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        Power Required Calculator, Displacement Hull


        Desired Speed

        Desired speed is populated from the hull speed or Gerr DL Ratio forms. This is the maximum speed you require and should be less than the calculated hull speed. For a displacement hull it is pointless to try go beyond hull speed. SeeSL Ratio for more information on how hull speed is derived.

        Power Required Results

        The results show the estimated required power at the shaft. Note that engines are rated differently for inboard diesels. For example SHP is approximately 95% of BHP due to losses in the transmission, to ancillaries etc.

        Power Required Chart

        This shows the SHP required for a % of hull speed.