Hello Johannes,
should it be space, mass, or both?
Say I have a cabin (1 ton, 500 cf) and life support for
three people (0.3 tons, 15 cf at TL10). Fusion power is
trivial. This cabin could hold one person, with single
occupancy and 200% redundant life support, two persons
with 50% redundant life support, or hot-bunk three with
no reserve life support.
Typical cargo is rated at 20 lbs. per cf, so 515 cf
could hold 5.15 tons.
And most of my vehicles have empty volume -- I didn't
specify if those extra corridors are in the passenger
areas or the engine rooms.
Hmm, if you take space, the same ship, with the hold filled with cabins
and lifesupport, will get more efficient (due to a lower loaded weight,
unless you have a mass independent speed)
If you go by mass, unless the gains by speed are high, you will be biased
towards not including passangers.
I think ideally you should find a factor, where for most or average
ships, converting cargo space to passenger capability will have little or
no effect of efficiency.
You propably can use that factor later, to calculate passenger ticket
prices from cargo prices, though there could be other factors as well,
such as plannability of the markets, payments morals of the customers ect.
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