I placed a OS46 AX in a WM Skyraider Mach1 trainer and that plane just kick-ass!
The plane is fast, responsive, and can go vertical and do the basic areobatics with
ease. My instructor told me he has flown lots of trainers with .46 size engines, but
he said the Mach1 plane was unique. He said, it had lots of torgue, which is the result of
a good engine/plane combo. Even after I solo, I will keep the plane and engine.
It's just a fun plane to fly.