I've been flying an OS 50sx on a hanger 9 twist 40 for several years. This plane has a very thick airfoil and for 3D type flying the APC 13x4W gives me the best results. I also use one of the old Tower Mufflers on it
Last edited by restlessrocks; 10-12-2018 at 11:23 AM.
Reason: double post