WingFlaps wrote in
:

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?



hmm, true.

Well, flutter is also down to flexibility. All kinds of flutter in all it's
incarnations.
So I suppose it could be said that flutter is a species of divergence.
Dunno, I'm not an engineer! What I've given is the dumbed down pilot
version of flutter.


Bertie