"DonMorrisey" wrote

My friend
is convinced it had something to do with the washout of the wing. The
wing is a NACA 4413 Airfoil, modified in that it has no undercamber on
the bottom, the bottom is flat. The washout, which is built into the
wing during construction, is a couple of degrees. The plane I am
building uses the same wing/washout. I have done research but can't
find anything specific linking washout to flutter.

Any thoughts on this??

Since we don't know the design of this plane, I have to ask if the aileron
goes all the way to the tip, or is there a small region at the tip where
there is a little plain wing.

I ask because the vortices peeling off the wingtip striking the aileron can
help to excite flutter. I don't have anything to site, but I have read this
before, and it does apply to model planes.

If balanced completely, and there is no slop, this might not be a problem,
but having it attached that far down no doubt left some play in the system.
--
Jim in NC