Turbojet to hypersonic ramjet: Hybrid Chimera engine shows its range

Atlanta company Hermeus has its sights set on Mach 4 next year, to beat the Mach 3.3 benchmark set by the SR-71 Blackbird way back in 1976. Watch its Chimera hybrid engine nailing the switch between low-speed turbojet mode and hypersonic ramjet mode.

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https://newatlas.com/aircraft/hermeus-chimera-hypersonic-test/