ORIGINAL: wingsman
I have a high speed trimming problem as the dd tends to start a right roll when the speed peaks. After fixing this problem,
My first Dust started doing that after about 80+ flights. I stripped the covering off twice looking for the problem and reinforced many areas and never did fix it. After the last flight I didn't have to worry about the trim problem (see photo). I finally built a new one and things were fine. I would be very interested if you do find the problem.