All,

This is an awesome discussion guys.

Intro... Mechanical Engineer, flying RC for less than one year. Several patents on the wall. Expertise in mechanical design and innovation. Out-of-the-box thinker...

I brought this whole discussion up in the "Funtana 90!" thread several months ago, but it was way too technical to draw interest. See the launch of the discusstion here:

http://www.rcuniverse.com/forum/m_16...86/key_/tm.htm (post 2575)

The thing I think you guys touched on that I believe is on track, is that of the wing and aileron acting as a "system". If you go back in the F90 thread, there is a photo sequence that was clipped frame-by-frame (see upload) from a video of a flutter failure on the F90. If you look very closely, you can make out the wing twisting (resonance) just before catastrophic failure.

There is so little post-mortem evidence to see, but this is pretty valuable. you can see the WING is occilating, probably initiated and excited by an aileron flutter.