Hi Jim,
ORIGINAL: hilleyja
So, again, what caused the flutter that caused the servo damage?
When I worked in aerospace on a flying wing UAV, one of the PhD's was demonstrating a flutter mode with a little balsa glider. He weighted it right and he could toss it and you could watch it flutter right across the room. You do not have to go fast to have a flutter, but most reasonable well built planes need to go fairly fast to exhibit it.
You might have done nothing wrong, there could be a design flaw. Either a very flexible wing, a flexible servo mount, a flexible linkage, anyhing like that could cause the flutter speed to drop very low (remember basically everything has a flutter speed).
The only way to almost completely eliminate the chance of flutter is to balance the surface, and that involves making the CG of the movable surface coincident with the hinge line. I do this on very fast turbines, but in my experience most models do not need it if the wings are still enough.