign ii mail seed $1245 Consumers Guide 150 Ott Street Harrisonburg VA 22801 2 40 Wing 15 28 Engines World Aerobatic Champion L eos Laser Alsuhnm Lending Gear Fean WingAC Spas Whig Arum 1440 sqin Boise Risk Kit Complete Step ky Step leeftuotlom milk Pictures WeIght 16-20 EngIne 2-4 HP 95 19 PLUS Sales~N ROUSH MFG Tough Ut Ply Babe aud Foom Comtroctloo 64 Wlagipas Wing Are 640 Welgkt6to6YIks Baglee 45 604 2 cycle S hr Assembly lieu 89 Jr Stick Outstanding Large Trainer $9995 Dealer Inquiry Invited Manufacturers Quality Kits Send $100 complete catalog Turbo BD-4 Famous Homebuilt Light Plane mitting lots water flow current relatively heavy load other hand pinhole large resistance light load Thus tank battery will empty faster heavy load low resistance large pipe much slower pinhole condition light load As extremes no hole essentially open circuit permits no current flow Its like battery cell sitting shelf nothing connected short circuit such heavy wire placed across terminals charged battery would cause enormous current flow just entire bottom water tank removed once resulting inevitably tremendous flow water Thus amount water flow dependent both depth water overhead tank external condi tions pipe water load Elec trical current similarly dependent available battery voltage load resistance connected battery Putting water tank requires work Consider filling tank bucket time Up ladder Thats work has carry water against pull gravity get tank higher tank work effect work done imparting stored energy water Just simple fact water tank has elevation means water has potential energy Similarly charged model battery has stored energy model battery charged car battery energy ultimately came gasoline fueled auto engine turned alternator charged car battery Work done Like given size water tank Electric model battery big can hold its fill Think about concepts next month well get basic ideas can apply Well take look multimeters work use what readings mean few basics under belt youll have much better understanding things Electricsuch motor/bat tery circuit plane charger works should find hobby enjoyable fact its partly just kind question get incoming mail has prompted 'minilesson' basic electricity Let close acknowledgement some reader response earlier col umn Way back November 1984 issue offered no-rules approach getting simple Electric competition off running As part argument voiced model size power system makeup matter much fact Electrics will perform similarly independent size power-system makeup still maintaln position However same time must candor recognize matter degree reader has pointed out large planes fly better small onesthis based Reynolds number having nothing Electric pow er other power source Thus can argue Giant Scale flies better Peanut Scale context agree Secondly another reader called California point out large glider can seen farther small plane thus flight time can potentially longer former Having just gotten trifocal glasses couldnt agree still say let anything Electric fly early competitions After what pur pose served having book full Electric competition rules no interest ed able participants participant must come first Suppose right now national AMA set Electric competition rules governing size motors batteries whatever Can tell very active Elec tric enthusiast could go fly Elec tric contest Any reader comments questions can sent SASE please author meantime Happy Landings Bob Kopski 2S West End Dr Lans dale PA 19466 writing advertisers mention read about thorn Model Aviation RC Helicopters/Jolly Continued page 52 nal except tail-rotor assembly spection leads believe Kavan Kavan copies also suspect strong Kavan influence throughout de sign note anti-clockwise rotation rotor Also note super-looking flybar less rigid rotorhead now have set Sitars rotor blades epoxy fiberglass over blue foam incredible weigh 150 grams much stronger truer conventional wood blade Rick told machines available completely finished ra dio choice installed Im supposed see Bell 222s firsthand January can bet full report will follow months three-view all-time favorite helicopter Sikorsky S-67 Blackhawk following Military Helicopters World high-speed helicopter gunship developed Sikorsky private venture response Vietnam combat experience Some Blackhawks features based Sikorsky S-66 entry US Armys 1965 competition Advanced Aerial Fire Support System AAFSS well flight experience S-61 F compound helicopter De sign S-67 began August 1969 sole Blackhawk built flew first time exactly year later Although touted highly maneuverable gunship Blackhawk could employed troop carrier well style later Soviet Mi-24 Hind Designed outset gunship Blackhawk all-metal semimon ocoque fuselage narrow cross sec tion pilot copilot/gunner seated tandem forward beneath single Plexiglass canopy As troop carrier main fuselage cabin could divided two levels upper deck seating 15 troops lower section housing fuel ammunition Continued page 140 1 38 Model Aviation Rear 3405 Cleveland Ave SW Canton OH 44707 Phone 216 484-6810

Radio Control Electrics Bob Kopski THE PLAYBOY again Two months ago January 1985 RC Electrics column described 45%-of-chord CG center gravity location Playboy some recent conversation Roland Boucher Leisure Electronics learned CG can actually allowed go back far 60% gonna stay now have some liberty Playboys still under construction Youll recall unusually aft CG location permitted large lifting stab popular OT Old-Timer design Dont try contemporary designs though results could catastrophic Battery packs Another reference January column seems worthwhile time described assembly nine-cell 08 Ah ampere-hour pack using silicone adhesive glue cells some balsa separator strips together also noted end method did work out well fact silicone simply did have enough stick plastic cell coverings common experience see packs assembled cells simply glued together CyA quite strong assembly technique However should ever necessary remove cell perhaps reshape pack dif ferent installation joint strength makes things quite difficult likely result attempted disassembly will tearing plastic cell sleeves accompanying photos show ap proach permits fairly strong pack assembly yet can reworked Heres its done black tape shown ordinary 1/4-in black vinyl auto-trim tape tape intended decorative pin-strip ing available popular auto store chains tape comes colors combined colors exam ple shown wrapped cells near ends several layers tape used six wraps cell end can varied suit need hand cells wrapped laid side side opposite polarities adjacent easy wiring practice two wood strips pinned bench cells laid side side between rails help assure alignment tape wrap bumps mate thus separate cells slightly Now enter CyA drop inter section tape wraps does trick perhaps squirt accelerator firmly bonds tape tape taken let dribble onto plastic cell-wrappers pictured seven-cell pack made up two subpacks three four cells respectively subassemblies themselves separated two strips 1/8 1/4 balsa also CyAed place Now should ever necessary remove cell cut can made top wrap layer tape another suit ably-wrapped cell substituted damage cells own plastic wrappers cell separations inherent technique allow some additional air circulation Anyone whos following column knows Im good battery cooling besides trim tape have left over can used get out RC Electric youll need know some basic principles electricity Bob Introduces subject month will continue future covering such topics choose use simple meteringsuch left LR iab quality Simpson 261 Heath digital Radio Shack analog Radio Shack digital Large unit below homemade having both volt amp meters wandering junk pile R Bobs Octopussy made name up before James Bond movie came out its used connect almost conceivable kind Electric unit otherregardless what kind connector unit has secret having Positive contacts wired together also Negative contacts Jacks plugs galore 50 Model Aviation Bob modified battery connections car make convenient charge flight packs field gives instructions column Photo shows Positive ter minalthe Native gets Similar treatment bunch six No 12 cables cables runs through conduit back carmakes very low electrical resistance forewarns us some foreign cars have Red cables Negative terminal Biack Positive contrary US standards fail notice hook up charger backwardsitll burn charger up Thanks tip Bob Boucher guessed trim plane An ominous implement ghastlylooking device shown photos prop SciFi movie fact most-used tool annual Electric Fly Clinic awesome device other Octopussy d before James Bond movie same entitlement made rounds conceived built satisfy need desire mate just about anything Electric just about anything else Elec tric ector styles notwithstanding now should clear everything box simply large assort ment male female connectors hav ing wires same polarity con nected together effect two electrical conductors entire assembly positives connected together negatives connected together Its simple Using device obviously allows sorts mismatched connectors mated via Octopussy intermediary Thus small male Molex can connect ed large female Molex auto cigarette-lighter socket can wind up being pair test clipsor other options Its just great lab-type test setupsand Electric Fly Clinics faced helping troublesome installations get fixed upno matter wired idea simply pass concept itself Obviously can same thing fewer connector options Serious Electric mod elers can easily configure Octopussy suit own needs Most users would Continued Page 136 LIGHT TgYOL HOBBIES PO BOX 5387217 7877811 SPRINGFIELD ILLINOIS 82705Hours 10am 6pm Monday-Saturday MasterCard VISA welcome Send caahjers check money order immediate proceasing add $300 postage handling Illinois residenta add 6% sales tax $500 postage handling charge card orders deliveries made via UPS FREE GIFT oz Goldberg Jet Super Jet choice minimum $50 order Cash Credit Toll Calls Deduct $1 purchase price long distance phone orders $50 Prices subject change notice MUUEL 11110 aIRYRONIcs SAGITTA 900 U95 SAGITTA 0004895 OLYMPIC II 5295 OLYMPIC 650 BRIDI AIRCURISER252695 AIRCROISERSO3895 EXt1495 EO2 1002196 KRAPTY 25 8 ERAFTYSO 1595 LOADSTAR4D 4195 WARLOAD4O 5 GYRO I/oke 000 raVen2595 3295 THEXLPAITERN5595 BREZEE BIPE4595 TRAINERKRAFT4O3595 VAGABOND 404595 covERrtE GEE BEE SPORYSTER5495 THE JEEP5995 GEE BEEE5996 GREAT PLANES SUPER SPORYSTOR us5996 SPORT5TER BIPE 40. SUPER SPORYSTERES9295 CAP 21609995 GOLDBERG JR TIGER 3995 SKY TIGER. 4255 EAGLE63 4795 FALCON 56 5 SR FALCON5995 JR FALCON1595 SKYLARK 56MK II3995 SKYLANE62 4995 CURTIS HAWK3995 RANGER 42 IARFI2455 GENTLE LADY1955 BOB MARTIN MODELS IHOOSE OP BALSAI 2c4 s 2o51795 TATEVAN2195 1I4SCALEPETE 495 PSODUCTED FAN12495 P51405IZEGLASS t295 P5140 SIZE BALSA 4195 PIENTENPOL 5 COYOTE 5995 KATIE/I 4195 SPY6795 SUPER GRYPHON 5995 HO8IEHAWK13995 1124901 MUSTANG1895 112A FOCKE WOLFE1695 1I2ABONANZA1995 1124 MEisS1995 1124 PETE1995 1I2ACHIPMUNK1996 TWO TEE 1795 MARKS MODELS SCORPION IV3295 MIRAGE3495 WANDERER 953495 B5SHWACEER3495 SUNNY HONKER BIPE2a95 HONKER 1121595 Lit GYPSY2295 PITYS3995 MINI BIRD OF TIME3995 SENSOR 9695 PHANTOM5a95 AMERICAN EAGLE2995 P475 RAZORBACK9695 FUN COBRA2995 FUN MUSTANG2895 HELLCAT9695 190 DH P005595 P1154995 PSiD sass MElO5G24995 CORSAIR7495 ATE4995 MIDWEST GAS BIPE STICK3995 SWEET SLOW3995 GIANT SWEET N LOW8995 LAZY BIRD3995 SOARER2585 PIPER COB founT2795 BEERCAT3995 TCRAFT3595 PATrERNMASTER3795 GAS LIL STICK3995 SUPERSWEETSTICK CESSNA CARDINAL2495 SUPER CHIPMUNK3995 HEINKEL SWEET STICK 403995 SILENT SOUIRE 2795 ATTACKER3995 TWIN STICK TRAINER3895 CHAMPION MEl2595 PERFORMER1995 JETSTER2U3195 PITTS SPECIAL 001 IduGHo 14512395 PICA SPITFIRE 6995 P00190 DS 7295 CESSNA 1827995 BOCKER JUNOMEISTER. 7995 SHOOFLI5295 TOUCHE4195 JACK STAFFORD TOM KITTY us IIouIIlI3795 TOM KITTY MK3995 TWIN COMANCHE B24 LIBERATOR12595 P354795 SUPER BUCCANEER2795 SUPER BUCCANEER 11541111 2895 AIRCOUPE . 95 CHIPMUNK5995 BAA ACRO SPORT. EAA ACRO SPORT 1104111 5995 SIG ASTRO HOG4995 KOBRA2595 PIFERJ 33795 PIPERCUB1I4S10695 CLIPPED WING CUB.3795 CLIPPEDWINGCUBI1/455a1e19696 RISER1995 HUMMER1695 KAVALIER3996 KIWI3895 COLT. 2396 DOUBLER II2595 CITABRIA5995 LIBERTY SPORT 9595 SMITH MINI PLANE4995 RYAN STA. . 7495 ZLIN ACROBAT5395 KADET MK II. KADET JR2895 SKY BOLT5795 KOUGAR MK II ELIPPER2195 SUPER SPORT2195 450 MUSTANG3995 KOMET BALSA5995 KOMET PLY5995 KOMANDERMKII . BONANZA8195 SCAMP2295 KING KOBRA 95 EWIK BUILTS P51 CESSNA 150 8395 SUPER CHIPMUNK599S CESSNA 172 96 ROYAL HIENSE 11595 ZERO SR AEMS9195ENGINES SPITFIRE SR9795 CORSAIR SR F4UID OS MAS wIMIAI 199 OSCAR SR 6143969510 FOR RIC 255 P00190tSR/C .3295 P0 F BEARCAT20 RIC 5 3395 PSi S25 FSRRIC 95 STUKA959525 PSR RIC ABC5595 MElDS 969528 P55 RIC5796 CESSNA 182969528 PSR RICH 9695 PIPER COLT SR9495306/C 3595 SPIRIT OF ST LOUIS1529535 RIC4995 PITTSLILSTINKER989540R/C5795 PuTS S2979545 PSR SIC9295 STAGGERWING979540 FSR SIC ABC7395 CESSNA2DE4SFSRRIC9595 F4J PHANTOM45 PSR SIC ABC9695 50 P55 S/C8295 51 P58 SIC11995 TOPPLITE01 P55 RIC ABC13995 ELDER359590 PSR SIC 12395 ANTARES GLIDER5495100 FSR SIC13995 HOT KANARY4995PT12OTWIN39595 SESA9695FS404-CYCLE9595 HEADMASTERAD5995PSS1 4CYCLE12295 ZERO7595P5904CYCLE14295 J3CUB7D95P51204-CYCLESINGLE17985 CONTENDER6295 CONTENDER 40 FRESHMAN TRAINER. 4995 P51 MUSTANG9995 RADIOS PAD WAREAWE9695 P35AIRCOBRA6995 P47 THUNDERBOLT . 7995 CORSAIR7895 BEARCATFSF 7895 METRICK3595 OTHER KITS AVAILABLE AT COMPARABLE PRICES ACCESSORYCOMPLETION KITS T/1eU HI shOppIo to/Hardware Otter custom lit 101 1101111/ Sit 900SSSOI/HS ISOUIIHO CompletH yOUr model spediutly grouped nconoenenl kit torm allow low P110115 AooHssollHs also avuilaSIS sepArately FUTABA RADIOS PriCeS ava/451e upon reqossO PG cr14 SERVOS 6 PG /s14 SERVOS 8 SGH cr/A SERVOS 5 P0K cr14 SER AM 5 FGK 1s14 SER PM S PGK 014 SER AM 5 P0K cr14 SER FM 7 P0K cr14 SER AM 7 FGK /514 SER FM PLUS. PAINTS COVERING MATERIALS ADHESIVES PRO PS GLOW PLUGS AND MORE March 1985 Making own battery packs Gluing cells together directly poses two problems get apart ruining cell coverings have replace cell allowIng good air circulation around cells cooiing Bobs solution use vinyl automotive trim tape make thick wrapping end cell gluing wraps together CyA glue Note Positive Negative ends cells alternate convenience making InterconnectIons two banks ceils separated balsa strps also cemented Replace cell Cut through layer endwrapping glue new wrapped cell 51 RC Electrics/KopSki Continued page 51 probably find assembly both largeand small-sized Molex connectors set alligator clips male female Switchcraft charger connectors round types supplied Astro would cover needs way box small plastic housing screwed-on metal cover Radio Shack Dont use metal box cause chassis-mounted connectors would make box electrically active subject accidental contact something else Along same line using such device wary dangling unused leadstheyre hot also usually con nect unused like-types together keep out trouble example Im using banana plugs sockets plugs put sockets etc few bucks few hours effort too can have very own self-styled customized electrified Octopussy Charger connections next subject deals connections auto battery Generally auto battery best choice charging source field car has surely enough capacity available battery reasonably good condition provide enough enthusiastic Electric fliers given outing course smaller systems can charged using smaller sources such popular motorcycle batteries Personally use auto battery plus additional inter mediate-size battery field box namely tractor-size deep-cycle battery Sears Any active flier familiar potential untidiness connecting auto battery Usually charger has clip-leads can connected some battery terminal typical terminals however often corroded least dirty greasy same time its very important make solid contact between charger clip leads battery terminals Very little ohmic contact resistance can tolerated especially charging larger flight bate1a V ho Radio hands stsy warm dry flyl Weather proof vinyl exteriorPlush Fleece lining Safe Velcro closures top aides choice biplane saIlplane helicopter boat car patterns no design New winter flyer pouch$1895 ppd US Improved standard carry pouch$995 ppd US Both models protect valuable radio dirt oil shockl Order Eichers Fine RC Accessories 819 KIng Street Mediord OR 97501 24 hour COD ordering desk 503779-6018 teries Often small charger clips wont open far enough get good grip What can done photo herein intended suggest some battery connection options enterprising modeler might originate battery terminal pictured trusty rusty 77 Volare wagon recently installed permanent heavy wiring battery rear station wagon now have massive current capability way dont have go under hood much better way fly anywayout back wagon toughest problem entire installation coming up way connect battery After numerous conversations fellow fliers pic tured scheme implemented Im suggesting such permanent stallation everyones car tech niques used can modified permit easy clean convenient charger con nections under hood First original auto cables removed battery terminals both battery posts cable clamps cleaned up thick solu tion brushed-on baking soda water neutralized surface bat tery acid baking soda residue rinsed off flood clear water terminal posts cable clamps polished up battery terminal tool combination inside outside wire brush light sandpaper short piece 1/2-in id soft copper tubing flat tened middle drilled match bolt holes new universal replace ment cable clamp replacement clamps available auto chain stores about buck tubing bolted new clamp using screws come tubing thus provided two new battery posts installed both original car cables new cable set runs rear car latter cable made up six No 12 wires bundled fastened second new universal replacement battery cable clamp copper tubing tinned mounting bolts cable clamps came contact Editors note Tinning means coat surface C02 ENGINES WE NOW HAVE COMPLETE LINE OF BROWN TELCO DAVIS CO-2 ENGINES INCLUDING SPARE PARTS SERVICE BROWNTEL CO A23 PEANUT$3990STANDARD TELCO$2496 CAMPUS SEE$3455TURBO 3000$3288 CAMPUS TWiN$5995TURBO sf00$3995 SODA CHARGER $1285 A0/S- COX 02 CONVERSION TO CO2$3895 NEW CD4T4L00 Ne 25 $150 D*IAAIaAamAm PHONE eta 4424536 c5959v9795u59e r Ole 4498975 W BOX 2498-MALA MESA CA 92041 of the metal melted solder RMcM installation may over kill Electric fliers simply want connect charger car bat tery techniques should provide some ideas such simple task better general its good idea keep auto battery posts connec tions clean free corrosion Figure out what connection scheme makes sense use approach shown leaves original equipment cable intact yet provides several connection options tem porary charger-clip connections example consider just using longer bolt set either universal replacement clamp itself hold copper tubing clamp longer protruding bolt can make very good small post attach charger clips course car already outfitted re placement cable clamp have replace its bolts longer ones Finally consider using some protective coating over shiny new connector set help resist dirt corrosion Auto stores usually carry variety protective coatings course dont want coat over intend clamp charger clip-leads Anyway coat ings just keeping battery area generally tidy condition will also help assure clean condition charge clips car will benefit too After strong argument Electric clean power source Whatever modifications may choose make own auto battery termi nals connections sure exercise great care working area auto battery has lot stored energy accidental shorting can result extreme heatingor worse Work slowly carefully sure disconnect both battery cables though youre work ing time auto batteries carry warning caution labels read Finally dont feel comfort able confident what youre doing dont Basic electricity January 1985 issue MA extensive coverage 1984 136 Model Aviation PRODUCTS pffl TIJS flISdDuiUf MflflBI BA Complete Line Exhaust Systems Tuned Pipes9 Muffled Tuned Pipes * Headers uri Mufflers Expansion Mufflers * Helicopter Ball Mufflers Specialized Exhaust Systems Unsurpassed Wnr C mnshin h Performance have first guide book pages falling out cause use much Im glad see second edition come out Ronnie L Mull Martinez CA recently purchased Second Edition found exactly advertised would very much like see Guide continue year after year. Gregory McCullough Homer AK Join thousands satisfied consumers already using Consumers Guide RC Aircraft Products2nd Ed Electric Fly reference made outstanding planes flying Keith Shaw However injustice done Keiths planes incor rectly named aerobatic ship called Columbia rather Coulombia electrically-experienced modelers will recognize obvious word play coulomb electrical unit measurement particular coulomb quantity electric charge transferred current ampere flowing second Whats mean average Electric filer much [t lead-in subject hand photos shows variety nultimeters multimeter instru nent can measure variety elec rical quantities never coulombs rhe common parameters familiar 4C DC volts amps resis ance unit ohms often get letters Arherein modeler sorta familiar terms above adequately nake best use under tanding care utilization either neters electrical installation nodel Such understanding can make lectric lot rewarding vho pursue casually Probably familiar term volts Vithout trying get too technical volt unit electric potential leaders foreign publications Will see word tension used instead Anoth er term similarly used electromotive force sake simplicity will take some liberty technical precision ask think voltage pressure water pipe Pressure actually force per unit area Lets say water supplied overhead tank pipe comes out bottom tank addi tional water added tank such depth water doubled water pressure would double Stacking up two similar cells connecting series doubles total voltage same idea holds number cells depth water tank chemistry battery cell estab lishes terminal voltage cell Nickel-cadmium cells interest Electric flier have nominal voltage about 125 volts 12-volt lead-acid auto battery comprised six series-connected 20-volt cells Ordinary carbon-zinc flashlight cells have nominal voltage 15 volts Cells polarized have direction two terminals labeled positive negative conventions having direc tion electron flow thats whole story itself Suffice say bat tery consists cell con nected together two ways series parallel connection method interest us series~ means positive terminal cell connected negative next cell way total voltage ie voltage negative first cell positive second cell sum two cell voltages cells As story continues remember voltage battery estab lished cell type chemistry total number cells series voltage given fixed value given battery independent battery properly used Electric current expressed amperes some technical liberty may likened flow water pipe amperes flowing given cir cuit depend entirely available volt age resistance circuit water analogy water flow deter mined depth water tank voltage resistance water flow resistance flow water part hole size pipe Thus open-ended two-in pipe presents less restriction flow water does one-in pipe closed pipe pinhole represents 'dr cuit vastly greater resistance wa ter flow either other examples Both open end pipe pinhole may thought loads water tank Its water goes open pipe low resistance perj [IDDLn 1mm thick r ULLLI\ 042 taxed 16oz rubber per box Sizes $1260 per box ppd USA 32 _1 ______16 ILKA --__ _8 WAKEFIELD — 3S95piuauPstnglsh3 inished Front EndB Id ng _ardFIynt 16 SendVery Conrplte1 Jfor 198411985 catalog4 2 FAI Model Supply DIVISION OF BAR/RICH SALES CO #2 FAIRWAY HANNIBAL MO 63401 314 221-8803 aster jt MANUFACTURERS OF SPORT PATTERN STINGER II PEPPERMINT PATTIE 60 TAN PEPPERMINT PATTIE 40SPORT/SCALE PEPPERMINT PATTIE 15 HIPERBIPE Dealers & Distributors Welcomed Phone 703 273-9593 FLYLINE MODELS INC PO Sex 2136 FeIrten vIegna 22031 u 5 March 1985 137 What consumers say about Second Edition r Order Copy Today Only $860 Includes Postage Far foreign ii mail seed $1245 Consumers Guide 150 Ott Street Harrisonburg VA 22801 2 40 Wing 15 28 Engines World Aerobatic Champion L eos Laser Alsuhnm Lending Gear Fean WingAC Spas Whig Arum 1440 sqin Boise Risk Kit Complete Step ky Step leeftuotlom milk Pictures WeIght 16-20 EngIne 2-4 HP 95 19 PLUS Sales~N ROUSH MFG Tough Ut Ply Babe aud Foom Comtroctloo 64 Wlagipas Wing Are 640 Welgkt6to6YIks Baglee 45 604 2 cycle S hr Assembly lieu 89 Jr Stick Outstanding Large Trainer $9995 Dealer Inquiry Invited Manufacturers Quality Kits Send $100 complete catalog Turbo BD-4 Famous Homebuilt Light Plane mitting lots water flow current relatively heavy load other hand pinhole large resistance light load Thus tank battery will empty faster heavy load low resistance large pipe much slower pinhole condition light load As extremes no hole essentially open circuit permits no current flow Its like battery cell sitting shelf nothing connected short circuit such heavy wire placed across terminals charged battery would cause enormous current flow just entire bottom water tank removed once resulting inevitably tremendous flow water Thus amount water flow dependent both depth water overhead tank external condi tions pipe water load Elec trical current similarly dependent available battery voltage load resistance connected battery Putting water tank requires work Consider filling tank bucket time Up ladder Thats work has carry water against pull gravity get tank higher tank work effect work done imparting stored energy water Just simple fact water tank has elevation means water has potential energy Similarly charged model battery has stored energy model battery charged car battery energy ultimately came gasoline fueled auto engine turned alternator charged car battery Work done Like given size water tank Electric model battery big can hold its fill Think about concepts next month well get basic ideas can apply Well take look multimeters work use what readings mean few basics under belt youll have much better understanding things Electricsuch motor/bat tery circuit plane charger works should find hobby enjoyable fact its partly just kind question get incoming mail has prompted 'minilesson' basic electricity Let close acknowledgement some reader response earlier col umn Way back November 1984 issue offered no-rules approach getting simple Electric competition off running As part argument voiced model size power system makeup matter much fact Electrics will perform similarly independent size power-system makeup still maintaln position However same time must candor recognize matter degree reader has pointed out large planes fly better small onesthis based Reynolds number having nothing Electric pow er other power source Thus can argue Giant Scale flies better Peanut Scale context agree Secondly another reader called California point out large glider can seen farther small plane thus flight time can potentially longer former Having just gotten trifocal glasses couldnt agree still say let anything Electric fly early competitions After what pur pose served having book full Electric competition rules no interest ed able participants participant must come first Suppose right now national AMA set Electric competition rules governing size motors batteries whatever Can tell very active Elec tric enthusiast could go fly Elec tric contest Any reader comments questions can sent SASE please author meantime Happy Landings Bob Kopski 2S West End Dr Lans dale PA 19466 writing advertisers mention read about thorn Model Aviation RC Helicopters/Jolly Continued page 52 nal except tail-rotor assembly spection leads believe Kavan Kavan copies also suspect strong Kavan influence throughout de sign note anti-clockwise rotation rotor Also note super-looking flybar less rigid rotorhead now have set Sitars rotor blades epoxy fiberglass over blue foam incredible weigh 150 grams much stronger truer conventional wood blade Rick told machines available completely finished ra dio choice installed Im supposed see Bell 222s firsthand January can bet full report will follow months three-view all-time favorite helicopter Sikorsky S-67 Blackhawk following Military Helicopters World high-speed helicopter gunship developed Sikorsky private venture response Vietnam combat experience Some Blackhawks features based Sikorsky S-66 entry US Armys 1965 competition Advanced Aerial Fire Support System AAFSS well flight experience S-61 F compound helicopter De sign S-67 began August 1969 sole Blackhawk built flew first time exactly year later Although touted highly maneuverable gunship Blackhawk could employed troop carrier well style later Soviet Mi-24 Hind Designed outset gunship Blackhawk all-metal semimon ocoque fuselage narrow cross sec tion pilot copilot/gunner seated tandem forward beneath single Plexiglass canopy As troop carrier main fuselage cabin could divided two levels upper deck seating 15 troops lower section housing fuel ammunition Continued page 140 1 38 Model Aviation Rear 3405 Cleveland Ave SW Canton OH 44707 Phone 216 484-6810