(David Shannon) wrote in message
2STO typically uses 1/3 the propellant for a given payload, although vehicle empty weights are higher.

I don't have a problem with 2STO for a RLV. But how do you get the
first stage back? If you have good mass ratio between the 1st and 2nd
stage, its likley to be going fast at the seperation point making it
quite hard to do.

Greg