On small airplanes, I like about 10 degrees movement either way for flaps. I think more movement gives too much drag on a small airplane. I've had two Shark 15 profiles with TD 09 and flaps. The weren't as fast as the Flite Streak, and did fine on 55 ft lines. I couldn't say if they turned better than the Flite Streak. Both airplanes flew very well, and I flew them in Classic, or PAMPA Advanced, stunt contests.