There was a problem in my execution. The Giant Super Sportster apparanty has sheeted ailerons that do not have internal ribs. Ipoked about 30 holes with a needle searching for the internal framing and never found any. Finding none Iwent to the outside edge (I researched several models that put the weights there). They did alright until I lost a wheel collar and threw the wheel - resulting in a ground loop. Tore the starboard weight and strut off. Did not hurt the hinges or aileron, amazingly.By luck it just spun around on the axis instead of pulling straight back.Still, that might not be the ideal location for a low-wing model.

Best solution Ihave seen for flutter is to SLOWDOWN. Most guys who seem to have trouble are playing the throttle like an on/off switch. The other best proactive remedy, as John said, is to eliminate slop in the linkage. The DuBro syle (aka: relatively inexpensive")ball-and-socket connectors have simplified this immensly.