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Maximum Speed of a Single-Hull
Displacement Boat 

Hull Speed = 1.34 * (LWL)1/2
LWL: length of the hull at the waterline.

   
Enter Hull Length in Feet at the Waterline (LWL): 
  

  

  Reference:  Rousmaniere, J,  The Annapolis Book of Seamanship  Simon & Schuster, New York, New York,  Chapter 1:  The boat p26-35, 1999.

Note:  The same formula has been used to calculate wave speed   
where the wave length is entered instead of the boat's LWL.  ( Ref:  U.S. Boats )

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