I always run an 11-5 APC on my 46 FX motors (except when I have the Ultrathrust muffler hooked up). I tested my new AX on my LT-40 with an 11-5 and the difference was very significant- the heavy trainer was almost unlimited with the AX! I put the same AX motor on my Nobler with the same prop and was surprised that there wasn't much of a difference. But the Nobler is a relatively light, fast plane.

My conclusion is that the motor has more torque and we will all have to learn how to prop it to get the most out of it. I'm going to try an 11-6, then an 11-7. I don't have enough ground clearance to run a 12" prop on this plane.

A 12-6 seems mighty big to me, but then who knows...

Walt