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SR-71 successor? Quarterhorse Mk 2.1 prototype cracks the sound barrier

05-29-2026 • https://newatlas.com, By David Szondy

The venerable Cold War SR-71 Blackbird may be looking nervously at its laurels after Hermeus's latest Quarterhorse Mk 2.1 uncrewed prototype broke the sound barrier at Spaceport America over the White Sands Missile Range airspace in New Mexico in Mar

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SR-71 successor? Quarterhorse Mk 2.1 prototype cracks the sound barrier

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