Great [link=http://www.rcuniverse.com/magazine/article_display.cfm?article_id=1289]article and vid[/link] regarding flutter.

The a/c could have easily been lost after some non-factory mods made it flutter prone, skip to the 1 minute and 3 minute marks in the vid if you are in a hurry :-)

I never knew wings could flap so much !!