Tommy, will the 3.2 class fit the size constraints I have as far as firewall to thrust washer distance?

If I need to run a 22" prop, I'm sure I could live with that. I just don't want to have a prop that's barely larger than the cowling, as that looks majorly silly to me. Even a 20" might be okay.

fryfly, I certainly don't want to damage or overheat the motor... I'm just thinking that there's got to be a happy medium for this plane.

canman, the reduction drives look good, but I think it would be way too long for my application.

Thanks for the ideas.