Control Line: Aerobatics

ConE rot S Wynn Paul TWO ITEMS major interest Stunt fliers lead off month First 1981 Nationals will held near San Antonio TX needs volunteers work event Event Director Bill Howe 7769 Mary Lou Way Sacramento CA 95832 916 421-8866 eagerly seeking judges recorders scorers pit bosses pull testers site preparation persons etc work Nationals writing also needs Assistant Event Director people have asked writer what can PAMPA can something volunteering work Nationals Call write Bill Second John Poynter still making foam wings moved up demandingiob real job insists will still producing fine wing although little slower past Contact John 10261 Janice Lynn Cy press CA 90630 information sizes prices Les McDonald finished up 1980 adding King Orange title World National Championships years contest attracted 20 entries Jacksonville FL over last weekend December Frank McMillan finished second Les PAMPA Expert Paul Fewell won Advanced Jim Mitchell second Gene Latham won Senior-Open Novice Scott Baker won Junior Novice tank man Mike Mustain won Profile Stunt event Following closely behind questions about fuel tanks engines familiar get razzle-dazzle finishes some Stunt planes real answer WORK capital letters since writer hasnt covered anything about finishes some time lets look method used winner 1980 PAMPA Concours d Elegance award Gene Martine Jacksonville FL finish one-of-a-kind Mariner former winners award looking envy Gene assembles plane bare-wood state fillets brushes coat Hobbypoxy clear bare wood after letting mixture cure 45 minutes first coat temporary seal wood keeping oil hands off wood keeping dirt off surfaces Actually 1980 plane used Hobbypoxy No 2 glue first has changed 1981 attempt says clear actually easier glue Next brushes 100% clear unthinned dope using strokes keep building up too thick prefers Aero Gloss clear stage because compatible Hobbypoxy clear glue After second coat 100% Aero Gloss clear ready cover plane paper silkspan Up stage airframe should pre pared surfaces smooth true ready actual covering Gene says preparation uses vinyl spackling compound bought hardware store nicks clings Gene lays paper right up joints paper applied wet water overlap such wing panels advises paper ripped rather Cut edges will stay down paper wet uses Aero Gloss thinned 50/50 around edges paper overlaps about -in After paper dry brushes another coat 50/50 Aero Gloss clear sands lightly No 220 sandpaper followed brushed-on coat 100% Aero Gloss clear time Gene applies fillets using Epoxolite Yes fillets applied over Continued page 119 48 Model Aviation batics David Hemstroughts Classic design features unique cooling-air ring around/behind spinner foam wing K&B 40-power David Moncks Corner SC Larry Kruse photo isthe Marinerwhich lost crash atthe 1980 Natscaused bya control IInKTaIiure uene Martines ship just won Concours dElegance award featured foam wing OS Max 40power Aero Gloss paint Genetells finish Stu nter months column Photo Larry Kruse Lee Uberbacher hails Dallas TX model named Talon has built-up 54-in wing OS Max 35-power Sig paint Larry Kruse photo documentation suitable pictures Sport Scale event has become popular because much less work required preparing documentation book necessary must remember too much informationespecially conflicting informationis actually worse too little information difficult judge downgrade scale detail does have reference picture proper selection scale documentation extremely important would like give credit Dennis Thumpston format used preparing documentation used SNJ-5 presentation article authored appeared May 1978 issue ModelAirplane News excellent guideline follow preparation scale documentation whether AMA museum Precision Scale modi fied version Sport Scale Without infor mation would have able put together quality presentation absolute must Scale builder whether Control Line other Once have compiled sufficient documen tation three-views next step deter 1 size model wish build 2 wish build kit available plans draw plans yourself next months column shall discuss three aspects can determine best particular abilities desires desire make column informative possibly can because Scale modeling requires tremendous amount information Some information may appear future will original material nor will necessarily remember came will put column help interested modelersand hope out will assist furnishing additional information Send information Dick Byron 2506 So 16 1st Circle Omaha NE 68130 CL Aerobatics/Paul Continued page 48 paper whole plane lightly sanded No 220 paper fillets applies three coats 100% Aero Gloss clear brushed least eight hours drying time between coat Tiy touch fillets during time keep oil fingers hurting surface preparation Gene continues brushing two coats 100% Aero Gloss clear sanding very lightly No 220 between coats conclusion step should able use reflecting light method looking various surfaces shiny spots showing better simply means paper getting filled particular point Gene advises can either change Sig paint others keep Aero Gloss 1980 plane used Aero Gloss way final coats clear trim Either way remaining coats sprayed So start spraying two coats either Sig Aero Gloss clear Next comes sprayedcoat filler Gene uses traditional method talc clear ner says may possibly need two coats filler completely fill everything After lightly sanding filler coats remember Les McDonald said spent full eight hours sanding filler coat Stilettossee articles should spray two complete coats clear Now ready spray first coat silver youve never used silver before prepared real jolt because slight imperfection youve never seen will jump right up scream attention Now something little different Gene insists uses Nitro-Span Red Putty No 900 purchased auto body supplier fill small dings dents right over silver paint says will work Besides repairing sands wet No 400 paper second coat silver sparayed lightly sanded dry surface should perfect stage Now sprays coat cleara wet coat meaning slightly heavy Now ready color base coat Use few coats color possiblewhich will still cover everything spray light clear coat masking tape trim doesnt pull up base coat Apply trim paint seal trim two coats sprayed clear stage Gene tries take off tne eages tne trim paint completely out advises using wet clean rag Ajax Comet Soft-Scrub stainless steel sink cleaner get edges off will still some feeling separation Gene says have good touch can use No 600 sandpaper wet After thoroughly cleaning alcohol spray coat clear followed wet sanding No 400 paper use Rapidiograph pens hearts content followed light coat clear Now Gene ready final clear coats sprays 3-4 clear coats day ie 800 am ll:OOam3OOpmand6OOpmthen lets plane sit overnight Next day sands lightly using old 400 paper used wet Old 400 means used paper new 3-4 moare coats clear applied again sitting overnight applicaiton 3-4 coats April 1981 119 M ~ iflcations Th i mm 111111ca 1245 81 jfl-____ IlliIIIIi liii 111111 IIHIL1111111 III IIIWeight 12 Engine 91 line drixe unit 1 eperate detachahi presheeted wing panels 2 lreassemhiled fuselage frame 1 lreassemhiled stabilizer clevators vertical fin rudderU L 4 Epuxy Glass cnwl wheelpants 5 Furmed hatch clear canupy Wayne Ulerys outstanding design Leo Loudenslagers Laser 200 geared 90 offered Model Merchant nearly constructed model critical fuselage & control surfaces framing wing sheeting has done Just some finish up ready fly best available 6 Aluminum landing gear 554 E Fronton SI Brownsville TX 78520 Features * MOST STREAMLINED * COOL RUNNING * COMPUTED FOR YOUR ENGINE * NOTHING TO ADJUST * NO STRAPS NT FALL OFF * TAPPED FOR MUFFLER PRESSURE * LIGHT WEIGHT. 19 - 46 size approx 3/4 oz 50 90 size approx 1-1/2 oz * PROVEN IN NATIONAL COMPETITION LOWEST POWER LOSS PRICE $2000 POSTAGE & HANDLING 0 OHIO RESIDENTS ADOL SALES TAX 0 K & B 40 BAFFLE ADAPTERS AVAILABLE . AND STILL NO UNSIGHTLY STRAPS ONLY $200 ADDITIONAL ROBERT PAUL PREPAID CHECK OR 1462 ORCHARD GROVE MONEY ORDER TO LAKEWOOD OHIO 44107 US clear followed further wet sanding No 400 paper Nationals next day let plane sit two weeks wet-sand using No 600 paper Finally ready rubbing compound Start red compound white use Turtle Wax liquid rubbing compound plane should now ready very light coat wax wantOr use long tedious proccess neces sary top finish airplane worked Gene has worked very similar operations just about everybody wants beautiful finish Stunt plane information stunt PAMPA write Wynn Paul 1640 MaywickDit Lexington KY 40504 CL Carrier/Perry Continued page 49 models CL model Dave claims really improves low-speed handling downthrust airfoil result experiments model variable thrust line removable wings variety configura tions could tried common problem among Carrier models classes engine goes rich lean air must set too lean too rich ground get good run air probability getting good setting first time out low such model suction systems lean ground setting will often cause loss power takeoff Uniflow tank venting used Stunt models has single vent tube ending near fuel pickup tube tank supplies fuel under constant pressure pickup tube Under flight condi tions however pressure carburetor can vary considerably variation pressure thus fuel mixture caused acceleration lateral inboard/outboard positioning tank vent either atmospheric pressure crankcase pressure determines effect centrifugal acceleration fuel supply engine vent inboard carburetor centrifugal acceleration will increase fuel pressure carb speed increases vent outboard carb engine will go leaner speed increases effects reduced pressure systems just same model accelerates takeoff fuel pressure reduced greater distance end vent carb greater effect No would expect suction engine keep running peak speed ifthe fuel tank suddenly moved foot below engine effect takeoff acceleration Profile Carrier engine standard uniflow tank published details Profile Carrier fuel tanks few years ago primary feature uniflow vent location front tank have used type tank success no means adjusting vent location except putting spacers under tank accompanying drawing shows tank can fine-tuned get exactly engine response desired movable vent initially should set about 34-in inboard left side looking forward side tank use needle valve would set maximum engine rpm opened until first drop engine speed occurs setting can found consis tently avoids too-lean mixture takeoff Fly model note in-flight mixtureit will probably rich engine rich flight move vent tube out about i-in time until flight mixture optimum sure keep tank filled during process Once best setting found vent can soldered place final note pump-equipped engines subject same acceleration problems can draw fuel location output pressure constant An engine pump backplate must mounted cylinder vertical side-mounted will go rich flightperhaps too much compensated lean ground setting RichardL Perry 416 WoodhiliDrive Golds boro NC 27530 CL Speed/Hempel Continued page 51 joint Next form sheet aluminum around solid cone Start edge using fingers bend metal Work slowly dont crease metal use X-Acto hammer plastic head gently tap edge will lie flat match solid cone other edge same way Roll cone flat surface sheet metal will conform solid cone shape metal must overlap 1/16-in remain together have smooth joint Brazing cones Remove solid cone sheet aluminum cone must held horizontally joint top prevent flux running off Both hands needed brazing hold torch apply brazing rod Use pair needle-nose pliers hold cone Wrap rubberband around handles keep pliers closed Clamp pliers vise braze use flux right tube will get lot liquid few crystals crystals important part flux empty tube flux small bottle mix thoroughly brazing rod Use same rod apply flux along joint Light torch adjust center blue flame extends /4 5/16-in nozzle Apply heat along joint flux will change liquid white crusty buildup Now move heat small end cone As temperature increases flux will tum back liquid look like water Dip rod bottle flux put joint As rod starts melt move flame rod down joint dont remain spoi longer necessary Watch heat 120 Model Aviation DEALER S DISTRIRUTOR INQUIRIES INVifED 5121 541-3867