Re:Space-based system maybe? (Score 1)

The whole idea of spinlaunch is that you don't have to spend energy to put fuel and engines (the first stage of a rocket) into (partial) orbit. If you put the whole launch system in space you negate that advantage.

Also that counter-rotating system for balance means that you cut efficiency in half because you have to launch a counter weight in the opposite direction of the payload. So you first need to put twice the mass of the payload into orbit (payload and it's counter weight) and the same energy you put into the speed of the payload you waste on the counter weight in the opposite direction.

Then there is the problem that the launch arms are now spinning.