02-22-2020, 07:03 AM | #1 |
Join Date: May 2005
Location: Oz
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Cargo capacity of a 260-ton schooner
Suppose that a schooner of 260 tonnes displacement {34 m long at the waterline and 44 m overall length, with a beam of 8.3 m and a (maximum safe) draught of 5 m} were being used to carry cargo that was unusually dense — not bullion bars, but dense enough that load was the limiting factor and tonnage was not a binding constraint.
How many tonnes (mass) could such a ship carry safely?
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02-22-2020, 12:54 PM | #3 |
Join Date: Sep 2008
Location: near London, UK
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Re: Cargo capacity of a 260-ton schooner
Do we know the unladen draught of the vessel?
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02-22-2020, 02:54 PM | #4 |
Join Date: May 2005
Location: Oz
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Re: Cargo capacity of a 260-ton schooner
It would be of great help if we did.
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02-22-2020, 03:55 PM | #5 |
Join Date: Jul 2006
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Re: Cargo capacity of a 260-ton schooner
Is that 260 tonnes fully stored or do you also need to reckon for stores?
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02-22-2020, 03:58 PM | #6 | |
Join Date: May 2005
Location: Oz
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Re: Cargo capacity of a 260-ton schooner
Quote:
Type: Schooner Displacement: 258 t (284 short tons) Length: 43.6 m (143 ft 1 in) o/a 34.1 m (111 ft 11 in) lwl Beam: 8.2 m (26 ft 11 in) Height: 38.4 m (126 ft 0 in) Draught: 4.85 m (15 ft 11 in) Propulsion: Sails Mainmast, height from deck 38.4 m (126 ft 0 in) Foremast, height from deck 31.3 m (102 ft 8 in) Sail area 930 m2 (10,000 sq ft) Mainsail area 386 m2 (4,150 sq ft) Crew: 20
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Decay is inherent in all composite things. Nod head. Get treat. Last edited by Agemegos; 02-22-2020 at 04:03 PM. |
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02-22-2020, 05:58 PM | #7 | |
Join Date: Jul 2006
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Re: Cargo capacity of a 260-ton schooner
Quote:
Might this help?: http://www.kastenmarine.com/cargo_yacht_120.htm |
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02-22-2020, 07:24 PM | #8 |
Join Date: May 2005
Location: Oz
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Re: Cargo capacity of a 260-ton schooner
A vessel's displacement of course varies with how much stuff you load the hull with: it amounts basically to the total mass supported by the buoyancy of the submerged hull. In terms of the different conditions of loading defined in that Wikipedia article, I suppose that what i want is the difference between "loaded displacement" and "normal displacement" (or maybe "light displacement, though that would involve me in having to estimate the mass of the passengers, crew, and stores.
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02-23-2020, 02:34 AM | #9 |
Join Date: Sep 2008
Location: near London, UK
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Re: Cargo capacity of a 260-ton schooner
A back-of-envelope calculation:
34m × 8m × ⅔ to allow for hull shape = 180m² area at water surface. Assuming fresh water that's 180 tonnes per metre of draught change. (In salt water it'll be more.)
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02-23-2020, 03:49 AM | #10 |
Join Date: May 2005
Location: Oz
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Re: Cargo capacity of a 260-ton schooner
Yeah, but 34 × 8 × 5 = 1360, and 258/1360 is only 0.19, which implies very aggressive raking below the water-line. In fact, it's so small that it makes me worry. Deep narrow keel?
I understand a little bit about hydrodynamics, but I know very little about boats and ships. I simply don't know what might be reasonable to suppose about the difference between such a sloop's laden and unladen draught.
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