Was just speaking of the blade shape being of that type on their prop, not a knock at all. This prop is the older style for sure, changes were made on the Legend line.
I'm saying there is a point where the RPM will run away from the MPH, with an Acme or an OJ. I know you have run many props over the years as have I, but there is a wall they all hit. It may not be as deep as 300 RPM but there is a point.
You are correct about rake, number of blades will affect lift as well. Bow lift does allow for a little more MPH but will also increase the size of the wake. I guess we try and make the wake as nominal as possible with our props, for the slalom guys. The boarding props are a different animal all together, some of the rake and pitch distribution has changed on our designs for those props.
Johnson Propeller Co., Inc