Thread: Non OTU: Crew requirements
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Old October 28th, 2014, 05:02 PM
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The Ohio Class' 18750 displacement tons is 18750 * 35 = 656250 cubic feet.
35.3179 cubic feet per cubic meter gives us roughly 18581 cubic meters.
The Traveller Ton is properly a Displacement Ton, but of liquid hydrogen, not water. It's axiomatically set at a median value of 14 cubic meters. 18581/14=1327.2 Td

So an Ohio is roughly a 1328 Td ship (rounding up). Well inside the design system of MGT.

Traveller makes some interesting assumptions about crew space that are not borne out by current SSBN nor SSAN designs, but are borne out by modern cruise ship designs (if one ignores that the staterooms are typically double occupancy).

A typical USN berth for an enlisted man is about 4 cubic meters, counting the access space and locker, and his share of the head. The mess space runs about 1-2 cubic meters per man, depending upon design.

Note that, in 1920, the L-class submarines in use had "290 cubic feet of air space" per man, about half that of a typical surface ship. ① So, 580 cubic feet per man of airspace - about 1.2 Td (Traveller Displacement Tons).

Note that that 1.2Td per man for a WWI naval vessel was inclusive of the workspaces... but didn't count deck space nor ventilation machinery. (The referenced article from ① is about hygiene in subs.)

You can, and possibly should, consider different sized quartering if you're going to dink with the ship design system at all.

2Td per man, with possible provision for 1Td per man, puts you into bunking still more generous than WW II naval vessels, but noting that they lacked deck space. This space would include designated hallways, bunks (probably lining the hallways), and communal freshers.

As for stewards... The SS United States had roughly 300 stewards ② (of 900 to 1100 total crew, depending upon year) for 1928 passenger berths ③, in 645 passenger staterooms, and was a commercial cruise liner. 1 per 6.5 passengers and officers, roughly. If we count crew as 1/2 a passenger, we get 1 per 7.9 passenger-equivalents; at 1/3, 1 per 7.4. This is based upon 1966 non-automation...

Traveller's 1:8 ratio isn't far from historic marks.

① United States naval medical bulletin, Volume 14, page 8-9
② Shipboard Manpower: A Statistical Study of Men in the United States Merchant Marine
③ wikipedia
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