Oak....
I havent used these servos on anything that required high torque, but they are rated at 91ozs, but the key seems to be that they are plastic geared.
I had a good six or seven (?) flights on it without a hint of flutter, and it struck basically without warning. I followed the directions in the manual ( although I didnt seal the gaps, because there really werent any ).....I think it was a structure problem. I flew a new one yesterday with the 9451 servos in the ailerons, and once again, didnt notice any flutter......
I think I will use metal geared servos from now on in planes with large surfaces to be safe, but it still doesnt explain why this happened in the first place. I also changed the servo arms from the glass-filled Dubro to the H9 aluminum ones.
I didnt notice any oscillation on the servos, or anything out of the ordinary for that matter with these servos on the first one...otherwise I wouldnt have used them.
I think I would just use metal geared servos on this plane all around if I were you.....
Good luck with your plane......
BR289