RE: What does flutter sound like?
Re: Sounds like:
Like a medium to high pitched buzzzzzzzzzzzzzzz. As if you had some covering material flapping VERY fast in the wind.
Think a lower pitched kazoo like sound.
Re: Isolate
Yeah risk doing it again...
What engine do you have in your trainer?
If you have an engine larger than recommended and/or with a higher pitched prop, you run the risk of causing flutter.
If you don't stop it immediately, you could see your plane disintegrate in mid air, almost as if it been hit by a missle.
There is a video somewhere around here of I believe it was Chip Hyde flying a Funtana with an oversized engine.
During what appeared to be a normal pass, you can see the Funtana come apart just above the tree line.