Prop help

[Scuda11]

I realize now that should have placed this post here instead of the OMC board.<br /><br />I had heard that approx 200 rpm's = inch of pitch, is this correct?<br /><br />I have a 20' C/C Proline, 1972 (pretty heavy) and a 1983 200 hp Johnson. I am way under RPM's, around 4100, think I should be around 5000-5200.<br /><br />I am thinking a 21 Pitch, do you guys agree?

 

[Dunaruna]

Re: Prop help

You don't mention what prop you are currently running.<br /><br />Approximate - add and inch (pitch), lose 200 RPM @ WOT (subtract an inch, gain 200 @ WOT).<br /><br />Heres a couple of sites you might like:<br /><br /> prop basics <br /><br /> prop basics <br /><br />Aldo

 

[Scuda11]

Re: Prop help

Thanks a million mate! I am not sure what size I am running now. Using that site I guess I could measure it myself right? Thanks again.

 

[Dunaruna]

Re: Prop help

Your welcome,<br /><br /><br />

Originally posted by I'm_a_learning:<br />[QBUsing that site I guess I could measure it myself right? Thanks again. [/QB]

Very hard to do, good luck.<br /><br />If you don't determine what you currently have its impossible to know if you need less or more pitch. Should be stamped on the prop (ie: 15 x 19), if not, maybe a prop shop can help. They have the machine to measure pitch.<br /><br />Aldo