Re: [Paddlewise] Hull speed isn't wave climbing climbing

From: Michael Daly <michaeldaly_at_home.com>
Date: Mon, 14 May 2001 20:49:18 -0400
From: "Stephen King" <steveking2000_at_home.com>


> The theoretical speed of a vessel in knots through water can be
> generally calculated as 1.34 x SqRt of the length of the water line. 
> [...]
> the vessel is, in effect, constantly going up hill. 

If you speed up, the bow wave goes faster.  If you slow down, the bow
wave slows down.  How do you climb a wave that you are making?

If climbing a wave was the cause of the resistance, the force increase
would be proportional to the slope.  However, the slope doesn't increase
at the rate which the force increases.  

Hence, it's highly unlikely that the resistance can reasonably be said to 
come from climbing your bow wave.  You can't (first paragraph) and 
you aren't (second paragraph) in spite of the claims of so many.

The reason the the force increases is that you're pushing a lot of water 
around.  (how that for scientific :-)

Mike


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Received on Mon May 14 2001 - 18:54:24 PDT

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