slip
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Join Date: Oct 2000
Location: Simpsonville, SC 29680
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![Post](/forums/images/icons/icon1.gif)
If you don't have the above site handy. This is the formula:
rpm x pitch
------------------= speed (no slip)
1056 x gear ratio
speed (no slip) - actual speed divided by speed (no slip) then press % button on calculator.
My boat 5500 r's, 26 pitch, 1.36 drive, GPS speed = 89.7 mph.
5500 x 26
----------------= 99.57
1056 x 1.36
99.57 - 89.7 = 9.87 divided by 99.57 = 9.91%
rpm x pitch
------------------= speed (no slip)
1056 x gear ratio
speed (no slip) - actual speed divided by speed (no slip) then press % button on calculator.
My boat 5500 r's, 26 pitch, 1.36 drive, GPS speed = 89.7 mph.
5500 x 26
----------------= 99.57
1056 x 1.36
99.57 - 89.7 = 9.87 divided by 99.57 = 9.91%