RC Electrics in Europe

YESTERDAY friend told following story Model aircraft electric motors will go up very slowlyat edge perform ance After batteries dead model will some 350 ft will come down after couple circles above field opinion about electric flight quite some years very little change thought matter batteries visited international contests Belgium competely different picture presented Motorgliders went up within minute 900 ft multi-channel models flew same pattern 60 combustionengine models did few years ago Noiseless Pylon models flew standard AMA Formula course 100 mph 120 sec less Stand-off Scale models did thing front very serious judges couldnt speak anymore What happened Better batteries No sir flew standard 1200 mAb Ni-Cdsthe same types used us home giving such poor result motors Sure nearly participants used Keller Geist motors what could giving couple hundred percent efficiency batteries bad Some basic information normal-type sintered Ni-Cd cell used Electroflight capacity 12 ampere-hours weighs some 16 oz has potential 12 volts calcu late energy such cell come result such cell could reach altitude 33000 feet t its own energy such energy chemical should transformed another kind energy Trans forming energy always gives some losses losses eventually will bring actual altitude could reached cell much realistic value Lets have closer look electrical energy has transformed Therefore need electric motor energy has changed via propeller velocity need something carry motor battery preferably something low air resistance 72 Model Aviation international Electroflight contests Europe saw quite variety models powered Sailpianes Pattern jobs good-sized Scale models model airplane fuselage would just fine guide experimental aircraft could use pair wings stab also model airplane wings also give us opportunity glide long time hope after air craft has lifted its maximum altitude attributes have certain weight have add weight battery thats reach much lower altitude practical example glider has weight 6 lb much weight battery 14 times 16 oz equals 224 oz So now theoretcial maximum ceiling will 9000 ft very good indeed did speak about efficiency system yet general will get 30% rest energy will transformed air resistance model beat motor battery just have stay 9000 x 3 2700 ft Yes friend what reach Electroflight Gliders days energy June 198273 EICUUU uigani U5U5 six meoucni OQU molors ruouc eeau, engine on-off controls urpiarie rues nUIEC fl LJ ntijtr elevator ailerons mojor control Seen European meet ounhr-scale oronco uses iwo 1-aulnaoer moTors crevajor anu ailerons fighter Weighs 16 lb really II spans 100 flies 42 cells p0..ing two Keller 50/48 motors has retracts Piper Cherokee weighs 77 lb spans 63 Engine Keller 50/24 battery 20 cells Turns 1 25-5 prop Scale model Electroflight spans 12ff weighs 106 lb Keller 50/30 motor 28-cell battery models capaie ot tiying tne tun battery packs 20 24 cells Props 106 Inree use Keller 50/24 motors like country will consumed about 25 minutes gives us climbing speed some 17 ft/sec net energy 150 watts 500 watts available electrical current voltages about 30 amperes information possible compute what will bring us 1% less efficiency system 9000 x 01 t climbing height less also true weight change 3 oz will give difference altitude 100 ft less give idea relationship between energy battery weight climbing height importance low total weight high efficiency system again need build aerodynamically-clean models fancy stuffjust functionality first models maybe too heavy missed knowledge understanding concerning relationships trade-offs tween differnt forms energy course another reason todays good flight results due samarium-cobalt motors which1 give same weight nearly double power output efficiency least 10% higher electric motors classic magnet materials certainly im portant contests weekend fliers however would say very acceptable performances reasonable climb ceilings about 1500 feet available standard motors Did get clue very easy waste energy electric-powered model aircraft just using prop quantity cells fuselage Present Status Electric-Powered RC Models Europe European Electroflight fliers lucky ones have local Electroflight contests country also have much-attended international events organized different countries Switzer land year 9th time Belgium 7th time West Germany 5th time Its obvious such occasions could collect useful information about did planning discuss electric-powered airplane always have include what prop cells quantity capacity motor uses will talk about various subjects order Propellers electric flight matter very different what have known until now ones frequently used Top Flite Taipan Graupner have good efficiencygood direct-driven props wants go reduction gear Electroflight Glider because prop larger diameter has lower speed higher efficiency come other types propsthe folding ones widely used Geist 190/400 has very large yellow epoxy blade based experience rubber-powered models can used applications weekend flying up contest work also Scale Electroflight Gliders like Fournier RF-5 have Carrera 91040 prop very popular among sport fliers because has very good efficiency used conjunction 10 cells 1200 mAb Mabuchi 550 74 Model Aviation mis isa demo model trom Keller major motor manusacturer weigns 11 lb flies Keller 100/35 motor carries 38 cells Just show big Keller iucell snip nere 5 renz fte.I connecting up battery pack real show stopper Top Flite maple prop used make homemade folding pro pellerfora motorglider 120 span Keller 50/24 motor 16 cells Helmut Schenk displays Solarglider Cells wing provide direct power motor Solar cells cost lot Europe motor having 31 reduction However widely-used prop banana blade prop Robbe No4012 prop inexpensive can also reworked very easily other dimensions gives satisfaction contest fliers including Scale However experimenting goes year will certainly see various new designs Ni-Cd batteries sintered Ni-Cd cells used electric-powered flight Europe 1200 mAh variety 99% time because research has made clear cells have best power-to-weight ratio Cells used General Electric type GCR 10 STselected Sanyo SCF SCT SCR types Panasonic P 120 SCP Therefore say cells Europe means cells capacity Linger wooden props often carved adapt folding prop hubs 1200 mAh Just four years ago quite possible win international Electroflight contest 10 cells days best results contests come using 20 24 26 cells reason easy understand since energy needed gain altitude adjustable either number cells used increas ing current Nowadays currents up 30 amperes frequently used out win contests commonly used 25 amperes As watts dimension indicate power available want watts available model get necessary multiply volts amperes dont want go higher amperesbecause sintered cells cannot stand currents anymoreyou just go up voltageie number cells way read cells could well read volts because flight voltage cell drops volt makes calculations much easier Just rememben cell volt volt cell Motors Next importance battery electric motor As said earlier samariumcobalt versions certainly have edge standard-magnet motors lower weight Except Mabuchi Sagami motors have three important electric motor manufacturers Keller Geist Robbe Thanks competition come up now new better versions high-quality motors now widely used over world latest development use sleeves slide oft motor housing change magnetic field thus characteristics motor product very high demand because can use several motor tailor motor output depending use such motor different sleeves can adjust power plane quantity cells want fly means such motor can used power 20 glow engine can also swing 10 x 6 Pattern ship fly full AMA pattern motor fits nearly need electric motors lot less sensitive bad landing dirt high temperatures glow engines can understand real value money way same motors can also equipped reduction gear multiplies uses two case mentioned technique building good electric motor calls small gap possible between armature magnets have motors gap small 1mm can easily understand no cooling air will pass through armature turning full rpm latest motors fully-closed type no cooling holes front cover models used fly electric varied other kind model airplanes accompanying pictures will show look less expensive motors using up 10 cells nearly always have balsa fuselages built-up wings exception new Carrera Lift 1001 has plastic fuselage foam/balsa-covered wing other models use epoxy fuselages very often foam/woodcovered wings mainly because weight cells puts real strain balsa landing models become available Continued page 137 June 198275 yellow Geist prop blade has avail able since 1978 mounted prop diame ter 16 inpitch 8 Three blades sport powered gliders up 120 span Top bottom Carrera 92040 Robbe 4012 Graupner 191 Homemade blade holders made ap propriate pitch modeler experiments find best blade Ruler centimeters Thomas Levin West Germany developed homemade 18-9 folding prop Motor glider flies Keller motor 24 cells Some European motors have interchangeable sleeves allow altering characteristics magnet different applications Keller 50/24 SL motor sleeve Geist 60I2l motor also uses interchange Robbe motors also use sleeves able sleeves two sleeves mounted change magnets available motor bodyeach about 2mm thick large quantities Europe Geist sells gear reduction system 40/14 motor Ball bearings precision machining keep friction down AIIISCIIUi% PRESENTS BALSA STRIPPER A95 AT YOUR DEALER PRECISION STRIP WOOD TO NS FROM BALSA SHEET ALSO FOR DRAFTING AND PHOTO MATS USES TYPE II BLADE SUPER TOOLGREAT PRICE WINDSOR PROPELLER CO 384 Tesconi Ct Santa Rosa CA 95401 LEADER IN SMALL AIRFOIL TECHNOLOGY MASTER AIRSCREW M~SIV b~LSVflK PcIASTER IMPROVED THROUGH FOUR YEARS OF PRODUCTION THE GIF SERIES IS UNEQUALED FOR PERFORMANCE & DURABILITY AVAILABLE WORLDWIDE THROUGH 131 DISTRIBUTORS WINDSOR PROPELLER CO 384 Tesconi Ct Santa Rosa CA 95401 higher wide left-hand turns Pylon models usually unstable turning left under power dont unusual characteristic has shown up ship frankly dont care very muchI just let climb wide lefthand circles enjoy results first two flights 6 x 3 Cox Tee-Dee prop mounted backwards old Free Flight trimming trick cut down thrust speed gross adjustments engine Frankly after first flights adjustment required turn prop around first launches trim everything neutral transmitter airplane model very forgiving wants fly let climb away control inputs after launching unless something really gross develops will probably take three four flights before will safe pre-set trims transmitter just set transmitter ground launch airplane using both hands has become normal ship now fact after pre launch control check antenna retracted usually go ahead throw thing go back extend antenna pick up transmitter sort looks like Ive showing off Im really airplane stable will allow sort thing firfldo PROPELLERS Made polyester boil color Go GRISH 1 propeller True helical pitch airfoil Sizes pitches styles AT YOUR DEALER 2 Blade Tractor 53each 5-45 35-4Nc 6364USc 747-678Nc 84868-8Nc 9-49-69-7 9810-4106Nc needs 11411-6118 1 12412-51264150 2 Blade Pusher 5446-36-4SOc 8-6Sc 9-610-6*1 3 Blade Tractor 5-36-364 USc 3 Blade Pusher 6-3SOc 3 Blade Metallic Aluminum Color Tractor /678 1 8688ia 96 106104*150 Pusher106*150 win-power Maximum altitude gained climb control inputs kept minimum try keep plane climbing less wind what looks like good rate speed will established experience anything else cautiondont let nose get high airspeed falls off starts hang prop Keep feeding down trim little time until under-elevates starts nose over will evident dramatic increase airspeed trim just tad up elevators watch carefuly recovers continues upward Meanwhile course keep twiddling rudder trim keep pointed upwind watch wing wobbles may indicate going area lift machine true its Free Flight nature glides slowly smoothly bounces wing shakes indicate turbulence wobbles little circles pay close attention looks like its going up make another circle see wings rock again youre thermal Tighten up glide circle trim sit hack enjoy ride plane goes downdraft will evident almost immediately get out particular area trimming nose down GRISH LARGE WOOD PROPELLERS HARDWOOD too hard minimizes chance Costly plane engine damage True pitch airfoil fully finished balanced ready coating 3/8 BOREALL SIZES IN18 $7 68 10 12 PITCH 20 8 22 10 24 13 letting haul itself friendlier skies down draft spot good indication lift nearby though dont go far slowing down feeling around area Thats about advice can give sin cerely hope enjoy Strato-Streak much have Electrics Blommaart Continued page 75 Electroflight places battery electric motor mind Often have pan hold battery fixed under fuselage can removed screw pops right off case mishap first designs ventilation holes June 1982 137 IN STOCK FOR IMMEDIATE SHIPMENT NewaaSUPERQUADRAr$9995 wth BRISIGHELLA FLYWHEEL611995 OUADRA MARINE eflgnR$12495 OUADRA REPAIR$1000 pIes parts KIORITZ engine 244 Cu fl619995 iin Manse ERCOUPEPIANS 82395 KIT $22998 Jin Masse TOMAHAWKPLANS 82395 KIT 623995 BALSA BASSWOOD siansl35% OFF Concept FLEETKIT 617995 FO Cowl 81995 OUADRA faIn tanksie 5695 32 8795 VICKERS LEWIS MACHINE GUN KITS61495 10 die COVERED WHEELS USA Pap82995 PLANSS SUPER STEARMAN GedfresS2B0O STARDUSTER TOO Briaghella62995 / scale 43 CUB INalita62998 VOLKSPLANE Chicken Charlie$2195 FLY BABY 61595 SES Reoschl62498 COCKPIT KITS Tonehesnk F4U-1 Spitfire82195 Ercoupe $1795 Stearrean 82095 Citahrie 62495 13 Cab 61950 ME-109 $2180 Fleet $1995 FIBERGLASS ARROW SHAFTS 8/15 o32 1g8/SlOOS 24-Hour Service $250 postage Send Bank Check Money Order JIM MESSERS QUALITY MODEL PRODUCTS 106 Valley View Dr Allegany NY 14706 RIGHT HAND TRACTOR G RUSH BROSINDIANA 46373 NEW SIZE IN 8 & 10 PITCH 26 $16 18 az/sq yd Shrinkable Easy apply Extremely strong Dope doesnt run through like silk 66 VOde Iyd$596 3IIdoOl5O 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initially thought Since 198 1 more Electroflight planes available no longer have cooling holes front fuselage pilots prefer take batteries out plane after flight assure better cooling turn gives better charge Whenever someone wants duct cooling air model should directed right brushes nowhere else Contest models average Electroflight Glider contest purposes has span 110 120 Training fun flying can done 14 cells contests use 20 cells must contest motor run should short possible20 40 sec takes altitude 700-800 ft As FAI Electro flight contest allows two motor runs energy aboard should used inat mostSO 100 sec still power left after time youd better add some cells props used often standard props like Zinger Top Flite Graupner 12 x 6 16 x 8 have made foldable Special design ones also very often seen Motor throttling should waste power therefore use volteontollers efficiency much 97% more common voltcontollers can control motor gradually 0 up full rpm have advantage whole power group suffers less motor switched off power available battery Best Ducted Fans SKYRAY F4D1 6I3~__ Plan Form SKYRAY NAVY P4D1 ale Dacted Fa R/G Fo RK-25 Fa Uct44 ocg Plac Set RCDF-t Slees WE TECHNICAL SERVICES Box 76884-A Atlanta Georgia 30328 used much better know level flight needs much less power first climb altitude motor switch possible throttle back has try fly level elevator Acrobatic models Pattern models classic Gliders carry between 20 24 cells nearly always use 10 x 6 lOx 7 propellers field has concrete runway common see take off ground Probably 98% Pattern models use Keller 50/24 24X motor powerful market today too expen sive other type used Geist 60/28 has same power output higher price tag 138 Model Aviation P0 Box 3957 Torrance CA 90510 CORRECTION Roush Mfg ad page 98 May issue ModelAviation incor rectly listed phone number Correct number Roush Mfg 216-484-6810 3-FUNCTION ACCU-TACH O LCD Tachometer widual scale capabilily lOX bOX @ Digilal Volimeler cs~ 4 wilhoul load forES/I checkingscycling TX RX battery combosACCLIrACH7// Montlor quick- rg ing operation15 5 79prepaid 95\ iVorSend check money order no Calif residenis AVIONIC3S add 6% lax P0 Box 70956 Sunnyvale CA 94086 CUSTOM TUNED ENGINES COMPETITION 4CCESSORIES Specialists custom TD 049/05 1 reed engines Throttled TD available Complete Inventory Individual stock custom parts Cox TD 020 049 081 & 09 engines Exclusive distributor Nelson 15 engine parts Hard-to-get Items such custom needle valves racing wheels quick fuel shut-a fis solid control lInes others detailed brochure send 25 cents Kustom Kraftsmanshlp Box 2699 Laguna Hills CA 92653 Ph 714 830-5162 RUBBER STRIP FAI RUBBER Made USA SIZES 1/4 3/16 1/8 3/32 1/16 1mm thick 042 BOXED 16 ounces rubber per box PRICE $1200 per box postpaid USA NEW PIRELLI SIZES 6mm 3mm 1mm thick PRICE $1800 per hankapprox 1/2 kgj TIMERS KSB Fuel DT $1150 ea plus 10% UPS Sole US Distributors & World-wide Sales Send 25 1981 catalog Sup ply {CFULL*SE*PLANS 369 Super Star$550 CL Semi-scale Stunter 35-power beauty No 370 CAP-21$1400 RC Giant Scale version French aerobatic craft Quadra-power Two plan sheets documentation sheet Spans 7 ft No 371 Strato-Streak$500 RC Old-Timer version Garamis famous 41 FF design half-A power 2-chor build FF1 No 131Gee Bee Model Y 40-powered BC stand-off scale great old-time racers $500 No168Simitar RCA spectacular flying wing 15 nose-mounted tractor $300 No 225Ole Reliable RC 70 version 38 old-timer REM controls 19-25 $425 No 239Blue Birds RC Ken Willards formation plane 4-ch 10S375 No 253Mitchell B-25 RC 4-ft AA twin Ace foam panels Well-behaved $350 No 259chembermaid FF Bill Henes superlative rubber-powered scale winner $200 No 260Waco custom cabin RC Don Srulls scaler 15-20 REM controls $400 No 262creshmasger CL Crash-proof trainer 2 sizes15-30 35-40 $125 No 291cap 20 40-powered scale RC French acrobatic plane Low wing tail dragger 2 sheets 0 No 299GeeBee Sr Sportster RC -scale Haffke 81 power Prototype span 30 ft 2 sheets $1175 No 302Mini F-16 RC Sarpolus 049 dacted fan sport flier 2-ch Balsa wings tail fuse structure $275 No 307Pegeaus RC Watsons giant super sailplane features flaps spoilers T-tail 166 wingspan $675 No 309Super Brigadier RC Don Mathews update theSOs favorite Easyflying 3-nh for1 8- 25-power $475 No 3101930 Fleet Biplane RC Sport Scale 35-40 4-nh Wingspan 56 in. 1/6 scale Two sheets $625 No 314Drake II RC Ken Willards flying boat 3-nh 15-power Fly land removable gear$375 No 317SchweizerTG3-A RC Sport Scale Sailplane Jack Hiner has 11-ft span 3-nh Two sheets$1200 No 315Dirt Stripper RC Sport flier 18-40 3-nh Rugged tail-dragger rough fields $300 No 321TC Two CL Sport Stunt twin 20s features tricycle gear profile fuselage Sarpolus $425 No 322church Midwing RC-scale Rosenstock 60-power Prototype spans 26 ft 2 sheets$1000 No 323Super Voodoo CL Fast Combat John Jo features built-up wing fast construction wins $300 No 325commodom RC Tecaco-class Old-Timer Oslan updates Shereshaws classic 3-nh 28-power 2 sh$1000 No 326Taylor cub RC Don Srulrs Schoolyard-Scale 048s 2-3 ch Spans 50 iv $350 No 328Bristol ScoutDRC lltzschs Precision Scale -sizespan 73 bipefor81 power4 sheets$1650 No 330Stitchin RC Randolphs advanced trainer 4-nh 1 0-1 5-power Variable stability features$375 No 332Zephyr RC Small 2-nh glider hand-launch tow thermal slope soaring$200 No334T-3 Mostly-foam-board 3-nh trainer 18-40 power Rugged Three sheets$850 No 335Sopwith Dolphin FF Bill Noonans Jumbo-Rubber scale great WW I-vintage biplane $175 No 337Super Akro-1 chips RC Scale-like stunter 5-ch 1 smoke valve 40-power 2 sheets $700 No 338Rearwin Jr RC Don Mathews Sport Scale 4-nh 40-power Monoplane$525 No 340Mossie Stunter CL Twin 35-powered semi-scale based famous WW II Mosquito bomber $400 No 341Brown B-2RC Scale-like sport flier 4-nh l9-28-pomer Rune Quickee hot 25 $500 No 342crosswind RC Bill Evans semi-sailplane 3-nh. 19-power $350 No 343Weep VI FF Mike Stoys Nuts-winning Outdoor HLO $1 00 No 344Misty CL Scale Racer Class II Also fly Mouse just sport $100 No 345La JolitaCL Scale Racer Class II also sport Mouse $100 No 346Rivets CL Scale Racer Class II also sport Mouse $100 No 347Space Shuttle RC Sport-Scale glider 2-nh. launch mother plane $1 75 No 348Onestep RC Trainer has very forgiving flying qualities 3-nh 1 0-25 power$425 No 349Davis D-1K FF Scale flying outdoors CO-2 power Spans 21 $175 No 350Electric Spitfire BC Fun-Scale 15/25 electric 20/30 glow 3-nh. spans 6 ft $750 No 351Dakota Grende RC Easy-flying bipe 60-power 4-nh. scaled-up 1850 FF$625 No 352Waltting Matilda FF Wakefield Rubber placed 2nd 1875 FF Champs $175 No 353Sanitation CL Sleek 46-powered super-Stunter contest-proven $400 No 354Merlyn BC Giact 155-in span Sailplane uses 3 BC channels $750 No 355 Santos-Dumont 14-bis BC Sport-Scale canard bipe for1 5-power 3-nh spans 56 iv 2 sheets. $575 No 356Meule Lunar Rocket BC -Scale spans 825 5-nh flaps 12 ca engine$1200 No 357SB-B CL Sport-Scale power Biplane WW I-type$200 No 358Pieces FF Indoor Easy B Rubber-power contest-winner W Van Gorder$100 No 359Black Widow RC Fun-Scale twin two lOs 4-nh BC spans 55 WW IInight fighter$675 No 360Dragon CL Slow Combat winner has foam wing uses 36-power$500 No 361Electric country Boy FF Record-holding duration craft 02 motor$200 No 362Supercat BC Half-A Pylon Racer/sport flier Aileron elevator control Foam wing$200 No 363Tiger Rag CL Sport Stunter biplane 36-power$400 No 364Neutron Star BC Sleek 40-size Pattern flierwith tail draggerretracts enclosed pipe built-up$525 No 365Seamaster RC Willards 40-size flying boat for4-ch Strap-an gearmakes landplanel 2 sheets$1100 No 366Truant FF Pert all-balsa beginners sport model 020-power$225 No 367P-39 Airacobra CL Sport-Scale uses water-cooled 45 engine mounted aft euteesios shaft $1275 No 368Space Shutffe II BC Larger improved version Hay glider 3-nh$550 eeeOe@ggOege@@eeo.e@@@OOO@eOS Circle numberss plans wish order 131168 225 239 S 0 0 0 0 0 285291299302 322323325326 340341342343 351352353354 362 363 364 365 0 Please print carefully 253259260262269278282 307309310314317318321 328330332334335337338 344345346347348349350 355356357358359360361 366367368369370371 Enclosed $_______________ S NAMF 0 STREET 0 CITY 0 0 0 0 0 0 0 0 0 S S 0 0 0 0 0 STATE ________________________________ ZIP____________ Price includes first-class postage Send check money order payable Model Aviatiort AMA 815 Fifteenth St N W washington Dc 200050 0000000 060000000000 000000000600 Fun models Any electric motor can used fly model combination prop cells motor right model things want Thats can see kinds fun models kinds com binations year September biggest gathering Electroflight models will take place Amay Belgium European Championships FAI class F3E 1984 first F3E World Championships planned suggest youd better prepared Hank Clark Continued page 76 DeGrosa Don Srull etc craft out beauty after another feel privileged greeted guys like hear Gosh man drawings Bill Winter picked work MA Ive awe sinceespecially AMA HQ MA editorial offices located get monthly pages such spartan facilities own models manybut Scale display mostly plastics dont build RC model Dont ask Id passionately love start layout -scale Curtiss Falcon 0-1 first military plane ever photographed Mitchell Field 1932 Like life love But--hear 67 have projects lined up till theyre way above head Since V-J day after Grumman went free-lance designed 12 hand-built eight boats rebuilt two houses scratch-built lake house recovered Cub Enough work three men now 1982 wouldnt believe dont Before go North now have paint Jersey home finish roof shingles pour some cement slabs replace some plumbing syndicated workshop art New York News MA cutaways other art paintings lots 35mm darkroom work family visit seven grandchildren write-up MA asked say few words fly Super Cub stay current skate new rollers get tools ready take lake weekend just spread three truckloads fill raised lawn summer whole routine Ijust rattled off begins over again lake addition get house working order repair plumbing hurt winter get three boats out under repair dock some winterdamage help son fix license famous Art Cub start building surf sailer windsurfer paint canoe built last year repair add cement block foundation finished last year add back sun porch paint house family visits help water ski skin dive sail sunfish row shell work Cub hope flying see now lake house also needs new roof shingling after 20 years theres. - oh what saying about building Radio Control model Editors note article would have longer author Hank Clark found wife typewriter staring vacantly out window has revived yet wife sent unfinished manuscript 140 Model Aviation S Full-size Plan List Available complete listing plans previously published magazine through No 364 may obtained free charge writing enclose stain ped pre-addressed businesssize envelope Model Aviation 815 Fif teenth St NW Washington DC 20005

YESTERDAY friend told following story Model aircraft electric motors will go up very slowlyat edge perform ance After batteries dead model will some 350 ft will come down after couple circles above field opinion about electric flight quite some years very little change thought matter batteries visited international contests Belgium competely different picture presented Motorgliders went up within minute 900 ft multi-channel models flew same pattern 60 combustionengine models did few years ago Noiseless Pylon models flew standard AMA Formula course 100 mph 120 sec less Stand-off Scale models did thing front very serious judges couldnt speak anymore What happened Better batteries No sir flew standard 1200 mAb Ni-Cdsthe same types used us home giving such poor result motors Sure nearly participants used Keller Geist motors what could giving couple hundred percent efficiency batteries bad Some basic information normal-type sintered Ni-Cd cell used Electroflight capacity 12 ampere-hours weighs some 16 oz has potential 12 volts calcu late energy such cell come result such cell could reach altitude 33000 feet t its own energy such energy chemical should transformed another kind energy Trans forming energy always gives some losses losses eventually will bring actual altitude could reached cell much realistic value Lets have closer look electrical energy has transformed Therefore need electric motor energy has changed via propeller velocity need something carry motor battery preferably something low air resistance 72 Model Aviation international Electroflight contests Europe saw quite variety models powered Sailpianes Pattern jobs good-sized Scale models model airplane fuselage would just fine guide experimental aircraft could use pair wings stab also model airplane wings also give us opportunity glide long time hope after air craft has lifted its maximum altitude attributes have certain weight have add weight battery thats reach much lower altitude practical example glider has weight 6 lb much weight battery 14 times 16 oz equals 224 oz So now theoretcial maximum ceiling will 9000 ft very good indeed did speak about efficiency system yet general will get 30% rest energy will transformed air resistance model beat motor battery just have stay 9000 x 3 2700 ft Yes friend what reach Electroflight Gliders days energy June 198273 EICUUU uigani U5U5 six meoucni OQU molors ruouc eeau, engine on-off controls urpiarie rues nUIEC fl LJ ntijtr elevator ailerons mojor control Seen European meet ounhr-scale oronco uses iwo 1-aulnaoer moTors crevajor anu ailerons fighter Weighs 16 lb really II spans 100 flies 42 cells p0..ing two Keller 50/48 motors has retracts Piper Cherokee weighs 77 lb spans 63 Engine Keller 50/24 battery 20 cells Turns 1 25-5 prop Scale model Electroflight spans 12ff weighs 106 lb Keller 50/30 motor 28-cell battery models capaie ot tiying tne tun battery packs 20 24 cells Props 106 Inree use Keller 50/24 motors like country will consumed about 25 minutes gives us climbing speed some 17 ft/sec net energy 150 watts 500 watts available electrical current voltages about 30 amperes information possible compute what will bring us 1% less efficiency system 9000 x 01 t climbing height less also true weight change 3 oz will give difference altitude 100 ft less give idea relationship between energy battery weight climbing height importance low total weight high efficiency system again need build aerodynamically-clean models fancy stuffjust functionality first models maybe too heavy missed knowledge understanding concerning relationships trade-offs tween differnt forms energy course another reason todays good flight results due samarium-cobalt motors which1 give same weight nearly double power output efficiency least 10% higher electric motors classic magnet materials certainly im portant contests weekend fliers however would say very acceptable performances reasonable climb ceilings about 1500 feet available standard motors Did get clue very easy waste energy electric-powered model aircraft just using prop quantity cells fuselage Present Status Electric-Powered RC Models Europe European Electroflight fliers lucky ones have local Electroflight contests country also have much-attended international events organized different countries Switzer land year 9th time Belgium 7th time West Germany 5th time Its obvious such occasions could collect useful information about did planning discuss electric-powered airplane always have include what prop cells quantity capacity motor uses will talk about various subjects order Propellers electric flight matter very different what have known until now ones frequently used Top Flite Taipan Graupner have good efficiencygood direct-driven props wants go reduction gear Electroflight Glider because prop larger diameter has lower speed higher efficiency come other types propsthe folding ones widely used Geist 190/400 has very large yellow epoxy blade based experience rubber-powered models can used applications weekend flying up contest work also Scale Electroflight Gliders like Fournier RF-5 have Carrera 91040 prop very popular among sport fliers because has very good efficiency used conjunction 10 cells 1200 mAb Mabuchi 550 74 Model Aviation mis isa demo model trom Keller major motor manusacturer weigns 11 lb flies Keller 100/35 motor carries 38 cells Just show big Keller iucell snip nere 5 renz fte.I connecting up battery pack real show stopper Top Flite maple prop used make homemade folding pro pellerfora motorglider 120 span Keller 50/24 motor 16 cells Helmut Schenk displays Solarglider Cells wing provide direct power motor Solar cells cost lot Europe motor having 31 reduction However widely-used prop banana blade prop Robbe No4012 prop inexpensive can also reworked very easily other dimensions gives satisfaction contest fliers including Scale However experimenting goes year will certainly see various new designs Ni-Cd batteries sintered Ni-Cd cells used electric-powered flight Europe 1200 mAh variety 99% time because research has made clear cells have best power-to-weight ratio Cells used General Electric type GCR 10 STselected Sanyo SCF SCT SCR types Panasonic P 120 SCP Therefore say cells Europe means cells capacity Linger wooden props often carved adapt folding prop hubs 1200 mAh Just four years ago quite possible win international Electroflight contest 10 cells days best results contests come using 20 24 26 cells reason easy understand since energy needed gain altitude adjustable either number cells used increas ing current Nowadays currents up 30 amperes frequently used out win contests commonly used 25 amperes As watts dimension indicate power available want watts available model get necessary multiply volts amperes dont want go higher amperesbecause sintered cells cannot stand currents anymoreyou just go up voltageie number cells way read cells could well read volts because flight voltage cell drops volt makes calculations much easier Just rememben cell volt volt cell Motors Next importance battery electric motor As said earlier samariumcobalt versions certainly have edge standard-magnet motors lower weight Except Mabuchi Sagami motors have three important electric motor manufacturers Keller Geist Robbe Thanks competition come up now new better versions high-quality motors now widely used over world latest development use sleeves slide oft motor housing change magnetic field thus characteristics motor product very high demand because can use several motor tailor motor output depending use such motor different sleeves can adjust power plane quantity cells want fly means such motor can used power 20 glow engine can also swing 10 x 6 Pattern ship fly full AMA pattern motor fits nearly need electric motors lot less sensitive bad landing dirt high temperatures glow engines can understand real value money way same motors can also equipped reduction gear multiplies uses two case mentioned technique building good electric motor calls small gap possible between armature magnets have motors gap small 1mm can easily understand no cooling air will pass through armature turning full rpm latest motors fully-closed type no cooling holes front cover models used fly electric varied other kind model airplanes accompanying pictures will show look less expensive motors using up 10 cells nearly always have balsa fuselages built-up wings exception new Carrera Lift 1001 has plastic fuselage foam/balsa-covered wing other models use epoxy fuselages very often foam/woodcovered wings mainly because weight cells puts real strain balsa landing models become available Continued page 137 June 198275 yellow Geist prop blade has avail able since 1978 mounted prop diame ter 16 inpitch 8 Three blades sport powered gliders up 120 span Top bottom Carrera 92040 Robbe 4012 Graupner 191 Homemade blade holders made ap propriate pitch modeler experiments find best blade Ruler centimeters Thomas Levin West Germany developed homemade 18-9 folding prop Motor glider flies Keller motor 24 cells Some European motors have interchangeable sleeves allow altering characteristics magnet different applications Keller 50/24 SL motor sleeve Geist 60I2l motor also uses interchange Robbe motors also use sleeves able sleeves two sleeves mounted change magnets available motor bodyeach about 2mm thick large quantities Europe Geist sells gear reduction system 40/14 motor Ball bearings precision machining keep friction down AIIISCIIUi% PRESENTS BALSA STRIPPER A95 AT YOUR DEALER PRECISION STRIP WOOD TO NS FROM BALSA SHEET ALSO FOR DRAFTING AND PHOTO MATS USES TYPE II BLADE SUPER TOOLGREAT PRICE WINDSOR PROPELLER CO 384 Tesconi Ct Santa Rosa CA 95401 LEADER IN SMALL AIRFOIL TECHNOLOGY MASTER AIRSCREW M~SIV b~LSVflK PcIASTER IMPROVED THROUGH FOUR YEARS OF PRODUCTION THE GIF SERIES IS UNEQUALED FOR PERFORMANCE & DURABILITY AVAILABLE WORLDWIDE THROUGH 131 DISTRIBUTORS WINDSOR PROPELLER CO 384 Tesconi Ct Santa Rosa CA 95401 higher wide left-hand turns Pylon models usually unstable turning left under power dont unusual characteristic has shown up ship frankly dont care very muchI just let climb wide lefthand circles enjoy results first two flights 6 x 3 Cox Tee-Dee prop mounted backwards old Free Flight trimming trick cut down thrust speed gross adjustments engine Frankly after first flights adjustment required turn prop around first launches trim everything neutral transmitter airplane model very forgiving wants fly let climb away control inputs after launching unless something really gross develops will probably take three four flights before will safe pre-set trims transmitter just set transmitter ground launch airplane using both hands has become normal ship now fact after pre launch control check antenna retracted usually go ahead throw thing go back extend antenna pick up transmitter sort looks like Ive showing off Im really airplane stable will allow sort thing firfldo PROPELLERS Made polyester boil color Go GRISH 1 propeller True helical pitch airfoil Sizes pitches styles AT YOUR DEALER 2 Blade Tractor 53each 5-45 35-4Nc 6364USc 747-678Nc 84868-8Nc 9-49-69-7 9810-4106Nc needs 11411-6118 1 12412-51264150 2 Blade Pusher 5446-36-4SOc 8-6Sc 9-610-6*1 3 Blade Tractor 5-36-364 USc 3 Blade Pusher 6-3SOc 3 Blade Metallic Aluminum Color Tractor /678 1 8688ia 96 106104*150 Pusher106*150 win-power Maximum altitude gained climb control inputs kept minimum try keep plane climbing less wind what looks like good rate speed will established experience anything else cautiondont let nose get high airspeed falls off starts hang prop Keep feeding down trim little time until under-elevates starts nose over will evident dramatic increase airspeed trim just tad up elevators watch carefuly recovers continues upward Meanwhile course keep twiddling rudder trim keep pointed upwind watch wing wobbles may indicate going area lift machine true its Free Flight nature glides slowly smoothly bounces wing shakes indicate turbulence wobbles little circles pay close attention looks like its going up make another circle see wings rock again youre thermal Tighten up glide circle trim sit hack enjoy ride plane goes downdraft will evident almost immediately get out particular area trimming nose down GRISH LARGE WOOD PROPELLERS HARDWOOD too hard minimizes chance Costly plane engine damage True pitch airfoil fully finished balanced ready coating 3/8 BOREALL SIZES IN18 $7 68 10 12 PITCH 20 8 22 10 24 13 letting haul itself friendlier skies down draft spot good indication lift nearby though dont go far slowing down feeling around area Thats about advice can give sin cerely hope enjoy Strato-Streak much have Electrics Blommaart Continued page 75 Electroflight places battery electric motor mind Often have pan hold battery fixed under fuselage can removed screw pops right off case mishap first designs ventilation holes June 1982 137 IN STOCK FOR IMMEDIATE SHIPMENT NewaaSUPERQUADRAr$9995 wth BRISIGHELLA FLYWHEEL611995 OUADRA MARINE eflgnR$12495 OUADRA REPAIR$1000 pIes parts KIORITZ engine 244 Cu fl619995 iin Manse ERCOUPEPIANS 82395 KIT $22998 Jin Masse TOMAHAWKPLANS 82395 KIT 623995 BALSA BASSWOOD siansl35% OFF Concept FLEETKIT 617995 FO Cowl 81995 OUADRA faIn tanksie 5695 32 8795 VICKERS LEWIS MACHINE GUN KITS61495 10 die COVERED WHEELS USA Pap82995 PLANSS SUPER STEARMAN GedfresS2B0O STARDUSTER TOO Briaghella62995 / scale 43 CUB INalita62998 VOLKSPLANE Chicken Charlie$2195 FLY BABY 61595 SES Reoschl62498 COCKPIT KITS Tonehesnk F4U-1 Spitfire82195 Ercoupe $1795 Stearrean 82095 Citahrie 62495 13 Cab 61950 ME-109 $2180 Fleet $1995 FIBERGLASS ARROW SHAFTS 8/15 o32 1g8/SlOOS 24-Hour Service $250 postage Send Bank Check Money Order JIM MESSERS QUALITY MODEL PRODUCTS 106 Valley View Dr Allegany NY 14706 RIGHT HAND TRACTOR G RUSH BROSINDIANA 46373 NEW SIZE IN 8 & 10 PITCH 26 $16 18 az/sq yd Shrinkable Easy apply Extremely strong Dope doesnt run through like silk 66 VOde Iyd$596 3IIdoOl5O 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Shop114 RAC Products135 RAM Inc105 R/C Kits136 RJL Industries133 RLF Products126 R&M Quarter Scale Specialist22 Radio Control Imports22 RadioSouth103 Repla-Tech International112 Roush Manufacturing Co94 138 Saf-Flite Models124 Sailplane Factory104 Satellite City139 Sheldons Hobby Shop47 Sig Manufacturing Co9 Bob Smith R/C Aircraft124 Sonic-Tronics127 Sterling Models99 Swanson Associates130 T&D Fiberglass Specialties110 THS Distributors94 Tatone Products12 Technopowerli114 Tower Hobbies128-129 Twinn-K Inc97 WE Technical Services125 138 Welty Industries96 Williams Brothers106 Windsor Propeller Co104 137 World EnginesBack dover CA Zaic Co107 Zenith Aviation Rooks13 131 ADVERTISERS INDEX ADVERTISERS INDEX ADVERTISERS INDEX ADVERTISERS INDEX intake exhaustfor cooling air Modern design takes advantage contest experiences became very clear air didnt really cool cells because battery started heating up after landing due fact heat comes very center cell has go outside walls takes timemuch initially thought Since 198 1 more Electroflight planes available no longer have cooling holes front fuselage pilots prefer take batteries out plane after flight assure better cooling turn gives better charge Whenever someone wants duct cooling air model should directed right brushes nowhere else Contest models average Electroflight Glider contest purposes has span 110 120 Training fun flying can done 14 cells contests use 20 cells must contest motor run should short possible20 40 sec takes altitude 700-800 ft As FAI Electro flight contest allows two motor runs energy aboard should used inat mostSO 100 sec still power left after time youd better add some cells props used often standard props like Zinger Top Flite Graupner 12 x 6 16 x 8 have made foldable Special design ones also very often seen Motor throttling should waste power therefore use volteontollers efficiency much 97% more common voltcontollers can control motor gradually 0 up full rpm have advantage whole power group suffers less motor switched off power available battery Best Ducted Fans SKYRAY F4D1 6I3~__ Plan Form SKYRAY NAVY P4D1 ale Dacted Fa R/G Fo RK-25 Fa Uct44 ocg Plac Set RCDF-t Slees WE TECHNICAL SERVICES Box 76884-A Atlanta Georgia 30328 used much better know level flight needs much less power first climb altitude motor switch possible throttle back has try fly level elevator Acrobatic models Pattern models classic Gliders carry between 20 24 cells nearly always use 10 x 6 lOx 7 propellers field has concrete runway common see take off ground Probably 98% Pattern models use Keller 50/24 24X motor powerful market today too expen sive other type used Geist 60/28 has same power output higher price tag 138 Model Aviation P0 Box 3957 Torrance CA 90510 CORRECTION Roush Mfg ad page 98 May issue ModelAviation incor rectly listed phone number Correct number Roush Mfg 216-484-6810 3-FUNCTION ACCU-TACH O LCD Tachometer widual scale capabilily lOX bOX @ Digilal Volimeler cs~ 4 wilhoul load forES/I checkingscycling TX RX battery combosACCLIrACH7// Montlor quick- rg ing operation15 5 79prepaid 95\ iVorSend check money order no Calif residenis AVIONIC3S add 6% lax P0 Box 70956 Sunnyvale CA 94086 CUSTOM TUNED ENGINES COMPETITION 4CCESSORIES Specialists custom TD 049/05 1 reed engines Throttled TD available Complete Inventory Individual stock custom parts Cox TD 020 049 081 & 09 engines Exclusive distributor Nelson 15 engine parts Hard-to-get Items such custom needle valves racing wheels quick fuel shut-a fis solid control lInes others detailed brochure send 25 cents Kustom Kraftsmanshlp Box 2699 Laguna Hills CA 92653 Ph 714 830-5162 RUBBER STRIP FAI RUBBER Made USA SIZES 1/4 3/16 1/8 3/32 1/16 1mm thick 042 BOXED 16 ounces rubber per box PRICE $1200 per box postpaid USA NEW PIRELLI SIZES 6mm 3mm 1mm thick PRICE $1800 per hankapprox 1/2 kgj TIMERS KSB Fuel DT $1150 ea plus 10% UPS Sole US Distributors & World-wide Sales Send 25 1981 catalog Sup ply {CFULL*SE*PLANS 369 Super Star$550 CL Semi-scale Stunter 35-power beauty No 370 CAP-21$1400 RC Giant Scale version French aerobatic craft Quadra-power Two plan sheets documentation sheet Spans 7 ft No 371 Strato-Streak$500 RC Old-Timer version Garamis famous 41 FF design half-A power 2-chor build FF1 No 131Gee Bee Model Y 40-powered BC stand-off scale great old-time racers $500 No168Simitar RCA spectacular flying wing 15 nose-mounted tractor $300 No 225Ole Reliable RC 70 version 38 old-timer REM controls 19-25 $425 No 239Blue Birds RC Ken Willards formation plane 4-ch 10S375 No 253Mitchell B-25 RC 4-ft AA twin Ace foam panels Well-behaved $350 No 259chembermaid FF Bill Henes superlative rubber-powered scale winner $200 No 260Waco custom cabin RC Don Srulls scaler 15-20 REM controls $400 No 262creshmasger CL Crash-proof trainer 2 sizes15-30 35-40 $125 No 291cap 20 40-powered scale RC French acrobatic plane Low wing tail dragger 2 sheets 0 No 299GeeBee Sr Sportster RC -scale Haffke 81 power Prototype span 30 ft 2 sheets $1175 No 302Mini F-16 RC Sarpolus 049 dacted fan sport flier 2-ch Balsa wings tail fuse structure $275 No 307Pegeaus RC Watsons giant super sailplane features flaps spoilers T-tail 166 wingspan $675 No 309Super Brigadier RC Don Mathews update theSOs favorite Easyflying 3-nh for1 8- 25-power $475 No 3101930 Fleet Biplane RC Sport Scale 35-40 4-nh Wingspan 56 in. 1/6 scale Two sheets $625 No 314Drake II RC Ken Willards flying boat 3-nh 15-power Fly land removable gear$375 No 317SchweizerTG3-A RC Sport Scale Sailplane Jack Hiner has 11-ft span 3-nh Two sheets$1200 No 315Dirt Stripper RC Sport flier 18-40 3-nh Rugged tail-dragger rough fields $300 No 321TC Two CL Sport Stunt twin 20s features tricycle gear profile fuselage Sarpolus $425 No 322church Midwing RC-scale Rosenstock 60-power Prototype spans 26 ft 2 sheets$1000 No 323Super Voodoo CL Fast Combat John Jo features built-up wing fast construction wins $300 No 325commodom RC Tecaco-class Old-Timer Oslan updates Shereshaws classic 3-nh 28-power 2 sh$1000 No 326Taylor cub RC Don Srulrs Schoolyard-Scale 048s 2-3 ch Spans 50 iv $350 No 328Bristol ScoutDRC lltzschs Precision Scale -sizespan 73 bipefor81 power4 sheets$1650 No 330Stitchin RC Randolphs advanced trainer 4-nh 1 0-1 5-power Variable stability features$375 No 332Zephyr RC Small 2-nh glider hand-launch tow thermal slope soaring$200 No334T-3 Mostly-foam-board 3-nh trainer 18-40 power Rugged Three sheets$850 No 335Sopwith Dolphin FF Bill Noonans Jumbo-Rubber scale great WW I-vintage biplane $175 No 337Super Akro-1 chips RC Scale-like stunter 5-ch 1 smoke valve 40-power 2 sheets $700 No 338Rearwin Jr RC Don Mathews Sport Scale 4-nh 40-power Monoplane$525 No 340Mossie Stunter CL Twin 35-powered semi-scale based famous WW II Mosquito bomber $400 No 341Brown B-2RC Scale-like sport flier 4-nh l9-28-pomer Rune Quickee hot 25 $500 No 342crosswind RC Bill Evans semi-sailplane 3-nh. 19-power $350 No 343Weep VI FF Mike Stoys Nuts-winning Outdoor HLO $1 00 No 344Misty CL Scale Racer Class II Also fly Mouse just sport $100 No 345La JolitaCL Scale Racer Class II also sport Mouse $100 No 346Rivets CL Scale Racer Class II also sport Mouse $100 No 347Space Shuttle RC Sport-Scale glider 2-nh. launch mother plane $1 75 No 348Onestep RC Trainer has very forgiving flying qualities 3-nh 1 0-25 power$425 No 349Davis D-1K FF Scale flying outdoors CO-2 power Spans 21 $175 No 350Electric Spitfire BC Fun-Scale 15/25 electric 20/30 glow 3-nh. spans 6 ft $750 No 351Dakota Grende RC Easy-flying bipe 60-power 4-nh. scaled-up 1850 FF$625 No 352Waltting Matilda FF Wakefield Rubber placed 2nd 1875 FF Champs $175 No 353Sanitation CL Sleek 46-powered super-Stunter contest-proven $400 No 354Merlyn BC Giact 155-in span Sailplane uses 3 BC channels $750 No 355 Santos-Dumont 14-bis BC Sport-Scale canard bipe for1 5-power 3-nh spans 56 iv 2 sheets. $575 No 356Meule Lunar Rocket BC -Scale spans 825 5-nh flaps 12 ca engine$1200 No 357SB-B CL Sport-Scale power Biplane WW I-type$200 No 358Pieces FF Indoor Easy B Rubber-power contest-winner W Van Gorder$100 No 359Black Widow RC Fun-Scale twin two lOs 4-nh BC spans 55 WW IInight fighter$675 No 360Dragon CL Slow Combat winner has foam wing uses 36-power$500 No 361Electric country Boy FF Record-holding duration craft 02 motor$200 No 362Supercat BC Half-A Pylon Racer/sport flier Aileron elevator control Foam wing$200 No 363Tiger Rag CL Sport Stunter biplane 36-power$400 No 364Neutron Star BC Sleek 40-size Pattern flierwith tail draggerretracts enclosed pipe built-up$525 No 365Seamaster RC Willards 40-size flying boat for4-ch Strap-an gearmakes landplanel 2 sheets$1100 No 366Truant FF Pert all-balsa beginners sport model 020-power$225 No 367P-39 Airacobra CL Sport-Scale uses water-cooled 45 engine mounted aft euteesios shaft $1275 No 368Space Shutffe II BC Larger improved version Hay glider 3-nh$550 eeeOe@ggOege@@eeo.e@@@OOO@eOS Circle numberss plans wish order 131168 225 239 S 0 0 0 0 0 285291299302 322323325326 340341342343 351352353354 362 363 364 365 0 Please print carefully 253259260262269278282 307309310314317318321 328330332334335337338 344345346347348349350 355356357358359360361 366367368369370371 Enclosed $_______________ S NAMF 0 STREET 0 CITY 0 0 0 0 0 0 0 0 0 S S 0 0 0 0 0 STATE ________________________________ ZIP____________ Price includes first-class postage Send check money order payable Model Aviatiort AMA 815 Fifteenth St N W washington Dc 200050 0000000 060000000000 000000000600 Fun models Any electric motor can used fly model combination prop cells motor right model things want Thats can see kinds fun models kinds com binations year September biggest gathering Electroflight models will take place Amay Belgium European Championships FAI class F3E 1984 first F3E World Championships planned suggest youd better prepared Hank Clark Continued page 76 DeGrosa Don Srull etc craft out beauty after another feel privileged greeted guys like hear Gosh man drawings Bill Winter picked work MA Ive awe sinceespecially AMA HQ MA editorial offices located get monthly pages such spartan facilities own models manybut Scale display mostly plastics dont build RC model Dont ask Id passionately love start layout -scale Curtiss Falcon 0-1 first military plane ever photographed Mitchell Field 1932 Like life love But--hear 67 have projects lined up till theyre way above head Since V-J day after Grumman went free-lance designed 12 hand-built eight boats rebuilt two houses scratch-built lake house recovered Cub Enough work three men now 1982 wouldnt believe dont Before go North now have paint Jersey home finish roof shingles pour some cement slabs replace some plumbing syndicated workshop art New York News MA cutaways other art paintings lots 35mm darkroom work family visit seven grandchildren write-up MA asked say few words fly Super Cub stay current skate new rollers get tools ready take lake weekend just spread three truckloads fill raised lawn summer whole routine Ijust rattled off begins over again lake addition get house working order repair plumbing hurt winter get three boats out under repair dock some winterdamage help son fix license famous Art Cub start building surf sailer windsurfer paint canoe built last year repair add cement block foundation finished last year add back sun porch paint house family visits help water ski skin dive sail sunfish row shell work Cub hope flying see now lake house also needs new roof shingling after 20 years theres. - oh what saying about building Radio Control model Editors note article would have longer author Hank Clark found wife typewriter staring vacantly out window has revived yet wife sent unfinished manuscript 140 Model Aviation S Full-size Plan List Available complete listing plans previously published magazine through No 364 may obtained free charge writing enclose stain ped pre-addressed businesssize envelope Model Aviation 815 Fif teenth St NW Washington DC 20005

YESTERDAY friend told following story Model aircraft electric motors will go up very slowlyat edge perform ance After batteries dead model will some 350 ft will come down after couple circles above field opinion about electric flight quite some years very little change thought matter batteries visited international contests Belgium competely different picture presented Motorgliders went up within minute 900 ft multi-channel models flew same pattern 60 combustionengine models did few years ago Noiseless Pylon models flew standard AMA Formula course 100 mph 120 sec less Stand-off Scale models did thing front very serious judges couldnt speak anymore What happened Better batteries No sir flew standard 1200 mAb Ni-Cdsthe same types used us home giving such poor result motors Sure nearly participants used Keller Geist motors what could giving couple hundred percent efficiency batteries bad Some basic information normal-type sintered Ni-Cd cell used Electroflight capacity 12 ampere-hours weighs some 16 oz has potential 12 volts calcu late energy such cell come result such cell could reach altitude 33000 feet t its own energy such energy chemical should transformed another kind energy Trans forming energy always gives some losses losses eventually will bring actual altitude could reached cell much realistic value Lets have closer look electrical energy has transformed Therefore need electric motor energy has changed via propeller velocity need something carry motor battery preferably something low air resistance 72 Model Aviation international Electroflight contests Europe saw quite variety models powered Sailpianes Pattern jobs good-sized Scale models model airplane fuselage would just fine guide experimental aircraft could use pair wings stab also model airplane wings also give us opportunity glide long time hope after air craft has lifted its maximum altitude attributes have certain weight have add weight battery thats reach much lower altitude practical example glider has weight 6 lb much weight battery 14 times 16 oz equals 224 oz So now theoretcial maximum ceiling will 9000 ft very good indeed did speak about efficiency system yet general will get 30% rest energy will transformed air resistance model beat motor battery just have stay 9000 x 3 2700 ft Yes friend what reach Electroflight Gliders days energy June 198273 EICUUU uigani U5U5 six meoucni OQU molors ruouc eeau, engine on-off controls urpiarie rues nUIEC fl LJ ntijtr elevator ailerons mojor control Seen European meet ounhr-scale oronco uses iwo 1-aulnaoer moTors crevajor anu ailerons fighter Weighs 16 lb really II spans 100 flies 42 cells p0..ing two Keller 50/48 motors has retracts Piper Cherokee weighs 77 lb spans 63 Engine Keller 50/24 battery 20 cells Turns 1 25-5 prop Scale model Electroflight spans 12ff weighs 106 lb Keller 50/30 motor 28-cell battery models capaie ot tiying tne tun battery packs 20 24 cells Props 106 Inree use Keller 50/24 motors like country will consumed about 25 minutes gives us climbing speed some 17 ft/sec net energy 150 watts 500 watts available electrical current voltages about 30 amperes information possible compute what will bring us 1% less efficiency system 9000 x 01 t climbing height less also true weight change 3 oz will give difference altitude 100 ft less give idea relationship between energy battery weight climbing height importance low total weight high efficiency system again need build aerodynamically-clean models fancy stuffjust functionality first models maybe too heavy missed knowledge understanding concerning relationships trade-offs tween differnt forms energy course another reason todays good flight results due samarium-cobalt motors which1 give same weight nearly double power output efficiency least 10% higher electric motors classic magnet materials certainly im portant contests weekend fliers however would say very acceptable performances reasonable climb ceilings about 1500 feet available standard motors Did get clue very easy waste energy electric-powered model aircraft just using prop quantity cells fuselage Present Status Electric-Powered RC Models Europe European Electroflight fliers lucky ones have local Electroflight contests country also have much-attended international events organized different countries Switzer land year 9th time Belgium 7th time West Germany 5th time Its obvious such occasions could collect useful information about did planning discuss electric-powered airplane always have include what prop cells quantity capacity motor uses will talk about various subjects order Propellers electric flight matter very different what have known until now ones frequently used Top Flite Taipan Graupner have good efficiencygood direct-driven props wants go reduction gear Electroflight Glider because prop larger diameter has lower speed higher efficiency come other types propsthe folding ones widely used Geist 190/400 has very large yellow epoxy blade based experience rubber-powered models can used applications weekend flying up contest work also Scale Electroflight Gliders like Fournier RF-5 have Carrera 91040 prop very popular among sport fliers because has very good efficiency used conjunction 10 cells 1200 mAb Mabuchi 550 74 Model Aviation mis isa demo model trom Keller major motor manusacturer weigns 11 lb flies Keller 100/35 motor carries 38 cells Just show big Keller iucell snip nere 5 renz fte.I connecting up battery pack real show stopper Top Flite maple prop used make homemade folding pro pellerfora motorglider 120 span Keller 50/24 motor 16 cells Helmut Schenk displays Solarglider Cells wing provide direct power motor Solar cells cost lot Europe motor having 31 reduction However widely-used prop banana blade prop Robbe No4012 prop inexpensive can also reworked very easily other dimensions gives satisfaction contest fliers including Scale However experimenting goes year will certainly see various new designs Ni-Cd batteries sintered Ni-Cd cells used electric-powered flight Europe 1200 mAh variety 99% time because research has made clear cells have best power-to-weight ratio Cells used General Electric type GCR 10 STselected Sanyo SCF SCT SCR types Panasonic P 120 SCP Therefore say cells Europe means cells capacity Linger wooden props often carved adapt folding prop hubs 1200 mAh Just four years ago quite possible win international Electroflight contest 10 cells days best results contests come using 20 24 26 cells reason easy understand since energy needed gain altitude adjustable either number cells used increas ing current Nowadays currents up 30 amperes frequently used out win contests commonly used 25 amperes As watts dimension indicate power available want watts available model get necessary multiply volts amperes dont want go higher amperesbecause sintered cells cannot stand currents anymoreyou just go up voltageie number cells way read cells could well read volts because flight voltage cell drops volt makes calculations much easier Just rememben cell volt volt cell Motors Next importance battery electric motor As said earlier samariumcobalt versions certainly have edge standard-magnet motors lower weight Except Mabuchi Sagami motors have three important electric motor manufacturers Keller Geist Robbe Thanks competition come up now new better versions high-quality motors now widely used over world latest development use sleeves slide oft motor housing change magnetic field thus characteristics motor product very high demand because can use several motor tailor motor output depending use such motor different sleeves can adjust power plane quantity cells want fly means such motor can used power 20 glow engine can also swing 10 x 6 Pattern ship fly full AMA pattern motor fits nearly need electric motors lot less sensitive bad landing dirt high temperatures glow engines can understand real value money way same motors can also equipped reduction gear multiplies uses two case mentioned technique building good electric motor calls small gap possible between armature magnets have motors gap small 1mm can easily understand no cooling air will pass through armature turning full rpm latest motors fully-closed type no cooling holes front cover models used fly electric varied other kind model airplanes accompanying pictures will show look less expensive motors using up 10 cells nearly always have balsa fuselages built-up wings exception new Carrera Lift 1001 has plastic fuselage foam/balsa-covered wing other models use epoxy fuselages very often foam/woodcovered wings mainly because weight cells puts real strain balsa landing models become available Continued page 137 June 198275 yellow Geist prop blade has avail able since 1978 mounted prop diame ter 16 inpitch 8 Three blades sport powered gliders up 120 span Top bottom Carrera 92040 Robbe 4012 Graupner 191 Homemade blade holders made ap propriate pitch modeler experiments find best blade Ruler centimeters Thomas Levin West Germany developed homemade 18-9 folding prop Motor glider flies Keller motor 24 cells Some European motors have interchangeable sleeves allow altering characteristics magnet different applications Keller 50/24 SL motor sleeve Geist 60I2l motor also uses interchange Robbe motors also use sleeves able sleeves two sleeves mounted change magnets available motor bodyeach about 2mm thick large quantities Europe Geist sells gear reduction system 40/14 motor Ball bearings precision machining keep friction down AIIISCIIUi% PRESENTS BALSA STRIPPER A95 AT YOUR DEALER PRECISION STRIP WOOD TO NS FROM BALSA SHEET ALSO FOR DRAFTING AND PHOTO MATS USES TYPE II BLADE SUPER TOOLGREAT PRICE WINDSOR PROPELLER CO 384 Tesconi Ct Santa Rosa CA 95401 LEADER IN SMALL AIRFOIL TECHNOLOGY MASTER AIRSCREW M~SIV b~LSVflK PcIASTER IMPROVED THROUGH FOUR YEARS OF PRODUCTION THE GIF SERIES IS UNEQUALED FOR PERFORMANCE & DURABILITY AVAILABLE WORLDWIDE THROUGH 131 DISTRIBUTORS WINDSOR PROPELLER CO 384 Tesconi Ct Santa Rosa CA 95401 higher wide left-hand turns Pylon models usually unstable turning left under power dont unusual characteristic has shown up ship frankly dont care very muchI just let climb wide lefthand circles enjoy results first two flights 6 x 3 Cox Tee-Dee prop mounted backwards old Free Flight trimming trick cut down thrust speed gross adjustments engine Frankly after first flights adjustment required turn prop around first launches trim everything neutral transmitter airplane model very forgiving wants fly let climb away control inputs after launching unless something really gross develops will probably take three four flights before will safe pre-set trims transmitter just set transmitter ground launch airplane using both hands has become normal ship now fact after pre launch control check antenna retracted usually go ahead throw thing go back extend antenna pick up transmitter sort looks like Ive showing off Im really airplane stable will allow sort thing firfldo PROPELLERS Made polyester boil color Go GRISH 1 propeller True helical pitch airfoil Sizes pitches styles AT YOUR DEALER 2 Blade Tractor 53each 5-45 35-4Nc 6364USc 747-678Nc 84868-8Nc 9-49-69-7 9810-4106Nc needs 11411-6118 1 12412-51264150 2 Blade Pusher 5446-36-4SOc 8-6Sc 9-610-6*1 3 Blade Tractor 5-36-364 USc 3 Blade Pusher 6-3SOc 3 Blade Metallic Aluminum Color Tractor /678 1 8688ia 96 106104*150 Pusher106*150 win-power Maximum altitude gained climb control inputs kept minimum try keep plane climbing less wind what looks like good rate speed will established experience anything else cautiondont let nose get high airspeed falls off starts hang prop Keep feeding down trim little time until under-elevates starts nose over will evident dramatic increase airspeed trim just tad up elevators watch carefuly recovers continues upward Meanwhile course keep twiddling rudder trim keep pointed upwind watch wing wobbles may indicate going area lift machine true its Free Flight nature glides slowly smoothly bounces wing shakes indicate turbulence wobbles little circles pay close attention looks like its going up make another circle see wings rock again youre thermal Tighten up glide circle trim sit hack enjoy ride plane goes downdraft will evident almost immediately get out particular area trimming nose down GRISH LARGE WOOD PROPELLERS HARDWOOD too hard minimizes chance Costly plane engine damage True pitch airfoil fully finished balanced ready coating 3/8 BOREALL SIZES IN18 $7 68 10 12 PITCH 20 8 22 10 24 13 letting haul itself friendlier skies down draft spot good indication lift nearby though dont go far slowing down feeling around area Thats about advice can give sin cerely hope enjoy Strato-Streak much have Electrics Blommaart Continued page 75 Electroflight places battery electric motor mind Often have pan hold battery fixed under fuselage can removed screw pops right off case mishap first designs ventilation holes June 1982 137 IN STOCK FOR IMMEDIATE SHIPMENT NewaaSUPERQUADRAr$9995 wth BRISIGHELLA FLYWHEEL611995 OUADRA MARINE eflgnR$12495 OUADRA REPAIR$1000 pIes parts KIORITZ engine 244 Cu fl619995 iin Manse ERCOUPEPIANS 82395 KIT $22998 Jin Masse TOMAHAWKPLANS 82395 KIT 623995 BALSA BASSWOOD siansl35% OFF Concept FLEETKIT 617995 FO Cowl 81995 OUADRA faIn tanksie 5695 32 8795 VICKERS LEWIS MACHINE GUN KITS61495 10 die COVERED WHEELS USA Pap82995 PLANSS SUPER STEARMAN GedfresS2B0O STARDUSTER TOO Briaghella62995 / scale 43 CUB INalita62998 VOLKSPLANE Chicken Charlie$2195 FLY BABY 61595 SES Reoschl62498 COCKPIT KITS Tonehesnk F4U-1 Spitfire82195 Ercoupe $1795 Stearrean 82095 Citahrie 62495 13 Cab 61950 ME-109 $2180 Fleet $1995 FIBERGLASS ARROW SHAFTS 8/15 o32 1g8/SlOOS 24-Hour Service $250 postage Send Bank Check Money Order JIM MESSERS QUALITY MODEL PRODUCTS 106 Valley View Dr Allegany NY 14706 RIGHT HAND TRACTOR G RUSH BROSINDIANA 46373 NEW SIZE IN 8 & 10 PITCH 26 $16 18 az/sq yd Shrinkable Easy apply Extremely strong Dope doesnt run through like silk 66 VOde Iyd$596 3IIdoOl5O 5ydc$2T50 0DER OBECT Add $100 Handling rfeseaial 3510 Sac Mateo Aveouc JERRY NELSON & COMPANY Reno Nevada 80500 702 3220664 ADVERTISERS INDEX ADVERTISERS INDEX ADVERTISERS INDEX ADVERTISERS INDEX AMA Membership ASAE Ace R/C Inc Acutech Systems Aerolite Products Inc. AeroScale 82 Aerotrend Products Air Design Airtronics Al Alman Americas Hobby Center BK Products Balsa USA Bantam Precision Products Richard G Barron Bavarian Precision Products Inc Behrens Plan Service Best Models Boynton & Associates Dave Brown Products Brownsell Flag & Decal Byron Originals Carolina-Taffinder Champion Hobbles charlies R/C Goodies Circus Hobbies George Clapp Consumers Hobby Corp Contempo Enterprises Coverite Jim Crocket Replicas DG Products DGM Industries DaCa Model Products Davey Systems Corp DuBro Products Dynathrust Props Eastcraft R/C Eds Model Products Electroline Models Electronic Servlcenter Addis Elmore FAI Model Supply FHS Supply & Mfg Co 134 135 41 106 116 77 98 116 lnside Front Cover 112 21 124 135 110 113 132 1O 133 127 47 1 18-123 113 70-71 43 16 133 133 124 114 98 93 95 97 - - 110 135 - 12 Flightilne Shirts Flyline Models Fourmost Products Fox Manufacturing Co Full Command Systems ba Corp America Generation Products Gibbs Hobby & Research Gorham Model Products Great Lakes Model & Mold Co Great Planes Model Mfg Co. Grish Brothers Hardware Systems Hobby Barn Hobby Capitol R/C Hobby Horn Hobby Lobby International Hobby Radio Shop Hobby Shack Hobby Swap News Homer Sales Hotel Harrington Indian City RC Club Indy R/C Sales J-5 Enterprises K&B Manufacturing Co K&S Engineering Kite Lines Magazine Kitty Hawk Models Kraft Systems Kustom Kraftsmanship LTA Systems Left Bank R/C Distributors Litco Systems Lodge Electronics Lone Star Models MACS Products Majestic Models McDaniel R/C Service Jim Messers Quality Products Micro-X Products Midwest Products Co Millcott Corp Miniature Aircraft Supply 107 125 99 45 126 23 116 136 131 16 1 130 137 113 lob-103 8 111 4-7 104 96 92 133 95 112 108-109 113 31 110 135 132 115 138 105 106 17 12 125 106 116 124 137 110 117 94 111 Model Engineering Norwalk130 Model Merchant136 Model Rectifier Corp side Back Cover Modelmania107 Jerry Nelson & Co137 Nor-Cal Avionics138 Peck-Polymers126 Pica Products107 Plaza Hobbycraft104 PrinceGeorges RC Club116 Proctor Enterprises110 Prop Shop114 RAC Products135 RAM Inc105 R/C Kits136 RJL Industries133 RLF Products126 R&M Quarter Scale Specialist22 Radio Control Imports22 RadioSouth103 Repla-Tech International112 Roush Manufacturing Co94 138 Saf-Flite Models124 Sailplane Factory104 Satellite City139 Sheldons Hobby Shop47 Sig Manufacturing Co9 Bob Smith R/C Aircraft124 Sonic-Tronics127 Sterling Models99 Swanson Associates130 T&D Fiberglass Specialties110 THS Distributors94 Tatone Products12 Technopowerli114 Tower Hobbies128-129 Twinn-K Inc97 WE Technical Services125 138 Welty Industries96 Williams Brothers106 Windsor Propeller Co104 137 World EnginesBack dover CA Zaic Co107 Zenith Aviation Rooks13 131 ADVERTISERS INDEX ADVERTISERS INDEX ADVERTISERS INDEX ADVERTISERS INDEX intake exhaustfor cooling air Modern design takes advantage contest experiences became very clear air didnt really cool cells because battery started heating up after landing due fact heat comes very center cell has go outside walls takes timemuch initially thought Since 198 1 more Electroflight planes available no longer have cooling holes front fuselage pilots prefer take batteries out plane after flight assure better cooling turn gives better charge Whenever someone wants duct cooling air model should directed right brushes nowhere else Contest models average Electroflight Glider contest purposes has span 110 120 Training fun flying can done 14 cells contests use 20 cells must contest motor run should short possible20 40 sec takes altitude 700-800 ft As FAI Electro flight contest allows two motor runs energy aboard should used inat mostSO 100 sec still power left after time youd better add some cells props used often standard props like Zinger Top Flite Graupner 12 x 6 16 x 8 have made foldable Special design ones also very often seen Motor throttling should waste power therefore use volteontollers efficiency much 97% more common voltcontollers can control motor gradually 0 up full rpm have advantage whole power group suffers less motor switched off power available battery Best Ducted Fans SKYRAY F4D1 6I3~__ Plan Form SKYRAY NAVY P4D1 ale Dacted Fa R/G Fo RK-25 Fa Uct44 ocg Plac Set RCDF-t Slees WE TECHNICAL SERVICES Box 76884-A Atlanta Georgia 30328 used much better know level flight needs much less power first climb altitude motor switch possible throttle back has try fly level elevator Acrobatic models Pattern models classic Gliders carry between 20 24 cells nearly always use 10 x 6 lOx 7 propellers field has concrete runway common see take off ground Probably 98% Pattern models use Keller 50/24 24X motor powerful market today too expen sive other type used Geist 60/28 has same power output higher price tag 138 Model Aviation P0 Box 3957 Torrance CA 90510 CORRECTION Roush Mfg ad page 98 May issue ModelAviation incor rectly listed phone number Correct number Roush Mfg 216-484-6810 3-FUNCTION ACCU-TACH O LCD Tachometer widual scale capabilily lOX bOX @ Digilal Volimeler cs~ 4 wilhoul load forES/I checkingscycling TX RX battery combosACCLIrACH7// Montlor quick- rg ing operation15 5 79prepaid 95\ iVorSend check money order no Calif residenis AVIONIC3S add 6% lax P0 Box 70956 Sunnyvale CA 94086 CUSTOM TUNED ENGINES COMPETITION 4CCESSORIES Specialists custom TD 049/05 1 reed engines Throttled TD available Complete Inventory Individual stock custom parts Cox TD 020 049 081 & 09 engines Exclusive distributor Nelson 15 engine parts Hard-to-get Items such custom needle valves racing wheels quick fuel shut-a fis solid control lInes others detailed brochure send 25 cents Kustom Kraftsmanshlp Box 2699 Laguna Hills CA 92653 Ph 714 830-5162 RUBBER STRIP FAI RUBBER Made USA SIZES 1/4 3/16 1/8 3/32 1/16 1mm thick 042 BOXED 16 ounces rubber per box PRICE $1200 per box postpaid USA NEW PIRELLI SIZES 6mm 3mm 1mm thick PRICE $1800 per hankapprox 1/2 kgj TIMERS KSB Fuel DT $1150 ea plus 10% UPS Sole US Distributors & World-wide Sales Send 25 1981 catalog Sup ply {CFULL*SE*PLANS 369 Super Star$550 CL Semi-scale Stunter 35-power beauty No 370 CAP-21$1400 RC Giant Scale version French aerobatic craft Quadra-power Two plan sheets documentation sheet Spans 7 ft No 371 Strato-Streak$500 RC Old-Timer version Garamis famous 41 FF design half-A power 2-chor build FF1 No 131Gee Bee Model Y 40-powered BC stand-off scale great old-time racers $500 No168Simitar RCA spectacular flying wing 15 nose-mounted tractor $300 No 225Ole Reliable RC 70 version 38 old-timer REM controls 19-25 $425 No 239Blue Birds RC Ken Willards formation plane 4-ch 10S375 No 253Mitchell B-25 RC 4-ft AA twin Ace foam panels Well-behaved $350 No 259chembermaid FF Bill Henes superlative rubber-powered scale winner $200 No 260Waco custom cabin RC Don Srulls scaler 15-20 REM controls $400 No 262creshmasger CL Crash-proof trainer 2 sizes15-30 35-40 $125 No 291cap 20 40-powered scale RC French acrobatic plane Low wing tail dragger 2 sheets 0 No 299GeeBee Sr Sportster RC -scale Haffke 81 power Prototype span 30 ft 2 sheets $1175 No 302Mini F-16 RC Sarpolus 049 dacted fan sport flier 2-ch Balsa wings tail fuse structure $275 No 307Pegeaus RC Watsons giant super sailplane features flaps spoilers T-tail 166 wingspan $675 No 309Super Brigadier RC Don Mathews update theSOs favorite Easyflying 3-nh for1 8- 25-power $475 No 3101930 Fleet Biplane RC Sport Scale 35-40 4-nh Wingspan 56 in. 1/6 scale Two sheets $625 No 314Drake II RC Ken Willards flying boat 3-nh 15-power Fly land removable gear$375 No 317SchweizerTG3-A RC Sport Scale Sailplane Jack Hiner has 11-ft span 3-nh Two sheets$1200 No 315Dirt Stripper RC Sport flier 18-40 3-nh Rugged tail-dragger rough fields $300 No 321TC Two CL Sport Stunt twin 20s features tricycle gear profile fuselage Sarpolus $425 No 322church Midwing RC-scale Rosenstock 60-power Prototype spans 26 ft 2 sheets$1000 No 323Super Voodoo CL Fast Combat John Jo features built-up wing fast construction wins $300 No 325commodom RC Tecaco-class Old-Timer Oslan updates Shereshaws classic 3-nh 28-power 2 sh$1000 No 326Taylor cub RC Don Srulrs Schoolyard-Scale 048s 2-3 ch Spans 50 iv $350 No 328Bristol ScoutDRC lltzschs Precision Scale -sizespan 73 bipefor81 power4 sheets$1650 No 330Stitchin RC Randolphs advanced trainer 4-nh 1 0-1 5-power Variable stability features$375 No 332Zephyr RC Small 2-nh glider hand-launch tow thermal slope soaring$200 No334T-3 Mostly-foam-board 3-nh trainer 18-40 power Rugged Three sheets$850 No 335Sopwith Dolphin FF Bill Noonans Jumbo-Rubber scale great WW I-vintage biplane $175 No 337Super Akro-1 chips RC Scale-like stunter 5-ch 1 smoke valve 40-power 2 sheets $700 No 338Rearwin Jr RC Don Mathews Sport Scale 4-nh 40-power Monoplane$525 No 340Mossie Stunter CL Twin 35-powered semi-scale based famous WW II Mosquito bomber $400 No 341Brown B-2RC Scale-like sport flier 4-nh l9-28-pomer Rune Quickee hot 25 $500 No 342crosswind RC Bill Evans semi-sailplane 3-nh. 19-power $350 No 343Weep VI FF Mike Stoys Nuts-winning Outdoor HLO $1 00 No 344Misty CL Scale Racer Class II Also fly Mouse just sport $100 No 345La JolitaCL Scale Racer Class II also sport Mouse $100 No 346Rivets CL Scale Racer Class II also sport Mouse $100 No 347Space Shuttle RC Sport-Scale glider 2-nh. launch mother plane $1 75 No 348Onestep RC Trainer has very forgiving flying qualities 3-nh 1 0-25 power$425 No 349Davis D-1K FF Scale flying outdoors CO-2 power Spans 21 $175 No 350Electric Spitfire BC Fun-Scale 15/25 electric 20/30 glow 3-nh. spans 6 ft $750 No 351Dakota Grende RC Easy-flying bipe 60-power 4-nh. scaled-up 1850 FF$625 No 352Waltting Matilda FF Wakefield Rubber placed 2nd 1875 FF Champs $175 No 353Sanitation CL Sleek 46-powered super-Stunter contest-proven $400 No 354Merlyn BC Giact 155-in span Sailplane uses 3 BC channels $750 No 355 Santos-Dumont 14-bis BC Sport-Scale canard bipe for1 5-power 3-nh spans 56 iv 2 sheets. $575 No 356Meule Lunar Rocket BC -Scale spans 825 5-nh flaps 12 ca engine$1200 No 357SB-B CL Sport-Scale power Biplane WW I-type$200 No 358Pieces FF Indoor Easy B Rubber-power contest-winner W Van Gorder$100 No 359Black Widow RC Fun-Scale twin two lOs 4-nh BC spans 55 WW IInight fighter$675 No 360Dragon CL Slow Combat winner has foam wing uses 36-power$500 No 361Electric country Boy FF Record-holding duration craft 02 motor$200 No 362Supercat BC Half-A Pylon Racer/sport flier Aileron elevator control Foam wing$200 No 363Tiger Rag CL Sport Stunter biplane 36-power$400 No 364Neutron Star BC Sleek 40-size Pattern flierwith tail draggerretracts enclosed pipe built-up$525 No 365Seamaster RC Willards 40-size flying boat for4-ch Strap-an gearmakes landplanel 2 sheets$1100 No 366Truant FF Pert all-balsa beginners sport model 020-power$225 No 367P-39 Airacobra CL Sport-Scale uses water-cooled 45 engine mounted aft euteesios shaft $1275 No 368Space Shutffe II BC Larger improved version Hay glider 3-nh$550 eeeOe@ggOege@@eeo.e@@@OOO@eOS Circle numberss plans wish order 131168 225 239 S 0 0 0 0 0 285291299302 322323325326 340341342343 351352353354 362 363 364 365 0 Please print carefully 253259260262269278282 307309310314317318321 328330332334335337338 344345346347348349350 355356357358359360361 366367368369370371 Enclosed $_______________ S NAMF 0 STREET 0 CITY 0 0 0 0 0 0 0 0 0 S S 0 0 0 0 0 STATE ________________________________ ZIP____________ Price includes first-class postage Send check money order payable Model Aviatiort AMA 815 Fifteenth St N W washington Dc 200050 0000000 060000000000 000000000600 Fun models Any electric motor can used fly model combination prop cells motor right model things want Thats can see kinds fun models kinds com binations year September biggest gathering Electroflight models will take place Amay Belgium European Championships FAI class F3E 1984 first F3E World Championships planned suggest youd better prepared Hank Clark Continued page 76 DeGrosa Don Srull etc craft out beauty after another feel privileged greeted guys like hear Gosh man drawings Bill Winter picked work MA Ive awe sinceespecially AMA HQ MA editorial offices located get monthly pages such spartan facilities own models manybut Scale display mostly plastics dont build RC model Dont ask Id passionately love start layout -scale Curtiss Falcon 0-1 first military plane ever photographed Mitchell Field 1932 Like life love But--hear 67 have projects lined up till theyre way above head Since V-J day after Grumman went free-lance designed 12 hand-built eight boats rebuilt two houses scratch-built lake house recovered Cub Enough work three men now 1982 wouldnt believe dont Before go North now have paint Jersey home finish roof shingles pour some cement slabs replace some plumbing syndicated workshop art New York News MA cutaways other art paintings lots 35mm darkroom work family visit seven grandchildren write-up MA asked say few words fly Super Cub stay current skate new rollers get tools ready take lake weekend just spread three truckloads fill raised lawn summer whole routine Ijust rattled off begins over again lake addition get house working order repair plumbing hurt winter get three boats out under repair dock some winterdamage help son fix license famous Art Cub start building surf sailer windsurfer paint canoe built last year repair add cement block foundation finished last year add back sun porch paint house family visits help water ski skin dive sail sunfish row shell work Cub hope flying see now lake house also needs new roof shingling after 20 years theres. - oh what saying about building Radio Control model Editors note article would have longer author Hank Clark found wife typewriter staring vacantly out window has revived yet wife sent unfinished manuscript 140 Model Aviation S Full-size Plan List Available complete listing plans previously published magazine through No 364 may obtained free charge writing enclose stain ped pre-addressed businesssize envelope Model Aviation 815 Fif teenth St NW Washington DC 20005