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  #4461  
Old 04-15-2014
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Re: Pros and cons of steel sailboats

Congratulations, Bob!

I like Marty's kids. They are an interesting bunch..
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  #4462  
Old 04-15-2014
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Re: Pros and cons of steel sailboats

Thanks Denda.


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  #4463  
Old 04-15-2014
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Re: Pros and cons of steel sailboats

Bob,

First congrats on the little guy! A while back you commented on obtaining stability calculations on my new boat Crusoe. I have been unable to contact the builder but maybe you can take a quick look at this informative piece I pulled up on the web on stability curves. Crusoe is 25 tonnes draws 3 meters and the keel ballast is 4.5 tonnes. Length 17 meters and the beam somewhat narrow at 4 meters. (A couple pics below). Question is where would you place the boat between the A to D per the article below.

Understanding monohull sailboat stability curves | M.B. Marsh Marine Design





Thanks as I am clueless to calculations such as this.

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  #4464  
Old 04-15-2014
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Re: Pros and cons of steel sailboats

Shank:
I can't connect to that link.
If you asked me to guess at your limit of positive stability I would guess that it is 123 degrees. That's a fine number. By the way, I am really good at guessing these numbers.

I'll see if I can connect to that link again.
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  #4465  
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Re: Pros and cons of steel sailboats

Bob, Here it is again

Understanding monohull sailboat stability curves | M.B. Marsh Marine Design
  #4466  
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Re: Pros and cons of steel sailboats

Shank:
That is a pretty generic article. It even refers to itself that way. Your CB boat doesn't fit any of those types. I'd stick with my guesstimate until you can get in touch with your designer. He really owes you that data. As a designer I have to provide technical backup up for my owners. I do it all the time. It's often a PITA but who else can they go to?
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  #4467  
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Re: Pros and cons of steel sailboats

Bob, If you are able to pull up the article what was really interesting to me was the reply from Andrew Troup because Crusoe was designed to explore in Antarctic waters. The flat bottom portion of the hull was 25 mm. steel plate and with the keel up the idea was be able to sit on ice. Not my ideal use of ice but very interesting indeed.

  #4468  
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Re: Pros and cons of steel sailboats

Shank:
That's 1" steel plate!
The biggest effect that would for your use is that it would put a lot of weight low to help your VCG.

I'll go back to the link and see if I can find that reply.

Ok I read that reply. Not sure I agree with all of it. But I agree and have for some time warned people of being too confident of static stability studies. They just don't have much in common with the real world conditions in which the boat would be subject to being rolled over.

As for pulling the CB up in survival conditions I have no experience with that so I can't comment. I understand the principle though and it sounds plausible. In your case raising the CB would not have the adverse affect, talked about in the link, of raising your VCG. That's a big plus for you. I don't know who this guy is but I did not read anything there I thought was "wrong". I like his dynamic approach to stability. On the face of it your boat has the best of both worlds.
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Last edited by bobperry; 04-15-2014 at 02:22 PM.
  #4469  
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Re: Pros and cons of steel sailboats

Thanks Bob, Coming from you that means something. I am a very cautious sailor and with my wife and sons on board limiting any room for error is the deal.
  #4470  
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Re: Pros and cons of steel sailboats

You are welcome Shank. It's only my opinion but I have been thinking about these things really hard for a long time.
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