THE ULTIMATE Sailpianers art felt craft made modem all-glass technology completely formed molds Fi berglass fuselages have long made manner all-glass ship has molded wings tail surfaces well top F3B planes such built flown World Champions Rolf Decker Reinhard Liese made way Some commercially made Sailplanes like Rowings Impuls Fiberglasfiugels Albatross some big Scale Sallplanes like Roke DG 202 made molded glass too surpris ingly planes named made Germany Europeans have leaders technologyboth full-size Sailplanes models US needs catch up molded glass technology reason feel very fortunate have received step-by-step explanation molding glass expert Martin Bamert Martin Swiss citizen living temporarily Cal ifornia Martin sent written description molding included set 54 photos showing step process also sent samples wing stab sections molded carbon fiber ac cessory parts 23 pictures finished Glider named Speedo 87 plane de signed built Martin partner Jurg Wermuth lives Switzerland spection samples photographs Id say work Martin Jurg equal best being done today Truly ultimate modelers art Martins name sounds familiar may re call Dan Pruss article Slope flying Swiss Alps appeared May 1984 issue Model Aviation Dan told about traveling ca ble car up high mountain ski resort Swiss Sailplaners take over summer combi nation beautiful Scale Sailplanes /z- /3-scale combined gorgeous Alpine scen ery unforgettable Its ideal place slope fly Dan included several photos Martin flying own-design DG-100 428-meter span report Dans captions reads Martin Bainert considered best Switzerland free styles crowd Notice other Sailplanes parked Martin does thing Dans January 1985 RC Soaring column also photos Martin /3-scale DG-200 50-meter span Unfortunately isnt room column make complete showing Martins step-bystep construction photosbut have given few next best thing print pretty much Martins written descriptioneven cant see pictures Incidentally Martin sald spent 700 hours making molds alone Speedo 87 aerobatic Slope Racer discusses letter uses wing twisting roll control wings rotate slightly around wing joiner rod instead using alle rons roll plane Without further ado Martins letter report am going talk about two Gliders the Speedo 86 Speedo 87 Speedo 86 actually designed 1984 Jurg Wermuth friend Switzerland About three years ago Jurg sold two fuseHeres some process Martin Bamert uses produce molded Saliplanes First L aluminum framework surounds left wing master plug preparatory pouring first half mold L Object right another wing master plug resting atop finished half mold Com pleted wing mold R master form inside Big machine screws used jack mold halves apart theyre heavyl R&G Kunsttoff Tech nologie Swiss company supplies materiels Martin needed glass molding Theres lots information column Heres pair molded wing panels about born L Still encased molds see root-end wing L tip-end other R Roll control uses twist-wing method instead ailerons Wing panels pivot 8mm steel joiner rod Photo right shows Mar tin using spatula technique make stabilizer master mold visible 3-ft-long steel rod fastened top end work table attached end scraper maintains constant radius scraper drawn forward Stab mold plastic material 50 Model Aviation Radio Conoi Soaring Byron Blakeslee 3134 N Whrnebago Dr Sedalla CO 80135 lages valuable hints built two models Building model like ex actly easy task Because its small span 78 whole model has built very accu rately order achieve acceptable level performance glass fuselage white gel coat reinforced plenty carbon fiber Kevlar wing built foanilglass sheeted obechi wood glass cloth laid diagonally over foam cores increased torsional strength very important high-speed flights uses JW airfoil designed Jurg 10% thick slightly undercambered approaching trailing edge rudder well stabilizers sanded out piece balsawood Stab airfoil roughly NACA 0006 fully symmetrical Wing stabs rudder covered white polyester iron-on film gives model its final touch RC controls twist wings plus elevator rudder Building controls created some problems because space very limited fuselage though love working tweezers finally happy have completed installing three servos re cesver batteries first flights overwhelmed expecta tions flew slight upwind lightest Gliders fighting stay air wing loading 151 oz per sq ft quite accomplishment model also re sponded very well thermals easily climbed heights difficulty recognizing Speedo 86 completely aerobatic its element diving 600 800 ft straight down Nothing raffles shakes behaves stably predictably during high-speed flights Most kinetic energy can converted back height model has clocked over 100 mph have flown Speedo 86 over 120 hours have never crashed slope take results its attracting curious quisitive model pilots Conrjd page 135 New Fourmost Fillet QUICKCLEANEASY Stop messing around gummy fillers sticky putties Use Fourmost Fillet get clean perfect contour hassle Fourmost Fillet continuous strip vinyl preformed make perfect fillet Fillet may easily installed cyanoacrylate adhesives can finished either paint iron-on materials Fourmost Fillet also perfect wing saddle seats 2 sizes small No 128 medium No 129 Price 4 feet $350 Fourmost Products 4040 24th Ave Forest Grove OR 97116 503 357-2732 Carry Largest Only Stock Kraft Parts World .. Kraft alive working KRAFT MIDWEST Authorized warranty service ILL FLY WHAT FIX FREDUENCY CONVERSION $1000 Discount Regular Reparr Moot Make end Modete Converted Tuning Done Spectrum Analyzer Atso Service AU E/ 1iiiihi] Shad Only Full Time Servicenter Midwest ~W117 East Main St Northville Michigan 48167 Upper Lert IPhone 1-313-348-0085 Viee Meeterd Welcome r NE Vi f makers HEAD LOCK HEADLITE tm Features 1 STAINLESS STEEL HEAD LOCK tm glow plug connectoj strength corrosion free life 2FIELD REPLACEABLE 1 2 AH Nicad 3Built FULLY AUTOMATIC ON/OFF SWITCHto prevent short circuits pocket tool box 4LEO INDICATED charger available I-EAD-LLL. rri~$1695 FEAD-LITE m W/GHARGER-$2595 aeatable write direct add St 0045200 outse lSt MODEL PRODUCTS CORP PO BOX 100 ALLAMIJCHY NEW JERSEY 07820 September 1988 51 Molds used make Speedo 87 Slope Racer seen Above being sup ported designers/builders Jurg Wermuth L Martin Bamert MB initials tin Scene Swiss Alps Speedo 87 uses Multiplex Royal radio Below Rear servo drives pivoting wings short connecting rods Martin says plane will easily reach 150 mph dive Sorry say designers de cided model will sold/kitted US Pat4221452 os Pn RC Scale/Wischers Continued page 49 Consolidated Catalina both well-kept condition Two Royal Navy types also part show Fairey Swordfish early WV U vin tage flag-flying crew standing erect rear cockpit latest model Sea Harrier ar rived RNAS Yeovilton demonstrate slow hovering flight well high-speed passes time cover ears Another US product Fairchild A-b Thunderbolt II also known affectionately Warthog demonstrated extreme maneuverability its split ailerons able perform quite air show within small airports boundaries competition aerobatics enthusiasts flight routine one-of-a-kind Cran field A-i intended international aero batic contests design originated Cranfield College Industrial Technology Model flying United Kingdom trip visited three model flying sites first Tempsford disused WW II air base Only short length runway remains sur rounding farmland preserved RC model flying lady owns land also preserved another reason An old barn field national shrine base Westland Lysanders departed cross-Channel flights carrying supplies daring patriots supply continental underground operations dur ing WW II shown example RC flying management large club painted di visions pavement indicate model flier must stand avoid interference prob lems obligatory stand space flight also engine startup other activity tranamitter turned fellows extremely cautious about hazard radio interference Except feature could have watching sport flights right home four-stroke revolution has taken hold also few days later visited Chris Bradford Scale modeler flies both Control Line RC Marlborough flew Sopwith Pup typical grass field edge town powered English Laser four-stroke en gine Marlborough Model Hying Club has shelter house nearby also very smooth rugby field Control Line flying Laser quite impressive no nitro fuel will idie slow tick-over ac celerate full rpm hesitation Chris must impressed too has six Lasers both single-cylinder twins Chris Bradford also engine collector address 38 Barrow Close Marlborough Wiltshire 5N8 2BE Eng land has member UK World Championahip Scale teams 1984 1986 went westward visit James Pelly-Fry Scale modeler may remember published article Vickers Wellesley June 1988 issue Model Aviation new est Scale model deHavilland Devon twin ready fly test pilot Brian Taylor lives nearby local club smaller seem have no trouble interference flying site Merryfield little-used naval base 1-mile-long newly paved runway field has guard gate knows local modelers fly undisturbed end runway Another P-Si Information Bob Holman tells us Brian Taylors newest plan ready distribution Its P-51D Mustang designed 164 scale 60-size two-stroke 75/90 four-stroke engines Brian says no accurate scale drawing could found model built measurements photos Mustangs Imperial War Museum Dux ford England model weight just under 11 lb needed two ox tail ballast balance Adding tail weight Scale model rather rare occur rence used English Laser 75 four-stroke engine sufficient cooling chin air intake Exit air through scale exhaust pipes through fuselage radiator air outlet Span 69 An epoxy glass fuselage will available although drawing shows balsa construction An accessory package cludes detailed glass cowl hatch belly scoop canopy two drop tanks aluminum spin ner Bob Holman Plans PO Box 741 San Bernardino CA 92402 Paul Matt drawings Paul Joan Matt died last year concern among Scale modelers about what would become enor mous collection scale three-view drawings SunShine House Inc PO Box 2065 Terre Haute IN 47802 has acquired material Historical Aviation Album pub lished Paul Matt Included three- four-view scale drawings well last two Volumes 17 18 Historical Aviation Albums SunShine house has numerous books interest modelers Aviation Heritage Li brary series RC Soaring/Blakeslee Continued page 51 Surprised its great overall flight perform ance Jung decided join forces design Speedo 87 main reasons new de sign increase size times became problem recognlze correct position flying far away improve minor imper fections design utilize mod ern accurate building technology could accomplished employing molding tech nology using epoxy resins glass carbon Kevlar fibers Speedo 87 roughly 25% larger ample space inside fuselage cleaner flush wing-to-fuselage transition fiberglass sandwich glass-balsa-glass wing stabilator sections Because building molds very timeconsuming process Jung made fuselage mold did molds wings stabs special levers parts airfoil used RG 12A-18/90 18% camber 90% thick F3B airfoil designed Rudolf Girsberger Swiss model pilot stabs again used NACA 0006 airfoil order make wing molds first build positive formor master wing did covering foam cores prefabricated fiber glass skins skins epoxied cores clamped between two very accurate straight wooden blocks blocks look like 1 x 6 boards glued side-to-side form big butcher blocks six inches thick 18 wide five feet long have undoubtedly surfacemachined obtain flatness BB An obechi leading edge added sanded shape eight equally spaced stations made airfoil tem plates verili accuracy wing wings sprayed polyester surfacing maContinued page 139 Name Street Address City StateZip HoBD RNATIONAL INC September 1988 135 ZMA SECOND ANNUAL Memphis Belle Classic GIANT SCALE OCTOBER 15 & 16 1988FLY IN... SPONSORED BY THE MEMPHIS RADIO CONTROL CLUB MEMPHIS TN OAMA & IMAA SANCTIONED IMAA RULES WILL BE OBSERVED FOR FURTHER INFORMATION CALL RILL REATY EVENINGS 901-754-5083 DAYTIME 801780-7 180 MANLY WILLIAMS CD EVENINGS 9013881844 DAYTIME 9017812330 RC Soaring/Blakeslee Continued page 135 terial sanded eliminate imperfections Once master wings existed molding could proceed took place same wooden blocks originals pressed between wing placed within aluminum frame pieces covered gray molding resin Sorry can explain things very superficially otherwise would writing book top first coat thin glass layer added mixture resin quartz sand mechanically very stable material used fill frame addition two steel tubes fitted top frame hold mold together Once lower half mold existed upper half could built same way top lower part process done twice order come up molds both wings molds wing weigh about 120 lb finished molds polished treated separating agent white gel coat sprayed molds top glass cloth weighing 40 grams per sq meter added soaked epoxy resin 1/A balsawood skin put top soaked glass cloth setup placed polyethylene bag sealed vacuumed 24 hours After removal bag another layer glass cloth 120 grams per sq meter plus rein forcements put top balsa spars glued top lower sandwich wing subspars cut blue foam main spars consisted plywood carbon fibers Behind main spars place additional ballast weights main spar pretty involved because thickness air foil root 20mm dihedral built wing total dihedral 5 e edges carefully trimmed sharp knife wing halves glued together epoxy resin wing halves cant sanded prior gluing could dam age molds During gluing step molds securely clamped left leading-edgedownward epoxy would form nice fillet inside epoxy trailing edge thick ened wouldnt run down molds designed make wings span up 263 meters just cut ends off molded wing make required size experimenting different tip shapes though wing samples sent came ends first set have minor consistencies paint coverage can see what kind leading trailing edges well sur face quality can achieved using tech nology beauufulBB positive master form stabila tors done different way wings order achieve greater accuracy lead ing trailing edges spatula technique used much involved way building original return gives greatest possible accuracy current hightech F3B Gliders made way method starts very sturdy alumi num base plate exact length stab wing made end screwed air foil template exactly half airfoil show ing above base plate space between root tip airfoil templates base plate filled gray molding resin very straight rule resin dispersed within given space Starting trailing edge rule pulled forward toward leading edge drawing process repeated up 20 times amount resin scraped off decreases time root tip templates removed after resin cured aluminum frame bulit around base plate molding process pretty much same wings Since stabs symmetrical build upper lower section part Building actual stab done very much same fashion wing except balsawood used sandwich / thick mold fuselage explained before made friend Jurg mold rudder made exactly like stabs explained above cant explain exact malting fuselage mold Jurg has done job process commonly known anyway explain actual making fuselage top coat white gel coat polyes ter stinks terribly thin layer glass 40 gin per sq meter added before Kevlar cloth graphite fiber strands inserted Key lar about one-third lighter glass very difficult trim cut off carbon fibers added skinny tail sec tion fuselage absolute necessity high-speed flight model tends automati cally dive downward higher speeds reached stabilizers must exert downward force maintain level flight fuselage stiff enough will bend making control dif ficult make fuselage takes about eight hours Special parts Speedos made molded carbon fiber include stab crank lever incorporates two ball bearings wing joiner rod 8mm steel roller bearings ensure easy rotation wing panels first Speedo 87 models wings twisted small crank levers currently have gone directly driving leading edge pins Multiplex servo have used Multi plex Royal radio years am very satisfied really worried before maiden flight Speedo 87 after investing about 800 hours work worked project three months straight working regular job kind wonders what going hap pen flew beautifully major adjust ments After first few turns noticed its very stable uncritical flight behavior could barely stall did stall went smooth downward curve Its restitution ability convert speed height surprised because much better Speedo 86 very good itself Because its low-speed flying capabilities can take advantage smallest thermals updrafts its thin 9% airfoil also very fast Glider speeds up 150 mph easily reached Due its high penetration Speedo 87 also perfect aerobatics After about first two hours intensive fly ing could see easily outperformed its smaller brother Time after time Speedo 87 has admired amazed Glider pilots can say bragging pretty much outperforms Glider have ever flown owned within 17 years flying hope can see kind handcrafting involvement needed cant massproduce put realistic price tag model reasons Jurg have agreed sell Speedo 87 Thanks very much Martin Bamert tak ing time share important interest ing technology us hope descrip tion will encourage some Americans try du September 1988 139 plicate super-high-tech Sailpianes being made Europe F3B Britain recent issue Sean Walbanks White Sheet Club newsletter con tained very interesting article Bill Stephen Haley latest F3B design KB Merlin Stephen flew Merlin very creditable fourth place last years World Cham pionships Bill British ream manager came within few points repeating World Championsjust getting nipped wire Austrians Sean also edits Soaring column R/C Model World magazine well-known pursuing inside scoop model design ers Im sure Bill put arm him think youll enjoy story asked give story de velopment latest F3B model KB Merlin flown son Stephen fourth place 1987 World Champs West Germany first reaction far go back history Most competition model designers would proba bly agree good models normally devel oped over long period through series mod els model usually being modified version before no exception KB Merlin made some rather dras tic changes previous F3B models start Well feel obvious start ing point demise beloved Eppler 193 airfoil changing Quabeck section World Champs team trials expected take place late 1986 believe 193 finest all-around sections available Soaring fact placed fourth two pre vious team trials using section Having said time marches re alized although Thermal Distance tasks relatively easy 193 just fast enough modem international com petition mind built pair F3B mod els using Quabeck 210 section 2% camber 10% thick design span 116 straight-tapered nine-inch root seveninch tip chord models plug-on wings incorporating system using ballast tubes wing-joiner tubes %2-in ti tanium bar joiner effort try save weight decided eliminate spar using HT alloy tube spar reinforced carbon top bot tom wings covered epoxy/glass skins made sheet glass attached using ep oxy vacuum-bag system models corporated full-span flaperons operated two servos wing fact spar turned out far better theory practice crash 86 nation als split carbon-fibre away alloy tubes Stephens model later crash did same ie bond between tube carbon fiber wasnt good Per haps bad preparation tubes event never happy models al though definitely fast found banker event Duration task very much harder fact great difficulty thermaling properlythermal turns posing particular problems Having both European World Championships British team am con vinced British fliers best Thermal pi lots world dont have beat about bush Bill Tell us what thinkSW bad air lads will go looking lift hav ing found will work proven occasion Germany foreign fliers simply launched mod els sat wind hoped six min utes Enough prattle decided hold team trials May 87 rather Septem ber 1986 great lack success using Quabeck section felt another com plete rethink required com petitive time completed new fuse lage designed one-piece wing What wing section use started looking elusive worldbeater using very simple per formance criteria ie capable eight minutes flight average 24 laps Dis tance easy 16 seconds Speed timeall downdraughts Eventually came across Girsberger sections limited technical knowl edge decided RG 15 looked exactly what looking little naive thought discovered new wing section no else usinglittle did know outcome felt **it bust tlme either continue Quabeck section hope practice would make us competitive design build completely new models short time available hope flew off building board chose latter route Because felt either us successful getting British team would have time build spare models before World Championships July decided build two models trials large gamble failed perform no chance schedule programmed ensure least two models ready Christmas 86 would enable us get some practice incorporate modifications required other two models Once again theory proved better practiceand fact first ones completed month before team trialsnot enough time Wing construction again blue foam cores composite carbon-fibre spars time covered epoxy/glass skins applied wet plastic sheet still us ing vacuum-bag technique Ballast tubes incorporated wings access through small hatches wing top wing now one-piece except plug-on tips allow wings carried 10-ft model box plug-on tlps proved poor idea Controls ailerons rudder elevator trailing edge air brakes also incorporated arrester hook designed elec tronics expert Barry Mason springloaded rod projected straight down below cockpit actuated full rudder Barry fit ted pushbuttons onto transmitter gave us momentary full rudder release rod aimed wing loading 125 oz/sq ft planes fact turned out 135 oz/sq ft risk work worth Well af ter friend helped us CG use computer four models superb fly fact ways similar E193 ones have found Duration task rel atively easy achieve especially winch launches now getting about Distance task again very good feel need practice order improve As task has now altered man-on-man unlimited laps four minutes awful lot points can gained lost Much skill required now get best out model Distance Ballasting example now critical ever air speed has spot-on positioning course vital Lastly probably impor tant good teammates needed keep informed what other fliers ing task usually flown four group last task Speed KB Merlin fast Well Steve proved fastest fliers week Germany actually fast est days atrocious weather condi tions During practice before competition did run 165 seconds Simprops private fly ing field pretty obvious above delighted results efforts time published should well way 88 models leamed great deal 87 World Championships etc 140 Model Aviation MODELERS FIGHT-BACK TRUE-FACTS N EWSLETTER 444 Tired b ing ignorci editors Fed up wills never having questions answered FIGHT BAcIt Join us letter year s reader written publication spen letter communication between fellow modelers R$ fre flight 5 good thLsg iV TSonly wst Mississippi 2 Atvse limits models orflpiig sites 2 YhatLvfvrinsisrsisseiehst eye rktc IASstility toiecerd UIA Hhy AU LETTERS PUBUSI/AD $300 recieve sne copy $550 pub letter & copy $1950 4 issues & letters 1 yr Quarterly July OctJanApril THE PTERANODON PRESS 42 55 551 55 CA MASK CA glue works wonders building ntodels right Unfortunately gives enough fumes knock vulture off carcass modelers have suffered medical problems after inhaling CA fumes take chances special vapor respirator filters CA fumes soft face mask adjustable straps comfortably fits face sizes easy breathing valve allows prolonged use providing dependable filtering concentrations up 1000 PPM though rugged industrial mask light weight elimi nate fatigue Dont get gassed CA Get protected Order CA Mask today Just $1247 shipping cheaper hospital visit Money order Master Charge Visa include expiration date check allow 20 days clear Sorry no CODs Pelican Enterprises 2540 RIDGE ROAD LANSING ILLINOIS 60438 P S Send catalog modelers safety supplies RADIO CONTROL SHORT KITS FOR 25 TO 45 ENGINES VISIT OUR OUTLET STORE AT 15 MORGAN STREET IN CRYSTAL LAKE IL QUALITY PRODUCTS SINCE 1g64 THESE TWINS HAVE BEEN DESIGNED BY NATIONALS CHAMPION HAL PARENTI AND REFLECT HIGH CALIBER OF MODEL ENGINEERING THAT IS HARD TO BEAT AS WITH ALL OF OUR SHORT KITS THEY ARE BUILT AROUND FOAM CORE WING AND BOX FRAME FUSELAGE FOR SIMPLE BUT STURDY CONSTRUCTION THE SPECIALLY DESIGNED AIRFOILS AND GENEROUS TAIL AREAS GIVE THEM OUTSTANDING FLIGHTPERFORMANCE THROUGH OUT THE ENTIRE SPEED RANGE NEW P-38 LIGHTNING TWIN 706495 0 A-26 INVADER TWIN 685495 SHORT KITS INCWDE WING CORES CANOPIES COWLS PLANS ENGINE MOUNTS FIRE WALLS MOLDED MISC PARTS SHORT HARDWARE PACKAGE AND MATERIALS LIST FOR ADDITIONAL BALSA AND HARDWARE NEEDED ORDERING SEND CHECK OR MONEY ORDER FOR REOUIRED AMOUNT PLUS 450 PER KIT CANADIANS ADD $650 TO WING MFG PO BOX 33 CRYSTAL LAKE 1L60014 ILLINOIS RESI DENTS ADD 64% SALES TAX ALL ORDERS MUST REIN US FUNDS SEND 355 FDR PRODUCT CATALOG DESCRIRING OUR COMPLETE LINE OF FOAM WING CORES ACCESSORIES KITS TOOLS AND MUCH MORE sjh/A4 MEG WORLD WAR II FIGHTER SERIES AGM2 ZERO 54 SPAN 2995 P-40 TOMAHAWK 55 SPAN. 2995 P-39 A IRA COBRA 55 SPAN . 2995 P-Sb MUSTANG 54 SPAN . 2995 C202 FOLGORE 56 SPAN 5 FOCKE WULF 19054 SPAN. 2995 PHONE 815-459-0417 feel models can improved fair bit regret people dont have go F3B experience thrill pilot ing beautifully handling plane various tasks really belief F3B Formula Soaring hope few people will have go Sportsman TaskIF3B League introduced 1988 amazing few dedicated F3B fliers coun try Great BritainEd well international competitions Im sure would better still support come budding World Champs Have go dont know what youre missing Im thankful Bill Stephen Haley Great Britain took time share thoughts fellow sportsmen Thanks too Sean Walbank having news letter readand pass US Sailplaners ULF-1 plans article Wasserkuppe appeared May issue photos unusual glider known Ultra Light Footlaunch-One Quite few readers sent let ters requesting get plans infor mation interesting plane Unfortu nately didnt know time write plans MAs publisher Carl Wheeley did lot spadework located magic address Dieter Reich Heiner Neumann Anecho strasse No 16 D-8000 Munchen 82 West Ger ULF-1 plan pack consists 30 blueprints cutaway drawings illustrations English price 1986 360 Deutsch Marks about $215 current exchange rates source Carls information wants remind potential builders man-carrying craft footlaunch gliders just unforgiving life limb other aircraft advice anyone attempting fly should have prior struction training conventionally launched sailplanes Amen 1988 MARCS Sailplane Symposium Chairman Bill Vogelsang wants everyone know Symposium will held November 12-13 1988 Madison WI format will similar previous years talks table clinics etc may wish arrive early trip FAA Museum Oshkosh will arranged fall get-together becoming must Sailplaners Midwest others can fly weekend Anyone would like further information welcome write Bill 5933 Mayhill Dr Madison WI 53711 Slope Soaring news Im sure Sailplaners avidly reading Model Aviations new Slope Soaring column edited mark Triebes specialized Slope column first American magazines another sign progress making spreading gospel Person ally Im very encouraged positive things happening SoaringMarks new column being just example part future Ill concentrate flatland Soaring defer mark Slope matters may occasional exception special event feel close such Scale Slope Fun-Fly held Richland WA over Labor Day weekend Contest Direc tor Wil Byers phoned just before deadline time column let everyone know TRICS-sponsored Fun-Fly tremendous suc cess 58 fliers over 100 Scale planesboth regular Sailplanes Power Scale ships people came just spectate talk Scale Sailplanes 124 Saturday evening banquet turnout much much bigger us dared hope last year Bill Liscomb San Diego suggested such event Wil stepped forward offer TRICS magnificent slopes Give Sailplaners what want theyll come out also super support model man ufacturers dealers contributed over $4000 worth merchandise top ra dios Scale kits Wil said flier received some prize icing cake because everyone great time anyway Wil promised send complete report pictures next months column RC Giant Scale/de Vries Continued page 53 nique using plastic foam board Ken Otto elucidated techniques heat seating com ponents coatings white glue Vail Kinsey updated crowd silver-soldering techniques application silver soldering engine mufflers Leo Ford expert field demon strated fiberglass molding techniques including male female molds use release agents seminar topped off District IX Ra dio Frequency Coordinator Steve Mangles presented some enlightening facts about narrowband broadband transmitters receivers Theres lot recommend foilowing Chapter 90s lead scheduling such super show-andtell supreme example modelers helping modelers having ball doing recommending things club has taken plunge voted certify its RC transmitters May meeting certification orgy over 200 transmitters checked stickered Although isnt AMA requirement flying club field should now much safer electronically process combined use six carefully spaced concrete-block pilot positions should result mimmum radio interactive interference Now can convince people tum-on un less have pin latest Wendell Hostetlers Plans Works 1041 Heatherwood Lane Orrville OH 44667 big Fairchild PT-19 Its beautiful usual Wendell said moved bunch USAAF trainer drawings Toledo shin dig attesting excellence Bob Holman PO Box 741 San Bernardino CA 92402 producing some beauties World War subjects first SESA Dennis Bryant quarter-scale will knock sox off Dead-on scale shows mark master Scale builder drawings $2495 plus $3 P&H second new set plans Bob aimed true scratch-builder What hes done enlarge own Nieuport 17 drawings quarterscale show scale internal structure would adequate construct model truly dedicated builder plans $15 However Bob says hell send both SESA Nieuport 17 drawings customer $35posiaid Nicuport plans successful Bob mdiContinued page 144 September 1988 141
Edition: Model Aviation - 1988/09
Page Numbers: 50, 51, 135, 139, 140, 141
THE ULTIMATE Sailpianers art felt craft made modem all-glass technology completely formed molds Fi berglass fuselages have long made manner all-glass ship has molded wings tail surfaces well top F3B planes such built flown World Champions Rolf Decker Reinhard Liese made way Some commercially made Sailplanes like Rowings Impuls Fiberglasfiugels Albatross some big Scale Sallplanes like Roke DG 202 made molded glass too surpris ingly planes named made Germany Europeans have leaders technologyboth full-size Sailplanes models US needs catch up molded glass technology reason feel very fortunate have received step-by-step explanation molding glass expert Martin Bamert Martin Swiss citizen living temporarily Cal ifornia Martin sent written description molding included set 54 photos showing step process also sent samples wing stab sections molded carbon fiber ac cessory parts 23 pictures finished Glider named Speedo 87 plane de signed built Martin partner Jurg Wermuth lives Switzerland spection samples photographs Id say work Martin Jurg equal best being done today Truly ultimate modelers art Martins name sounds familiar may re call Dan Pruss article Slope flying Swiss Alps appeared May 1984 issue Model Aviation Dan told about traveling ca ble car up high mountain ski resort Swiss Sailplaners take over summer combi nation beautiful Scale Sailplanes /z- /3-scale combined gorgeous Alpine scen ery unforgettable Its ideal place slope fly Dan included several photos Martin flying own-design DG-100 428-meter span report Dans captions reads Martin Bainert considered best Switzerland free styles crowd Notice other Sailplanes parked Martin does thing Dans January 1985 RC Soaring column also photos Martin /3-scale DG-200 50-meter span Unfortunately isnt room column make complete showing Martins step-bystep construction photosbut have given few next best thing print pretty much Martins written descriptioneven cant see pictures Incidentally Martin sald spent 700 hours making molds alone Speedo 87 aerobatic Slope Racer discusses letter uses wing twisting roll control wings rotate slightly around wing joiner rod instead using alle rons roll plane Without further ado Martins letter report am going talk about two Gliders the Speedo 86 Speedo 87 Speedo 86 actually designed 1984 Jurg Wermuth friend Switzerland About three years ago Jurg sold two fuseHeres some process Martin Bamert uses produce molded Saliplanes First L aluminum framework surounds left wing master plug preparatory pouring first half mold L Object right another wing master plug resting atop finished half mold Com pleted wing mold R master form inside Big machine screws used jack mold halves apart theyre heavyl R&G Kunsttoff Tech nologie Swiss company supplies materiels Martin needed glass molding Theres lots information column Heres pair molded wing panels about born L Still encased molds see root-end wing L tip-end other R Roll control uses twist-wing method instead ailerons Wing panels pivot 8mm steel joiner rod Photo right shows Mar tin using spatula technique make stabilizer master mold visible 3-ft-long steel rod fastened top end work table attached end scraper maintains constant radius scraper drawn forward Stab mold plastic material 50 Model Aviation Radio Conoi Soaring Byron Blakeslee 3134 N Whrnebago Dr Sedalla CO 80135 lages valuable hints built two models Building model like ex actly easy task Because its small span 78 whole model has built very accu rately order achieve acceptable level performance glass fuselage white gel coat reinforced plenty carbon fiber Kevlar wing built foanilglass sheeted obechi wood glass cloth laid diagonally over foam cores increased torsional strength very important high-speed flights uses JW airfoil designed Jurg 10% thick slightly undercambered approaching trailing edge rudder well stabilizers sanded out piece balsawood Stab airfoil roughly NACA 0006 fully symmetrical Wing stabs rudder covered white polyester iron-on film gives model its final touch RC controls twist wings plus elevator rudder Building controls created some problems because space very limited fuselage though love working tweezers finally happy have completed installing three servos re cesver batteries first flights overwhelmed expecta tions flew slight upwind lightest Gliders fighting stay air wing loading 151 oz per sq ft quite accomplishment model also re sponded very well thermals easily climbed heights difficulty recognizing Speedo 86 completely aerobatic its element diving 600 800 ft straight down Nothing raffles shakes behaves stably predictably during high-speed flights Most kinetic energy can converted back height model has clocked over 100 mph have flown Speedo 86 over 120 hours have never crashed slope take results its attracting curious quisitive model pilots Conrjd page 135 New Fourmost Fillet QUICKCLEANEASY Stop messing around gummy fillers sticky putties Use Fourmost Fillet get clean perfect contour hassle Fourmost Fillet continuous strip vinyl preformed make perfect fillet Fillet may easily installed cyanoacrylate adhesives can finished either paint iron-on materials Fourmost Fillet also perfect wing saddle seats 2 sizes small No 128 medium No 129 Price 4 feet $350 Fourmost Products 4040 24th Ave Forest Grove OR 97116 503 357-2732 Carry Largest Only Stock Kraft Parts World .. Kraft alive working KRAFT MIDWEST Authorized warranty service ILL FLY WHAT FIX FREDUENCY CONVERSION $1000 Discount Regular Reparr Moot Make end Modete Converted Tuning Done Spectrum Analyzer Atso Service AU E/ 1iiiihi] Shad Only Full Time Servicenter Midwest ~W117 East Main St Northville Michigan 48167 Upper Lert IPhone 1-313-348-0085 Viee Meeterd Welcome r NE Vi f makers HEAD LOCK HEADLITE tm Features 1 STAINLESS STEEL HEAD LOCK tm glow plug connectoj strength corrosion free life 2FIELD REPLACEABLE 1 2 AH Nicad 3Built FULLY AUTOMATIC ON/OFF SWITCHto prevent short circuits pocket tool box 4LEO INDICATED charger available I-EAD-LLL. rri~$1695 FEAD-LITE m W/GHARGER-$2595 aeatable write direct add St 0045200 outse lSt MODEL PRODUCTS CORP PO BOX 100 ALLAMIJCHY NEW JERSEY 07820 September 1988 51 Molds used make Speedo 87 Slope Racer seen Above being sup ported designers/builders Jurg Wermuth L Martin Bamert MB initials tin Scene Swiss Alps Speedo 87 uses Multiplex Royal radio Below Rear servo drives pivoting wings short connecting rods Martin says plane will easily reach 150 mph dive Sorry say designers de cided model will sold/kitted US Pat4221452 os Pn RC Scale/Wischers Continued page 49 Consolidated Catalina both well-kept condition Two Royal Navy types also part show Fairey Swordfish early WV U vin tage flag-flying crew standing erect rear cockpit latest model Sea Harrier ar rived RNAS Yeovilton demonstrate slow hovering flight well high-speed passes time cover ears Another US product Fairchild A-b Thunderbolt II also known affectionately Warthog demonstrated extreme maneuverability its split ailerons able perform quite air show within small airports boundaries competition aerobatics enthusiasts flight routine one-of-a-kind Cran field A-i intended international aero batic contests design originated Cranfield College Industrial Technology Model flying United Kingdom trip visited three model flying sites first Tempsford disused WW II air base Only short length runway remains sur rounding farmland preserved RC model flying lady owns land also preserved another reason An old barn field national shrine base Westland Lysanders departed cross-Channel flights carrying supplies daring patriots supply continental underground operations dur ing WW II shown example RC flying management large club painted di visions pavement indicate model flier must stand avoid interference prob lems obligatory stand space flight also engine startup other activity tranamitter turned fellows extremely cautious about hazard radio interference Except feature could have watching sport flights right home four-stroke revolution has taken hold also few days later visited Chris Bradford Scale modeler flies both Control Line RC Marlborough flew Sopwith Pup typical grass field edge town powered English Laser four-stroke en gine Marlborough Model Hying Club has shelter house nearby also very smooth rugby field Control Line flying Laser quite impressive no nitro fuel will idie slow tick-over ac celerate full rpm hesitation Chris must impressed too has six Lasers both single-cylinder twins Chris Bradford also engine collector address 38 Barrow Close Marlborough Wiltshire 5N8 2BE Eng land has member UK World Championahip Scale teams 1984 1986 went westward visit James Pelly-Fry Scale modeler may remember published article Vickers Wellesley June 1988 issue Model Aviation new est Scale model deHavilland Devon twin ready fly test pilot Brian Taylor lives nearby local club smaller seem have no trouble interference flying site Merryfield little-used naval base 1-mile-long newly paved runway field has guard gate knows local modelers fly undisturbed end runway Another P-Si Information Bob Holman tells us Brian Taylors newest plan ready distribution Its P-51D Mustang designed 164 scale 60-size two-stroke 75/90 four-stroke engines Brian says no accurate scale drawing could found model built measurements photos Mustangs Imperial War Museum Dux ford England model weight just under 11 lb needed two ox tail ballast balance Adding tail weight Scale model rather rare occur rence used English Laser 75 four-stroke engine sufficient cooling chin air intake Exit air through scale exhaust pipes through fuselage radiator air outlet Span 69 An epoxy glass fuselage will available although drawing shows balsa construction An accessory package cludes detailed glass cowl hatch belly scoop canopy two drop tanks aluminum spin ner Bob Holman Plans PO Box 741 San Bernardino CA 92402 Paul Matt drawings Paul Joan Matt died last year concern among Scale modelers about what would become enor mous collection scale three-view drawings SunShine House Inc PO Box 2065 Terre Haute IN 47802 has acquired material Historical Aviation Album pub lished Paul Matt Included three- four-view scale drawings well last two Volumes 17 18 Historical Aviation Albums SunShine house has numerous books interest modelers Aviation Heritage Li brary series RC Soaring/Blakeslee Continued page 51 Surprised its great overall flight perform ance Jung decided join forces design Speedo 87 main reasons new de sign increase size times became problem recognlze correct position flying far away improve minor imper fections design utilize mod ern accurate building technology could accomplished employing molding tech nology using epoxy resins glass carbon Kevlar fibers Speedo 87 roughly 25% larger ample space inside fuselage cleaner flush wing-to-fuselage transition fiberglass sandwich glass-balsa-glass wing stabilator sections Because building molds very timeconsuming process Jung made fuselage mold did molds wings stabs special levers parts airfoil used RG 12A-18/90 18% camber 90% thick F3B airfoil designed Rudolf Girsberger Swiss model pilot stabs again used NACA 0006 airfoil order make wing molds first build positive formor master wing did covering foam cores prefabricated fiber glass skins skins epoxied cores clamped between two very accurate straight wooden blocks blocks look like 1 x 6 boards glued side-to-side form big butcher blocks six inches thick 18 wide five feet long have undoubtedly surfacemachined obtain flatness BB An obechi leading edge added sanded shape eight equally spaced stations made airfoil tem plates verili accuracy wing wings sprayed polyester surfacing maContinued page 139 Name Street Address City StateZip HoBD RNATIONAL INC September 1988 135 ZMA SECOND ANNUAL Memphis Belle Classic GIANT SCALE OCTOBER 15 & 16 1988FLY IN... SPONSORED BY THE MEMPHIS RADIO CONTROL CLUB MEMPHIS TN OAMA & IMAA SANCTIONED IMAA RULES WILL BE OBSERVED FOR FURTHER INFORMATION CALL RILL REATY EVENINGS 901-754-5083 DAYTIME 801780-7 180 MANLY WILLIAMS CD EVENINGS 9013881844 DAYTIME 9017812330 RC Soaring/Blakeslee Continued page 135 terial sanded eliminate imperfections Once master wings existed molding could proceed took place same wooden blocks originals pressed between wing placed within aluminum frame pieces covered gray molding resin Sorry can explain things very superficially otherwise would writing book top first coat thin glass layer added mixture resin quartz sand mechanically very stable material used fill frame addition two steel tubes fitted top frame hold mold together Once lower half mold existed upper half could built same way top lower part process done twice order come up molds both wings molds wing weigh about 120 lb finished molds polished treated separating agent white gel coat sprayed molds top glass cloth weighing 40 grams per sq meter added soaked epoxy resin 1/A balsawood skin put top soaked glass cloth setup placed polyethylene bag sealed vacuumed 24 hours After removal bag another layer glass cloth 120 grams per sq meter plus rein forcements put top balsa spars glued top lower sandwich wing subspars cut blue foam main spars consisted plywood carbon fibers Behind main spars place additional ballast weights main spar pretty involved because thickness air foil root 20mm dihedral built wing total dihedral 5 e edges carefully trimmed sharp knife wing halves glued together epoxy resin wing halves cant sanded prior gluing could dam age molds During gluing step molds securely clamped left leading-edgedownward epoxy would form nice fillet inside epoxy trailing edge thick ened wouldnt run down molds designed make wings span up 263 meters just cut ends off molded wing make required size experimenting different tip shapes though wing samples sent came ends first set have minor consistencies paint coverage can see what kind leading trailing edges well sur face quality can achieved using tech nology beauufulBB positive master form stabila tors done different way wings order achieve greater accuracy lead ing trailing edges spatula technique used much involved way building original return gives greatest possible accuracy current hightech F3B Gliders made way method starts very sturdy alumi num base plate exact length stab wing made end screwed air foil template exactly half airfoil show ing above base plate space between root tip airfoil templates base plate filled gray molding resin very straight rule resin dispersed within given space Starting trailing edge rule pulled forward toward leading edge drawing process repeated up 20 times amount resin scraped off decreases time root tip templates removed after resin cured aluminum frame bulit around base plate molding process pretty much same wings Since stabs symmetrical build upper lower section part Building actual stab done very much same fashion wing except balsawood used sandwich / thick mold fuselage explained before made friend Jurg mold rudder made exactly like stabs explained above cant explain exact malting fuselage mold Jurg has done job process commonly known anyway explain actual making fuselage top coat white gel coat polyes ter stinks terribly thin layer glass 40 gin per sq meter added before Kevlar cloth graphite fiber strands inserted Key lar about one-third lighter glass very difficult trim cut off carbon fibers added skinny tail sec tion fuselage absolute necessity high-speed flight model tends automati cally dive downward higher speeds reached stabilizers must exert downward force maintain level flight fuselage stiff enough will bend making control dif ficult make fuselage takes about eight hours Special parts Speedos made molded carbon fiber include stab crank lever incorporates two ball bearings wing joiner rod 8mm steel roller bearings ensure easy rotation wing panels first Speedo 87 models wings twisted small crank levers currently have gone directly driving leading edge pins Multiplex servo have used Multi plex Royal radio years am very satisfied really worried before maiden flight Speedo 87 after investing about 800 hours work worked project three months straight working regular job kind wonders what going hap pen flew beautifully major adjust ments After first few turns noticed its very stable uncritical flight behavior could barely stall did stall went smooth downward curve Its restitution ability convert speed height surprised because much better Speedo 86 very good itself Because its low-speed flying capabilities can take advantage smallest thermals updrafts its thin 9% airfoil also very fast Glider speeds up 150 mph easily reached Due its high penetration Speedo 87 also perfect aerobatics After about first two hours intensive fly ing could see easily outperformed its smaller brother Time after time Speedo 87 has admired amazed Glider pilots can say bragging pretty much outperforms Glider have ever flown owned within 17 years flying hope can see kind handcrafting involvement needed cant massproduce put realistic price tag model reasons Jurg have agreed sell Speedo 87 Thanks very much Martin Bamert tak ing time share important interest ing technology us hope descrip tion will encourage some Americans try du September 1988 139 plicate super-high-tech Sailpianes being made Europe F3B Britain recent issue Sean Walbanks White Sheet Club newsletter con tained very interesting article Bill Stephen Haley latest F3B design KB Merlin Stephen flew Merlin very creditable fourth place last years World Cham pionships Bill British ream manager came within few points repeating World Championsjust getting nipped wire Austrians Sean also edits Soaring column R/C Model World magazine well-known pursuing inside scoop model design ers Im sure Bill put arm him think youll enjoy story asked give story de velopment latest F3B model KB Merlin flown son Stephen fourth place 1987 World Champs West Germany first reaction far go back history Most competition model designers would proba bly agree good models normally devel oped over long period through series mod els model usually being modified version before no exception KB Merlin made some rather dras tic changes previous F3B models start Well feel obvious start ing point demise beloved Eppler 193 airfoil changing Quabeck section World Champs team trials expected take place late 1986 believe 193 finest all-around sections available Soaring fact placed fourth two pre vious team trials using section Having said time marches re alized although Thermal Distance tasks relatively easy 193 just fast enough modem international com petition mind built pair F3B mod els using Quabeck 210 section 2% camber 10% thick design span 116 straight-tapered nine-inch root seveninch tip chord models plug-on wings incorporating system using ballast tubes wing-joiner tubes %2-in ti tanium bar joiner effort try save weight decided eliminate spar using HT alloy tube spar reinforced carbon top bot tom wings covered epoxy/glass skins made sheet glass attached using ep oxy vacuum-bag system models corporated full-span flaperons operated two servos wing fact spar turned out far better theory practice crash 86 nation als split carbon-fibre away alloy tubes Stephens model later crash did same ie bond between tube carbon fiber wasnt good Per haps bad preparation tubes event never happy models al though definitely fast found banker event Duration task very much harder fact great difficulty thermaling properlythermal turns posing particular problems Having both European World Championships British team am con vinced British fliers best Thermal pi lots world dont have beat about bush Bill Tell us what thinkSW bad air lads will go looking lift hav ing found will work proven occasion Germany foreign fliers simply launched mod els sat wind hoped six min utes Enough prattle decided hold team trials May 87 rather Septem ber 1986 great lack success using Quabeck section felt another com plete rethink required com petitive time completed new fuse lage designed one-piece wing What wing section use started looking elusive worldbeater using very simple per formance criteria ie capable eight minutes flight average 24 laps Dis tance easy 16 seconds Speed timeall downdraughts Eventually came across Girsberger sections limited technical knowl edge decided RG 15 looked exactly what looking little naive thought discovered new wing section no else usinglittle did know outcome felt **it bust tlme either continue Quabeck section hope practice would make us competitive design build completely new models short time available hope flew off building board chose latter route Because felt either us successful getting British team would have time build spare models before World Championships July decided build two models trials large gamble failed perform no chance schedule programmed ensure least two models ready Christmas 86 would enable us get some practice incorporate modifications required other two models Once again theory proved better practiceand fact first ones completed month before team trialsnot enough time Wing construction again blue foam cores composite carbon-fibre spars time covered epoxy/glass skins applied wet plastic sheet still us ing vacuum-bag technique Ballast tubes incorporated wings access through small hatches wing top wing now one-piece except plug-on tips allow wings carried 10-ft model box plug-on tlps proved poor idea Controls ailerons rudder elevator trailing edge air brakes also incorporated arrester hook designed elec tronics expert Barry Mason springloaded rod projected straight down below cockpit actuated full rudder Barry fit ted pushbuttons onto transmitter gave us momentary full rudder release rod aimed wing loading 125 oz/sq ft planes fact turned out 135 oz/sq ft risk work worth Well af ter friend helped us CG use computer four models superb fly fact ways similar E193 ones have found Duration task rel atively easy achieve especially winch launches now getting about Distance task again very good feel need practice order improve As task has now altered man-on-man unlimited laps four minutes awful lot points can gained lost Much skill required now get best out model Distance Ballasting example now critical ever air speed has spot-on positioning course vital Lastly probably impor tant good teammates needed keep informed what other fliers ing task usually flown four group last task Speed KB Merlin fast Well Steve proved fastest fliers week Germany actually fast est days atrocious weather condi tions During practice before competition did run 165 seconds Simprops private fly ing field pretty obvious above delighted results efforts time published should well way 88 models leamed great deal 87 World Championships etc 140 Model Aviation MODELERS FIGHT-BACK TRUE-FACTS N EWSLETTER 444 Tired b ing ignorci editors Fed up wills never having questions answered FIGHT BAcIt Join us letter year s reader written publication spen letter communication between fellow modelers R$ fre flight 5 good thLsg iV TSonly wst Mississippi 2 Atvse limits models orflpiig sites 2 YhatLvfvrinsisrsisseiehst eye rktc IASstility toiecerd UIA Hhy AU LETTERS PUBUSI/AD $300 recieve sne copy $550 pub letter & copy $1950 4 issues & letters 1 yr Quarterly July OctJanApril THE PTERANODON PRESS 42 55 551 55 CA MASK CA glue works wonders building ntodels right Unfortunately gives enough fumes knock vulture off carcass modelers have suffered medical problems after inhaling CA fumes take chances special vapor respirator filters CA fumes soft face mask adjustable straps comfortably fits face sizes easy breathing valve allows prolonged use providing dependable filtering concentrations up 1000 PPM though rugged industrial mask light weight elimi nate fatigue Dont get gassed CA Get protected Order CA Mask today Just $1247 shipping cheaper hospital visit Money order Master Charge Visa include expiration date check allow 20 days clear Sorry no CODs Pelican Enterprises 2540 RIDGE ROAD LANSING ILLINOIS 60438 P S Send catalog modelers safety supplies RADIO CONTROL SHORT KITS FOR 25 TO 45 ENGINES VISIT OUR OUTLET STORE AT 15 MORGAN STREET IN CRYSTAL LAKE IL QUALITY PRODUCTS SINCE 1g64 THESE TWINS HAVE BEEN DESIGNED BY NATIONALS CHAMPION HAL PARENTI AND REFLECT HIGH CALIBER OF MODEL ENGINEERING THAT IS HARD TO BEAT AS WITH ALL OF OUR SHORT KITS THEY ARE BUILT AROUND FOAM CORE WING AND BOX FRAME FUSELAGE FOR SIMPLE BUT STURDY CONSTRUCTION THE SPECIALLY DESIGNED AIRFOILS AND GENEROUS TAIL AREAS GIVE THEM OUTSTANDING FLIGHTPERFORMANCE THROUGH OUT THE ENTIRE SPEED RANGE NEW P-38 LIGHTNING TWIN 706495 0 A-26 INVADER TWIN 685495 SHORT KITS INCWDE WING CORES CANOPIES COWLS PLANS ENGINE MOUNTS FIRE WALLS MOLDED MISC PARTS SHORT HARDWARE PACKAGE AND MATERIALS LIST FOR ADDITIONAL BALSA AND HARDWARE NEEDED ORDERING SEND CHECK OR MONEY ORDER FOR REOUIRED AMOUNT PLUS 450 PER KIT CANADIANS ADD $650 TO WING MFG PO BOX 33 CRYSTAL LAKE 1L60014 ILLINOIS RESI DENTS ADD 64% SALES TAX ALL ORDERS MUST REIN US FUNDS SEND 355 FDR PRODUCT CATALOG DESCRIRING OUR COMPLETE LINE OF FOAM WING CORES ACCESSORIES KITS TOOLS AND MUCH MORE sjh/A4 MEG WORLD WAR II FIGHTER SERIES AGM2 ZERO 54 SPAN 2995 P-40 TOMAHAWK 55 SPAN. 2995 P-39 A IRA COBRA 55 SPAN . 2995 P-Sb MUSTANG 54 SPAN . 2995 C202 FOLGORE 56 SPAN 5 FOCKE WULF 19054 SPAN. 2995 PHONE 815-459-0417 feel models can improved fair bit regret people dont have go F3B experience thrill pilot ing beautifully handling plane various tasks really belief F3B Formula Soaring hope few people will have go Sportsman TaskIF3B League introduced 1988 amazing few dedicated F3B fliers coun try Great BritainEd well international competitions Im sure would better still support come budding World Champs Have go dont know what youre missing Im thankful Bill Stephen Haley Great Britain took time share thoughts fellow sportsmen Thanks too Sean Walbank having news letter readand pass US Sailplaners ULF-1 plans article Wasserkuppe appeared May issue photos unusual glider known Ultra Light Footlaunch-One Quite few readers sent let ters requesting get plans infor mation interesting plane Unfortu nately didnt know time write plans MAs publisher Carl Wheeley did lot spadework located magic address Dieter Reich Heiner Neumann Anecho strasse No 16 D-8000 Munchen 82 West Ger ULF-1 plan pack consists 30 blueprints cutaway drawings illustrations English price 1986 360 Deutsch Marks about $215 current exchange rates source Carls information wants remind potential builders man-carrying craft footlaunch gliders just unforgiving life limb other aircraft advice anyone attempting fly should have prior struction training conventionally launched sailplanes Amen 1988 MARCS Sailplane Symposium Chairman Bill Vogelsang wants everyone know Symposium will held November 12-13 1988 Madison WI format will similar previous years talks table clinics etc may wish arrive early trip FAA Museum Oshkosh will arranged fall get-together becoming must Sailplaners Midwest others can fly weekend Anyone would like further information welcome write Bill 5933 Mayhill Dr Madison WI 53711 Slope Soaring news Im sure Sailplaners avidly reading Model Aviations new Slope Soaring column edited mark Triebes specialized Slope column first American magazines another sign progress making spreading gospel Person ally Im very encouraged positive things happening SoaringMarks new column being just example part future Ill concentrate flatland Soaring defer mark Slope matters may occasional exception special event feel close such Scale Slope Fun-Fly held Richland WA over Labor Day weekend Contest Direc tor Wil Byers phoned just before deadline time column let everyone know TRICS-sponsored Fun-Fly tremendous suc cess 58 fliers over 100 Scale planesboth regular Sailplanes Power Scale ships people came just spectate talk Scale Sailplanes 124 Saturday evening banquet turnout much much bigger us dared hope last year Bill Liscomb San Diego suggested such event Wil stepped forward offer TRICS magnificent slopes Give Sailplaners what want theyll come out also super support model man ufacturers dealers contributed over $4000 worth merchandise top ra dios Scale kits Wil said flier received some prize icing cake because everyone great time anyway Wil promised send complete report pictures next months column RC Giant Scale/de Vries Continued page 53 nique using plastic foam board Ken Otto elucidated techniques heat seating com ponents coatings white glue Vail Kinsey updated crowd silver-soldering techniques application silver soldering engine mufflers Leo Ford expert field demon strated fiberglass molding techniques including male female molds use release agents seminar topped off District IX Ra dio Frequency Coordinator Steve Mangles presented some enlightening facts about narrowband broadband transmitters receivers Theres lot recommend foilowing Chapter 90s lead scheduling such super show-andtell supreme example modelers helping modelers having ball doing recommending things club has taken plunge voted certify its RC transmitters May meeting certification orgy over 200 transmitters checked stickered Although isnt AMA requirement flying club field should now much safer electronically process combined use six carefully spaced concrete-block pilot positions should result mimmum radio interactive interference Now can convince people tum-on un less have pin latest Wendell Hostetlers Plans Works 1041 Heatherwood Lane Orrville OH 44667 big Fairchild PT-19 Its beautiful usual Wendell said moved bunch USAAF trainer drawings Toledo shin dig attesting excellence Bob Holman PO Box 741 San Bernardino CA 92402 producing some beauties World War subjects first SESA Dennis Bryant quarter-scale will knock sox off Dead-on scale shows mark master Scale builder drawings $2495 plus $3 P&H second new set plans Bob aimed true scratch-builder What hes done enlarge own Nieuport 17 drawings quarterscale show scale internal structure would adequate construct model truly dedicated builder plans $15 However Bob says hell send both SESA Nieuport 17 drawings customer $35posiaid Nicuport plans successful Bob mdiContinued page 144 September 1988 141
Edition: Model Aviation - 1988/09
Page Numbers: 50, 51, 135, 139, 140, 141
THE ULTIMATE Sailpianers art felt craft made modem all-glass technology completely formed molds Fi berglass fuselages have long made manner all-glass ship has molded wings tail surfaces well top F3B planes such built flown World Champions Rolf Decker Reinhard Liese made way Some commercially made Sailplanes like Rowings Impuls Fiberglasfiugels Albatross some big Scale Sallplanes like Roke DG 202 made molded glass too surpris ingly planes named made Germany Europeans have leaders technologyboth full-size Sailplanes models US needs catch up molded glass technology reason feel very fortunate have received step-by-step explanation molding glass expert Martin Bamert Martin Swiss citizen living temporarily Cal ifornia Martin sent written description molding included set 54 photos showing step process also sent samples wing stab sections molded carbon fiber ac cessory parts 23 pictures finished Glider named Speedo 87 plane de signed built Martin partner Jurg Wermuth lives Switzerland spection samples photographs Id say work Martin Jurg equal best being done today Truly ultimate modelers art Martins name sounds familiar may re call Dan Pruss article Slope flying Swiss Alps appeared May 1984 issue Model Aviation Dan told about traveling ca ble car up high mountain ski resort Swiss Sailplaners take over summer combi nation beautiful Scale Sailplanes /z- /3-scale combined gorgeous Alpine scen ery unforgettable Its ideal place slope fly Dan included several photos Martin flying own-design DG-100 428-meter span report Dans captions reads Martin Bainert considered best Switzerland free styles crowd Notice other Sailplanes parked Martin does thing Dans January 1985 RC Soaring column also photos Martin /3-scale DG-200 50-meter span Unfortunately isnt room column make complete showing Martins step-bystep construction photosbut have given few next best thing print pretty much Martins written descriptioneven cant see pictures Incidentally Martin sald spent 700 hours making molds alone Speedo 87 aerobatic Slope Racer discusses letter uses wing twisting roll control wings rotate slightly around wing joiner rod instead using alle rons roll plane Without further ado Martins letter report am going talk about two Gliders the Speedo 86 Speedo 87 Speedo 86 actually designed 1984 Jurg Wermuth friend Switzerland About three years ago Jurg sold two fuseHeres some process Martin Bamert uses produce molded Saliplanes First L aluminum framework surounds left wing master plug preparatory pouring first half mold L Object right another wing master plug resting atop finished half mold Com pleted wing mold R master form inside Big machine screws used jack mold halves apart theyre heavyl R&G Kunsttoff Tech nologie Swiss company supplies materiels Martin needed glass molding Theres lots information column Heres pair molded wing panels about born L Still encased molds see root-end wing L tip-end other R Roll control uses twist-wing method instead ailerons Wing panels pivot 8mm steel joiner rod Photo right shows Mar tin using spatula technique make stabilizer master mold visible 3-ft-long steel rod fastened top end work table attached end scraper maintains constant radius scraper drawn forward Stab mold plastic material 50 Model Aviation Radio Conoi Soaring Byron Blakeslee 3134 N Whrnebago Dr Sedalla CO 80135 lages valuable hints built two models Building model like ex actly easy task Because its small span 78 whole model has built very accu rately order achieve acceptable level performance glass fuselage white gel coat reinforced plenty carbon fiber Kevlar wing built foanilglass sheeted obechi wood glass cloth laid diagonally over foam cores increased torsional strength very important high-speed flights uses JW airfoil designed Jurg 10% thick slightly undercambered approaching trailing edge rudder well stabilizers sanded out piece balsawood Stab airfoil roughly NACA 0006 fully symmetrical Wing stabs rudder covered white polyester iron-on film gives model its final touch RC controls twist wings plus elevator rudder Building controls created some problems because space very limited fuselage though love working tweezers finally happy have completed installing three servos re cesver batteries first flights overwhelmed expecta tions flew slight upwind lightest Gliders fighting stay air wing loading 151 oz per sq ft quite accomplishment model also re sponded very well thermals easily climbed heights difficulty recognizing Speedo 86 completely aerobatic its element diving 600 800 ft straight down Nothing raffles shakes behaves stably predictably during high-speed flights Most kinetic energy can converted back height model has clocked over 100 mph have flown Speedo 86 over 120 hours have never crashed slope take results its attracting curious quisitive model pilots Conrjd page 135 New Fourmost Fillet QUICKCLEANEASY Stop messing around gummy fillers sticky putties Use Fourmost Fillet get clean perfect contour hassle Fourmost Fillet continuous strip vinyl preformed make perfect fillet Fillet may easily installed cyanoacrylate adhesives can finished either paint iron-on materials Fourmost Fillet also perfect wing saddle seats 2 sizes small No 128 medium No 129 Price 4 feet $350 Fourmost Products 4040 24th Ave Forest Grove OR 97116 503 357-2732 Carry Largest Only Stock Kraft Parts World .. Kraft alive working KRAFT MIDWEST Authorized warranty service ILL FLY WHAT FIX FREDUENCY CONVERSION $1000 Discount Regular Reparr Moot Make end Modete Converted Tuning Done Spectrum Analyzer Atso Service AU E/ 1iiiihi] Shad Only Full Time Servicenter Midwest ~W117 East Main St Northville Michigan 48167 Upper Lert IPhone 1-313-348-0085 Viee Meeterd Welcome r NE Vi f makers HEAD LOCK HEADLITE tm Features 1 STAINLESS STEEL HEAD LOCK tm glow plug connectoj strength corrosion free life 2FIELD REPLACEABLE 1 2 AH Nicad 3Built FULLY AUTOMATIC ON/OFF SWITCHto prevent short circuits pocket tool box 4LEO INDICATED charger available I-EAD-LLL. rri~$1695 FEAD-LITE m W/GHARGER-$2595 aeatable write direct add St 0045200 outse lSt MODEL PRODUCTS CORP PO BOX 100 ALLAMIJCHY NEW JERSEY 07820 September 1988 51 Molds used make Speedo 87 Slope Racer seen Above being sup ported designers/builders Jurg Wermuth L Martin Bamert MB initials tin Scene Swiss Alps Speedo 87 uses Multiplex Royal radio Below Rear servo drives pivoting wings short connecting rods Martin says plane will easily reach 150 mph dive Sorry say designers de cided model will sold/kitted US Pat4221452 os Pn RC Scale/Wischers Continued page 49 Consolidated Catalina both well-kept condition Two Royal Navy types also part show Fairey Swordfish early WV U vin tage flag-flying crew standing erect rear cockpit latest model Sea Harrier ar rived RNAS Yeovilton demonstrate slow hovering flight well high-speed passes time cover ears Another US product Fairchild A-b Thunderbolt II also known affectionately Warthog demonstrated extreme maneuverability its split ailerons able perform quite air show within small airports boundaries competition aerobatics enthusiasts flight routine one-of-a-kind Cran field A-i intended international aero batic contests design originated Cranfield College Industrial Technology Model flying United Kingdom trip visited three model flying sites first Tempsford disused WW II air base Only short length runway remains sur rounding farmland preserved RC model flying lady owns land also preserved another reason An old barn field national shrine base Westland Lysanders departed cross-Channel flights carrying supplies daring patriots supply continental underground operations dur ing WW II shown example RC flying management large club painted di visions pavement indicate model flier must stand avoid interference prob lems obligatory stand space flight also engine startup other activity tranamitter turned fellows extremely cautious about hazard radio interference Except feature could have watching sport flights right home four-stroke revolution has taken hold also few days later visited Chris Bradford Scale modeler flies both Control Line RC Marlborough flew Sopwith Pup typical grass field edge town powered English Laser four-stroke en gine Marlborough Model Hying Club has shelter house nearby also very smooth rugby field Control Line flying Laser quite impressive no nitro fuel will idie slow tick-over ac celerate full rpm hesitation Chris must impressed too has six Lasers both single-cylinder twins Chris Bradford also engine collector address 38 Barrow Close Marlborough Wiltshire 5N8 2BE Eng land has member UK World Championahip Scale teams 1984 1986 went westward visit James Pelly-Fry Scale modeler may remember published article Vickers Wellesley June 1988 issue Model Aviation new est Scale model deHavilland Devon twin ready fly test pilot Brian Taylor lives nearby local club smaller seem have no trouble interference flying site Merryfield little-used naval base 1-mile-long newly paved runway field has guard gate knows local modelers fly undisturbed end runway Another P-Si Information Bob Holman tells us Brian Taylors newest plan ready distribution Its P-51D Mustang designed 164 scale 60-size two-stroke 75/90 four-stroke engines Brian says no accurate scale drawing could found model built measurements photos Mustangs Imperial War Museum Dux ford England model weight just under 11 lb needed two ox tail ballast balance Adding tail weight Scale model rather rare occur rence used English Laser 75 four-stroke engine sufficient cooling chin air intake Exit air through scale exhaust pipes through fuselage radiator air outlet Span 69 An epoxy glass fuselage will available although drawing shows balsa construction An accessory package cludes detailed glass cowl hatch belly scoop canopy two drop tanks aluminum spin ner Bob Holman Plans PO Box 741 San Bernardino CA 92402 Paul Matt drawings Paul Joan Matt died last year concern among Scale modelers about what would become enor mous collection scale three-view drawings SunShine House Inc PO Box 2065 Terre Haute IN 47802 has acquired material Historical Aviation Album pub lished Paul Matt Included three- four-view scale drawings well last two Volumes 17 18 Historical Aviation Albums SunShine house has numerous books interest modelers Aviation Heritage Li brary series RC Soaring/Blakeslee Continued page 51 Surprised its great overall flight perform ance Jung decided join forces design Speedo 87 main reasons new de sign increase size times became problem recognlze correct position flying far away improve minor imper fections design utilize mod ern accurate building technology could accomplished employing molding tech nology using epoxy resins glass carbon Kevlar fibers Speedo 87 roughly 25% larger ample space inside fuselage cleaner flush wing-to-fuselage transition fiberglass sandwich glass-balsa-glass wing stabilator sections Because building molds very timeconsuming process Jung made fuselage mold did molds wings stabs special levers parts airfoil used RG 12A-18/90 18% camber 90% thick F3B airfoil designed Rudolf Girsberger Swiss model pilot stabs again used NACA 0006 airfoil order make wing molds first build positive formor master wing did covering foam cores prefabricated fiber glass skins skins epoxied cores clamped between two very accurate straight wooden blocks blocks look like 1 x 6 boards glued side-to-side form big butcher blocks six inches thick 18 wide five feet long have undoubtedly surfacemachined obtain flatness BB An obechi leading edge added sanded shape eight equally spaced stations made airfoil tem plates verili accuracy wing wings sprayed polyester surfacing maContinued page 139 Name Street Address City StateZip HoBD RNATIONAL INC September 1988 135 ZMA SECOND ANNUAL Memphis Belle Classic GIANT SCALE OCTOBER 15 & 16 1988FLY IN... SPONSORED BY THE MEMPHIS RADIO CONTROL CLUB MEMPHIS TN OAMA & IMAA SANCTIONED IMAA RULES WILL BE OBSERVED FOR FURTHER INFORMATION CALL RILL REATY EVENINGS 901-754-5083 DAYTIME 801780-7 180 MANLY WILLIAMS CD EVENINGS 9013881844 DAYTIME 9017812330 RC Soaring/Blakeslee Continued page 135 terial sanded eliminate imperfections Once master wings existed molding could proceed took place same wooden blocks originals pressed between wing placed within aluminum frame pieces covered gray molding resin Sorry can explain things very superficially otherwise would writing book top first coat thin glass layer added mixture resin quartz sand mechanically very stable material used fill frame addition two steel tubes fitted top frame hold mold together Once lower half mold existed upper half could built same way top lower part process done twice order come up molds both wings molds wing weigh about 120 lb finished molds polished treated separating agent white gel coat sprayed molds top glass cloth weighing 40 grams per sq meter added soaked epoxy resin 1/A balsawood skin put top soaked glass cloth setup placed polyethylene bag sealed vacuumed 24 hours After removal bag another layer glass cloth 120 grams per sq meter plus rein forcements put top balsa spars glued top lower sandwich wing subspars cut blue foam main spars consisted plywood carbon fibers Behind main spars place additional ballast weights main spar pretty involved because thickness air foil root 20mm dihedral built wing total dihedral 5 e edges carefully trimmed sharp knife wing halves glued together epoxy resin wing halves cant sanded prior gluing could dam age molds During gluing step molds securely clamped left leading-edgedownward epoxy would form nice fillet inside epoxy trailing edge thick ened wouldnt run down molds designed make wings span up 263 meters just cut ends off molded wing make required size experimenting different tip shapes though wing samples sent came ends first set have minor consistencies paint coverage can see what kind leading trailing edges well sur face quality can achieved using tech nology beauufulBB positive master form stabila tors done different way wings order achieve greater accuracy lead ing trailing edges spatula technique used much involved way building original return gives greatest possible accuracy current hightech F3B Gliders made way method starts very sturdy alumi num base plate exact length stab wing made end screwed air foil template exactly half airfoil show ing above base plate space between root tip airfoil templates base plate filled gray molding resin very straight rule resin dispersed within given space Starting trailing edge rule pulled forward toward leading edge drawing process repeated up 20 times amount resin scraped off decreases time root tip templates removed after resin cured aluminum frame bulit around base plate molding process pretty much same wings Since stabs symmetrical build upper lower section part Building actual stab done very much same fashion wing except balsawood used sandwich / thick mold fuselage explained before made friend Jurg mold rudder made exactly like stabs explained above cant explain exact malting fuselage mold Jurg has done job process commonly known anyway explain actual making fuselage top coat white gel coat polyes ter stinks terribly thin layer glass 40 gin per sq meter added before Kevlar cloth graphite fiber strands inserted Key lar about one-third lighter glass very difficult trim cut off carbon fibers added skinny tail sec tion fuselage absolute necessity high-speed flight model tends automati cally dive downward higher speeds reached stabilizers must exert downward force maintain level flight fuselage stiff enough will bend making control dif ficult make fuselage takes about eight hours Special parts Speedos made molded carbon fiber include stab crank lever incorporates two ball bearings wing joiner rod 8mm steel roller bearings ensure easy rotation wing panels first Speedo 87 models wings twisted small crank levers currently have gone directly driving leading edge pins Multiplex servo have used Multi plex Royal radio years am very satisfied really worried before maiden flight Speedo 87 after investing about 800 hours work worked project three months straight working regular job kind wonders what going hap pen flew beautifully major adjust ments After first few turns noticed its very stable uncritical flight behavior could barely stall did stall went smooth downward curve Its restitution ability convert speed height surprised because much better Speedo 86 very good itself Because its low-speed flying capabilities can take advantage smallest thermals updrafts its thin 9% airfoil also very fast Glider speeds up 150 mph easily reached Due its high penetration Speedo 87 also perfect aerobatics After about first two hours intensive fly ing could see easily outperformed its smaller brother Time after time Speedo 87 has admired amazed Glider pilots can say bragging pretty much outperforms Glider have ever flown owned within 17 years flying hope can see kind handcrafting involvement needed cant massproduce put realistic price tag model reasons Jurg have agreed sell Speedo 87 Thanks very much Martin Bamert tak ing time share important interest ing technology us hope descrip tion will encourage some Americans try du September 1988 139 plicate super-high-tech Sailpianes being made Europe F3B Britain recent issue Sean Walbanks White Sheet Club newsletter con tained very interesting article Bill Stephen Haley latest F3B design KB Merlin Stephen flew Merlin very creditable fourth place last years World Cham pionships Bill British ream manager came within few points repeating World Championsjust getting nipped wire Austrians Sean also edits Soaring column R/C Model World magazine well-known pursuing inside scoop model design ers Im sure Bill put arm him think youll enjoy story asked give story de velopment latest F3B model KB Merlin flown son Stephen fourth place 1987 World Champs West Germany first reaction far go back history Most competition model designers would proba bly agree good models normally devel oped over long period through series mod els model usually being modified version before no exception KB Merlin made some rather dras tic changes previous F3B models start Well feel obvious start ing point demise beloved Eppler 193 airfoil changing Quabeck section World Champs team trials expected take place late 1986 believe 193 finest all-around sections available Soaring fact placed fourth two pre vious team trials using section Having said time marches re alized although Thermal Distance tasks relatively easy 193 just fast enough modem international com petition mind built pair F3B mod els using Quabeck 210 section 2% camber 10% thick design span 116 straight-tapered nine-inch root seveninch tip chord models plug-on wings incorporating system using ballast tubes wing-joiner tubes %2-in ti tanium bar joiner effort try save weight decided eliminate spar using HT alloy tube spar reinforced carbon top bot tom wings covered epoxy/glass skins made sheet glass attached using ep oxy vacuum-bag system models corporated full-span flaperons operated two servos wing fact spar turned out far better theory practice crash 86 nation als split carbon-fibre away alloy tubes Stephens model later crash did same ie bond between tube carbon fiber wasnt good Per haps bad preparation tubes event never happy models al though definitely fast found banker event Duration task very much harder fact great difficulty thermaling properlythermal turns posing particular problems Having both European World Championships British team am con vinced British fliers best Thermal pi lots world dont have beat about bush Bill Tell us what thinkSW bad air lads will go looking lift hav ing found will work proven occasion Germany foreign fliers simply launched mod els sat wind hoped six min utes Enough prattle decided hold team trials May 87 rather Septem ber 1986 great lack success using Quabeck section felt another com plete rethink required com petitive time completed new fuse lage designed one-piece wing What wing section use started looking elusive worldbeater using very simple per formance criteria ie capable eight minutes flight average 24 laps Dis tance easy 16 seconds Speed timeall downdraughts Eventually came across Girsberger sections limited technical knowl edge decided RG 15 looked exactly what looking little naive thought discovered new wing section no else usinglittle did know outcome felt **it bust tlme either continue Quabeck section hope practice would make us competitive design build completely new models short time available hope flew off building board chose latter route Because felt either us successful getting British team would have time build spare models before World Championships July decided build two models trials large gamble failed perform no chance schedule programmed ensure least two models ready Christmas 86 would enable us get some practice incorporate modifications required other two models Once again theory proved better practiceand fact first ones completed month before team trialsnot enough time Wing construction again blue foam cores composite carbon-fibre spars time covered epoxy/glass skins applied wet plastic sheet still us ing vacuum-bag technique Ballast tubes incorporated wings access through small hatches wing top wing now one-piece except plug-on tips allow wings carried 10-ft model box plug-on tlps proved poor idea Controls ailerons rudder elevator trailing edge air brakes also incorporated arrester hook designed elec tronics expert Barry Mason springloaded rod projected straight down below cockpit actuated full rudder Barry fit ted pushbuttons onto transmitter gave us momentary full rudder release rod aimed wing loading 125 oz/sq ft planes fact turned out 135 oz/sq ft risk work worth Well af ter friend helped us CG use computer four models superb fly fact ways similar E193 ones have found Duration task rel atively easy achieve especially winch launches now getting about Distance task again very good feel need practice order improve As task has now altered man-on-man unlimited laps four minutes awful lot points can gained lost Much skill required now get best out model Distance Ballasting example now critical ever air speed has spot-on positioning course vital Lastly probably impor tant good teammates needed keep informed what other fliers ing task usually flown four group last task Speed KB Merlin fast Well Steve proved fastest fliers week Germany actually fast est days atrocious weather condi tions During practice before competition did run 165 seconds Simprops private fly ing field pretty obvious above delighted results efforts time published should well way 88 models leamed great deal 87 World Championships etc 140 Model Aviation MODELERS FIGHT-BACK TRUE-FACTS N EWSLETTER 444 Tired b ing ignorci editors Fed up wills never having questions answered FIGHT BAcIt Join us letter year s reader written publication spen letter communication between fellow modelers R$ fre flight 5 good thLsg iV TSonly wst Mississippi 2 Atvse limits models orflpiig sites 2 YhatLvfvrinsisrsisseiehst eye rktc IASstility toiecerd UIA Hhy AU LETTERS PUBUSI/AD $300 recieve sne copy $550 pub letter & copy $1950 4 issues & letters 1 yr Quarterly July OctJanApril THE PTERANODON PRESS 42 55 551 55 CA MASK CA glue works wonders building ntodels right Unfortunately gives enough fumes knock vulture off carcass modelers have suffered medical problems after inhaling CA fumes take chances special vapor respirator filters CA fumes soft face mask adjustable straps comfortably fits face sizes easy breathing valve allows prolonged use providing dependable filtering concentrations up 1000 PPM though rugged industrial mask light weight elimi nate fatigue Dont get gassed CA Get protected Order CA Mask today Just $1247 shipping cheaper hospital visit Money order Master Charge Visa include expiration date check allow 20 days clear Sorry no CODs Pelican Enterprises 2540 RIDGE ROAD LANSING ILLINOIS 60438 P S Send catalog modelers safety supplies RADIO CONTROL SHORT KITS FOR 25 TO 45 ENGINES VISIT OUR OUTLET STORE AT 15 MORGAN STREET IN CRYSTAL LAKE IL QUALITY PRODUCTS SINCE 1g64 THESE TWINS HAVE BEEN DESIGNED BY NATIONALS CHAMPION HAL PARENTI AND REFLECT HIGH CALIBER OF MODEL ENGINEERING THAT IS HARD TO BEAT AS WITH ALL OF OUR SHORT KITS THEY ARE BUILT AROUND FOAM CORE WING AND BOX FRAME FUSELAGE FOR SIMPLE BUT STURDY CONSTRUCTION THE SPECIALLY DESIGNED AIRFOILS AND GENEROUS TAIL AREAS GIVE THEM OUTSTANDING FLIGHTPERFORMANCE THROUGH OUT THE ENTIRE SPEED RANGE NEW P-38 LIGHTNING TWIN 706495 0 A-26 INVADER TWIN 685495 SHORT KITS INCWDE WING CORES CANOPIES COWLS PLANS ENGINE MOUNTS FIRE WALLS MOLDED MISC PARTS SHORT HARDWARE PACKAGE AND MATERIALS LIST FOR ADDITIONAL BALSA AND HARDWARE NEEDED ORDERING SEND CHECK OR MONEY ORDER FOR REOUIRED AMOUNT PLUS 450 PER KIT CANADIANS ADD $650 TO WING MFG PO BOX 33 CRYSTAL LAKE 1L60014 ILLINOIS RESI DENTS ADD 64% SALES TAX ALL ORDERS MUST REIN US FUNDS SEND 355 FDR PRODUCT CATALOG DESCRIRING OUR COMPLETE LINE OF FOAM WING CORES ACCESSORIES KITS TOOLS AND MUCH MORE sjh/A4 MEG WORLD WAR II FIGHTER SERIES AGM2 ZERO 54 SPAN 2995 P-40 TOMAHAWK 55 SPAN. 2995 P-39 A IRA COBRA 55 SPAN . 2995 P-Sb MUSTANG 54 SPAN . 2995 C202 FOLGORE 56 SPAN 5 FOCKE WULF 19054 SPAN. 2995 PHONE 815-459-0417 feel models can improved fair bit regret people dont have go F3B experience thrill pilot ing beautifully handling plane various tasks really belief F3B Formula Soaring hope few people will have go Sportsman TaskIF3B League introduced 1988 amazing few dedicated F3B fliers coun try Great BritainEd well international competitions Im sure would better still support come budding World Champs Have go dont know what youre missing Im thankful Bill Stephen Haley Great Britain took time share thoughts fellow sportsmen Thanks too Sean Walbank having news letter readand pass US Sailplaners ULF-1 plans article Wasserkuppe appeared May issue photos unusual glider known Ultra Light Footlaunch-One Quite few readers sent let ters requesting get plans infor mation interesting plane Unfortu nately didnt know time write plans MAs publisher Carl Wheeley did lot spadework located magic address Dieter Reich Heiner Neumann Anecho strasse No 16 D-8000 Munchen 82 West Ger ULF-1 plan pack consists 30 blueprints cutaway drawings illustrations English price 1986 360 Deutsch Marks about $215 current exchange rates source Carls information wants remind potential builders man-carrying craft footlaunch gliders just unforgiving life limb other aircraft advice anyone attempting fly should have prior struction training conventionally launched sailplanes Amen 1988 MARCS Sailplane Symposium Chairman Bill Vogelsang wants everyone know Symposium will held November 12-13 1988 Madison WI format will similar previous years talks table clinics etc may wish arrive early trip FAA Museum Oshkosh will arranged fall get-together becoming must Sailplaners Midwest others can fly weekend Anyone would like further information welcome write Bill 5933 Mayhill Dr Madison WI 53711 Slope Soaring news Im sure Sailplaners avidly reading Model Aviations new Slope Soaring column edited mark Triebes specialized Slope column first American magazines another sign progress making spreading gospel Person ally Im very encouraged positive things happening SoaringMarks new column being just example part future Ill concentrate flatland Soaring defer mark Slope matters may occasional exception special event feel close such Scale Slope Fun-Fly held Richland WA over Labor Day weekend Contest Direc tor Wil Byers phoned just before deadline time column let everyone know TRICS-sponsored Fun-Fly tremendous suc cess 58 fliers over 100 Scale planesboth regular Sailplanes Power Scale ships people came just spectate talk Scale Sailplanes 124 Saturday evening banquet turnout much much bigger us dared hope last year Bill Liscomb San Diego suggested such event Wil stepped forward offer TRICS magnificent slopes Give Sailplaners what want theyll come out also super support model man ufacturers dealers contributed over $4000 worth merchandise top ra dios Scale kits Wil said flier received some prize icing cake because everyone great time anyway Wil promised send complete report pictures next months column RC Giant Scale/de Vries Continued page 53 nique using plastic foam board Ken Otto elucidated techniques heat seating com ponents coatings white glue Vail Kinsey updated crowd silver-soldering techniques application silver soldering engine mufflers Leo Ford expert field demon strated fiberglass molding techniques including male female molds use release agents seminar topped off District IX Ra dio Frequency Coordinator Steve Mangles presented some enlightening facts about narrowband broadband transmitters receivers Theres lot recommend foilowing Chapter 90s lead scheduling such super show-andtell supreme example modelers helping modelers having ball doing recommending things club has taken plunge voted certify its RC transmitters May meeting certification orgy over 200 transmitters checked stickered Although isnt AMA requirement flying club field should now much safer electronically process combined use six carefully spaced concrete-block pilot positions should result mimmum radio interactive interference Now can convince people tum-on un less have pin latest Wendell Hostetlers Plans Works 1041 Heatherwood Lane Orrville OH 44667 big Fairchild PT-19 Its beautiful usual Wendell said moved bunch USAAF trainer drawings Toledo shin dig attesting excellence Bob Holman PO Box 741 San Bernardino CA 92402 producing some beauties World War subjects first SESA Dennis Bryant quarter-scale will knock sox off Dead-on scale shows mark master Scale builder drawings $2495 plus $3 P&H second new set plans Bob aimed true scratch-builder What hes done enlarge own Nieuport 17 drawings quarterscale show scale internal structure would adequate construct model truly dedicated builder plans $15 However Bob says hell send both SESA Nieuport 17 drawings customer $35posiaid Nicuport plans successful Bob mdiContinued page 144 September 1988 141
Edition: Model Aviation - 1988/09
Page Numbers: 50, 51, 135, 139, 140, 141
THE ULTIMATE Sailpianers art felt craft made modem all-glass technology completely formed molds Fi berglass fuselages have long made manner all-glass ship has molded wings tail surfaces well top F3B planes such built flown World Champions Rolf Decker Reinhard Liese made way Some commercially made Sailplanes like Rowings Impuls Fiberglasfiugels Albatross some big Scale Sallplanes like Roke DG 202 made molded glass too surpris ingly planes named made Germany Europeans have leaders technologyboth full-size Sailplanes models US needs catch up molded glass technology reason feel very fortunate have received step-by-step explanation molding glass expert Martin Bamert Martin Swiss citizen living temporarily Cal ifornia Martin sent written description molding included set 54 photos showing step process also sent samples wing stab sections molded carbon fiber ac cessory parts 23 pictures finished Glider named Speedo 87 plane de signed built Martin partner Jurg Wermuth lives Switzerland spection samples photographs Id say work Martin Jurg equal best being done today Truly ultimate modelers art Martins name sounds familiar may re call Dan Pruss article Slope flying Swiss Alps appeared May 1984 issue Model Aviation Dan told about traveling ca ble car up high mountain ski resort Swiss Sailplaners take over summer combi nation beautiful Scale Sailplanes /z- /3-scale combined gorgeous Alpine scen ery unforgettable Its ideal place slope fly Dan included several photos Martin flying own-design DG-100 428-meter span report Dans captions reads Martin Bainert considered best Switzerland free styles crowd Notice other Sailplanes parked Martin does thing Dans January 1985 RC Soaring column also photos Martin /3-scale DG-200 50-meter span Unfortunately isnt room column make complete showing Martins step-bystep construction photosbut have given few next best thing print pretty much Martins written descriptioneven cant see pictures Incidentally Martin sald spent 700 hours making molds alone Speedo 87 aerobatic Slope Racer discusses letter uses wing twisting roll control wings rotate slightly around wing joiner rod instead using alle rons roll plane Without further ado Martins letter report am going talk about two Gliders the Speedo 86 Speedo 87 Speedo 86 actually designed 1984 Jurg Wermuth friend Switzerland About three years ago Jurg sold two fuseHeres some process Martin Bamert uses produce molded Saliplanes First L aluminum framework surounds left wing master plug preparatory pouring first half mold L Object right another wing master plug resting atop finished half mold Com pleted wing mold R master form inside Big machine screws used jack mold halves apart theyre heavyl R&G Kunsttoff Tech nologie Swiss company supplies materiels Martin needed glass molding Theres lots information column Heres pair molded wing panels about born L Still encased molds see root-end wing L tip-end other R Roll control uses twist-wing method instead ailerons Wing panels pivot 8mm steel joiner rod Photo right shows Mar tin using spatula technique make stabilizer master mold visible 3-ft-long steel rod fastened top end work table attached end scraper maintains constant radius scraper drawn forward Stab mold plastic material 50 Model Aviation Radio Conoi Soaring Byron Blakeslee 3134 N Whrnebago Dr Sedalla CO 80135 lages valuable hints built two models Building model like ex actly easy task Because its small span 78 whole model has built very accu rately order achieve acceptable level performance glass fuselage white gel coat reinforced plenty carbon fiber Kevlar wing built foanilglass sheeted obechi wood glass cloth laid diagonally over foam cores increased torsional strength very important high-speed flights uses JW airfoil designed Jurg 10% thick slightly undercambered approaching trailing edge rudder well stabilizers sanded out piece balsawood Stab airfoil roughly NACA 0006 fully symmetrical Wing stabs rudder covered white polyester iron-on film gives model its final touch RC controls twist wings plus elevator rudder Building controls created some problems because space very limited fuselage though love working tweezers finally happy have completed installing three servos re cesver batteries first flights overwhelmed expecta tions flew slight upwind lightest Gliders fighting stay air wing loading 151 oz per sq ft quite accomplishment model also re sponded very well thermals easily climbed heights difficulty recognizing Speedo 86 completely aerobatic its element diving 600 800 ft straight down Nothing raffles shakes behaves stably predictably during high-speed flights Most kinetic energy can converted back height model has clocked over 100 mph have flown Speedo 86 over 120 hours have never crashed slope take results its attracting curious quisitive model pilots Conrjd page 135 New Fourmost Fillet QUICKCLEANEASY Stop messing around gummy fillers sticky putties Use Fourmost Fillet get clean perfect contour hassle Fourmost Fillet continuous strip vinyl preformed make perfect fillet Fillet may easily installed cyanoacrylate adhesives can finished either paint iron-on materials Fourmost Fillet also perfect wing saddle seats 2 sizes small No 128 medium No 129 Price 4 feet $350 Fourmost Products 4040 24th Ave Forest Grove OR 97116 503 357-2732 Carry Largest Only Stock Kraft Parts World .. Kraft alive working KRAFT MIDWEST Authorized warranty service ILL FLY WHAT FIX FREDUENCY CONVERSION $1000 Discount Regular Reparr Moot Make end Modete Converted Tuning Done Spectrum Analyzer Atso Service AU E/ 1iiiihi] Shad Only Full Time Servicenter Midwest ~W117 East Main St Northville Michigan 48167 Upper Lert IPhone 1-313-348-0085 Viee Meeterd Welcome r NE Vi f makers HEAD LOCK HEADLITE tm Features 1 STAINLESS STEEL HEAD LOCK tm glow plug connectoj strength corrosion free life 2FIELD REPLACEABLE 1 2 AH Nicad 3Built FULLY AUTOMATIC ON/OFF SWITCHto prevent short circuits pocket tool box 4LEO INDICATED charger available I-EAD-LLL. rri~$1695 FEAD-LITE m W/GHARGER-$2595 aeatable write direct add St 0045200 outse lSt MODEL PRODUCTS CORP PO BOX 100 ALLAMIJCHY NEW JERSEY 07820 September 1988 51 Molds used make Speedo 87 Slope Racer seen Above being sup ported designers/builders Jurg Wermuth L Martin Bamert MB initials tin Scene Swiss Alps Speedo 87 uses Multiplex Royal radio Below Rear servo drives pivoting wings short connecting rods Martin says plane will easily reach 150 mph dive Sorry say designers de cided model will sold/kitted US Pat4221452 os Pn RC Scale/Wischers Continued page 49 Consolidated Catalina both well-kept condition Two Royal Navy types also part show Fairey Swordfish early WV U vin tage flag-flying crew standing erect rear cockpit latest model Sea Harrier ar rived RNAS Yeovilton demonstrate slow hovering flight well high-speed passes time cover ears Another US product Fairchild A-b Thunderbolt II also known affectionately Warthog demonstrated extreme maneuverability its split ailerons able perform quite air show within small airports boundaries competition aerobatics enthusiasts flight routine one-of-a-kind Cran field A-i intended international aero batic contests design originated Cranfield College Industrial Technology Model flying United Kingdom trip visited three model flying sites first Tempsford disused WW II air base Only short length runway remains sur rounding farmland preserved RC model flying lady owns land also preserved another reason An old barn field national shrine base Westland Lysanders departed cross-Channel flights carrying supplies daring patriots supply continental underground operations dur ing WW II shown example RC flying management large club painted di visions pavement indicate model flier must stand avoid interference prob lems obligatory stand space flight also engine startup other activity tranamitter turned fellows extremely cautious about hazard radio interference Except feature could have watching sport flights right home four-stroke revolution has taken hold also few days later visited Chris Bradford Scale modeler flies both Control Line RC Marlborough flew Sopwith Pup typical grass field edge town powered English Laser four-stroke en gine Marlborough Model Hying Club has shelter house nearby also very smooth rugby field Control Line flying Laser quite impressive no nitro fuel will idie slow tick-over ac celerate full rpm hesitation Chris must impressed too has six Lasers both single-cylinder twins Chris Bradford also engine collector address 38 Barrow Close Marlborough Wiltshire 5N8 2BE Eng land has member UK World Championahip Scale teams 1984 1986 went westward visit James Pelly-Fry Scale modeler may remember published article Vickers Wellesley June 1988 issue Model Aviation new est Scale model deHavilland Devon twin ready fly test pilot Brian Taylor lives nearby local club smaller seem have no trouble interference flying site Merryfield little-used naval base 1-mile-long newly paved runway field has guard gate knows local modelers fly undisturbed end runway Another P-Si Information Bob Holman tells us Brian Taylors newest plan ready distribution Its P-51D Mustang designed 164 scale 60-size two-stroke 75/90 four-stroke engines Brian says no accurate scale drawing could found model built measurements photos Mustangs Imperial War Museum Dux ford England model weight just under 11 lb needed two ox tail ballast balance Adding tail weight Scale model rather rare occur rence used English Laser 75 four-stroke engine sufficient cooling chin air intake Exit air through scale exhaust pipes through fuselage radiator air outlet Span 69 An epoxy glass fuselage will available although drawing shows balsa construction An accessory package cludes detailed glass cowl hatch belly scoop canopy two drop tanks aluminum spin ner Bob Holman Plans PO Box 741 San Bernardino CA 92402 Paul Matt drawings Paul Joan Matt died last year concern among Scale modelers about what would become enor mous collection scale three-view drawings SunShine House Inc PO Box 2065 Terre Haute IN 47802 has acquired material Historical Aviation Album pub lished Paul Matt Included three- four-view scale drawings well last two Volumes 17 18 Historical Aviation Albums SunShine house has numerous books interest modelers Aviation Heritage Li brary series RC Soaring/Blakeslee Continued page 51 Surprised its great overall flight perform ance Jung decided join forces design Speedo 87 main reasons new de sign increase size times became problem recognlze correct position flying far away improve minor imper fections design utilize mod ern accurate building technology could accomplished employing molding tech nology using epoxy resins glass carbon Kevlar fibers Speedo 87 roughly 25% larger ample space inside fuselage cleaner flush wing-to-fuselage transition fiberglass sandwich glass-balsa-glass wing stabilator sections Because building molds very timeconsuming process Jung made fuselage mold did molds wings stabs special levers parts airfoil used RG 12A-18/90 18% camber 90% thick F3B airfoil designed Rudolf Girsberger Swiss model pilot stabs again used NACA 0006 airfoil order make wing molds first build positive formor master wing did covering foam cores prefabricated fiber glass skins skins epoxied cores clamped between two very accurate straight wooden blocks blocks look like 1 x 6 boards glued side-to-side form big butcher blocks six inches thick 18 wide five feet long have undoubtedly surfacemachined obtain flatness BB An obechi leading edge added sanded shape eight equally spaced stations made airfoil tem plates verili accuracy wing wings sprayed polyester surfacing maContinued page 139 Name Street Address City StateZip HoBD RNATIONAL INC September 1988 135 ZMA SECOND ANNUAL Memphis Belle Classic GIANT SCALE OCTOBER 15 & 16 1988FLY IN... SPONSORED BY THE MEMPHIS RADIO CONTROL CLUB MEMPHIS TN OAMA & IMAA SANCTIONED IMAA RULES WILL BE OBSERVED FOR FURTHER INFORMATION CALL RILL REATY EVENINGS 901-754-5083 DAYTIME 801780-7 180 MANLY WILLIAMS CD EVENINGS 9013881844 DAYTIME 9017812330 RC Soaring/Blakeslee Continued page 135 terial sanded eliminate imperfections Once master wings existed molding could proceed took place same wooden blocks originals pressed between wing placed within aluminum frame pieces covered gray molding resin Sorry can explain things very superficially otherwise would writing book top first coat thin glass layer added mixture resin quartz sand mechanically very stable material used fill frame addition two steel tubes fitted top frame hold mold together Once lower half mold existed upper half could built same way top lower part process done twice order come up molds both wings molds wing weigh about 120 lb finished molds polished treated separating agent white gel coat sprayed molds top glass cloth weighing 40 grams per sq meter added soaked epoxy resin 1/A balsawood skin put top soaked glass cloth setup placed polyethylene bag sealed vacuumed 24 hours After removal bag another layer glass cloth 120 grams per sq meter plus rein forcements put top balsa spars glued top lower sandwich wing subspars cut blue foam main spars consisted plywood carbon fibers Behind main spars place additional ballast weights main spar pretty involved because thickness air foil root 20mm dihedral built wing total dihedral 5 e edges carefully trimmed sharp knife wing halves glued together epoxy resin wing halves cant sanded prior gluing could dam age molds During gluing step molds securely clamped left leading-edgedownward epoxy would form nice fillet inside epoxy trailing edge thick ened wouldnt run down molds designed make wings span up 263 meters just cut ends off molded wing make required size experimenting different tip shapes though wing samples sent came ends first set have minor consistencies paint coverage can see what kind leading trailing edges well sur face quality can achieved using tech nology beauufulBB positive master form stabila tors done different way wings order achieve greater accuracy lead ing trailing edges spatula technique used much involved way building original return gives greatest possible accuracy current hightech F3B Gliders made way method starts very sturdy alumi num base plate exact length stab wing made end screwed air foil template exactly half airfoil show ing above base plate space between root tip airfoil templates base plate filled gray molding resin very straight rule resin dispersed within given space Starting trailing edge rule pulled forward toward leading edge drawing process repeated up 20 times amount resin scraped off decreases time root tip templates removed after resin cured aluminum frame bulit around base plate molding process pretty much same wings Since stabs symmetrical build upper lower section part Building actual stab done very much same fashion wing except balsawood used sandwich / thick mold fuselage explained before made friend Jurg mold rudder made exactly like stabs explained above cant explain exact malting fuselage mold Jurg has done job process commonly known anyway explain actual making fuselage top coat white gel coat polyes ter stinks terribly thin layer glass 40 gin per sq meter added before Kevlar cloth graphite fiber strands inserted Key lar about one-third lighter glass very difficult trim cut off carbon fibers added skinny tail sec tion fuselage absolute necessity high-speed flight model tends automati cally dive downward higher speeds reached stabilizers must exert downward force maintain level flight fuselage stiff enough will bend making control dif ficult make fuselage takes about eight hours Special parts Speedos made molded carbon fiber include stab crank lever incorporates two ball bearings wing joiner rod 8mm steel roller bearings ensure easy rotation wing panels first Speedo 87 models wings twisted small crank levers currently have gone directly driving leading edge pins Multiplex servo have used Multi plex Royal radio years am very satisfied really worried before maiden flight Speedo 87 after investing about 800 hours work worked project three months straight working regular job kind wonders what going hap pen flew beautifully major adjust ments After first few turns noticed its very stable uncritical flight behavior could barely stall did stall went smooth downward curve Its restitution ability convert speed height surprised because much better Speedo 86 very good itself Because its low-speed flying capabilities can take advantage smallest thermals updrafts its thin 9% airfoil also very fast Glider speeds up 150 mph easily reached Due its high penetration Speedo 87 also perfect aerobatics After about first two hours intensive fly ing could see easily outperformed its smaller brother Time after time Speedo 87 has admired amazed Glider pilots can say bragging pretty much outperforms Glider have ever flown owned within 17 years flying hope can see kind handcrafting involvement needed cant massproduce put realistic price tag model reasons Jurg have agreed sell Speedo 87 Thanks very much Martin Bamert tak ing time share important interest ing technology us hope descrip tion will encourage some Americans try du September 1988 139 plicate super-high-tech Sailpianes being made Europe F3B Britain recent issue Sean Walbanks White Sheet Club newsletter con tained very interesting article Bill Stephen Haley latest F3B design KB Merlin Stephen flew Merlin very creditable fourth place last years World Cham pionships Bill British ream manager came within few points repeating World Championsjust getting nipped wire Austrians Sean also edits Soaring column R/C Model World magazine well-known pursuing inside scoop model design ers Im sure Bill put arm him think youll enjoy story asked give story de velopment latest F3B model KB Merlin flown son Stephen fourth place 1987 World Champs West Germany first reaction far go back history Most competition model designers would proba bly agree good models normally devel oped over long period through series mod els model usually being modified version before no exception KB Merlin made some rather dras tic changes previous F3B models start Well feel obvious start ing point demise beloved Eppler 193 airfoil changing Quabeck section World Champs team trials expected take place late 1986 believe 193 finest all-around sections available Soaring fact placed fourth two pre vious team trials using section Having said time marches re alized although Thermal Distance tasks relatively easy 193 just fast enough modem international com petition mind built pair F3B mod els using Quabeck 210 section 2% camber 10% thick design span 116 straight-tapered nine-inch root seveninch tip chord models plug-on wings incorporating system using ballast tubes wing-joiner tubes %2-in ti tanium bar joiner effort try save weight decided eliminate spar using HT alloy tube spar reinforced carbon top bot tom wings covered epoxy/glass skins made sheet glass attached using ep oxy vacuum-bag system models corporated full-span flaperons operated two servos wing fact spar turned out far better theory practice crash 86 nation als split carbon-fibre away alloy tubes Stephens model later crash did same ie bond between tube carbon fiber wasnt good Per haps bad preparation tubes event never happy models al though definitely fast found banker event Duration task very much harder fact great difficulty thermaling properlythermal turns posing particular problems Having both European World Championships British team am con vinced British fliers best Thermal pi lots world dont have beat about bush Bill Tell us what thinkSW bad air lads will go looking lift hav ing found will work proven occasion Germany foreign fliers simply launched mod els sat wind hoped six min utes Enough prattle decided hold team trials May 87 rather Septem ber 1986 great lack success using Quabeck section felt another com plete rethink required com petitive time completed new fuse lage designed one-piece wing What wing section use started looking elusive worldbeater using very simple per formance criteria ie capable eight minutes flight average 24 laps Dis tance easy 16 seconds Speed timeall downdraughts Eventually came across Girsberger sections limited technical knowl edge decided RG 15 looked exactly what looking little naive thought discovered new wing section no else usinglittle did know outcome felt **it bust tlme either continue Quabeck section hope practice would make us competitive design build completely new models short time available hope flew off building board chose latter route Because felt either us successful getting British team would have time build spare models before World Championships July decided build two models trials large gamble failed perform no chance schedule programmed ensure least two models ready Christmas 86 would enable us get some practice incorporate modifications required other two models Once again theory proved better practiceand fact first ones completed month before team trialsnot enough time Wing construction again blue foam cores composite carbon-fibre spars time covered epoxy/glass skins applied wet plastic sheet still us ing vacuum-bag technique Ballast tubes incorporated wings access through small hatches wing top wing now one-piece except plug-on tips allow wings carried 10-ft model box plug-on tlps proved poor idea Controls ailerons rudder elevator trailing edge air brakes also incorporated arrester hook designed elec tronics expert Barry Mason springloaded rod projected straight down below cockpit actuated full rudder Barry fit ted pushbuttons onto transmitter gave us momentary full rudder release rod aimed wing loading 125 oz/sq ft planes fact turned out 135 oz/sq ft risk work worth Well af ter friend helped us CG use computer four models superb fly fact ways similar E193 ones have found Duration task rel atively easy achieve especially winch launches now getting about Distance task again very good feel need practice order improve As task has now altered man-on-man unlimited laps four minutes awful lot points can gained lost Much skill required now get best out model Distance Ballasting example now critical ever air speed has spot-on positioning course vital Lastly probably impor tant good teammates needed keep informed what other fliers ing task usually flown four group last task Speed KB Merlin fast Well Steve proved fastest fliers week Germany actually fast est days atrocious weather condi tions During practice before competition did run 165 seconds Simprops private fly ing field pretty obvious above delighted results efforts time published should well way 88 models leamed great deal 87 World Championships etc 140 Model Aviation MODELERS FIGHT-BACK TRUE-FACTS N EWSLETTER 444 Tired b ing ignorci editors Fed up wills never having questions answered FIGHT BAcIt Join us letter year s reader written publication spen letter communication between fellow modelers R$ fre flight 5 good thLsg iV TSonly wst Mississippi 2 Atvse limits models orflpiig sites 2 YhatLvfvrinsisrsisseiehst eye rktc IASstility toiecerd UIA Hhy AU LETTERS PUBUSI/AD $300 recieve sne copy $550 pub letter & copy $1950 4 issues & letters 1 yr Quarterly July OctJanApril THE PTERANODON PRESS 42 55 551 55 CA MASK CA glue works wonders building ntodels right Unfortunately gives enough fumes knock vulture off carcass modelers have suffered medical problems after inhaling CA fumes take chances special vapor respirator filters CA fumes soft face mask adjustable straps comfortably fits face sizes easy breathing valve allows prolonged use providing dependable filtering concentrations up 1000 PPM though rugged industrial mask light weight elimi nate fatigue Dont get gassed CA Get protected Order CA Mask today Just $1247 shipping cheaper hospital visit Money order Master Charge Visa include expiration date check allow 20 days clear Sorry no CODs Pelican Enterprises 2540 RIDGE ROAD LANSING ILLINOIS 60438 P S Send catalog modelers safety supplies RADIO CONTROL SHORT KITS FOR 25 TO 45 ENGINES VISIT OUR OUTLET STORE AT 15 MORGAN STREET IN CRYSTAL LAKE IL QUALITY PRODUCTS SINCE 1g64 THESE TWINS HAVE BEEN DESIGNED BY NATIONALS CHAMPION HAL PARENTI AND REFLECT HIGH CALIBER OF MODEL ENGINEERING THAT IS HARD TO BEAT AS WITH ALL OF OUR SHORT KITS THEY ARE BUILT AROUND FOAM CORE WING AND BOX FRAME FUSELAGE FOR SIMPLE BUT STURDY CONSTRUCTION THE SPECIALLY DESIGNED AIRFOILS AND GENEROUS TAIL AREAS GIVE THEM OUTSTANDING FLIGHTPERFORMANCE THROUGH OUT THE ENTIRE SPEED RANGE NEW P-38 LIGHTNING TWIN 706495 0 A-26 INVADER TWIN 685495 SHORT KITS INCWDE WING CORES CANOPIES COWLS PLANS ENGINE MOUNTS FIRE WALLS MOLDED MISC PARTS SHORT HARDWARE PACKAGE AND MATERIALS LIST FOR ADDITIONAL BALSA AND HARDWARE NEEDED ORDERING SEND CHECK OR MONEY ORDER FOR REOUIRED AMOUNT PLUS 450 PER KIT CANADIANS ADD $650 TO WING MFG PO BOX 33 CRYSTAL LAKE 1L60014 ILLINOIS RESI DENTS ADD 64% SALES TAX ALL ORDERS MUST REIN US FUNDS SEND 355 FDR PRODUCT CATALOG DESCRIRING OUR COMPLETE LINE OF FOAM WING CORES ACCESSORIES KITS TOOLS AND MUCH MORE sjh/A4 MEG WORLD WAR II FIGHTER SERIES AGM2 ZERO 54 SPAN 2995 P-40 TOMAHAWK 55 SPAN. 2995 P-39 A IRA COBRA 55 SPAN . 2995 P-Sb MUSTANG 54 SPAN . 2995 C202 FOLGORE 56 SPAN 5 FOCKE WULF 19054 SPAN. 2995 PHONE 815-459-0417 feel models can improved fair bit regret people dont have go F3B experience thrill pilot ing beautifully handling plane various tasks really belief F3B Formula Soaring hope few people will have go Sportsman TaskIF3B League introduced 1988 amazing few dedicated F3B fliers coun try Great BritainEd well international competitions Im sure would better still support come budding World Champs Have go dont know what youre missing Im thankful Bill Stephen Haley Great Britain took time share thoughts fellow sportsmen Thanks too Sean Walbank having news letter readand pass US Sailplaners ULF-1 plans article Wasserkuppe appeared May issue photos unusual glider known Ultra Light Footlaunch-One Quite few readers sent let ters requesting get plans infor mation interesting plane Unfortu nately didnt know time write plans MAs publisher Carl Wheeley did lot spadework located magic address Dieter Reich Heiner Neumann Anecho strasse No 16 D-8000 Munchen 82 West Ger ULF-1 plan pack consists 30 blueprints cutaway drawings illustrations English price 1986 360 Deutsch Marks about $215 current exchange rates source Carls information wants remind potential builders man-carrying craft footlaunch gliders just unforgiving life limb other aircraft advice anyone attempting fly should have prior struction training conventionally launched sailplanes Amen 1988 MARCS Sailplane Symposium Chairman Bill Vogelsang wants everyone know Symposium will held November 12-13 1988 Madison WI format will similar previous years talks table clinics etc may wish arrive early trip FAA Museum Oshkosh will arranged fall get-together becoming must Sailplaners Midwest others can fly weekend Anyone would like further information welcome write Bill 5933 Mayhill Dr Madison WI 53711 Slope Soaring news Im sure Sailplaners avidly reading Model Aviations new Slope Soaring column edited mark Triebes specialized Slope column first American magazines another sign progress making spreading gospel Person ally Im very encouraged positive things happening SoaringMarks new column being just example part future Ill concentrate flatland Soaring defer mark Slope matters may occasional exception special event feel close such Scale Slope Fun-Fly held Richland WA over Labor Day weekend Contest Direc tor Wil Byers phoned just before deadline time column let everyone know TRICS-sponsored Fun-Fly tremendous suc cess 58 fliers over 100 Scale planesboth regular Sailplanes Power Scale ships people came just spectate talk Scale Sailplanes 124 Saturday evening banquet turnout much much bigger us dared hope last year Bill Liscomb San Diego suggested such event Wil stepped forward offer TRICS magnificent slopes Give Sailplaners what want theyll come out also super support model man ufacturers dealers contributed over $4000 worth merchandise top ra dios Scale kits Wil said flier received some prize icing cake because everyone great time anyway Wil promised send complete report pictures next months column RC Giant Scale/de Vries Continued page 53 nique using plastic foam board Ken Otto elucidated techniques heat seating com ponents coatings white glue Vail Kinsey updated crowd silver-soldering techniques application silver soldering engine mufflers Leo Ford expert field demon strated fiberglass molding techniques including male female molds use release agents seminar topped off District IX Ra dio Frequency Coordinator Steve Mangles presented some enlightening facts about narrowband broadband transmitters receivers Theres lot recommend foilowing Chapter 90s lead scheduling such super show-andtell supreme example modelers helping modelers having ball doing recommending things club has taken plunge voted certify its RC transmitters May meeting certification orgy over 200 transmitters checked stickered Although isnt AMA requirement flying club field should now much safer electronically process combined use six carefully spaced concrete-block pilot positions should result mimmum radio interactive interference Now can convince people tum-on un less have pin latest Wendell Hostetlers Plans Works 1041 Heatherwood Lane Orrville OH 44667 big Fairchild PT-19 Its beautiful usual Wendell said moved bunch USAAF trainer drawings Toledo shin dig attesting excellence Bob Holman PO Box 741 San Bernardino CA 92402 producing some beauties World War subjects first SESA Dennis Bryant quarter-scale will knock sox off Dead-on scale shows mark master Scale builder drawings $2495 plus $3 P&H second new set plans Bob aimed true scratch-builder What hes done enlarge own Nieuport 17 drawings quarterscale show scale internal structure would adequate construct model truly dedicated builder plans $15 However Bob says hell send both SESA Nieuport 17 drawings customer $35posiaid Nicuport plans successful Bob mdiContinued page 144 September 1988 141
Edition: Model Aviation - 1988/09
Page Numbers: 50, 51, 135, 139, 140, 141
THE ULTIMATE Sailpianers art felt craft made modem all-glass technology completely formed molds Fi berglass fuselages have long made manner all-glass ship has molded wings tail surfaces well top F3B planes such built flown World Champions Rolf Decker Reinhard Liese made way Some commercially made Sailplanes like Rowings Impuls Fiberglasfiugels Albatross some big Scale Sallplanes like Roke DG 202 made molded glass too surpris ingly planes named made Germany Europeans have leaders technologyboth full-size Sailplanes models US needs catch up molded glass technology reason feel very fortunate have received step-by-step explanation molding glass expert Martin Bamert Martin Swiss citizen living temporarily Cal ifornia Martin sent written description molding included set 54 photos showing step process also sent samples wing stab sections molded carbon fiber ac cessory parts 23 pictures finished Glider named Speedo 87 plane de signed built Martin partner Jurg Wermuth lives Switzerland spection samples photographs Id say work Martin Jurg equal best being done today Truly ultimate modelers art Martins name sounds familiar may re call Dan Pruss article Slope flying Swiss Alps appeared May 1984 issue Model Aviation Dan told about traveling ca ble car up high mountain ski resort Swiss Sailplaners take over summer combi nation beautiful Scale Sailplanes /z- /3-scale combined gorgeous Alpine scen ery unforgettable Its ideal place slope fly Dan included several photos Martin flying own-design DG-100 428-meter span report Dans captions reads Martin Bainert considered best Switzerland free styles crowd Notice other Sailplanes parked Martin does thing Dans January 1985 RC Soaring column also photos Martin /3-scale DG-200 50-meter span Unfortunately isnt room column make complete showing Martins step-bystep construction photosbut have given few next best thing print pretty much Martins written descriptioneven cant see pictures Incidentally Martin sald spent 700 hours making molds alone Speedo 87 aerobatic Slope Racer discusses letter uses wing twisting roll control wings rotate slightly around wing joiner rod instead using alle rons roll plane Without further ado Martins letter report am going talk about two Gliders the Speedo 86 Speedo 87 Speedo 86 actually designed 1984 Jurg Wermuth friend Switzerland About three years ago Jurg sold two fuseHeres some process Martin Bamert uses produce molded Saliplanes First L aluminum framework surounds left wing master plug preparatory pouring first half mold L Object right another wing master plug resting atop finished half mold Com pleted wing mold R master form inside Big machine screws used jack mold halves apart theyre heavyl R&G Kunsttoff Tech nologie Swiss company supplies materiels Martin needed glass molding Theres lots information column Heres pair molded wing panels about born L Still encased molds see root-end wing L tip-end other R Roll control uses twist-wing method instead ailerons Wing panels pivot 8mm steel joiner rod Photo right shows Mar tin using spatula technique make stabilizer master mold visible 3-ft-long steel rod fastened top end work table attached end scraper maintains constant radius scraper drawn forward Stab mold plastic material 50 Model Aviation Radio Conoi Soaring Byron Blakeslee 3134 N Whrnebago Dr Sedalla CO 80135 lages valuable hints built two models Building model like ex actly easy task Because its small span 78 whole model has built very accu rately order achieve acceptable level performance glass fuselage white gel coat reinforced plenty carbon fiber Kevlar wing built foanilglass sheeted obechi wood glass cloth laid diagonally over foam cores increased torsional strength very important high-speed flights uses JW airfoil designed Jurg 10% thick slightly undercambered approaching trailing edge rudder well stabilizers sanded out piece balsawood Stab airfoil roughly NACA 0006 fully symmetrical Wing stabs rudder covered white polyester iron-on film gives model its final touch RC controls twist wings plus elevator rudder Building controls created some problems because space very limited fuselage though love working tweezers finally happy have completed installing three servos re cesver batteries first flights overwhelmed expecta tions flew slight upwind lightest Gliders fighting stay air wing loading 151 oz per sq ft quite accomplishment model also re sponded very well thermals easily climbed heights difficulty recognizing Speedo 86 completely aerobatic its element diving 600 800 ft straight down Nothing raffles shakes behaves stably predictably during high-speed flights Most kinetic energy can converted back height model has clocked over 100 mph have flown Speedo 86 over 120 hours have never crashed slope take results its attracting curious quisitive model pilots Conrjd page 135 New Fourmost Fillet QUICKCLEANEASY Stop messing around gummy fillers sticky putties Use Fourmost Fillet get clean perfect contour hassle Fourmost Fillet continuous strip vinyl preformed make perfect fillet Fillet may easily installed cyanoacrylate adhesives can finished either paint iron-on materials Fourmost Fillet also perfect wing saddle seats 2 sizes small No 128 medium No 129 Price 4 feet $350 Fourmost Products 4040 24th Ave Forest Grove OR 97116 503 357-2732 Carry Largest Only Stock Kraft Parts World .. Kraft alive working KRAFT MIDWEST Authorized warranty service ILL FLY WHAT FIX FREDUENCY CONVERSION $1000 Discount Regular Reparr Moot Make end Modete Converted Tuning Done Spectrum Analyzer Atso Service AU E/ 1iiiihi] Shad Only Full Time Servicenter Midwest ~W117 East Main St Northville Michigan 48167 Upper Lert IPhone 1-313-348-0085 Viee Meeterd Welcome r NE Vi f makers HEAD LOCK HEADLITE tm Features 1 STAINLESS STEEL HEAD LOCK tm glow plug connectoj strength corrosion free life 2FIELD REPLACEABLE 1 2 AH Nicad 3Built FULLY AUTOMATIC ON/OFF SWITCHto prevent short circuits pocket tool box 4LEO INDICATED charger available I-EAD-LLL. rri~$1695 FEAD-LITE m W/GHARGER-$2595 aeatable write direct add St 0045200 outse lSt MODEL PRODUCTS CORP PO BOX 100 ALLAMIJCHY NEW JERSEY 07820 September 1988 51 Molds used make Speedo 87 Slope Racer seen Above being sup ported designers/builders Jurg Wermuth L Martin Bamert MB initials tin Scene Swiss Alps Speedo 87 uses Multiplex Royal radio Below Rear servo drives pivoting wings short connecting rods Martin says plane will easily reach 150 mph dive Sorry say designers de cided model will sold/kitted US Pat4221452 os Pn RC Scale/Wischers Continued page 49 Consolidated Catalina both well-kept condition Two Royal Navy types also part show Fairey Swordfish early WV U vin tage flag-flying crew standing erect rear cockpit latest model Sea Harrier ar rived RNAS Yeovilton demonstrate slow hovering flight well high-speed passes time cover ears Another US product Fairchild A-b Thunderbolt II also known affectionately Warthog demonstrated extreme maneuverability its split ailerons able perform quite air show within small airports boundaries competition aerobatics enthusiasts flight routine one-of-a-kind Cran field A-i intended international aero batic contests design originated Cranfield College Industrial Technology Model flying United Kingdom trip visited three model flying sites first Tempsford disused WW II air base Only short length runway remains sur rounding farmland preserved RC model flying lady owns land also preserved another reason An old barn field national shrine base Westland Lysanders departed cross-Channel flights carrying supplies daring patriots supply continental underground operations dur ing WW II shown example RC flying management large club painted di visions pavement indicate model flier must stand avoid interference prob lems obligatory stand space flight also engine startup other activity tranamitter turned fellows extremely cautious about hazard radio interference Except feature could have watching sport flights right home four-stroke revolution has taken hold also few days later visited Chris Bradford Scale modeler flies both Control Line RC Marlborough flew Sopwith Pup typical grass field edge town powered English Laser four-stroke en gine Marlborough Model Hying Club has shelter house nearby also very smooth rugby field Control Line flying Laser quite impressive no nitro fuel will idie slow tick-over ac celerate full rpm hesitation Chris must impressed too has six Lasers both single-cylinder twins Chris Bradford also engine collector address 38 Barrow Close Marlborough Wiltshire 5N8 2BE Eng land has member UK World Championahip Scale teams 1984 1986 went westward visit James Pelly-Fry Scale modeler may remember published article Vickers Wellesley June 1988 issue Model Aviation new est Scale model deHavilland Devon twin ready fly test pilot Brian Taylor lives nearby local club smaller seem have no trouble interference flying site Merryfield little-used naval base 1-mile-long newly paved runway field has guard gate knows local modelers fly undisturbed end runway Another P-Si Information Bob Holman tells us Brian Taylors newest plan ready distribution Its P-51D Mustang designed 164 scale 60-size two-stroke 75/90 four-stroke engines Brian says no accurate scale drawing could found model built measurements photos Mustangs Imperial War Museum Dux ford England model weight just under 11 lb needed two ox tail ballast balance Adding tail weight Scale model rather rare occur rence used English Laser 75 four-stroke engine sufficient cooling chin air intake Exit air through scale exhaust pipes through fuselage radiator air outlet Span 69 An epoxy glass fuselage will available although drawing shows balsa construction An accessory package cludes detailed glass cowl hatch belly scoop canopy two drop tanks aluminum spin ner Bob Holman Plans PO Box 741 San Bernardino CA 92402 Paul Matt drawings Paul Joan Matt died last year concern among Scale modelers about what would become enor mous collection scale three-view drawings SunShine House Inc PO Box 2065 Terre Haute IN 47802 has acquired material Historical Aviation Album pub lished Paul Matt Included three- four-view scale drawings well last two Volumes 17 18 Historical Aviation Albums SunShine house has numerous books interest modelers Aviation Heritage Li brary series RC Soaring/Blakeslee Continued page 51 Surprised its great overall flight perform ance Jung decided join forces design Speedo 87 main reasons new de sign increase size times became problem recognlze correct position flying far away improve minor imper fections design utilize mod ern accurate building technology could accomplished employing molding tech nology using epoxy resins glass carbon Kevlar fibers Speedo 87 roughly 25% larger ample space inside fuselage cleaner flush wing-to-fuselage transition fiberglass sandwich glass-balsa-glass wing stabilator sections Because building molds very timeconsuming process Jung made fuselage mold did molds wings stabs special levers parts airfoil used RG 12A-18/90 18% camber 90% thick F3B airfoil designed Rudolf Girsberger Swiss model pilot stabs again used NACA 0006 airfoil order make wing molds first build positive formor master wing did covering foam cores prefabricated fiber glass skins skins epoxied cores clamped between two very accurate straight wooden blocks blocks look like 1 x 6 boards glued side-to-side form big butcher blocks six inches thick 18 wide five feet long have undoubtedly surfacemachined obtain flatness BB An obechi leading edge added sanded shape eight equally spaced stations made airfoil tem plates verili accuracy wing wings sprayed polyester surfacing maContinued page 139 Name Street Address City StateZip HoBD RNATIONAL INC September 1988 135 ZMA SECOND ANNUAL Memphis Belle Classic GIANT SCALE OCTOBER 15 & 16 1988FLY IN... SPONSORED BY THE MEMPHIS RADIO CONTROL CLUB MEMPHIS TN OAMA & IMAA SANCTIONED IMAA RULES WILL BE OBSERVED FOR FURTHER INFORMATION CALL RILL REATY EVENINGS 901-754-5083 DAYTIME 801780-7 180 MANLY WILLIAMS CD EVENINGS 9013881844 DAYTIME 9017812330 RC Soaring/Blakeslee Continued page 135 terial sanded eliminate imperfections Once master wings existed molding could proceed took place same wooden blocks originals pressed between wing placed within aluminum frame pieces covered gray molding resin Sorry can explain things very superficially otherwise would writing book top first coat thin glass layer added mixture resin quartz sand mechanically very stable material used fill frame addition two steel tubes fitted top frame hold mold together Once lower half mold existed upper half could built same way top lower part process done twice order come up molds both wings molds wing weigh about 120 lb finished molds polished treated separating agent white gel coat sprayed molds top glass cloth weighing 40 grams per sq meter added soaked epoxy resin 1/A balsawood skin put top soaked glass cloth setup placed polyethylene bag sealed vacuumed 24 hours After removal bag another layer glass cloth 120 grams per sq meter plus rein forcements put top balsa spars glued top lower sandwich wing subspars cut blue foam main spars consisted plywood carbon fibers Behind main spars place additional ballast weights main spar pretty involved because thickness air foil root 20mm dihedral built wing total dihedral 5 e edges carefully trimmed sharp knife wing halves glued together epoxy resin wing halves cant sanded prior gluing could dam age molds During gluing step molds securely clamped left leading-edgedownward epoxy would form nice fillet inside epoxy trailing edge thick ened wouldnt run down molds designed make wings span up 263 meters just cut ends off molded wing make required size experimenting different tip shapes though wing samples sent came ends first set have minor consistencies paint coverage can see what kind leading trailing edges well sur face quality can achieved using tech nology beauufulBB positive master form stabila tors done different way wings order achieve greater accuracy lead ing trailing edges spatula technique used much involved way building original return gives greatest possible accuracy current hightech F3B Gliders made way method starts very sturdy alumi num base plate exact length stab wing made end screwed air foil template exactly half airfoil show ing above base plate space between root tip airfoil templates base plate filled gray molding resin very straight rule resin dispersed within given space Starting trailing edge rule pulled forward toward leading edge drawing process repeated up 20 times amount resin scraped off decreases time root tip templates removed after resin cured aluminum frame bulit around base plate molding process pretty much same wings Since stabs symmetrical build upper lower section part Building actual stab done very much same fashion wing except balsawood used sandwich / thick mold fuselage explained before made friend Jurg mold rudder made exactly like stabs explained above cant explain exact malting fuselage mold Jurg has done job process commonly known anyway explain actual making fuselage top coat white gel coat polyes ter stinks terribly thin layer glass 40 gin per sq meter added before Kevlar cloth graphite fiber strands inserted Key lar about one-third lighter glass very difficult trim cut off carbon fibers added skinny tail sec tion fuselage absolute necessity high-speed flight model tends automati cally dive downward higher speeds reached stabilizers must exert downward force maintain level flight fuselage stiff enough will bend making control dif ficult make fuselage takes about eight hours Special parts Speedos made molded carbon fiber include stab crank lever incorporates two ball bearings wing joiner rod 8mm steel roller bearings ensure easy rotation wing panels first Speedo 87 models wings twisted small crank levers currently have gone directly driving leading edge pins Multiplex servo have used Multi plex Royal radio years am very satisfied really worried before maiden flight Speedo 87 after investing about 800 hours work worked project three months straight working regular job kind wonders what going hap pen flew beautifully major adjust ments After first few turns noticed its very stable uncritical flight behavior could barely stall did stall went smooth downward curve Its restitution ability convert speed height surprised because much better Speedo 86 very good itself Because its low-speed flying capabilities can take advantage smallest thermals updrafts its thin 9% airfoil also very fast Glider speeds up 150 mph easily reached Due its high penetration Speedo 87 also perfect aerobatics After about first two hours intensive fly ing could see easily outperformed its smaller brother Time after time Speedo 87 has admired amazed Glider pilots can say bragging pretty much outperforms Glider have ever flown owned within 17 years flying hope can see kind handcrafting involvement needed cant massproduce put realistic price tag model reasons Jurg have agreed sell Speedo 87 Thanks very much Martin Bamert tak ing time share important interest ing technology us hope descrip tion will encourage some Americans try du September 1988 139 plicate super-high-tech Sailpianes being made Europe F3B Britain recent issue Sean Walbanks White Sheet Club newsletter con tained very interesting article Bill Stephen Haley latest F3B design KB Merlin Stephen flew Merlin very creditable fourth place last years World Cham pionships Bill British ream manager came within few points repeating World Championsjust getting nipped wire Austrians Sean also edits Soaring column R/C Model World magazine well-known pursuing inside scoop model design ers Im sure Bill put arm him think youll enjoy story asked give story de velopment latest F3B model KB Merlin flown son Stephen fourth place 1987 World Champs West Germany first reaction far go back history Most competition model designers would proba bly agree good models normally devel oped over long period through series mod els model usually being modified version before no exception KB Merlin made some rather dras tic changes previous F3B models start Well feel obvious start ing point demise beloved Eppler 193 airfoil changing Quabeck section World Champs team trials expected take place late 1986 believe 193 finest all-around sections available Soaring fact placed fourth two pre vious team trials using section Having said time marches re alized although Thermal Distance tasks relatively easy 193 just fast enough modem international com petition mind built pair F3B mod els using Quabeck 210 section 2% camber 10% thick design span 116 straight-tapered nine-inch root seveninch tip chord models plug-on wings incorporating system using ballast tubes wing-joiner tubes %2-in ti tanium bar joiner effort try save weight decided eliminate spar using HT alloy tube spar reinforced carbon top bot tom wings covered epoxy/glass skins made sheet glass attached using ep oxy vacuum-bag system models corporated full-span flaperons operated two servos wing fact spar turned out far better theory practice crash 86 nation als split carbon-fibre away alloy tubes Stephens model later crash did same ie bond between tube carbon fiber wasnt good Per haps bad preparation tubes event never happy models al though definitely fast found banker event Duration task very much harder fact great difficulty thermaling properlythermal turns posing particular problems Having both European World Championships British team am con vinced British fliers best Thermal pi lots world dont have beat about bush Bill Tell us what thinkSW bad air lads will go looking lift hav ing found will work proven occasion Germany foreign fliers simply launched mod els sat wind hoped six min utes Enough prattle decided hold team trials May 87 rather Septem ber 1986 great lack success using Quabeck section felt another com plete rethink required com petitive time completed new fuse lage designed one-piece wing What wing section use started looking elusive worldbeater using very simple per formance criteria ie capable eight minutes flight average 24 laps Dis tance easy 16 seconds Speed timeall downdraughts Eventually came across Girsberger sections limited technical knowl edge decided RG 15 looked exactly what looking little naive thought discovered new wing section no else usinglittle did know outcome felt **it bust tlme either continue Quabeck section hope practice would make us competitive design build completely new models short time available hope flew off building board chose latter route Because felt either us successful getting British team would have time build spare models before World Championships July decided build two models trials large gamble failed perform no chance schedule programmed ensure least two models ready Christmas 86 would enable us get some practice incorporate modifications required other two models Once again theory proved better practiceand fact first ones completed month before team trialsnot enough time Wing construction again blue foam cores composite carbon-fibre spars time covered epoxy/glass skins applied wet plastic sheet still us ing vacuum-bag technique Ballast tubes incorporated wings access through small hatches wing top wing now one-piece except plug-on tips allow wings carried 10-ft model box plug-on tlps proved poor idea Controls ailerons rudder elevator trailing edge air brakes also incorporated arrester hook designed elec tronics expert Barry Mason springloaded rod projected straight down below cockpit actuated full rudder Barry fit ted pushbuttons onto transmitter gave us momentary full rudder release rod aimed wing loading 125 oz/sq ft planes fact turned out 135 oz/sq ft risk work worth Well af ter friend helped us CG use computer four models superb fly fact ways similar E193 ones have found Duration task rel atively easy achieve especially winch launches now getting about Distance task again very good feel need practice order improve As task has now altered man-on-man unlimited laps four minutes awful lot points can gained lost Much skill required now get best out model Distance Ballasting example now critical ever air speed has spot-on positioning course vital Lastly probably impor tant good teammates needed keep informed what other fliers ing task usually flown four group last task Speed KB Merlin fast Well Steve proved fastest fliers week Germany actually fast est days atrocious weather condi tions During practice before competition did run 165 seconds Simprops private fly ing field pretty obvious above delighted results efforts time published should well way 88 models leamed great deal 87 World Championships etc 140 Model Aviation MODELERS FIGHT-BACK TRUE-FACTS N EWSLETTER 444 Tired b ing ignorci editors Fed up wills never having questions answered FIGHT BAcIt Join us letter year s reader written publication spen letter communication between fellow modelers R$ fre flight 5 good thLsg iV TSonly wst Mississippi 2 Atvse limits models orflpiig sites 2 YhatLvfvrinsisrsisseiehst eye rktc IASstility toiecerd UIA Hhy AU LETTERS PUBUSI/AD $300 recieve sne copy $550 pub letter & copy $1950 4 issues & letters 1 yr Quarterly July OctJanApril THE PTERANODON PRESS 42 55 551 55 CA MASK CA glue works wonders building ntodels right Unfortunately gives enough fumes knock vulture off carcass modelers have suffered medical problems after inhaling CA fumes take chances special vapor respirator filters CA fumes soft face mask adjustable straps comfortably fits face sizes easy breathing valve allows prolonged use providing dependable filtering concentrations up 1000 PPM though rugged industrial mask light weight elimi nate fatigue Dont get gassed CA Get protected Order CA Mask today Just $1247 shipping cheaper hospital visit Money order Master Charge Visa include expiration date check allow 20 days clear Sorry no CODs Pelican Enterprises 2540 RIDGE ROAD LANSING ILLINOIS 60438 P S Send catalog modelers safety supplies RADIO CONTROL SHORT KITS FOR 25 TO 45 ENGINES VISIT OUR OUTLET STORE AT 15 MORGAN STREET IN CRYSTAL LAKE IL QUALITY PRODUCTS SINCE 1g64 THESE TWINS HAVE BEEN DESIGNED BY NATIONALS CHAMPION HAL PARENTI AND REFLECT HIGH CALIBER OF MODEL ENGINEERING THAT IS HARD TO BEAT AS WITH ALL OF OUR SHORT KITS THEY ARE BUILT AROUND FOAM CORE WING AND BOX FRAME FUSELAGE FOR SIMPLE BUT STURDY CONSTRUCTION THE SPECIALLY DESIGNED AIRFOILS AND GENEROUS TAIL AREAS GIVE THEM OUTSTANDING FLIGHTPERFORMANCE THROUGH OUT THE ENTIRE SPEED RANGE NEW P-38 LIGHTNING TWIN 706495 0 A-26 INVADER TWIN 685495 SHORT KITS INCWDE WING CORES CANOPIES COWLS PLANS ENGINE MOUNTS FIRE WALLS MOLDED MISC PARTS SHORT HARDWARE PACKAGE AND MATERIALS LIST FOR ADDITIONAL BALSA AND HARDWARE NEEDED ORDERING SEND CHECK OR MONEY ORDER FOR REOUIRED AMOUNT PLUS 450 PER KIT CANADIANS ADD $650 TO WING MFG PO BOX 33 CRYSTAL LAKE 1L60014 ILLINOIS RESI DENTS ADD 64% SALES TAX ALL ORDERS MUST REIN US FUNDS SEND 355 FDR PRODUCT CATALOG DESCRIRING OUR COMPLETE LINE OF FOAM WING CORES ACCESSORIES KITS TOOLS AND MUCH MORE sjh/A4 MEG WORLD WAR II FIGHTER SERIES AGM2 ZERO 54 SPAN 2995 P-40 TOMAHAWK 55 SPAN. 2995 P-39 A IRA COBRA 55 SPAN . 2995 P-Sb MUSTANG 54 SPAN . 2995 C202 FOLGORE 56 SPAN 5 FOCKE WULF 19054 SPAN. 2995 PHONE 815-459-0417 feel models can improved fair bit regret people dont have go F3B experience thrill pilot ing beautifully handling plane various tasks really belief F3B Formula Soaring hope few people will have go Sportsman TaskIF3B League introduced 1988 amazing few dedicated F3B fliers coun try Great BritainEd well international competitions Im sure would better still support come budding World Champs Have go dont know what youre missing Im thankful Bill Stephen Haley Great Britain took time share thoughts fellow sportsmen Thanks too Sean Walbank having news letter readand pass US Sailplaners ULF-1 plans article Wasserkuppe appeared May issue photos unusual glider known Ultra Light Footlaunch-One Quite few readers sent let ters requesting get plans infor mation interesting plane Unfortu nately didnt know time write plans MAs publisher Carl Wheeley did lot spadework located magic address Dieter Reich Heiner Neumann Anecho strasse No 16 D-8000 Munchen 82 West Ger ULF-1 plan pack consists 30 blueprints cutaway drawings illustrations English price 1986 360 Deutsch Marks about $215 current exchange rates source Carls information wants remind potential builders man-carrying craft footlaunch gliders just unforgiving life limb other aircraft advice anyone attempting fly should have prior struction training conventionally launched sailplanes Amen 1988 MARCS Sailplane Symposium Chairman Bill Vogelsang wants everyone know Symposium will held November 12-13 1988 Madison WI format will similar previous years talks table clinics etc may wish arrive early trip FAA Museum Oshkosh will arranged fall get-together becoming must Sailplaners Midwest others can fly weekend Anyone would like further information welcome write Bill 5933 Mayhill Dr Madison WI 53711 Slope Soaring news Im sure Sailplaners avidly reading Model Aviations new Slope Soaring column edited mark Triebes specialized Slope column first American magazines another sign progress making spreading gospel Person ally Im very encouraged positive things happening SoaringMarks new column being just example part future Ill concentrate flatland Soaring defer mark Slope matters may occasional exception special event feel close such Scale Slope Fun-Fly held Richland WA over Labor Day weekend Contest Direc tor Wil Byers phoned just before deadline time column let everyone know TRICS-sponsored Fun-Fly tremendous suc cess 58 fliers over 100 Scale planesboth regular Sailplanes Power Scale ships people came just spectate talk Scale Sailplanes 124 Saturday evening banquet turnout much much bigger us dared hope last year Bill Liscomb San Diego suggested such event Wil stepped forward offer TRICS magnificent slopes Give Sailplaners what want theyll come out also super support model man ufacturers dealers contributed over $4000 worth merchandise top ra dios Scale kits Wil said flier received some prize icing cake because everyone great time anyway Wil promised send complete report pictures next months column RC Giant Scale/de Vries Continued page 53 nique using plastic foam board Ken Otto elucidated techniques heat seating com ponents coatings white glue Vail Kinsey updated crowd silver-soldering techniques application silver soldering engine mufflers Leo Ford expert field demon strated fiberglass molding techniques including male female molds use release agents seminar topped off District IX Ra dio Frequency Coordinator Steve Mangles presented some enlightening facts about narrowband broadband transmitters receivers Theres lot recommend foilowing Chapter 90s lead scheduling such super show-andtell supreme example modelers helping modelers having ball doing recommending things club has taken plunge voted certify its RC transmitters May meeting certification orgy over 200 transmitters checked stickered Although isnt AMA requirement flying club field should now much safer electronically process combined use six carefully spaced concrete-block pilot positions should result mimmum radio interactive interference Now can convince people tum-on un less have pin latest Wendell Hostetlers Plans Works 1041 Heatherwood Lane Orrville OH 44667 big Fairchild PT-19 Its beautiful usual Wendell said moved bunch USAAF trainer drawings Toledo shin dig attesting excellence Bob Holman PO Box 741 San Bernardino CA 92402 producing some beauties World War subjects first SESA Dennis Bryant quarter-scale will knock sox off Dead-on scale shows mark master Scale builder drawings $2495 plus $3 P&H second new set plans Bob aimed true scratch-builder What hes done enlarge own Nieuport 17 drawings quarterscale show scale internal structure would adequate construct model truly dedicated builder plans $15 However Bob says hell send both SESA Nieuport 17 drawings customer $35posiaid Nicuport plans successful Bob mdiContinued page 144 September 1988 141
Edition: Model Aviation - 1988/09
Page Numbers: 50, 51, 135, 139, 140, 141
THE ULTIMATE Sailpianers art felt craft made modem all-glass technology completely formed molds Fi berglass fuselages have long made manner all-glass ship has molded wings tail surfaces well top F3B planes such built flown World Champions Rolf Decker Reinhard Liese made way Some commercially made Sailplanes like Rowings Impuls Fiberglasfiugels Albatross some big Scale Sallplanes like Roke DG 202 made molded glass too surpris ingly planes named made Germany Europeans have leaders technologyboth full-size Sailplanes models US needs catch up molded glass technology reason feel very fortunate have received step-by-step explanation molding glass expert Martin Bamert Martin Swiss citizen living temporarily Cal ifornia Martin sent written description molding included set 54 photos showing step process also sent samples wing stab sections molded carbon fiber ac cessory parts 23 pictures finished Glider named Speedo 87 plane de signed built Martin partner Jurg Wermuth lives Switzerland spection samples photographs Id say work Martin Jurg equal best being done today Truly ultimate modelers art Martins name sounds familiar may re call Dan Pruss article Slope flying Swiss Alps appeared May 1984 issue Model Aviation Dan told about traveling ca ble car up high mountain ski resort Swiss Sailplaners take over summer combi nation beautiful Scale Sailplanes /z- /3-scale combined gorgeous Alpine scen ery unforgettable Its ideal place slope fly Dan included several photos Martin flying own-design DG-100 428-meter span report Dans captions reads Martin Bainert considered best Switzerland free styles crowd Notice other Sailplanes parked Martin does thing Dans January 1985 RC Soaring column also photos Martin /3-scale DG-200 50-meter span Unfortunately isnt room column make complete showing Martins step-bystep construction photosbut have given few next best thing print pretty much Martins written descriptioneven cant see pictures Incidentally Martin sald spent 700 hours making molds alone Speedo 87 aerobatic Slope Racer discusses letter uses wing twisting roll control wings rotate slightly around wing joiner rod instead using alle rons roll plane Without further ado Martins letter report am going talk about two Gliders the Speedo 86 Speedo 87 Speedo 86 actually designed 1984 Jurg Wermuth friend Switzerland About three years ago Jurg sold two fuseHeres some process Martin Bamert uses produce molded Saliplanes First L aluminum framework surounds left wing master plug preparatory pouring first half mold L Object right another wing master plug resting atop finished half mold Com pleted wing mold R master form inside Big machine screws used jack mold halves apart theyre heavyl R&G Kunsttoff Tech nologie Swiss company supplies materiels Martin needed glass molding Theres lots information column Heres pair molded wing panels about born L Still encased molds see root-end wing L tip-end other R Roll control uses twist-wing method instead ailerons Wing panels pivot 8mm steel joiner rod Photo right shows Mar tin using spatula technique make stabilizer master mold visible 3-ft-long steel rod fastened top end work table attached end scraper maintains constant radius scraper drawn forward Stab mold plastic material 50 Model Aviation Radio Conoi Soaring Byron Blakeslee 3134 N Whrnebago Dr Sedalla CO 80135 lages valuable hints built two models Building model like ex actly easy task Because its small span 78 whole model has built very accu rately order achieve acceptable level performance glass fuselage white gel coat reinforced plenty carbon fiber Kevlar wing built foanilglass sheeted obechi wood glass cloth laid diagonally over foam cores increased torsional strength very important high-speed flights uses JW airfoil designed Jurg 10% thick slightly undercambered approaching trailing edge rudder well stabilizers sanded out piece balsawood Stab airfoil roughly NACA 0006 fully symmetrical Wing stabs rudder covered white polyester iron-on film gives model its final touch RC controls twist wings plus elevator rudder Building controls created some problems because space very limited fuselage though love working tweezers finally happy have completed installing three servos re cesver batteries first flights overwhelmed expecta tions flew slight upwind lightest Gliders fighting stay air wing loading 151 oz per sq ft quite accomplishment model also re sponded very well thermals easily climbed heights difficulty recognizing Speedo 86 completely aerobatic its element diving 600 800 ft straight down Nothing raffles shakes behaves stably predictably during high-speed flights Most kinetic energy can converted back height model has clocked over 100 mph have flown Speedo 86 over 120 hours have never crashed slope take results its attracting curious quisitive model pilots Conrjd page 135 New Fourmost Fillet QUICKCLEANEASY Stop messing around gummy fillers sticky putties Use Fourmost Fillet get clean perfect contour hassle Fourmost Fillet continuous strip vinyl preformed make perfect fillet Fillet may easily installed cyanoacrylate adhesives can finished either paint iron-on materials Fourmost Fillet also perfect wing saddle seats 2 sizes small No 128 medium No 129 Price 4 feet $350 Fourmost Products 4040 24th Ave Forest Grove OR 97116 503 357-2732 Carry Largest Only Stock Kraft Parts World .. Kraft alive working KRAFT MIDWEST Authorized warranty service ILL FLY WHAT FIX FREDUENCY CONVERSION $1000 Discount Regular Reparr Moot Make end Modete Converted Tuning Done Spectrum Analyzer Atso Service AU E/ 1iiiihi] Shad Only Full Time Servicenter Midwest ~W117 East Main St Northville Michigan 48167 Upper Lert IPhone 1-313-348-0085 Viee Meeterd Welcome r NE Vi f makers HEAD LOCK HEADLITE tm Features 1 STAINLESS STEEL HEAD LOCK tm glow plug connectoj strength corrosion free life 2FIELD REPLACEABLE 1 2 AH Nicad 3Built FULLY AUTOMATIC ON/OFF SWITCHto prevent short circuits pocket tool box 4LEO INDICATED charger available I-EAD-LLL. rri~$1695 FEAD-LITE m W/GHARGER-$2595 aeatable write direct add St 0045200 outse lSt MODEL PRODUCTS CORP PO BOX 100 ALLAMIJCHY NEW JERSEY 07820 September 1988 51 Molds used make Speedo 87 Slope Racer seen Above being sup ported designers/builders Jurg Wermuth L Martin Bamert MB initials tin Scene Swiss Alps Speedo 87 uses Multiplex Royal radio Below Rear servo drives pivoting wings short connecting rods Martin says plane will easily reach 150 mph dive Sorry say designers de cided model will sold/kitted US Pat4221452 os Pn RC Scale/Wischers Continued page 49 Consolidated Catalina both well-kept condition Two Royal Navy types also part show Fairey Swordfish early WV U vin tage flag-flying crew standing erect rear cockpit latest model Sea Harrier ar rived RNAS Yeovilton demonstrate slow hovering flight well high-speed passes time cover ears Another US product Fairchild A-b Thunderbolt II also known affectionately Warthog demonstrated extreme maneuverability its split ailerons able perform quite air show within small airports boundaries competition aerobatics enthusiasts flight routine one-of-a-kind Cran field A-i intended international aero batic contests design originated Cranfield College Industrial Technology Model flying United Kingdom trip visited three model flying sites first Tempsford disused WW II air base Only short length runway remains sur rounding farmland preserved RC model flying lady owns land also preserved another reason An old barn field national shrine base Westland Lysanders departed cross-Channel flights carrying supplies daring patriots supply continental underground operations dur ing WW II shown example RC flying management large club painted di visions pavement indicate model flier must stand avoid interference prob lems obligatory stand space flight also engine startup other activity tranamitter turned fellows extremely cautious about hazard radio interference Except feature could have watching sport flights right home four-stroke revolution has taken hold also few days later visited Chris Bradford Scale modeler flies both Control Line RC Marlborough flew Sopwith Pup typical grass field edge town powered English Laser four-stroke en gine Marlborough Model Hying Club has shelter house nearby also very smooth rugby field Control Line flying Laser quite impressive no nitro fuel will idie slow tick-over ac celerate full rpm hesitation Chris must impressed too has six Lasers both single-cylinder twins Chris Bradford also engine collector address 38 Barrow Close Marlborough Wiltshire 5N8 2BE Eng land has member UK World Championahip Scale teams 1984 1986 went westward visit James Pelly-Fry Scale modeler may remember published article Vickers Wellesley June 1988 issue Model Aviation new est Scale model deHavilland Devon twin ready fly test pilot Brian Taylor lives nearby local club smaller seem have no trouble interference flying site Merryfield little-used naval base 1-mile-long newly paved runway field has guard gate knows local modelers fly undisturbed end runway Another P-Si Information Bob Holman tells us Brian Taylors newest plan ready distribution Its P-51D Mustang designed 164 scale 60-size two-stroke 75/90 four-stroke engines Brian says no accurate scale drawing could found model built measurements photos Mustangs Imperial War Museum Dux ford England model weight just under 11 lb needed two ox tail ballast balance Adding tail weight Scale model rather rare occur rence used English Laser 75 four-stroke engine sufficient cooling chin air intake Exit air through scale exhaust pipes through fuselage radiator air outlet Span 69 An epoxy glass fuselage will available although drawing shows balsa construction An accessory package cludes detailed glass cowl hatch belly scoop canopy two drop tanks aluminum spin ner Bob Holman Plans PO Box 741 San Bernardino CA 92402 Paul Matt drawings Paul Joan Matt died last year concern among Scale modelers about what would become enor mous collection scale three-view drawings SunShine House Inc PO Box 2065 Terre Haute IN 47802 has acquired material Historical Aviation Album pub lished Paul Matt Included three- four-view scale drawings well last two Volumes 17 18 Historical Aviation Albums SunShine house has numerous books interest modelers Aviation Heritage Li brary series RC Soaring/Blakeslee Continued page 51 Surprised its great overall flight perform ance Jung decided join forces design Speedo 87 main reasons new de sign increase size times became problem recognlze correct position flying far away improve minor imper fections design utilize mod ern accurate building technology could accomplished employing molding tech nology using epoxy resins glass carbon Kevlar fibers Speedo 87 roughly 25% larger ample space inside fuselage cleaner flush wing-to-fuselage transition fiberglass sandwich glass-balsa-glass wing stabilator sections Because building molds very timeconsuming process Jung made fuselage mold did molds wings stabs special levers parts airfoil used RG 12A-18/90 18% camber 90% thick F3B airfoil designed Rudolf Girsberger Swiss model pilot stabs again used NACA 0006 airfoil order make wing molds first build positive formor master wing did covering foam cores prefabricated fiber glass skins skins epoxied cores clamped between two very accurate straight wooden blocks blocks look like 1 x 6 boards glued side-to-side form big butcher blocks six inches thick 18 wide five feet long have undoubtedly surfacemachined obtain flatness BB An obechi leading edge added sanded shape eight equally spaced stations made airfoil tem plates verili accuracy wing wings sprayed polyester surfacing maContinued page 139 Name Street Address City StateZip HoBD RNATIONAL INC September 1988 135 ZMA SECOND ANNUAL Memphis Belle Classic GIANT SCALE OCTOBER 15 & 16 1988FLY IN... SPONSORED BY THE MEMPHIS RADIO CONTROL CLUB MEMPHIS TN OAMA & IMAA SANCTIONED IMAA RULES WILL BE OBSERVED FOR FURTHER INFORMATION CALL RILL REATY EVENINGS 901-754-5083 DAYTIME 801780-7 180 MANLY WILLIAMS CD EVENINGS 9013881844 DAYTIME 9017812330 RC Soaring/Blakeslee Continued page 135 terial sanded eliminate imperfections Once master wings existed molding could proceed took place same wooden blocks originals pressed between wing placed within aluminum frame pieces covered gray molding resin Sorry can explain things very superficially otherwise would writing book top first coat thin glass layer added mixture resin quartz sand mechanically very stable material used fill frame addition two steel tubes fitted top frame hold mold together Once lower half mold existed upper half could built same way top lower part process done twice order come up molds both wings molds wing weigh about 120 lb finished molds polished treated separating agent white gel coat sprayed molds top glass cloth weighing 40 grams per sq meter added soaked epoxy resin 1/A balsawood skin put top soaked glass cloth setup placed polyethylene bag sealed vacuumed 24 hours After removal bag another layer glass cloth 120 grams per sq meter plus rein forcements put top balsa spars glued top lower sandwich wing subspars cut blue foam main spars consisted plywood carbon fibers Behind main spars place additional ballast weights main spar pretty involved because thickness air foil root 20mm dihedral built wing total dihedral 5 e edges carefully trimmed sharp knife wing halves glued together epoxy resin wing halves cant sanded prior gluing could dam age molds During gluing step molds securely clamped left leading-edgedownward epoxy would form nice fillet inside epoxy trailing edge thick ened wouldnt run down molds designed make wings span up 263 meters just cut ends off molded wing make required size experimenting different tip shapes though wing samples sent came ends first set have minor consistencies paint coverage can see what kind leading trailing edges well sur face quality can achieved using tech nology beauufulBB positive master form stabila tors done different way wings order achieve greater accuracy lead ing trailing edges spatula technique used much involved way building original return gives greatest possible accuracy current hightech F3B Gliders made way method starts very sturdy alumi num base plate exact length stab wing made end screwed air foil template exactly half airfoil show ing above base plate space between root tip airfoil templates base plate filled gray molding resin very straight rule resin dispersed within given space Starting trailing edge rule pulled forward toward leading edge drawing process repeated up 20 times amount resin scraped off decreases time root tip templates removed after resin cured aluminum frame bulit around base plate molding process pretty much same wings Since stabs symmetrical build upper lower section part Building actual stab done very much same fashion wing except balsawood used sandwich / thick mold fuselage explained before made friend Jurg mold rudder made exactly like stabs explained above cant explain exact malting fuselage mold Jurg has done job process commonly known anyway explain actual making fuselage top coat white gel coat polyes ter stinks terribly thin layer glass 40 gin per sq meter added before Kevlar cloth graphite fiber strands inserted Key lar about one-third lighter glass very difficult trim cut off carbon fibers added skinny tail sec tion fuselage absolute necessity high-speed flight model tends automati cally dive downward higher speeds reached stabilizers must exert downward force maintain level flight fuselage stiff enough will bend making control dif ficult make fuselage takes about eight hours Special parts Speedos made molded carbon fiber include stab crank lever incorporates two ball bearings wing joiner rod 8mm steel roller bearings ensure easy rotation wing panels first Speedo 87 models wings twisted small crank levers currently have gone directly driving leading edge pins Multiplex servo have used Multi plex Royal radio years am very satisfied really worried before maiden flight Speedo 87 after investing about 800 hours work worked project three months straight working regular job kind wonders what going hap pen flew beautifully major adjust ments After first few turns noticed its very stable uncritical flight behavior could barely stall did stall went smooth downward curve Its restitution ability convert speed height surprised because much better Speedo 86 very good itself Because its low-speed flying capabilities can take advantage smallest thermals updrafts its thin 9% airfoil also very fast Glider speeds up 150 mph easily reached Due its high penetration Speedo 87 also perfect aerobatics After about first two hours intensive fly ing could see easily outperformed its smaller brother Time after time Speedo 87 has admired amazed Glider pilots can say bragging pretty much outperforms Glider have ever flown owned within 17 years flying hope can see kind handcrafting involvement needed cant massproduce put realistic price tag model reasons Jurg have agreed sell Speedo 87 Thanks very much Martin Bamert tak ing time share important interest ing technology us hope descrip tion will encourage some Americans try du September 1988 139 plicate super-high-tech Sailpianes being made Europe F3B Britain recent issue Sean Walbanks White Sheet Club newsletter con tained very interesting article Bill Stephen Haley latest F3B design KB Merlin Stephen flew Merlin very creditable fourth place last years World Cham pionships Bill British ream manager came within few points repeating World Championsjust getting nipped wire Austrians Sean also edits Soaring column R/C Model World magazine well-known pursuing inside scoop model design ers Im sure Bill put arm him think youll enjoy story asked give story de velopment latest F3B model KB Merlin flown son Stephen fourth place 1987 World Champs West Germany first reaction far go back history Most competition model designers would proba bly agree good models normally devel oped over long period through series mod els model usually being modified version before no exception KB Merlin made some rather dras tic changes previous F3B models start Well feel obvious start ing point demise beloved Eppler 193 airfoil changing Quabeck section World Champs team trials expected take place late 1986 believe 193 finest all-around sections available Soaring fact placed fourth two pre vious team trials using section Having said time marches re alized although Thermal Distance tasks relatively easy 193 just fast enough modem international com petition mind built pair F3B mod els using Quabeck 210 section 2% camber 10% thick design span 116 straight-tapered nine-inch root seveninch tip chord models plug-on wings incorporating system using ballast tubes wing-joiner tubes %2-in ti tanium bar joiner effort try save weight decided eliminate spar using HT alloy tube spar reinforced carbon top bot tom wings covered epoxy/glass skins made sheet glass attached using ep oxy vacuum-bag system models corporated full-span flaperons operated two servos wing fact spar turned out far better theory practice crash 86 nation als split carbon-fibre away alloy tubes Stephens model later crash did same ie bond between tube carbon fiber wasnt good Per haps bad preparation tubes event never happy models al though definitely fast found banker event Duration task very much harder fact great difficulty thermaling properlythermal turns posing particular problems Having both European World Championships British team am con vinced British fliers best Thermal pi lots world dont have beat about bush Bill Tell us what thinkSW bad air lads will go looking lift hav ing found will work proven occasion Germany foreign fliers simply launched mod els sat wind hoped six min utes Enough prattle decided hold team trials May 87 rather Septem ber 1986 great lack success using Quabeck section felt another com plete rethink required com petitive time completed new fuse lage designed one-piece wing What wing section use started looking elusive worldbeater using very simple per formance criteria ie capable eight minutes flight average 24 laps Dis tance easy 16 seconds Speed timeall downdraughts Eventually came across Girsberger sections limited technical knowl edge decided RG 15 looked exactly what looking little naive thought discovered new wing section no else usinglittle did know outcome felt **it bust tlme either continue Quabeck section hope practice would make us competitive design build completely new models short time available hope flew off building board chose latter route Because felt either us successful getting British team would have time build spare models before World Championships July decided build two models trials large gamble failed perform no chance schedule programmed ensure least two models ready Christmas 86 would enable us get some practice incorporate modifications required other two models Once again theory proved better practiceand fact first ones completed month before team trialsnot enough time Wing construction again blue foam cores composite carbon-fibre spars time covered epoxy/glass skins applied wet plastic sheet still us ing vacuum-bag technique Ballast tubes incorporated wings access through small hatches wing top wing now one-piece except plug-on tips allow wings carried 10-ft model box plug-on tlps proved poor idea Controls ailerons rudder elevator trailing edge air brakes also incorporated arrester hook designed elec tronics expert Barry Mason springloaded rod projected straight down below cockpit actuated full rudder Barry fit ted pushbuttons onto transmitter gave us momentary full rudder release rod aimed wing loading 125 oz/sq ft planes fact turned out 135 oz/sq ft risk work worth Well af ter friend helped us CG use computer four models superb fly fact ways similar E193 ones have found Duration task rel atively easy achieve especially winch launches now getting about Distance task again very good feel need practice order improve As task has now altered man-on-man unlimited laps four minutes awful lot points can gained lost Much skill required now get best out model Distance Ballasting example now critical ever air speed has spot-on positioning course vital Lastly probably impor tant good teammates needed keep informed what other fliers ing task usually flown four group last task Speed KB Merlin fast Well Steve proved fastest fliers week Germany actually fast est days atrocious weather condi tions During practice before competition did run 165 seconds Simprops private fly ing field pretty obvious above delighted results efforts time published should well way 88 models leamed great deal 87 World Championships etc 140 Model Aviation MODELERS FIGHT-BACK TRUE-FACTS N EWSLETTER 444 Tired b ing ignorci editors Fed up wills never having questions answered FIGHT BAcIt Join us letter year s reader written publication spen letter communication between fellow modelers R$ fre flight 5 good thLsg iV TSonly wst Mississippi 2 Atvse limits models orflpiig sites 2 YhatLvfvrinsisrsisseiehst eye rktc IASstility toiecerd UIA Hhy AU LETTERS PUBUSI/AD $300 recieve sne copy $550 pub letter & copy $1950 4 issues & letters 1 yr Quarterly July OctJanApril THE PTERANODON PRESS 42 55 551 55 CA MASK CA glue works wonders building ntodels right Unfortunately gives enough fumes knock vulture off carcass modelers have suffered medical problems after inhaling CA fumes take chances special vapor respirator filters CA fumes soft face mask adjustable straps comfortably fits face sizes easy breathing valve allows prolonged use providing dependable filtering concentrations up 1000 PPM though rugged industrial mask light weight elimi nate fatigue Dont get gassed CA Get protected Order CA Mask today Just $1247 shipping cheaper hospital visit Money order Master Charge Visa include expiration date check allow 20 days clear Sorry no CODs Pelican Enterprises 2540 RIDGE ROAD LANSING ILLINOIS 60438 P S Send catalog modelers safety supplies RADIO CONTROL SHORT KITS FOR 25 TO 45 ENGINES VISIT OUR OUTLET STORE AT 15 MORGAN STREET IN CRYSTAL LAKE IL QUALITY PRODUCTS SINCE 1g64 THESE TWINS HAVE BEEN DESIGNED BY NATIONALS CHAMPION HAL PARENTI AND REFLECT HIGH CALIBER OF MODEL ENGINEERING THAT IS HARD TO BEAT AS WITH ALL OF OUR SHORT KITS THEY ARE BUILT AROUND FOAM CORE WING AND BOX FRAME FUSELAGE FOR SIMPLE BUT STURDY CONSTRUCTION THE SPECIALLY DESIGNED AIRFOILS AND GENEROUS TAIL AREAS GIVE THEM OUTSTANDING FLIGHTPERFORMANCE THROUGH OUT THE ENTIRE SPEED RANGE NEW P-38 LIGHTNING TWIN 706495 0 A-26 INVADER TWIN 685495 SHORT KITS INCWDE WING CORES CANOPIES COWLS PLANS ENGINE MOUNTS FIRE WALLS MOLDED MISC PARTS SHORT HARDWARE PACKAGE AND MATERIALS LIST FOR ADDITIONAL BALSA AND HARDWARE NEEDED ORDERING SEND CHECK OR MONEY ORDER FOR REOUIRED AMOUNT PLUS 450 PER KIT CANADIANS ADD $650 TO WING MFG PO BOX 33 CRYSTAL LAKE 1L60014 ILLINOIS RESI DENTS ADD 64% SALES TAX ALL ORDERS MUST REIN US FUNDS SEND 355 FDR PRODUCT CATALOG DESCRIRING OUR COMPLETE LINE OF FOAM WING CORES ACCESSORIES KITS TOOLS AND MUCH MORE sjh/A4 MEG WORLD WAR II FIGHTER SERIES AGM2 ZERO 54 SPAN 2995 P-40 TOMAHAWK 55 SPAN. 2995 P-39 A IRA COBRA 55 SPAN . 2995 P-Sb MUSTANG 54 SPAN . 2995 C202 FOLGORE 56 SPAN 5 FOCKE WULF 19054 SPAN. 2995 PHONE 815-459-0417 feel models can improved fair bit regret people dont have go F3B experience thrill pilot ing beautifully handling plane various tasks really belief F3B Formula Soaring hope few people will have go Sportsman TaskIF3B League introduced 1988 amazing few dedicated F3B fliers coun try Great BritainEd well international competitions Im sure would better still support come budding World Champs Have go dont know what youre missing Im thankful Bill Stephen Haley Great Britain took time share thoughts fellow sportsmen Thanks too Sean Walbank having news letter readand pass US Sailplaners ULF-1 plans article Wasserkuppe appeared May issue photos unusual glider known Ultra Light Footlaunch-One Quite few readers sent let ters requesting get plans infor mation interesting plane Unfortu nately didnt know time write plans MAs publisher Carl Wheeley did lot spadework located magic address Dieter Reich Heiner Neumann Anecho strasse No 16 D-8000 Munchen 82 West Ger ULF-1 plan pack consists 30 blueprints cutaway drawings illustrations English price 1986 360 Deutsch Marks about $215 current exchange rates source Carls information wants remind potential builders man-carrying craft footlaunch gliders just unforgiving life limb other aircraft advice anyone attempting fly should have prior struction training conventionally launched sailplanes Amen 1988 MARCS Sailplane Symposium Chairman Bill Vogelsang wants everyone know Symposium will held November 12-13 1988 Madison WI format will similar previous years talks table clinics etc may wish arrive early trip FAA Museum Oshkosh will arranged fall get-together becoming must Sailplaners Midwest others can fly weekend Anyone would like further information welcome write Bill 5933 Mayhill Dr Madison WI 53711 Slope Soaring news Im sure Sailplaners avidly reading Model Aviations new Slope Soaring column edited mark Triebes specialized Slope column first American magazines another sign progress making spreading gospel Person ally Im very encouraged positive things happening SoaringMarks new column being just example part future Ill concentrate flatland Soaring defer mark Slope matters may occasional exception special event feel close such Scale Slope Fun-Fly held Richland WA over Labor Day weekend Contest Direc tor Wil Byers phoned just before deadline time column let everyone know TRICS-sponsored Fun-Fly tremendous suc cess 58 fliers over 100 Scale planesboth regular Sailplanes Power Scale ships people came just spectate talk Scale Sailplanes 124 Saturday evening banquet turnout much much bigger us dared hope last year Bill Liscomb San Diego suggested such event Wil stepped forward offer TRICS magnificent slopes Give Sailplaners what want theyll come out also super support model man ufacturers dealers contributed over $4000 worth merchandise top ra dios Scale kits Wil said flier received some prize icing cake because everyone great time anyway Wil promised send complete report pictures next months column RC Giant Scale/de Vries Continued page 53 nique using plastic foam board Ken Otto elucidated techniques heat seating com ponents coatings white glue Vail Kinsey updated crowd silver-soldering techniques application silver soldering engine mufflers Leo Ford expert field demon strated fiberglass molding techniques including male female molds use release agents seminar topped off District IX Ra dio Frequency Coordinator Steve Mangles presented some enlightening facts about narrowband broadband transmitters receivers Theres lot recommend foilowing Chapter 90s lead scheduling such super show-andtell supreme example modelers helping modelers having ball doing recommending things club has taken plunge voted certify its RC transmitters May meeting certification orgy over 200 transmitters checked stickered Although isnt AMA requirement flying club field should now much safer electronically process combined use six carefully spaced concrete-block pilot positions should result mimmum radio interactive interference Now can convince people tum-on un less have pin latest Wendell Hostetlers Plans Works 1041 Heatherwood Lane Orrville OH 44667 big Fairchild PT-19 Its beautiful usual Wendell said moved bunch USAAF trainer drawings Toledo shin dig attesting excellence Bob Holman PO Box 741 San Bernardino CA 92402 producing some beauties World War subjects first SESA Dennis Bryant quarter-scale will knock sox off Dead-on scale shows mark master Scale builder drawings $2495 plus $3 P&H second new set plans Bob aimed true scratch-builder What hes done enlarge own Nieuport 17 drawings quarterscale show scale internal structure would adequate construct model truly dedicated builder plans $15 However Bob says hell send both SESA Nieuport 17 drawings customer $35posiaid Nicuport plans successful Bob mdiContinued page 144 September 1988 141