On Dec 26, 12:15 am, Bertie the Bunyip wrote:


I saw a video of a twin Comanche on You tuvbe flutterign badly during
tests, but I can't find it now. The other ones there don't illustrate it
very well excepet maybe this one.http://www.youtube.com/watch?v=
8D7YCCLGu5Y
No control surface, but it's the flexibility of the wing that's causing the
problem. It's increasing in amplitude because each subsequent oscillation
is further and when it moves further it increases alpha which in turn
imparts more energy to the next oscillation..

That sounds like divergence (not flutter)? Divergence is due to the
flexibility of the structure and a great example is Tacoma narrows?

Cheers

That