Good Buddy has a Cermark Pitts.

Satio 150 and Junior corless BB servos all the way around. I don't know which ones.

Aerilon FLUTTER BAD!

Changed linkage, with no slop. Not there was much.

Flutter.

Changed servos, aluminum horns, 4-40 rods.

Flutter

CF rods and airfoil rods to the bottoms.

Flutter

Pull hair out. Too pretty of a plane to hanger.

Someone suggested putting counter balances on the top aerilons. A few cocktails later we put on home made counter balances. Flew the next day, NO MORE FLUTTER!!!

Granted, the flutter was evident from day one and the counter balances my have cured it up front. Should Cermark have changed the plane? I donno. This is a plane that would fly on a 90, we have a 150 on it. We just figured it was so over powered is was our problem to fix, not Cermarks.

As you know, flutter in a tiny amount will cause structural failure quickly and possible unseen damage.

If you have one, put on a counter balance.