![]() ![]() This wouldn’t be terrible overhead on a larger tank, but the restriction of a 9-metric-ton rocket means these add a lot to dry mass.Īs for your calculation of an “effective ISp” with this dry mass increase, it’s probably better to look directly at the thing that changes-gross mass per unit payload (P). None of that is light, particularly the latter-a docking ring can run in the neighborhood of 100-250 kg depending on the system, and to simply dock together into a stack you need two per tank, plus propellant line connections that will either need their own system or to be connected by EVA along the length of the stack. Click to expand.As you say, individual unit tanks will need a lot of duplicated services like pumps, valves, pipes, and depending on how they get to a station may need avionics, RCS, and docking ports.
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