Bravo Two Zero schrieb:

What is rudder flutter ?

This is rudder flutter. (Actually, it's aileron flutter, but the
principle is the same.)

http://www.youtube.com/watch?v=kQI3AWpTWhM

I should add that this was a test flight done by the factory test pilot
and the wings were reinforced for this test. Standard wings would have
fallen off pretty quickly, as you can see in related videos.