chudsosoft
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The first stage, the big lifter plane, you say it reaches Mach 11. Does it use (sc)RAM-jets? If so, what propulsion does it use to take off?
If it uses gas turbines for the first part of the flight, lower speeds/altitudes, it would need some sort of complex double propulsion system, gas turbines combined with RAM jets (with no moving parts) for the higher speeds.
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The SR-71 did this over 40 years ago. Its engines basically operated on continuous afterburner. The faster it went, more and more air bypassed the compressor and went straight into the afterburner until it was generating over 75% of its thrust from ramjet action. Studies suggest that speeds of at least mach 6 are possible using the same technology.