X-59 QueSST

X-59 QueSST. The X-59 QueSST is an experimental, piloted supersonic aircraft designed to fly faster than the speed of sound while generating a significantly reduced sonic boom, perceived on the ground as a quiet "thump." Developed by NASA in partnership with Lockheed Martin under the Low-Boom Flight Demonstrator project, its primary mission is to gather community response data to support new noise-based regulations for overland supersonic flight. The aircraft is a cornerstone of NASA's Quesst mission, aiming to open the door to a new generation of commercial supersonic travel over populated areas.

Development and design

The development of the X-59 QueSST was initiated by NASA's Aeronautics Research Mission Directorate to address the long-standing prohibition on civil supersonic flight over land, primarily due to noise concerns from disruptive sonic booms. The project, formally known as the Low-Boom Flight Demonstrator, awarded the prime contract to Lockheed Martin's famed Skunk Works division in 2016. The design process heavily relied on decades of prior research, including data from the Shaped Sonic Boom Demonstration program and wind tunnel testing at facilities like the NASA Ames Research Center. The aircraft's distinctive, elongated airframe, with its extremely long and slender nose accounting for nearly a third of its length, is a direct result of computational fluid dynamics aimed at shaping shockwaves. Key design partners included General Electric Aviation, which provided the F414-GE-100 engine, a derivative of the powerplant used on the Boeing F/A-18E/F Super Hornet.

Flight testing and research

Following its rollout at the Lockheed Martin Skunk Works facility in Palmdale, California in 2022, the X-59 QueSST commenced an extensive ground and flight test campaign. Initial phases, conducted at Edwards Air Force Base and managed by NASA's Armstrong Flight Research Center, focused on integrated systems testing, taxi trials, and envelope expansion flights at subsonic speeds. The primary research phase will involve the aircraft flying supersonically over selected U.S. communities, beginning with a series of calibration flights above the Mojave Desert and NASA Wallops Flight Facility. These community overflights, a critical part of the Quesst mission, are designed to collect quantifiable public response data to the low-intensity sonic thumps, which will be delivered to regulators like the Federal Aviation Administration and the International Civil Aviation Organization.

Technology and quiet supersonic features

The X-59 QueSST incorporates several advanced technologies to achieve its quiet supersonic signature. Its most prominent feature is the uniquely shaped airframe, engineered to prevent the coalescence of shockwaves from the nose, cockpit, inlets, and wings into the disruptive N-wave pattern of a traditional sonic boom. Instead, the design spreads and weakens these shockwaves, resulting in a softer, more gradual pressure rise heard on the ground. The aircraft's canard foreplanes and the placement of its single engine, mounted above the wing and without an afterburner, further contribute to this controlled shock propagation. The cockpit utilizes the eXternal Vision System, a suite of high-resolution cameras and displays, because the elongated nose structure completely obstructs forward visibility for the pilot.

Program goals and NASA collaboration

The overarching goal of the X-59 QueSST program, a key element of NASA's broader Quesst mission, is to provide regulators with a scientifically validated noise database to inform new sound-based rules for supersonic flight. This collaboration extends beyond Lockheed Martin to include agencies like the Federal Aviation Administration and international bodies such as the International Civil Aviation Organization. Success could potentially revise decades-old regulations stemming from the era of the Concorde and the Supersonic Transport program, enabling new markets for aircraft manufacturers. The program aims to demonstrate that quiet supersonic technology is viable, paving the way for future commercial ventures by companies like Boom Technology and reducing flight times significantly across continents.

Specifications (technical data)

* **Crew:** 1 * **Length:** 99.7 ft (30.4 m) * **Wingspan:** 29.5 ft (9.0 m) * **Height:** 14 ft (4.3 m) * **Empty weight:** Approximately 32,300 lb (14,650 kg) * **Powerplant:** 1 × General Electric F414-GE-100 turbofan, 22,000 lbf (98 kN) thrust * **Maximum speed:** Mach 1.4 (925 mph, 1,488 km/h) at 55,000 ft (16,800 m) * **Cruise speed:** Mach 1.42 (940 mph, 1,512 km/h) * **Range:** 1,500 mi (2,400 km) * **Service ceiling:** 55,000 ft (16,800 m)

Category:Experimental aircraft Category:Supersonic aircraft Category:NASA aircraft Category:Lockheed Martin aircraft Category:United States experimental aircraft 2020–2029