I won't run a prop that big, i was going to do a high pitch pattern prop. Maybe a 13x12 or 14x14. I'd want to prop it for 11,500rpm peak.

Before the pilots get cranky with my rpm figure, the engine would never unload since it wouldn't be airborne. That and I don't care a whole lot about the engine; I did pull it from a dumpster after all.

I figure it would be pretty light running without a flywheel and ignition system.

On a side note; my wife isn't fond of the noise much, I usually break engines in away from the house or wait until she isn't home.