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Old 14-03-2013, 12:55   #46
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Re: Displacement???

Yah ... but ... sorry, what is the poll question again?
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Old 14-03-2013, 13:31   #47
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Re: Displacement???

I think the question is, did people pay attention in their high school science classes?
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Old 14-03-2013, 13:42   #48
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Re: Displacement???

Quote:
Originally Posted by nial View Post
Thanks for all the enlightening answers. I gather from them that there is no standard formula that builders adhere to when publishing the displacement weight of their boats. Thats really all I wanted to know. I kinda thought that most people would assume, since I was using a computer, that I was of normal intelligence and consequently would know all the elementary stuff, volume of water displaced=weight of displacing object, etc. Still, I did learn what I wanted to know. CF is a great resource.
Glad you got what you needed. Just to be clear, I never assume the poster of a question has any more information than is stated in the post. There are many people who use a computer who post on the forum and have not done a search for the answers to their questions. As you read through many past posts you'll see that trend too.

Good luck in your research.

kind regards,
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Old 14-03-2013, 13:46   #49
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Re: Displacement???

To be fair to the OP, he was rather specific in his question ...

Quote:
I'm puzzled about what "displacement" of a sailboat means. Is it the weight of the boat with mast, rigging, sails, fuel, water, etc. or does it exclude any or all of those items. Perhaps there is an industry standard as to what boat builders mean when they give this figure but I haven't been able to find it.
... instead, or in addition, he got schooled in Archimedes principle.

Just saying ...
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Old 15-03-2013, 16:01   #50
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Re: Displacement???

So just what does the [net 8 tons[ posted inside my 32ft. monohull mean?
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Old 15-03-2013, 16:23   #51
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Quote:
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So just what does the [net 8 tons[ posted inside my 32ft. monohull mean?
It's in reference to your USCG registered tonnage as calculated as an internal volumetric calculation that is only lightly based on tangible numbers.
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Old 15-03-2013, 17:25   #52
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Re: Displacement???

It's an unfortunate historical unintended consequence which sees "Displacement" being used to denote weight, especially in the case of recreational boats.

As others have implied, it was a kludge to provide a pure and unambiguous term for weight, in view of the hijacking of "Tonnage" (which was rather stupidly chosen as the term for a formulaic proxy for revenue-earning volume, for taxation and duty purposes. I think possibly because "tun" was an archaic term for "barrel", which was a volumetric measure, not a weight measure)

It means that we end up talking about Archimedes when it is not relevant to the question being asked.

I agree with those who say that the bare term "Displacement" is not prescriptive about the loading conditions of the boat, any more than the bare term "Weight" would be.
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