Bill Winter _____T12ILX E1Z0 0 Plane Talk Left Leading off Al Backstroms tailless fantasies Hoffman Wing follow-up Arup remember Smilin Jack comic strip Hoffman chief engineer Very stable model manyflights rubber now perks CO-2 Configuration less sensitive CG shifts conventional planes Tips ailerons Winter drawing large possible RC Right all-sheet Waterman Aerobile taughtAl iittl@ because always flew well Did 4Osec indoors its third flight now worn out flying ceiling hits Al has bigger built-up glow version Winterthinks RCM published RC Full-size plane Guggenheim Safety Plane competition 30s Above Lipplach Delta precursor postwar delta fighters High aspect ratio makes model extremely hard adjust Large props OK pusher tractor version Delta II would tolerate power burstof a4-in prop Both flew notwell Buildercon alders flops Right Backatroms model own successful full-scale plank Best flier series does 60 sec Cat site Left tractor stick isa tailless version Dr Lippiachs semi-ground-effect machine has flown several times never ROW Intended Right Backatroms neat Peanut Nicuport 11 Nowlen Aero kit experimental jobs displays nifty work manship nonetheless Nieuport consistently turns pretty flights though long duration Backatrom would like 30 Model Aviation L1JiJ~ FIG NOTE Long short wing versions FIG C 11 III / I/ Final version Backstroms pusher-engined plank has 110 flIght hours Insert side view tip fin isa drag rudderwhich hinges outward Dick Johnsons engine concept 16- 20-hp twin belt-driven countershaft top-mounted prop larger side view shows reflex alrfoli pusher props thrust line I Future possIbilities could include twin having delta-shaped center section area profile sketch shows airfoils thrust lines As planned two Johnsons twin-cylinder engines would used turning singie-biaded Evereil propellers TWILIGHT ZONE Lincoln Beachey glamour pilot early century said Give barn door Twill fly Al Backstrom would horrified being compared immortal Beachey indeed quite mortalgoing out boots thrilling multitudes San Francisco Golden Gate Exposition 1915 Al designs flies full-scale planks Planks go way back notably Europe Backstroms addiction finicky birds both gliders powered has found attention home-builders long involvement fringe-stuff models similarly reflects lifetime fascination gliders tailless aircraft Whats plank As see drawings plank usually paralleledged wing tailless generally assumed have no sweep heavily reflexed airfoil makes stable Well concentrate full-scale work Backstrom friends Backstrom finds No-Cal rubber-pow ered quickies especially useful look bit rough dont fooled include Nieuport 11 Peanut show capability modeling approach no fuss no feathers modeling inspired Air Trails late 30s AT covers things like Zanonia Bowlus sailplanes fired imagination articles about Northrop wings other novelties such Waterman Arrowbile convinced him such designs would fly models During epic interruption NW II became first student proposed gliding school shootingwas overthatfallofl945but EPB-iC 1965FiG D Al Cleaves 1965 modifications Backstroms 1954 EPB-1 glider uses center fin/rudder Winter says guestimating sport model hed expect CG close 15% chord hed use 5 dihedrai three-channel version 3 ailerons used modei would probably need aft vertical area especially ailerons April 1986 31 sent Pacific 1946 drifted joining Northrops engineering school 1947 saw flights huge Northrop XB-49 jet-powered bomber flying wing 1948 Chance-Vought produced Cutlass standard Navy carrier jet fighter swept-wing tail less 1950 enrolled Aero Engineering Department Mississippi State junior senior years specialized studies tailless craft Vought worked prototype Regulus cruise-type mis sile along way acquiring share Bowlusand earning commercial glider rating last two-digit US Silver Badge Soaring Mississippi studies concluded plank config uration best try Mississippi State place days Al came under influence Gus Raspet formed lifetime associa tion avid modeler full-scale flier Dick Johnson knew Gus inquisitive genius sat him basement Long Island home cigar box small hole side Hed blow cigarette smoke box close lid gently tap far side box Lovely expanding smoke rings traveled like procession ghosts across room What doing Search blowing smoke probably Mississippi commercial aircraft makers embarrassed superb performance Wittmans Tailwind Gus obtained plane Wittman took off prop covered thing tufts show airflow towed make studies experimented blown wings kind fan wing powered separate power source believe approach power plant failed giving fatal case asym metric lift Gus fine sailplane pilot Back Vought early SOs Backstrom doodled 36-ft plank aspect ratio 9-plus profile test model flew well enough demonstrate soaring potential impressed associates said Lets build 1954 26-ft 5in EPB-1 flying 1 956the ship good enough students few solo hours fly well famous pilots like Paul MacCready Gossamer fame Dick Schreder Paul Bickle Ted Jancrarek developed aerobatic routines flew air shows plank Building powered version done Van White director Experimental Aircraft Assn Dick Johnson engine genius Plans sold least several EPB-1As showed up beginning Suffice say comprehensive article appearead Bungee Cord summer 1981 issue various powered variations theme published SportAviation February 1976 February 1980 latter included full-color center spread Having unmercifully meat-axed vast material hoped nevertheless drawings will tickle fancy inspire daring create good-flying conversa tion pieces should fun Radio Control would dare say keep under control Wing loading tease have thing about wing loadings business dividing gross weight ounces square feet area Example 72 oz divided 4 sq ft equals 18 oz per sq ft loading Since little planes flit bigger ones fly nicely assumption best wing loading across board valid increas ingly useless wide variations scale things Ive wished print pundits would plot handy way us pinpoint realistic wing loading match designs think weights Jim Walkers Sonic Control Glider held Jim appeared 1954 Air Trails Annual flight photo showed Jim biowing through big party-type horn piane guidance subject mooing cows things sharing frequency Structural shot right emphasizes loveiy iines slmpiicity Note gussets used today Giant Scaic Jim found covering loose wouldnt act like drum 32 Model Aviation ~reate own oia-timerr JCTT Mcammant Cioud Nine original CA Special Enya powered three channels 4 lb 58-in span Finish Koverall Sig dope old-style 29 square Intake cost him 810 guy didnt like Jeff does snaps fun stuff under SOft Features lifting tail big ventral fin knock-off gear downthrust rock-back dihedral centerline front dowel stringered top oh big windows Finding field boxes heavy enough get banned some hIgnwa uruunnuiun devised stand lightweight 1-in PVC pipe Disassembles quit V Ig Tint car trunks its often transported plane place van Various easy-to-carry support boxes used required round out setup Plc right shows spring clips holding sembly together Plane left plc may Big Bird featured RCM some years back sizes suspect missing link ABC stuff aerodynamicist Two readers make interesting remarks pique hackers curiosity Like great majority cant bothered would know digest available material fiddle pocket calcu lator Thats reason think ing nice would someone caine up useful curves could pinned shop wall Roy Strader teethed ROGs 1929 Now Rubber Scale Old-Timers Antiques offers .. just rambling resume some items have thinking about discussing About some differences per formance size reduced increased think forget wing craft three-dimensional item wing dimensions doubled volume increased eight-fold makes quite difference volume air wing displaces course reducing wing dimensions has same effect other direction foregoing does explain what happens wing dimensions changed dont know details changes least before changes made OK think two-dimensional good enough everyday flying threedimensional Cube square exact Does Roy mean aspect ratio changing wing dimensions goes item called span loading Au referred span loading too pounds sup ported perfoot span ounces per inch foot fyou fiddle tiny models craft some designers seem ignore both design models fullscale aircraft Piper started trend Pacer its low aspect-ratio wing suppose interests cost andweight Some EAAers go same route designs seem surprised performance increase add couple feet wings span Well course EAAers add span increase aspect ratio wing area thereby also reduce wing loading Roys point aspect ratio know dont want high-drag 5-to-i wing championship Sailplane Piper may have other thoughts well Pacer older Pipers prior chubby Vagabond followed Pacer TnPacer long-winged Piper arrived cleaned-up Super Cruiser cowled Cubs became necessary truly slow up approach holding nose highfuse lage parallel horizonto increase sink rate could overshoot pretty long runway ground effect Flaps appeared later Super Cruisers Pacer landed like real airplane say settled solidly did float like J-3s T-Crafts bumpy days highaspect jobs gave rough ride whereas low-aspect Pacer TnPacer et al smoothed things out comparison higher span loading loose similarity model ing would Monarch Kadet Strader has valid points Now meet Jeff McCammant editor Marshailtown RCers Flyer extro verted ancient born dissenter comes like Midwestern tornado RC four years has several thousand words wild fun stuff first nocent paragraph has compass spinning like Cox 010which say about 30000 rpm Wing loadings wing loadings gins scaling up down Well happened upon enlightening article Ron St Jean says incorrectly considering relationship scale up down air holds wing aloft scale-up square Two dimensional Yet atmosphere three-dimensional cube Basically St Jean says consider wing loading consider loading per cubic inch volume wing occupies send copy Judge yourself think awe-inspiring especially look charts speak truth article St Jean blank now although editor appeared August 1959 MAN Free Flighters know St Jean famous Ramrod FF also MAN Ron cool cat just lately developed Nordics latemodel FFs using simple composites frameless flying surfaces light strong Rons Wing Loading Three-Dimen sional article major feature graphs demonstrate dramatically precision three-dimensional wing loading applies sizes weights models two four charts will see some pundit did provide 1959 curve always wanted Perhaps can ask MAN make Xerox copies pages 22 23 41 44 two additional pages back book material page numbers appear McCammants copies urge MANs editor republish sig nificant report subject universal important RC ironic twist wondered about charting wing loading curve values increasing scale Continued page 34 tables two four appeared August1959 issue ModeIAiiplane News article Ron St Jean entitled Wing Load ing Three Dimensional Ramrod Free Flight model numbers indicate wing areas sizes having similar glides Fig 1 shows great variations loading according traditional two-dimensional calculations Fig 2 shows almost identical loadings figured three dimensionally Winterfeels material significant designers including RC foraccurate relationships scaling up down April 1986 33 Like CAP 21 lathe stab prove validity flying wings Bill Evans uses elevons rudder control full aerobatics pattern 72-In bird 05 61 Capacitive Discharge Ignition CH Electronics Breakerless CD Ignition System can installed engine 15 large chainsaw type new 90 15 twa four stroke engines perfect far converting CH Ignition system new kits plans airplanes just becoming available perfect size engine Four stroke engines beautiful ign Detonation death four stroke enginewhen control engine timing can stop detonation makes engine run much cooler & develops power-plus no kickback 8 very low idle CH system used engine expertsMaynard Hill George Aidridge Doran Hiatt Cliff Bennett Otto Bernhart Maynard Hill used CH system last two world records Available two four stroke engines single twin cylinder Throttle Coupled Spark Advance kits available far popular engines Custom engine set-up available Call write price quote Now fETC electronic timing control information brochure price list send $1 00 CH Electronics Inc MODEL MOTOR MUGTM high quality totally glazed ceramic engine mug must modeler Standing 51/ inches tall large 10 oz capacity its real attention getter definite collectors piece years come OnlyPlus $200 postage $695and handling per order CA residents add sales tax Box 1732 Riverton WY 82501 Phone 307-8576897 REPLACEMENT PARTS FOR Kraft Engines Thator/ McCoy TaIpan 40 RJL ENGINES Call Only Factory Source RJL INDUSTRIES Free Parts Catalog Available increased looking right-hand column Fig 2 wing loading terms oz/cu ft value increases note cube square appear fall straight line curve think will quit am still behind Said St Jean mewhat surprised find recent years As could did glide well C jobs come wondered What happened Reynolds Number repealed small engines become much hotter size larger engines did fact old wing loading rule abolished have something check out latter possibility Ron continued computed wing loadings Ramrod fleet coming up information Fig 1 As can seen tables very definite progression evident small models having much lower wing loading large ones yet glides sinking speeds dif ferent-sized Ramrods pretty much same felt found answer certainly didnt understand until day hit us like bolt years have thinking wing loading terms much per square something other wing two-dimensional thing threedimensional loading should figured volume area basis has chord span thickness well test hypothesis quickly checked out calculating wing loading much per cubic inch rather square inch make measure wing volume first determined actual rib area typical Ramrod wing section divided chord area value order arrive measure average thickness Multiplying average thickness particular wing its area would produce volume cubic inches As shown table dividing weight ounces figure gives us threedimensional cubic wing loading ounces per cubic inch various-sized Ramrods Fig 2 As can seen table cubic wing loading almost identical through various sizes since models have addition equivalent gliding ability statement principle seems order scaling design different size retain same glide wing volume should made directly proportional weight Au Italics since dealing same design can make weight propor tional cube span 3/2 power area square root area cubed results same important thing being put measure wing three-dimensional terms now apparent us figuring wing loading ounces per square foot square inch useful measure Continued page 36 34 Model Aviation r RIL Industries ox 5654 dena CA 91107 Phone 818 359-0016 iLJL1 L LLL 13311 Beach Ave na Del Rey CA 1J 1-624 0@00000so@oso@o@o@o@o@o@O L VIDEO 0 HOBBY RETAILERSS Answer YesI 0 4 ESPONSE YOUR OVERWELMING0 DEMANDS WE NOW HAVE SOLID DEALERQ PLAN EXCLUSIVELY FOR YOUI YOU CAN NOW RENT OR 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Saves Models BATT-CHEK RX-1 $1495 n USA NEW Install RC Models Check receiver battery status press button Small Light 1/2 oz Precise Rugged ORDER TODAY dealer Protune Corp 1914 462-6452 PO Box 1808 Poughkeepsie NY 12601 TARBaby Especially Turn-around 850 sq 120 4 cycle powered Ron Chidgey design smooth solid performer Rib templates computer plotted Plans construc tion hints- $1195 TRANSMITTER CASE An inespensive rugged molded case protect expensive transmitter both two stick single stick transmitters Brown leather grain aluminum trim locking clasp $1895 WING TUBE & SOCKETSNEW WING MOUNTING SET Aluminum alloy tubing plug-inA wing mounting system developed Ron Chidgey wings Included pair ofthat fast neat accurate stays tight Three special slip fit phenolic socketsnylon brackets screws machined wing blocks build wing structureincluded -$695 Now size models 718 dia s 2 $ 8g5 1 dies 2$ gg 1 dia x3 -$1495 P Gator RIO Products 3713 Pompano Dr See Dealer Order Direct Pensacola FL 32514for UPS Phone AC 904 476-8639Include $150 Per Item TORK-STARTER revolutionary concept power iSV glow plugs model cars boats air plenes using glow fuel engines TORK-STARTERITMI has steel wrench strong W enough reduce compression easier starting supplies power doing comes new CuD charger has LED indicate nhe unit charging also has removable T handle can used Torque amplIfier Over 50 consecutive starts full charge rechargeable hundreds times Clips onto plug positive connection Send ad along prepayment receive MFG OF NI-STARTER free shipping handling TORK-STARTER T$2995 Charger NOV 22tV 12V Fast Chartvrl $2995 $2095 Without Charger Charger CHARGERS PLEASE SPECIFY WHICH CHARGER 95 Charger Only WHEN ORDERINGII tOy 220V 12V Fast Chargtrl 12421 Ransom Dr. Glenn Dale MD 20769301 464-2260 comparison between models almost same sizes con sidered real fallacy making wing loading comparisons area basis co-mingling oranges apples speak weight three-dimensional area two-dimensional direct comparison need express terms other will same dimension whether two three Poor Jeff McCanimant writes wonderful letter talk about St Jean Third Dimension Saying modeler since day born beats proud designing own stuff ant-eating own parts building flying alone really blooming extrovert Heres what said about training Being. way am rejected normal way learning fly RC popular way accepted around 40-powered four-channel trainer first differently wanted Sailplane Jeff declares So got Sig Riser Rider put power pod Thats revolutionary No other way fly start engine radio toss climb play land feet again Theres no running get 900-ft highstart line no tow hooks etc taught myself fly Never instructor Now three years later club has people fly Gliders power pods started almost nobody thought flying Gliders Glider gives plenty reaction time Jeff makes sense too am block headed Listen up quiet airstrip Doug Pratt flying simultane ously now Kracketjac new Rookie pennants drooped tennas soft Bahamian air two Enya four-strokes purred quietly impacting dream-world environment yellow low-winger red cabin ship against deep blue sky eight minutes both planes trimmed hands off switched transmitters What rare experience fly two own planes flight different As sun sank beginner never taken off landed himseW appeared RCM 40 knocking knees Doug took oft flew superbly low-key support talk reassuring him fast nicely-banked approaches did flawlessly mentioned flown Gentle Lady didnt count leftright days behind him Thats giant first step Doug said after learned fly MRC Chipmunk Doug years ago snap rolling second flight too flown Gentle Lady same quirk young beginner friends didnt count What Ive talked truly hot-start beginners given truth serum confess good times Gentle Lady others like find myself perplexed strangers ask about getting started usually no help want anything better knowing resistance real primary trainers some stigma cross mental fingers suggest Gentle Lady does have say something power training such models climb slowly mope along good podmounted 049 myself Id put engine nose Its good plane beginning Electrics too Start popular 05 electric motors six 12 Ah Sanyo cells later may want try SR batteries other props cells folders cobalt motors reduction drives etc keep start simple going swallow tub-thumping jargon argot insist fast 40powered animal four channels little forgiveness thats fine sellers accessories include certified instructor great communicator under stands children work living youll have wait instructor busy Sunday good guys similarly desperate fly youll wallflower fruitless Sundays ticking away like taxi meterif active site busy club However learn solo yourself path easier have flown form model past wont let fly site until youve demonstrated proper solo flight Few instructors able willing give feel flight itself understand inner nature little beasts begin Glider select kit shows rigging power pod Thrust lines important example nose-mounted glow engine electric mo tor will require downthrust model will stall easily under power spells sloppy flight floundering con trol under power airspeed higher design speed Glider producing excess lift downthrust counteracts excess lift nose-mounted power source will need least 20 down maybe 40 50 pod engine motor high above both center gravity center drag has effect similar downthrust may enough paraphrase Will Rogers said never met man didnt like never met field box 1 did like Life simple doorbell battery Pandoras shoebox jug wine gas/oil 5% glow thou airplane 1950 guy named Broadfield discovered later have big manufacturer balsa gliders ROGs during 20s appeared Long Island field field box detachable legs man didnt come down trees got off knees standup starting two U-shaped saddle pieces inserted hold model days box standing crosswind light 6-ft cabin ship top often blew over after-shock splintering noises ol boy gifted bunch us boxes cried foul bills arrived Can imagine gall Seven bucks came starters wet cells glow Continued page 122 Youli Soar Unimagined Heights Now can build paper airplanes fly high far masters Paper Airplane Book official book Second Great International Paper Airplane Contest Youll get tips winners blueprints prize winning designs instructions build own high-flying planes Learn Secrets Japanese Air Superiority reason Japanese hold paper airplane records paper use Its never available count. until now including enough sheets exclusive paper make several models own Prepared editors Science 86 Paper Airplane Book beautifully designed high-quality photography winning entries Second Great International Paper Airplane Contest Its perfect gift paper pilots ages Special Offer Science 86 Through special arrangement Random House Science 86 now accepting orders PaperAirplane Book just $895 order copies just fill coupon below mail us check money order Please send mecopies PaperAirplane Book $895 plus $175 postage handling Mail tO Science 86 Airplane Book PO Box 10982 'DesMoines Iowa 50340 Total amount order $________ D Enclosed check money order made payable Science 86 Eli Please charge my[]Visa MasterCard rn Date Siomt,rp Address City State 7in Please allow 46 weeks delivery Outside U5Aadd $250 PAB-MA486 April 1986 37 PILOTS TS RIOR TS T THE MOST SUPERIOR PILOT FIGURE ON THE MARKET LIGHTEST WEIGHT MOST REALISTIC AVAILABLE GIVE YOUR PLANE PILOT FOR YOUR NEWEST OLDEST OR NEXT CREATION R YOURS TODAY FULL FIGURES CIVILIANWWII MILITARY 1/3 Scale $19951/5 Navy $1395 1/4 Scale14951/6AAF1195 1 /5 Scale1295 Plus 1/12 Scale895$250 shipping 1/12 Chopper 895each figure KNIGHTS OF THE AIR 1400 Rte 22 West Friendship MD 21794 301-489-5050 Letters Editor Continued page 12 compiling error having gone undetected long quantity E1115/61 usually much smaller quantity L*S2/Sl As such little error pro duced used probably noticed attributed geometric variations actual model Mr Donatelli found error may have used design di mensions producing severe imbab ance So Line 760 should read PL*S2/SlE1/15/Gl apologies error must lot modelers out computers already getting mail about article Design Analysis Program Dick Sarpolus Shrewsbury NJ Safety Preston Continued page 20 stated experiencing prob lems some parts country RC cars buggies using frequencies reserved aircraft. Perhaps Davids label suggestion can help alleviate some problems FlutterAnother item mentioned last months Safety column suggestion modeler should man datory checks models prevent con trol surface flutter November 1985 issue Corsair newsletter Joint Military R/G Fliers Club editor Marlin Kinning article flutter written noted modeler Cliff Weirick benefit readers may know what flutter can model Im reproducing Cliffs article FLUTTER Most know what seem some fliers dontor dont care break flutter down two levels full blown FLUTTER very destructive force second BUZZ Buzz too very destructive force slightly dif ferent way Lets look FLUTTER first can destroy airplane quicker can blink eye can attack sur face plane its prime targets ailerons followed closely elevator rudder flutter starts matter time until surface itself leaves plane takes sur face attached case two wings elevator counts up three airplanes stunt job wing failure next two Formula Ones Another aileron wing other elevator Actu ally very famousor should say infamouscrash lot oldtimers will remember Nats Los Alamitos NAS Boy what mess Now know what flutter can lets think about BUZZ hard describe because cant hear power model unless engine dead can hear flutter loud est engines whining away Buzz tends destroy servosand ultimately plane tends ruin gears worse yet attacks feedback pot ser vo does wearing small area usually around level-flight neutral position happens wonder sometimes controls may act funny What causes buzz Primarily two things Loose control surfaces sloppy tail-heavy loose sloppy pushrods etc see control surfaces look ready fall off airplane yet pilots ignore Same way pushrods Some builders drill %2-in holes control horn use 46-in wire Thats really asking sum up check things time go out fly remem ber tight will wear out get loose Have safe moath John Preston 12235 Tildenwood Dr Rockville MD 20852 responding advertisers mention read aboutthem ModelAviation drivers fuel pumps rolled aisles over power panels gallon fuel cans transmitter tray must got hand-held units Field boxes heavy wacky high-techand prop can cost seven bucks about power panel under nose run engines fancy hinged lids prevent getting anything plane figure top wedding cake ends up ground crawling aroundeasier get ting up down like jive puppet Im back knees now cant get up Legs no legs question Bill H Greenhalgh man after own heart dont have ambition brains too suffering herd guy lives place called Wetumpka Alabama must have right stuff am another old coot Au Good name next modeL built first model airplane back 1920s Bill edifies us after 30 years Air Corps/Air Force another 10 years doingthings government heart problem came back modeling After building Sig Kadet bitten RC bug since have built several airplanes mostly scratch Being too old hands knees bit fueling starting airplanes put folding legs huge field box raise level permitted work standing position course field box/stand weighed much took two us move After building some plant stands PVC plastic pipe wife realized could have light field stand could handle easily comfort several months now have using stand shown enclosed photographs Built 1-in PVC pipe consists two ends two shelves supports airplane fastened ends bolts wing nuts permitting quicikly change fit different fuselages padding fuselage supports insulation sold PVC pipes 1 22 Model Aviation Plane Talk/Winter Continued page 37 two shelves simply two straight pipes held together sheet hardboard shelves ends joined spring clips shown pictures whole thing disassembles quickly fit car trunks room spare usually leave assembled carry airplane van Once decided sizes wanted figured out parts list construction took less hour expenditure less $10 field stand doubles great work stand shop stand problem solved turned problem equipment carried old field box Using scrap plywood built three boxes fueling box carries half-gallon plastic fuel tank 12-volt battery electric fuel pump starter box includes 12-volt battery power panel storage space glow plugs small tools electric starter tool box has drawer small tools parts storage compartments spare propellers larger tools equip ment cleaning equipment other essential items seldom needed put cleats ends bottom box fit over shelves keep boxes vibrating off shelf boxes quite light easily handled two 12-volt batteries provide back up prevent loss flying session forget charge Add folding chair jug coffee iced tea depending upon tempera ture have makings com fortable enjoyable flying session know youngsters will sneer such sissy stuff thought would pass along whatever worth hope will interest some other old-timers senior citizens seem coming RC hobby simplifi cation equipment might ensure sustained interest pleasant flying field conditions Thus spake Bill Greenhalgh Wetump ka AL Favor requested Will something cause close heart February 1986 ModelAirplane News Hal deBolt began new long-needed feature Golden Age RC has making long time us have put heads together help make possible always wanted self colunm specifically RC have interest Antique OldTimer modeling SAM Society Antique Modelers makes go Thats primarily based old Free Flight models RC-assist involved interest Old-Timer Control Line models obvious potential RC its own right has neglecteduntil now know 1950s 6-ft 35powered Smog Hog example does anything can Saturday Night Specialexcept go straight up Its easier safer fly things flown now came low-wing Smog Hog Sig Mfg Co perceived Kasmirski 45-powered Orion 1960 Aero batics World Champion still matches performance modern engine anything can think hot aerobatic airplane hundreds published once-kitted wonderful air planesdeltas canards name Ob viously an Antique era OldTimer era Nostalgic erastarting things like Goods Big Guff prewar days Taurus Orion 1960 Buzzard Bombshells could promote competitions aware majority will prefer simply enjoy flying historic planes Please contribute Hals column us hundreds pictures out Send background info Harold deBolt 2206 Greenwich Dr Kings Pt Sun City Center FL 33570 Without contributions column like deBolts cannot continued indefi nitely Photographic examples particular needed Falcon OldTimer dating late SOs Beams Esquires H-Rays Berkeleys Hollinger J 3 Fairchild PT on Walt Goods series history Radio Control began last month Chet Lanzo has asked help major presentation 1934 RC-1 prehistoric radio gear People keep building Krackerjac Rookie designers have same experience Beyond historic stuff now appearing magazine no continuity except deBolts Golden Age thing requires everyone interested assure prospers pictures good information Mining gold depends have gratitude joining effort Before long youll have yourself thank having bothered Bill Winter 4432 Altura Ct Fajifax VA 22030 Radio Technique/Myers Continued page 38 buy products object will likely accompanied warning literature manufacturer will receptive constructive criticism object being sold lacks such obvious liability/litigation potential manufacturers interest usually concen trates itself price profit performed static structural load test airplanes towhook/fuselage/wing combination Jugs water provided test load pint water weighs pound Note done before wing covered wing should depend covering strength sides something cracks want see well hear wing spar strong enough Only dowel needed changed Continued page 126 April 1986 123 C C El I m z 0 z z C 0 0 m I m 0 q 0 CD C 0 0 C -4 0 CD 0 Co U 0 -L N 0 0 01 x x N
Edition: Model Aviation - 1986/04
Page Numbers: 30, 31, 32, 33, 34, 36, 37, 122, 123
Bill Winter _____T12ILX E1Z0 0 Plane Talk Left Leading off Al Backstroms tailless fantasies Hoffman Wing follow-up Arup remember Smilin Jack comic strip Hoffman chief engineer Very stable model manyflights rubber now perks CO-2 Configuration less sensitive CG shifts conventional planes Tips ailerons Winter drawing large possible RC Right all-sheet Waterman Aerobile taughtAl iittl@ because always flew well Did 4Osec indoors its third flight now worn out flying ceiling hits Al has bigger built-up glow version Winterthinks RCM published RC Full-size plane Guggenheim Safety Plane competition 30s Above Lipplach Delta precursor postwar delta fighters High aspect ratio makes model extremely hard adjust Large props OK pusher tractor version Delta II would tolerate power burstof a4-in prop Both flew notwell Buildercon alders flops Right Backatroms model own successful full-scale plank Best flier series does 60 sec Cat site Left tractor stick isa tailless version Dr Lippiachs semi-ground-effect machine has flown several times never ROW Intended Right Backatroms neat Peanut Nicuport 11 Nowlen Aero kit experimental jobs displays nifty work manship nonetheless Nieuport consistently turns pretty flights though long duration Backatrom would like 30 Model Aviation L1JiJ~ FIG NOTE Long short wing versions FIG C 11 III / I/ Final version Backstroms pusher-engined plank has 110 flIght hours Insert side view tip fin isa drag rudderwhich hinges outward Dick Johnsons engine concept 16- 20-hp twin belt-driven countershaft top-mounted prop larger side view shows reflex alrfoli pusher props thrust line I Future possIbilities could include twin having delta-shaped center section area profile sketch shows airfoils thrust lines As planned two Johnsons twin-cylinder engines would used turning singie-biaded Evereil propellers TWILIGHT ZONE Lincoln Beachey glamour pilot early century said Give barn door Twill fly Al Backstrom would horrified being compared immortal Beachey indeed quite mortalgoing out boots thrilling multitudes San Francisco Golden Gate Exposition 1915 Al designs flies full-scale planks Planks go way back notably Europe Backstroms addiction finicky birds both gliders powered has found attention home-builders long involvement fringe-stuff models similarly reflects lifetime fascination gliders tailless aircraft Whats plank As see drawings plank usually paralleledged wing tailless generally assumed have no sweep heavily reflexed airfoil makes stable Well concentrate full-scale work Backstrom friends Backstrom finds No-Cal rubber-pow ered quickies especially useful look bit rough dont fooled include Nieuport 11 Peanut show capability modeling approach no fuss no feathers modeling inspired Air Trails late 30s AT covers things like Zanonia Bowlus sailplanes fired imagination articles about Northrop wings other novelties such Waterman Arrowbile convinced him such designs would fly models During epic interruption NW II became first student proposed gliding school shootingwas overthatfallofl945but EPB-iC 1965FiG D Al Cleaves 1965 modifications Backstroms 1954 EPB-1 glider uses center fin/rudder Winter says guestimating sport model hed expect CG close 15% chord hed use 5 dihedrai three-channel version 3 ailerons used modei would probably need aft vertical area especially ailerons April 1986 31 sent Pacific 1946 drifted joining Northrops engineering school 1947 saw flights huge Northrop XB-49 jet-powered bomber flying wing 1948 Chance-Vought produced Cutlass standard Navy carrier jet fighter swept-wing tail less 1950 enrolled Aero Engineering Department Mississippi State junior senior years specialized studies tailless craft Vought worked prototype Regulus cruise-type mis sile along way acquiring share Bowlusand earning commercial glider rating last two-digit US Silver Badge Soaring Mississippi studies concluded plank config uration best try Mississippi State place days Al came under influence Gus Raspet formed lifetime associa tion avid modeler full-scale flier Dick Johnson knew Gus inquisitive genius sat him basement Long Island home cigar box small hole side Hed blow cigarette smoke box close lid gently tap far side box Lovely expanding smoke rings traveled like procession ghosts across room What doing Search blowing smoke probably Mississippi commercial aircraft makers embarrassed superb performance Wittmans Tailwind Gus obtained plane Wittman took off prop covered thing tufts show airflow towed make studies experimented blown wings kind fan wing powered separate power source believe approach power plant failed giving fatal case asym metric lift Gus fine sailplane pilot Back Vought early SOs Backstrom doodled 36-ft plank aspect ratio 9-plus profile test model flew well enough demonstrate soaring potential impressed associates said Lets build 1954 26-ft 5in EPB-1 flying 1 956the ship good enough students few solo hours fly well famous pilots like Paul MacCready Gossamer fame Dick Schreder Paul Bickle Ted Jancrarek developed aerobatic routines flew air shows plank Building powered version done Van White director Experimental Aircraft Assn Dick Johnson engine genius Plans sold least several EPB-1As showed up beginning Suffice say comprehensive article appearead Bungee Cord summer 1981 issue various powered variations theme published SportAviation February 1976 February 1980 latter included full-color center spread Having unmercifully meat-axed vast material hoped nevertheless drawings will tickle fancy inspire daring create good-flying conversa tion pieces should fun Radio Control would dare say keep under control Wing loading tease have thing about wing loadings business dividing gross weight ounces square feet area Example 72 oz divided 4 sq ft equals 18 oz per sq ft loading Since little planes flit bigger ones fly nicely assumption best wing loading across board valid increas ingly useless wide variations scale things Ive wished print pundits would plot handy way us pinpoint realistic wing loading match designs think weights Jim Walkers Sonic Control Glider held Jim appeared 1954 Air Trails Annual flight photo showed Jim biowing through big party-type horn piane guidance subject mooing cows things sharing frequency Structural shot right emphasizes loveiy iines slmpiicity Note gussets used today Giant Scaic Jim found covering loose wouldnt act like drum 32 Model Aviation ~reate own oia-timerr JCTT Mcammant Cioud Nine original CA Special Enya powered three channels 4 lb 58-in span Finish Koverall Sig dope old-style 29 square Intake cost him 810 guy didnt like Jeff does snaps fun stuff under SOft Features lifting tail big ventral fin knock-off gear downthrust rock-back dihedral centerline front dowel stringered top oh big windows Finding field boxes heavy enough get banned some hIgnwa uruunnuiun devised stand lightweight 1-in PVC pipe Disassembles quit V Ig Tint car trunks its often transported plane place van Various easy-to-carry support boxes used required round out setup Plc right shows spring clips holding sembly together Plane left plc may Big Bird featured RCM some years back sizes suspect missing link ABC stuff aerodynamicist Two readers make interesting remarks pique hackers curiosity Like great majority cant bothered would know digest available material fiddle pocket calcu lator Thats reason think ing nice would someone caine up useful curves could pinned shop wall Roy Strader teethed ROGs 1929 Now Rubber Scale Old-Timers Antiques offers .. just rambling resume some items have thinking about discussing About some differences per formance size reduced increased think forget wing craft three-dimensional item wing dimensions doubled volume increased eight-fold makes quite difference volume air wing displaces course reducing wing dimensions has same effect other direction foregoing does explain what happens wing dimensions changed dont know details changes least before changes made OK think two-dimensional good enough everyday flying threedimensional Cube square exact Does Roy mean aspect ratio changing wing dimensions goes item called span loading Au referred span loading too pounds sup ported perfoot span ounces per inch foot fyou fiddle tiny models craft some designers seem ignore both design models fullscale aircraft Piper started trend Pacer its low aspect-ratio wing suppose interests cost andweight Some EAAers go same route designs seem surprised performance increase add couple feet wings span Well course EAAers add span increase aspect ratio wing area thereby also reduce wing loading Roys point aspect ratio know dont want high-drag 5-to-i wing championship Sailplane Piper may have other thoughts well Pacer older Pipers prior chubby Vagabond followed Pacer TnPacer long-winged Piper arrived cleaned-up Super Cruiser cowled Cubs became necessary truly slow up approach holding nose highfuse lage parallel horizonto increase sink rate could overshoot pretty long runway ground effect Flaps appeared later Super Cruisers Pacer landed like real airplane say settled solidly did float like J-3s T-Crafts bumpy days highaspect jobs gave rough ride whereas low-aspect Pacer TnPacer et al smoothed things out comparison higher span loading loose similarity model ing would Monarch Kadet Strader has valid points Now meet Jeff McCammant editor Marshailtown RCers Flyer extro verted ancient born dissenter comes like Midwestern tornado RC four years has several thousand words wild fun stuff first nocent paragraph has compass spinning like Cox 010which say about 30000 rpm Wing loadings wing loadings gins scaling up down Well happened upon enlightening article Ron St Jean says incorrectly considering relationship scale up down air holds wing aloft scale-up square Two dimensional Yet atmosphere three-dimensional cube Basically St Jean says consider wing loading consider loading per cubic inch volume wing occupies send copy Judge yourself think awe-inspiring especially look charts speak truth article St Jean blank now although editor appeared August 1959 MAN Free Flighters know St Jean famous Ramrod FF also MAN Ron cool cat just lately developed Nordics latemodel FFs using simple composites frameless flying surfaces light strong Rons Wing Loading Three-Dimen sional article major feature graphs demonstrate dramatically precision three-dimensional wing loading applies sizes weights models two four charts will see some pundit did provide 1959 curve always wanted Perhaps can ask MAN make Xerox copies pages 22 23 41 44 two additional pages back book material page numbers appear McCammants copies urge MANs editor republish sig nificant report subject universal important RC ironic twist wondered about charting wing loading curve values increasing scale Continued page 34 tables two four appeared August1959 issue ModeIAiiplane News article Ron St Jean entitled Wing Load ing Three Dimensional Ramrod Free Flight model numbers indicate wing areas sizes having similar glides Fig 1 shows great variations loading according traditional two-dimensional calculations Fig 2 shows almost identical loadings figured three dimensionally Winterfeels material significant designers including RC foraccurate relationships scaling up down April 1986 33 Like CAP 21 lathe stab prove validity flying wings Bill Evans uses elevons rudder control full aerobatics pattern 72-In bird 05 61 Capacitive Discharge Ignition CH Electronics Breakerless CD Ignition System can installed engine 15 large chainsaw type new 90 15 twa four stroke engines perfect far converting CH Ignition system new kits plans airplanes just becoming available perfect size engine Four stroke engines beautiful ign Detonation death four stroke enginewhen control engine timing can stop detonation makes engine run much cooler & develops power-plus no kickback 8 very low idle CH system used engine expertsMaynard Hill George Aidridge Doran Hiatt Cliff Bennett Otto Bernhart Maynard Hill used CH system last two world records Available two four stroke engines single twin cylinder Throttle Coupled Spark Advance kits available far popular engines Custom engine set-up available Call write price quote Now fETC electronic timing control information brochure price list send $1 00 CH Electronics Inc MODEL MOTOR MUGTM high quality totally glazed ceramic engine mug must modeler Standing 51/ inches tall large 10 oz capacity its real attention getter definite collectors piece years come OnlyPlus $200 postage $695and handling per order CA residents add sales tax Box 1732 Riverton WY 82501 Phone 307-8576897 REPLACEMENT PARTS FOR Kraft Engines Thator/ McCoy TaIpan 40 RJL ENGINES Call Only Factory Source RJL INDUSTRIES Free Parts Catalog Available increased looking right-hand column Fig 2 wing loading terms oz/cu ft value increases note cube square appear fall straight line curve think will quit am still behind Said St Jean mewhat surprised find recent years As could did glide well C jobs come wondered What happened Reynolds Number repealed small engines become much hotter size larger engines did fact old wing loading rule abolished have something check out latter possibility Ron continued computed wing loadings Ramrod fleet coming up information Fig 1 As can seen tables very definite progression evident small models having much lower wing loading large ones yet glides sinking speeds dif ferent-sized Ramrods pretty much same felt found answer certainly didnt understand until day hit us like bolt years have thinking wing loading terms much per square something other wing two-dimensional thing threedimensional loading should figured volume area basis has chord span thickness well test hypothesis quickly checked out calculating wing loading much per cubic inch rather square inch make measure wing volume first determined actual rib area typical Ramrod wing section divided chord area value order arrive measure average thickness Multiplying average thickness particular wing its area would produce volume cubic inches As shown table dividing weight ounces figure gives us threedimensional cubic wing loading ounces per cubic inch various-sized Ramrods Fig 2 As can seen table cubic wing loading almost identical through various sizes since models have addition equivalent gliding ability statement principle seems order scaling design different size retain same glide wing volume should made directly proportional weight Au Italics since dealing same design can make weight propor tional cube span 3/2 power area square root area cubed results same important thing being put measure wing three-dimensional terms now apparent us figuring wing loading ounces per square foot square inch useful measure Continued page 36 34 Model Aviation r RIL Industries ox 5654 dena CA 91107 Phone 818 359-0016 iLJL1 L LLL 13311 Beach Ave na Del Rey CA 1J 1-624 0@00000so@oso@o@o@o@o@o@O L VIDEO 0 HOBBY RETAILERSS Answer YesI 0 4 ESPONSE YOUR OVERWELMING0 DEMANDS WE NOW HAVE SOLID DEALERQ PLAN EXCLUSIVELY FOR YOUI YOU CAN NOW RENT OR 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Saves Models BATT-CHEK RX-1 $1495 n USA NEW Install RC Models Check receiver battery status press button Small Light 1/2 oz Precise Rugged ORDER TODAY dealer Protune Corp 1914 462-6452 PO Box 1808 Poughkeepsie NY 12601 TARBaby Especially Turn-around 850 sq 120 4 cycle powered Ron Chidgey design smooth solid performer Rib templates computer plotted Plans construc tion hints- $1195 TRANSMITTER CASE An inespensive rugged molded case protect expensive transmitter both two stick single stick transmitters Brown leather grain aluminum trim locking clasp $1895 WING TUBE & SOCKETSNEW WING MOUNTING SET Aluminum alloy tubing plug-inA wing mounting system developed Ron Chidgey wings Included pair ofthat fast neat accurate stays tight Three special slip fit phenolic socketsnylon brackets screws machined wing blocks build wing structureincluded -$695 Now size models 718 dia s 2 $ 8g5 1 dies 2$ gg 1 dia x3 -$1495 P Gator RIO Products 3713 Pompano Dr See Dealer Order Direct Pensacola FL 32514for UPS Phone AC 904 476-8639Include $150 Per Item TORK-STARTER revolutionary concept power iSV glow plugs model cars boats air plenes using glow fuel engines TORK-STARTERITMI has steel wrench strong W enough reduce compression easier starting supplies power doing comes new CuD charger has LED indicate nhe unit charging also has removable T handle can used Torque amplIfier Over 50 consecutive starts full charge rechargeable hundreds times Clips onto plug positive connection Send ad along prepayment receive MFG OF NI-STARTER free shipping handling TORK-STARTER T$2995 Charger NOV 22tV 12V Fast Chartvrl $2995 $2095 Without Charger Charger CHARGERS PLEASE SPECIFY WHICH CHARGER 95 Charger Only WHEN ORDERINGII tOy 220V 12V Fast Chargtrl 12421 Ransom Dr. Glenn Dale MD 20769301 464-2260 comparison between models almost same sizes con sidered real fallacy making wing loading comparisons area basis co-mingling oranges apples speak weight three-dimensional area two-dimensional direct comparison need express terms other will same dimension whether two three Poor Jeff McCanimant writes wonderful letter talk about St Jean Third Dimension Saying modeler since day born beats proud designing own stuff ant-eating own parts building flying alone really blooming extrovert Heres what said about training Being. way am rejected normal way learning fly RC popular way accepted around 40-powered four-channel trainer first differently wanted Sailplane Jeff declares So got Sig Riser Rider put power pod Thats revolutionary No other way fly start engine radio toss climb play land feet again Theres no running get 900-ft highstart line no tow hooks etc taught myself fly Never instructor Now three years later club has people fly Gliders power pods started almost nobody thought flying Gliders Glider gives plenty reaction time Jeff makes sense too am block headed Listen up quiet airstrip Doug Pratt flying simultane ously now Kracketjac new Rookie pennants drooped tennas soft Bahamian air two Enya four-strokes purred quietly impacting dream-world environment yellow low-winger red cabin ship against deep blue sky eight minutes both planes trimmed hands off switched transmitters What rare experience fly two own planes flight different As sun sank beginner never taken off landed himseW appeared RCM 40 knocking knees Doug took oft flew superbly low-key support talk reassuring him fast nicely-banked approaches did flawlessly mentioned flown Gentle Lady didnt count leftright days behind him Thats giant first step Doug said after learned fly MRC Chipmunk Doug years ago snap rolling second flight too flown Gentle Lady same quirk young beginner friends didnt count What Ive talked truly hot-start beginners given truth serum confess good times Gentle Lady others like find myself perplexed strangers ask about getting started usually no help want anything better knowing resistance real primary trainers some stigma cross mental fingers suggest Gentle Lady does have say something power training such models climb slowly mope along good podmounted 049 myself Id put engine nose Its good plane beginning Electrics too Start popular 05 electric motors six 12 Ah Sanyo cells later may want try SR batteries other props cells folders cobalt motors reduction drives etc keep start simple going swallow tub-thumping jargon argot insist fast 40powered animal four channels little forgiveness thats fine sellers accessories include certified instructor great communicator under stands children work living youll have wait instructor busy Sunday good guys similarly desperate fly youll wallflower fruitless Sundays ticking away like taxi meterif active site busy club However learn solo yourself path easier have flown form model past wont let fly site until youve demonstrated proper solo flight Few instructors able willing give feel flight itself understand inner nature little beasts begin Glider select kit shows rigging power pod Thrust lines important example nose-mounted glow engine electric mo tor will require downthrust model will stall easily under power spells sloppy flight floundering con trol under power airspeed higher design speed Glider producing excess lift downthrust counteracts excess lift nose-mounted power source will need least 20 down maybe 40 50 pod engine motor high above both center gravity center drag has effect similar downthrust may enough paraphrase Will Rogers said never met man didnt like never met field box 1 did like Life simple doorbell battery Pandoras shoebox jug wine gas/oil 5% glow thou airplane 1950 guy named Broadfield discovered later have big manufacturer balsa gliders ROGs during 20s appeared Long Island field field box detachable legs man didnt come down trees got off knees standup starting two U-shaped saddle pieces inserted hold model days box standing crosswind light 6-ft cabin ship top often blew over after-shock splintering noises ol boy gifted bunch us boxes cried foul bills arrived Can imagine gall Seven bucks came starters wet cells glow Continued page 122 Youli Soar Unimagined Heights Now can build paper airplanes fly high far masters Paper Airplane Book official book Second Great International Paper Airplane Contest Youll get tips winners blueprints prize winning designs instructions build own high-flying planes Learn Secrets Japanese Air Superiority reason Japanese hold paper airplane records paper use Its never available count. until now including enough sheets exclusive paper make several models own Prepared editors Science 86 Paper Airplane Book beautifully designed high-quality photography winning entries Second Great International Paper Airplane Contest Its perfect gift paper pilots ages Special Offer Science 86 Through special arrangement Random House Science 86 now accepting orders PaperAirplane Book just $895 order copies just fill coupon below mail us check money order Please send mecopies PaperAirplane Book $895 plus $175 postage handling Mail tO Science 86 Airplane Book PO Box 10982 'DesMoines Iowa 50340 Total amount order $________ D Enclosed check money order made payable Science 86 Eli Please charge my[]Visa MasterCard rn Date Siomt,rp Address City State 7in Please allow 46 weeks delivery Outside U5Aadd $250 PAB-MA486 April 1986 37 PILOTS TS RIOR TS T THE MOST SUPERIOR PILOT FIGURE ON THE MARKET LIGHTEST WEIGHT MOST REALISTIC AVAILABLE GIVE YOUR PLANE PILOT FOR YOUR NEWEST OLDEST OR NEXT CREATION R YOURS TODAY FULL FIGURES CIVILIANWWII MILITARY 1/3 Scale $19951/5 Navy $1395 1/4 Scale14951/6AAF1195 1 /5 Scale1295 Plus 1/12 Scale895$250 shipping 1/12 Chopper 895each figure KNIGHTS OF THE AIR 1400 Rte 22 West Friendship MD 21794 301-489-5050 Letters Editor Continued page 12 compiling error having gone undetected long quantity E1115/61 usually much smaller quantity L*S2/Sl As such little error pro duced used probably noticed attributed geometric variations actual model Mr Donatelli found error may have used design di mensions producing severe imbab ance So Line 760 should read PL*S2/SlE1/15/Gl apologies error must lot modelers out computers already getting mail about article Design Analysis Program Dick Sarpolus Shrewsbury NJ Safety Preston Continued page 20 stated experiencing prob lems some parts country RC cars buggies using frequencies reserved aircraft. Perhaps Davids label suggestion can help alleviate some problems FlutterAnother item mentioned last months Safety column suggestion modeler should man datory checks models prevent con trol surface flutter November 1985 issue Corsair newsletter Joint Military R/G Fliers Club editor Marlin Kinning article flutter written noted modeler Cliff Weirick benefit readers may know what flutter can model Im reproducing Cliffs article FLUTTER Most know what seem some fliers dontor dont care break flutter down two levels full blown FLUTTER very destructive force second BUZZ Buzz too very destructive force slightly dif ferent way Lets look FLUTTER first can destroy airplane quicker can blink eye can attack sur face plane its prime targets ailerons followed closely elevator rudder flutter starts matter time until surface itself leaves plane takes sur face attached case two wings elevator counts up three airplanes stunt job wing failure next two Formula Ones Another aileron wing other elevator Actu ally very famousor should say infamouscrash lot oldtimers will remember Nats Los Alamitos NAS Boy what mess Now know what flutter can lets think about BUZZ hard describe because cant hear power model unless engine dead can hear flutter loud est engines whining away Buzz tends destroy servosand ultimately plane tends ruin gears worse yet attacks feedback pot ser vo does wearing small area usually around level-flight neutral position happens wonder sometimes controls may act funny What causes buzz Primarily two things Loose control surfaces sloppy tail-heavy loose sloppy pushrods etc see control surfaces look ready fall off airplane yet pilots ignore Same way pushrods Some builders drill %2-in holes control horn use 46-in wire Thats really asking sum up check things time go out fly remem ber tight will wear out get loose Have safe moath John Preston 12235 Tildenwood Dr Rockville MD 20852 responding advertisers mention read aboutthem ModelAviation drivers fuel pumps rolled aisles over power panels gallon fuel cans transmitter tray must got hand-held units Field boxes heavy wacky high-techand prop can cost seven bucks about power panel under nose run engines fancy hinged lids prevent getting anything plane figure top wedding cake ends up ground crawling aroundeasier get ting up down like jive puppet Im back knees now cant get up Legs no legs question Bill H Greenhalgh man after own heart dont have ambition brains too suffering herd guy lives place called Wetumpka Alabama must have right stuff am another old coot Au Good name next modeL built first model airplane back 1920s Bill edifies us after 30 years Air Corps/Air Force another 10 years doingthings government heart problem came back modeling After building Sig Kadet bitten RC bug since have built several airplanes mostly scratch Being too old hands knees bit fueling starting airplanes put folding legs huge field box raise level permitted work standing position course field box/stand weighed much took two us move After building some plant stands PVC plastic pipe wife realized could have light field stand could handle easily comfort several months now have using stand shown enclosed photographs Built 1-in PVC pipe consists two ends two shelves supports airplane fastened ends bolts wing nuts permitting quicikly change fit different fuselages padding fuselage supports insulation sold PVC pipes 1 22 Model Aviation Plane Talk/Winter Continued page 37 two shelves simply two straight pipes held together sheet hardboard shelves ends joined spring clips shown pictures whole thing disassembles quickly fit car trunks room spare usually leave assembled carry airplane van Once decided sizes wanted figured out parts list construction took less hour expenditure less $10 field stand doubles great work stand shop stand problem solved turned problem equipment carried old field box Using scrap plywood built three boxes fueling box carries half-gallon plastic fuel tank 12-volt battery electric fuel pump starter box includes 12-volt battery power panel storage space glow plugs small tools electric starter tool box has drawer small tools parts storage compartments spare propellers larger tools equip ment cleaning equipment other essential items seldom needed put cleats ends bottom box fit over shelves keep boxes vibrating off shelf boxes quite light easily handled two 12-volt batteries provide back up prevent loss flying session forget charge Add folding chair jug coffee iced tea depending upon tempera ture have makings com fortable enjoyable flying session know youngsters will sneer such sissy stuff thought would pass along whatever worth hope will interest some other old-timers senior citizens seem coming RC hobby simplifi cation equipment might ensure sustained interest pleasant flying field conditions Thus spake Bill Greenhalgh Wetump ka AL Favor requested Will something cause close heart February 1986 ModelAirplane News Hal deBolt began new long-needed feature Golden Age RC has making long time us have put heads together help make possible always wanted self colunm specifically RC have interest Antique OldTimer modeling SAM Society Antique Modelers makes go Thats primarily based old Free Flight models RC-assist involved interest Old-Timer Control Line models obvious potential RC its own right has neglecteduntil now know 1950s 6-ft 35powered Smog Hog example does anything can Saturday Night Specialexcept go straight up Its easier safer fly things flown now came low-wing Smog Hog Sig Mfg Co perceived Kasmirski 45-powered Orion 1960 Aero batics World Champion still matches performance modern engine anything can think hot aerobatic airplane hundreds published once-kitted wonderful air planesdeltas canards name Ob viously an Antique era OldTimer era Nostalgic erastarting things like Goods Big Guff prewar days Taurus Orion 1960 Buzzard Bombshells could promote competitions aware majority will prefer simply enjoy flying historic planes Please contribute Hals column us hundreds pictures out Send background info Harold deBolt 2206 Greenwich Dr Kings Pt Sun City Center FL 33570 Without contributions column like deBolts cannot continued indefi nitely Photographic examples particular needed Falcon OldTimer dating late SOs Beams Esquires H-Rays Berkeleys Hollinger J 3 Fairchild PT on Walt Goods series history Radio Control began last month Chet Lanzo has asked help major presentation 1934 RC-1 prehistoric radio gear People keep building Krackerjac Rookie designers have same experience Beyond historic stuff now appearing magazine no continuity except deBolts Golden Age thing requires everyone interested assure prospers pictures good information Mining gold depends have gratitude joining effort Before long youll have yourself thank having bothered Bill Winter 4432 Altura Ct Fajifax VA 22030 Radio Technique/Myers Continued page 38 buy products object will likely accompanied warning literature manufacturer will receptive constructive criticism object being sold lacks such obvious liability/litigation potential manufacturers interest usually concen trates itself price profit performed static structural load test airplanes towhook/fuselage/wing combination Jugs water provided test load pint water weighs pound Note done before wing covered wing should depend covering strength sides something cracks want see well hear wing spar strong enough Only dowel needed changed Continued page 126 April 1986 123 C C El I m z 0 z z C 0 0 m I m 0 q 0 CD C 0 0 C -4 0 CD 0 Co U 0 -L N 0 0 01 x x N
Edition: Model Aviation - 1986/04
Page Numbers: 30, 31, 32, 33, 34, 36, 37, 122, 123
Bill Winter _____T12ILX E1Z0 0 Plane Talk Left Leading off Al Backstroms tailless fantasies Hoffman Wing follow-up Arup remember Smilin Jack comic strip Hoffman chief engineer Very stable model manyflights rubber now perks CO-2 Configuration less sensitive CG shifts conventional planes Tips ailerons Winter drawing large possible RC Right all-sheet Waterman Aerobile taughtAl iittl@ because always flew well Did 4Osec indoors its third flight now worn out flying ceiling hits Al has bigger built-up glow version Winterthinks RCM published RC Full-size plane Guggenheim Safety Plane competition 30s Above Lipplach Delta precursor postwar delta fighters High aspect ratio makes model extremely hard adjust Large props OK pusher tractor version Delta II would tolerate power burstof a4-in prop Both flew notwell Buildercon alders flops Right Backatroms model own successful full-scale plank Best flier series does 60 sec Cat site Left tractor stick isa tailless version Dr Lippiachs semi-ground-effect machine has flown several times never ROW Intended Right Backatroms neat Peanut Nicuport 11 Nowlen Aero kit experimental jobs displays nifty work manship nonetheless Nieuport consistently turns pretty flights though long duration Backatrom would like 30 Model Aviation L1JiJ~ FIG NOTE Long short wing versions FIG C 11 III / I/ Final version Backstroms pusher-engined plank has 110 flIght hours Insert side view tip fin isa drag rudderwhich hinges outward Dick Johnsons engine concept 16- 20-hp twin belt-driven countershaft top-mounted prop larger side view shows reflex alrfoli pusher props thrust line I Future possIbilities could include twin having delta-shaped center section area profile sketch shows airfoils thrust lines As planned two Johnsons twin-cylinder engines would used turning singie-biaded Evereil propellers TWILIGHT ZONE Lincoln Beachey glamour pilot early century said Give barn door Twill fly Al Backstrom would horrified being compared immortal Beachey indeed quite mortalgoing out boots thrilling multitudes San Francisco Golden Gate Exposition 1915 Al designs flies full-scale planks Planks go way back notably Europe Backstroms addiction finicky birds both gliders powered has found attention home-builders long involvement fringe-stuff models similarly reflects lifetime fascination gliders tailless aircraft Whats plank As see drawings plank usually paralleledged wing tailless generally assumed have no sweep heavily reflexed airfoil makes stable Well concentrate full-scale work Backstrom friends Backstrom finds No-Cal rubber-pow ered quickies especially useful look bit rough dont fooled include Nieuport 11 Peanut show capability modeling approach no fuss no feathers modeling inspired Air Trails late 30s AT covers things like Zanonia Bowlus sailplanes fired imagination articles about Northrop wings other novelties such Waterman Arrowbile convinced him such designs would fly models During epic interruption NW II became first student proposed gliding school shootingwas overthatfallofl945but EPB-iC 1965FiG D Al Cleaves 1965 modifications Backstroms 1954 EPB-1 glider uses center fin/rudder Winter says guestimating sport model hed expect CG close 15% chord hed use 5 dihedrai three-channel version 3 ailerons used modei would probably need aft vertical area especially ailerons April 1986 31 sent Pacific 1946 drifted joining Northrops engineering school 1947 saw flights huge Northrop XB-49 jet-powered bomber flying wing 1948 Chance-Vought produced Cutlass standard Navy carrier jet fighter swept-wing tail less 1950 enrolled Aero Engineering Department Mississippi State junior senior years specialized studies tailless craft Vought worked prototype Regulus cruise-type mis sile along way acquiring share Bowlusand earning commercial glider rating last two-digit US Silver Badge Soaring Mississippi studies concluded plank config uration best try Mississippi State place days Al came under influence Gus Raspet formed lifetime associa tion avid modeler full-scale flier Dick Johnson knew Gus inquisitive genius sat him basement Long Island home cigar box small hole side Hed blow cigarette smoke box close lid gently tap far side box Lovely expanding smoke rings traveled like procession ghosts across room What doing Search blowing smoke probably Mississippi commercial aircraft makers embarrassed superb performance Wittmans Tailwind Gus obtained plane Wittman took off prop covered thing tufts show airflow towed make studies experimented blown wings kind fan wing powered separate power source believe approach power plant failed giving fatal case asym metric lift Gus fine sailplane pilot Back Vought early SOs Backstrom doodled 36-ft plank aspect ratio 9-plus profile test model flew well enough demonstrate soaring potential impressed associates said Lets build 1954 26-ft 5in EPB-1 flying 1 956the ship good enough students few solo hours fly well famous pilots like Paul MacCready Gossamer fame Dick Schreder Paul Bickle Ted Jancrarek developed aerobatic routines flew air shows plank Building powered version done Van White director Experimental Aircraft Assn Dick Johnson engine genius Plans sold least several EPB-1As showed up beginning Suffice say comprehensive article appearead Bungee Cord summer 1981 issue various powered variations theme published SportAviation February 1976 February 1980 latter included full-color center spread Having unmercifully meat-axed vast material hoped nevertheless drawings will tickle fancy inspire daring create good-flying conversa tion pieces should fun Radio Control would dare say keep under control Wing loading tease have thing about wing loadings business dividing gross weight ounces square feet area Example 72 oz divided 4 sq ft equals 18 oz per sq ft loading Since little planes flit bigger ones fly nicely assumption best wing loading across board valid increas ingly useless wide variations scale things Ive wished print pundits would plot handy way us pinpoint realistic wing loading match designs think weights Jim Walkers Sonic Control Glider held Jim appeared 1954 Air Trails Annual flight photo showed Jim biowing through big party-type horn piane guidance subject mooing cows things sharing frequency Structural shot right emphasizes loveiy iines slmpiicity Note gussets used today Giant Scaic Jim found covering loose wouldnt act like drum 32 Model Aviation ~reate own oia-timerr JCTT Mcammant Cioud Nine original CA Special Enya powered three channels 4 lb 58-in span Finish Koverall Sig dope old-style 29 square Intake cost him 810 guy didnt like Jeff does snaps fun stuff under SOft Features lifting tail big ventral fin knock-off gear downthrust rock-back dihedral centerline front dowel stringered top oh big windows Finding field boxes heavy enough get banned some hIgnwa uruunnuiun devised stand lightweight 1-in PVC pipe Disassembles quit V Ig Tint car trunks its often transported plane place van Various easy-to-carry support boxes used required round out setup Plc right shows spring clips holding sembly together Plane left plc may Big Bird featured RCM some years back sizes suspect missing link ABC stuff aerodynamicist Two readers make interesting remarks pique hackers curiosity Like great majority cant bothered would know digest available material fiddle pocket calcu lator Thats reason think ing nice would someone caine up useful curves could pinned shop wall Roy Strader teethed ROGs 1929 Now Rubber Scale Old-Timers Antiques offers .. just rambling resume some items have thinking about discussing About some differences per formance size reduced increased think forget wing craft three-dimensional item wing dimensions doubled volume increased eight-fold makes quite difference volume air wing displaces course reducing wing dimensions has same effect other direction foregoing does explain what happens wing dimensions changed dont know details changes least before changes made OK think two-dimensional good enough everyday flying threedimensional Cube square exact Does Roy mean aspect ratio changing wing dimensions goes item called span loading Au referred span loading too pounds sup ported perfoot span ounces per inch foot fyou fiddle tiny models craft some designers seem ignore both design models fullscale aircraft Piper started trend Pacer its low aspect-ratio wing suppose interests cost andweight Some EAAers go same route designs seem surprised performance increase add couple feet wings span Well course EAAers add span increase aspect ratio wing area thereby also reduce wing loading Roys point aspect ratio know dont want high-drag 5-to-i wing championship Sailplane Piper may have other thoughts well Pacer older Pipers prior chubby Vagabond followed Pacer TnPacer long-winged Piper arrived cleaned-up Super Cruiser cowled Cubs became necessary truly slow up approach holding nose highfuse lage parallel horizonto increase sink rate could overshoot pretty long runway ground effect Flaps appeared later Super Cruisers Pacer landed like real airplane say settled solidly did float like J-3s T-Crafts bumpy days highaspect jobs gave rough ride whereas low-aspect Pacer TnPacer et al smoothed things out comparison higher span loading loose similarity model ing would Monarch Kadet Strader has valid points Now meet Jeff McCammant editor Marshailtown RCers Flyer extro verted ancient born dissenter comes like Midwestern tornado RC four years has several thousand words wild fun stuff first nocent paragraph has compass spinning like Cox 010which say about 30000 rpm Wing loadings wing loadings gins scaling up down Well happened upon enlightening article Ron St Jean says incorrectly considering relationship scale up down air holds wing aloft scale-up square Two dimensional Yet atmosphere three-dimensional cube Basically St Jean says consider wing loading consider loading per cubic inch volume wing occupies send copy Judge yourself think awe-inspiring especially look charts speak truth article St Jean blank now although editor appeared August 1959 MAN Free Flighters know St Jean famous Ramrod FF also MAN Ron cool cat just lately developed Nordics latemodel FFs using simple composites frameless flying surfaces light strong Rons Wing Loading Three-Dimen sional article major feature graphs demonstrate dramatically precision three-dimensional wing loading applies sizes weights models two four charts will see some pundit did provide 1959 curve always wanted Perhaps can ask MAN make Xerox copies pages 22 23 41 44 two additional pages back book material page numbers appear McCammants copies urge MANs editor republish sig nificant report subject universal important RC ironic twist wondered about charting wing loading curve values increasing scale Continued page 34 tables two four appeared August1959 issue ModeIAiiplane News article Ron St Jean entitled Wing Load ing Three Dimensional Ramrod Free Flight model numbers indicate wing areas sizes having similar glides Fig 1 shows great variations loading according traditional two-dimensional calculations Fig 2 shows almost identical loadings figured three dimensionally Winterfeels material significant designers including RC foraccurate relationships scaling up down April 1986 33 Like CAP 21 lathe stab prove validity flying wings Bill Evans uses elevons rudder control full aerobatics pattern 72-In bird 05 61 Capacitive Discharge Ignition CH Electronics Breakerless CD Ignition System can installed engine 15 large chainsaw type new 90 15 twa four stroke engines perfect far converting CH Ignition system new kits plans airplanes just becoming available perfect size engine Four stroke engines beautiful ign Detonation death four stroke enginewhen control engine timing can stop detonation makes engine run much cooler & develops power-plus no kickback 8 very low idle CH system used engine expertsMaynard Hill George Aidridge Doran Hiatt Cliff Bennett Otto Bernhart Maynard Hill used CH system last two world records Available two four stroke engines single twin cylinder Throttle Coupled Spark Advance kits available far popular engines Custom engine set-up available Call write price quote Now fETC electronic timing control information brochure price list send $1 00 CH Electronics Inc MODEL MOTOR MUGTM high quality totally glazed ceramic engine mug must modeler Standing 51/ inches tall large 10 oz capacity its real attention getter definite collectors piece years come OnlyPlus $200 postage $695and handling per order CA residents add sales tax Box 1732 Riverton WY 82501 Phone 307-8576897 REPLACEMENT PARTS FOR Kraft Engines Thator/ McCoy TaIpan 40 RJL ENGINES Call Only Factory Source RJL INDUSTRIES Free Parts Catalog Available increased looking right-hand column Fig 2 wing loading terms oz/cu ft value increases note cube square appear fall straight line curve think will quit am still behind Said St Jean mewhat surprised find recent years As could did glide well C jobs come wondered What happened Reynolds Number repealed small engines become much hotter size larger engines did fact old wing loading rule abolished have something check out latter possibility Ron continued computed wing loadings Ramrod fleet coming up information Fig 1 As can seen tables very definite progression evident small models having much lower wing loading large ones yet glides sinking speeds dif ferent-sized Ramrods pretty much same felt found answer certainly didnt understand until day hit us like bolt years have thinking wing loading terms much per square something other wing two-dimensional thing threedimensional loading should figured volume area basis has chord span thickness well test hypothesis quickly checked out calculating wing loading much per cubic inch rather square inch make measure wing volume first determined actual rib area typical Ramrod wing section divided chord area value order arrive measure average thickness Multiplying average thickness particular wing its area would produce volume cubic inches As shown table dividing weight ounces figure gives us threedimensional cubic wing loading ounces per cubic inch various-sized Ramrods Fig 2 As can seen table cubic wing loading almost identical through various sizes since models have addition equivalent gliding ability statement principle seems order scaling design different size retain same glide wing volume should made directly proportional weight Au Italics since dealing same design can make weight propor tional cube span 3/2 power area square root area cubed results same important thing being put measure wing three-dimensional terms now apparent us figuring wing loading ounces per square foot square inch useful measure Continued page 36 34 Model Aviation r RIL Industries ox 5654 dena CA 91107 Phone 818 359-0016 iLJL1 L LLL 13311 Beach Ave na Del Rey CA 1J 1-624 0@00000so@oso@o@o@o@o@o@O L VIDEO 0 HOBBY RETAILERSS Answer YesI 0 4 ESPONSE YOUR OVERWELMING0 DEMANDS WE NOW HAVE SOLID DEALERQ PLAN EXCLUSIVELY FOR YOUI YOU CAN NOW RENT OR SELL OUR VIDEO PROGRAMS FOR UNLIMITED PROFITS HERE IS INVESTMENT THAT PAYS FOR ITSELF WHILE PAYING YOUR CASH PROFITS AMONG OTHERS Q WHAT ELSE DO YOU HAVE IN YOUR STORE THAT DOES THIS WITH OUR EXTREMELY POPULAR LANE FUNNIES IN YOUR VIDEO UNEUP ADDITIONAL PROFITS CAN BE IN YOUR CASH W DRAWER AS SOON AS NEXT WEEK IF YOU ACT NOWI LETS FACE IT THE BOlTOM LINE IS Q MAKING MONEYI COMPLETE PLAN DETAILS AND SPECIAL LOW INTRODUCTORY PRICE ARE READY TO BE SENT JUST MAIL OR PHONE IN YOUR INOUIRY NOWI Send Inquiries W ACADEMY OF AVIATION RESEARCH & DEVELOPMENT PO Box 277 Hazel Crest IL 60429-0277 13121 335-O7 0@@ 00 ATT-CHEKi ON-Board Battery Tester Saves Time. Saves Models BATT-CHEK RX-1 $1495 n USA NEW Install RC Models Check receiver battery status press button Small Light 1/2 oz Precise Rugged ORDER TODAY dealer Protune Corp 1914 462-6452 PO Box 1808 Poughkeepsie NY 12601 TARBaby Especially Turn-around 850 sq 120 4 cycle powered Ron Chidgey design smooth solid performer Rib templates computer plotted Plans construc tion hints- $1195 TRANSMITTER CASE An inespensive rugged molded case protect expensive transmitter both two stick single stick transmitters Brown leather grain aluminum trim locking clasp $1895 WING TUBE & SOCKETSNEW WING MOUNTING SET Aluminum alloy tubing plug-inA wing mounting system developed Ron Chidgey wings Included pair ofthat fast neat accurate stays tight Three special slip fit phenolic socketsnylon brackets screws machined wing blocks build wing structureincluded -$695 Now size models 718 dia s 2 $ 8g5 1 dies 2$ gg 1 dia x3 -$1495 P Gator RIO Products 3713 Pompano Dr See Dealer Order Direct Pensacola FL 32514for UPS Phone AC 904 476-8639Include $150 Per Item TORK-STARTER revolutionary concept power iSV glow plugs model cars boats air plenes using glow fuel engines TORK-STARTERITMI has steel wrench strong W enough reduce compression easier starting supplies power doing comes new CuD charger has LED indicate nhe unit charging also has removable T handle can used Torque amplIfier Over 50 consecutive starts full charge rechargeable hundreds times Clips onto plug positive connection Send ad along prepayment receive MFG OF NI-STARTER free shipping handling TORK-STARTER T$2995 Charger NOV 22tV 12V Fast Chartvrl $2995 $2095 Without Charger Charger CHARGERS PLEASE SPECIFY WHICH CHARGER 95 Charger Only WHEN ORDERINGII tOy 220V 12V Fast Chargtrl 12421 Ransom Dr. Glenn Dale MD 20769301 464-2260 comparison between models almost same sizes con sidered real fallacy making wing loading comparisons area basis co-mingling oranges apples speak weight three-dimensional area two-dimensional direct comparison need express terms other will same dimension whether two three Poor Jeff McCanimant writes wonderful letter talk about St Jean Third Dimension Saying modeler since day born beats proud designing own stuff ant-eating own parts building flying alone really blooming extrovert Heres what said about training Being. way am rejected normal way learning fly RC popular way accepted around 40-powered four-channel trainer first differently wanted Sailplane Jeff declares So got Sig Riser Rider put power pod Thats revolutionary No other way fly start engine radio toss climb play land feet again Theres no running get 900-ft highstart line no tow hooks etc taught myself fly Never instructor Now three years later club has people fly Gliders power pods started almost nobody thought flying Gliders Glider gives plenty reaction time Jeff makes sense too am block headed Listen up quiet airstrip Doug Pratt flying simultane ously now Kracketjac new Rookie pennants drooped tennas soft Bahamian air two Enya four-strokes purred quietly impacting dream-world environment yellow low-winger red cabin ship against deep blue sky eight minutes both planes trimmed hands off switched transmitters What rare experience fly two own planes flight different As sun sank beginner never taken off landed himseW appeared RCM 40 knocking knees Doug took oft flew superbly low-key support talk reassuring him fast nicely-banked approaches did flawlessly mentioned flown Gentle Lady didnt count leftright days behind him Thats giant first step Doug said after learned fly MRC Chipmunk Doug years ago snap rolling second flight too flown Gentle Lady same quirk young beginner friends didnt count What Ive talked truly hot-start beginners given truth serum confess good times Gentle Lady others like find myself perplexed strangers ask about getting started usually no help want anything better knowing resistance real primary trainers some stigma cross mental fingers suggest Gentle Lady does have say something power training such models climb slowly mope along good podmounted 049 myself Id put engine nose Its good plane beginning Electrics too Start popular 05 electric motors six 12 Ah Sanyo cells later may want try SR batteries other props cells folders cobalt motors reduction drives etc keep start simple going swallow tub-thumping jargon argot insist fast 40powered animal four channels little forgiveness thats fine sellers accessories include certified instructor great communicator under stands children work living youll have wait instructor busy Sunday good guys similarly desperate fly youll wallflower fruitless Sundays ticking away like taxi meterif active site busy club However learn solo yourself path easier have flown form model past wont let fly site until youve demonstrated proper solo flight Few instructors able willing give feel flight itself understand inner nature little beasts begin Glider select kit shows rigging power pod Thrust lines important example nose-mounted glow engine electric mo tor will require downthrust model will stall easily under power spells sloppy flight floundering con trol under power airspeed higher design speed Glider producing excess lift downthrust counteracts excess lift nose-mounted power source will need least 20 down maybe 40 50 pod engine motor high above both center gravity center drag has effect similar downthrust may enough paraphrase Will Rogers said never met man didnt like never met field box 1 did like Life simple doorbell battery Pandoras shoebox jug wine gas/oil 5% glow thou airplane 1950 guy named Broadfield discovered later have big manufacturer balsa gliders ROGs during 20s appeared Long Island field field box detachable legs man didnt come down trees got off knees standup starting two U-shaped saddle pieces inserted hold model days box standing crosswind light 6-ft cabin ship top often blew over after-shock splintering noises ol boy gifted bunch us boxes cried foul bills arrived Can imagine gall Seven bucks came starters wet cells glow Continued page 122 Youli Soar Unimagined Heights Now can build paper airplanes fly high far masters Paper Airplane Book official book Second Great International Paper Airplane Contest Youll get tips winners blueprints prize winning designs instructions build own high-flying planes Learn Secrets Japanese Air Superiority reason Japanese hold paper airplane records paper use Its never available count. until now including enough sheets exclusive paper make several models own Prepared editors Science 86 Paper Airplane Book beautifully designed high-quality photography winning entries Second Great International Paper Airplane Contest Its perfect gift paper pilots ages Special Offer Science 86 Through special arrangement Random House Science 86 now accepting orders PaperAirplane Book just $895 order copies just fill coupon below mail us check money order Please send mecopies PaperAirplane Book $895 plus $175 postage handling Mail tO Science 86 Airplane Book PO Box 10982 'DesMoines Iowa 50340 Total amount order $________ D Enclosed check money order made payable Science 86 Eli Please charge my[]Visa MasterCard rn Date Siomt,rp Address City State 7in Please allow 46 weeks delivery Outside U5Aadd $250 PAB-MA486 April 1986 37 PILOTS TS RIOR TS T THE MOST SUPERIOR PILOT FIGURE ON THE MARKET LIGHTEST WEIGHT MOST REALISTIC AVAILABLE GIVE YOUR PLANE PILOT FOR YOUR NEWEST OLDEST OR NEXT CREATION R YOURS TODAY FULL FIGURES CIVILIANWWII MILITARY 1/3 Scale $19951/5 Navy $1395 1/4 Scale14951/6AAF1195 1 /5 Scale1295 Plus 1/12 Scale895$250 shipping 1/12 Chopper 895each figure KNIGHTS OF THE AIR 1400 Rte 22 West Friendship MD 21794 301-489-5050 Letters Editor Continued page 12 compiling error having gone undetected long quantity E1115/61 usually much smaller quantity L*S2/Sl As such little error pro duced used probably noticed attributed geometric variations actual model Mr Donatelli found error may have used design di mensions producing severe imbab ance So Line 760 should read PL*S2/SlE1/15/Gl apologies error must lot modelers out computers already getting mail about article Design Analysis Program Dick Sarpolus Shrewsbury NJ Safety Preston Continued page 20 stated experiencing prob lems some parts country RC cars buggies using frequencies reserved aircraft. Perhaps Davids label suggestion can help alleviate some problems FlutterAnother item mentioned last months Safety column suggestion modeler should man datory checks models prevent con trol surface flutter November 1985 issue Corsair newsletter Joint Military R/G Fliers Club editor Marlin Kinning article flutter written noted modeler Cliff Weirick benefit readers may know what flutter can model Im reproducing Cliffs article FLUTTER Most know what seem some fliers dontor dont care break flutter down two levels full blown FLUTTER very destructive force second BUZZ Buzz too very destructive force slightly dif ferent way Lets look FLUTTER first can destroy airplane quicker can blink eye can attack sur face plane its prime targets ailerons followed closely elevator rudder flutter starts matter time until surface itself leaves plane takes sur face attached case two wings elevator counts up three airplanes stunt job wing failure next two Formula Ones Another aileron wing other elevator Actu ally very famousor should say infamouscrash lot oldtimers will remember Nats Los Alamitos NAS Boy what mess Now know what flutter can lets think about BUZZ hard describe because cant hear power model unless engine dead can hear flutter loud est engines whining away Buzz tends destroy servosand ultimately plane tends ruin gears worse yet attacks feedback pot ser vo does wearing small area usually around level-flight neutral position happens wonder sometimes controls may act funny What causes buzz Primarily two things Loose control surfaces sloppy tail-heavy loose sloppy pushrods etc see control surfaces look ready fall off airplane yet pilots ignore Same way pushrods Some builders drill %2-in holes control horn use 46-in wire Thats really asking sum up check things time go out fly remem ber tight will wear out get loose Have safe moath John Preston 12235 Tildenwood Dr Rockville MD 20852 responding advertisers mention read aboutthem ModelAviation drivers fuel pumps rolled aisles over power panels gallon fuel cans transmitter tray must got hand-held units Field boxes heavy wacky high-techand prop can cost seven bucks about power panel under nose run engines fancy hinged lids prevent getting anything plane figure top wedding cake ends up ground crawling aroundeasier get ting up down like jive puppet Im back knees now cant get up Legs no legs question Bill H Greenhalgh man after own heart dont have ambition brains too suffering herd guy lives place called Wetumpka Alabama must have right stuff am another old coot Au Good name next modeL built first model airplane back 1920s Bill edifies us after 30 years Air Corps/Air Force another 10 years doingthings government heart problem came back modeling After building Sig Kadet bitten RC bug since have built several airplanes mostly scratch Being too old hands knees bit fueling starting airplanes put folding legs huge field box raise level permitted work standing position course field box/stand weighed much took two us move After building some plant stands PVC plastic pipe wife realized could have light field stand could handle easily comfort several months now have using stand shown enclosed photographs Built 1-in PVC pipe consists two ends two shelves supports airplane fastened ends bolts wing nuts permitting quicikly change fit different fuselages padding fuselage supports insulation sold PVC pipes 1 22 Model Aviation Plane Talk/Winter Continued page 37 two shelves simply two straight pipes held together sheet hardboard shelves ends joined spring clips shown pictures whole thing disassembles quickly fit car trunks room spare usually leave assembled carry airplane van Once decided sizes wanted figured out parts list construction took less hour expenditure less $10 field stand doubles great work stand shop stand problem solved turned problem equipment carried old field box Using scrap plywood built three boxes fueling box carries half-gallon plastic fuel tank 12-volt battery electric fuel pump starter box includes 12-volt battery power panel storage space glow plugs small tools electric starter tool box has drawer small tools parts storage compartments spare propellers larger tools equip ment cleaning equipment other essential items seldom needed put cleats ends bottom box fit over shelves keep boxes vibrating off shelf boxes quite light easily handled two 12-volt batteries provide back up prevent loss flying session forget charge Add folding chair jug coffee iced tea depending upon tempera ture have makings com fortable enjoyable flying session know youngsters will sneer such sissy stuff thought would pass along whatever worth hope will interest some other old-timers senior citizens seem coming RC hobby simplifi cation equipment might ensure sustained interest pleasant flying field conditions Thus spake Bill Greenhalgh Wetump ka AL Favor requested Will something cause close heart February 1986 ModelAirplane News Hal deBolt began new long-needed feature Golden Age RC has making long time us have put heads together help make possible always wanted self colunm specifically RC have interest Antique OldTimer modeling SAM Society Antique Modelers makes go Thats primarily based old Free Flight models RC-assist involved interest Old-Timer Control Line models obvious potential RC its own right has neglecteduntil now know 1950s 6-ft 35powered Smog Hog example does anything can Saturday Night Specialexcept go straight up Its easier safer fly things flown now came low-wing Smog Hog Sig Mfg Co perceived Kasmirski 45-powered Orion 1960 Aero batics World Champion still matches performance modern engine anything can think hot aerobatic airplane hundreds published once-kitted wonderful air planesdeltas canards name Ob viously an Antique era OldTimer era Nostalgic erastarting things like Goods Big Guff prewar days Taurus Orion 1960 Buzzard Bombshells could promote competitions aware majority will prefer simply enjoy flying historic planes Please contribute Hals column us hundreds pictures out Send background info Harold deBolt 2206 Greenwich Dr Kings Pt Sun City Center FL 33570 Without contributions column like deBolts cannot continued indefi nitely Photographic examples particular needed Falcon OldTimer dating late SOs Beams Esquires H-Rays Berkeleys Hollinger J 3 Fairchild PT on Walt Goods series history Radio Control began last month Chet Lanzo has asked help major presentation 1934 RC-1 prehistoric radio gear People keep building Krackerjac Rookie designers have same experience Beyond historic stuff now appearing magazine no continuity except deBolts Golden Age thing requires everyone interested assure prospers pictures good information Mining gold depends have gratitude joining effort Before long youll have yourself thank having bothered Bill Winter 4432 Altura Ct Fajifax VA 22030 Radio Technique/Myers Continued page 38 buy products object will likely accompanied warning literature manufacturer will receptive constructive criticism object being sold lacks such obvious liability/litigation potential manufacturers interest usually concen trates itself price profit performed static structural load test airplanes towhook/fuselage/wing combination Jugs water provided test load pint water weighs pound Note done before wing covered wing should depend covering strength sides something cracks want see well hear wing spar strong enough Only dowel needed changed Continued page 126 April 1986 123 C C El I m z 0 z z C 0 0 m I m 0 q 0 CD C 0 0 C -4 0 CD 0 Co U 0 -L N 0 0 01 x x N
Edition: Model Aviation - 1986/04
Page Numbers: 30, 31, 32, 33, 34, 36, 37, 122, 123
Bill Winter _____T12ILX E1Z0 0 Plane Talk Left Leading off Al Backstroms tailless fantasies Hoffman Wing follow-up Arup remember Smilin Jack comic strip Hoffman chief engineer Very stable model manyflights rubber now perks CO-2 Configuration less sensitive CG shifts conventional planes Tips ailerons Winter drawing large possible RC Right all-sheet Waterman Aerobile taughtAl iittl@ because always flew well Did 4Osec indoors its third flight now worn out flying ceiling hits Al has bigger built-up glow version Winterthinks RCM published RC Full-size plane Guggenheim Safety Plane competition 30s Above Lipplach Delta precursor postwar delta fighters High aspect ratio makes model extremely hard adjust Large props OK pusher tractor version Delta II would tolerate power burstof a4-in prop Both flew notwell Buildercon alders flops Right Backatroms model own successful full-scale plank Best flier series does 60 sec Cat site Left tractor stick isa tailless version Dr Lippiachs semi-ground-effect machine has flown several times never ROW Intended Right Backatroms neat Peanut Nicuport 11 Nowlen Aero kit experimental jobs displays nifty work manship nonetheless Nieuport consistently turns pretty flights though long duration Backatrom would like 30 Model Aviation L1JiJ~ FIG NOTE Long short wing versions FIG C 11 III / I/ Final version Backstroms pusher-engined plank has 110 flIght hours Insert side view tip fin isa drag rudderwhich hinges outward Dick Johnsons engine concept 16- 20-hp twin belt-driven countershaft top-mounted prop larger side view shows reflex alrfoli pusher props thrust line I Future possIbilities could include twin having delta-shaped center section area profile sketch shows airfoils thrust lines As planned two Johnsons twin-cylinder engines would used turning singie-biaded Evereil propellers TWILIGHT ZONE Lincoln Beachey glamour pilot early century said Give barn door Twill fly Al Backstrom would horrified being compared immortal Beachey indeed quite mortalgoing out boots thrilling multitudes San Francisco Golden Gate Exposition 1915 Al designs flies full-scale planks Planks go way back notably Europe Backstroms addiction finicky birds both gliders powered has found attention home-builders long involvement fringe-stuff models similarly reflects lifetime fascination gliders tailless aircraft Whats plank As see drawings plank usually paralleledged wing tailless generally assumed have no sweep heavily reflexed airfoil makes stable Well concentrate full-scale work Backstrom friends Backstrom finds No-Cal rubber-pow ered quickies especially useful look bit rough dont fooled include Nieuport 11 Peanut show capability modeling approach no fuss no feathers modeling inspired Air Trails late 30s AT covers things like Zanonia Bowlus sailplanes fired imagination articles about Northrop wings other novelties such Waterman Arrowbile convinced him such designs would fly models During epic interruption NW II became first student proposed gliding school shootingwas overthatfallofl945but EPB-iC 1965FiG D Al Cleaves 1965 modifications Backstroms 1954 EPB-1 glider uses center fin/rudder Winter says guestimating sport model hed expect CG close 15% chord hed use 5 dihedrai three-channel version 3 ailerons used modei would probably need aft vertical area especially ailerons April 1986 31 sent Pacific 1946 drifted joining Northrops engineering school 1947 saw flights huge Northrop XB-49 jet-powered bomber flying wing 1948 Chance-Vought produced Cutlass standard Navy carrier jet fighter swept-wing tail less 1950 enrolled Aero Engineering Department Mississippi State junior senior years specialized studies tailless craft Vought worked prototype Regulus cruise-type mis sile along way acquiring share Bowlusand earning commercial glider rating last two-digit US Silver Badge Soaring Mississippi studies concluded plank config uration best try Mississippi State place days Al came under influence Gus Raspet formed lifetime associa tion avid modeler full-scale flier Dick Johnson knew Gus inquisitive genius sat him basement Long Island home cigar box small hole side Hed blow cigarette smoke box close lid gently tap far side box Lovely expanding smoke rings traveled like procession ghosts across room What doing Search blowing smoke probably Mississippi commercial aircraft makers embarrassed superb performance Wittmans Tailwind Gus obtained plane Wittman took off prop covered thing tufts show airflow towed make studies experimented blown wings kind fan wing powered separate power source believe approach power plant failed giving fatal case asym metric lift Gus fine sailplane pilot Back Vought early SOs Backstrom doodled 36-ft plank aspect ratio 9-plus profile test model flew well enough demonstrate soaring potential impressed associates said Lets build 1954 26-ft 5in EPB-1 flying 1 956the ship good enough students few solo hours fly well famous pilots like Paul MacCready Gossamer fame Dick Schreder Paul Bickle Ted Jancrarek developed aerobatic routines flew air shows plank Building powered version done Van White director Experimental Aircraft Assn Dick Johnson engine genius Plans sold least several EPB-1As showed up beginning Suffice say comprehensive article appearead Bungee Cord summer 1981 issue various powered variations theme published SportAviation February 1976 February 1980 latter included full-color center spread Having unmercifully meat-axed vast material hoped nevertheless drawings will tickle fancy inspire daring create good-flying conversa tion pieces should fun Radio Control would dare say keep under control Wing loading tease have thing about wing loadings business dividing gross weight ounces square feet area Example 72 oz divided 4 sq ft equals 18 oz per sq ft loading Since little planes flit bigger ones fly nicely assumption best wing loading across board valid increas ingly useless wide variations scale things Ive wished print pundits would plot handy way us pinpoint realistic wing loading match designs think weights Jim Walkers Sonic Control Glider held Jim appeared 1954 Air Trails Annual flight photo showed Jim biowing through big party-type horn piane guidance subject mooing cows things sharing frequency Structural shot right emphasizes loveiy iines slmpiicity Note gussets used today Giant Scaic Jim found covering loose wouldnt act like drum 32 Model Aviation ~reate own oia-timerr JCTT Mcammant Cioud Nine original CA Special Enya powered three channels 4 lb 58-in span Finish Koverall Sig dope old-style 29 square Intake cost him 810 guy didnt like Jeff does snaps fun stuff under SOft Features lifting tail big ventral fin knock-off gear downthrust rock-back dihedral centerline front dowel stringered top oh big windows Finding field boxes heavy enough get banned some hIgnwa uruunnuiun devised stand lightweight 1-in PVC pipe Disassembles quit V Ig Tint car trunks its often transported plane place van Various easy-to-carry support boxes used required round out setup Plc right shows spring clips holding sembly together Plane left plc may Big Bird featured RCM some years back sizes suspect missing link ABC stuff aerodynamicist Two readers make interesting remarks pique hackers curiosity Like great majority cant bothered would know digest available material fiddle pocket calcu lator Thats reason think ing nice would someone caine up useful curves could pinned shop wall Roy Strader teethed ROGs 1929 Now Rubber Scale Old-Timers Antiques offers .. just rambling resume some items have thinking about discussing About some differences per formance size reduced increased think forget wing craft three-dimensional item wing dimensions doubled volume increased eight-fold makes quite difference volume air wing displaces course reducing wing dimensions has same effect other direction foregoing does explain what happens wing dimensions changed dont know details changes least before changes made OK think two-dimensional good enough everyday flying threedimensional Cube square exact Does Roy mean aspect ratio changing wing dimensions goes item called span loading Au referred span loading too pounds sup ported perfoot span ounces per inch foot fyou fiddle tiny models craft some designers seem ignore both design models fullscale aircraft Piper started trend Pacer its low aspect-ratio wing suppose interests cost andweight Some EAAers go same route designs seem surprised performance increase add couple feet wings span Well course EAAers add span increase aspect ratio wing area thereby also reduce wing loading Roys point aspect ratio know dont want high-drag 5-to-i wing championship Sailplane Piper may have other thoughts well Pacer older Pipers prior chubby Vagabond followed Pacer TnPacer long-winged Piper arrived cleaned-up Super Cruiser cowled Cubs became necessary truly slow up approach holding nose highfuse lage parallel horizonto increase sink rate could overshoot pretty long runway ground effect Flaps appeared later Super Cruisers Pacer landed like real airplane say settled solidly did float like J-3s T-Crafts bumpy days highaspect jobs gave rough ride whereas low-aspect Pacer TnPacer et al smoothed things out comparison higher span loading loose similarity model ing would Monarch Kadet Strader has valid points Now meet Jeff McCammant editor Marshailtown RCers Flyer extro verted ancient born dissenter comes like Midwestern tornado RC four years has several thousand words wild fun stuff first nocent paragraph has compass spinning like Cox 010which say about 30000 rpm Wing loadings wing loadings gins scaling up down Well happened upon enlightening article Ron St Jean says incorrectly considering relationship scale up down air holds wing aloft scale-up square Two dimensional Yet atmosphere three-dimensional cube Basically St Jean says consider wing loading consider loading per cubic inch volume wing occupies send copy Judge yourself think awe-inspiring especially look charts speak truth article St Jean blank now although editor appeared August 1959 MAN Free Flighters know St Jean famous Ramrod FF also MAN Ron cool cat just lately developed Nordics latemodel FFs using simple composites frameless flying surfaces light strong Rons Wing Loading Three-Dimen sional article major feature graphs demonstrate dramatically precision three-dimensional wing loading applies sizes weights models two four charts will see some pundit did provide 1959 curve always wanted Perhaps can ask MAN make Xerox copies pages 22 23 41 44 two additional pages back book material page numbers appear McCammants copies urge MANs editor republish sig nificant report subject universal important RC ironic twist wondered about charting wing loading curve values increasing scale Continued page 34 tables two four appeared August1959 issue ModeIAiiplane News article Ron St Jean entitled Wing Load ing Three Dimensional Ramrod Free Flight model numbers indicate wing areas sizes having similar glides Fig 1 shows great variations loading according traditional two-dimensional calculations Fig 2 shows almost identical loadings figured three dimensionally Winterfeels material significant designers including RC foraccurate relationships scaling up down April 1986 33 Like CAP 21 lathe stab prove validity flying wings Bill Evans uses elevons rudder control full aerobatics pattern 72-In bird 05 61 Capacitive Discharge Ignition CH Electronics Breakerless CD Ignition System can installed engine 15 large chainsaw type new 90 15 twa four stroke engines perfect far converting CH Ignition system new kits plans airplanes just becoming available perfect size engine Four stroke engines beautiful ign Detonation death four stroke enginewhen control engine timing can stop detonation makes engine run much cooler & develops power-plus no kickback 8 very low idle CH system used engine expertsMaynard Hill George Aidridge Doran Hiatt Cliff Bennett Otto Bernhart Maynard Hill used CH system last two world records Available two four stroke engines single twin cylinder Throttle Coupled Spark Advance kits available far popular engines Custom engine set-up available Call write price quote Now fETC electronic timing control information brochure price list send $1 00 CH Electronics Inc MODEL MOTOR MUGTM high quality totally glazed ceramic engine mug must modeler Standing 51/ inches tall large 10 oz capacity its real attention getter definite collectors piece years come OnlyPlus $200 postage $695and handling per order CA residents add sales tax Box 1732 Riverton WY 82501 Phone 307-8576897 REPLACEMENT PARTS FOR Kraft Engines Thator/ McCoy TaIpan 40 RJL ENGINES Call Only Factory Source RJL INDUSTRIES Free Parts Catalog Available increased looking right-hand column Fig 2 wing loading terms oz/cu ft value increases note cube square appear fall straight line curve think will quit am still behind Said St Jean mewhat surprised find recent years As could did glide well C jobs come wondered What happened Reynolds Number repealed small engines become much hotter size larger engines did fact old wing loading rule abolished have something check out latter possibility Ron continued computed wing loadings Ramrod fleet coming up information Fig 1 As can seen tables very definite progression evident small models having much lower wing loading large ones yet glides sinking speeds dif ferent-sized Ramrods pretty much same felt found answer certainly didnt understand until day hit us like bolt years have thinking wing loading terms much per square something other wing two-dimensional thing threedimensional loading should figured volume area basis has chord span thickness well test hypothesis quickly checked out calculating wing loading much per cubic inch rather square inch make measure wing volume first determined actual rib area typical Ramrod wing section divided chord area value order arrive measure average thickness Multiplying average thickness particular wing its area would produce volume cubic inches As shown table dividing weight ounces figure gives us threedimensional cubic wing loading ounces per cubic inch various-sized Ramrods Fig 2 As can seen table cubic wing loading almost identical through various sizes since models have addition equivalent gliding ability statement principle seems order scaling design different size retain same glide wing volume should made directly proportional weight Au Italics since dealing same design can make weight propor tional cube span 3/2 power area square root area cubed results same important thing being put measure wing three-dimensional terms now apparent us figuring wing loading ounces per square foot square inch useful measure Continued page 36 34 Model Aviation r RIL Industries ox 5654 dena CA 91107 Phone 818 359-0016 iLJL1 L LLL 13311 Beach Ave na Del Rey CA 1J 1-624 0@00000so@oso@o@o@o@o@o@O L VIDEO 0 HOBBY RETAILERSS Answer YesI 0 4 ESPONSE YOUR OVERWELMING0 DEMANDS WE NOW HAVE SOLID DEALERQ PLAN EXCLUSIVELY FOR YOUI YOU CAN NOW RENT OR SELL OUR VIDEO PROGRAMS FOR UNLIMITED PROFITS HERE IS INVESTMENT THAT PAYS FOR ITSELF WHILE PAYING YOUR CASH PROFITS AMONG OTHERS Q WHAT ELSE DO YOU HAVE IN YOUR STORE THAT DOES THIS WITH OUR EXTREMELY POPULAR LANE FUNNIES IN YOUR VIDEO UNEUP ADDITIONAL PROFITS CAN BE IN YOUR CASH W DRAWER AS SOON AS NEXT WEEK IF YOU ACT NOWI LETS FACE IT THE BOlTOM LINE IS Q MAKING MONEYI COMPLETE PLAN DETAILS AND SPECIAL LOW INTRODUCTORY PRICE ARE READY TO BE SENT JUST MAIL OR PHONE IN YOUR INOUIRY NOWI Send Inquiries W ACADEMY OF AVIATION RESEARCH & DEVELOPMENT PO Box 277 Hazel Crest IL 60429-0277 13121 335-O7 0@@ 00 ATT-CHEKi ON-Board Battery Tester Saves Time. Saves Models BATT-CHEK RX-1 $1495 n USA NEW Install RC Models Check receiver battery status press button Small Light 1/2 oz Precise Rugged ORDER TODAY dealer Protune Corp 1914 462-6452 PO Box 1808 Poughkeepsie NY 12601 TARBaby Especially Turn-around 850 sq 120 4 cycle powered Ron Chidgey design smooth solid performer Rib templates computer plotted Plans construc tion hints- $1195 TRANSMITTER CASE An inespensive rugged molded case protect expensive transmitter both two stick single stick transmitters Brown leather grain aluminum trim locking clasp $1895 WING TUBE & SOCKETSNEW WING MOUNTING SET Aluminum alloy tubing plug-inA wing mounting system developed Ron Chidgey wings Included pair ofthat fast neat accurate stays tight Three special slip fit phenolic socketsnylon brackets screws machined wing blocks build wing structureincluded -$695 Now size models 718 dia s 2 $ 8g5 1 dies 2$ gg 1 dia x3 -$1495 P Gator RIO Products 3713 Pompano Dr See Dealer Order Direct Pensacola FL 32514for UPS Phone AC 904 476-8639Include $150 Per Item TORK-STARTER revolutionary concept power iSV glow plugs model cars boats air plenes using glow fuel engines TORK-STARTERITMI has steel wrench strong W enough reduce compression easier starting supplies power doing comes new CuD charger has LED indicate nhe unit charging also has removable T handle can used Torque amplIfier Over 50 consecutive starts full charge rechargeable hundreds times Clips onto plug positive connection Send ad along prepayment receive MFG OF NI-STARTER free shipping handling TORK-STARTER T$2995 Charger NOV 22tV 12V Fast Chartvrl $2995 $2095 Without Charger Charger CHARGERS PLEASE SPECIFY WHICH CHARGER 95 Charger Only WHEN ORDERINGII tOy 220V 12V Fast Chargtrl 12421 Ransom Dr. Glenn Dale MD 20769301 464-2260 comparison between models almost same sizes con sidered real fallacy making wing loading comparisons area basis co-mingling oranges apples speak weight three-dimensional area two-dimensional direct comparison need express terms other will same dimension whether two three Poor Jeff McCanimant writes wonderful letter talk about St Jean Third Dimension Saying modeler since day born beats proud designing own stuff ant-eating own parts building flying alone really blooming extrovert Heres what said about training Being. way am rejected normal way learning fly RC popular way accepted around 40-powered four-channel trainer first differently wanted Sailplane Jeff declares So got Sig Riser Rider put power pod Thats revolutionary No other way fly start engine radio toss climb play land feet again Theres no running get 900-ft highstart line no tow hooks etc taught myself fly Never instructor Now three years later club has people fly Gliders power pods started almost nobody thought flying Gliders Glider gives plenty reaction time Jeff makes sense too am block headed Listen up quiet airstrip Doug Pratt flying simultane ously now Kracketjac new Rookie pennants drooped tennas soft Bahamian air two Enya four-strokes purred quietly impacting dream-world environment yellow low-winger red cabin ship against deep blue sky eight minutes both planes trimmed hands off switched transmitters What rare experience fly two own planes flight different As sun sank beginner never taken off landed himseW appeared RCM 40 knocking knees Doug took oft flew superbly low-key support talk reassuring him fast nicely-banked approaches did flawlessly mentioned flown Gentle Lady didnt count leftright days behind him Thats giant first step Doug said after learned fly MRC Chipmunk Doug years ago snap rolling second flight too flown Gentle Lady same quirk young beginner friends didnt count What Ive talked truly hot-start beginners given truth serum confess good times Gentle Lady others like find myself perplexed strangers ask about getting started usually no help want anything better knowing resistance real primary trainers some stigma cross mental fingers suggest Gentle Lady does have say something power training such models climb slowly mope along good podmounted 049 myself Id put engine nose Its good plane beginning Electrics too Start popular 05 electric motors six 12 Ah Sanyo cells later may want try SR batteries other props cells folders cobalt motors reduction drives etc keep start simple going swallow tub-thumping jargon argot insist fast 40powered animal four channels little forgiveness thats fine sellers accessories include certified instructor great communicator under stands children work living youll have wait instructor busy Sunday good guys similarly desperate fly youll wallflower fruitless Sundays ticking away like taxi meterif active site busy club However learn solo yourself path easier have flown form model past wont let fly site until youve demonstrated proper solo flight Few instructors able willing give feel flight itself understand inner nature little beasts begin Glider select kit shows rigging power pod Thrust lines important example nose-mounted glow engine electric mo tor will require downthrust model will stall easily under power spells sloppy flight floundering con trol under power airspeed higher design speed Glider producing excess lift downthrust counteracts excess lift nose-mounted power source will need least 20 down maybe 40 50 pod engine motor high above both center gravity center drag has effect similar downthrust may enough paraphrase Will Rogers said never met man didnt like never met field box 1 did like Life simple doorbell battery Pandoras shoebox jug wine gas/oil 5% glow thou airplane 1950 guy named Broadfield discovered later have big manufacturer balsa gliders ROGs during 20s appeared Long Island field field box detachable legs man didnt come down trees got off knees standup starting two U-shaped saddle pieces inserted hold model days box standing crosswind light 6-ft cabin ship top often blew over after-shock splintering noises ol boy gifted bunch us boxes cried foul bills arrived Can imagine gall Seven bucks came starters wet cells glow Continued page 122 Youli Soar Unimagined Heights Now can build paper airplanes fly high far masters Paper Airplane Book official book Second Great International Paper Airplane Contest Youll get tips winners blueprints prize winning designs instructions build own high-flying planes Learn Secrets Japanese Air Superiority reason Japanese hold paper airplane records paper use Its never available count. until now including enough sheets exclusive paper make several models own Prepared editors Science 86 Paper Airplane Book beautifully designed high-quality photography winning entries Second Great International Paper Airplane Contest Its perfect gift paper pilots ages Special Offer Science 86 Through special arrangement Random House Science 86 now accepting orders PaperAirplane Book just $895 order copies just fill coupon below mail us check money order Please send mecopies PaperAirplane Book $895 plus $175 postage handling Mail tO Science 86 Airplane Book PO Box 10982 'DesMoines Iowa 50340 Total amount order $________ D Enclosed check money order made payable Science 86 Eli Please charge my[]Visa MasterCard rn Date Siomt,rp Address City State 7in Please allow 46 weeks delivery Outside U5Aadd $250 PAB-MA486 April 1986 37 PILOTS TS RIOR TS T THE MOST SUPERIOR PILOT FIGURE ON THE MARKET LIGHTEST WEIGHT MOST REALISTIC AVAILABLE GIVE YOUR PLANE PILOT FOR YOUR NEWEST OLDEST OR NEXT CREATION R YOURS TODAY FULL FIGURES CIVILIANWWII MILITARY 1/3 Scale $19951/5 Navy $1395 1/4 Scale14951/6AAF1195 1 /5 Scale1295 Plus 1/12 Scale895$250 shipping 1/12 Chopper 895each figure KNIGHTS OF THE AIR 1400 Rte 22 West Friendship MD 21794 301-489-5050 Letters Editor Continued page 12 compiling error having gone undetected long quantity E1115/61 usually much smaller quantity L*S2/Sl As such little error pro duced used probably noticed attributed geometric variations actual model Mr Donatelli found error may have used design di mensions producing severe imbab ance So Line 760 should read PL*S2/SlE1/15/Gl apologies error must lot modelers out computers already getting mail about article Design Analysis Program Dick Sarpolus Shrewsbury NJ Safety Preston Continued page 20 stated experiencing prob lems some parts country RC cars buggies using frequencies reserved aircraft. Perhaps Davids label suggestion can help alleviate some problems FlutterAnother item mentioned last months Safety column suggestion modeler should man datory checks models prevent con trol surface flutter November 1985 issue Corsair newsletter Joint Military R/G Fliers Club editor Marlin Kinning article flutter written noted modeler Cliff Weirick benefit readers may know what flutter can model Im reproducing Cliffs article FLUTTER Most know what seem some fliers dontor dont care break flutter down two levels full blown FLUTTER very destructive force second BUZZ Buzz too very destructive force slightly dif ferent way Lets look FLUTTER first can destroy airplane quicker can blink eye can attack sur face plane its prime targets ailerons followed closely elevator rudder flutter starts matter time until surface itself leaves plane takes sur face attached case two wings elevator counts up three airplanes stunt job wing failure next two Formula Ones Another aileron wing other elevator Actu ally very famousor should say infamouscrash lot oldtimers will remember Nats Los Alamitos NAS Boy what mess Now know what flutter can lets think about BUZZ hard describe because cant hear power model unless engine dead can hear flutter loud est engines whining away Buzz tends destroy servosand ultimately plane tends ruin gears worse yet attacks feedback pot ser vo does wearing small area usually around level-flight neutral position happens wonder sometimes controls may act funny What causes buzz Primarily two things Loose control surfaces sloppy tail-heavy loose sloppy pushrods etc see control surfaces look ready fall off airplane yet pilots ignore Same way pushrods Some builders drill %2-in holes control horn use 46-in wire Thats really asking sum up check things time go out fly remem ber tight will wear out get loose Have safe moath John Preston 12235 Tildenwood Dr Rockville MD 20852 responding advertisers mention read aboutthem ModelAviation drivers fuel pumps rolled aisles over power panels gallon fuel cans transmitter tray must got hand-held units Field boxes heavy wacky high-techand prop can cost seven bucks about power panel under nose run engines fancy hinged lids prevent getting anything plane figure top wedding cake ends up ground crawling aroundeasier get ting up down like jive puppet Im back knees now cant get up Legs no legs question Bill H Greenhalgh man after own heart dont have ambition brains too suffering herd guy lives place called Wetumpka Alabama must have right stuff am another old coot Au Good name next modeL built first model airplane back 1920s Bill edifies us after 30 years Air Corps/Air Force another 10 years doingthings government heart problem came back modeling After building Sig Kadet bitten RC bug since have built several airplanes mostly scratch Being too old hands knees bit fueling starting airplanes put folding legs huge field box raise level permitted work standing position course field box/stand weighed much took two us move After building some plant stands PVC plastic pipe wife realized could have light field stand could handle easily comfort several months now have using stand shown enclosed photographs Built 1-in PVC pipe consists two ends two shelves supports airplane fastened ends bolts wing nuts permitting quicikly change fit different fuselages padding fuselage supports insulation sold PVC pipes 1 22 Model Aviation Plane Talk/Winter Continued page 37 two shelves simply two straight pipes held together sheet hardboard shelves ends joined spring clips shown pictures whole thing disassembles quickly fit car trunks room spare usually leave assembled carry airplane van Once decided sizes wanted figured out parts list construction took less hour expenditure less $10 field stand doubles great work stand shop stand problem solved turned problem equipment carried old field box Using scrap plywood built three boxes fueling box carries half-gallon plastic fuel tank 12-volt battery electric fuel pump starter box includes 12-volt battery power panel storage space glow plugs small tools electric starter tool box has drawer small tools parts storage compartments spare propellers larger tools equip ment cleaning equipment other essential items seldom needed put cleats ends bottom box fit over shelves keep boxes vibrating off shelf boxes quite light easily handled two 12-volt batteries provide back up prevent loss flying session forget charge Add folding chair jug coffee iced tea depending upon tempera ture have makings com fortable enjoyable flying session know youngsters will sneer such sissy stuff thought would pass along whatever worth hope will interest some other old-timers senior citizens seem coming RC hobby simplifi cation equipment might ensure sustained interest pleasant flying field conditions Thus spake Bill Greenhalgh Wetump ka AL Favor requested Will something cause close heart February 1986 ModelAirplane News Hal deBolt began new long-needed feature Golden Age RC has making long time us have put heads together help make possible always wanted self colunm specifically RC have interest Antique OldTimer modeling SAM Society Antique Modelers makes go Thats primarily based old Free Flight models RC-assist involved interest Old-Timer Control Line models obvious potential RC its own right has neglecteduntil now know 1950s 6-ft 35powered Smog Hog example does anything can Saturday Night Specialexcept go straight up Its easier safer fly things flown now came low-wing Smog Hog Sig Mfg Co perceived Kasmirski 45-powered Orion 1960 Aero batics World Champion still matches performance modern engine anything can think hot aerobatic airplane hundreds published once-kitted wonderful air planesdeltas canards name Ob viously an Antique era OldTimer era Nostalgic erastarting things like Goods Big Guff prewar days Taurus Orion 1960 Buzzard Bombshells could promote competitions aware majority will prefer simply enjoy flying historic planes Please contribute Hals column us hundreds pictures out Send background info Harold deBolt 2206 Greenwich Dr Kings Pt Sun City Center FL 33570 Without contributions column like deBolts cannot continued indefi nitely Photographic examples particular needed Falcon OldTimer dating late SOs Beams Esquires H-Rays Berkeleys Hollinger J 3 Fairchild PT on Walt Goods series history Radio Control began last month Chet Lanzo has asked help major presentation 1934 RC-1 prehistoric radio gear People keep building Krackerjac Rookie designers have same experience Beyond historic stuff now appearing magazine no continuity except deBolts Golden Age thing requires everyone interested assure prospers pictures good information Mining gold depends have gratitude joining effort Before long youll have yourself thank having bothered Bill Winter 4432 Altura Ct Fajifax VA 22030 Radio Technique/Myers Continued page 38 buy products object will likely accompanied warning literature manufacturer will receptive constructive criticism object being sold lacks such obvious liability/litigation potential manufacturers interest usually concen trates itself price profit performed static structural load test airplanes towhook/fuselage/wing combination Jugs water provided test load pint water weighs pound Note done before wing covered wing should depend covering strength sides something cracks want see well hear wing spar strong enough Only dowel needed changed Continued page 126 April 1986 123 C C El I m z 0 z z C 0 0 m I m 0 q 0 CD C 0 0 C -4 0 CD 0 Co U 0 -L N 0 0 01 x x N
Edition: Model Aviation - 1986/04
Page Numbers: 30, 31, 32, 33, 34, 36, 37, 122, 123
Bill Winter _____T12ILX E1Z0 0 Plane Talk Left Leading off Al Backstroms tailless fantasies Hoffman Wing follow-up Arup remember Smilin Jack comic strip Hoffman chief engineer Very stable model manyflights rubber now perks CO-2 Configuration less sensitive CG shifts conventional planes Tips ailerons Winter drawing large possible RC Right all-sheet Waterman Aerobile taughtAl iittl@ because always flew well Did 4Osec indoors its third flight now worn out flying ceiling hits Al has bigger built-up glow version Winterthinks RCM published RC Full-size plane Guggenheim Safety Plane competition 30s Above Lipplach Delta precursor postwar delta fighters High aspect ratio makes model extremely hard adjust Large props OK pusher tractor version Delta II would tolerate power burstof a4-in prop Both flew notwell Buildercon alders flops Right Backatroms model own successful full-scale plank Best flier series does 60 sec Cat site Left tractor stick isa tailless version Dr Lippiachs semi-ground-effect machine has flown several times never ROW Intended Right Backatroms neat Peanut Nicuport 11 Nowlen Aero kit experimental jobs displays nifty work manship nonetheless Nieuport consistently turns pretty flights though long duration Backatrom would like 30 Model Aviation L1JiJ~ FIG NOTE Long short wing versions FIG C 11 III / I/ Final version Backstroms pusher-engined plank has 110 flIght hours Insert side view tip fin isa drag rudderwhich hinges outward Dick Johnsons engine concept 16- 20-hp twin belt-driven countershaft top-mounted prop larger side view shows reflex alrfoli pusher props thrust line I Future possIbilities could include twin having delta-shaped center section area profile sketch shows airfoils thrust lines As planned two Johnsons twin-cylinder engines would used turning singie-biaded Evereil propellers TWILIGHT ZONE Lincoln Beachey glamour pilot early century said Give barn door Twill fly Al Backstrom would horrified being compared immortal Beachey indeed quite mortalgoing out boots thrilling multitudes San Francisco Golden Gate Exposition 1915 Al designs flies full-scale planks Planks go way back notably Europe Backstroms addiction finicky birds both gliders powered has found attention home-builders long involvement fringe-stuff models similarly reflects lifetime fascination gliders tailless aircraft Whats plank As see drawings plank usually paralleledged wing tailless generally assumed have no sweep heavily reflexed airfoil makes stable Well concentrate full-scale work Backstrom friends Backstrom finds No-Cal rubber-pow ered quickies especially useful look bit rough dont fooled include Nieuport 11 Peanut show capability modeling approach no fuss no feathers modeling inspired Air Trails late 30s AT covers things like Zanonia Bowlus sailplanes fired imagination articles about Northrop wings other novelties such Waterman Arrowbile convinced him such designs would fly models During epic interruption NW II became first student proposed gliding school shootingwas overthatfallofl945but EPB-iC 1965FiG D Al Cleaves 1965 modifications Backstroms 1954 EPB-1 glider uses center fin/rudder Winter says guestimating sport model hed expect CG close 15% chord hed use 5 dihedrai three-channel version 3 ailerons used modei would probably need aft vertical area especially ailerons April 1986 31 sent Pacific 1946 drifted joining Northrops engineering school 1947 saw flights huge Northrop XB-49 jet-powered bomber flying wing 1948 Chance-Vought produced Cutlass standard Navy carrier jet fighter swept-wing tail less 1950 enrolled Aero Engineering Department Mississippi State junior senior years specialized studies tailless craft Vought worked prototype Regulus cruise-type mis sile along way acquiring share Bowlusand earning commercial glider rating last two-digit US Silver Badge Soaring Mississippi studies concluded plank config uration best try Mississippi State place days Al came under influence Gus Raspet formed lifetime associa tion avid modeler full-scale flier Dick Johnson knew Gus inquisitive genius sat him basement Long Island home cigar box small hole side Hed blow cigarette smoke box close lid gently tap far side box Lovely expanding smoke rings traveled like procession ghosts across room What doing Search blowing smoke probably Mississippi commercial aircraft makers embarrassed superb performance Wittmans Tailwind Gus obtained plane Wittman took off prop covered thing tufts show airflow towed make studies experimented blown wings kind fan wing powered separate power source believe approach power plant failed giving fatal case asym metric lift Gus fine sailplane pilot Back Vought early SOs Backstrom doodled 36-ft plank aspect ratio 9-plus profile test model flew well enough demonstrate soaring potential impressed associates said Lets build 1954 26-ft 5in EPB-1 flying 1 956the ship good enough students few solo hours fly well famous pilots like Paul MacCready Gossamer fame Dick Schreder Paul Bickle Ted Jancrarek developed aerobatic routines flew air shows plank Building powered version done Van White director Experimental Aircraft Assn Dick Johnson engine genius Plans sold least several EPB-1As showed up beginning Suffice say comprehensive article appearead Bungee Cord summer 1981 issue various powered variations theme published SportAviation February 1976 February 1980 latter included full-color center spread Having unmercifully meat-axed vast material hoped nevertheless drawings will tickle fancy inspire daring create good-flying conversa tion pieces should fun Radio Control would dare say keep under control Wing loading tease have thing about wing loadings business dividing gross weight ounces square feet area Example 72 oz divided 4 sq ft equals 18 oz per sq ft loading Since little planes flit bigger ones fly nicely assumption best wing loading across board valid increas ingly useless wide variations scale things Ive wished print pundits would plot handy way us pinpoint realistic wing loading match designs think weights Jim Walkers Sonic Control Glider held Jim appeared 1954 Air Trails Annual flight photo showed Jim biowing through big party-type horn piane guidance subject mooing cows things sharing frequency Structural shot right emphasizes loveiy iines slmpiicity Note gussets used today Giant Scaic Jim found covering loose wouldnt act like drum 32 Model Aviation ~reate own oia-timerr JCTT Mcammant Cioud Nine original CA Special Enya powered three channels 4 lb 58-in span Finish Koverall Sig dope old-style 29 square Intake cost him 810 guy didnt like Jeff does snaps fun stuff under SOft Features lifting tail big ventral fin knock-off gear downthrust rock-back dihedral centerline front dowel stringered top oh big windows Finding field boxes heavy enough get banned some hIgnwa uruunnuiun devised stand lightweight 1-in PVC pipe Disassembles quit V Ig Tint car trunks its often transported plane place van Various easy-to-carry support boxes used required round out setup Plc right shows spring clips holding sembly together Plane left plc may Big Bird featured RCM some years back sizes suspect missing link ABC stuff aerodynamicist Two readers make interesting remarks pique hackers curiosity Like great majority cant bothered would know digest available material fiddle pocket calcu lator Thats reason think ing nice would someone caine up useful curves could pinned shop wall Roy Strader teethed ROGs 1929 Now Rubber Scale Old-Timers Antiques offers .. just rambling resume some items have thinking about discussing About some differences per formance size reduced increased think forget wing craft three-dimensional item wing dimensions doubled volume increased eight-fold makes quite difference volume air wing displaces course reducing wing dimensions has same effect other direction foregoing does explain what happens wing dimensions changed dont know details changes least before changes made OK think two-dimensional good enough everyday flying threedimensional Cube square exact Does Roy mean aspect ratio changing wing dimensions goes item called span loading Au referred span loading too pounds sup ported perfoot span ounces per inch foot fyou fiddle tiny models craft some designers seem ignore both design models fullscale aircraft Piper started trend Pacer its low aspect-ratio wing suppose interests cost andweight Some EAAers go same route designs seem surprised performance increase add couple feet wings span Well course EAAers add span increase aspect ratio wing area thereby also reduce wing loading Roys point aspect ratio know dont want high-drag 5-to-i wing championship Sailplane Piper may have other thoughts well Pacer older Pipers prior chubby Vagabond followed Pacer TnPacer long-winged Piper arrived cleaned-up Super Cruiser cowled Cubs became necessary truly slow up approach holding nose highfuse lage parallel horizonto increase sink rate could overshoot pretty long runway ground effect Flaps appeared later Super Cruisers Pacer landed like real airplane say settled solidly did float like J-3s T-Crafts bumpy days highaspect jobs gave rough ride whereas low-aspect Pacer TnPacer et al smoothed things out comparison higher span loading loose similarity model ing would Monarch Kadet Strader has valid points Now meet Jeff McCammant editor Marshailtown RCers Flyer extro verted ancient born dissenter comes like Midwestern tornado RC four years has several thousand words wild fun stuff first nocent paragraph has compass spinning like Cox 010which say about 30000 rpm Wing loadings wing loadings gins scaling up down Well happened upon enlightening article Ron St Jean says incorrectly considering relationship scale up down air holds wing aloft scale-up square Two dimensional Yet atmosphere three-dimensional cube Basically St Jean says consider wing loading consider loading per cubic inch volume wing occupies send copy Judge yourself think awe-inspiring especially look charts speak truth article St Jean blank now although editor appeared August 1959 MAN Free Flighters know St Jean famous Ramrod FF also MAN Ron cool cat just lately developed Nordics latemodel FFs using simple composites frameless flying surfaces light strong Rons Wing Loading Three-Dimen sional article major feature graphs demonstrate dramatically precision three-dimensional wing loading applies sizes weights models two four charts will see some pundit did provide 1959 curve always wanted Perhaps can ask MAN make Xerox copies pages 22 23 41 44 two additional pages back book material page numbers appear McCammants copies urge MANs editor republish sig nificant report subject universal important RC ironic twist wondered about charting wing loading curve values increasing scale Continued page 34 tables two four appeared August1959 issue ModeIAiiplane News article Ron St Jean entitled Wing Load ing Three Dimensional Ramrod Free Flight model numbers indicate wing areas sizes having similar glides Fig 1 shows great variations loading according traditional two-dimensional calculations Fig 2 shows almost identical loadings figured three dimensionally Winterfeels material significant designers including RC foraccurate relationships scaling up down April 1986 33 Like CAP 21 lathe stab prove validity flying wings Bill Evans uses elevons rudder control full aerobatics pattern 72-In bird 05 61 Capacitive Discharge Ignition CH Electronics Breakerless CD Ignition System can installed engine 15 large chainsaw type new 90 15 twa four stroke engines perfect far converting CH Ignition system new kits plans airplanes just becoming available perfect size engine Four stroke engines beautiful ign Detonation death four stroke enginewhen control engine timing can stop detonation makes engine run much cooler & develops power-plus no kickback 8 very low idle CH system used engine expertsMaynard Hill George Aidridge Doran Hiatt Cliff Bennett Otto Bernhart Maynard Hill used CH system last two world records Available two four stroke engines single twin cylinder Throttle Coupled Spark Advance kits available far popular engines Custom engine set-up available Call write price quote Now fETC electronic timing control information brochure price list send $1 00 CH Electronics Inc MODEL MOTOR MUGTM high quality totally glazed ceramic engine mug must modeler Standing 51/ inches tall large 10 oz capacity its real attention getter definite collectors piece years come OnlyPlus $200 postage $695and handling per order CA residents add sales tax Box 1732 Riverton WY 82501 Phone 307-8576897 REPLACEMENT PARTS FOR Kraft Engines Thator/ McCoy TaIpan 40 RJL ENGINES Call Only Factory Source RJL INDUSTRIES Free Parts Catalog Available increased looking right-hand column Fig 2 wing loading terms oz/cu ft value increases note cube square appear fall straight line curve think will quit am still behind Said St Jean mewhat surprised find recent years As could did glide well C jobs come wondered What happened Reynolds Number repealed small engines become much hotter size larger engines did fact old wing loading rule abolished have something check out latter possibility Ron continued computed wing loadings Ramrod fleet coming up information Fig 1 As can seen tables very definite progression evident small models having much lower wing loading large ones yet glides sinking speeds dif ferent-sized Ramrods pretty much same felt found answer certainly didnt understand until day hit us like bolt years have thinking wing loading terms much per square something other wing two-dimensional thing threedimensional loading should figured volume area basis has chord span thickness well test hypothesis quickly checked out calculating wing loading much per cubic inch rather square inch make measure wing volume first determined actual rib area typical Ramrod wing section divided chord area value order arrive measure average thickness Multiplying average thickness particular wing its area would produce volume cubic inches As shown table dividing weight ounces figure gives us threedimensional cubic wing loading ounces per cubic inch various-sized Ramrods Fig 2 As can seen table cubic wing loading almost identical through various sizes since models have addition equivalent gliding ability statement principle seems order scaling design different size retain same glide wing volume should made directly proportional weight Au Italics since dealing same design can make weight propor tional cube span 3/2 power area square root area cubed results same important thing being put measure wing three-dimensional terms now apparent us figuring wing loading ounces per square foot square inch useful measure Continued page 36 34 Model Aviation r RIL Industries ox 5654 dena CA 91107 Phone 818 359-0016 iLJL1 L LLL 13311 Beach Ave na Del Rey CA 1J 1-624 0@00000so@oso@o@o@o@o@o@O L VIDEO 0 HOBBY RETAILERSS Answer YesI 0 4 ESPONSE YOUR OVERWELMING0 DEMANDS WE NOW HAVE SOLID DEALERQ PLAN EXCLUSIVELY FOR YOUI YOU CAN NOW RENT OR 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Saves Models BATT-CHEK RX-1 $1495 n USA NEW Install RC Models Check receiver battery status press button Small Light 1/2 oz Precise Rugged ORDER TODAY dealer Protune Corp 1914 462-6452 PO Box 1808 Poughkeepsie NY 12601 TARBaby Especially Turn-around 850 sq 120 4 cycle powered Ron Chidgey design smooth solid performer Rib templates computer plotted Plans construc tion hints- $1195 TRANSMITTER CASE An inespensive rugged molded case protect expensive transmitter both two stick single stick transmitters Brown leather grain aluminum trim locking clasp $1895 WING TUBE & SOCKETSNEW WING MOUNTING SET Aluminum alloy tubing plug-inA wing mounting system developed Ron Chidgey wings Included pair ofthat fast neat accurate stays tight Three special slip fit phenolic socketsnylon brackets screws machined wing blocks build wing structureincluded -$695 Now size models 718 dia s 2 $ 8g5 1 dies 2$ gg 1 dia x3 -$1495 P Gator RIO Products 3713 Pompano Dr See Dealer Order Direct Pensacola FL 32514for UPS Phone AC 904 476-8639Include $150 Per Item TORK-STARTER revolutionary concept power iSV glow plugs model cars boats air plenes using glow fuel engines TORK-STARTERITMI has steel wrench strong W enough reduce compression easier starting supplies power doing comes new CuD charger has LED indicate nhe unit charging also has removable T handle can used Torque amplIfier Over 50 consecutive starts full charge rechargeable hundreds times Clips onto plug positive connection Send ad along prepayment receive MFG OF NI-STARTER free shipping handling TORK-STARTER T$2995 Charger NOV 22tV 12V Fast Chartvrl $2995 $2095 Without Charger Charger CHARGERS PLEASE SPECIFY WHICH CHARGER 95 Charger Only WHEN ORDERINGII tOy 220V 12V Fast Chargtrl 12421 Ransom Dr. Glenn Dale MD 20769301 464-2260 comparison between models almost same sizes con sidered real fallacy making wing loading comparisons area basis co-mingling oranges apples speak weight three-dimensional area two-dimensional direct comparison need express terms other will same dimension whether two three Poor Jeff McCanimant writes wonderful letter talk about St Jean Third Dimension Saying modeler since day born beats proud designing own stuff ant-eating own parts building flying alone really blooming extrovert Heres what said about training Being. way am rejected normal way learning fly RC popular way accepted around 40-powered four-channel trainer first differently wanted Sailplane Jeff declares So got Sig Riser Rider put power pod Thats revolutionary No other way fly start engine radio toss climb play land feet again Theres no running get 900-ft highstart line no tow hooks etc taught myself fly Never instructor Now three years later club has people fly Gliders power pods started almost nobody thought flying Gliders Glider gives plenty reaction time Jeff makes sense too am block headed Listen up quiet airstrip Doug Pratt flying simultane ously now Kracketjac new Rookie pennants drooped tennas soft Bahamian air two Enya four-strokes purred quietly impacting dream-world environment yellow low-winger red cabin ship against deep blue sky eight minutes both planes trimmed hands off switched transmitters What rare experience fly two own planes flight different As sun sank beginner never taken off landed himseW appeared RCM 40 knocking knees Doug took oft flew superbly low-key support talk reassuring him fast nicely-banked approaches did flawlessly mentioned flown Gentle Lady didnt count leftright days behind him Thats giant first step Doug said after learned fly MRC Chipmunk Doug years ago snap rolling second flight too flown Gentle Lady same quirk young beginner friends didnt count What Ive talked truly hot-start beginners given truth serum confess good times Gentle Lady others like find myself perplexed strangers ask about getting started usually no help want anything better knowing resistance real primary trainers some stigma cross mental fingers suggest Gentle Lady does have say something power training such models climb slowly mope along good podmounted 049 myself Id put engine nose Its good plane beginning Electrics too Start popular 05 electric motors six 12 Ah Sanyo cells later may want try SR batteries other props cells folders cobalt motors reduction drives etc keep start simple going swallow tub-thumping jargon argot insist fast 40powered animal four channels little forgiveness thats fine sellers accessories include certified instructor great communicator under stands children work living youll have wait instructor busy Sunday good guys similarly desperate fly youll wallflower fruitless Sundays ticking away like taxi meterif active site busy club However learn solo yourself path easier have flown form model past wont let fly site until youve demonstrated proper solo flight Few instructors able willing give feel flight itself understand inner nature little beasts begin Glider select kit shows rigging power pod Thrust lines important example nose-mounted glow engine electric mo tor will require downthrust model will stall easily under power spells sloppy flight floundering con trol under power airspeed higher design speed Glider producing excess lift downthrust counteracts excess lift nose-mounted power source will need least 20 down maybe 40 50 pod engine motor high above both center gravity center drag has effect similar downthrust may enough paraphrase Will Rogers said never met man didnt like never met field box 1 did like Life simple doorbell battery Pandoras shoebox jug wine gas/oil 5% glow thou airplane 1950 guy named Broadfield discovered later have big manufacturer balsa gliders ROGs during 20s appeared Long Island field field box detachable legs man didnt come down trees got off knees standup starting two U-shaped saddle pieces inserted hold model days box standing crosswind light 6-ft cabin ship top often blew over after-shock splintering noises ol boy gifted bunch us boxes cried foul bills arrived Can imagine gall Seven bucks came starters wet cells glow Continued page 122 Youli Soar Unimagined Heights Now can build paper airplanes fly high far masters Paper Airplane Book official book Second Great International Paper Airplane Contest Youll get tips winners blueprints prize winning designs instructions build own high-flying planes Learn Secrets Japanese Air Superiority reason Japanese hold paper airplane records paper use Its never available count. until now including enough sheets exclusive paper make several models own Prepared editors Science 86 Paper Airplane Book beautifully designed high-quality photography winning entries Second Great International Paper Airplane Contest Its perfect gift paper pilots ages Special Offer Science 86 Through special arrangement Random House Science 86 now accepting orders PaperAirplane Book just $895 order copies just fill coupon below mail us check money order Please send mecopies PaperAirplane Book $895 plus $175 postage handling Mail tO Science 86 Airplane Book PO Box 10982 'DesMoines Iowa 50340 Total amount order $________ D Enclosed check money order made payable Science 86 Eli Please charge my[]Visa MasterCard rn Date Siomt,rp Address City State 7in Please allow 46 weeks delivery Outside U5Aadd $250 PAB-MA486 April 1986 37 PILOTS TS RIOR TS T THE MOST SUPERIOR PILOT FIGURE ON THE MARKET LIGHTEST WEIGHT MOST REALISTIC AVAILABLE GIVE YOUR PLANE PILOT FOR YOUR NEWEST OLDEST OR NEXT CREATION R YOURS TODAY FULL FIGURES CIVILIANWWII MILITARY 1/3 Scale $19951/5 Navy $1395 1/4 Scale14951/6AAF1195 1 /5 Scale1295 Plus 1/12 Scale895$250 shipping 1/12 Chopper 895each figure KNIGHTS OF THE AIR 1400 Rte 22 West Friendship MD 21794 301-489-5050 Letters Editor Continued page 12 compiling error having gone undetected long quantity E1115/61 usually much smaller quantity L*S2/Sl As such little error pro duced used probably noticed attributed geometric variations actual model Mr Donatelli found error may have used design di mensions producing severe imbab ance So Line 760 should read PL*S2/SlE1/15/Gl apologies error must lot modelers out computers already getting mail about article Design Analysis Program Dick Sarpolus Shrewsbury NJ Safety Preston Continued page 20 stated experiencing prob lems some parts country RC cars buggies using frequencies reserved aircraft. Perhaps Davids label suggestion can help alleviate some problems FlutterAnother item mentioned last months Safety column suggestion modeler should man datory checks models prevent con trol surface flutter November 1985 issue Corsair newsletter Joint Military R/G Fliers Club editor Marlin Kinning article flutter written noted modeler Cliff Weirick benefit readers may know what flutter can model Im reproducing Cliffs article FLUTTER Most know what seem some fliers dontor dont care break flutter down two levels full blown FLUTTER very destructive force second BUZZ Buzz too very destructive force slightly dif ferent way Lets look FLUTTER first can destroy airplane quicker can blink eye can attack sur face plane its prime targets ailerons followed closely elevator rudder flutter starts matter time until surface itself leaves plane takes sur face attached case two wings elevator counts up three airplanes stunt job wing failure next two Formula Ones Another aileron wing other elevator Actu ally very famousor should say infamouscrash lot oldtimers will remember Nats Los Alamitos NAS Boy what mess Now know what flutter can lets think about BUZZ hard describe because cant hear power model unless engine dead can hear flutter loud est engines whining away Buzz tends destroy servosand ultimately plane tends ruin gears worse yet attacks feedback pot ser vo does wearing small area usually around level-flight neutral position happens wonder sometimes controls may act funny What causes buzz Primarily two things Loose control surfaces sloppy tail-heavy loose sloppy pushrods etc see control surfaces look ready fall off airplane yet pilots ignore Same way pushrods Some builders drill %2-in holes control horn use 46-in wire Thats really asking sum up check things time go out fly remem ber tight will wear out get loose Have safe moath John Preston 12235 Tildenwood Dr Rockville MD 20852 responding advertisers mention read aboutthem ModelAviation drivers fuel pumps rolled aisles over power panels gallon fuel cans transmitter tray must got hand-held units Field boxes heavy wacky high-techand prop can cost seven bucks about power panel under nose run engines fancy hinged lids prevent getting anything plane figure top wedding cake ends up ground crawling aroundeasier get ting up down like jive puppet Im back knees now cant get up Legs no legs question Bill H Greenhalgh man after own heart dont have ambition brains too suffering herd guy lives place called Wetumpka Alabama must have right stuff am another old coot Au Good name next modeL built first model airplane back 1920s Bill edifies us after 30 years Air Corps/Air Force another 10 years doingthings government heart problem came back modeling After building Sig Kadet bitten RC bug since have built several airplanes mostly scratch Being too old hands knees bit fueling starting airplanes put folding legs huge field box raise level permitted work standing position course field box/stand weighed much took two us move After building some plant stands PVC plastic pipe wife realized could have light field stand could handle easily comfort several months now have using stand shown enclosed photographs Built 1-in PVC pipe consists two ends two shelves supports airplane fastened ends bolts wing nuts permitting quicikly change fit different fuselages padding fuselage supports insulation sold PVC pipes 1 22 Model Aviation Plane Talk/Winter Continued page 37 two shelves simply two straight pipes held together sheet hardboard shelves ends joined spring clips shown pictures whole thing disassembles quickly fit car trunks room spare usually leave assembled carry airplane van Once decided sizes wanted figured out parts list construction took less hour expenditure less $10 field stand doubles great work stand shop stand problem solved turned problem equipment carried old field box Using scrap plywood built three boxes fueling box carries half-gallon plastic fuel tank 12-volt battery electric fuel pump starter box includes 12-volt battery power panel storage space glow plugs small tools electric starter tool box has drawer small tools parts storage compartments spare propellers larger tools equip ment cleaning equipment other essential items seldom needed put cleats ends bottom box fit over shelves keep boxes vibrating off shelf boxes quite light easily handled two 12-volt batteries provide back up prevent loss flying session forget charge Add folding chair jug coffee iced tea depending upon tempera ture have makings com fortable enjoyable flying session know youngsters will sneer such sissy stuff thought would pass along whatever worth hope will interest some other old-timers senior citizens seem coming RC hobby simplifi cation equipment might ensure sustained interest pleasant flying field conditions Thus spake Bill Greenhalgh Wetump ka AL Favor requested Will something cause close heart February 1986 ModelAirplane News Hal deBolt began new long-needed feature Golden Age RC has making long time us have put heads together help make possible always wanted self colunm specifically RC have interest Antique OldTimer modeling SAM Society Antique Modelers makes go Thats primarily based old Free Flight models RC-assist involved interest Old-Timer Control Line models obvious potential RC its own right has neglecteduntil now know 1950s 6-ft 35powered Smog Hog example does anything can Saturday Night Specialexcept go straight up Its easier safer fly things flown now came low-wing Smog Hog Sig Mfg Co perceived Kasmirski 45-powered Orion 1960 Aero batics World Champion still matches performance modern engine anything can think hot aerobatic airplane hundreds published once-kitted wonderful air planesdeltas canards name Ob viously an Antique era OldTimer era Nostalgic erastarting things like Goods Big Guff prewar days Taurus Orion 1960 Buzzard Bombshells could promote competitions aware majority will prefer simply enjoy flying historic planes Please contribute Hals column us hundreds pictures out Send background info Harold deBolt 2206 Greenwich Dr Kings Pt Sun City Center FL 33570 Without contributions column like deBolts cannot continued indefi nitely Photographic examples particular needed Falcon OldTimer dating late SOs Beams Esquires H-Rays Berkeleys Hollinger J 3 Fairchild PT on Walt Goods series history Radio Control began last month Chet Lanzo has asked help major presentation 1934 RC-1 prehistoric radio gear People keep building Krackerjac Rookie designers have same experience Beyond historic stuff now appearing magazine no continuity except deBolts Golden Age thing requires everyone interested assure prospers pictures good information Mining gold depends have gratitude joining effort Before long youll have yourself thank having bothered Bill Winter 4432 Altura Ct Fajifax VA 22030 Radio Technique/Myers Continued page 38 buy products object will likely accompanied warning literature manufacturer will receptive constructive criticism object being sold lacks such obvious liability/litigation potential manufacturers interest usually concen trates itself price profit performed static structural load test airplanes towhook/fuselage/wing combination Jugs water provided test load pint water weighs pound Note done before wing covered wing should depend covering strength sides something cracks want see well hear wing spar strong enough Only dowel needed changed Continued page 126 April 1986 123 C C El I m z 0 z z C 0 0 m I m 0 q 0 CD C 0 0 C -4 0 CD 0 Co U 0 -L N 0 0 01 x x N
Edition: Model Aviation - 1986/04
Page Numbers: 30, 31, 32, 33, 34, 36, 37, 122, 123
Bill Winter _____T12ILX E1Z0 0 Plane Talk Left Leading off Al Backstroms tailless fantasies Hoffman Wing follow-up Arup remember Smilin Jack comic strip Hoffman chief engineer Very stable model manyflights rubber now perks CO-2 Configuration less sensitive CG shifts conventional planes Tips ailerons Winter drawing large possible RC Right all-sheet Waterman Aerobile taughtAl iittl@ because always flew well Did 4Osec indoors its third flight now worn out flying ceiling hits Al has bigger built-up glow version Winterthinks RCM published RC Full-size plane Guggenheim Safety Plane competition 30s Above Lipplach Delta precursor postwar delta fighters High aspect ratio makes model extremely hard adjust Large props OK pusher tractor version Delta II would tolerate power burstof a4-in prop Both flew notwell Buildercon alders flops Right Backatroms model own successful full-scale plank Best flier series does 60 sec Cat site Left tractor stick isa tailless version Dr Lippiachs semi-ground-effect machine has flown several times never ROW Intended Right Backatroms neat Peanut Nicuport 11 Nowlen Aero kit experimental jobs displays nifty work manship nonetheless Nieuport consistently turns pretty flights though long duration Backatrom would like 30 Model Aviation L1JiJ~ FIG NOTE Long short wing versions FIG C 11 III / I/ Final version Backstroms pusher-engined plank has 110 flIght hours Insert side view tip fin isa drag rudderwhich hinges outward Dick Johnsons engine concept 16- 20-hp twin belt-driven countershaft top-mounted prop larger side view shows reflex alrfoli pusher props thrust line I Future possIbilities could include twin having delta-shaped center section area profile sketch shows airfoils thrust lines As planned two Johnsons twin-cylinder engines would used turning singie-biaded Evereil propellers TWILIGHT ZONE Lincoln Beachey glamour pilot early century said Give barn door Twill fly Al Backstrom would horrified being compared immortal Beachey indeed quite mortalgoing out boots thrilling multitudes San Francisco Golden Gate Exposition 1915 Al designs flies full-scale planks Planks go way back notably Europe Backstroms addiction finicky birds both gliders powered has found attention home-builders long involvement fringe-stuff models similarly reflects lifetime fascination gliders tailless aircraft Whats plank As see drawings plank usually paralleledged wing tailless generally assumed have no sweep heavily reflexed airfoil makes stable Well concentrate full-scale work Backstrom friends Backstrom finds No-Cal rubber-pow ered quickies especially useful look bit rough dont fooled include Nieuport 11 Peanut show capability modeling approach no fuss no feathers modeling inspired Air Trails late 30s AT covers things like Zanonia Bowlus sailplanes fired imagination articles about Northrop wings other novelties such Waterman Arrowbile convinced him such designs would fly models During epic interruption NW II became first student proposed gliding school shootingwas overthatfallofl945but EPB-iC 1965FiG D Al Cleaves 1965 modifications Backstroms 1954 EPB-1 glider uses center fin/rudder Winter says guestimating sport model hed expect CG close 15% chord hed use 5 dihedrai three-channel version 3 ailerons used modei would probably need aft vertical area especially ailerons April 1986 31 sent Pacific 1946 drifted joining Northrops engineering school 1947 saw flights huge Northrop XB-49 jet-powered bomber flying wing 1948 Chance-Vought produced Cutlass standard Navy carrier jet fighter swept-wing tail less 1950 enrolled Aero Engineering Department Mississippi State junior senior years specialized studies tailless craft Vought worked prototype Regulus cruise-type mis sile along way acquiring share Bowlusand earning commercial glider rating last two-digit US Silver Badge Soaring Mississippi studies concluded plank config uration best try Mississippi State place days Al came under influence Gus Raspet formed lifetime associa tion avid modeler full-scale flier Dick Johnson knew Gus inquisitive genius sat him basement Long Island home cigar box small hole side Hed blow cigarette smoke box close lid gently tap far side box Lovely expanding smoke rings traveled like procession ghosts across room What doing Search blowing smoke probably Mississippi commercial aircraft makers embarrassed superb performance Wittmans Tailwind Gus obtained plane Wittman took off prop covered thing tufts show airflow towed make studies experimented blown wings kind fan wing powered separate power source believe approach power plant failed giving fatal case asym metric lift Gus fine sailplane pilot Back Vought early SOs Backstrom doodled 36-ft plank aspect ratio 9-plus profile test model flew well enough demonstrate soaring potential impressed associates said Lets build 1954 26-ft 5in EPB-1 flying 1 956the ship good enough students few solo hours fly well famous pilots like Paul MacCready Gossamer fame Dick Schreder Paul Bickle Ted Jancrarek developed aerobatic routines flew air shows plank Building powered version done Van White director Experimental Aircraft Assn Dick Johnson engine genius Plans sold least several EPB-1As showed up beginning Suffice say comprehensive article appearead Bungee Cord summer 1981 issue various powered variations theme published SportAviation February 1976 February 1980 latter included full-color center spread Having unmercifully meat-axed vast material hoped nevertheless drawings will tickle fancy inspire daring create good-flying conversa tion pieces should fun Radio Control would dare say keep under control Wing loading tease have thing about wing loadings business dividing gross weight ounces square feet area Example 72 oz divided 4 sq ft equals 18 oz per sq ft loading Since little planes flit bigger ones fly nicely assumption best wing loading across board valid increas ingly useless wide variations scale things Ive wished print pundits would plot handy way us pinpoint realistic wing loading match designs think weights Jim Walkers Sonic Control Glider held Jim appeared 1954 Air Trails Annual flight photo showed Jim biowing through big party-type horn piane guidance subject mooing cows things sharing frequency Structural shot right emphasizes loveiy iines slmpiicity Note gussets used today Giant Scaic Jim found covering loose wouldnt act like drum 32 Model Aviation ~reate own oia-timerr JCTT Mcammant Cioud Nine original CA Special Enya powered three channels 4 lb 58-in span Finish Koverall Sig dope old-style 29 square Intake cost him 810 guy didnt like Jeff does snaps fun stuff under SOft Features lifting tail big ventral fin knock-off gear downthrust rock-back dihedral centerline front dowel stringered top oh big windows Finding field boxes heavy enough get banned some hIgnwa uruunnuiun devised stand lightweight 1-in PVC pipe Disassembles quit V Ig Tint car trunks its often transported plane place van Various easy-to-carry support boxes used required round out setup Plc right shows spring clips holding sembly together Plane left plc may Big Bird featured RCM some years back sizes suspect missing link ABC stuff aerodynamicist Two readers make interesting remarks pique hackers curiosity Like great majority cant bothered would know digest available material fiddle pocket calcu lator Thats reason think ing nice would someone caine up useful curves could pinned shop wall Roy Strader teethed ROGs 1929 Now Rubber Scale Old-Timers Antiques offers .. just rambling resume some items have thinking about discussing About some differences per formance size reduced increased think forget wing craft three-dimensional item wing dimensions doubled volume increased eight-fold makes quite difference volume air wing displaces course reducing wing dimensions has same effect other direction foregoing does explain what happens wing dimensions changed dont know details changes least before changes made OK think two-dimensional good enough everyday flying threedimensional Cube square exact Does Roy mean aspect ratio changing wing dimensions goes item called span loading Au referred span loading too pounds sup ported perfoot span ounces per inch foot fyou fiddle tiny models craft some designers seem ignore both design models fullscale aircraft Piper started trend Pacer its low aspect-ratio wing suppose interests cost andweight Some EAAers go same route designs seem surprised performance increase add couple feet wings span Well course EAAers add span increase aspect ratio wing area thereby also reduce wing loading Roys point aspect ratio know dont want high-drag 5-to-i wing championship Sailplane Piper may have other thoughts well Pacer older Pipers prior chubby Vagabond followed Pacer TnPacer long-winged Piper arrived cleaned-up Super Cruiser cowled Cubs became necessary truly slow up approach holding nose highfuse lage parallel horizonto increase sink rate could overshoot pretty long runway ground effect Flaps appeared later Super Cruisers Pacer landed like real airplane say settled solidly did float like J-3s T-Crafts bumpy days highaspect jobs gave rough ride whereas low-aspect Pacer TnPacer et al smoothed things out comparison higher span loading loose similarity model ing would Monarch Kadet Strader has valid points Now meet Jeff McCammant editor Marshailtown RCers Flyer extro verted ancient born dissenter comes like Midwestern tornado RC four years has several thousand words wild fun stuff first nocent paragraph has compass spinning like Cox 010which say about 30000 rpm Wing loadings wing loadings gins scaling up down Well happened upon enlightening article Ron St Jean says incorrectly considering relationship scale up down air holds wing aloft scale-up square Two dimensional Yet atmosphere three-dimensional cube Basically St Jean says consider wing loading consider loading per cubic inch volume wing occupies send copy Judge yourself think awe-inspiring especially look charts speak truth article St Jean blank now although editor appeared August 1959 MAN Free Flighters know St Jean famous Ramrod FF also MAN Ron cool cat just lately developed Nordics latemodel FFs using simple composites frameless flying surfaces light strong Rons Wing Loading Three-Dimen sional article major feature graphs demonstrate dramatically precision three-dimensional wing loading applies sizes weights models two four charts will see some pundit did provide 1959 curve always wanted Perhaps can ask MAN make Xerox copies pages 22 23 41 44 two additional pages back book material page numbers appear McCammants copies urge MANs editor republish sig nificant report subject universal important RC ironic twist wondered about charting wing loading curve values increasing scale Continued page 34 tables two four appeared August1959 issue ModeIAiiplane News article Ron St Jean entitled Wing Load ing Three Dimensional Ramrod Free Flight model numbers indicate wing areas sizes having similar glides Fig 1 shows great variations loading according traditional two-dimensional calculations Fig 2 shows almost identical loadings figured three dimensionally Winterfeels material significant designers including RC foraccurate relationships scaling up down April 1986 33 Like CAP 21 lathe stab prove validity flying wings Bill Evans uses elevons rudder control full aerobatics pattern 72-In bird 05 61 Capacitive Discharge Ignition CH Electronics Breakerless CD Ignition System can installed engine 15 large chainsaw type new 90 15 twa four stroke engines perfect far converting CH Ignition system new kits plans airplanes just becoming available perfect size engine Four stroke engines beautiful ign Detonation death four stroke enginewhen control engine timing can stop detonation makes engine run much cooler & develops power-plus no kickback 8 very low idle CH system used engine expertsMaynard Hill George Aidridge Doran Hiatt Cliff Bennett Otto Bernhart Maynard Hill used CH system last two world records Available two four stroke engines single twin cylinder Throttle Coupled Spark Advance kits available far popular engines Custom engine set-up available Call write price quote Now fETC electronic timing control information brochure price list send $1 00 CH Electronics Inc MODEL MOTOR MUGTM high quality totally glazed ceramic engine mug must modeler Standing 51/ inches tall large 10 oz capacity its real attention getter definite collectors piece years come OnlyPlus $200 postage $695and handling per order CA residents add sales tax Box 1732 Riverton WY 82501 Phone 307-8576897 REPLACEMENT PARTS FOR Kraft Engines Thator/ McCoy TaIpan 40 RJL ENGINES Call Only Factory Source RJL INDUSTRIES Free Parts Catalog Available increased looking right-hand column Fig 2 wing loading terms oz/cu ft value increases note cube square appear fall straight line curve think will quit am still behind Said St Jean mewhat surprised find recent years As could did glide well C jobs come wondered What happened Reynolds Number repealed small engines become much hotter size larger engines did fact old wing loading rule abolished have something check out latter possibility Ron continued computed wing loadings Ramrod fleet coming up information Fig 1 As can seen tables very definite progression evident small models having much lower wing loading large ones yet glides sinking speeds dif ferent-sized Ramrods pretty much same felt found answer certainly didnt understand until day hit us like bolt years have thinking wing loading terms much per square something other wing two-dimensional thing threedimensional loading should figured volume area basis has chord span thickness well test hypothesis quickly checked out calculating wing loading much per cubic inch rather square inch make measure wing volume first determined actual rib area typical Ramrod wing section divided chord area value order arrive measure average thickness Multiplying average thickness particular wing its area would produce volume cubic inches As shown table dividing weight ounces figure gives us threedimensional cubic wing loading ounces per cubic inch various-sized Ramrods Fig 2 As can seen table cubic wing loading almost identical through various sizes since models have addition equivalent gliding ability statement principle seems order scaling design different size retain same glide wing volume should made directly proportional weight Au Italics since dealing same design can make weight propor tional cube span 3/2 power area square root area cubed results same important thing being put measure wing three-dimensional terms now apparent us figuring wing loading ounces per square foot square inch useful measure Continued page 36 34 Model Aviation r RIL Industries ox 5654 dena CA 91107 Phone 818 359-0016 iLJL1 L LLL 13311 Beach Ave na Del Rey CA 1J 1-624 0@00000so@oso@o@o@o@o@o@O L VIDEO 0 HOBBY RETAILERSS Answer YesI 0 4 ESPONSE YOUR OVERWELMING0 DEMANDS WE NOW HAVE SOLID DEALERQ PLAN EXCLUSIVELY FOR YOUI YOU CAN NOW RENT OR SELL OUR VIDEO PROGRAMS FOR UNLIMITED PROFITS HERE IS INVESTMENT THAT PAYS FOR ITSELF WHILE PAYING YOUR CASH PROFITS AMONG OTHERS Q WHAT ELSE DO YOU HAVE IN YOUR STORE THAT DOES THIS WITH OUR EXTREMELY POPULAR LANE FUNNIES IN YOUR VIDEO UNEUP ADDITIONAL PROFITS CAN BE IN YOUR CASH W DRAWER AS SOON AS NEXT WEEK IF YOU ACT NOWI LETS FACE IT THE BOlTOM LINE IS Q MAKING MONEYI COMPLETE PLAN DETAILS AND SPECIAL LOW INTRODUCTORY PRICE ARE READY TO BE SENT JUST MAIL OR PHONE IN YOUR INOUIRY NOWI Send Inquiries W ACADEMY OF AVIATION RESEARCH & DEVELOPMENT PO Box 277 Hazel Crest IL 60429-0277 13121 335-O7 0@@ 00 ATT-CHEKi ON-Board Battery Tester Saves Time. Saves Models BATT-CHEK RX-1 $1495 n USA NEW Install RC Models Check receiver battery status press button Small Light 1/2 oz Precise Rugged ORDER TODAY dealer Protune Corp 1914 462-6452 PO Box 1808 Poughkeepsie NY 12601 TARBaby Especially Turn-around 850 sq 120 4 cycle powered Ron Chidgey design smooth solid performer Rib templates computer plotted Plans construc tion hints- $1195 TRANSMITTER CASE An inespensive rugged molded case protect expensive transmitter both two stick single stick transmitters Brown leather grain aluminum trim locking clasp $1895 WING TUBE & SOCKETSNEW WING MOUNTING SET Aluminum alloy tubing plug-inA wing mounting system developed Ron Chidgey wings Included pair ofthat fast neat accurate stays tight Three special slip fit phenolic socketsnylon brackets screws machined wing blocks build wing structureincluded -$695 Now size models 718 dia s 2 $ 8g5 1 dies 2$ gg 1 dia x3 -$1495 P Gator RIO Products 3713 Pompano Dr See Dealer Order Direct Pensacola FL 32514for UPS Phone AC 904 476-8639Include $150 Per Item TORK-STARTER revolutionary concept power iSV glow plugs model cars boats air plenes using glow fuel engines TORK-STARTERITMI has steel wrench strong W enough reduce compression easier starting supplies power doing comes new CuD charger has LED indicate nhe unit charging also has removable T handle can used Torque amplIfier Over 50 consecutive starts full charge rechargeable hundreds times Clips onto plug positive connection Send ad along prepayment receive MFG OF NI-STARTER free shipping handling TORK-STARTER T$2995 Charger NOV 22tV 12V Fast Chartvrl $2995 $2095 Without Charger Charger CHARGERS PLEASE SPECIFY WHICH CHARGER 95 Charger Only WHEN ORDERINGII tOy 220V 12V Fast Chargtrl 12421 Ransom Dr. Glenn Dale MD 20769301 464-2260 comparison between models almost same sizes con sidered real fallacy making wing loading comparisons area basis co-mingling oranges apples speak weight three-dimensional area two-dimensional direct comparison need express terms other will same dimension whether two three Poor Jeff McCanimant writes wonderful letter talk about St Jean Third Dimension Saying modeler since day born beats proud designing own stuff ant-eating own parts building flying alone really blooming extrovert Heres what said about training Being. way am rejected normal way learning fly RC popular way accepted around 40-powered four-channel trainer first differently wanted Sailplane Jeff declares So got Sig Riser Rider put power pod Thats revolutionary No other way fly start engine radio toss climb play land feet again Theres no running get 900-ft highstart line no tow hooks etc taught myself fly Never instructor Now three years later club has people fly Gliders power pods started almost nobody thought flying Gliders Glider gives plenty reaction time Jeff makes sense too am block headed Listen up quiet airstrip Doug Pratt flying simultane ously now Kracketjac new Rookie pennants drooped tennas soft Bahamian air two Enya four-strokes purred quietly impacting dream-world environment yellow low-winger red cabin ship against deep blue sky eight minutes both planes trimmed hands off switched transmitters What rare experience fly two own planes flight different As sun sank beginner never taken off landed himseW appeared RCM 40 knocking knees Doug took oft flew superbly low-key support talk reassuring him fast nicely-banked approaches did flawlessly mentioned flown Gentle Lady didnt count leftright days behind him Thats giant first step Doug said after learned fly MRC Chipmunk Doug years ago snap rolling second flight too flown Gentle Lady same quirk young beginner friends didnt count What Ive talked truly hot-start beginners given truth serum confess good times Gentle Lady others like find myself perplexed strangers ask about getting started usually no help want anything better knowing resistance real primary trainers some stigma cross mental fingers suggest Gentle Lady does have say something power training such models climb slowly mope along good podmounted 049 myself Id put engine nose Its good plane beginning Electrics too Start popular 05 electric motors six 12 Ah Sanyo cells later may want try SR batteries other props cells folders cobalt motors reduction drives etc keep start simple going swallow tub-thumping jargon argot insist fast 40powered animal four channels little forgiveness thats fine sellers accessories include certified instructor great communicator under stands children work living youll have wait instructor busy Sunday good guys similarly desperate fly youll wallflower fruitless Sundays ticking away like taxi meterif active site busy club However learn solo yourself path easier have flown form model past wont let fly site until youve demonstrated proper solo flight Few instructors able willing give feel flight itself understand inner nature little beasts begin Glider select kit shows rigging power pod Thrust lines important example nose-mounted glow engine electric mo tor will require downthrust model will stall easily under power spells sloppy flight floundering con trol under power airspeed higher design speed Glider producing excess lift downthrust counteracts excess lift nose-mounted power source will need least 20 down maybe 40 50 pod engine motor high above both center gravity center drag has effect similar downthrust may enough paraphrase Will Rogers said never met man didnt like never met field box 1 did like Life simple doorbell battery Pandoras shoebox jug wine gas/oil 5% glow thou airplane 1950 guy named Broadfield discovered later have big manufacturer balsa gliders ROGs during 20s appeared Long Island field field box detachable legs man didnt come down trees got off knees standup starting two U-shaped saddle pieces inserted hold model days box standing crosswind light 6-ft cabin ship top often blew over after-shock splintering noises ol boy gifted bunch us boxes cried foul bills arrived Can imagine gall Seven bucks came starters wet cells glow Continued page 122 Youli Soar Unimagined Heights Now can build paper airplanes fly high far masters Paper Airplane Book official book Second Great International Paper Airplane Contest Youll get tips winners blueprints prize winning designs instructions build own high-flying planes Learn Secrets Japanese Air Superiority reason Japanese hold paper airplane records paper use Its never available count. until now including enough sheets exclusive paper make several models own Prepared editors Science 86 Paper Airplane Book beautifully designed high-quality photography winning entries Second Great International Paper Airplane Contest Its perfect gift paper pilots ages Special Offer Science 86 Through special arrangement Random House Science 86 now accepting orders PaperAirplane Book just $895 order copies just fill coupon below mail us check money order Please send mecopies PaperAirplane Book $895 plus $175 postage handling Mail tO Science 86 Airplane Book PO Box 10982 'DesMoines Iowa 50340 Total amount order $________ D Enclosed check money order made payable Science 86 Eli Please charge my[]Visa MasterCard rn Date Siomt,rp Address City State 7in Please allow 46 weeks delivery Outside U5Aadd $250 PAB-MA486 April 1986 37 PILOTS TS RIOR TS T THE MOST SUPERIOR PILOT FIGURE ON THE MARKET LIGHTEST WEIGHT MOST REALISTIC AVAILABLE GIVE YOUR PLANE PILOT FOR YOUR NEWEST OLDEST OR NEXT CREATION R YOURS TODAY FULL FIGURES CIVILIANWWII MILITARY 1/3 Scale $19951/5 Navy $1395 1/4 Scale14951/6AAF1195 1 /5 Scale1295 Plus 1/12 Scale895$250 shipping 1/12 Chopper 895each figure KNIGHTS OF THE AIR 1400 Rte 22 West Friendship MD 21794 301-489-5050 Letters Editor Continued page 12 compiling error having gone undetected long quantity E1115/61 usually much smaller quantity L*S2/Sl As such little error pro duced used probably noticed attributed geometric variations actual model Mr Donatelli found error may have used design di mensions producing severe imbab ance So Line 760 should read PL*S2/SlE1/15/Gl apologies error must lot modelers out computers already getting mail about article Design Analysis Program Dick Sarpolus Shrewsbury NJ Safety Preston Continued page 20 stated experiencing prob lems some parts country RC cars buggies using frequencies reserved aircraft. Perhaps Davids label suggestion can help alleviate some problems FlutterAnother item mentioned last months Safety column suggestion modeler should man datory checks models prevent con trol surface flutter November 1985 issue Corsair newsletter Joint Military R/G Fliers Club editor Marlin Kinning article flutter written noted modeler Cliff Weirick benefit readers may know what flutter can model Im reproducing Cliffs article FLUTTER Most know what seem some fliers dontor dont care break flutter down two levels full blown FLUTTER very destructive force second BUZZ Buzz too very destructive force slightly dif ferent way Lets look FLUTTER first can destroy airplane quicker can blink eye can attack sur face plane its prime targets ailerons followed closely elevator rudder flutter starts matter time until surface itself leaves plane takes sur face attached case two wings elevator counts up three airplanes stunt job wing failure next two Formula Ones Another aileron wing other elevator Actu ally very famousor should say infamouscrash lot oldtimers will remember Nats Los Alamitos NAS Boy what mess Now know what flutter can lets think about BUZZ hard describe because cant hear power model unless engine dead can hear flutter loud est engines whining away Buzz tends destroy servosand ultimately plane tends ruin gears worse yet attacks feedback pot ser vo does wearing small area usually around level-flight neutral position happens wonder sometimes controls may act funny What causes buzz Primarily two things Loose control surfaces sloppy tail-heavy loose sloppy pushrods etc see control surfaces look ready fall off airplane yet pilots ignore Same way pushrods Some builders drill %2-in holes control horn use 46-in wire Thats really asking sum up check things time go out fly remem ber tight will wear out get loose Have safe moath John Preston 12235 Tildenwood Dr Rockville MD 20852 responding advertisers mention read aboutthem ModelAviation drivers fuel pumps rolled aisles over power panels gallon fuel cans transmitter tray must got hand-held units Field boxes heavy wacky high-techand prop can cost seven bucks about power panel under nose run engines fancy hinged lids prevent getting anything plane figure top wedding cake ends up ground crawling aroundeasier get ting up down like jive puppet Im back knees now cant get up Legs no legs question Bill H Greenhalgh man after own heart dont have ambition brains too suffering herd guy lives place called Wetumpka Alabama must have right stuff am another old coot Au Good name next modeL built first model airplane back 1920s Bill edifies us after 30 years Air Corps/Air Force another 10 years doingthings government heart problem came back modeling After building Sig Kadet bitten RC bug since have built several airplanes mostly scratch Being too old hands knees bit fueling starting airplanes put folding legs huge field box raise level permitted work standing position course field box/stand weighed much took two us move After building some plant stands PVC plastic pipe wife realized could have light field stand could handle easily comfort several months now have using stand shown enclosed photographs Built 1-in PVC pipe consists two ends two shelves supports airplane fastened ends bolts wing nuts permitting quicikly change fit different fuselages padding fuselage supports insulation sold PVC pipes 1 22 Model Aviation Plane Talk/Winter Continued page 37 two shelves simply two straight pipes held together sheet hardboard shelves ends joined spring clips shown pictures whole thing disassembles quickly fit car trunks room spare usually leave assembled carry airplane van Once decided sizes wanted figured out parts list construction took less hour expenditure less $10 field stand doubles great work stand shop stand problem solved turned problem equipment carried old field box Using scrap plywood built three boxes fueling box carries half-gallon plastic fuel tank 12-volt battery electric fuel pump starter box includes 12-volt battery power panel storage space glow plugs small tools electric starter tool box has drawer small tools parts storage compartments spare propellers larger tools equip ment cleaning equipment other essential items seldom needed put cleats ends bottom box fit over shelves keep boxes vibrating off shelf boxes quite light easily handled two 12-volt batteries provide back up prevent loss flying session forget charge Add folding chair jug coffee iced tea depending upon tempera ture have makings com fortable enjoyable flying session know youngsters will sneer such sissy stuff thought would pass along whatever worth hope will interest some other old-timers senior citizens seem coming RC hobby simplifi cation equipment might ensure sustained interest pleasant flying field conditions Thus spake Bill Greenhalgh Wetump ka AL Favor requested Will something cause close heart February 1986 ModelAirplane News Hal deBolt began new long-needed feature Golden Age RC has making long time us have put heads together help make possible always wanted self colunm specifically RC have interest Antique OldTimer modeling SAM Society Antique Modelers makes go Thats primarily based old Free Flight models RC-assist involved interest Old-Timer Control Line models obvious potential RC its own right has neglecteduntil now know 1950s 6-ft 35powered Smog Hog example does anything can Saturday Night Specialexcept go straight up Its easier safer fly things flown now came low-wing Smog Hog Sig Mfg Co perceived Kasmirski 45-powered Orion 1960 Aero batics World Champion still matches performance modern engine anything can think hot aerobatic airplane hundreds published once-kitted wonderful air planesdeltas canards name Ob viously an Antique era OldTimer era Nostalgic erastarting things like Goods Big Guff prewar days Taurus Orion 1960 Buzzard Bombshells could promote competitions aware majority will prefer simply enjoy flying historic planes Please contribute Hals column us hundreds pictures out Send background info Harold deBolt 2206 Greenwich Dr Kings Pt Sun City Center FL 33570 Without contributions column like deBolts cannot continued indefi nitely Photographic examples particular needed Falcon OldTimer dating late SOs Beams Esquires H-Rays Berkeleys Hollinger J 3 Fairchild PT on Walt Goods series history Radio Control began last month Chet Lanzo has asked help major presentation 1934 RC-1 prehistoric radio gear People keep building Krackerjac Rookie designers have same experience Beyond historic stuff now appearing magazine no continuity except deBolts Golden Age thing requires everyone interested assure prospers pictures good information Mining gold depends have gratitude joining effort Before long youll have yourself thank having bothered Bill Winter 4432 Altura Ct Fajifax VA 22030 Radio Technique/Myers Continued page 38 buy products object will likely accompanied warning literature manufacturer will receptive constructive criticism object being sold lacks such obvious liability/litigation potential manufacturers interest usually concen trates itself price profit performed static structural load test airplanes towhook/fuselage/wing combination Jugs water provided test load pint water weighs pound Note done before wing covered wing should depend covering strength sides something cracks want see well hear wing spar strong enough Only dowel needed changed Continued page 126 April 1986 123 C C El I m z 0 z z C 0 0 m I m 0 q 0 CD C 0 0 C -4 0 CD 0 Co U 0 -L N 0 0 01 x x N
Edition: Model Aviation - 1986/04
Page Numbers: 30, 31, 32, 33, 34, 36, 37, 122, 123
Bill Winter _____T12ILX E1Z0 0 Plane Talk Left Leading off Al Backstroms tailless fantasies Hoffman Wing follow-up Arup remember Smilin Jack comic strip Hoffman chief engineer Very stable model manyflights rubber now perks CO-2 Configuration less sensitive CG shifts conventional planes Tips ailerons Winter drawing large possible RC Right all-sheet Waterman Aerobile taughtAl iittl@ because always flew well Did 4Osec indoors its third flight now worn out flying ceiling hits Al has bigger built-up glow version Winterthinks RCM published RC Full-size plane Guggenheim Safety Plane competition 30s Above Lipplach Delta precursor postwar delta fighters High aspect ratio makes model extremely hard adjust Large props OK pusher tractor version Delta II would tolerate power burstof a4-in prop Both flew notwell Buildercon alders flops Right Backatroms model own successful full-scale plank Best flier series does 60 sec Cat site Left tractor stick isa tailless version Dr Lippiachs semi-ground-effect machine has flown several times never ROW Intended Right Backatroms neat Peanut Nicuport 11 Nowlen Aero kit experimental jobs displays nifty work manship nonetheless Nieuport consistently turns pretty flights though long duration Backatrom would like 30 Model Aviation L1JiJ~ FIG NOTE Long short wing versions FIG C 11 III / I/ Final version Backstroms pusher-engined plank has 110 flIght hours Insert side view tip fin isa drag rudderwhich hinges outward Dick Johnsons engine concept 16- 20-hp twin belt-driven countershaft top-mounted prop larger side view shows reflex alrfoli pusher props thrust line I Future possIbilities could include twin having delta-shaped center section area profile sketch shows airfoils thrust lines As planned two Johnsons twin-cylinder engines would used turning singie-biaded Evereil propellers TWILIGHT ZONE Lincoln Beachey glamour pilot early century said Give barn door Twill fly Al Backstrom would horrified being compared immortal Beachey indeed quite mortalgoing out boots thrilling multitudes San Francisco Golden Gate Exposition 1915 Al designs flies full-scale planks Planks go way back notably Europe Backstroms addiction finicky birds both gliders powered has found attention home-builders long involvement fringe-stuff models similarly reflects lifetime fascination gliders tailless aircraft Whats plank As see drawings plank usually paralleledged wing tailless generally assumed have no sweep heavily reflexed airfoil makes stable Well concentrate full-scale work Backstrom friends Backstrom finds No-Cal rubber-pow ered quickies especially useful look bit rough dont fooled include Nieuport 11 Peanut show capability modeling approach no fuss no feathers modeling inspired Air Trails late 30s AT covers things like Zanonia Bowlus sailplanes fired imagination articles about Northrop wings other novelties such Waterman Arrowbile convinced him such designs would fly models During epic interruption NW II became first student proposed gliding school shootingwas overthatfallofl945but EPB-iC 1965FiG D Al Cleaves 1965 modifications Backstroms 1954 EPB-1 glider uses center fin/rudder Winter says guestimating sport model hed expect CG close 15% chord hed use 5 dihedrai three-channel version 3 ailerons used modei would probably need aft vertical area especially ailerons April 1986 31 sent Pacific 1946 drifted joining Northrops engineering school 1947 saw flights huge Northrop XB-49 jet-powered bomber flying wing 1948 Chance-Vought produced Cutlass standard Navy carrier jet fighter swept-wing tail less 1950 enrolled Aero Engineering Department Mississippi State junior senior years specialized studies tailless craft Vought worked prototype Regulus cruise-type mis sile along way acquiring share Bowlusand earning commercial glider rating last two-digit US Silver Badge Soaring Mississippi studies concluded plank config uration best try Mississippi State place days Al came under influence Gus Raspet formed lifetime associa tion avid modeler full-scale flier Dick Johnson knew Gus inquisitive genius sat him basement Long Island home cigar box small hole side Hed blow cigarette smoke box close lid gently tap far side box Lovely expanding smoke rings traveled like procession ghosts across room What doing Search blowing smoke probably Mississippi commercial aircraft makers embarrassed superb performance Wittmans Tailwind Gus obtained plane Wittman took off prop covered thing tufts show airflow towed make studies experimented blown wings kind fan wing powered separate power source believe approach power plant failed giving fatal case asym metric lift Gus fine sailplane pilot Back Vought early SOs Backstrom doodled 36-ft plank aspect ratio 9-plus profile test model flew well enough demonstrate soaring potential impressed associates said Lets build 1954 26-ft 5in EPB-1 flying 1 956the ship good enough students few solo hours fly well famous pilots like Paul MacCready Gossamer fame Dick Schreder Paul Bickle Ted Jancrarek developed aerobatic routines flew air shows plank Building powered version done Van White director Experimental Aircraft Assn Dick Johnson engine genius Plans sold least several EPB-1As showed up beginning Suffice say comprehensive article appearead Bungee Cord summer 1981 issue various powered variations theme published SportAviation February 1976 February 1980 latter included full-color center spread Having unmercifully meat-axed vast material hoped nevertheless drawings will tickle fancy inspire daring create good-flying conversa tion pieces should fun Radio Control would dare say keep under control Wing loading tease have thing about wing loadings business dividing gross weight ounces square feet area Example 72 oz divided 4 sq ft equals 18 oz per sq ft loading Since little planes flit bigger ones fly nicely assumption best wing loading across board valid increas ingly useless wide variations scale things Ive wished print pundits would plot handy way us pinpoint realistic wing loading match designs think weights Jim Walkers Sonic Control Glider held Jim appeared 1954 Air Trails Annual flight photo showed Jim biowing through big party-type horn piane guidance subject mooing cows things sharing frequency Structural shot right emphasizes loveiy iines slmpiicity Note gussets used today Giant Scaic Jim found covering loose wouldnt act like drum 32 Model Aviation ~reate own oia-timerr JCTT Mcammant Cioud Nine original CA Special Enya powered three channels 4 lb 58-in span Finish Koverall Sig dope old-style 29 square Intake cost him 810 guy didnt like Jeff does snaps fun stuff under SOft Features lifting tail big ventral fin knock-off gear downthrust rock-back dihedral centerline front dowel stringered top oh big windows Finding field boxes heavy enough get banned some hIgnwa uruunnuiun devised stand lightweight 1-in PVC pipe Disassembles quit V Ig Tint car trunks its often transported plane place van Various easy-to-carry support boxes used required round out setup Plc right shows spring clips holding sembly together Plane left plc may Big Bird featured RCM some years back sizes suspect missing link ABC stuff aerodynamicist Two readers make interesting remarks pique hackers curiosity Like great majority cant bothered would know digest available material fiddle pocket calcu lator Thats reason think ing nice would someone caine up useful curves could pinned shop wall Roy Strader teethed ROGs 1929 Now Rubber Scale Old-Timers Antiques offers .. just rambling resume some items have thinking about discussing About some differences per formance size reduced increased think forget wing craft three-dimensional item wing dimensions doubled volume increased eight-fold makes quite difference volume air wing displaces course reducing wing dimensions has same effect other direction foregoing does explain what happens wing dimensions changed dont know details changes least before changes made OK think two-dimensional good enough everyday flying threedimensional Cube square exact Does Roy mean aspect ratio changing wing dimensions goes item called span loading Au referred span loading too pounds sup ported perfoot span ounces per inch foot fyou fiddle tiny models craft some designers seem ignore both design models fullscale aircraft Piper started trend Pacer its low aspect-ratio wing suppose interests cost andweight Some EAAers go same route designs seem surprised performance increase add couple feet wings span Well course EAAers add span increase aspect ratio wing area thereby also reduce wing loading Roys point aspect ratio know dont want high-drag 5-to-i wing championship Sailplane Piper may have other thoughts well Pacer older Pipers prior chubby Vagabond followed Pacer TnPacer long-winged Piper arrived cleaned-up Super Cruiser cowled Cubs became necessary truly slow up approach holding nose highfuse lage parallel horizonto increase sink rate could overshoot pretty long runway ground effect Flaps appeared later Super Cruisers Pacer landed like real airplane say settled solidly did float like J-3s T-Crafts bumpy days highaspect jobs gave rough ride whereas low-aspect Pacer TnPacer et al smoothed things out comparison higher span loading loose similarity model ing would Monarch Kadet Strader has valid points Now meet Jeff McCammant editor Marshailtown RCers Flyer extro verted ancient born dissenter comes like Midwestern tornado RC four years has several thousand words wild fun stuff first nocent paragraph has compass spinning like Cox 010which say about 30000 rpm Wing loadings wing loadings gins scaling up down Well happened upon enlightening article Ron St Jean says incorrectly considering relationship scale up down air holds wing aloft scale-up square Two dimensional Yet atmosphere three-dimensional cube Basically St Jean says consider wing loading consider loading per cubic inch volume wing occupies send copy Judge yourself think awe-inspiring especially look charts speak truth article St Jean blank now although editor appeared August 1959 MAN Free Flighters know St Jean famous Ramrod FF also MAN Ron cool cat just lately developed Nordics latemodel FFs using simple composites frameless flying surfaces light strong Rons Wing Loading Three-Dimen sional article major feature graphs demonstrate dramatically precision three-dimensional wing loading applies sizes weights models two four charts will see some pundit did provide 1959 curve always wanted Perhaps can ask MAN make Xerox copies pages 22 23 41 44 two additional pages back book material page numbers appear McCammants copies urge MANs editor republish sig nificant report subject universal important RC ironic twist wondered about charting wing loading curve values increasing scale Continued page 34 tables two four appeared August1959 issue ModeIAiiplane News article Ron St Jean entitled Wing Load ing Three Dimensional Ramrod Free Flight model numbers indicate wing areas sizes having similar glides Fig 1 shows great variations loading according traditional two-dimensional calculations Fig 2 shows almost identical loadings figured three dimensionally Winterfeels material significant designers including RC foraccurate relationships scaling up down April 1986 33 Like CAP 21 lathe stab prove validity flying wings Bill Evans uses elevons rudder control full aerobatics pattern 72-In bird 05 61 Capacitive Discharge Ignition CH Electronics Breakerless CD Ignition System can installed engine 15 large chainsaw type new 90 15 twa four stroke engines perfect far converting CH Ignition system new kits plans airplanes just becoming available perfect size engine Four stroke engines beautiful ign Detonation death four stroke enginewhen control engine timing can stop detonation makes engine run much cooler & develops power-plus no kickback 8 very low idle CH system used engine expertsMaynard Hill George Aidridge Doran Hiatt Cliff Bennett Otto Bernhart Maynard Hill used CH system last two world records Available two four stroke engines single twin cylinder Throttle Coupled Spark Advance kits available far popular engines Custom engine set-up available Call write price quote Now fETC electronic timing control information brochure price list send $1 00 CH Electronics Inc MODEL MOTOR MUGTM high quality totally glazed ceramic engine mug must modeler Standing 51/ inches tall large 10 oz capacity its real attention getter definite collectors piece years come OnlyPlus $200 postage $695and handling per order CA residents add sales tax Box 1732 Riverton WY 82501 Phone 307-8576897 REPLACEMENT PARTS FOR Kraft Engines Thator/ McCoy TaIpan 40 RJL ENGINES Call Only Factory Source RJL INDUSTRIES Free Parts Catalog Available increased looking right-hand column Fig 2 wing loading terms oz/cu ft value increases note cube square appear fall straight line curve think will quit am still behind Said St Jean mewhat surprised find recent years As could did glide well C jobs come wondered What happened Reynolds Number repealed small engines become much hotter size larger engines did fact old wing loading rule abolished have something check out latter possibility Ron continued computed wing loadings Ramrod fleet coming up information Fig 1 As can seen tables very definite progression evident small models having much lower wing loading large ones yet glides sinking speeds dif ferent-sized Ramrods pretty much same felt found answer certainly didnt understand until day hit us like bolt years have thinking wing loading terms much per square something other wing two-dimensional thing threedimensional loading should figured volume area basis has chord span thickness well test hypothesis quickly checked out calculating wing loading much per cubic inch rather square inch make measure wing volume first determined actual rib area typical Ramrod wing section divided chord area value order arrive measure average thickness Multiplying average thickness particular wing its area would produce volume cubic inches As shown table dividing weight ounces figure gives us threedimensional cubic wing loading ounces per cubic inch various-sized Ramrods Fig 2 As can seen table cubic wing loading almost identical through various sizes since models have addition equivalent gliding ability statement principle seems order scaling design different size retain same glide wing volume should made directly proportional weight Au Italics since dealing same design can make weight propor tional cube span 3/2 power area square root area cubed results same important thing being put measure wing three-dimensional terms now apparent us figuring wing loading ounces per square foot square inch useful measure Continued page 36 34 Model Aviation r RIL Industries ox 5654 dena CA 91107 Phone 818 359-0016 iLJL1 L LLL 13311 Beach Ave na Del Rey CA 1J 1-624 0@00000so@oso@o@o@o@o@o@O L VIDEO 0 HOBBY RETAILERSS Answer YesI 0 4 ESPONSE YOUR OVERWELMING0 DEMANDS WE NOW HAVE SOLID DEALERQ PLAN EXCLUSIVELY FOR YOUI YOU CAN NOW RENT OR SELL OUR VIDEO PROGRAMS FOR UNLIMITED PROFITS HERE IS INVESTMENT THAT PAYS FOR ITSELF WHILE PAYING YOUR CASH PROFITS AMONG OTHERS Q WHAT ELSE DO YOU HAVE IN YOUR STORE THAT DOES THIS WITH OUR EXTREMELY POPULAR LANE FUNNIES IN YOUR VIDEO UNEUP ADDITIONAL PROFITS CAN BE IN YOUR CASH W DRAWER AS SOON AS NEXT WEEK IF YOU ACT NOWI LETS FACE IT THE BOlTOM LINE IS Q MAKING MONEYI COMPLETE PLAN DETAILS AND SPECIAL LOW INTRODUCTORY PRICE ARE READY TO BE SENT JUST MAIL OR PHONE IN YOUR INOUIRY NOWI Send Inquiries W ACADEMY OF AVIATION RESEARCH & DEVELOPMENT PO Box 277 Hazel Crest IL 60429-0277 13121 335-O7 0@@ 00 ATT-CHEKi ON-Board Battery Tester Saves Time. Saves Models BATT-CHEK RX-1 $1495 n USA NEW Install RC Models Check receiver battery status press button Small Light 1/2 oz Precise Rugged ORDER TODAY dealer Protune Corp 1914 462-6452 PO Box 1808 Poughkeepsie NY 12601 TARBaby Especially Turn-around 850 sq 120 4 cycle powered Ron Chidgey design smooth solid performer Rib templates computer plotted Plans construc tion hints- $1195 TRANSMITTER CASE An inespensive rugged molded case protect expensive transmitter both two stick single stick transmitters Brown leather grain aluminum trim locking clasp $1895 WING TUBE & SOCKETSNEW WING MOUNTING SET Aluminum alloy tubing plug-inA wing mounting system developed Ron Chidgey wings Included pair ofthat fast neat accurate stays tight Three special slip fit phenolic socketsnylon brackets screws machined wing blocks build wing structureincluded -$695 Now size models 718 dia s 2 $ 8g5 1 dies 2$ gg 1 dia x3 -$1495 P Gator RIO Products 3713 Pompano Dr See Dealer Order Direct Pensacola FL 32514for UPS Phone AC 904 476-8639Include $150 Per Item TORK-STARTER revolutionary concept power iSV glow plugs model cars boats air plenes using glow fuel engines TORK-STARTERITMI has steel wrench strong W enough reduce compression easier starting supplies power doing comes new CuD charger has LED indicate nhe unit charging also has removable T handle can used Torque amplIfier Over 50 consecutive starts full charge rechargeable hundreds times Clips onto plug positive connection Send ad along prepayment receive MFG OF NI-STARTER free shipping handling TORK-STARTER T$2995 Charger NOV 22tV 12V Fast Chartvrl $2995 $2095 Without Charger Charger CHARGERS PLEASE SPECIFY WHICH CHARGER 95 Charger Only WHEN ORDERINGII tOy 220V 12V Fast Chargtrl 12421 Ransom Dr. Glenn Dale MD 20769301 464-2260 comparison between models almost same sizes con sidered real fallacy making wing loading comparisons area basis co-mingling oranges apples speak weight three-dimensional area two-dimensional direct comparison need express terms other will same dimension whether two three Poor Jeff McCanimant writes wonderful letter talk about St Jean Third Dimension Saying modeler since day born beats proud designing own stuff ant-eating own parts building flying alone really blooming extrovert Heres what said about training Being. way am rejected normal way learning fly RC popular way accepted around 40-powered four-channel trainer first differently wanted Sailplane Jeff declares So got Sig Riser Rider put power pod Thats revolutionary No other way fly start engine radio toss climb play land feet again Theres no running get 900-ft highstart line no tow hooks etc taught myself fly Never instructor Now three years later club has people fly Gliders power pods started almost nobody thought flying Gliders Glider gives plenty reaction time Jeff makes sense too am block headed Listen up quiet airstrip Doug Pratt flying simultane ously now Kracketjac new Rookie pennants drooped tennas soft Bahamian air two Enya four-strokes purred quietly impacting dream-world environment yellow low-winger red cabin ship against deep blue sky eight minutes both planes trimmed hands off switched transmitters What rare experience fly two own planes flight different As sun sank beginner never taken off landed himseW appeared RCM 40 knocking knees Doug took oft flew superbly low-key support talk reassuring him fast nicely-banked approaches did flawlessly mentioned flown Gentle Lady didnt count leftright days behind him Thats giant first step Doug said after learned fly MRC Chipmunk Doug years ago snap rolling second flight too flown Gentle Lady same quirk young beginner friends didnt count What Ive talked truly hot-start beginners given truth serum confess good times Gentle Lady others like find myself perplexed strangers ask about getting started usually no help want anything better knowing resistance real primary trainers some stigma cross mental fingers suggest Gentle Lady does have say something power training such models climb slowly mope along good podmounted 049 myself Id put engine nose Its good plane beginning Electrics too Start popular 05 electric motors six 12 Ah Sanyo cells later may want try SR batteries other props cells folders cobalt motors reduction drives etc keep start simple going swallow tub-thumping jargon argot insist fast 40powered animal four channels little forgiveness thats fine sellers accessories include certified instructor great communicator under stands children work living youll have wait instructor busy Sunday good guys similarly desperate fly youll wallflower fruitless Sundays ticking away like taxi meterif active site busy club However learn solo yourself path easier have flown form model past wont let fly site until youve demonstrated proper solo flight Few instructors able willing give feel flight itself understand inner nature little beasts begin Glider select kit shows rigging power pod Thrust lines important example nose-mounted glow engine electric mo tor will require downthrust model will stall easily under power spells sloppy flight floundering con trol under power airspeed higher design speed Glider producing excess lift downthrust counteracts excess lift nose-mounted power source will need least 20 down maybe 40 50 pod engine motor high above both center gravity center drag has effect similar downthrust may enough paraphrase Will Rogers said never met man didnt like never met field box 1 did like Life simple doorbell battery Pandoras shoebox jug wine gas/oil 5% glow thou airplane 1950 guy named Broadfield discovered later have big manufacturer balsa gliders ROGs during 20s appeared Long Island field field box detachable legs man didnt come down trees got off knees standup starting two U-shaped saddle pieces inserted hold model days box standing crosswind light 6-ft cabin ship top often blew over after-shock splintering noises ol boy gifted bunch us boxes cried foul bills arrived Can imagine gall Seven bucks came starters wet cells glow Continued page 122 Youli Soar Unimagined Heights Now can build paper airplanes fly high far masters Paper Airplane Book official book Second Great International Paper Airplane Contest Youll get tips winners blueprints prize winning designs instructions build own high-flying planes Learn Secrets Japanese Air Superiority reason Japanese hold paper airplane records paper use Its never available count. until now including enough sheets exclusive paper make several models own Prepared editors Science 86 Paper Airplane Book beautifully designed high-quality photography winning entries Second Great International Paper Airplane Contest Its perfect gift paper pilots ages Special Offer Science 86 Through special arrangement Random House Science 86 now accepting orders PaperAirplane Book just $895 order copies just fill coupon below mail us check money order Please send mecopies PaperAirplane Book $895 plus $175 postage handling Mail tO Science 86 Airplane Book PO Box 10982 'DesMoines Iowa 50340 Total amount order $________ D Enclosed check money order made payable Science 86 Eli Please charge my[]Visa MasterCard rn Date Siomt,rp Address City State 7in Please allow 46 weeks delivery Outside U5Aadd $250 PAB-MA486 April 1986 37 PILOTS TS RIOR TS T THE MOST SUPERIOR PILOT FIGURE ON THE MARKET LIGHTEST WEIGHT MOST REALISTIC AVAILABLE GIVE YOUR PLANE PILOT FOR YOUR NEWEST OLDEST OR NEXT CREATION R YOURS TODAY FULL FIGURES CIVILIANWWII MILITARY 1/3 Scale $19951/5 Navy $1395 1/4 Scale14951/6AAF1195 1 /5 Scale1295 Plus 1/12 Scale895$250 shipping 1/12 Chopper 895each figure KNIGHTS OF THE AIR 1400 Rte 22 West Friendship MD 21794 301-489-5050 Letters Editor Continued page 12 compiling error having gone undetected long quantity E1115/61 usually much smaller quantity L*S2/Sl As such little error pro duced used probably noticed attributed geometric variations actual model Mr Donatelli found error may have used design di mensions producing severe imbab ance So Line 760 should read PL*S2/SlE1/15/Gl apologies error must lot modelers out computers already getting mail about article Design Analysis Program Dick Sarpolus Shrewsbury NJ Safety Preston Continued page 20 stated experiencing prob lems some parts country RC cars buggies using frequencies reserved aircraft. Perhaps Davids label suggestion can help alleviate some problems FlutterAnother item mentioned last months Safety column suggestion modeler should man datory checks models prevent con trol surface flutter November 1985 issue Corsair newsletter Joint Military R/G Fliers Club editor Marlin Kinning article flutter written noted modeler Cliff Weirick benefit readers may know what flutter can model Im reproducing Cliffs article FLUTTER Most know what seem some fliers dontor dont care break flutter down two levels full blown FLUTTER very destructive force second BUZZ Buzz too very destructive force slightly dif ferent way Lets look FLUTTER first can destroy airplane quicker can blink eye can attack sur face plane its prime targets ailerons followed closely elevator rudder flutter starts matter time until surface itself leaves plane takes sur face attached case two wings elevator counts up three airplanes stunt job wing failure next two Formula Ones Another aileron wing other elevator Actu ally very famousor should say infamouscrash lot oldtimers will remember Nats Los Alamitos NAS Boy what mess Now know what flutter can lets think about BUZZ hard describe because cant hear power model unless engine dead can hear flutter loud est engines whining away Buzz tends destroy servosand ultimately plane tends ruin gears worse yet attacks feedback pot ser vo does wearing small area usually around level-flight neutral position happens wonder sometimes controls may act funny What causes buzz Primarily two things Loose control surfaces sloppy tail-heavy loose sloppy pushrods etc see control surfaces look ready fall off airplane yet pilots ignore Same way pushrods Some builders drill %2-in holes control horn use 46-in wire Thats really asking sum up check things time go out fly remem ber tight will wear out get loose Have safe moath John Preston 12235 Tildenwood Dr Rockville MD 20852 responding advertisers mention read aboutthem ModelAviation drivers fuel pumps rolled aisles over power panels gallon fuel cans transmitter tray must got hand-held units Field boxes heavy wacky high-techand prop can cost seven bucks about power panel under nose run engines fancy hinged lids prevent getting anything plane figure top wedding cake ends up ground crawling aroundeasier get ting up down like jive puppet Im back knees now cant get up Legs no legs question Bill H Greenhalgh man after own heart dont have ambition brains too suffering herd guy lives place called Wetumpka Alabama must have right stuff am another old coot Au Good name next modeL built first model airplane back 1920s Bill edifies us after 30 years Air Corps/Air Force another 10 years doingthings government heart problem came back modeling After building Sig Kadet bitten RC bug since have built several airplanes mostly scratch Being too old hands knees bit fueling starting airplanes put folding legs huge field box raise level permitted work standing position course field box/stand weighed much took two us move After building some plant stands PVC plastic pipe wife realized could have light field stand could handle easily comfort several months now have using stand shown enclosed photographs Built 1-in PVC pipe consists two ends two shelves supports airplane fastened ends bolts wing nuts permitting quicikly change fit different fuselages padding fuselage supports insulation sold PVC pipes 1 22 Model Aviation Plane Talk/Winter Continued page 37 two shelves simply two straight pipes held together sheet hardboard shelves ends joined spring clips shown pictures whole thing disassembles quickly fit car trunks room spare usually leave assembled carry airplane van Once decided sizes wanted figured out parts list construction took less hour expenditure less $10 field stand doubles great work stand shop stand problem solved turned problem equipment carried old field box Using scrap plywood built three boxes fueling box carries half-gallon plastic fuel tank 12-volt battery electric fuel pump starter box includes 12-volt battery power panel storage space glow plugs small tools electric starter tool box has drawer small tools parts storage compartments spare propellers larger tools equip ment cleaning equipment other essential items seldom needed put cleats ends bottom box fit over shelves keep boxes vibrating off shelf boxes quite light easily handled two 12-volt batteries provide back up prevent loss flying session forget charge Add folding chair jug coffee iced tea depending upon tempera ture have makings com fortable enjoyable flying session know youngsters will sneer such sissy stuff thought would pass along whatever worth hope will interest some other old-timers senior citizens seem coming RC hobby simplifi cation equipment might ensure sustained interest pleasant flying field conditions Thus spake Bill Greenhalgh Wetump ka AL Favor requested Will something cause close heart February 1986 ModelAirplane News Hal deBolt began new long-needed feature Golden Age RC has making long time us have put heads together help make possible always wanted self colunm specifically RC have interest Antique OldTimer modeling SAM Society Antique Modelers makes go Thats primarily based old Free Flight models RC-assist involved interest Old-Timer Control Line models obvious potential RC its own right has neglecteduntil now know 1950s 6-ft 35powered Smog Hog example does anything can Saturday Night Specialexcept go straight up Its easier safer fly things flown now came low-wing Smog Hog Sig Mfg Co perceived Kasmirski 45-powered Orion 1960 Aero batics World Champion still matches performance modern engine anything can think hot aerobatic airplane hundreds published once-kitted wonderful air planesdeltas canards name Ob viously an Antique era OldTimer era Nostalgic erastarting things like Goods Big Guff prewar days Taurus Orion 1960 Buzzard Bombshells could promote competitions aware majority will prefer simply enjoy flying historic planes Please contribute Hals column us hundreds pictures out Send background info Harold deBolt 2206 Greenwich Dr Kings Pt Sun City Center FL 33570 Without contributions column like deBolts cannot continued indefi nitely Photographic examples particular needed Falcon OldTimer dating late SOs Beams Esquires H-Rays Berkeleys Hollinger J 3 Fairchild PT on Walt Goods series history Radio Control began last month Chet Lanzo has asked help major presentation 1934 RC-1 prehistoric radio gear People keep building Krackerjac Rookie designers have same experience Beyond historic stuff now appearing magazine no continuity except deBolts Golden Age thing requires everyone interested assure prospers pictures good information Mining gold depends have gratitude joining effort Before long youll have yourself thank having bothered Bill Winter 4432 Altura Ct Fajifax VA 22030 Radio Technique/Myers Continued page 38 buy products object will likely accompanied warning literature manufacturer will receptive constructive criticism object being sold lacks such obvious liability/litigation potential manufacturers interest usually concen trates itself price profit performed static structural load test airplanes towhook/fuselage/wing combination Jugs water provided test load pint water weighs pound Note done before wing covered wing should depend covering strength sides something cracks want see well hear wing spar strong enough Only dowel needed changed Continued page 126 April 1986 123 C C El I m z 0 z z C 0 0 m I m 0 q 0 CD C 0 0 C -4 0 CD 0 Co U 0 -L N 0 0 01 x x N
Edition: Model Aviation - 1986/04
Page Numbers: 30, 31, 32, 33, 34, 36, 37, 122, 123
Bill Winter _____T12ILX E1Z0 0 Plane Talk Left Leading off Al Backstroms tailless fantasies Hoffman Wing follow-up Arup remember Smilin Jack comic strip Hoffman chief engineer Very stable model manyflights rubber now perks CO-2 Configuration less sensitive CG shifts conventional planes Tips ailerons Winter drawing large possible RC Right all-sheet Waterman Aerobile taughtAl iittl@ because always flew well Did 4Osec indoors its third flight now worn out flying ceiling hits Al has bigger built-up glow version Winterthinks RCM published RC Full-size plane Guggenheim Safety Plane competition 30s Above Lipplach Delta precursor postwar delta fighters High aspect ratio makes model extremely hard adjust Large props OK pusher tractor version Delta II would tolerate power burstof a4-in prop Both flew notwell Buildercon alders flops Right Backatroms model own successful full-scale plank Best flier series does 60 sec Cat site Left tractor stick isa tailless version Dr Lippiachs semi-ground-effect machine has flown several times never ROW Intended Right Backatroms neat Peanut Nicuport 11 Nowlen Aero kit experimental jobs displays nifty work manship nonetheless Nieuport consistently turns pretty flights though long duration Backatrom would like 30 Model Aviation L1JiJ~ FIG NOTE Long short wing versions FIG C 11 III / I/ Final version Backstroms pusher-engined plank has 110 flIght hours Insert side view tip fin isa drag rudderwhich hinges outward Dick Johnsons engine concept 16- 20-hp twin belt-driven countershaft top-mounted prop larger side view shows reflex alrfoli pusher props thrust line I Future possIbilities could include twin having delta-shaped center section area profile sketch shows airfoils thrust lines As planned two Johnsons twin-cylinder engines would used turning singie-biaded Evereil propellers TWILIGHT ZONE Lincoln Beachey glamour pilot early century said Give barn door Twill fly Al Backstrom would horrified being compared immortal Beachey indeed quite mortalgoing out boots thrilling multitudes San Francisco Golden Gate Exposition 1915 Al designs flies full-scale planks Planks go way back notably Europe Backstroms addiction finicky birds both gliders powered has found attention home-builders long involvement fringe-stuff models similarly reflects lifetime fascination gliders tailless aircraft Whats plank As see drawings plank usually paralleledged wing tailless generally assumed have no sweep heavily reflexed airfoil makes stable Well concentrate full-scale work Backstrom friends Backstrom finds No-Cal rubber-pow ered quickies especially useful look bit rough dont fooled include Nieuport 11 Peanut show capability modeling approach no fuss no feathers modeling inspired Air Trails late 30s AT covers things like Zanonia Bowlus sailplanes fired imagination articles about Northrop wings other novelties such Waterman Arrowbile convinced him such designs would fly models During epic interruption NW II became first student proposed gliding school shootingwas overthatfallofl945but EPB-iC 1965FiG D Al Cleaves 1965 modifications Backstroms 1954 EPB-1 glider uses center fin/rudder Winter says guestimating sport model hed expect CG close 15% chord hed use 5 dihedrai three-channel version 3 ailerons used modei would probably need aft vertical area especially ailerons April 1986 31 sent Pacific 1946 drifted joining Northrops engineering school 1947 saw flights huge Northrop XB-49 jet-powered bomber flying wing 1948 Chance-Vought produced Cutlass standard Navy carrier jet fighter swept-wing tail less 1950 enrolled Aero Engineering Department Mississippi State junior senior years specialized studies tailless craft Vought worked prototype Regulus cruise-type mis sile along way acquiring share Bowlusand earning commercial glider rating last two-digit US Silver Badge Soaring Mississippi studies concluded plank config uration best try Mississippi State place days Al came under influence Gus Raspet formed lifetime associa tion avid modeler full-scale flier Dick Johnson knew Gus inquisitive genius sat him basement Long Island home cigar box small hole side Hed blow cigarette smoke box close lid gently tap far side box Lovely expanding smoke rings traveled like procession ghosts across room What doing Search blowing smoke probably Mississippi commercial aircraft makers embarrassed superb performance Wittmans Tailwind Gus obtained plane Wittman took off prop covered thing tufts show airflow towed make studies experimented blown wings kind fan wing powered separate power source believe approach power plant failed giving fatal case asym metric lift Gus fine sailplane pilot Back Vought early SOs Backstrom doodled 36-ft plank aspect ratio 9-plus profile test model flew well enough demonstrate soaring potential impressed associates said Lets build 1954 26-ft 5in EPB-1 flying 1 956the ship good enough students few solo hours fly well famous pilots like Paul MacCready Gossamer fame Dick Schreder Paul Bickle Ted Jancrarek developed aerobatic routines flew air shows plank Building powered version done Van White director Experimental Aircraft Assn Dick Johnson engine genius Plans sold least several EPB-1As showed up beginning Suffice say comprehensive article appearead Bungee Cord summer 1981 issue various powered variations theme published SportAviation February 1976 February 1980 latter included full-color center spread Having unmercifully meat-axed vast material hoped nevertheless drawings will tickle fancy inspire daring create good-flying conversa tion pieces should fun Radio Control would dare say keep under control Wing loading tease have thing about wing loadings business dividing gross weight ounces square feet area Example 72 oz divided 4 sq ft equals 18 oz per sq ft loading Since little planes flit bigger ones fly nicely assumption best wing loading across board valid increas ingly useless wide variations scale things Ive wished print pundits would plot handy way us pinpoint realistic wing loading match designs think weights Jim Walkers Sonic Control Glider held Jim appeared 1954 Air Trails Annual flight photo showed Jim biowing through big party-type horn piane guidance subject mooing cows things sharing frequency Structural shot right emphasizes loveiy iines slmpiicity Note gussets used today Giant Scaic Jim found covering loose wouldnt act like drum 32 Model Aviation ~reate own oia-timerr JCTT Mcammant Cioud Nine original CA Special Enya powered three channels 4 lb 58-in span Finish Koverall Sig dope old-style 29 square Intake cost him 810 guy didnt like Jeff does snaps fun stuff under SOft Features lifting tail big ventral fin knock-off gear downthrust rock-back dihedral centerline front dowel stringered top oh big windows Finding field boxes heavy enough get banned some hIgnwa uruunnuiun devised stand lightweight 1-in PVC pipe Disassembles quit V Ig Tint car trunks its often transported plane place van Various easy-to-carry support boxes used required round out setup Plc right shows spring clips holding sembly together Plane left plc may Big Bird featured RCM some years back sizes suspect missing link ABC stuff aerodynamicist Two readers make interesting remarks pique hackers curiosity Like great majority cant bothered would know digest available material fiddle pocket calcu lator Thats reason think ing nice would someone caine up useful curves could pinned shop wall Roy Strader teethed ROGs 1929 Now Rubber Scale Old-Timers Antiques offers .. just rambling resume some items have thinking about discussing About some differences per formance size reduced increased think forget wing craft three-dimensional item wing dimensions doubled volume increased eight-fold makes quite difference volume air wing displaces course reducing wing dimensions has same effect other direction foregoing does explain what happens wing dimensions changed dont know details changes least before changes made OK think two-dimensional good enough everyday flying threedimensional Cube square exact Does Roy mean aspect ratio changing wing dimensions goes item called span loading Au referred span loading too pounds sup ported perfoot span ounces per inch foot fyou fiddle tiny models craft some designers seem ignore both design models fullscale aircraft Piper started trend Pacer its low aspect-ratio wing suppose interests cost andweight Some EAAers go same route designs seem surprised performance increase add couple feet wings span Well course EAAers add span increase aspect ratio wing area thereby also reduce wing loading Roys point aspect ratio know dont want high-drag 5-to-i wing championship Sailplane Piper may have other thoughts well Pacer older Pipers prior chubby Vagabond followed Pacer TnPacer long-winged Piper arrived cleaned-up Super Cruiser cowled Cubs became necessary truly slow up approach holding nose highfuse lage parallel horizonto increase sink rate could overshoot pretty long runway ground effect Flaps appeared later Super Cruisers Pacer landed like real airplane say settled solidly did float like J-3s T-Crafts bumpy days highaspect jobs gave rough ride whereas low-aspect Pacer TnPacer et al smoothed things out comparison higher span loading loose similarity model ing would Monarch Kadet Strader has valid points Now meet Jeff McCammant editor Marshailtown RCers Flyer extro verted ancient born dissenter comes like Midwestern tornado RC four years has several thousand words wild fun stuff first nocent paragraph has compass spinning like Cox 010which say about 30000 rpm Wing loadings wing loadings gins scaling up down Well happened upon enlightening article Ron St Jean says incorrectly considering relationship scale up down air holds wing aloft scale-up square Two dimensional Yet atmosphere three-dimensional cube Basically St Jean says consider wing loading consider loading per cubic inch volume wing occupies send copy Judge yourself think awe-inspiring especially look charts speak truth article St Jean blank now although editor appeared August 1959 MAN Free Flighters know St Jean famous Ramrod FF also MAN Ron cool cat just lately developed Nordics latemodel FFs using simple composites frameless flying surfaces light strong Rons Wing Loading Three-Dimen sional article major feature graphs demonstrate dramatically precision three-dimensional wing loading applies sizes weights models two four charts will see some pundit did provide 1959 curve always wanted Perhaps can ask MAN make Xerox copies pages 22 23 41 44 two additional pages back book material page numbers appear McCammants copies urge MANs editor republish sig nificant report subject universal important RC ironic twist wondered about charting wing loading curve values increasing scale Continued page 34 tables two four appeared August1959 issue ModeIAiiplane News article Ron St Jean entitled Wing Load ing Three Dimensional Ramrod Free Flight model numbers indicate wing areas sizes having similar glides Fig 1 shows great variations loading according traditional two-dimensional calculations Fig 2 shows almost identical loadings figured three dimensionally Winterfeels material significant designers including RC foraccurate relationships scaling up down April 1986 33 Like CAP 21 lathe stab prove validity flying wings Bill Evans uses elevons rudder control full aerobatics pattern 72-In bird 05 61 Capacitive Discharge Ignition CH Electronics Breakerless CD Ignition System can installed engine 15 large chainsaw type new 90 15 twa four stroke engines perfect far converting CH Ignition system new kits plans airplanes just becoming available perfect size engine Four stroke engines beautiful ign Detonation death four stroke enginewhen control engine timing can stop detonation makes engine run much cooler & develops power-plus no kickback 8 very low idle CH system used engine expertsMaynard Hill George Aidridge Doran Hiatt Cliff Bennett Otto Bernhart Maynard Hill used CH system last two world records Available two four stroke engines single twin cylinder Throttle Coupled Spark Advance kits available far popular engines Custom engine set-up available Call write price quote Now fETC electronic timing control information brochure price list send $1 00 CH Electronics Inc MODEL MOTOR MUGTM high quality totally glazed ceramic engine mug must modeler Standing 51/ inches tall large 10 oz capacity its real attention getter definite collectors piece years come OnlyPlus $200 postage $695and handling per order CA residents add sales tax Box 1732 Riverton WY 82501 Phone 307-8576897 REPLACEMENT PARTS FOR Kraft Engines Thator/ McCoy TaIpan 40 RJL ENGINES Call Only Factory Source RJL INDUSTRIES Free Parts Catalog Available increased looking right-hand column Fig 2 wing loading terms oz/cu ft value increases note cube square appear fall straight line curve think will quit am still behind Said St Jean mewhat surprised find recent years As could did glide well C jobs come wondered What happened Reynolds Number repealed small engines become much hotter size larger engines did fact old wing loading rule abolished have something check out latter possibility Ron continued computed wing loadings Ramrod fleet coming up information Fig 1 As can seen tables very definite progression evident small models having much lower wing loading large ones yet glides sinking speeds dif ferent-sized Ramrods pretty much same felt found answer certainly didnt understand until day hit us like bolt years have thinking wing loading terms much per square something other wing two-dimensional thing threedimensional loading should figured volume area basis has chord span thickness well test hypothesis quickly checked out calculating wing loading much per cubic inch rather square inch make measure wing volume first determined actual rib area typical Ramrod wing section divided chord area value order arrive measure average thickness Multiplying average thickness particular wing its area would produce volume cubic inches As shown table dividing weight ounces figure gives us threedimensional cubic wing loading ounces per cubic inch various-sized Ramrods Fig 2 As can seen table cubic wing loading almost identical through various sizes since models have addition equivalent gliding ability statement principle seems order scaling design different size retain same glide wing volume should made directly proportional weight Au Italics since dealing same design can make weight propor tional cube span 3/2 power area square root area cubed results same important thing being put measure wing three-dimensional terms now apparent us figuring wing loading ounces per square foot square inch useful measure Continued page 36 34 Model Aviation r RIL Industries ox 5654 dena CA 91107 Phone 818 359-0016 iLJL1 L LLL 13311 Beach Ave na Del Rey CA 1J 1-624 0@00000so@oso@o@o@o@o@o@O L VIDEO 0 HOBBY RETAILERSS Answer YesI 0 4 ESPONSE YOUR OVERWELMING0 DEMANDS WE NOW HAVE SOLID DEALERQ PLAN EXCLUSIVELY FOR YOUI YOU CAN NOW RENT OR 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Saves Models BATT-CHEK RX-1 $1495 n USA NEW Install RC Models Check receiver battery status press button Small Light 1/2 oz Precise Rugged ORDER TODAY dealer Protune Corp 1914 462-6452 PO Box 1808 Poughkeepsie NY 12601 TARBaby Especially Turn-around 850 sq 120 4 cycle powered Ron Chidgey design smooth solid performer Rib templates computer plotted Plans construc tion hints- $1195 TRANSMITTER CASE An inespensive rugged molded case protect expensive transmitter both two stick single stick transmitters Brown leather grain aluminum trim locking clasp $1895 WING TUBE & SOCKETSNEW WING MOUNTING SET Aluminum alloy tubing plug-inA wing mounting system developed Ron Chidgey wings Included pair ofthat fast neat accurate stays tight Three special slip fit phenolic socketsnylon brackets screws machined wing blocks build wing structureincluded -$695 Now size models 718 dia s 2 $ 8g5 1 dies 2$ gg 1 dia x3 -$1495 P Gator RIO Products 3713 Pompano Dr See Dealer Order Direct Pensacola FL 32514for UPS Phone AC 904 476-8639Include $150 Per Item TORK-STARTER revolutionary concept power iSV glow plugs model cars boats air plenes using glow fuel engines TORK-STARTERITMI has steel wrench strong W enough reduce compression easier starting supplies power doing comes new CuD charger has LED indicate nhe unit charging also has removable T handle can used Torque amplIfier Over 50 consecutive starts full charge rechargeable hundreds times Clips onto plug positive connection Send ad along prepayment receive MFG OF NI-STARTER free shipping handling TORK-STARTER T$2995 Charger NOV 22tV 12V Fast Chartvrl $2995 $2095 Without Charger Charger CHARGERS PLEASE SPECIFY WHICH CHARGER 95 Charger Only WHEN ORDERINGII tOy 220V 12V Fast Chargtrl 12421 Ransom Dr. Glenn Dale MD 20769301 464-2260 comparison between models almost same sizes con sidered real fallacy making wing loading comparisons area basis co-mingling oranges apples speak weight three-dimensional area two-dimensional direct comparison need express terms other will same dimension whether two three Poor Jeff McCanimant writes wonderful letter talk about St Jean Third Dimension Saying modeler since day born beats proud designing own stuff ant-eating own parts building flying alone really blooming extrovert Heres what said about training Being. way am rejected normal way learning fly RC popular way accepted around 40-powered four-channel trainer first differently wanted Sailplane Jeff declares So got Sig Riser Rider put power pod Thats revolutionary No other way fly start engine radio toss climb play land feet again Theres no running get 900-ft highstart line no tow hooks etc taught myself fly Never instructor Now three years later club has people fly Gliders power pods started almost nobody thought flying Gliders Glider gives plenty reaction time Jeff makes sense too am block headed Listen up quiet airstrip Doug Pratt flying simultane ously now Kracketjac new Rookie pennants drooped tennas soft Bahamian air two Enya four-strokes purred quietly impacting dream-world environment yellow low-winger red cabin ship against deep blue sky eight minutes both planes trimmed hands off switched transmitters What rare experience fly two own planes flight different As sun sank beginner never taken off landed himseW appeared RCM 40 knocking knees Doug took oft flew superbly low-key support talk reassuring him fast nicely-banked approaches did flawlessly mentioned flown Gentle Lady didnt count leftright days behind him Thats giant first step Doug said after learned fly MRC Chipmunk Doug years ago snap rolling second flight too flown Gentle Lady same quirk young beginner friends didnt count What Ive talked truly hot-start beginners given truth serum confess good times Gentle Lady others like find myself perplexed strangers ask about getting started usually no help want anything better knowing resistance real primary trainers some stigma cross mental fingers suggest Gentle Lady does have say something power training such models climb slowly mope along good podmounted 049 myself Id put engine nose Its good plane beginning Electrics too Start popular 05 electric motors six 12 Ah Sanyo cells later may want try SR batteries other props cells folders cobalt motors reduction drives etc keep start simple going swallow tub-thumping jargon argot insist fast 40powered animal four channels little forgiveness thats fine sellers accessories include certified instructor great communicator under stands children work living youll have wait instructor busy Sunday good guys similarly desperate fly youll wallflower fruitless Sundays ticking away like taxi meterif active site busy club However learn solo yourself path easier have flown form model past wont let fly site until youve demonstrated proper solo flight Few instructors able willing give feel flight itself understand inner nature little beasts begin Glider select kit shows rigging power pod Thrust lines important example nose-mounted glow engine electric mo tor will require downthrust model will stall easily under power spells sloppy flight floundering con trol under power airspeed higher design speed Glider producing excess lift downthrust counteracts excess lift nose-mounted power source will need least 20 down maybe 40 50 pod engine motor high above both center gravity center drag has effect similar downthrust may enough paraphrase Will Rogers said never met man didnt like never met field box 1 did like Life simple doorbell battery Pandoras shoebox jug wine gas/oil 5% glow thou airplane 1950 guy named Broadfield discovered later have big manufacturer balsa gliders ROGs during 20s appeared Long Island field field box detachable legs man didnt come down trees got off knees standup starting two U-shaped saddle pieces inserted hold model days box standing crosswind light 6-ft cabin ship top often blew over after-shock splintering noises ol boy gifted bunch us boxes cried foul bills arrived Can imagine gall Seven bucks came starters wet cells glow Continued page 122 Youli Soar Unimagined Heights Now can build paper airplanes fly high far masters Paper Airplane Book official book Second Great International Paper Airplane Contest Youll get tips winners blueprints prize winning designs instructions build own high-flying planes Learn Secrets Japanese Air Superiority reason Japanese hold paper airplane records paper use Its never available count. until now including enough sheets exclusive paper make several models own Prepared editors Science 86 Paper Airplane Book beautifully designed high-quality photography winning entries Second Great International Paper Airplane Contest Its perfect gift paper pilots ages Special Offer Science 86 Through special arrangement Random House Science 86 now accepting orders PaperAirplane Book just $895 order copies just fill coupon below mail us check money order Please send mecopies PaperAirplane Book $895 plus $175 postage handling Mail tO Science 86 Airplane Book PO Box 10982 'DesMoines Iowa 50340 Total amount order $________ D Enclosed check money order made payable Science 86 Eli Please charge my[]Visa MasterCard rn Date Siomt,rp Address City State 7in Please allow 46 weeks delivery Outside U5Aadd $250 PAB-MA486 April 1986 37 PILOTS TS RIOR TS T THE MOST SUPERIOR PILOT FIGURE ON THE MARKET LIGHTEST WEIGHT MOST REALISTIC AVAILABLE GIVE YOUR PLANE PILOT FOR YOUR NEWEST OLDEST OR NEXT CREATION R YOURS TODAY FULL FIGURES CIVILIANWWII MILITARY 1/3 Scale $19951/5 Navy $1395 1/4 Scale14951/6AAF1195 1 /5 Scale1295 Plus 1/12 Scale895$250 shipping 1/12 Chopper 895each figure KNIGHTS OF THE AIR 1400 Rte 22 West Friendship MD 21794 301-489-5050 Letters Editor Continued page 12 compiling error having gone undetected long quantity E1115/61 usually much smaller quantity L*S2/Sl As such little error pro duced used probably noticed attributed geometric variations actual model Mr Donatelli found error may have used design di mensions producing severe imbab ance So Line 760 should read PL*S2/SlE1/15/Gl apologies error must lot modelers out computers already getting mail about article Design Analysis Program Dick Sarpolus Shrewsbury NJ Safety Preston Continued page 20 stated experiencing prob lems some parts country RC cars buggies using frequencies reserved aircraft. Perhaps Davids label suggestion can help alleviate some problems FlutterAnother item mentioned last months Safety column suggestion modeler should man datory checks models prevent con trol surface flutter November 1985 issue Corsair newsletter Joint Military R/G Fliers Club editor Marlin Kinning article flutter written noted modeler Cliff Weirick benefit readers may know what flutter can model Im reproducing Cliffs article FLUTTER Most know what seem some fliers dontor dont care break flutter down two levels full blown FLUTTER very destructive force second BUZZ Buzz too very destructive force slightly dif ferent way Lets look FLUTTER first can destroy airplane quicker can blink eye can attack sur face plane its prime targets ailerons followed closely elevator rudder flutter starts matter time until surface itself leaves plane takes sur face attached case two wings elevator counts up three airplanes stunt job wing failure next two Formula Ones Another aileron wing other elevator Actu ally very famousor should say infamouscrash lot oldtimers will remember Nats Los Alamitos NAS Boy what mess Now know what flutter can lets think about BUZZ hard describe because cant hear power model unless engine dead can hear flutter loud est engines whining away Buzz tends destroy servosand ultimately plane tends ruin gears worse yet attacks feedback pot ser vo does wearing small area usually around level-flight neutral position happens wonder sometimes controls may act funny What causes buzz Primarily two things Loose control surfaces sloppy tail-heavy loose sloppy pushrods etc see control surfaces look ready fall off airplane yet pilots ignore Same way pushrods Some builders drill %2-in holes control horn use 46-in wire Thats really asking sum up check things time go out fly remem ber tight will wear out get loose Have safe moath John Preston 12235 Tildenwood Dr Rockville MD 20852 responding advertisers mention read aboutthem ModelAviation drivers fuel pumps rolled aisles over power panels gallon fuel cans transmitter tray must got hand-held units Field boxes heavy wacky high-techand prop can cost seven bucks about power panel under nose run engines fancy hinged lids prevent getting anything plane figure top wedding cake ends up ground crawling aroundeasier get ting up down like jive puppet Im back knees now cant get up Legs no legs question Bill H Greenhalgh man after own heart dont have ambition brains too suffering herd guy lives place called Wetumpka Alabama must have right stuff am another old coot Au Good name next modeL built first model airplane back 1920s Bill edifies us after 30 years Air Corps/Air Force another 10 years doingthings government heart problem came back modeling After building Sig Kadet bitten RC bug since have built several airplanes mostly scratch Being too old hands knees bit fueling starting airplanes put folding legs huge field box raise level permitted work standing position course field box/stand weighed much took two us move After building some plant stands PVC plastic pipe wife realized could have light field stand could handle easily comfort several months now have using stand shown enclosed photographs Built 1-in PVC pipe consists two ends two shelves supports airplane fastened ends bolts wing nuts permitting quicikly change fit different fuselages padding fuselage supports insulation sold PVC pipes 1 22 Model Aviation Plane Talk/Winter Continued page 37 two shelves simply two straight pipes held together sheet hardboard shelves ends joined spring clips shown pictures whole thing disassembles quickly fit car trunks room spare usually leave assembled carry airplane van Once decided sizes wanted figured out parts list construction took less hour expenditure less $10 field stand doubles great work stand shop stand problem solved turned problem equipment carried old field box Using scrap plywood built three boxes fueling box carries half-gallon plastic fuel tank 12-volt battery electric fuel pump starter box includes 12-volt battery power panel storage space glow plugs small tools electric starter tool box has drawer small tools parts storage compartments spare propellers larger tools equip ment cleaning equipment other essential items seldom needed put cleats ends bottom box fit over shelves keep boxes vibrating off shelf boxes quite light easily handled two 12-volt batteries provide back up prevent loss flying session forget charge Add folding chair jug coffee iced tea depending upon tempera ture have makings com fortable enjoyable flying session know youngsters will sneer such sissy stuff thought would pass along whatever worth hope will interest some other old-timers senior citizens seem coming RC hobby simplifi cation equipment might ensure sustained interest pleasant flying field conditions Thus spake Bill Greenhalgh Wetump ka AL Favor requested Will something cause close heart February 1986 ModelAirplane News Hal deBolt began new long-needed feature Golden Age RC has making long time us have put heads together help make possible always wanted self colunm specifically RC have interest Antique OldTimer modeling SAM Society Antique Modelers makes go Thats primarily based old Free Flight models RC-assist involved interest Old-Timer Control Line models obvious potential RC its own right has neglecteduntil now know 1950s 6-ft 35powered Smog Hog example does anything can Saturday Night Specialexcept go straight up Its easier safer fly things flown now came low-wing Smog Hog Sig Mfg Co perceived Kasmirski 45-powered Orion 1960 Aero batics World Champion still matches performance modern engine anything can think hot aerobatic airplane hundreds published once-kitted wonderful air planesdeltas canards name Ob viously an Antique era OldTimer era Nostalgic erastarting things like Goods Big Guff prewar days Taurus Orion 1960 Buzzard Bombshells could promote competitions aware majority will prefer simply enjoy flying historic planes Please contribute Hals column us hundreds pictures out Send background info Harold deBolt 2206 Greenwich Dr Kings Pt Sun City Center FL 33570 Without contributions column like deBolts cannot continued indefi nitely Photographic examples particular needed Falcon OldTimer dating late SOs Beams Esquires H-Rays Berkeleys Hollinger J 3 Fairchild PT on Walt Goods series history Radio Control began last month Chet Lanzo has asked help major presentation 1934 RC-1 prehistoric radio gear People keep building Krackerjac Rookie designers have same experience Beyond historic stuff now appearing magazine no continuity except deBolts Golden Age thing requires everyone interested assure prospers pictures good information Mining gold depends have gratitude joining effort Before long youll have yourself thank having bothered Bill Winter 4432 Altura Ct Fajifax VA 22030 Radio Technique/Myers Continued page 38 buy products object will likely accompanied warning literature manufacturer will receptive constructive criticism object being sold lacks such obvious liability/litigation potential manufacturers interest usually concen trates itself price profit performed static structural load test airplanes towhook/fuselage/wing combination Jugs water provided test load pint water weighs pound Note done before wing covered wing should depend covering strength sides something cracks want see well hear wing spar strong enough Only dowel needed changed Continued page 126 April 1986 123 C C El I m z 0 z z C 0 0 m I m 0 q 0 CD C 0 0 C -4 0 CD 0 Co U 0 -L N 0 0 01 x x N
Edition: Model Aviation - 1986/04
Page Numbers: 30, 31, 32, 33, 34, 36, 37, 122, 123
Bill Winter _____T12ILX E1Z0 0 Plane Talk Left Leading off Al Backstroms tailless fantasies Hoffman Wing follow-up Arup remember Smilin Jack comic strip Hoffman chief engineer Very stable model manyflights rubber now perks CO-2 Configuration less sensitive CG shifts conventional planes Tips ailerons Winter drawing large possible RC Right all-sheet Waterman Aerobile taughtAl iittl@ because always flew well Did 4Osec indoors its third flight now worn out flying ceiling hits Al has bigger built-up glow version Winterthinks RCM published RC Full-size plane Guggenheim Safety Plane competition 30s Above Lipplach Delta precursor postwar delta fighters High aspect ratio makes model extremely hard adjust Large props OK pusher tractor version Delta II would tolerate power burstof a4-in prop Both flew notwell Buildercon alders flops Right Backatroms model own successful full-scale plank Best flier series does 60 sec Cat site Left tractor stick isa tailless version Dr Lippiachs semi-ground-effect machine has flown several times never ROW Intended Right Backatroms neat Peanut Nicuport 11 Nowlen Aero kit experimental jobs displays nifty work manship nonetheless Nieuport consistently turns pretty flights though long duration Backatrom would like 30 Model Aviation L1JiJ~ FIG NOTE Long short wing versions FIG C 11 III / I/ Final version Backstroms pusher-engined plank has 110 flIght hours Insert side view tip fin isa drag rudderwhich hinges outward Dick Johnsons engine concept 16- 20-hp twin belt-driven countershaft top-mounted prop larger side view shows reflex alrfoli pusher props thrust line I Future possIbilities could include twin having delta-shaped center section area profile sketch shows airfoils thrust lines As planned two Johnsons twin-cylinder engines would used turning singie-biaded Evereil propellers TWILIGHT ZONE Lincoln Beachey glamour pilot early century said Give barn door Twill fly Al Backstrom would horrified being compared immortal Beachey indeed quite mortalgoing out boots thrilling multitudes San Francisco Golden Gate Exposition 1915 Al designs flies full-scale planks Planks go way back notably Europe Backstroms addiction finicky birds both gliders powered has found attention home-builders long involvement fringe-stuff models similarly reflects lifetime fascination gliders tailless aircraft Whats plank As see drawings plank usually paralleledged wing tailless generally assumed have no sweep heavily reflexed airfoil makes stable Well concentrate full-scale work Backstrom friends Backstrom finds No-Cal rubber-pow ered quickies especially useful look bit rough dont fooled include Nieuport 11 Peanut show capability modeling approach no fuss no feathers modeling inspired Air Trails late 30s AT covers things like Zanonia Bowlus sailplanes fired imagination articles about Northrop wings other novelties such Waterman Arrowbile convinced him such designs would fly models During epic interruption NW II became first student proposed gliding school shootingwas overthatfallofl945but EPB-iC 1965FiG D Al Cleaves 1965 modifications Backstroms 1954 EPB-1 glider uses center fin/rudder Winter says guestimating sport model hed expect CG close 15% chord hed use 5 dihedrai three-channel version 3 ailerons used modei would probably need aft vertical area especially ailerons April 1986 31 sent Pacific 1946 drifted joining Northrops engineering school 1947 saw flights huge Northrop XB-49 jet-powered bomber flying wing 1948 Chance-Vought produced Cutlass standard Navy carrier jet fighter swept-wing tail less 1950 enrolled Aero Engineering Department Mississippi State junior senior years specialized studies tailless craft Vought worked prototype Regulus cruise-type mis sile along way acquiring share Bowlusand earning commercial glider rating last two-digit US Silver Badge Soaring Mississippi studies concluded plank config uration best try Mississippi State place days Al came under influence Gus Raspet formed lifetime associa tion avid modeler full-scale flier Dick Johnson knew Gus inquisitive genius sat him basement Long Island home cigar box small hole side Hed blow cigarette smoke box close lid gently tap far side box Lovely expanding smoke rings traveled like procession ghosts across room What doing Search blowing smoke probably Mississippi commercial aircraft makers embarrassed superb performance Wittmans Tailwind Gus obtained plane Wittman took off prop covered thing tufts show airflow towed make studies experimented blown wings kind fan wing powered separate power source believe approach power plant failed giving fatal case asym metric lift Gus fine sailplane pilot Back Vought early SOs Backstrom doodled 36-ft plank aspect ratio 9-plus profile test model flew well enough demonstrate soaring potential impressed associates said Lets build 1954 26-ft 5in EPB-1 flying 1 956the ship good enough students few solo hours fly well famous pilots like Paul MacCready Gossamer fame Dick Schreder Paul Bickle Ted Jancrarek developed aerobatic routines flew air shows plank Building powered version done Van White director Experimental Aircraft Assn Dick Johnson engine genius Plans sold least several EPB-1As showed up beginning Suffice say comprehensive article appearead Bungee Cord summer 1981 issue various powered variations theme published SportAviation February 1976 February 1980 latter included full-color center spread Having unmercifully meat-axed vast material hoped nevertheless drawings will tickle fancy inspire daring create good-flying conversa tion pieces should fun Radio Control would dare say keep under control Wing loading tease have thing about wing loadings business dividing gross weight ounces square feet area Example 72 oz divided 4 sq ft equals 18 oz per sq ft loading Since little planes flit bigger ones fly nicely assumption best wing loading across board valid increas ingly useless wide variations scale things Ive wished print pundits would plot handy way us pinpoint realistic wing loading match designs think weights Jim Walkers Sonic Control Glider held Jim appeared 1954 Air Trails Annual flight photo showed Jim biowing through big party-type horn piane guidance subject mooing cows things sharing frequency Structural shot right emphasizes loveiy iines slmpiicity Note gussets used today Giant Scaic Jim found covering loose wouldnt act like drum 32 Model Aviation ~reate own oia-timerr JCTT Mcammant Cioud Nine original CA Special Enya powered three channels 4 lb 58-in span Finish Koverall Sig dope old-style 29 square Intake cost him 810 guy didnt like Jeff does snaps fun stuff under SOft Features lifting tail big ventral fin knock-off gear downthrust rock-back dihedral centerline front dowel stringered top oh big windows Finding field boxes heavy enough get banned some hIgnwa uruunnuiun devised stand lightweight 1-in PVC pipe Disassembles quit V Ig Tint car trunks its often transported plane place van Various easy-to-carry support boxes used required round out setup Plc right shows spring clips holding sembly together Plane left plc may Big Bird featured RCM some years back sizes suspect missing link ABC stuff aerodynamicist Two readers make interesting remarks pique hackers curiosity Like great majority cant bothered would know digest available material fiddle pocket calcu lator Thats reason think ing nice would someone caine up useful curves could pinned shop wall Roy Strader teethed ROGs 1929 Now Rubber Scale Old-Timers Antiques offers .. just rambling resume some items have thinking about discussing About some differences per formance size reduced increased think forget wing craft three-dimensional item wing dimensions doubled volume increased eight-fold makes quite difference volume air wing displaces course reducing wing dimensions has same effect other direction foregoing does explain what happens wing dimensions changed dont know details changes least before changes made OK think two-dimensional good enough everyday flying threedimensional Cube square exact Does Roy mean aspect ratio changing wing dimensions goes item called span loading Au referred span loading too pounds sup ported perfoot span ounces per inch foot fyou fiddle tiny models craft some designers seem ignore both design models fullscale aircraft Piper started trend Pacer its low aspect-ratio wing suppose interests cost andweight Some EAAers go same route designs seem surprised performance increase add couple feet wings span Well course EAAers add span increase aspect ratio wing area thereby also reduce wing loading Roys point aspect ratio know dont want high-drag 5-to-i wing championship Sailplane Piper may have other thoughts well Pacer older Pipers prior chubby Vagabond followed Pacer TnPacer long-winged Piper arrived cleaned-up Super Cruiser cowled Cubs became necessary truly slow up approach holding nose highfuse lage parallel horizonto increase sink rate could overshoot pretty long runway ground effect Flaps appeared later Super Cruisers Pacer landed like real airplane say settled solidly did float like J-3s T-Crafts bumpy days highaspect jobs gave rough ride whereas low-aspect Pacer TnPacer et al smoothed things out comparison higher span loading loose similarity model ing would Monarch Kadet Strader has valid points Now meet Jeff McCammant editor Marshailtown RCers Flyer extro verted ancient born dissenter comes like Midwestern tornado RC four years has several thousand words wild fun stuff first nocent paragraph has compass spinning like Cox 010which say about 30000 rpm Wing loadings wing loadings gins scaling up down Well happened upon enlightening article Ron St Jean says incorrectly considering relationship scale up down air holds wing aloft scale-up square Two dimensional Yet atmosphere three-dimensional cube Basically St Jean says consider wing loading consider loading per cubic inch volume wing occupies send copy Judge yourself think awe-inspiring especially look charts speak truth article St Jean blank now although editor appeared August 1959 MAN Free Flighters know St Jean famous Ramrod FF also MAN Ron cool cat just lately developed Nordics latemodel FFs using simple composites frameless flying surfaces light strong Rons Wing Loading Three-Dimen sional article major feature graphs demonstrate dramatically precision three-dimensional wing loading applies sizes weights models two four charts will see some pundit did provide 1959 curve always wanted Perhaps can ask MAN make Xerox copies pages 22 23 41 44 two additional pages back book material page numbers appear McCammants copies urge MANs editor republish sig nificant report subject universal important RC ironic twist wondered about charting wing loading curve values increasing scale Continued page 34 tables two four appeared August1959 issue ModeIAiiplane News article Ron St Jean entitled Wing Load ing Three Dimensional Ramrod Free Flight model numbers indicate wing areas sizes having similar glides Fig 1 shows great variations loading according traditional two-dimensional calculations Fig 2 shows almost identical loadings figured three dimensionally Winterfeels material significant designers including RC foraccurate relationships scaling up down April 1986 33 Like CAP 21 lathe stab prove validity flying wings Bill Evans uses elevons rudder control full aerobatics pattern 72-In bird 05 61 Capacitive Discharge Ignition CH Electronics Breakerless CD Ignition System can installed engine 15 large chainsaw type new 90 15 twa four stroke engines perfect far converting CH Ignition system new kits plans airplanes just becoming available perfect size engine Four stroke engines beautiful ign Detonation death four stroke enginewhen control engine timing can stop detonation makes engine run much cooler & develops power-plus no kickback 8 very low idle CH system used engine expertsMaynard Hill George Aidridge Doran Hiatt Cliff Bennett Otto Bernhart Maynard Hill used CH system last two world records Available two four stroke engines single twin cylinder Throttle Coupled Spark Advance kits available far popular engines Custom engine set-up available Call write price quote Now fETC electronic timing control information brochure price list send $1 00 CH Electronics Inc MODEL MOTOR MUGTM high quality totally glazed ceramic engine mug must modeler Standing 51/ inches tall large 10 oz capacity its real attention getter definite collectors piece years come OnlyPlus $200 postage $695and handling per order CA residents add sales tax Box 1732 Riverton WY 82501 Phone 307-8576897 REPLACEMENT PARTS FOR Kraft Engines Thator/ McCoy TaIpan 40 RJL ENGINES Call Only Factory Source RJL INDUSTRIES Free Parts Catalog Available increased looking right-hand column Fig 2 wing loading terms oz/cu ft value increases note cube square appear fall straight line curve think will quit am still behind Said St Jean mewhat surprised find recent years As could did glide well C jobs come wondered What happened Reynolds Number repealed small engines become much hotter size larger engines did fact old wing loading rule abolished have something check out latter possibility Ron continued computed wing loadings Ramrod fleet coming up information Fig 1 As can seen tables very definite progression evident small models having much lower wing loading large ones yet glides sinking speeds dif ferent-sized Ramrods pretty much same felt found answer certainly didnt understand until day hit us like bolt years have thinking wing loading terms much per square something other wing two-dimensional thing threedimensional loading should figured volume area basis has chord span thickness well test hypothesis quickly checked out calculating wing loading much per cubic inch rather square inch make measure wing volume first determined actual rib area typical Ramrod wing section divided chord area value order arrive measure average thickness Multiplying average thickness particular wing its area would produce volume cubic inches As shown table dividing weight ounces figure gives us threedimensional cubic wing loading ounces per cubic inch various-sized Ramrods Fig 2 As can seen table cubic wing loading almost identical through various sizes since models have addition equivalent gliding ability statement principle seems order scaling design different size retain same glide wing volume should made directly proportional weight Au Italics since dealing same design can make weight propor tional cube span 3/2 power area square root area cubed results same important thing being put measure wing three-dimensional terms now apparent us figuring wing loading ounces per square foot square inch useful measure Continued page 36 34 Model Aviation r RIL Industries ox 5654 dena CA 91107 Phone 818 359-0016 iLJL1 L LLL 13311 Beach Ave na Del Rey CA 1J 1-624 0@00000so@oso@o@o@o@o@o@O L VIDEO 0 HOBBY RETAILERSS Answer YesI 0 4 ESPONSE YOUR OVERWELMING0 DEMANDS WE NOW HAVE SOLID DEALERQ PLAN EXCLUSIVELY FOR YOUI YOU CAN NOW RENT OR 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Saves Models BATT-CHEK RX-1 $1495 n USA NEW Install RC Models Check receiver battery status press button Small Light 1/2 oz Precise Rugged ORDER TODAY dealer Protune Corp 1914 462-6452 PO Box 1808 Poughkeepsie NY 12601 TARBaby Especially Turn-around 850 sq 120 4 cycle powered Ron Chidgey design smooth solid performer Rib templates computer plotted Plans construc tion hints- $1195 TRANSMITTER CASE An inespensive rugged molded case protect expensive transmitter both two stick single stick transmitters Brown leather grain aluminum trim locking clasp $1895 WING TUBE & SOCKETSNEW WING MOUNTING SET Aluminum alloy tubing plug-inA wing mounting system developed Ron Chidgey wings Included pair ofthat fast neat accurate stays tight Three special slip fit phenolic socketsnylon brackets screws machined wing blocks build wing structureincluded -$695 Now size models 718 dia s 2 $ 8g5 1 dies 2$ gg 1 dia x3 -$1495 P Gator RIO Products 3713 Pompano Dr See Dealer Order Direct Pensacola FL 32514for UPS Phone AC 904 476-8639Include $150 Per Item TORK-STARTER revolutionary concept power iSV glow plugs model cars boats air plenes using glow fuel engines TORK-STARTERITMI has steel wrench strong W enough reduce compression easier starting supplies power doing comes new CuD charger has LED indicate nhe unit charging also has removable T handle can used Torque amplIfier Over 50 consecutive starts full charge rechargeable hundreds times Clips onto plug positive connection Send ad along prepayment receive MFG OF NI-STARTER free shipping handling TORK-STARTER T$2995 Charger NOV 22tV 12V Fast Chartvrl $2995 $2095 Without Charger Charger CHARGERS PLEASE SPECIFY WHICH CHARGER 95 Charger Only WHEN ORDERINGII tOy 220V 12V Fast Chargtrl 12421 Ransom Dr. Glenn Dale MD 20769301 464-2260 comparison between models almost same sizes con sidered real fallacy making wing loading comparisons area basis co-mingling oranges apples speak weight three-dimensional area two-dimensional direct comparison need express terms other will same dimension whether two three Poor Jeff McCanimant writes wonderful letter talk about St Jean Third Dimension Saying modeler since day born beats proud designing own stuff ant-eating own parts building flying alone really blooming extrovert Heres what said about training Being. way am rejected normal way learning fly RC popular way accepted around 40-powered four-channel trainer first differently wanted Sailplane Jeff declares So got Sig Riser Rider put power pod Thats revolutionary No other way fly start engine radio toss climb play land feet again Theres no running get 900-ft highstart line no tow hooks etc taught myself fly Never instructor Now three years later club has people fly Gliders power pods started almost nobody thought flying Gliders Glider gives plenty reaction time Jeff makes sense too am block headed Listen up quiet airstrip Doug Pratt flying simultane ously now Kracketjac new Rookie pennants drooped tennas soft Bahamian air two Enya four-strokes purred quietly impacting dream-world environment yellow low-winger red cabin ship against deep blue sky eight minutes both planes trimmed hands off switched transmitters What rare experience fly two own planes flight different As sun sank beginner never taken off landed himseW appeared RCM 40 knocking knees Doug took oft flew superbly low-key support talk reassuring him fast nicely-banked approaches did flawlessly mentioned flown Gentle Lady didnt count leftright days behind him Thats giant first step Doug said after learned fly MRC Chipmunk Doug years ago snap rolling second flight too flown Gentle Lady same quirk young beginner friends didnt count What Ive talked truly hot-start beginners given truth serum confess good times Gentle Lady others like find myself perplexed strangers ask about getting started usually no help want anything better knowing resistance real primary trainers some stigma cross mental fingers suggest Gentle Lady does have say something power training such models climb slowly mope along good podmounted 049 myself Id put engine nose Its good plane beginning Electrics too Start popular 05 electric motors six 12 Ah Sanyo cells later may want try SR batteries other props cells folders cobalt motors reduction drives etc keep start simple going swallow tub-thumping jargon argot insist fast 40powered animal four channels little forgiveness thats fine sellers accessories include certified instructor great communicator under stands children work living youll have wait instructor busy Sunday good guys similarly desperate fly youll wallflower fruitless Sundays ticking away like taxi meterif active site busy club However learn solo yourself path easier have flown form model past wont let fly site until youve demonstrated proper solo flight Few instructors able willing give feel flight itself understand inner nature little beasts begin Glider select kit shows rigging power pod Thrust lines important example nose-mounted glow engine electric mo tor will require downthrust model will stall easily under power spells sloppy flight floundering con trol under power airspeed higher design speed Glider producing excess lift downthrust counteracts excess lift nose-mounted power source will need least 20 down maybe 40 50 pod engine motor high above both center gravity center drag has effect similar downthrust may enough paraphrase Will Rogers said never met man didnt like never met field box 1 did like Life simple doorbell battery Pandoras shoebox jug wine gas/oil 5% glow thou airplane 1950 guy named Broadfield discovered later have big manufacturer balsa gliders ROGs during 20s appeared Long Island field field box detachable legs man didnt come down trees got off knees standup starting two U-shaped saddle pieces inserted hold model days box standing crosswind light 6-ft cabin ship top often blew over after-shock splintering noises ol boy gifted bunch us boxes cried foul bills arrived Can imagine gall Seven bucks came starters wet cells glow Continued page 122 Youli Soar Unimagined Heights Now can build paper airplanes fly high far masters Paper Airplane Book official book Second Great International Paper Airplane Contest Youll get tips winners blueprints prize winning designs instructions build own high-flying planes Learn Secrets Japanese Air Superiority reason Japanese hold paper airplane records paper use Its never available count. until now including enough sheets exclusive paper make several models own Prepared editors Science 86 Paper Airplane Book beautifully designed high-quality photography winning entries Second Great International Paper Airplane Contest Its perfect gift paper pilots ages Special Offer Science 86 Through special arrangement Random House Science 86 now accepting orders PaperAirplane Book just $895 order copies just fill coupon below mail us check money order Please send mecopies PaperAirplane Book $895 plus $175 postage handling Mail tO Science 86 Airplane Book PO Box 10982 'DesMoines Iowa 50340 Total amount order $________ D Enclosed check money order made payable Science 86 Eli Please charge my[]Visa MasterCard rn Date Siomt,rp Address City State 7in Please allow 46 weeks delivery Outside U5Aadd $250 PAB-MA486 April 1986 37 PILOTS TS RIOR TS T THE MOST SUPERIOR PILOT FIGURE ON THE MARKET LIGHTEST WEIGHT MOST REALISTIC AVAILABLE GIVE YOUR PLANE PILOT FOR YOUR NEWEST OLDEST OR NEXT CREATION R YOURS TODAY FULL FIGURES CIVILIANWWII MILITARY 1/3 Scale $19951/5 Navy $1395 1/4 Scale14951/6AAF1195 1 /5 Scale1295 Plus 1/12 Scale895$250 shipping 1/12 Chopper 895each figure KNIGHTS OF THE AIR 1400 Rte 22 West Friendship MD 21794 301-489-5050 Letters Editor Continued page 12 compiling error having gone undetected long quantity E1115/61 usually much smaller quantity L*S2/Sl As such little error pro duced used probably noticed attributed geometric variations actual model Mr Donatelli found error may have used design di mensions producing severe imbab ance So Line 760 should read PL*S2/SlE1/15/Gl apologies error must lot modelers out computers already getting mail about article Design Analysis Program Dick Sarpolus Shrewsbury NJ Safety Preston Continued page 20 stated experiencing prob lems some parts country RC cars buggies using frequencies reserved aircraft. Perhaps Davids label suggestion can help alleviate some problems FlutterAnother item mentioned last months Safety column suggestion modeler should man datory checks models prevent con trol surface flutter November 1985 issue Corsair newsletter Joint Military R/G Fliers Club editor Marlin Kinning article flutter written noted modeler Cliff Weirick benefit readers may know what flutter can model Im reproducing Cliffs article FLUTTER Most know what seem some fliers dontor dont care break flutter down two levels full blown FLUTTER very destructive force second BUZZ Buzz too very destructive force slightly dif ferent way Lets look FLUTTER first can destroy airplane quicker can blink eye can attack sur face plane its prime targets ailerons followed closely elevator rudder flutter starts matter time until surface itself leaves plane takes sur face attached case two wings elevator counts up three airplanes stunt job wing failure next two Formula Ones Another aileron wing other elevator Actu ally very famousor should say infamouscrash lot oldtimers will remember Nats Los Alamitos NAS Boy what mess Now know what flutter can lets think about BUZZ hard describe because cant hear power model unless engine dead can hear flutter loud est engines whining away Buzz tends destroy servosand ultimately plane tends ruin gears worse yet attacks feedback pot ser vo does wearing small area usually around level-flight neutral position happens wonder sometimes controls may act funny What causes buzz Primarily two things Loose control surfaces sloppy tail-heavy loose sloppy pushrods etc see control surfaces look ready fall off airplane yet pilots ignore Same way pushrods Some builders drill %2-in holes control horn use 46-in wire Thats really asking sum up check things time go out fly remem ber tight will wear out get loose Have safe moath John Preston 12235 Tildenwood Dr Rockville MD 20852 responding advertisers mention read aboutthem ModelAviation drivers fuel pumps rolled aisles over power panels gallon fuel cans transmitter tray must got hand-held units Field boxes heavy wacky high-techand prop can cost seven bucks about power panel under nose run engines fancy hinged lids prevent getting anything plane figure top wedding cake ends up ground crawling aroundeasier get ting up down like jive puppet Im back knees now cant get up Legs no legs question Bill H Greenhalgh man after own heart dont have ambition brains too suffering herd guy lives place called Wetumpka Alabama must have right stuff am another old coot Au Good name next modeL built first model airplane back 1920s Bill edifies us after 30 years Air Corps/Air Force another 10 years doingthings government heart problem came back modeling After building Sig Kadet bitten RC bug since have built several airplanes mostly scratch Being too old hands knees bit fueling starting airplanes put folding legs huge field box raise level permitted work standing position course field box/stand weighed much took two us move After building some plant stands PVC plastic pipe wife realized could have light field stand could handle easily comfort several months now have using stand shown enclosed photographs Built 1-in PVC pipe consists two ends two shelves supports airplane fastened ends bolts wing nuts permitting quicikly change fit different fuselages padding fuselage supports insulation sold PVC pipes 1 22 Model Aviation Plane Talk/Winter Continued page 37 two shelves simply two straight pipes held together sheet hardboard shelves ends joined spring clips shown pictures whole thing disassembles quickly fit car trunks room spare usually leave assembled carry airplane van Once decided sizes wanted figured out parts list construction took less hour expenditure less $10 field stand doubles great work stand shop stand problem solved turned problem equipment carried old field box Using scrap plywood built three boxes fueling box carries half-gallon plastic fuel tank 12-volt battery electric fuel pump starter box includes 12-volt battery power panel storage space glow plugs small tools electric starter tool box has drawer small tools parts storage compartments spare propellers larger tools equip ment cleaning equipment other essential items seldom needed put cleats ends bottom box fit over shelves keep boxes vibrating off shelf boxes quite light easily handled two 12-volt batteries provide back up prevent loss flying session forget charge Add folding chair jug coffee iced tea depending upon tempera ture have makings com fortable enjoyable flying session know youngsters will sneer such sissy stuff thought would pass along whatever worth hope will interest some other old-timers senior citizens seem coming RC hobby simplifi cation equipment might ensure sustained interest pleasant flying field conditions Thus spake Bill Greenhalgh Wetump ka AL Favor requested Will something cause close heart February 1986 ModelAirplane News Hal deBolt began new long-needed feature Golden Age RC has making long time us have put heads together help make possible always wanted self colunm specifically RC have interest Antique OldTimer modeling SAM Society Antique Modelers makes go Thats primarily based old Free Flight models RC-assist involved interest Old-Timer Control Line models obvious potential RC its own right has neglecteduntil now know 1950s 6-ft 35powered Smog Hog example does anything can Saturday Night Specialexcept go straight up Its easier safer fly things flown now came low-wing Smog Hog Sig Mfg Co perceived Kasmirski 45-powered Orion 1960 Aero batics World Champion still matches performance modern engine anything can think hot aerobatic airplane hundreds published once-kitted wonderful air planesdeltas canards name Ob viously an Antique era OldTimer era Nostalgic erastarting things like Goods Big Guff prewar days Taurus Orion 1960 Buzzard Bombshells could promote competitions aware majority will prefer simply enjoy flying historic planes Please contribute Hals column us hundreds pictures out Send background info Harold deBolt 2206 Greenwich Dr Kings Pt Sun City Center FL 33570 Without contributions column like deBolts cannot continued indefi nitely Photographic examples particular needed Falcon OldTimer dating late SOs Beams Esquires H-Rays Berkeleys Hollinger J 3 Fairchild PT on Walt Goods series history Radio Control began last month Chet Lanzo has asked help major presentation 1934 RC-1 prehistoric radio gear People keep building Krackerjac Rookie designers have same experience Beyond historic stuff now appearing magazine no continuity except deBolts Golden Age thing requires everyone interested assure prospers pictures good information Mining gold depends have gratitude joining effort Before long youll have yourself thank having bothered Bill Winter 4432 Altura Ct Fajifax VA 22030 Radio Technique/Myers Continued page 38 buy products object will likely accompanied warning literature manufacturer will receptive constructive criticism object being sold lacks such obvious liability/litigation potential manufacturers interest usually concen trates itself price profit performed static structural load test airplanes towhook/fuselage/wing combination Jugs water provided test load pint water weighs pound Note done before wing covered wing should depend covering strength sides something cracks want see well hear wing spar strong enough Only dowel needed changed Continued page 126 April 1986 123 C C El I m z 0 z z C 0 0 m I m 0 q 0 CD C 0 0 C -4 0 CD 0 Co U 0 -L N 0 0 01 x x N