[Putershark]

No two boats are loaded the same, nor have engines that develop max torque in the exact same RPM range. It takes time to get one dial in for your needs and hull.

Here again, that is why I recommend using this prop http://propulse.jetshop.se/ so you can adjust the pitch settings to give you a good base line to use in a metal prop going forward (if needed) and then keep this one as a back up unit on the boat that will not rust and weighs next to nothing