The manual call for a 40 size motor or .52 4 stroke. I have just about finished the second PITTS. I used a .46 OS LA engine this time, which is considerably less powerful than the TOWER HOBBIES .46. Also, I am going to modify the way the 2 wing strutts are attached to the lower wing to try to reduce the force on the little tabs protruding from the wing. I used 2 JR MC35 servo's for the ailerons. I had used hi tec HS81's on the first one that crashed. The gears stripped, but that was undoubtedly due to the crash. The JR's seem to work fine. Tell me when you get to the point of mounting the wings what you think about the struts bending like they do.Nowhere did I see any talk of using a 32 size motor. Where did you see that?