Pitch and diameter

[logart00]

I have a 13-3/4 x 15 prop right now that is in need of replacement. I would like more RPM, since the boat has a hard time planing when I have more than 3 people on it (which is often).

I see a 13-3/4 x 13 prop listed in the iboats.com prop selector. Am I supposed to keep the same diameter and just change the pitch to get better planing and hole shot, or should the diamter go down as well?

 

[walleyehed]

Re: Pitch and diameter

Diameter in aluminum usually goes up with a pitch decrease...some stay the same.
What RPM are you running with a load?

 

[logart00]

Re: Pitch and diameter

I am getting ready to order a tiny-tach, so I don't know for sure what the RPM is. Guess I should check that first before buying a new prop?

 

[Crownie2]

Re: Pitch and diameter

I am getting ready to order a tiny-tach, so I don't know for sure what the RPM is. Guess I should check that first before buying a new prop?

Yes - you need to know what your max RPM's are before playing around too much.

Bob