Comment Re:could it be scaled up (Score 4, Insightful) 170
You're then pulling along a 20km hose behind your rocket, and that hose has to be strong enough to support its own weight. You're going to add more weight than you're subtracting.
Unless you built a 20km tall tower that the hose hangs down from and as the rocket ascends you retract the hose so the rocket doesn't have to carry the slack. But then you have to build a 20km tall tower that can hold an enormous amount of hose (still sturdy enough to be 20km long) and the weight of the fuel item you're moving, and since that weight is going to be on one side of the tower you'd have to counterbalance it on the other side. Tricky.