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Old 31-05-2011, 08:06   #31
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Join Date: Aug 2010
Location: Houston,Tx
Boat: Maxum 37'
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Re: Theoretical Boat Speed

Originally Posted by Dockhead View Post
Well, actually, it is a law -- a rigid law of physics.

The thing is, however, that the law applies in different ways to boats with different hull forms, displacement, and power available. Some displacement hull boats can exceed hull speed fairly easily; for others it's like hitting a brick wall. Most are somewhere in between.
All the law says is that it takes a relatively speaking additional amount of force to exceed this speed in a pure dispacement hull with no hydrodynamic effects other than the speed of the bow and stern waves.

Few boats actually have their hull speed exactly at the hull speed due to other factors, I.E. changes in LWL as boat approaches hull speed, (designed or incidental), lift from hull curvature, or induced turbulence, ...

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