SquareDisc City wrote:A craft designed specifically for brown-space operations can get by with no FTL drive, or a more limited one, and doesn't require the same kind of fuel storage capabilities.
I think this is kind of where the analogy breaks down, since any combat vessel restricted to sublight maneuvering or short-range FTL only is going to be so vastly outmaneuvered by forces with interstellar-class FTL drives that their utility as garrion forces (which is pretty much the only uses I can think of for creating a class of vessels with limited FTL drives and fuel capacities). If you can jump, say, like the nuBSG ships, on a tactical level, your 'brown space navy' will be spending most of its time in combat trying to deal with a foe that can cross the solar system in seconds, while it is restricted to speeds that are, by definition, fractions of what it's enemies are capable of, or risks depleting its comparatively-small fuel tanks while combat maneuvering and becoming a sitting duck for its more resilient enemies to pick off at will.
Not to mention that, from a safety standpoint, any given spaceship should be able to operate for extended periods of time without support anyways, since space is very big, and rescue operations can take a while to get to you. For example, say you're a 'black space' ship and your engines/FTL drive conks out in the Oort Cloud of an inhabited star system. You can talk via your FTL communications network to friendlies stationed in the system, but if they don't have FTL drives and there aren't any 'black space' vessels nearby to help, your crew could be waiting a rather long time for the system's relativistic craft to get to you.



