I run an APC 11-4 on my Jett .46 in a fun fly plane. As long as you keep the top end RPM at 16,000 or above it runs great. Dont overprop it. The Jetts are not made to lug big wood (or plastic) slow, but then again if thats what you want to do go with a 4 stroke.

Take a good look at the Irvine's also. My .53 is still gaining power after a whole season of constant use. Nice engine, often overlooked.

AJC