$500 million Air-Breathing Stage Seen Possible
Credit: NASA/JIM ROSS
A reusable air-breathing space-launch first stage growing out of the successful X-43A Hyper-X test flight in March could be ready to send 20,000-lb. payloads to low-Earth orbit (LEO) by about 2015, say the engineers who developed the Mach 7 testbed. Holding an operational first stage to that speed...
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