Prop size

[Sullygee]

Got 88 Jhonson 110 with 13.1/4 15"P on 86 16' starecraft 16' bow rider. Change prop to 12 3/4" 23P. Good/bad idea?

 

[JimS123]

Without rpm data it's just a guess.

But for sure, if the 23P works, the 15 pitch must be Reallllllly BAD.

Most prop changes are 1 or 2 inch pitch changes. Going up 8 inches sounds like a disaster.

 

[Sullygee]

Thanks that's why I ask. Will go maybe with 17. The last time our had it about 3400 rpm but not wot.

 

[Chris1956]

You really need to run the boat at WOT. If the RPMs exceed 5500, then prop pitch needs to go up. Figure on 400RPM drop for every 2" of pitch added to prop pitch.

 

[JimS123]

Why change at all? What's wrong with your current prop?

Provide more details and we can better advise.

 

[Sullygee]

You really need to run the boat at WOT. If the RPMs exceed 5500, then prop pitch needs to go up. Figure on 400RPM drop for every 2" of pitch added to prop pitch.

You really need to run the boat at WOT. If the RPMs exceed 5500, then prop pitch needs to go up. Figure on 400RPM drop for every 2" of pitch added to prop pitch.

 

[Sullygee]

Will try that next time out. Or will stay what I have as JimS said. I'm trying to understand props will get back with better info. Thanks again

 

[Chris1956]

One more thing. Run boat at WOT with normal load and max trim and then record max RPM.