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    Re: Wind & Current Navigation
    From: George Huxtable
    Date: 2003 Apr 18, 00:08 +0100

    In replying to a question from Dan Allen, I said-
    
    >>Is that good enough to satisfy Dan, or does he wish to get more fundamental?
    
    and he replied-
    
    >More fundamentals!  Teach us hydrophysics!
    >
    >Dan.
    
    Well, teaching hydrophysics is something I must decline with regret.
    
    1. It's not my subject. What I have explained to the list is pretty near
    the sum total of all I know about hydrodynamics. And I've cogged that
    mostly from "Sailing Theory and Practice" by C A Marchaj (Adlard Coles,
    London, 1964). I recommend that book to any searcher after wisdom about the
    interactions between boats, wind, and water. Not that it's free of faults:
    there are some significant areas of confusion. But it's the best text that
    I know of, about a big topic.
    
    2. First things first. Most important item on my agenda is the long-delayed
    scrub-off and antifouling of my boat Christina, done with her leaning
    against a wall, between tides. Poole has a very low tidal range, which is
    convenient in many respects, but not for that job. It's only at the top of
    springs that there's enough range to uncover her 4-foot draught keel. This
    weekend is that tide, and my wife and I will be spending our Easter
    grovelling about in the muck.
    
    3. I haven't forgotten (though you might not believe it) that I still owe
    the list the long-promised concluding part or parts of my saga about
    lunars. That comes first, and Dan will have to find an appropriate guru to
    teach him hydrodynamics.
    
    ====================
    
    In the same thread, Dave Weilacher asked-
    
    >You may have just sorted out a nautical saying that I have often wondered
    >about the arithmetic of.
    >
    >"Twice the wind has eight times the force"
    >
    >This is probably correct if it is "Twice the wind has eight times the power".
    >
    >Do I understand this right?
    >
    >Dave
    
    I haven't heard that expression, but put the way Dave has done, I think it
    would then be correct
    
    George.
    
    ================================================================
    contact George Huxtable by email at george---.u-net.com, by phone at
    01865 820222 (from outside UK, +44 1865 820222), or by mail at 1 Sandy
    Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK.
    ================================================================
    
    
    

       
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