I have to mention the Kyosho Stearman. I bought it as a scratch and dent plane from Tower. it came minus the horiz stab and elevator. I made those parts by scaling from a Midwest Stearman. I crashed it a half dozen times. Stall spin, etc. Finally I decided to put it back together and check wing incidence. It was off by several degrees. i set the upper to minus one and the lower to sero and it flies great. With an arf, i never bothered chccking anything. but it makes a world of difference in flight. Too bad I almost destroyed the plane before getting it to fly right.