Okay, I need help from the prop masters again....

I guess there is a correlation between prop pitch and horsepower, or is there?

If so what pitch can a pair of 430 hp motors turn?

Or is far more complicated than this?

I am trying t oget into the mid 70's and if I could turn a mega pitch prop it would be easy, but apparently that is not the case.

So what is the correlation between pitch and horsepower? Is there a general rule to follow?

Next is cleaver props, when are they approperate? What do they do differently than others?

Thanks for the education....

the more horsepower you have,the more pitch you can run on any given boat. I had a searay 20 foot boat with a 400 hp 383 and could turn a 21 pitch 4 blade prop at 5300 rpm. I now own a 26 foot boat with a 625 hp engine and can turn a 4 blade 5100 rpm. Many factors in finding right pitch, hull type, boat size/weight, rpm you want to turn your engines at, 3,4,or 5 blade prop, gear ratio in the drive,how high above sea level you boat, fresh or salt water, etc.

There is a correlation between speed and power but there really isn't one for power and pitch.

There are so many factors that pitch doesn't really tell us how fast a boat will go. There are times when we deal with a certain type of boat with a given power, then we can guesstimate a pitch. For the most part pitch doesn't determine the speed.

There are 3 factors that will determine the pitch prop you need to run;

WOT rpm- this is determined by the design of the motor and is typically where the motor makes max horsepower

Drive/transmission gear ratio- these can vary widely and have a large bearing on prop pitch.

Hull- Depending on the hull design and weight this will influence how fast a boat can go.

There are other factors such as the number of blades, drive height, customers goals and design of the prop.

The pitch that is marked on a prop can be several inches off of what the true pitch is.

To determine a starting pitch one would need to know the desired WOT rpm, drive/transmission gear ratio, and length/design/weight of the boat. With this information the proper prop pitch can be determined within a reasonable range.

Matt