A SCRAMJet is a type of ramjet engine in which the mixing and combustion of air within the engine is taking place at supersonic speed. A vehicle using SCRAMJet technology would have an approximate operating range of Mach 4 to Mach 15. Supplementary methods of propulsion would be necessary to initially accelerate the vehicle to Mach 4 and to accelerate such a vehicle into orbit (about Mach 26).
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