There is one other difference, Speed. My engine spins at up to 28,000 RPM, roughly 3.5 to 4 times the speed of your engine. It can do so since the prop blade tips will never go supersonic and become ineffective like would happen with an 11-12" prop on a similarly sized aircraft engine.
Enough on the boat. I think we've derailed the thread long enough.

Getting back to aircraft, Doctor, have you had a chance to read through the instructions on your radio yet? I'm a bit curious as to your thoughts on the instructions at this point