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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.

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