Weird Harold wrote:Actually, as a peace-time use for SD(P)s, Skimpy has a viable idea...
It's theoretically possible, yes. My reasoning why it's a bad idea, though, was twofold.
First, you don't really *want* a peacetime use for SD(P)s. Any SD(P) that's hauling cargo might as well not exist from a military perspective, for however long it takes to get it recalled and rearmed. Part of the point of having a bunch of SD(P)s around is that you can maintain things like Home Fleets and other standing forces - not in the *expectation* that you will be imminently attacked, but because it's your responsibility to allow for the *possibility* of attack, or at least force any hypothetical attacker to be able to overcome your fleets. SD(P)s that are off cargo-carrying can't do this.
And second are those practical problems I mentioned. (This also feeds back into the first in some ways.) Mostly, this is the fact that SD(P)s will make lousy cargo vessels.
Certainly a pod design is the only type of warship that could do any cargo-carrying at all, but that doesn't mean they're actually going to be very good at it. Having to package everything in the pod-handling paradigm is going to cut down on how much cargo you can actually transport for a given cubage compared to a freighter, for one, and the SD(P) is additionally going to have a far lower fraction of its internal volume devoted to cargo than the freighter will. (And every regular missile pod you retain for defense just lowers that fraction further, on top of complicating your cargo-handling procedures since those pods would have to be the outermost ones.)
Additionally, the operating costs of an SD(P) are far, far higher than a freighter. For starters, the crew size (whether absolute, or for a given cubage of cargo) is far higher, even with manty automation, and every one of those crew is drawing a paycheck. The operating costs of all the military-grade hardware is also going to be far higher, again both on an absolute and a per-cargo-cubage basis. Ultimately, moving a given amount of cargo somewhere using SD(P)s is probably one of the least efficient possible modes of transport available.
When you put those two sets of practical concerns together, even *if* you had enough SD(P)s to be able to maintain your fleets and still have leftovers for cargo duty, you're probably better off just mothballing the extras instead and using the saved monetary and personnel resources to move that cargo in traditional freighters under escort. You'll probably spend less money and consume less personnel resources per cargo cubage that way, and depending on how extensive your trade routes are you might even be able to reactivate the mothballed ships faster than you could recall the cargo-carrying ones!
Ultimately I'm not saying this is impossible, just that it's massively impractical and not a good idea.