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Sep 20, 2018 at 21:14 comment added Uwe The payload of fuel needs a tank to hold it, therefore more than 18 refueling rockets are needed. A docking adapter is needed too as well as pumps and hoses for fuel transfer. All rockets should be at the same place within a short time interval for fuel transfer, all rockets should be launched within a short time from multiple launch pads. An additional stage for the rocket needs no precise rendezvous and no fuel transfer. Only all lower stages have to be much bigger to carry the additional stage. The whole rocket would be gigantic in size.
Sep 20, 2018 at 10:39 history edited SF. CC BY-SA 4.0
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Sep 20, 2018 at 9:13 history answered SF. CC BY-SA 4.0