I have a 19ft Ranger, powered by a Evinrude 175. Current prop is 14.5 dia, 24 pitch 3 blade. Runs about 5200 - 5500 when trimmed properly at WOT @ 60 - 65 mph depending on load/people. I fish mostly, and this setup is fine. However, the wife and some friends want to do some tubing with it...