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Old 02-23-2020, 05:06 AM   #11
johndallman
Night Watchman
 
Join Date: Oct 2010
Location: Cambridge, UK
Default Re: Cargo capacity of a 260-ton schooner

Quote:
Originally Posted by Agemegos View Post
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'd expect so for a schooner. That is a rig that's pretty capable at sailing against the wind, and it needs a deep keel to reduce the extent to which wind drags it sideways.
Quote:
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.
Less than a meter. If those 260 tonnes of displacement are "deep load", the maximum that's reasonably safe to carry in normal bad weather, the ship empty probably weighs half that, allow 30 tonnes for water, crew, supplies, equipment and stuff, giving you 100 tonnes for cargo. With many cargoes, the ship will be volume-limited, but not with this very dense cargo.

Displacement tonnage became an important measure in the 1920s and 1930s, for warships. It was a much more useful measure of capability for warships of the time (heavy armour, heavy guns) than it is for cargo vessels, but it looks more "scientific."

Last edited by johndallman; 02-23-2020 at 05:10 AM.
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Old 03-02-2020, 01:30 PM   #12
Mark Caliber
 
Join Date: Aug 2004
Location: Central Florida
Default Re: Cargo capacity of a 260-ton schooner

Based on what little information we have I'm guessing that the cargo capacity is well under 260 tons . . .

As a quick guess, take the 258 Ton as a VERY TOP weight (before sinking) and subtract the weight of the vessel.

There you go!

But you'll need a safety buffer, less weather . . .

But for a quick 'educated' guess, I'm guessing 50 tons (100,000 lbs)? (emphasis on the word "guess").

I can tell you how much weight a Duce and a Half Truck can carry. (Two and a half tons).

And a Half Ton Hummer can carry 1000 lbs.

Any rate most land based cargo vehicles can carry about 25% of their total Gross Vehicle Weight.

That GVW 2,000 lbs car that your driving? Don't try to carry more than 500 lbs in that! (Pax OR Cargo).

I'm feeling pretty good about that 50 tons for the ship. It's only 20% of total displacement and historically we started using boats for cargo because of how good they were at doing so.

Just don't go over that Total Displacement Number!
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