Prop reco?

[mboy]

21' Sea Boss/ Sea pro w/ JOhnson 175v6.

bEEN TOLD OPTIMUM PROP (FROM PEOPLE WHO OWN SAME/SIMILAR MODEL) s a 19 pitch.

I got 5100 rpm @ 39mpg WOT past summer with existing 15 x 17 aluminum ( i know others with 150 JOhnson on same boat, same light load hitting 45-50ish MPH.

Raised engine after boat was pulled end of season 1 hole up (hole 2 to 3 out of 4)

I know my rpm is about 500 below optimum. Want to go new stainless.

What is best bang for buck prop. Looking for best fuel economy and midrange performance.

Thinking of going 14ish dia. with 17P. Any performance/economy improvement with 4 blade over 3?


Thanks.

 

[Dhadley]

Re: Prop reco?

What year Johnson?

 

[mboy]

Re: Prop reco?

2003 2 stroke looper.

Theoretically, I should be dropping down to a 17p to get my rpms up a bit, but I think raising engine one hole and dropping diameter 1/2" and going SS vs dinged up aluminum should get me to 5500 rpm (roughly).