Winner World Championships Utrecht Netherlands Les discusses approach design flying host other important factors first Stiletto ones fol lowed through 1974 35 size powered popular 0S Max Quite often stunt fliers will save new plane major meet get competi tive edge big Southeasterns Win ston-Salem NC. saw both Les New Yorker Gene Schaffer bring out new planes Les new Stiletto 700 pow ered ST 46 foam wing molded balsa stab contest weather bit unsettled Les fly round gusty condition second round steady wind Both flights filmed almost impossible tell what wind conditions big Stiletto upset Schafler win As matter fact four Stilettos flown Southeasterns three won trophies second appearance new Sti UC ONALDS Introduction Kent Rogers Interview Wynn Paul Vince Schnetzer SINCE LES McDONALD designed first Stiletto 1970 has become popular competition stunters recent years once heard question contest Hey buddy Nobler now hear Stiletto about often Stiletto came time stunt being flown slightly-bulky jet types tricycle gear semi-scale World War II fighters course Noblers Ares flying also al 70s airplanes still around except Stiletto Its sleek sani tary appearance set apart may reason planes popularity has campaigned others such Remel Cooper Dennis Duval Kenny Stevens Randy Smith 28 Model Aviation Vince Schnetzer launches Stilleto Les Tropic Aeros Annual Airshow Muscular Dystrophy Note slim fuselage appears thanks treatment color scheme letto 700 1975 Lake Charles Nats Les placed second old master Bob Gieseke point bad con sidering Gieseke reigning world champ time Nineteen seventy-five also year selection FAI team site Dayton Ohio weather horri ble big powerful Stiletto flew four smooth accurate patterns just missed third place did have consist ently high scores four rounds following weeks Les returned home started building two new models lighter sleeker version 700 somewhat smaller 660 sq airplane remainder history de cision Bob Gieseke compete de fending champ Les would allotted number three team spot July 11 1976 after three days hard-fought competi tion Les McDonald flying Stiletto 660 crowned Control Line Aerobatics World Champion Two stunt fliers have spent consid erable time talking Les Wynn Paul Vince Schnetzer Wynn certainly needs no introduction anyone re motely interested precision aerobatics knows hes top flier moving force ETJ square eight Working logic started thinking about enlarging cur rent design about 15% installing 46 didnt take long realize wasnt such hot idea new model would have start scratch paper really lose head some times next several weeks spent drawing neatest looking thing ever sawtwo Veco 19s ship ETTO thing longer 11-in prop strug gled spring finally reached com promise lt confident big Stiletto knew could build something better Wynn What reason going asmallerplanestil 46 size Les I wanted smaller plane looked big using high aspect ratio wing stab long fuselage trim 660 behind PAMPA Vince other hand just getting started competition aero batics has just completed first Sti letto 660 Model viation plans Recently both Wynn Vince dis cussed items interest Les following interview evolved answers some questions never before published contains some good information fledgling contest flier Wynn Up until 1975 season Stilettos 35 engines What prompted switch larger airplane what big factors design Les I think made decision give 46 model try during second finals round 74 Nats can still remember watching little 10-in prop spinning its brain out trying crawl across top portion square eight dead calm Driving back Miami reasoned larger motor will turn larger prop bigger prop pushes air pushing air makes airplane go forward better con stantly going forward kinda neat competition evenly matched appear ance becomes vital Les thinks must create own advantages important elements configuration markings text made F-16 look like boxcar Anyway chickened out began sketching some thing little conventional actually designing what eventually became Stiletto 700 main concern contered around mandatory use 018 lines roll yaw larger diameter prop might create Most people flying 46 models season before using over 750 sq wings certain could get away less could keep weight down As turned out ended up using Control Specialties foam job wide chord pitch stability 700 sq carry heavy lines dampen possible yaw prob lems built fuselage relatively deep moderate size fin never did have problems yaw airplane roll total grief thing super critical tip weight wouldnt consider flying anypaint full length think achieved what looking Actually 660 isnt smallfrom tip tail its almost 47 inches long still feel larger air planes look impressive air talk going around about small airplanes flying accurately pooh poohed fact fly shorter lines lot guys 35 models hoped slightly smaller wing would cut through bad air European flying sites notorious Werwage talked times about recent cham pionships Belgium flying ampi theater hilltop Finland flying downtown Helsinki though seen photos Utrecht circles certain would some trees flags something disturb air As turned out air did get bumpy times never unmanageable Wynn What airfoil use Les Ive always used constant 18% airfoil 2 inches leading-edge sweep Stilettos regardless aspect ratio area work hobby shop July1977 29 NASA just fiddle around sketching until looks like will work does Ill stick 660 changed 18% root 20% tip two reasons First wanted carry tip weight less wing added line tension second hoped gain some small boost lift en larging flaps tip Wynn Why favor type con trol hookup use Les Get ready surprise look plans took 20 gallons fuel figure out -to-l setup isnt trick way go high aspect ratio wing can really get control thing let explain Seven 10 Stilettos Ive built past six years have used 2/3-to-l control hookupthe first 1973 version published June 74 sue Model Airplane News Until 73 model flying 0S 35 pow ered jobs 44-48 oz 600 sq range using standard Nobler pushrod/ control-horn hookup flew reasonably well except square corner 45 degrees models seemed pivot point about halfway between hinge line could learn live funny corner bad side effect loss speed intoler able always impressed Wer wages USA ls ability fly smoothly constant speed Trinidad 1972 Bill explained theory behind 2Ato-l controls After trying 73 ship became aware what meant called power steering Bill stressed importance lightweight full benefit two advantages apparent new model would now pivot point closer CG moving flaps less lot drag eliminated finally constant speed through maneuvers years flying stunt models Ive learned thing sure must compromise 2A-to-l system no exception just doesnt work well 660 culprit long skinny wing Any minute correction controls caused ship change direction kinda like driving Chevy backwards 60 mph Ive tried everythingnose weight thin elevators closer line spacing handlebut Im going satisfied until cut aft fuselage slow down elevator movement Anyway plans show corrected system Im using 77 airplane takes harder twist wrist goes point drag added flap deflection easily overcome good 46 Wynn Is airplanes appearance real ly important Les No other toy airplane event lets builder/flier express himself precision aerobatics contest tended fliers equal ability must create own advantages good looking ship certainly helps Quite pos sibly Werwage flown big USA 1 30 Model Aviation Les McDonald Stilleto 660 world champion awards left right Steve Wooley Cup FAI Gold Medal U H U World Cup 46-powered ship weighs 54 ounces Close-up nose shows distinctive treatment Supertigre nsIamwiuon ne seDaration lines enaine compartment hatch no conspicuous decorative lines Adamisin muffler modified cooler operationhence tapered hole front Held place single 4-40 screw Also shown mapifold pressure hook-up fuel tank Nidnntnl Flap Horn-Control Sponloll. 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Internats several days lot conversation incoherent cause after months hard work de cided some fun rest order Anyway remember correctly both agreed 660 fit bill let point out some features fuselage long appears very slender although really isnt because dark blue top section gives lateral area looking bulky red gold trim follows thrust line enhance square stuff notice end stab doing models pivot point just about centered trim will give illusion tighter corner dont believe hold straight object between fingers center rotate 90 degrees move fingers forward small amount repeat 90 degree move See what mean forward placed canopy Jaws cowl give profile directional jet-age look Looking top view wing stab trim follow same angles plus wing stab tips match give overall view symmetry Line length engine sound personal appearance also con tribute overall effect Vince Are special items about construction Stiletto 660 Les Anyone has built full-bodied flapped stunt ship kit plans should able handle job fact its few stunters published re cently doesnt require specialized techniques equipment Everything used can obtained smallest hobby shops possible exception fuel tank An easy solution cant obtain big tank splice together two Distinctive landing gear strut covers made styrene held place 2-66 screws smaller ones course weight must kept min imum dont lose head because strength has place somewhere pri ority list also 660 weighs 54 ounces seems happy Im sure could built under 50 ounces going easy paint fillet Sig Epoxylite around wing leading edge inside fuselage will prevent agonizing little stress cracks sure tank compartment sealed epoxy some added strength cover nose cowl lightweight silk dont forget area over horn wires flaps ele vators can use little silk also fly stooge build good attach point use tailwheel strut anchor ply tailwheel mounts fuse sides gauze saturated Titebond place wood grain selection ultra important stab Make sure its good straight grain very firm Neat lettering always impressive take cheer can well dry transfer lettering Flying 77 model Les already concentrating FAI team selection completed stab/elevator assembly covering should weigh about 2 ounces Vince Why use aflat airfoil theflaps Les Two reasons first its very easy sand twist shaping flaps second flat airfoil section sen sitive around neutral helps model groove little better Think about Vince What methods use installing controls Les After 75 Nats accident caused broken leadout started putting lit tle thought loads generated larger airplane first figured steel chain would job leadouts some inch water pipe could used pushrods added weight could compensated using 60 engine 15-in prop rebuilt EZiust handle movable rudder two-tone green paint job seemed appropriate dis cussed wife threatened move out turned attention subtle improvements Sig nylon bellcrank looks strongest todays market held wing 10/32 rod am now ready pull-test whataya mean again scales bellcrank end leadouts use 045 piano wire loop wrapped soldered low temperature silver solder Perfect brand cable other end simply loop cable around eyelet wrap solder avoid cor rosion use rosin flux very careful overheat cable Long life system guaranteed good horn bush ings use 5/32 brass tube soldered horn slip piece /s over pushrod Make sure isnt slop flaps just little elevators sure retaining washers never come off cut small groove way Continued page 84 32 Model Aviation MORE GOsame powerYELLOW ~eePROPELLEFB de o9 Taco 5354h aP9oBlade63 6-4 er74 76 78 5O zeeach8486 88 65 \ a6364104106 86 8-611-411-611-81 86889-6 106 1 128AC124 961063 BladeTractorT25126 iso 104 1606-3 64 GRISH ushee3 Blade Pusher Metallici5o63 504 ST JOHN BROS INDIANA 46373 R C Technique/Myers continued page 16 Knowing servo should moving smoothly between limits have set internal potentiometers stick ing intermittent action unequal speeds two directions must caused defects within servo device also useful building manual posi tion switch transfers control servo knob front panel al lows examine installations interferences binding still workbench necessary tools deal problem Finally after servicing servo al ways good idea set automatic cycling few minutes let new problems appear Its surprising trash can collect inside freshly-repaired servo Chief among culprits bits steel attracted magnet servo-motor Ace Servo Cycle pro vides both positive negative control pulses instructions include ex tensive list proper pulse various manufacturers should able service practically servo market modification found useful addition 5-terminal soldering lug makes addition pigtails new servo types simple matter used scheme output side avoid short ccuit problems would generateo group parallelconnected exposed-pin plugs bat tery-pack side folks building servo-reversers use R100KCl MF RT whatever has to center servo Start 1 Meg work down George M Myers 70 Froehlich Farm Rd Hicks yule NY 11801 Stiletto/McDonald continued page 32 around pushrod washer will applied Next cut small section washer pliers gently com press washer groove solder pushrod fairleads should made plywood just loose enough pushrod can move freely Allowed too much freedom fairlead pushrod will rattle isnt good because its hard look cool airplane sounds like its falling apart Vince set up engines Les Building engine simple Get ting run exactly way want another story best running engines ever never disas sembled cleaning build motors maybe yes maybe no style After engine disassembled wet sand inside case 320 50 sleeve will slide easily position Drill ing spray bar hole tapping muf fler mount other changes outside should done point relocate needle valve just ahead stock ar rangement passes through center venturi about 5/ above center line allows motor run bit faster inverted Ill explain later venturis obtain set Bob Wilder 2010 Boston Street Irving Texas 75061 260 270 275 280 will good variety drill out mount holes file lugs can shift engine around offset need Im trimming have really space age method fitting ring Push sleeve square up piston remove piston start looking hold front bright light can see gaps tween ring sleeve rotate ring few degrees time keep checking cant detect light leaks care fully box up parts send because youve got first class fit Anyway just keep going through rings until find fits well Always bear mind sleeve might perfectly round different rings keep showing gap position sleeve try another sleeve end gap should about 006 isnt much considering sheet paper usually about 003 After deciding ring sleeve Im going use carefully deburr inside ring piston land Xacto knife new Supertigres use full circle crank aluminum stuffing band has known fly off engine grossly overheated actual case ofthisl know Sunday RC incident refuse discuss further en gine seems run same with out decide remove thing cause Murphys Law part substitute front bearing replace Consolidated EL-7-ZZ rear shield removed Last year engine just wouldnt run long enough test stand noticed what seemed quite bit fuel coming out under drive washer simply installing plastic shield bearing picked up 15 seconds running time Just make sure everything okay run engine about 15 20 minutes bench also allows tighten head backplate screws motor warm should take about 20 flights decide engine worthwhile its right youll know Wynn What procedures follow trimming new airplane Les Trying get new model trimmed hassle degree hassle depends Prop Drive Big Airplanes Specifically de signed accept 60-size engines Du-Bro prop drive will fit engine t will easily power airplanes weighing much 30 lbs Thisdevelopment definite break through RPM range 600 6000 depending engine prop used20- 22- 24-in wood props available Grish Bros Appli cations myriad example large scale models movement afoot aiming Ia-in Scale event ultra-big old-timers other models large cowlsas well overall size weightmade impossible huge 8ud Nosen scale kits similar obviously will benefit greatly Slow powerful flight will prove especially realistic gearing downa double belt drive utilizedan effective boost thrust real ized big propellers being sensi bly related size craft achieve truly effective performance levels Price $10000 less engine prop Du-Bro Pro ducts Inc Wauconda IL 60084 product review product review product review 84 Model Aviation product review product review product review
