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A soft pencil , like a HB ( not to sharp ) or is it 2H , or a felt marker - should wash off . later . maybe ! .
So getting a dead aft ' neutral / center line , line / mark - 1/4 or so long REFERANCE . then hang from a leadout . CAREFULLY . they hurt your foot if you play Tarzan & the nail pulls out . ( oops ) Just as well the foot was under it .
SOME , just hanging , the FLAP ( & elevator ) is just ' so far ' . a bit of weight on it to get FULL DISPLACEMENT of control surface . What with paint , newness , angles & oiling hinge pins // etc .
a dot at the flap T.e. , in line withit . A offcut of 1/16 six in long , to bridge a gap , if needed . So its ALIGNED EXACTLY . the dot . AND the other one . THEN ' are the Two Dots equispaced from your megaacurate C/L line .
Some of mine want the flaps & elevators grasping , after storage , and leaning onem Full deflection ( or more ) to FREE OFF for full movement . THEN carefull glareng at surfaces to see theyre exactly alinged side to side .
The TEST is to see IF it sits at Equal Deflection , with just ts own weight . Dosnt hurt to glare at fuse to see if its just outside level , too . However , whacking / leaning onit , SHOULD get exactly equal deflection .
Till you decide otherwise . as in if it NEEDS ' pre set ' to equal the turns . Just to try'n de muddify the waters . On that . Pretty Basic first principle set up .
But Neg Stabs useless . A iota + usually benificial , with the stab. up from the wing centerline . Im starting to think unequal all hights , gets a ' pre load ' that steadies & halts ' hop ' / bounce , as in it ' locks ' outa squares etc better , not so easilly deflected either . but traks as youd want it . Hopefully . We shall see . Engine & wing centerlines , anyhow . So it follows aft too . But I dont usually have 25 % tailplanes .
so almost irrelevant waffle . Or regurgetation .
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