02-21-2015, 07:26 AM | #11 |
Join Date: Sep 2007
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Re: How dense are boats?
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02-21-2015, 12:46 PM | #12 |
Night Watchman
Join Date: Oct 2010
Location: Cambridge, UK
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Re: How dense are boats?
The warship rules are based on displacement, which means actual weight, because that was a better measure of fighting power than volume. Still not a perfect measure, but better. The politics in that largely stemmed from different nations having very different requirements for range, and thus fuel capacity.
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02-22-2015, 05:14 AM | #13 | ||
Join Date: Aug 2004
Location: Wellington, NZ
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Re: How dense are boats?
Quote:
As for density, aside from oddities like the Monitor the most dense surface ships were the late 19th century battleships, with their minimal superstructures and low freeboards. They had densities higher than 0.5 (i.e. over half their volume was below their waterline). Next would be 20th century dreadnoughts, which by WWII tended to about 0.5. Aircraft carriers were (and are) much less dense. Compare the carrier,USS Hancock, with the battleship, USS New Jersey in these two photos: http://www.bb62museum.org/images/g291047.jpg https://s-media-cache-ak0.pinimg.com...8446a7906b.jpg Hancock was an Essex-class carrier, of about 35,000 tons, while New Jersey was an Iowa-class battleship of about 55,000 tons. Their length and beam were similar, but the battleship obviously had a deeper draught. But the striking thing is that the carrier clearly would tower over the battleship were they side by side. As an aside, the battleship developed 40% more power to drive almost 60% more mass the same speed - larger ships tend to require less power per ton for the same speed, especially if they grow deeper rather than simply bigger all over. Quote:
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Rupert Boleyn "A pessimist is an optimist with a sense of history." Last edited by Rupert; 02-22-2015 at 05:37 AM. |
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02-22-2015, 04:43 PM | #14 |
Join Date: May 2009
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Re: How dense are boats?
Try reading this: http://en.wikipedia.org/wiki/Builder...ld_Measurement
I happened to be curious about how they rated old sailing ships recently. That is the formula the Royal Navy used to use to estimate the carrying capacity of wooden sailing vessels. It normally seems to work out that tonnage is about 2/3 displacement. |
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