Free Boat Speed & Propeller Calculation 
Fill in data here for a FREE calculation & interpretation of results using our boat speed and propeller size calculator program that is available for all Windows PCs, XP to Win10 for £25.
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Total Laden Weight (Tonnes) *
Waterline Length (ft) *
Number of Engines *
Horsepower - per engine (HP) *
Engine Speed for above power (RPM) *
Gear Reduction Ratio (if known)
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Boat Description & Comments
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