Control Line: Aerobatics

Control Line Aerobatics Ted Fancher WELL suspect since reading last months windup design phase Stunt model trim have spent last 30 days designing building painting brand new Stunter very moment standing mail box new ship hand car keys other awaiting months column Preflight Trim finally Flying thing Well jump car lets go Lets begin careful examination ship insure con forms design criteria also bits pieces ready flight first step double-check screws keepers secure Frequentlyforgotten items spinner prop nuts engine mount bolts fuel line tank hold-downs leadouts line con nectors wheel keepers hinge glue-joints secure controls hinges free lubricated tail wheel secure accessible pushrod keepers secure Next lQcate MAC mean aerody namic chord both wing panels lets check see CU center gravity located per specs Item No 1 under Stability objective Trim tablesee May 1985 issue page 67 Locate design CG bottom wing panel place dex finger place cross other fingers lift extremely lucky model will balance Most likely wont weight will have add ed until design CU achieved Now pick up airplane wingtips balances fore aft might need friend span very large Locate position CG inboard wing tip measure aft design location midpoint Up Down leadouts Remember spot should line angled about three degrees aft CU referenced center aircraft roughly 1 / inches aft CU location wing tip conventional Stunters Adjust leadout spec did build movable leadout guide didnt Moving right Response Rate objective find CU once again Since weve already resolved lets go flap/Elevator Ratio Item No 4 controls accessible ad justable suggest begin one-to-one flap/elevator ratio stay until find some reason try something else one-to-one ratio closest thing universal setup can think some exceptions really enough prove rule Insure both flap elevator neutral same time check Control Deflection Item No 11 should have 400 450 travel available whether think youll need No law says have use all. hy says dont have will need first time lets mention control handle line spacing should adjusted comfortably-full wrist motion results full elevator deflection handle should vertical neu tral Oh yes long youre han dle double-check ensure Up up Down down No joke Check thorough preflight check especially important relative line tension First flights always nervous time dont want have deal air plane wants fly closer Continued page 137 Charilel Dave Hemstrought pleads innocent charge built humongous Mig Stunter L seen 83 Nets its Windy Urtnowskls joy say like flaps your-Stunter Frank McMiilans Rabe-style semi-scale Martin-Baker Stunter R has grandaddy flaps flew 1982 Nets Lincoln NE Hes real Pro Stunter John Hill League City TX built Rabe Mustang L features molded-balsa fuselage 10-oz 60 engine ComoISTIHiii let fly weight 51 oz has shock-absorbing landing gear Frank Williams photo Bruce Gifford Jr sends fine photo R Dick Maddox fine Olympian Foam-winged craft files Supertigre 46 power weighs trim 50 oz 58 Model Aviation Vhen first met him kept telling asnt greatest craftsman anted work himself Two ears later couldnt find anything ens aircraft less perfect Ken made first flight pride nd joy July 4 1984 flew beauti ally needing minor adjustment ne brace wires trim out pent some time fiddling landing gear amping minor adjustments iade flew off required number qualify cross-country [ight off Oshkosh Ken came back Oshkosh last year ith Grand Champion Replica award hortly thereafter flew Gee Bee e Blakesburg EAA event came ome four trophies including Best eplica Most Unique Monoplane est Workmanship Owner mplimented him winning ways e just smiled said plane out better thought would original Model Y registered [R718Y Ken tried get number ad settle NR7l8L Kens Gee Bee powered Lycoming R 680-13 engine f 300 hp swinging constant-speed prop ruise speed 140 mph rate climb fantastic 2500 feet per minute npty weight 1792 lb gross eight 2500 lb Kens Model Y little avier original due elec Ic starter radio equipment Ken will flying magnificent CL Aerobatics/Fancher Continued page 58 length line use easiest way give away line ten sion have airplane roll toward pilot unsettling phenomenon can caused Warps item No 15 under Line Tension Trim Objective Misaligned Flaps item No 16 combination both addition inadequate Tip Weight No 3 will allow plane roll toward pilot both upright inverted flight check warps misaligned flaps very carefully view aircraft rear vision has trailing edge flap exactly centered wing flaps aligned both should bisecting respective wings twist flaps align check wing warps again view trailing edge flaps cen tered slowly move airplanes rear end upwards away watching trailing edge flaps relative top wing As trailing edge moves away flaps will start obscure view top wing should equal ly flap starts cover its wing faster other wings warped Investigate closely determine remove warp rough initial tip weight can arrived age-old fashion adding weight until outboard wing drops easilybut rapidlywith airplane supported crankshaft tail using equal-span wings add enough cause wing drop smartly proba bly another e should get ball park ship full-fuselage type probably have built desired Engine August 1985 137 Model Y 1985 Nats Westover Air Force Base early August Hes long time modeler AMA member Ill able show Ken area Gee Bees came finally get ride AMA friends will get close look magnificent airplane Can guess what Im building Scale competition year PAW DIESELS Englands Finest 049 35 RIC STD Send S 100 list Eric Clutton 913 Cedar Lane Tullahoma Tenn 37388 * SCALE DOCUMENTATION * SCALE DRAWINGSMODEL PLANS PHOTOS 1985 KS EPLA-TECH INTERNATIONAL AIRPLANE CATALOG48500 MC KENZIE HWY $300VIDA OREGON 97488 KWE GIVE YOU CHOICE SCRATCH BUILD KIT BUILD OR SOMEWHERE IN-BETWEEN SCRATCH-A-PLANE offers finest engineered plans available complete full size templates evely part finest formed cowls canopies wheelpants heaviest practical gauge ADS Butyrates hut now offers T-6 aluminum landng gears pre-bent music wire landing gears cabanet v-struts plus complete wood paks AAA quality Balsa Aircraft grade & Lite-Ply Naskan Sltka Spruce Apply templates supplied plan pak balsa plywood Spend few hours cutting out ail parts hobby band saw construct finest flying easiest building kit youve ever owned WING SPAN 84 ENG 124 STROKE ROLLED PLAN PAIC $2495 COWL FENDERS & WINDSHIELDS $3995 Rose offers 4 stroke performance dream about its optional flaps swept wing offers thrills experienced pilot yet docile enough trainer 35 SCALE GLASAIR WING SPAN U ENG 2 Cu IN QUADRA ROLLED PLAN PAIC $2495 COWL CANOPY & WHEELPANTS $4495 WING SPAN 70 1/2 ENG 2 CU IN QUADRA ROLLED PLAN PAK $2495 COWL $1195 CALL OR WRITE FOR COMPLETE LISTINGS AND PRICES OF DESIGNS AND ACCESSORIES SEE YOUR HOBBY SHOP OR ORDER DIRECT SHIPPING CHARGE S300 COD ORDERS ACCEPTED VISA & MASTERCHARGE WELCOME SCRATCH-A-PLANE 2080 ATHENS AVE REDOING CA 96004 916 244-4190 IF YOU CAN BUILD KIT YOU CAN BUILD SCRATCH-A-PLANE J SAILPLANES WORLD 1501A Coff Rd Modesto CA 95355 Offset item No 6 its profile ensure have washers under front engine lugs provide offset rule thumb Ted use about 11/20 offset 40-46-size ships up 30 l9-35-size ships number good planes have built no off set Theoretically should work fine Practically speaking Im comforta ble little bit good measure Same story Rudder Configuration item No 8 large diversity opinion exists concerning value rudder off set tension leave own devices Nats has won air planes Rabe-style wiggly rudders airplanes no rudders No big deal say Again weve already dealt CG its set now Ditto leadout location Prop selection deserves some attention terms line tension hedge bets choose prop little pitch little less diameter predict will finally use Either choice wrn pro vide slightly better line tension first flights would opt less diameter especially often case new Stunter has new engine well Less diameter will reduce load engine allowing little horsepower provide additional line tension Dealing props brings us Speed Control Trim Option No IV Aside prop selection preflight consideration line length discuss ing line length talking about appar ent speed pilot airplane speed dependent thrust drag pilot sees long takes cover given segment circle Pick lines moderate length airplane/engine combination speed lap times may slightly faster eventually desired will improve line tension almost nothing can terms Tracking Trim Option V trim stage game Weve built-in aircraft parameters weve located CG item No 4 specs previous step weve already set Flap Relationships No 5 Further track ing trim will depend evaluation Sailplanes International Krause MultiPlex Wan ltschek Wik & Roke Sport-Scale-F3B European Hardware Accessories Send $500 Cat & Price List 209 577-0506 airplane flight Finally Uniformity Turn Trim Op tion VI will pretty much have wait inflight evaluation Check once again insure flaps elevators neu tral same time eyeball wing stabilizer carefully convince self really did build no Decalage item No 1 ie both stalled fuselage zero incidence right Double-check lines kinks give control system reason able pull test lets fly advised Flying Phase trim will ap proach trim objectives encoun ter rather Trim Table order have doing simply allow discussion have flow approximates actual progression flight trim possible making first flights new ship less full tank gas has nothing flight trim sake engine Any number things can make poor engine run new air plane Engine cooling can inadequate new fuel tanks can release impurities fuel system fuel tubing can kink etc Almost anything can go wrong will cause engine run lean hot youve taken off full tank gas can facing eight 15 minutes torture brand new engine An exper ienced helper can hold airplane attitude will ensure fuel pickup tube until launch Done way engine does overheat chances much better running out fuel before runs permanently out gas Besides first flight two will serve check few trim parameters . addition allowing us check things like loosening components tank location engines cowlings etc timely basis very first indication trim mistrim will takeoff itself airplane lifts off smoothly climbs grad ually flies level excessive attention grooves little high low can reasonably assured CG response rate handle neutral ball park other hand 138 Model Aviation 7 1/4 SCALE SHINGLETOWN ROSE 1/4 SCALE FOKKER DR-i Johnnie Casburn SJig-built balsa fuselage C New Cap 21 IC New Cap 21 1st$239 95 SPECIAL. $15995 Prices Subject Change Without Notice eaps air invitation r tries stay ground until orce off hunts level flight and/or equires constant control input mainam level flight probably have prob em Further evaluation will necessary As long up cant come lown until gas runs out lets try fly traight level have experi nced helper check wings anking tendency Check both upright md inverted flightunless upright light outboard wing noticeably town wing down extreme mount going inverted will likely esult ship banking toward ausing loss line tension youve lone good job checking Warps Trim Option 111-15 Flap Alignment Trim Option 111-16 shouldnt ase outboard wing up fly ng upright down flying invert d vice versa dealing varp flap misalignment Recheck traighten convinced wing aid flaps straight then weak flaps oppose roll bet er solution add small tab utboard wing flap bend Ike small aileron level wings outboard wing either always up r down regardless direction light have either too little too nuch tip weight respectively Add sub ract weight trim level youre lucky weight will good both level light hard maneuvers Well check dice later Ted Fancher 158 Flying Cloud Isle oster City CA 94404 CL Scale/Boss continued page 59 @ 1 pt/laplO pt max Realistic land inglO Pt max 5 Optional acrobatic point bonus LooplO pt max Wing verlO Pt max Touch-and-GolO pt max 6 Static scale Three-view photolO pt judginglO Pt max As can see rules straight rorward rather simple would Foam top back covered 1/64 plywood Fiberglass cowl beautiful canopy hinges torque rods plus other machine cut sanded parts Engines 60 two cycle 60-90-1 20 4 stroke Ready built 1/64 plywood covered wing Johnnie Casburn Manufacturing Co 571 5-SE E Rosedale Ft Worth TX 76112 Day 8171451-1570 t 817/572-1 452 hope after passing contest board Final Vote will allowed remain way long possible Lets deluge Scale board load rules changes supposed improve event before gets off ground cant help feel regular competitive events suffering excessive number rules changes have made complicated scaring off prospective competitors wouldnt want happen new rules activity has great potential vehicle getting young folks interested model aviation activity clean no fuels no noise speak can flown indoors outdoors very small space just kind activity suited grade high school shop programs flying portion activity taking place schools gym AMAs PR Dept preparing handout sheet activity group interested obtaining copies drop line Geoff Styles AMA HQ As can see accompanying photos planes being flown Black Sheep Exhibition Squadron highly developed fly well Most models use Astro Flight 020 035 motors carry battery power onboard models rather through flying lines case Clancy Arnolds electric CL flying Tony has indicated will sharing some expertise type flying us future meantime anyone else out has done CL Electric flying wishes share his/her experi ence others drop line two some photos Letters stripes looking easier convenient way mak ing applying lettering stripes latest Scale creation Coverite Graphics new Trimsheets Vinyl Stripes might just thing Both items made non-color-bleed ing cast vinyl other Graphics let ters numbers stars might familiar Both new items available five colors red white black blue yellow PRO-CLAM P Tuned Pipe Clamp $250* pipe included ITS SNAP CLEANER Polisher Brass Tubeing Replacement HEAT BENDABLE EZ-Lne DIVISION OF BAR/RICH SALES CO 2 FAIRWAY HANNIBAL MO 63401 314 221-8e03 aster it MANUFACTURERS OF SPORT PATTERN STINGER II PEPPERMINT PATTIE 60 TAN PCPPERMINT PATTIE 40SPORT/SCALE PEPPERMINT PATTIE 15 HIPERBIPE August 1985139 THE ONE THAT WORKS Glider Pilots Take Note SUPER SHINE SUPER SLICK 8oz $4 95* $1 29* Add $175 Shipping Handling Dealer-Dist Inquiries Invited