C PYLON RACING Bill Hager FOR MOST racing season about over some however last very important race year about end October National Miniature Pylon Racing Association has its annual Championship Race usually competitive race year top fliers country invited come up list people NMPRA has divided country districts somewhat like AMA has done districts has district vice president job coordinate racing activity area keep track top fliers have point system awards points flier according finishes race end fo season flier uses best six race finishes come up total season top 20% district qualified Championship Race Also top 10 finishers AMA Nationals NMPRA officers past Championship winners automatically qualified race location rotated between California Texas Florida year year race will held Titusville-Cocoa Airport Titusville FL will hosted Moonport Modelers Next month will have full report race have past asked have helpful hints ideas send will pass readers response plea has too great Come guys know can better John Jennings good friend accomplished Pylon flier has put together some very good tips trimming Pylon Racer go fact matter whole lot about trimming Pylon Racers racers ignore simply seem have time Pattern fliers years have using some techniques apply directly Pylon Racing laws physics dont usually change event another Seventy-five percent trimming problem can corrected simply building straight true airplanes what does person dream airplane test flown goes barfl barfi following steps should undertaken immediately 1 Check CG rebalance exactly accord ing plansif plans say 275 leading edge doesnt mean 29 2 Check lateral balance ie wings simple way to grab spinner preferably motor running have someone put finger under tail skid watch see wing drops start ing trimming process wings should initially balanced Any unbalance can corrected driving nail wingtip lighter wing 3 Check rudder warps cant remove just take note 4 Check wing warps holding up light sight directly through dihedral joint rear eye Now avert vision look wingtip compare bottom both tips warpstake note 5 Check distance between tailpost wingtip Triangulate correct discrep ancies shifting wing saddle possible Take note discrepancies 6 Check aileron differential djf ference between left right throws measurewith calipersthe up-throw left aileron down-throw right aileron fulldeflection left turn repeat right turn also difference between full-deflection mea surements should less 10 percent Most Formula use 3/16-in 1 86-in ofmax deflec tion Ten percent about 1/64-in much difference eh adhered alrplane will roll axially out bank can have appearance tuck climb-up turn Causes differential can Aileron control horns raked forward backward difference between fore-aft positions aileron control horns ailerons setting neutral wing surfaces servo arm standard neutral position done no substantial warps present airplanes will fly straight bad tendencieslike tuck-down left steep pylon turnexist may absolutely correct Adding right wingtip weight adding right rudder trim shifting wing saddle aimed right Any combination above will correct tuck usually will require slight amount left alleron trim As last resort can add right thrust no warps present airplane still persists recheck CG shift slightly rearward 125-in time NotePolecats require certain amount right wingtip-weight correct above rules also apply airplane climbs up out pylon turn Just reverse directions appropriate correc tion As tucks can corrected right rudder trim use alternatives answer too much right rudder can cause yawing down straightaway slow down along some funny tendencies upon coming out turns Weighting wingtips works well because turn radius decreases centripetal force weighted wing creases causing greater effective force correct tuck same technique can used type Pylon Racer Lets hear some tips ideas See next month Bill Hager 4622 Bridgeport Garland TX 75043 SAFE FLYING IS NO ACCIDENT 36 Model Aviation top finishers Dallas RC Clubs June1980 race Lto R Ed Rankin third John Jennings first Maft Smith second Whit Stockwell left comes Out retirementto help fairly new flier JP Hannway fly 0500 What need veteran fliers helping new guys get started