easy prop question

[mattttt25]

quick question...<br /><br />currently run a 14.5 x 19 on my johnson 150hp. turn 5000 rpm at wot.<br /><br />if i switch to 15 x 17, i should see an increase in rpm, correct?<br /><br />thanks-

 

[Mettaree]

Re: easy prop question

Correct. Expect to see an increase of 300 to 400 RPM for the 2 inch decrease in pitch.<br /><br />Count your Blessings<br />Not your troubles<br />

 

[Dhadley]

Re: easy prop question

We would rather work with the set up first -- before reducing pitch -- to gain rpm. You stand a better chance of increasing efficiency that way.<br /><br />Good luck!

 

[ob]

Re: easy prop question

Not necessarily.RPM increase would depend on whether the two props in question were of the same manufacturer , composition , and cup design.You may have decreased the pitch using the same brand and style prop , but you didn't mention so in your post.Also the fact that the reduced pitch prop has added diameter factors in to the equation.

 

[mattttt25]

Re: easy prop question

thanks fellas, just wanted to make sure i had the theory right in my head. same prop, just different size. set-up is fine. was lent a prop and wanted to be sure what to expect before i tried it.