Hi Lou,

Can you explain the different "modes" that provide energy coupling between the fixed surface and the movable surface?

And is it true that a movable surface could never flutter on an "infinitely stiff" mount? In other words for the aileron to flutter, the wing has to be moving and providing an energy coupling back and forth to the aileron?

Sorry in advance if I butchered the terminolgy, I am almost certain I did!

And Bruce and whomever else, feel free to jump in.

Thanks in advance,