On the 66" Extra, VectorFlight recommends 2 degrees right thrust. The 58" should be similar. I had none when I first got it flying and it would start rolling to the left past the first quarter of the loop. I also needed to apply quite a bit of right rudder while taking off in order to keep it straight. After adjusting the right thrust to about 2 degrees, it now takes off with no rudder input and does the roll pretty straight.