...I'm going to hang an older OS .91 four stroke on this thing...
I have a Saito 91 and a 14oz tank and flew 24 minutes last Sunday without refueling. It does not have anti-vibration mounting.
I was considering flaperons just to experiment with. I have heard good and bad on the flaperon concept.
Dirty up the airfoil just a little with either flap or spoiler seems to help smooth out landings. I can’t visually tell the difference in speed or flying but the tendency to bounce is reduced. Both flap and spoiler seem to have about the same affect.
Bill