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

I'm not sure I'm right but what you said below agrees with my perception. At
least if you mean that the rotation at the crest would be opposite the
direction of {flow}travel. Had me confused when I thought you meant hull
travel.
-----Original Message-----
From: John Winters <735769_at_ican.net>
To: 'Paddlewise' <>
Date: Saturday, May 29, 1999 5:21 PM
Subject: Re: [Paddlewise] Pro's and Con's of the "Swede Form"


>
>As I think about it this something comes to mind. The waves created travel
>in the same direction as the hull. That means that the rotation at the
>crest would be opposite the direction of travel. We know that the flow
>along the hull travels from front to back from our flow experiments. But,
>suppose the flow in the waves at the crest acts to retard the flow along
>the hull thus increasing the potential energy and then in the troughs tends
>to augment the flow because the trough motion acts in the same direction as
>the hull flow. This satisfies the flow regime (faster in the troughs where
>pressure decreases) slower in the crests (where pressure increases) even
>though the flow in  the waves acts a distance from the hull and it also
>satisfies the flow in the created waves.
>
>An interesting thing about this comes to mind in that Leo Lazauskas (author
>of the CFD program Michlet) says you cannot rely upon wave size predictions
>close to the hull and perhaps this helps to explain why. Couple these
>opposing flows with turbulent flow aft etc and you might get a real mess.
>
>I think you have hit on something, Matt, that I had not thought of before.
>
>Who says these things aren't productive. Glad you stuck to your guns on
>this one, Matt.
>
>Cheers,
>John Winters
>Redwing Designs
>Specialists in Human Powered Watercraft
>http://home.ican.net/~735769/
>
>
>
>
>
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