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From: Robert Gainer (no email)
Date: Wed Jun 23 2004 - 18:50:07 EDT
I think the wind driven wave breaks because the slope of the face no longer
supports the height and the peak simply falls over. The other breaking wave
is when the sea bottom is felt by the wave (I think that’s at ½ the wave
length) and it climbs in height and reduces in wavelength. Oil will not
change either of those conditions. You say drogue as if it’s different then
a small sea anchor. How do you describe a drogue? I have used the words
“heave to” and “lying a hull” interchangeably. I just looked them up and
found that they are in fact too different things. I really have to be
careful about what I type. I have used the technique of heaving to with
success; I don’t like to lay with no sail at all because it’s two
uncomfortable.
Bob
>From: Bryan Genez <>
>Reply-To:
>To: <>
>Subject: Re: [world-cruising] Sea anchors
>Date: Wed, 23 Jun 2004 17:48:48 -0400
>
>Robert Gainer wrote:
>
> > Do you see any advantage to the sea anchor instead of laying a hull or
> > running? The old fashioned sea anchor with the oil reservoir and much
> > smaller size may have made some sense. Oil to windward has a very
>calming
> > effect on the waves.
>
>I think studies have shown that oil reduces spray; the surface tension of
>the oil tends to be more resistant to the wind than is water. So the wave
>faces and tops are smoothed out. Their height, though, shouldn't be
>affected. I doubt that oil would stop a wave from breaking, but maybe....
>
>Sea anchors are just another tool. Probably most effective when the option
>of going to windward is not desirable. When they work, they will keep a
>boat "anchored" in the same area. In the pre-EPIRB days, a sea anchor
>often
>meant you were found more quickly, as searchers didn't have to calculate
>boat drift. Now that we all carry EPIRBs <grin>, that's less important.
>
>I don't have a sea anchor, and probably won't buy one. I do carry a
>drogue;
>I think my boat will behave nicely under drogue if required. And I will
>heave to should that be a better option. I'm not confident that lying
>ahull
>is a good idea.
>
>Mostly, though, I hope to be able to avoid serious weather. With today's
>forecast and communications systems, that should be possible...most of the
>time!
>
>--
>Best,
>
>Bryan Genez (KB3HMZ)
>"Capella" Valiant 40 #158
>Annapolis, MD
>
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