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The calculation below gives you an approximation of the horsepower / kilowatts required to drive a displacement hull
Please enter the data for your yacht and click on the calculate......

Boat Displacement (lbs):


Water line length (feet):


Speed of Vessel (knots):

The Speed to Length ratio is: 0

The approximate power required is 0 horsepower or 0 kilowatts

We have used the following formulae in these calculations
Speed to Length ratio = Knots / (Water Line Length)0.5
Horsepower Required = Displacement / (10.665 / Speed to Length Ratio)3

We thank Dave Gerr for these calculations from his Propeller Handbook