I have a stock 13x13 three blade. I don't have the powerslot trans, just the standard 1:1. I'm able to get a top speed of 43mph at 4800rpm's.
There are two people you can talk to about your prop questions:
Eric
eric@ojprops.com
800-359-9730
Bill Weeks
bweeks@acmemarine.com
888 661 2263