NASA’s X-59 experimental aircraft is unique – it’s designed to fly faster than the speed of sound, but without causing a loud sonic boom. To confirm the
NASA Armstrong Public Affairs SpecialistNASA recently completed a series of tests to reduce risks prior to Phase 2 of its Quesst mission, which will test the ability of the X-59 experimental aircraft to make sonic booms quieter. Credits: NASA/Steve Parcelexperimental aircraft is unique – it’s designed to fly faster than the speed of sound, but without causing a loud sonic boom.
The X-59 itself is not yet flying, so using an F-15 and an F-18 from NASA Armstrong, the CarpetDIEM III testing involved 20 supersonic passes with speeds ranging from Mach 1.15 to Mach 1.4, at altitudes ranging from 40,000 to 53,000 feet. Three of the passes involved an F-18 conducting a special inverted dive maneuver to simulate a quiet sonic boom, with one getting as quiet as 67 perceived level decibels, a measure of the perceived noisiness of the jet for an observer on the ground.
CarpetDIEM III also validated the use of Automatic Dependent Surveillance-Broadcast, an existing technology flown on all commercial aircraft and most private aircraft to report speed and position. This system triggers the ground recording systems to begin recording. “When we get to Phase 2 of the Quesst mission, we expect to be doing these recordings of sonic thumps for up to nine months,” Cliatt said. “We need to be able to have instrumentation and operations that can facilitate such a long deployment.”
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