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The correct way to balance ailerons is neutral around the hinge line and remember this -
1. Control pushrod attachment will add a mass ahead of the hinge line during 1-G flight. In the case of engine/prop/speed/turbulence induced wing/aileron vibration, the pushrod can also load and unload on the aileron - but ahead of the hinge line.
2. At least in 320/360's, there is plenty of pushrod "lash" in the aileron system - this can lead to "buzz" even with weight balancer stiffeners. Ailerons at cruise neutral have very little "load" on them so, just a suggestion, consider rigging both ailerons slightly "up", thus generating a wee air load to eliminate the lash dead band.
Scott Krueger
N92EX
PS On my airplane, the 1/2 moon weights extended almost the full length of the curved leading edge before painting. I had to add about 1.5 inches of 1/2 moon weight after painting. I don't have the stiffeners that many have mentioned (this was a slow build 320, kit circa 1989) and, rigged slightly up, the ailerons exhibit no tendency to vibrate. Perhaps the number of times I heated the curved leading edge for fit (before and after glassing) added to their stiffness. No micro fill was used to finish the fit to the wing.
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