ORIGINAL: freakingfast
I was offered several suggestions;
1# Up reflex the ailerons, but a some point in flight it may still flutter when the aileron is used.
2# Cut away the last 6 ½” of the out board aileron and make it part of the wing (non movable).
3# Use a servo with metal or titanium gears, eventually the servo or the aileron may still fail since the flutter is still there.
4# remove the covering on the aileron and put a thin veneer of balsa on each side to make the aileron a bit thicker than the trailing edge on the wing.
5# Add a counter weight at the out board aileron end.
6# Increase the mechanical advantage in the servo’s favor, but this will amplify any apparent gear train slop at the control surface. It’s about one to one now, the servo is slightly advantage (shorter arm).
Too many choices
What would you guys do?
freakingfast:
I would follow advice #5.
I believe that any control surface flutters because it has mass.
That mass or weight is all on one side of the hinge or pivot line.
The turbulence of the air makes it reach the resonance frequency of vibration.
A balanced control surface cannot flutter because it has no mass, from the point of view of the flow of air (same weight on both sides of the fulcrum).
Also, adding less than the weight of the aileron as a counter-balance will change the resonance frequency of vibration to a different value, that your model may never reach again at those speeds.
I suggest you to read through these old threads:
http://www.rcuniverse.com/forum/m_77...tm.htm#7766711
(Check pictures of Post #5)
http://www.rcuniverse.com/forum/m_79..._1/key_/tm.htm
Best regards!