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Originally posted by Realist05
Point taken. The idea here is to put a rocket second stage with a idealized vacuum nozzle configuration in a position to boost the payload to orbit. From what I've read, most 1st stage separations occur under 120,000 feet at trans-sonic speeds, fanjets would be lower and slower, but reusable.
Once you talk about hypersonic or Sanger type 1st stages the costs soar higher than the vehicle because of the engineering considerations on the airframe.
There has to be another reason this won't work.