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Posting a reply to: Re: Stainless prop for Emag with 60hp Yammy

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Makintrax73

Posted 9/17/2012 4:44 PM (#585286 - in reply to #585084)
Subject: Re: Stainless prop for Emag with 60hp Yammy

Posts: 156

My suggestion would be to take it VERY easy with pitch changes on a 60HP 4 stroke. I was told by numerous folk that it should be 200 rpm change per inch of pitch - including prop manufacturers.

My experience with 2 different 50hp 4stk motors - inch of pitch is worth about 400rpm change, NOT 200rpm as so often quoted. My theory is that the changes are bigger (as a percentage) with smaller motors because we are frequently working with 12, 13, 14 pitch props, as opposed to the 19, 20, etc. pitch props often used on larger motors. IE one inch of pitch is bigger percentage change going from say 13 to 14, than it is going from 19 to 20. Also suspect smaller motors are more sensitive to changes due to lower torque, etc.

If it were me I would think about adding one inch of pitch. I've had good luck with Solas aluminum props.