Lockheed Martin X-59 Quesst

X-59 Quesst
The X-59 on the ramp at Skunk Works
Role Experimental supersonic aircraft
National origin United States
Manufacturer Lockheed Martin
Design group Swift Engineering
Status In testing
Primary user NASA

The Lockheed Martin X-59 Quesst ("Quiet SuperSonic Technology"), sometimes styled QueSST, is an American experimental supersonic aircraft under development by Skunk Works for NASA's Low-Boom Flight Demonstrator project. Preliminary design started in February 2016, with the X-59 planned to begin flight testing in 2021. After delays, as of January 2025, it is planned to be delivered to NASA for flight testing in 2025. It is expected to cruise at Mach 1.42 (1,510 km/h; 937 mph) at an altitude of 55,000 ft (16,800 m), creating a low 75 effective perceived noise level (EPNdB) thump to evaluate supersonic transport acceptability.

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