Radio Control: Scale

WHEN proper procedures followed flying multiengined Scale RC models no diffi cult flying single-engined Scale models complex yes no difficult ever big differences ex tremely important flier new multien gine challenge know understand dif ferences Ill talking twin-engined models same principles apply models two engines First quick run-through design con struction practices Though twins considerably work build singles well worth Since engines wings twins fu selage can kept very light because its ing structurally attaching tail feathers wing speaking light weight its impera tive keep tail feathers light because twins have short nose moment arms long tail moment arms thus tend become tailheavy Dont let two engines sticking out wing fool thinking youve got lots weight up front therefore dont have worry about models becoming tail-heavy engines should set straight ahead no right left thrust 02 0 downthrust twins feel its best operate both throt tles servo have separate fuel tank engineset up just singleengined plane Also possible have hatch tank easily accessible Engine re liability absolute must twins en gine fuel system must easy get cheek things out problemand espe cially during routine maintenance simplify construction build engine na celles separate unitsjust like fuselageand glue onto completed covered wing Lets get preparations flying now have rather simple construction differ ences Out way well get actual flying far important factor flying twinengined models keep both engines running properly especially full-power setting Sounds plausible doesnt its ob servation actual practice new twinfliers concern themselves engine synchroni zation much having engine set proper running Wrong Wrong Wrong Engine synchronization problem whereas setting engine properly isand must bethe primary concern Fortunately set ting engines properly simple However simple obvious often overlooked con centration other problem ie syn Bob Fiorenze consistently has two ducted-fan engines Cook F4 Phantom 1 running perfectly takes two Zenoah 38s haul Nick Rivaldos 138-in-span 48-lb Douglas C-47 R around Scale Operation 16 paratroopers come streaming out door drop pass Ted Russell Prince Rupert British Columbia Canada built beautiful 9-ft-span Twin Otter pair OS 61 FSRs haul its 26 lb aloft Its flights five years Differential engine throttling makes taxiing easier John Tony Arands 82-in-span DH Mosquito R just after liftoff recent %th AF Scale fly-in Model uses own-design retracts twin 60s power fine flier 44 Model Aviation Radio Confrol Scale Dan Parsons 11809 Fulmer Dr Mbuquerque NM 87111 Author Dan Parsons 1961 first twin-engined effort stand-way-off Scale ME 210 Craft spanned 7 ft weighed 9 lb used two Torpedo Green Head 45s power An F&M eight-channel reed-type radio used gave great flights over two-year period Gene Bartons 100-in-span 40-lb Baker P 38 high-speed low pass Twin Super tigre 3OOOs make go Paint scheme Lefty Gardners lull-scale White Litnin Skip Mast able keep engines fabulous double-twin Lockheed C-130 Hercules turning time its seen final approach strong crosswind 1987 Scale Masters Championships chronization really isnt problem Sadly life span very short high per centage Scale twins primary reason demise unexpected loss en gine Lets increase life span trying make sure don t unexpectedly lose en gine So heres secret setting both engines engines two run reliably flight after flight Treat set engine single-engine mod ci Simple bet plane horizontal throttle wide open have engine running rich four-cycling lean needle valve until obtain solid two-cycle hold model vertical nose-up position least 10 seconds make sure engine set too lean Ideally model goes vertical posi tion engine should increase rpm slightly sags loses rpm its set too lean satisfied first engine set correctly shut down start other go through same procedure Its good idea richen engine very slightly set tings just super-safe side Check idle setting engine adjust reliable idle However give priority abso lutely reliable running full-power setting Now heres crucial part whole engine-setting procedure fire up both engines fly will full-power check plane held first horizontally ver tically trust notI repeat nottouch needle valve either engine Most Continued page 138 Over 750 Select *7 1/4 Scale18Sheets *60 SIze38Sheets *40 Size38Sheets *Propeller Decals . WT 6 Sheete-3sizes ones *Kill Markings only6Sheets *Nomenclature Markings 3 Sizes-12 Sheets Slack White copy * Letters Numbers 1/4-315-1/2-5/8-3/4-7/8-12344-13/16 10 Colors See color chart * Flags. American United Kingdom Confederate * Stainin 10 Colors 8 Sizes plus Sheet Assorted Sizes DECALS* Trm Sheets 4-3/4 26 nlaColorsseecolorchart PRESSURE SENSITIVE WATER TRANSFER_ Authentic model insignias pressure sensitive major decals mater transfer 1/4 scale 40 60 size propeller decals World War II hill mark ings stars flags letters numbers trim [v35][b-2-10-1-10]]II sheets L RTHEAST SCREEN GRAPHICS 21 FISHER AVE EAST LOHOMEADOW MA 01028 TEL 4135254118 August 1989 45 urnor Dan Parsons latest twin UM nor net first flew 1983 has made hundreds flights Weight 15 lb power pair OS 61 FSRs has repaired after pilot lapse caused recent crash INSTRUCTORS! START YOUR STUDENTS WITH FOX 25 RC ON THEIR FIRST MODEL HERE IS WHY * NO OTHER NEW 25RC HAND STARTS AS EASILY AS THE PRERUN PRE-ADJUSTED FOX * NO OTHER 25RC CAN BE REPAIRED AS QUICKLY OR AT AS LOW COST AS THE 25RC Sure mastered transmitter can roll loop fly inverted breaking cold sweat new high compression schnuerle ball bearing ABC type may right him right now needs easy cranking easy starting forgiving low cost Fox has enough power fly 40 size trainer wont need hundred dollars worth starter paraphernalia start Dont write off Fox 25RC because its low price old fashioned looks first RC model best available regard less price Glow Plug Included #22500 Fox 25 RC Bore 680 Stroke 680 Long Stroke Design Wt Muffler WER FOX MANUFACTURING CO 5305 TOWSON AVENUE FORT SMITH ARKANSAS 72901 PHONE 501 6461656 FAX 501 6461757 Forinfowriteorcall D El R AIRCRAFT MFG PO Box 299 ales TX 78629 672-7023 Malor Credit cards Acoer V EASY AS 1-2-3 Instructional Videotapes HOW TO VACUUM BAG FIBERGLASS WINGS AND WHERE TO BUY MATERIALS AND MAKING FIBERGLASS MOWS otapes give ABCs making fiberglass molds wings what equipment material will need tapes allow manufac tore fiberglass part technique CUTTING FOAM CORES AND MAKING TEM PLATES rs step-by-step technique foam wings plans Automatic Hands Off Foam cutter wifl give Sharp Trailing Edges will given videotape Bonus DRAWING PLANS & PHOTOS FOR BAT TERY POWERED BUBBLE BWWER le Blower puts out million bubbles Its ap plication study thermals great Hand Launch Thermal flying PRICING HOW TO VACUUM BAG3495 Shipping MAKING MOLDS3495 Shipping CUTTING FOAM CORES3495 Shipping BATTERY BUBBLE BLOWER PLANS699 Available VHS & BETA Texas residents add 8% sales tax Pricing Subject Change Wtrhour Notice ELECTRIC SEMI-SCALE Radio Control Sport/Trainer WIng span 67 3/4 Length 37 112 see Local Dealer PAUL K GUILLOW INC WAKEFIELD MA 01880 RC Scale/Parsons Continued page 45 time still surprises engines will pull closely sync especially model held vertically bit out sync dont worry about Go fly theyre way out sync shut both engines down go through previous engine-setting procedures engine time Youll probably get right second time around cannot overemphasize importance tweaking both needle valves both en gines running you run real risk getting least engine too lean losing shortly after takeoff worst case climbout Once engines set properly have proven themselves operating properly air usually will maintain proper set tings remainder dayor weekendof flying unless drastic change temperature humidity ever safe side always check proper engine running before flight hold ing plane vertically approximately 10 sec onds engines full power Using engine-setting procedures over 200 flights DH Hornet over period five years Ive near-perfect engine sync estimated 85% flights have engine failure due engine being too lean An important word takeoff procedures Any twin especially tail-dragger has occa sional problem swinging out control start takeoff roll because engine com ing up speed quickly other happens will immediately abort takeoff chopping power way proper abort action requires think about just before advancing throttleand practice Chances youll get lots practice first twin Generally speaking Ive found helps come up power slowly holding full Up el evator keep tail wheel ground pro vide steering during early part takeoff roll As airspeed increases rudder begins bite air can ease off elevator continuing advance throttle smoothly Its closely coordinated action works beautifully done correctly takes practice concentration thats part constant challenge flying twins keeps interesting though always set engines twin properly once great youre going lose engine due plug failure something inexcusable forgetting refill fuel tank Ive done So whats best procedure follow lose engine depends airspeed power setting First flying full power straight level lose engine probably wont know bit especially other planes fly ing cant hear engines well plane will gradually slow down perhaps sume slight yawing attitude dead en gine Youll think somebody will tell believe Ive lost engine Once sus pect prepare land ASAP have plenty altitude theres no prob lem Just throttle back couple clicks above idle come land Keep nose down slightly keep speed up make gentle rudder-coordinated turns Make fairly high approach need lengthen glide make sure ease increased power good engine small amount power good engine helps lengthen glide bunch Dont use power have dont get low approach dont get slow lose engine climbing out ing some maneuver slow speed full power plane will very likely flip up over snaplike action see immediately throttle back idle concentrate getting plane stabilized keeping nose down pick up safe flying speed gently leveling off point have plenty altitude fol low landing procedures discussed previously event engine lost plane flying low high speed youll have keep full nearly full power good engine keep up airspeed maintain what precious alti tude have Dont let planes nose come up will bleed speed Make coordi nated gentle turns youve got excellent chance make back field have misfortune losing engine flying low slow full power plane may whoop-dee-do youve probably bought farm lose engine dont worry first about gone Believe proba bly wont know engine youve lost quite dont think about kicking opposite rudder rudder trim surprise excitement fear tension following loss engineespecially plane does immediate whoop-dc-do can guarantee wont know engine went out much less rudder rudder trim put should put wrong rudder deflec tion point may well plane right full-scale pilot has shut down feathered good engine such situationand hes sitting right plane After get plane stabilized slightly nose-down flight attitude can probably figure engine went Out again its vital keep speed up turns gentle apply rudder prevent adverse yaw turns Never never make go-around engine because too-high approach unless exceptional pilota situation would say especially good rudder So its straight ahead no matter what Better sure up-and-over snap ground total destruction Ninety-nine percent twin-engine flying can completely free foregoing youll just set engine properly youll never lose Thats reason stress knowing set enginesand sticking procedure religiously subject correct engine size particu lar model very important size deter mined requirement have engine pow erful enough maintain planes altitude sufficient airspeed order provide good con trollability Err side engines too large can always throttle back So have Easy fun twin-flying simply matter reliable engines running just always old trusty single-engine weekend sport flier Just think engines twin two singles just happen connected together wing set accor dingly guarantee youll have invig orating wonderful always challenging times twin Besides else can get 138 Model Aviation Picture Worth Thousand Words magical sound RC Aerobatics/Van Putte Continued page 47 made John Burts eyes Butterfly Mike Laumans Ugly Stik met violating others airspace See landing paved runway will help Spoken writer Mike Lauman asked what would help prevent high grass popping holes MonoKote Did notice Mike Lauman made three quotes four quotes three above Mike volved three funniest think clubs newsletter has pub lished something youd like share oth ers via column please send Thanks now everybody knows OS longstroke engines tough bearings received nice letter Lewis Schwab LCS Perform ance Box 1273 Melville NY 11747 claims bearing wear due radial load rear bearing being higher bear ings can tolerate regardless type con struction claims new larger-diameter bearing way solve problem Ap parently OS agrees new engines have new crankcase/larger rear bearing can retro fit older engines getting new crankcase new rear bearing Tower Hobbies has 05MG4355 @ $6695 crankcase 05MG3108 @ $11 rear bearing Lewis also has some tips dont want whole conversion want ex tend bearing life include using bear ings installing rear bearing ex posed balls facing front engine use lower nitromethane percentages fuel will reduce/eliminate detonation hammers bearings Keeping engine speed down us ing props keep rpm below 11500 ground 11000 better also helps Idling engine half minute prior going full power will ensure full lubrication rear bearing prior putting heavy load Obviously some tips will also extend bearing life fliers make conversion too Thanks information Lewis RC Giant Scale/de Vries Continued page 51 youre interested some giant-sized speed competition Enginewise able get fin gers new Mike GR6- 120 radial en gine Radial Engine Technologies Inc 7 Greenwood Lane Valhalla NY 10595 phone1-914-686-9373 uses six 20 two-stroke cylinders weighs 525 lb twists 18 x 6 prop 8150 rpm puts out 21 hp features im pressed its needle valve may remotely located either convenience safety price reasonable compared other Giant radials may have seen em Robart PO Box 1247 St Charles IL 60174 now building scale retractable landing gears B-17 Flying Fortress models Neat Finally ol buddy Wendell Hostetler has Continued page 14i Adjustable side frames free-flow ventilation Extremely light weight added comfort Attractive case included Wraparound frame fits comfortably over prescription glasses Blocks harmful aviolet radiation- Ouartz mist coated scratch resistance Made entirely Polycarbonate impact protection ANSI Z871 specifications Available in Clear shop work S1325 Amber overcast days & late afternoons S1495 Gray S1495 & Mirror S19~ sunny days CA Mask S15~ Paint Mask S2O~ member club hit prop blade thrown 60 engine close range tip blade struck Safety Plus glasses saved him serious injury possibly tbe loss eye incident convinced everyone should wear safety glasses near model airplane engines being run upEd Saul Secretary Treasurer Pikes Peak RC Club Prices include shipping handling FLU5 See hobby dealer firsl doesnt have what need order direct SAFETY PLUS PO Box 1173 Dept iM Clinton MS 39056 ORDERS ONLY 1-800-842-7233 ICont USI Mississippi 16011 924-9640 VISAIMC August 1989 139 PILOT GLASSES. HOW VALUABLE IS YOUR EYESIGHT HANDSOFFCUTII Especially Oesigned Tapered Wings unique device cutting high quality loam wing cores HANDS OFF cutting both sides same time Available hardware package assemble own board.Specify 30 -40 50 or 80 ordering Size may changed anytime Max chord tandard Larger chords available Easy assemble Requires 24 Volt Variable Output Power Supyly DEALERS WANTED Hands ott cut II hardware packagel $8750 S & H 24 Volt Variable Output power supply$6250 -i $300 S & H VIDEO FOAM SHOP Foam Shop Part OneCutting Foam Wings hour long cuts made using HANDS OFF CuT II VH SOnly $2595 includes S & H iowei 48 Foam Shop Part TwoCutting Foam Fuselages hour long cuts made using simple bow VHSOnly $2995 includes S & H lower 48 SUPER BOND ACT ADHESIVE best contact cement have ever used Only $375 8 oz squeeze bottle tnough 4 t400 square inch wingAdd $200 S & H lower 48 1/8 inch Phenolic Board Templates Only $500 v $200 S & H NORRAY PRODUCTS 5008 Sandbeach Road Wichita Falls Texas 7631 Tel t81 76924475