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    Re: Speed and waterline length. was: Revisiting hull pressure wave
    From: Jared Sherman
    Date: 2005 Jan 27, 12:50 -0500

    Bill, I would expect your "downward pressure wave" is the same as the
    "ground effect" which gives aircraft extra apparent lift when they are about
    to land. And for that matter, when two boats under way come alongside,
    there's a point where the water between them also seems to help buffer them
    apart.
    
    In every instance you're seeing a point where the fluid (water or air)
    simply isn't being displaced but is being forced back by another object (the
    runway, the bottom, the other craft) and the flow is changing.
    
    
    

       
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