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AviationNASA X-59: Quiet Supersonic Flight
Twenty flashcards on NASA's X-59, the experimental jet that flies faster than sound while making a quiet thump instead of a boom.
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20 cards
- What is the X-59 built to prove?
- That supersonic flight can turn a loud sonic boom into a barely audible sonic thump on the ground.
- Why does a quieter boom matter?
- For 50 years the U.S. and other nations have banned commercial supersonic flight over land because of loud booms.
- When and where was the X-59 unveiled?
- On January 12, 2024, at Lockheed Martin Skunk Works in Palmdale, California.
- How big is the X-59?
- 99.7 feet long and 29.5 feet wide, flown by a single pilot with a single jet engine.
- What is the X-59's design research speed?
- Mach 1.4, or 925 mph, at 55,000 feet.
- What does the long nose do?
- The thin, tapered nose, almost a third of the length, breaks up the shock waves that would form a boom.
- How does the pilot see ahead without a front window?
- With the eXternal Vision System: high-resolution cameras feeding a 4K monitor in the cockpit.
- Why is the engine on top?
- With a smooth underside, it helps keep shock waves from merging behind the aircraft into a boom.
- Is the X-59 a prototype airliner?
- No: it is an experimental aircraft only and will never carry passengers.
- When did the X-59 first fly?
- On October 28, 2025: takeoff at 11:14 a.m. EDT, 67 minutes in the air.
- How was the first flight flown?
- Below the speed of sound at 230 mph, up to about 12,000 feet, with the landing gear down the whole time.
- Who flew it, and from where to where?
- NASA test pilot Nils Larson, from Air Force Plant 42 in Palmdale to NASA Armstrong in Edwards, California.
- What makes the X-59 special among NASA X-planes?
- It is the first major piloted X-plane NASA has built and flown in over 20 years.
- When did the X-59 first go supersonic?
- On June 5, 2026: pilot Jim 'Clue' Less reached about Mach 1.1 (713 mph) at 43,400 feet.
- How busy was the test pace before that flight?
- 16 flights in the previous 90 days.
- Why could nobody hear the X-59's thump on those early flights?
- The NASA F-15 chase plane flying nearby made loud booms that covered any sound from the X-59.
- When did the X-59 first reach its mission conditions?
- On June 12, 2026: Mach 1.4 at 55,000 feet, shown as 55,030 feet on its vision system.
- How will the F-15 measure the X-59's shock waves?
- With a shock-sensing probe mounted on the F-15.
- What phase comes after envelope expansion?
- Acoustic validation: measuring the supersonic acoustic signature to confirm the quiet thump.
- What will NASA do with the X-59 after testing?
- Fly it over U.S. communities, gather ground measurements and residents' surveys, and support new noise standards for supersonic flight over land.
Official sources
NASA Armstrong Flight Research Center
NASA's X-59 Completes First Flight, Prepares for More Flight Testing
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