Free Flight: Duration

Free Flight Duration Bill Hartill THE FREE FLIGHT GYPSY back again short visit word downwind FAI-CIAM Plenary meetIng held Paris April 23-25 procedure Free Flight technical subcommittee discuss agen da items pass Plenary meet ing recommendations modifications FAI Sporting Code Plans World Continental Championships also discussed Indoor World Championships will held August 22-26 Cardington England Team housing will high-quality hotel standard separate bedrooms bath Rooms within walking distance contest site Total package costs $208 contestants $165 supporters hoped welcome trend away pricey World Champs Yugoslavia European Championships FlA FiB FIC will held Pitestii Romania Sep tember 9-15 Fees $180 cover accomoda tion meals transport banquet additional $50 contestant NonEuropeans have flown European Cham pionships previously unofficial guests fact Chinese FlC flier topped field two years ago Whether bending entry rules encouraged remains seen Normally national teams invited EuroFVSELAAC/d 55/ 4V/MC 57 7 STAB/El//S 2 2 P055830CC / WONT P//SB/P 003 S P/TOP P50 20 TO/AL 05 CAP/CO BALSA PROP3 57 40 SAP//CE TOP BOAT 5SS 332 PITC//Z//PVST V/C 348 35584/5* /& 0025 ___ l 00 fl/PBA//T5 /155//C CEA55P8PSP4PCOTISS//E-TOP /s 5/zo P/BS30 i/CM 8/-- WA/ON APPO7L 25 42 A//A/C 2382Pt STAB /0744 2BO IN P303 -CS A/RB 7o eBS 2072 -/30 CAPBOPF/SCP *0705 TA/BC P4/A/TED 50 A/A/TE A/SANE I 134/ - b/ n-P EAT/P A/ASH/P S S 4/3/P8/5 /48 SOT/A//AS /OAOA/ 350 I34/5 S//lU 5548 /2 /ssasoOTee0/ -F//SCOT PA//OTEOSEO ~i;t L38 //0 ///5 3 //4 SPA/LEE BALSA T/P38 54 5/05 ~~~1 N/PC Al/C P0/C C C//S/CC PEP BC NO 22 FiB ST 303 WHITE SCAT Californian Bob White Wakefield No 22 Seguin TX team-selection finals Helper/wife Toni air-picker Tom Medley fill out Bobs team System approach stresses reliability air-picking dependable models Drawing shows wing mounts negative incidence Drawing Craig Cusick pean community Frances offer host 1987 Free Flight World Championships accepted FAT Site will near Poitiers about 100 miles southwest Paris region Poitou well-known annual competition held local organizers have done very well past promises affair remember Accommodations will include hotels university dormitory camping facilities Argentina has submitted offer host 1989 Free Flight World Champs no details yet available FAI acceptance has yet granted Dropping builder-of-the-model rule defeated Plenary meeting though passed five-to-four technical meeting Reasons put forth drop ping BOM included difficulty enforc ing desirability encouraging production lower-performance ready-to-fly models beginners event tradi tionai linking construction competitive flying proved stronger sentiment though enforcement nebulous thing discussion held concerning specific violations FAI Sporting Code some competitions held 1985 agreed ail FAI contests should run fairly ac cordance Sporting Code provide emphasis thoughts FAI recognition withdrawn 1986 Italcantieri Ita ly competition because organizers again proposed using attempts limit waiting time proposed accepted Cham pionships national team will have right provide qualified timekeeper brings up question should AMA pro vide travel entry fee support nominated timekeeper should he/she 58 Model Aviation /88 NO -/ A/CBS Per Grunnet Denmark FAI plane Andante after placing third st B5 World Champs Livno Yugoslavia five competitors make eightminute flyoff round selected Netherlands proposed substantial mod ification Championships flying schedule included combination FlA FlB FiC flown day longer maximums morning very interesting proposal generated lot discussion however deci sion could reached matter referred ClAM Free Flight subcommit tee redraft proposal France proposed two timekeepers should time independently reduce chances both timing wrong model passed will effective next Sporting Code January 1988 later second French proposal passed effec tive immediately changing way two timekeepers times will averaged Automatic averaging will canceled event er ror malfunction Such circumstances will referred organizer jury Proposals establish new FiC specifica tion rejected technical committee matter referred subcommit tee review Thanks Ian Kaynes George Xenakis providing information FAI Paris meeting Bob White Wakefield No 22 deveioped fly 1984 Team Selection Finals Seguin TX wind expected Previous design parameters modified better cope windy weather As turned out plane proved quite simple adjust has always consistent flier very thin wing section quite challenge construct Hard C-graln balsa used wing ribs medium hard balsa throughout rest plane Two planes same configuration have built fly equally well No 22 flown World Champs Livno Yugoslavia placed seventh doing 552 six-minute fly-off round week before Iset-Kurtalic Memorial Contest Livno No 24 flown fourth place neutral alr planes will easily make three- four-minute max However Bob thinks higher aspect ratio necessary stillair flights five minutes plus drawing shown gives necessary details shown dihedral 162 inches inboard panel 425 inches tip measured plane inner panel CG 75% root chord USA FAI status vs World Class June 1986 FF Duration column contalned com ments Jerry Murphy current trends US Wakefield design capable pro ducing World Class model also stated Bob Whites models limit what can expected ald additional gadgetry variable-incidence tail auto rudder auto-pitch prop delayed prop start etc Jerry threw opinion US team organization . appeared dissolve quickly team participants became separated scattered along flight line during flyoff rounds Well now what should make appears observer perhaps wrong conclusions may drawn Jerrys comments may based limited views complex situation First top Wakefields USA World Class Europeans know per sonal experience flying us Bob White has probably exposure flying World Class Wakefield representing USA competition record has well about spectacular No hasnt won big have Has Ver bitsky ever FiC World Champ Bobs approach Wakefield consider entire system concentrate competition effectiveness just technical superiority model reason Bob puts emphasis model reliability freedom worry about devices have no safety margin deliberate calculat ed approachnot failure ability insight may cup tea fact Wakefielders USA included enjoy developing complex mechanisms props stabs etc lacking inno vative spirit implied Jerry individ ual fliers vary balance give programmed devices vs basic design handling characteristics thermal-detection strategy following some comments Bob White has passed along us regarding subject Jerry mention collective effort Wakefield capable producing World Class model definitely agree statement As far innovations gadgets such variable-pitch prop delayed release mechanisms VIT tails have around long time have used Wakefield fliers Walt Ghio has using VIT tails since early Seventies consis tently evening air time 5/ minutes plus have seen him over six minutes Champagne Flyoffs considerable regularity delayed prop release has serious flaws its reliability still biu factor will notice Russians World Champs launched planeand prop did release variable-pitch prop flaring prop has some debatable characteristics sense have using flaring prop years mention Russian Wakefields two dropped out before did superior USA record past World Champs does confirm statement about performance constant-geometry model error mention flew four-minute flyoff round went considerably beyond flew six-minute flyoff round almost achieved max time 552 termination flight due dissipation thermal perfor mance airplane addition Id like say chose fly Wakefield gadgetry would probably drop event fly Radio Control think record FiB speaks itself criticism team conduct team management confused unjust six World Championships have tended five member team competition best-managed best-organized must remem ber group individuals placed team individual efforts regimented subservient group pro fessionals pay own expenses spend good bit lives making living some thing other model airplane flying pit tance get being team members finitesimal compared training prac tice expenses expend year year out world-competitive feel area could improve upon thermal-picking capabilities Eastern Block countries plus North Korea China air-picking spe cialists West Germans course have done well three consecutive programs addition recording device thermal-picking done other team mem bers also flying efforts divided did faultless job certainly acknowledge efforts closing would like ask Jerry Continued page 156 September 1986 59 Russian Wakefield flier Andrukov demon strateavertical launch technique Note prop locked feathered pitch rotating Andrukov has thrown plane highand prop still locked Timer starts prop 08 sec after launch also programmed change stab incidence rudder setting wing differential incidence After power run prop folds normal fashion Al Bissonnette R brotherwith Als Fl C plane Taft CA getting ready celebrate Als second place Max Men Annual 1429 Fox Dale P1 Sidney OH 45365 clever ruse hinging rudder letting find ____________________________________ felt happiest solve problem FF Duration/Hartill straightened out flights right winners Continued page 59 circle _________________________________________________ Top dog Peanut Clarence Mather Parnall Pixie top Junior Jeff Witt man definitely has knack Tailwind Contester Lacey Ralph Cooke put up fine flights trio Gas jobs Ian Payne slipped fine float-equipped Vultee L-1 third Gas Second Ferrell Papic tried-and-true Astro 02-powered Bleriot 7 taking top honors Bill Stromans Taube CO-2 power Its great flier new one-inch-to-the-foot Bellanca CF four cells takes Astro 02 worked marvelously extra weight really nice thing about electric can always move batteries rearward balance motor prop xeight prop Bristol slotted hub Dick Howards famous cottage-cheese-container plastic blades glued Theyre almost indestruc tible contest scene April May months hard keep up going San Diego Scale Staffel Annual interesting set Otay Mesa about mile Mexican border place alive La Migra US Immigration Naturalization officers well illegals heading north work fields California Just meet got going well moved Navy Seals parachute team could make several drops onto field Still lots great thermals lots neat Scale activity week later off Taft Taft Free Fligliter means space thermals hobnobbing lots people know what doing exactly Memorial Day weekend meet US Free Flight Championships year being number 16 great fun events almost type imaginable both Indoors Out couple non-Free Flight types put evening demonstration precision Quarter-Scale aero batics two Quadra-powered Lasers Both crashed Free Flight planes did year quality flying excellent Scale Taft always fun because have ROG rise off ground great booming thermals can place mediocre models have look fantastic Still models notably mediocre Mike Mulligans Jumbo Rubber Cranwell Parasol Loren Williams Rumpler Bipe Dick Siefrieds 54-inch Me-109 PT-19 making easy flights 1-1/2 two minutes Mulligans ship directionalstability problems last year employed Happy hint Ferrell Papic tells us rubber lube great taking Hot Stuff off fingers took top off bottle Hot Stuff internal pressure built up days heat squirted over placebut luckily eyes rubber-lubing about half hour afterwards Don Srull out spying West Coast secrets DC Maxecuters sald uses baby oil same purpose Ill have try ideas since usually wind up using sanding block 60-grit gamet paper get dang stuff off own bod Just received new Repla-Tech International aircraft catalogs two booklets can get sending $360 company 48500 McKenzie Highway Vida OR 974881 heartily recommend stuff modelers can use way Aeromodeller plans Hirsch raceplane drawings forty-cent black-andwhite snaps Golden Age racers packs color shots covering tons good subjects Tiger Moth pack features ancient brass com passes mahogany instrument panels both cockpits photo packs seem hover around average price 80 cents per snap color some have upwards 40 pictures same plane Some others have five serious about particular plane bargaln catalog descriptions worth trip Send along experiences have tiny Electric Scale jobbies well try keep gang posted Ciao Bill Warner 423 San Vicente Blvd Santa Monica CA 90402 build modern Wakefield go flying us perhaps would alter thinking whether World Competitive Russian Wakefield desIgn features Now lets take look what advanced technology has done FiB design Just remember part competition formula Ron Pol lard Great Britain has written interesting paper describing development Russian Wakefields paper presented SMAE Technical Symposium 1985 Design analysis excerpted follows Note following abbreviations DPR Delayed Prop Release VIT Variable-Incidence Tall AR Auto Rudder VIW Variable-Incidence Wing wish increase climb rate model two options open crease power use power available efficiently power available Wakefield virtually fixed energy-stor age-capacity rubber quality sec ond option open Improved efficiency means reduced drag significance means wing drag Lift drag interrelated given wing section incidence fore lift could reduced zero drag would reduce dramatically trouble theory lift model will climb unless. unless model pointed way wish go upwards steepest angle possibleverti cal practical best climb configuration need look no further designs used Power fliers So get following features WIng airfoil section should have low camber thinfive six percent aspect ratio should range moderate high 121 151 dihedral should rela tively low flat center resist turn Fuselage Short nose long tall moment arm low pylon keep model going straight resist turn Center gravIty Forward location 550/s Continued page 158 156 Model Aviation FF Scale/Warner Continued page 57 60% chord stability Combined long tail moment arm allows small tailplane area about 18% wing area tail volume coefficient will about 155 160 Propeller design unusual mechanism operating very complex diameter 600mm pitch 750mm re duction root tip variable pitch situation confused 1982 version pitch appeared continuously-variable respect torque high medium However 1984 mechanism appeared high/medium/high DPR first seen Russian model 1981 Wake field fliers assumed its purpose get extra height power launch have suspected some time main reasonbut bonus prime rea son DPR give model consistent high-angle launch restriction having use other hand release prop Clearly conditions no lift powerful high-angled launch just useful essential interesting note model no-lift state very vulnerable structural flexing twisting particularly wing caused shock power-on loads DPR has led devel opment very rigid wings based D box formed Kevlar carbon fiber cap strips stiffen ribs As stated earlier reduce drag lift neutralized massive amount VIT order 5mm tailplane movement also augmented left wing-half being washed Out approximately 2mm means three variables ie VIT AR VIW proper timing sequence follows 03-08 secsdelayed prop release 5 secVIT AR 32 secVIW 38-40 secprop folds Alex Andrukov uses above sequence variation favored Viktor Roshnov pro duces similar results 03-08 secDPR 5 sec VIT 15 secVIW 32 secAR 36 secprop folds means power pattern can operated controlled sequence allows tactical flying take place other words allows Russian fliers decide whether other models lift downwind before launching key flight pattern VIW wing-half allows long straight downwind climb hoped other models thus equipped considerable advantage Because flying style two other techniques used very fast wind-up helped props being de tached take advantage marked lift other flier decides launch after wind-up constantly puts extra handturns motor approximately turn eve ry 10 seconds keep torque high level As stated introduction theme fast climb let glide take care itself true design features give models best chance achieving objective however features could listed requirements obtaining good glidefeatures such thin wing sec tion aspect ratio 12-151 total area 16dm2 wing low dihedral short nose long tail moment arm stability Russian models glide well fast flat together high climb give performance some 300 seconds confirmed Alex Andrukov European Championships Livno 1984 Well now hope will encour age take approach can com fortable no single best solution competition just get high stay high Wing spoilers revisited Back once again June 1986 column Harry Murphy included piece spoiler DT used Don Assels FUBAR Bill Bogart adds following bit technical data should take care sub ject awhile FUBAR wing spoiler DT brought mind Jetex-powered rocket ship designed built Dallas Nats 1960 model looked like large HLG all-balsa wing tail figured way DT model spoiler centermounted spoiler piece / ply wood X five inches its very first DT dived straight ground just did Dons FUBAR Natu rally damage served its intended purpose other type DT will work cause greater dam agea cherry bomb order get thing work before Nats kept reducing spoiler span until down little over inch Nats maxed first flight dethermalized didnt come down Too strong thermal Thus lesson wing spoiler will DT ship must made small enough keep DT damaging plane doing its DT effectiveness reduced considerably better nothing much reason straight-down dive center-mounted spoiler reduces spoils lift wing within its span reduces downwash stab causing increase stab angle attack lift Hence ship noses down vertical no lift wing spoiler has no lift spoil theres no change downwash ship trimmed againall way ground Recently Bill Winter piece about center-mounted wing spoilers benefits spot landing experienced same type trim change causing considerable amount Up elevator trim Pictures also showed ship flying greater angle attack spoilers out used two spoilers located outboard stab span would have noticed anywhere near trim change pitch Saslplanes locate spoilers well outboard tail span very same reason cannot afford dive ground height 10 feet order put ship down Nordic Glider notes November issue Vol Libre carried interesting article Allard van Wallene Netherlands construction ribless wings FlA builds separate upper lower shells pre formed molds shells primarily Rohacell-5 1 hard polyurethane foam rein forced carbon fiber Details given articleand English yet can con tact him directly address Allard VAN WALLENE Dreef 9 3628 B J Kockengen NL USA several top fliers have working foam Jim Wilson has promised story soon experiences Mean kind like thinking Per Grun nett Denmark written Modeiflyve Nyt time have written about mod els have finished something like important thing model hanging end towlinethe main factor 158 Model Aviation VINTAUK It-C PLAN aPBY-5A CATALINA~ 9E-r WING SPAN L RIBS 8 FULL FORMERN SHOWN ON PLANS rIC ENG COWLS $1090 PR CLEAR GUN BLISTERS $ 760 PR 4 LARGE PLAN SHEETS s $ 1895 6FT WING SPAN MODEL PBY-5A ENGINE COWLS $750 PR Plans $1495 GUN BLISTERS $ 550 PR ADO $300 POSTAGE CATALOGOVER 50 PLANS $100 DEALERS WRITE WORLDWIDE SID MORGAN 13157 ORMOND BELLE VILLE MICH 48111 USA PUZZLED CALL MATT No time build Mutt itl II have time. know 1 Complete Call 9am -8 pm lEST 2 Semi-Assembled609-395-1672 ready cover sanded MATTS MODEL BUILDING P0 Box 49 Cranhury NJ 08512 Rate cards available free SASE 4-1/8x9-1/2 also build Cars Boots CAP 21 SERIES bine line scale detail superb aerobatic ability Choose 40-size 60-size giant Quadra size comes epoxy-liberglass fuselage Cap 21s feature built-in quality youd expect Great Planes kit premium-quality balsa extensive hardware ABS wheel pants cheek cowls com plete plans instructions youve seen Cap 21s build great look great. boy fly See exciting Cap 21s dealer near today Availahie Leading Retailers -IDI&I VIAIILt Natiunwide Montx - FREE FLIGHT SUPPLIES FAI Rubber Japanese Tissue Rubber Lube Nitrate Dope Front End Bearings Assemblies Crocket Hooks DT Fuse KSB Timers Cox Engines & Parts Kits Blue Ridge Peck Midway Micro-x others PO Box 5996 Lake Worth FL 33461 CATALOG SIOO person holding other end line.. example Livno made 10 maxes flights model around towline height higher dethermalized means FlA glider could have flown 10 maxes flown same air model did Under marginal conditionssuch calm air rain otherwise difficult conditionsa good model very valuable because will get extra seconds friends high-performance models will Under such conditions model high per formance may make winner under ideal conditions like Livno 85 extra per formance will pay off miss ther malor last flyoff round Therefore important spend time trimming yourself competition rather using time squeeze out little models Electronic locating devices Matt Gewain sent interesting summary devices locat ing lost models using beepers and/or transmit ter beacons story old everyone has ex perienced too times still repeat ed out flying favorite model have spent hundreds hours care fully building trimming suddenly model lost Maybe DT did work flew off wind direction changed landed area high vegetation trees Finding returning model fly again big part what flying Free Flight about also critical phase modeling has changed much since DT vented Well technology exists some thing about drastically increasing odds finding model again reducing amount time takes locate lost model Systems such radio beacons buzzers incorporated models have proven very much worth extra effort com plexity weight system matter choice radio beacon powered small watch battery can weigh little seven grams require very little space fly ing FlA model carrying around 100 grams lead ballast might well replace some retrieval system buzzer particularly useful finding model high vegetation times have found model after hours searching discover passed within few feet lying tall grass behind tree buzzer would have saved much time radio beacons expensive have some capabilities make worth expense different types beacons have built over last few years Some operate FM broadcast band others CB band some operate higher fre quencies band select determines great extent cost system amount radio interference will have FM-band systems least expensive receivers being readily available must pick frequency between commercial broadcasters area travel contest another area may faced returning radio beacons GB-band radios little expensive areas should some channel rela tively free interference high-frequency radios specifically designed purpose tracking animals consequently systems have few interference problems very high sen sitivity available antennas highly directional However prices also considerably higher On/Off Switch Radio Suacon sunny Trasomittar 0 OT Switch Matt Gewain uses circuit activate two finderaids planes abuzzerand radio beacon Theres discussion coiumn Radio beacons basically line-of-sight devices model ground range typically couple hundred yards model air range can beyond point model goes out sight can search large areas rather quickly model equipped radio beacon system have incorporated FlA models consists nine-volt battery drive Radio Shack buzzer radio beacon sim ple schematic shown elsewhere column system uses Radio Shack 273-054 sixvolt buzzer mounted top fuselage between wings inexpensive can heard reasonable distance DT switch microswitch piece A6-in aluminum tubing glued switch arm DT line runs through tube holds arm down DT down DT popped tube acts DT limit same time allows normally-closed contact switch close buzzer sounds on/off switch two-pin female connector mounted easily accessible insert U-shaped piece wire sockets NEWSPACESA FUEL CONTAINER rita Bun s7-318 high s91/I Tough Rigid PuIpellaylsos Includes Tuhiog plus $020 pustag Fasteners Loch Tuhing Through Cap North Products PO Box 18419 cleveland Heights OH 44118 September 1986 1 G Mfg 857 HIgh Mountain Rd North PsIdon NJ Q7*e LAIOO IIIS MACHINB I5 011ff SOPPLIES t the Avrotun Module BLUEALGEI [Jo/ MACHINERYANJLS INC 35-Wv Vacation at-AC WOSLV Handy Disney World Kennedy Space Center rest Florida 3 Bedrooms steeps 8 Kitchen A/C Pool Tennis lots It/C flying Nov-May $500 wk / Jane-Oct 8450 wk / nightly & monthly rates also availahle 657 528-4048 * SCALE DOCUMENTATION * SCALE DRAWINGSAAMODEL PLANS PHOTOS BOOKS EPLA-TECH 1986 RNATIONAL AIRPLANE CATALOG noes moo roses48500 MC KENzIE HWY $300VIDA OREGON 97488 QUALITY FREE FLIGHT KITS AND SUPPLIES FOR COMPETITION AND SPORT SINCE 1975 Dealer inquiriesCatalog 508 invited BLUE RIDGE MODELS. BOX 429SKYLAND NCZ8175 CARBON MAT SAMPLE 2 OR 5 OZ/SQ YD SEND $1 00 EACH TO AEROSPACE COMPOSITE PRODUCTS 28 Crosswood Rd Farmlngton Ct 06032 PaAaWu DIESELS Englands Finest 049 35 RIC STD Send $100 Ust Eric Clutton 913 Cedar Lane Tuliahoma Tsnn 37388 , Gal 159 V Box 1063 Lorain Ohio 44055 282-8354 PEANUT SCALE Piper Vagabond Outdoor kits each. 3650 LightIndoorkitseach.3695 OUTDOOR PEANUT SuperScale. 3695 SPORT SCALE PC-6 Porter q Taylor Crall Stinson Voyager Rubber CO2 Power PC-S PorterKits each. 3750 fIPORT MODELS n Embryo Model lb l8 Span gned win beginners experts. 3750 HARD-TO-FIND ITEMS Early Bird Tissue Antique Aircraft 3595 True Olde Japanese Tissue 10 3 colors 95 Japanese Tissue 12 6 colors 3395 Microlite ham3325 Silver$395 Microfilm 3375 Glue Solvent Condenser Paper 3 sheets 3315 Plan Service over 17 Scale Sport Scale & Peanut Scale Rubber Strip 020 thirs 085each 3175 3132 thirs 5/32each 3105 Winder 61 395 Mark 1161 105 Complete Line Brown CO2 Motors Balsa Wood Outdoor & Indoor Sheets & Strips Add 10% Postage mum Postage 3150 COMPLETE CATALOG 3150 close switch also use two-pin connector interface radio beacon can easily change radios have problem part battery nine-volt alkaline transistor radio battery can fly weekend months single battery radio bea cons avallable have advertised NFFS Digest Model Builder over last year Some addresses write further infor mation Bradley Model Products 1337 Pine Sap Ct Orlando FL 32817 Gil Morris 2810 Brackley Rd Columbus OH 43220 Jim Wal ston Retrieval Systems 725 Cooper Lake Rd SE Smyrna GA 30080 Lost models have accepted us being price must pay enjoying Free Flight modeling Well about change think retrieval systems will common Free Flights future DTs today Bill Hartill 7513 Sausalito Ave Canoga Park CA 91307 FF Old-Timers/Haught Continued page 60 may beneficial sand inside mating portions left right tail post pieces good contact joined Glue together well making sure two sides evenly bent whole structure symmetrical viewed above Add remaining cross pieces between jig-area tail post glue dry remove cardboardjigby cutting parts needed get out Pull nose fuselage together required install remaining cross pieces Any tension needed keep nose pieces pulled together can supplied rublerbands clamps Finish up structure adding formers stringers other parts required Some Old-Timer fuselages built using crutch method essentially consists building sturdy frame top view fuselagethe so-called crutch crutch instill pinned building board top bottom case may members added usually consist formers stringers although may simply built-up truss stick structure Alignment important agaln use cardboard jigs fixtures can valuable aid struc ture completely dry removed plan completed midalr Alterations modifications original design features Old-Timers intended used SAM O-T competition discouraged simply allowed example sheet balsa cannot substituted built-up structures although struc tural changes can added improve strength Beef up built-ups approved prac tice An example necessary strengthening use larger wing spars absorb landing shockloads incurred dethermalizing process Another example adding extra fill-sheeting between structural members nose area aid handling model particularly engine running use laminated tips wings tall sections popular old method joining sections cut sheet balsa led weak struc tures warpage covering Laminated tips can quickly built up form cut corrugated cardboard Wax edges form crayon prevent glue adhering form Cut laminations sheet stock place water approxi mately 15 minutes Pull bend first strip around form Secure rubberbands Add glue pull second strip around form adjusting rubberbands keep strips place Continue process until laminations installed Allow assembly dry thoroughly may speed up &ying time baking whole works oven low heat Some modelers prefer use CyA glues laminating wood must dry set sharp bends required prefer wet method Built-up models work pride accomplishment greater nothing quite like sight sunlight shining through open structure model soars quietly overhead Clarence Haught 3226 Honeysuckle Dr Coeur dAlene ID 83814 Rx Rash/Kruse Continued page 61 around trying find everything needed course weekend stum bles fell stack beaded Styrofoam panels intended insulation purposes available 4 x 8-ft sheets various thicknesses ally neat thing about Styrofoam sheet under $5 answer problemif could fmd some way stick stuff together Because wanted put boxes together minimum mess labor opti use Elmers Contact Cement can brushed allowed dry stuck together Its compatible withpractically surfaces including foam can counted form permanent bond immediately upon contact make short story shorter after measuring planes determine suitable dimensions cut needed side panels tops bottoms table saw stuff cuts like butter leaves no ragged edges brushed glue let dry pressed panels together form box Total elapsed time start finish two hours total three boxes added friction-fit lids cutting top panel inside dimension box oneto outside dimension laminating two contact cement form tidy little unit total cost les $12 three boxes still have enough foam board contact cement another box needed negative note whole project upon arriving Nats unpacking planes several people rushed overto look boxes ask made Nobody asked about planes Maybe Im wrong end hobby best way go project cut ends two bottom pieces width length second bottom piece will become bottom lid will fit down inside box table saw works best operation crosscut hand saw would probably work well may leave ragged edge Next cut sides size Remember 160 Model Aviation

Free Flight Duration Bill Hartill THE FREE FLIGHT GYPSY back again short visit word downwind FAI-CIAM Plenary meetIng held Paris April 23-25 procedure Free Flight technical subcommittee discuss agen da items pass Plenary meet ing recommendations modifications FAI Sporting Code Plans World Continental Championships also discussed Indoor World Championships will held August 22-26 Cardington England Team housing will high-quality hotel standard separate bedrooms bath Rooms within walking distance contest site Total package costs $208 contestants $165 supporters hoped welcome trend away pricey World Champs Yugoslavia European Championships FlA FiB FIC will held Pitestii Romania Sep tember 9-15 Fees $180 cover accomoda tion meals transport banquet additional $50 contestant NonEuropeans have flown European Cham pionships previously unofficial guests fact Chinese FlC flier topped field two years ago Whether bending entry rules encouraged remains seen Normally national teams invited EuroFVSELAAC/d 55/ 4V/MC 57 7 STAB/El//S 2 2 P055830CC / WONT P//SB/P 003 S P/TOP P50 20 TO/AL 05 CAP/CO BALSA PROP3 57 40 SAP//CE TOP BOAT 5SS 332 PITC//Z//PVST V/C 348 35584/5* /& 0025 ___ l 00 fl/PBA//T5 /155//C CEA55P8PSP4PCOTISS//E-TOP /s 5/zo P/BS30 i/CM 8/-- WA/ON APPO7L 25 42 A//A/C 2382Pt STAB /0744 2BO IN P303 -CS A/RB 7o eBS 2072 -/30 CAPBOPF/SCP *0705 TA/BC P4/A/TED 50 A/A/TE A/SANE I 134/ - b/ n-P EAT/P A/ASH/P S S 4/3/P8/5 /48 SOT/A//AS /OAOA/ 350 I34/5 S//lU 5548 /2 /ssasoOTee0/ -F//SCOT PA//OTEOSEO ~i;t L38 //0 ///5 3 //4 SPA/LEE BALSA T/P38 54 5/05 ~~~1 N/PC Al/C P0/C C C//S/CC PEP BC NO 22 FiB ST 303 WHITE SCAT Californian Bob White Wakefield No 22 Seguin TX team-selection finals Helper/wife Toni air-picker Tom Medley fill out Bobs team System approach stresses reliability air-picking dependable models Drawing shows wing mounts negative incidence Drawing Craig Cusick pean community Frances offer host 1987 Free Flight World Championships accepted FAT Site will near Poitiers about 100 miles southwest Paris region Poitou well-known annual competition held local organizers have done very well past promises affair remember Accommodations will include hotels university dormitory camping facilities Argentina has submitted offer host 1989 Free Flight World Champs no details yet available FAI acceptance has yet granted Dropping builder-of-the-model rule defeated Plenary meeting though passed five-to-four technical meeting Reasons put forth drop ping BOM included difficulty enforc ing desirability encouraging production lower-performance ready-to-fly models beginners event tradi tionai linking construction competitive flying proved stronger sentiment though enforcement nebulous thing discussion held concerning specific violations FAI Sporting Code some competitions held 1985 agreed ail FAI contests should run fairly ac cordance Sporting Code provide emphasis thoughts FAI recognition withdrawn 1986 Italcantieri Ita ly competition because organizers again proposed using attempts limit waiting time proposed accepted Cham pionships national team will have right provide qualified timekeeper brings up question should AMA pro vide travel entry fee support nominated timekeeper should he/she 58 Model Aviation /88 NO -/ A/CBS Per Grunnet Denmark FAI plane Andante after placing third st B5 World Champs Livno Yugoslavia five competitors make eightminute flyoff round selected Netherlands proposed substantial mod ification Championships flying schedule included combination FlA FlB FiC flown day longer maximums morning very interesting proposal generated lot discussion however deci sion could reached matter referred ClAM Free Flight subcommit tee redraft proposal France proposed two timekeepers should time independently reduce chances both timing wrong model passed will effective next Sporting Code January 1988 later second French proposal passed effec tive immediately changing way two timekeepers times will averaged Automatic averaging will canceled event er ror malfunction Such circumstances will referred organizer jury Proposals establish new FiC specifica tion rejected technical committee matter referred subcommit tee review Thanks Ian Kaynes George Xenakis providing information FAI Paris meeting Bob White Wakefield No 22 deveioped fly 1984 Team Selection Finals Seguin TX wind expected Previous design parameters modified better cope windy weather As turned out plane proved quite simple adjust has always consistent flier very thin wing section quite challenge construct Hard C-graln balsa used wing ribs medium hard balsa throughout rest plane Two planes same configuration have built fly equally well No 22 flown World Champs Livno Yugoslavia placed seventh doing 552 six-minute fly-off round week before Iset-Kurtalic Memorial Contest Livno No 24 flown fourth place neutral alr planes will easily make three- four-minute max However Bob thinks higher aspect ratio necessary stillair flights five minutes plus drawing shown gives necessary details shown dihedral 162 inches inboard panel 425 inches tip measured plane inner panel CG 75% root chord USA FAI status vs World Class June 1986 FF Duration column contalned com ments Jerry Murphy current trends US Wakefield design capable pro ducing World Class model also stated Bob Whites models limit what can expected ald additional gadgetry variable-incidence tail auto rudder auto-pitch prop delayed prop start etc Jerry threw opinion US team organization . appeared dissolve quickly team participants became separated scattered along flight line during flyoff rounds Well now what should make appears observer perhaps wrong conclusions may drawn Jerrys comments may based limited views complex situation First top Wakefields USA World Class Europeans know per sonal experience flying us Bob White has probably exposure flying World Class Wakefield representing USA competition record has well about spectacular No hasnt won big have Has Ver bitsky ever FiC World Champ Bobs approach Wakefield consider entire system concentrate competition effectiveness just technical superiority model reason Bob puts emphasis model reliability freedom worry about devices have no safety margin deliberate calculat ed approachnot failure ability insight may cup tea fact Wakefielders USA included enjoy developing complex mechanisms props stabs etc lacking inno vative spirit implied Jerry individ ual fliers vary balance give programmed devices vs basic design handling characteristics thermal-detection strategy following some comments Bob White has passed along us regarding subject Jerry mention collective effort Wakefield capable producing World Class model definitely agree statement As far innovations gadgets such variable-pitch prop delayed release mechanisms VIT tails have around long time have used Wakefield fliers Walt Ghio has using VIT tails since early Seventies consis tently evening air time 5/ minutes plus have seen him over six minutes Champagne Flyoffs considerable regularity delayed prop release has serious flaws its reliability still biu factor will notice Russians World Champs launched planeand prop did release variable-pitch prop flaring prop has some debatable characteristics sense have using flaring prop years mention Russian Wakefields two dropped out before did superior USA record past World Champs does confirm statement about performance constant-geometry model error mention flew four-minute flyoff round went considerably beyond flew six-minute flyoff round almost achieved max time 552 termination flight due dissipation thermal perfor mance airplane addition Id like say chose fly Wakefield gadgetry would probably drop event fly Radio Control think record FiB speaks itself criticism team conduct team management confused unjust six World Championships have tended five member team competition best-managed best-organized must remem ber group individuals placed team individual efforts regimented subservient group pro fessionals pay own expenses spend good bit lives making living some thing other model airplane flying pit tance get being team members finitesimal compared training prac tice expenses expend year year out world-competitive feel area could improve upon thermal-picking capabilities Eastern Block countries plus North Korea China air-picking spe cialists West Germans course have done well three consecutive programs addition recording device thermal-picking done other team mem bers also flying efforts divided did faultless job certainly acknowledge efforts closing would like ask Jerry Continued page 156 September 1986 59 Russian Wakefield flier Andrukov demon strateavertical launch technique Note prop locked feathered pitch rotating Andrukov has thrown plane highand prop still locked Timer starts prop 08 sec after launch also programmed change stab incidence rudder setting wing differential incidence After power run prop folds normal fashion Al Bissonnette R brotherwith Als Fl C plane Taft CA getting ready celebrate Als second place Max Men Annual 1429 Fox Dale P1 Sidney OH 45365 clever ruse hinging rudder letting find ____________________________________ felt happiest solve problem FF Duration/Hartill straightened out flights right winners Continued page 59 circle _________________________________________________ Top dog Peanut Clarence Mather Parnall Pixie top Junior Jeff Witt man definitely has knack Tailwind Contester Lacey Ralph Cooke put up fine flights trio Gas jobs Ian Payne slipped fine float-equipped Vultee L-1 third Gas Second Ferrell Papic tried-and-true Astro 02-powered Bleriot 7 taking top honors Bill Stromans Taube CO-2 power Its great flier new one-inch-to-the-foot Bellanca CF four cells takes Astro 02 worked marvelously extra weight really nice thing about electric can always move batteries rearward balance motor prop xeight prop Bristol slotted hub Dick Howards famous cottage-cheese-container plastic blades glued Theyre almost indestruc tible contest scene April May months hard keep up going San Diego Scale Staffel Annual interesting set Otay Mesa about mile Mexican border place alive La Migra US Immigration Naturalization officers well illegals heading north work fields California Just meet got going well moved Navy Seals parachute team could make several drops onto field Still lots great thermals lots neat Scale activity week later off Taft Taft Free Fligliter means space thermals hobnobbing lots people know what doing exactly Memorial Day weekend meet US Free Flight Championships year being number 16 great fun events almost type imaginable both Indoors Out couple non-Free Flight types put evening demonstration precision Quarter-Scale aero batics two Quadra-powered Lasers Both crashed Free Flight planes did year quality flying excellent Scale Taft always fun because have ROG rise off ground great booming thermals can place mediocre models have look fantastic Still models notably mediocre Mike Mulligans Jumbo Rubber Cranwell Parasol Loren Williams Rumpler Bipe Dick Siefrieds 54-inch Me-109 PT-19 making easy flights 1-1/2 two minutes Mulligans ship directionalstability problems last year employed Happy hint Ferrell Papic tells us rubber lube great taking Hot Stuff off fingers took top off bottle Hot Stuff internal pressure built up days heat squirted over placebut luckily eyes rubber-lubing about half hour afterwards Don Srull out spying West Coast secrets DC Maxecuters sald uses baby oil same purpose Ill have try ideas since usually wind up using sanding block 60-grit gamet paper get dang stuff off own bod Just received new Repla-Tech International aircraft catalogs two booklets can get sending $360 company 48500 McKenzie Highway Vida OR 974881 heartily recommend stuff modelers can use way Aeromodeller plans Hirsch raceplane drawings forty-cent black-andwhite snaps Golden Age racers packs color shots covering tons good subjects Tiger Moth pack features ancient brass com passes mahogany instrument panels both cockpits photo packs seem hover around average price 80 cents per snap color some have upwards 40 pictures same plane Some others have five serious about particular plane bargaln catalog descriptions worth trip Send along experiences have tiny Electric Scale jobbies well try keep gang posted Ciao Bill Warner 423 San Vicente Blvd Santa Monica CA 90402 build modern Wakefield go flying us perhaps would alter thinking whether World Competitive Russian Wakefield desIgn features Now lets take look what advanced technology has done FiB design Just remember part competition formula Ron Pol lard Great Britain has written interesting paper describing development Russian Wakefields paper presented SMAE Technical Symposium 1985 Design analysis excerpted follows Note following abbreviations DPR Delayed Prop Release VIT Variable-Incidence Tall AR Auto Rudder VIW Variable-Incidence Wing wish increase climb rate model two options open crease power use power available efficiently power available Wakefield virtually fixed energy-stor age-capacity rubber quality sec ond option open Improved efficiency means reduced drag significance means wing drag Lift drag interrelated given wing section incidence fore lift could reduced zero drag would reduce dramatically trouble theory lift model will climb unless. unless model pointed way wish go upwards steepest angle possibleverti cal practical best climb configuration need look no further designs used Power fliers So get following features WIng airfoil section should have low camber thinfive six percent aspect ratio should range moderate high 121 151 dihedral should rela tively low flat center resist turn Fuselage Short nose long tall moment arm low pylon keep model going straight resist turn Center gravIty Forward location 550/s Continued page 158 156 Model Aviation FF Scale/Warner Continued page 57 60% chord stability Combined long tail moment arm allows small tailplane area about 18% wing area tail volume coefficient will about 155 160 Propeller design unusual mechanism operating very complex diameter 600mm pitch 750mm re duction root tip variable pitch situation confused 1982 version pitch appeared continuously-variable respect torque high medium However 1984 mechanism appeared high/medium/high DPR first seen Russian model 1981 Wake field fliers assumed its purpose get extra height power launch have suspected some time main reasonbut bonus prime rea son DPR give model consistent high-angle launch restriction having use other hand release prop Clearly conditions no lift powerful high-angled launch just useful essential interesting note model no-lift state very vulnerable structural flexing twisting particularly wing caused shock power-on loads DPR has led devel opment very rigid wings based D box formed Kevlar carbon fiber cap strips stiffen ribs As stated earlier reduce drag lift neutralized massive amount VIT order 5mm tailplane movement also augmented left wing-half being washed Out approximately 2mm means three variables ie VIT AR VIW proper timing sequence follows 03-08 secsdelayed prop release 5 secVIT AR 32 secVIW 38-40 secprop folds Alex Andrukov uses above sequence variation favored Viktor Roshnov pro duces similar results 03-08 secDPR 5 sec VIT 15 secVIW 32 secAR 36 secprop folds means power pattern can operated controlled sequence allows tactical flying take place other words allows Russian fliers decide whether other models lift downwind before launching key flight pattern VIW wing-half allows long straight downwind climb hoped other models thus equipped considerable advantage Because flying style two other techniques used very fast wind-up helped props being de tached take advantage marked lift other flier decides launch after wind-up constantly puts extra handturns motor approximately turn eve ry 10 seconds keep torque high level As stated introduction theme fast climb let glide take care itself true design features give models best chance achieving objective however features could listed requirements obtaining good glidefeatures such thin wing sec tion aspect ratio 12-151 total area 16dm2 wing low dihedral short nose long tail moment arm stability Russian models glide well fast flat together high climb give performance some 300 seconds confirmed Alex Andrukov European Championships Livno 1984 Well now hope will encour age take approach can com fortable no single best solution competition just get high stay high Wing spoilers revisited Back once again June 1986 column Harry Murphy included piece spoiler DT used Don Assels FUBAR Bill Bogart adds following bit technical data should take care sub ject awhile FUBAR wing spoiler DT brought mind Jetex-powered rocket ship designed built Dallas Nats 1960 model looked like large HLG all-balsa wing tail figured way DT model spoiler centermounted spoiler piece / ply wood X five inches its very first DT dived straight ground just did Dons FUBAR Natu rally damage served its intended purpose other type DT will work cause greater dam agea cherry bomb order get thing work before Nats kept reducing spoiler span until down little over inch Nats maxed first flight dethermalized didnt come down Too strong thermal Thus lesson wing spoiler will DT ship must made small enough keep DT damaging plane doing its DT effectiveness reduced considerably better nothing much reason straight-down dive center-mounted spoiler reduces spoils lift wing within its span reduces downwash stab causing increase stab angle attack lift Hence ship noses down vertical no lift wing spoiler has no lift spoil theres no change downwash ship trimmed againall way ground Recently Bill Winter piece about center-mounted wing spoilers benefits spot landing experienced same type trim change causing considerable amount Up elevator trim Pictures also showed ship flying greater angle attack spoilers out used two spoilers located outboard stab span would have noticed anywhere near trim change pitch Saslplanes locate spoilers well outboard tail span very same reason cannot afford dive ground height 10 feet order put ship down Nordic Glider notes November issue Vol Libre carried interesting article Allard van Wallene Netherlands construction ribless wings FlA builds separate upper lower shells pre formed molds shells primarily Rohacell-5 1 hard polyurethane foam rein forced carbon fiber Details given articleand English yet can con tact him directly address Allard VAN WALLENE Dreef 9 3628 B J Kockengen NL USA several top fliers have working foam Jim Wilson has promised story soon experiences Mean kind like thinking Per Grun nett Denmark written Modeiflyve Nyt time have written about mod els have finished something like important thing model hanging end towlinethe main factor 158 Model Aviation VINTAUK It-C PLAN aPBY-5A CATALINA~ 9E-r WING SPAN L RIBS 8 FULL FORMERN SHOWN ON PLANS rIC ENG COWLS $1090 PR CLEAR GUN BLISTERS $ 760 PR 4 LARGE PLAN SHEETS s $ 1895 6FT WING SPAN MODEL PBY-5A ENGINE COWLS $750 PR Plans $1495 GUN BLISTERS $ 550 PR ADO $300 POSTAGE CATALOGOVER 50 PLANS $100 DEALERS WRITE WORLDWIDE SID MORGAN 13157 ORMOND BELLE VILLE MICH 48111 USA PUZZLED CALL MATT No time build Mutt itl II have time. know 1 Complete Call 9am -8 pm lEST 2 Semi-Assembled609-395-1672 ready cover sanded MATTS MODEL BUILDING P0 Box 49 Cranhury NJ 08512 Rate cards available free SASE 4-1/8x9-1/2 also build Cars Boots CAP 21 SERIES bine line scale detail superb aerobatic ability Choose 40-size 60-size giant Quadra size comes epoxy-liberglass fuselage Cap 21s feature built-in quality youd expect Great Planes kit premium-quality balsa extensive hardware ABS wheel pants cheek cowls com plete plans instructions youve seen Cap 21s build great look great. boy fly See exciting Cap 21s dealer near today Availahie Leading Retailers -IDI&I VIAIILt Natiunwide Montx - FREE FLIGHT SUPPLIES FAI Rubber Japanese Tissue Rubber Lube Nitrate Dope Front End Bearings Assemblies Crocket Hooks DT Fuse KSB Timers Cox Engines & Parts Kits Blue Ridge Peck Midway Micro-x others PO Box 5996 Lake Worth FL 33461 CATALOG SIOO person holding other end line.. example Livno made 10 maxes flights model around towline height higher dethermalized means FlA glider could have flown 10 maxes flown same air model did Under marginal conditionssuch calm air rain otherwise difficult conditionsa good model very valuable because will get extra seconds friends high-performance models will Under such conditions model high per formance may make winner under ideal conditions like Livno 85 extra per formance will pay off miss ther malor last flyoff round Therefore important spend time trimming yourself competition rather using time squeeze out little models Electronic locating devices Matt Gewain sent interesting summary devices locat ing lost models using beepers and/or transmit ter beacons story old everyone has ex perienced too times still repeat ed out flying favorite model have spent hundreds hours care fully building trimming suddenly model lost Maybe DT did work flew off wind direction changed landed area high vegetation trees Finding returning model fly again big part what flying Free Flight about also critical phase modeling has changed much since DT vented Well technology exists some thing about drastically increasing odds finding model again reducing amount time takes locate lost model Systems such radio beacons buzzers incorporated models have proven very much worth extra effort com plexity weight system matter choice radio beacon powered small watch battery can weigh little seven grams require very little space fly ing FlA model carrying around 100 grams lead ballast might well replace some retrieval system buzzer particularly useful finding model high vegetation times have found model after hours searching discover passed within few feet lying tall grass behind tree buzzer would have saved much time radio beacons expensive have some capabilities make worth expense different types beacons have built over last few years Some operate FM broadcast band others CB band some operate higher fre quencies band select determines great extent cost system amount radio interference will have FM-band systems least expensive receivers being readily available must pick frequency between commercial broadcasters area travel contest another area may faced returning radio beacons GB-band radios little expensive areas should some channel rela tively free interference high-frequency radios specifically designed purpose tracking animals consequently systems have few interference problems very high sen sitivity available antennas highly directional However prices also considerably higher On/Off Switch Radio Suacon sunny Trasomittar 0 OT Switch Matt Gewain uses circuit activate two finderaids planes abuzzerand radio beacon Theres discussion coiumn Radio beacons basically line-of-sight devices model ground range typically couple hundred yards model air range can beyond point model goes out sight can search large areas rather quickly model equipped radio beacon system have incorporated FlA models consists nine-volt battery drive Radio Shack buzzer radio beacon sim ple schematic shown elsewhere column system uses Radio Shack 273-054 sixvolt buzzer mounted top fuselage between wings inexpensive can heard reasonable distance DT switch microswitch piece A6-in aluminum tubing glued switch arm DT line runs through tube holds arm down DT down DT popped tube acts DT limit same time allows normally-closed contact switch close buzzer sounds on/off switch two-pin female connector mounted easily accessible insert U-shaped piece wire sockets NEWSPACESA FUEL CONTAINER rita Bun s7-318 high s91/I Tough Rigid PuIpellaylsos Includes Tuhiog plus $020 pustag Fasteners Loch Tuhing Through Cap North Products PO Box 18419 cleveland Heights OH 44118 September 1986 1 G Mfg 857 HIgh Mountain Rd North PsIdon NJ Q7*e LAIOO IIIS MACHINB I5 011ff SOPPLIES t the Avrotun Module BLUEALGEI [Jo/ MACHINERYANJLS INC 35-Wv Vacation at-AC WOSLV Handy Disney World Kennedy Space Center rest Florida 3 Bedrooms steeps 8 Kitchen A/C Pool Tennis lots It/C flying Nov-May $500 wk / Jane-Oct 8450 wk / nightly & monthly rates also availahle 657 528-4048 * SCALE DOCUMENTATION * SCALE DRAWINGSAAMODEL PLANS PHOTOS BOOKS EPLA-TECH 1986 RNATIONAL AIRPLANE CATALOG noes moo roses48500 MC KENzIE HWY $300VIDA OREGON 97488 QUALITY FREE FLIGHT KITS AND SUPPLIES FOR COMPETITION AND SPORT SINCE 1975 Dealer inquiriesCatalog 508 invited BLUE RIDGE MODELS. BOX 429SKYLAND NCZ8175 CARBON MAT SAMPLE 2 OR 5 OZ/SQ YD SEND $1 00 EACH TO AEROSPACE COMPOSITE PRODUCTS 28 Crosswood Rd Farmlngton Ct 06032 PaAaWu DIESELS Englands Finest 049 35 RIC STD Send $100 Ust Eric Clutton 913 Cedar Lane Tuliahoma Tsnn 37388 , Gal 159 V Box 1063 Lorain Ohio 44055 282-8354 PEANUT SCALE Piper Vagabond Outdoor kits each. 3650 LightIndoorkitseach.3695 OUTDOOR PEANUT SuperScale. 3695 SPORT SCALE PC-6 Porter q Taylor Crall Stinson Voyager Rubber CO2 Power PC-S PorterKits each. 3750 fIPORT MODELS n Embryo Model lb l8 Span gned win beginners experts. 3750 HARD-TO-FIND ITEMS Early Bird Tissue Antique Aircraft 3595 True Olde Japanese Tissue 10 3 colors 95 Japanese Tissue 12 6 colors 3395 Microlite ham3325 Silver$395 Microfilm 3375 Glue Solvent Condenser Paper 3 sheets 3315 Plan Service over 17 Scale Sport Scale & Peanut Scale Rubber Strip 020 thirs 085each 3175 3132 thirs 5/32each 3105 Winder 61 395 Mark 1161 105 Complete Line Brown CO2 Motors Balsa Wood Outdoor & Indoor Sheets & Strips Add 10% Postage mum Postage 3150 COMPLETE CATALOG 3150 close switch also use two-pin connector interface radio beacon can easily change radios have problem part battery nine-volt alkaline transistor radio battery can fly weekend months single battery radio bea cons avallable have advertised NFFS Digest Model Builder over last year Some addresses write further infor mation Bradley Model Products 1337 Pine Sap Ct Orlando FL 32817 Gil Morris 2810 Brackley Rd Columbus OH 43220 Jim Wal ston Retrieval Systems 725 Cooper Lake Rd SE Smyrna GA 30080 Lost models have accepted us being price must pay enjoying Free Flight modeling Well about change think retrieval systems will common Free Flights future DTs today Bill Hartill 7513 Sausalito Ave Canoga Park CA 91307 FF Old-Timers/Haught Continued page 60 may beneficial sand inside mating portions left right tail post pieces good contact joined Glue together well making sure two sides evenly bent whole structure symmetrical viewed above Add remaining cross pieces between jig-area tail post glue dry remove cardboardjigby cutting parts needed get out Pull nose fuselage together required install remaining cross pieces Any tension needed keep nose pieces pulled together can supplied rublerbands clamps Finish up structure adding formers stringers other parts required Some Old-Timer fuselages built using crutch method essentially consists building sturdy frame top view fuselagethe so-called crutch crutch instill pinned building board top bottom case may members added usually consist formers stringers although may simply built-up truss stick structure Alignment important agaln use cardboard jigs fixtures can valuable aid struc ture completely dry removed plan completed midalr Alterations modifications original design features Old-Timers intended used SAM O-T competition discouraged simply allowed example sheet balsa cannot substituted built-up structures although struc tural changes can added improve strength Beef up built-ups approved prac tice An example necessary strengthening use larger wing spars absorb landing shockloads incurred dethermalizing process Another example adding extra fill-sheeting between structural members nose area aid handling model particularly engine running use laminated tips wings tall sections popular old method joining sections cut sheet balsa led weak struc tures warpage covering Laminated tips can quickly built up form cut corrugated cardboard Wax edges form crayon prevent glue adhering form Cut laminations sheet stock place water approxi mately 15 minutes Pull bend first strip around form Secure rubberbands Add glue pull second strip around form adjusting rubberbands keep strips place Continue process until laminations installed Allow assembly dry thoroughly may speed up &ying time baking whole works oven low heat Some modelers prefer use CyA glues laminating wood must dry set sharp bends required prefer wet method Built-up models work pride accomplishment greater nothing quite like sight sunlight shining through open structure model soars quietly overhead Clarence Haught 3226 Honeysuckle Dr Coeur dAlene ID 83814 Rx Rash/Kruse Continued page 61 around trying find everything needed course weekend stum bles fell stack beaded Styrofoam panels intended insulation purposes available 4 x 8-ft sheets various thicknesses ally neat thing about Styrofoam sheet under $5 answer problemif could fmd some way stick stuff together Because wanted put boxes together minimum mess labor opti use Elmers Contact Cement can brushed allowed dry stuck together Its compatible withpractically surfaces including foam can counted form permanent bond immediately upon contact make short story shorter after measuring planes determine suitable dimensions cut needed side panels tops bottoms table saw stuff cuts like butter leaves no ragged edges brushed glue let dry pressed panels together form box Total elapsed time start finish two hours total three boxes added friction-fit lids cutting top panel inside dimension box oneto outside dimension laminating two contact cement form tidy little unit total cost les $12 three boxes still have enough foam board contact cement another box needed negative note whole project upon arriving Nats unpacking planes several people rushed overto look boxes ask made Nobody asked about planes Maybe Im wrong end hobby best way go project cut ends two bottom pieces width length second bottom piece will become bottom lid will fit down inside box table saw works best operation crosscut hand saw would probably work well may leave ragged edge Next cut sides size Remember 160 Model Aviation