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Old 11-14-2004
PhilMraz PhilMraz is offline
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What can you tell from the numbers?

You said a mouthful, Jeff. I think that was about the most concise explanation of sailboat design dynamics I have ever read. Did you put that together today, or is it an excerpt from that new text book you’re writing?

There is one issue regarding ultimate stability when beam to a wave that I have not heard discussed before. It has also to do with the dynamics of the wave motion itself. Any surfer knows that he can easily dive beneath a wave to let it pass over since the depth of the wave action is relative to wave height and rapidly declines beneath the surface. Given two boats with similar vertical centers of gravity, one having a deep draft and the other a shallower draft, would the deeper lying keel plane not induce greater roll tendency due to the differential of the fluid motion within the wave? Might this not be one scenario where deeper draft actually contributes to “tripping” the vessel?

Got to re-read that analysis once again. More questions will arise!

Regards,
Phil
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