Re: [Paddlewise] Pro's and Con's of the "Swede Form"

-----Original Message-----
From: Matt Broze <mkayaks_at_oz.net>
To: 'Paddlewise' <paddlewise_at_lists.intelenet.net>
Date: May 29, 1999 2:47 AM
Subject: Re: [Paddlewise] Pro's and Con's of the "Swede Form"


(SNIP)

>
>An alternate explanation for trim change near hull speed I asked for in my
>last post.
>The second wave crest moves behind the stern as the boat speed increases
>(lengthening the wave) above a speed/length ratio of 1.34 wavelength^.5
>(Froude 0.4) commonly known as "hull speed". As this crest is no longer
>there supporting the stern it sinks into the (low pressure) trough now
under
>it, but the bow is still being supported by the bow wave changing the trim
>to a stern down condition.
>Higher speeds will now require overcoming the force of gravity (with
dynamic
>lift) as well as the drag due to friction and the inertia of water.
>It still sounds like one would be paddling uphill to go faster though.
>Any comments?

I guess I did not make myself clear but this is what I was trying to say
(assuming I read this correctly) with the exception of the uphill part
where I think the term, uphill, misleads by suggesting that the climb is up
and over the bow wave when the boat rises vertically and the bow wave
diminishes in size.


Cheers,
John Winters
Redwing Designs
Specialists in Human Powered Watercraft
http://home.ican.net/~735769/

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