ORIGINAL: opjose
True, but this is VERY RARELY the cause of flutter on these small 3D planes the OP is talking about.

ORIGINAL: psuguru
Oh no it isn't

ORIGINAL: opjose
Oh YES it is.

ORIGINAL: opjose
And even then if this does occur a better fix is to re-inforce the flexy area with an inbedded CF rod or other similiar technique, that is actually effective.

ORIGINAL: psuguru

Better than eliminating the cause of the flutter?
You're writing rubbish man.

ORIGINAL: opjose
Slowing the plane down is the best fix.
In lieu of that what I wrote is applicable.
I would suggest you experiment to see before causing others to put planes in the trash bin.