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engines can function from zero speed and typically perform best up to Mach 2.2. Ramjets, which rely on aerodynamic compression with subsonic combustion, perform poorly below Mach 0.5, are most efficient around Mach 3, and can operate up to about Mach 6. Scramjets can cover the high-supersonic-to-hypersonic range. The SR-72 was to employ a turbine-based combined cycle (TBCC) system, with a turbine engine for low speeds and a scramjet for high speeds. The engines

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