NASA’s experimental X-59 aircraft is one step nearer to creating faster-than-sound flight quiet after the plane flew supersonic for the primary time on June 5, reaching a peak velocity of 713 miles per hour at an altitude of 43,400 ft—equal to Mach 1.1.
“Flying at supersonic speeds is a significant milestone for the X-59 group,” mentioned Cathy Bahm, mission supervisor for this system at NASA, in an announcement in late Might, earlier than the flight. “Finishing the primary mission-conditions flight is particularly significant—it’s the second the place we start validating the plane within the atmosphere it was designed for.”
The flight lasted 81 minutes and was based mostly at Edwards Air Pressure Base; NASA pilot Jim Much less flew the milestone sortie.
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“Supersonic” is a slippery time period, on condition that the velocity of sound will depend on the temperature and strain of the native environment. Mach 1 represents the native velocity of sound, above which motion is taken into account supersonic; Mach 5 marks the transition to even sooner “hypersonic” speeds. When objects journey sooner than the velocity of sound, the strain waves they produce are funneled to their rear and produce a cone; if the article is flying low sufficient for this cone to hit Earth, the result’s a loud noise referred to as a sonic increase.
These booms—in addition to an enormous price ticket—prompted the 2003 retirement of the one supersonic passenger aircraft, the Concorde, which ferried passengers beginning in 1976. The aircraft reached cruise speeds of 1,350 mph and will fly from New York Metropolis to London in lower than three hours underneath good situations.
For practically a decade, NASA has been working to engineer a aircraft that may fly sooner than the velocity of sound with out leading to disruptive sonic booms. The automobile’s lengthy nostril is designed to disperse the shock waves in order that flight produces merely a “quiet supersonic thump,” because the company described it within the late Might assertion, someplace between distant thunder and a automobile door shutting 20 ft away.
The result’s the X-59, which first flew in October 2025 and has made greater than a dozen flights so far. Now that the X-59 has gone supersonic, the check flight program continues, with deliberate speeds reaching Mach 1.6 (1,218 mph) and altitudes reaching 60,000 ft, though the aircraft will even make much less superlative flights to supply its engineers with ever extra information.
“These flights not solely deepen our confidence within the X-59’s efficiency—they mark our development towards the long run phases of the mission that can finally assist form the way forward for supersonic journey,” Bahm mentioned within the late Might assertion.
As soon as this spherical of check flights is full, NASA will start a second part of assessments that focuses on the noise the aircraft makes, figuring out whether or not it produces the deliberate “quiet supersonic thump” or one thing extra akin to the unacceptable sonic booms of different high-speed automobiles. The ultimate part will relocate these assessments over communities, with NASA surveying residents on their impressions of the airplane’s noise.
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