CONTROL LINE AEROBATICS THERE ARE MANY times wish could deliver new airplane someone really good sorting out problems pick up laterall trimmed out us simply possible have struggle endure means behooves us understand trimming process have some excellent articles Flying Models PAMPA ModelAviation urge seek out read thoroughly PAMPA Products Box 2026 Loomis CA 95650-2026 Tel [916] 721-4328 Call Mary Gebhart Bob Hazie very narrow area trimming want discuss tip-weight adjustment Until advent tip-weight boxes early 1970s plans called approximately e precisely rolled up empty Ambroid tube As adjustable feature became popular experts said load tip until wing hinges throws certain spotslike top hourglass outside squares Actually thats good advice long observe well build straight ballpark weight interrelated factors should discussed can have some appreciation what can happen playing weight far off small changes can get best settings recent column discussed line length trimming element tip weight factor balances drag lines lines use directly related amount tip weight probably early airplanes could more-or-less standardize ounce because line diameters length usually similar changed airplanes rules power plants evolved Before go need make general comment about wing asymmetry lack years equal-panel wings fashion Some said honest trim problem balance model aerodynamically outboard wing moving faster inboard wing Typically equal-panel wings require good deal tip weightsometimes two ounces classic days Stunt designs called 1-inch longer inboard wing naturally suggested lot less weight because extra inboard wing area lift balanced higher speed outboard panel plans era called e less tip weight Another factor needs introduced aspect ratio wing classic days typical ratio 51 551 Again meant actual tip weight relatively same position design design same amount would serve well last 15 years designs changed aspect ratios increased 148 Model Aviation Wolgasts new Pentastar based Junar wing Flies very Robin Sizemores ST 60 Hurricane Stunter Looks very scalelike well ST 60 Won Expert Southwesterns Dallas TX air good flier rough conditions Jim Thomerson giving Control Line another try original 740-square-inch flying wing K&B 40 power Sig Twister Larry Shoemaker Adjustable tank leadouts weight box OS 35 Flies well 34 ounces center gravity positions adjusted farther rear airplanes got larger meant ballpark number really went out window wing asymmetry generally reduced approximately 3/4 inch About time another feature started show up newer successful designs flap area balance asymmetry longer inboard wing flap area inboard created possibility unequal lift general solution add little area outboard flap Typically accomplished adding little chord outboard flap tip 5A2 good number course affects amount tip weight Now Ive laid out some factors equation Id like discuss few problems Ive personally encountered have really chased tail trimming new airplanes situation perfectly straight wing too much tip weight wing seemed roll change upright inverted same time outboard wing flying low Trying get wing level tweaked flaps little correct it did roll induced thereby starting chain impossible situations couldnt get wing fly correctly through maneuvers because competing trim factors Finally started removing tip weight retweaking flaps weight removed the flaps came back neutral better airplane flew Everything got cleaner cost lot aggravation analyzing problem working tip-weight solution go absolute amount start Some airplanes end up no weight Realize no builds airplanes have wings weigh same however start designers suggestion Work tip weight before tweak flaps assume true wing outboard wing hangs down remove weight see can get wing ride level tip weight opposite condition exists outboard wing high add weight After have wings level nearly evaluate airplane see what have least way wont go down blind alley like did generally want arrive trim least weight out end wing Its 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