The amazing thing about flutter is that by the time you realize you have it ....it is generally too late. This happens on full scale airplanes also....it is very dangerous testing.

I actually got wing flutter this weekend on a model...but luckly got it slowed down before it went divergent (wing break). It was a 1/4 scale Balsa USA DeHavland (a great looking model). We installed a bit big motor for this model (and it is a Huge Model)..a DA 85...it is supposed to have a 45 or 50 in it...well I knew it was going to be overpowered..so we took off 1/8 throttle...and we inched up on the speed over two flights untill we got to half throttle...then the wing started to oscillate...well we are going to stiffen things up a bit and maybe borrow a restrictor plate from Nascar to limit the power and speed.