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Old 20-08-2009, 12:34   #31
S&S
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Quote:
Originally Posted by David M View Post
I don't have it backwards. The greater the metacentric height, the greater the stability. My information comes from my stability and trim class and my naval architecture class at California Maritime Academy. All of the ships in the world don't have it wrong. How I learned it is how stability and trim is calculated world wide.
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I think we're talking apples and oranges. I agree that a higher GM will make the boat stiffer (more stability) but it also tends to reduce the AVS. I'd think that for offshore work in small boats AVS is a more critical consideration than stability. So when i was talking "stability" I was talking about ultimate stability (area above the curve when GM is negative) not the height of the curve when GM is positive. After all, the original poster was talking about capsize.
Hope that clears it up.
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Old 25-08-2009, 22:09   #32
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I have been having similar misgivings about doing progressively more open water sailing in a boat not designed for the purpose. I sail a little racer/cruiser C&C 25 Mk1. The boat is so tender it is ridiculous, but obviously just slapping 1-3 hundred pounds on the keel is not the first things I should consider.

I am a big believer in working with what I have. Obviously, doing passages on this boat is not advised to begin with. If I want to continue to consider it, apart from getting tons of safety gear and other cruising equipment, I would have to be particularly patient in waiting for the best weather windows to make safe passages, however short/long they might be.

People have done crazier things, in crazier boats. More than anything, I know my tendency to "nuke it" and make a situation worse. I have stopped considering it reasonable to slap that 200lb bulb on what is a small, light racing weekending boat, all just to achieve stability. Instead, I am focusing on sailing her in bad close-to-shore weather to see how she truly responds. We'll see.

My suggestion? Sail your boat! =)
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Old 25-08-2009, 23:12   #33
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Here is a useful article to help you better understand boat stability.

Stability and Trim for Ships, Boats, Yachts and Barges – Part I
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