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Author Topic:   Calculate Speed Given
The Whaler Guy posted 05-06-2001 01:59 AM ET (US)   Profile for The Whaler Guy  
First you need to know your exact gearcase ratio. Then Calculate your actual realistic full throttle RPM.
Example
5500/1.5=3666.6 Prop RPM
3666.6 X 21P (Prop Pitch)=77000.0
77000 / 1056 = 72.91 MPH
72.91 X .75 = 54.68 actual estimated MPH

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