Just eyeballing it, carrack has roughly half the volume of BMM, if we exclude the wings. And even though it's not any sort of freight ship, it still has 0.5k SCU. Now Carrack has the same issue as Caterpillar, the cargo bays sacrifice a lot of space for modularity. Caterpillar could hold like 250 or so more SCU if you got rid of the sectioning, those walls in between with two doors are just ridiculously thick. If you then also got rid of the internal walkways, you'd be approaching 1kSCU territory. I'm not quite sure where you got that extra 700 SCU capacity for the caterpillar for though, surely you're not thinking of sacrificing the engines?No one doubts that it has the volume for it. The problem is interior space and how SC uses them. By your calculation, the Caterpillar could hold about 1.7k SCU, but we all know SC didn't do that to the Caterpillar. Half the wings and nose can't be used, we have hallways, flight deck, crew quarters, and the ship exterior walls have a lot of thickness.
The Hull series can have a lot more SCU because it's exterior.
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Just take a look at the Carrack, that thing has almost the same volume as the BMM (wings & nose don't count). And CIG only found .5k SCU for it. The interior space is a lot smaller than the volume of the ship.
Likewise, Carrack could, if it was specifically designed to do so, hold a whole lot of more cargo. Like, get rid of that hangar, medical bay, drones, the modularity, you could get a few thousand SCU to fit in. But then again, it's not a freight ship, it's an exploration ship. So instead of cargo space, it has all these other amenities.
Yes, and these things indeed are what cost Caterpillar a good chunk of it's cargo capacity. However, while your ship gets bigger, your crew doesn't, so those hallways and crew quarters take proportionally a whole lot less space on BMM than they do on Caterpillar. Same goes for the wall thickness, twice as big ship doesn't necessarily sacrifice similar proportion of it's space to walls. Besides, some concept pictures have part of the cargo outside:we have hallways, flight deck, crew quarters, and the ship exterior walls have a lot of thickness.
In this picture, for example, we have 72 of the large 16 SCU containers visible. That's already 1152 SCU right there. Now, there is like 5-6 times that amount of space inside the ship, that's excluding the nose and wings, though most it will be taken by other stuff. Still, easily space for internal cargo bay to hold additional 2350 SCU or so.
Of course, that's just an old artistic rendition, but if anything, it's gotten bigger.
Anyhow, the point is, if they're saying it's 3500 SCU, there's really no reason to doubt it at this time. For a dedicated trading vessel of that size, it's perfectly reasonable. And yes, 3500 SCU is a lot, but it's not like it'd be out of the line when you compare it to other heavy freighters.
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