Intersting replies and some contradictory advice. To Rodney, if mass balancing does nothing for flutter, why is it found on various full size planes?

On the Funtana 90, i have noticed that the ailerons are very large and have a different structure to the wing i.e they are cross braced and are stiffer IMO than the wing structure which in typical fun fly fashion has relatively few ribs. I wonder if this contributes to the problem on the F90, which for those that havent read the threads, is a flutter incident at moderate speed leading to catastrophic failure of, usually, the right wing. On my plane the flutter stripped both servos and lead to some cracking and interior damage to the wing ribs. The ailerons and hinges showed no damage at all...

The mass balance idea is to stave off the ailerons tendency to flutter thus increasing the Vne at which flutter may occur making the plane more tolerant of higher speeds.