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NASA’s X-59 Has Reached Mach 1.53. Proving It Is Quiet Requires a Different Test.

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NEWJIN MEDIA / TECH & SCIENCE NASA’s X-59 Has Reached Mach 1.53. Proving It Is Quiet Requires a Different Test. NASA’s X-59 over the Mojave Desert on August 18, 2026. Flight testing checks how the aircraft behaves; acoustic validation addresses the sound reaching the ground. Credit: NASA/Jim Ross. Source · NASA editorial-use guidelines NASA’s X-59 hit Mach 1.53, but speed is only one test. How researchers will measure its sonic thump and study the response on the ground. The most revealing number in NASA’s latest X-59 flight update is not necessarily its new top speed. The experimental aircraft reached Mach 1.53 during a six-flight week in late September. But the result that could matter most to people under a future flight path is harder to fit on a cockpit display: what sound arrives at their homes, and how disruptive they find it. NASA’s Quesst mission separates those questions. It must establish that the X-59 can operate safely, characterize the acoustic signature it pro...

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