[THEFERMANATOR]

Originally Posted by roffey

I thought the pitch on the prop was how far the boat will move with one revolution or rotation of the prop. So a 19 inch prop will move 19 inches and a 23 inch prop will move 23 inches. The limiting factor will be prop slip and over or under revving the motor. But as you say there is a bunch more involved and I know I am over simplifying it. I will not hijack this thread any longer, LOL. Thanks for the reply.

In simple terms yes, pitch is the theoretical distance a prop will move itself with one revolution. But as you said that whole prop slip factor is a HUGE factor. Then throw in the problem of some hulls tend to popoise and need a prop to hold the bow down, others ride bow high and need to lift the stern, some run stern high and dig the bow in needing more bow lift. So when you throw hull drag into the equation, on top of getting the engine into it's power band, prop slip, and so on, propping can get confusing. Some people put on trim tabs to make a boat work and run right, but this adds drag from the tabs being used to plant the bow. It's all about setup. I've gone from a 15 pitch in one style prop on a boat, to a 19 pitch with another styke prop on the same boat, with both turning the same WOT RPM.