The X-59 QueSST experimental aircraft took to the skies for the first time.
The X-59 takes to the skies for the first time.
Over the past several years, NASA and Lockheed Martin have been developing, building, and preparing the X-59 QueSST experimental aircraft for testing. Its design incorporates several innovative ideas and solutions aimed at reducing noise during supersonic flight. All preliminary work has now been completed and test flights have begun.
First results
The QueSST (Quiet Supersonic Technology) research program was launched about 10 years ago by NASA. Over the course of several years, various scientific studies were conducted, and new technologies and components were developed.
In 2016, NASA and Lockheed Martin signed a contract to develop and build a fully functional experimental aircraft based on new technologies. The future aircraft, designated X-59, was planned for construction and testing during the first half of the 2020s.
The design was completed by the end of 2018, after which production of the first components for the prototype aircraft began. Assembly of the aircraft itself began in mid-2019 at Plant No. 42 in Palmdale, California. This process was completed in the early 2020s, after which some ground testing and inspections were conducted.
In January 2024, the official presentation of the experimental X-59 took place at the same plant. Representatives of the development organizations spoke extensively about the importance of this project and its prospects. They also promised to begin flight tests soon, during which all the key advantages of this unusual design would be demonstrated.
A plane in flight. Photo Flickr / Matt Hartman
It's worth noting that the construction of the prototype aircraft occurred during a specific period, and the work schedule had to be adjusted several times. Initially, the first flight was planned for 2020. It was subsequently gradually pushed back to 2025-26. The estimated completion dates for the program and the achievement of actual results were similarly postponed.
The plane is in the air
Since its unveiling, the X-59 has remained at the Palmdale facility undergoing various procedures and processes. Necessary checks of individual systems and the aircraft as a whole were performed. All these activities have now been completed, allowing the aircraft to be cleared for full flight testing.
On July 10, 2025, the prototype aircraft took off on its own for the first time. Taxiing and high-speed runs along the runway began. The aircraft demonstrated normal performance at various speeds during acceleration and braking.
The maiden flight of the experimental X-59 took place on October 28. Under the control of a test pilot, the aircraft took off from the factory airfield and traveled to the Armstrong Flight Research Center at Edwards Air Force Base. NASA reported that the flight took place at altitudes no higher than 3000-3500 meters and at speeds of up to 380-400 km/h. The aircraft performed some simple maneuvers.
The purpose of the maiden flight was to demonstrate the overall capabilities and reliability of the design. The aircraft completed a simple flight program and demonstrated the required level of performance, safety, and other attributes. The developers praised this flight, but they expect further development to achieve new results.
X-59 at the assembly station. Photo by NASA.
In three steps
NASA and Lockheed Martin previously revealed a rough plan for future flight tests. These activities will last several years and be divided into three main phases. Each phase will address specific challenges, ranging from simple to complex. During each flight, data will be collected to refine the design, control algorithms, and more.
The first stage is necessary for a general check of the aircraft and its systems. The aircraft will be tested in various flight modes across virtually all expected altitude and speed ranges. Once these tests are successfully completed, the program's main experiments can begin.
The second phase of the QueSST project involves reaching supersonic flight speeds and assessing the aircraft's noise emissions. Various measurements and studies will be conducted to demonstrate the true potential of the project's key solutions. It is expected that field testing will confirm the previously drawn conclusions and eliminate the need for significant design revisions.
In the long term, a third phase, designated "community response assessment," will take place. The experimental X-59 will fly over various parts of the United States. During this time, testers and volunteers on the ground will evaluate the noise it produces.
The results of all flight tests, which will take several years, will yield a large volume of various data. First and foremost, this will be information on the performance and effectiveness of the QueSST project's key technical solutions. The results of acoustic studies, including subjective assessments by ground observers, will also be of great importance.
In preparation for ground testing. Photo: NASA
It is expected that the developments and practical results of the QueSST program will be able to find application in the future in the creation of a promising aviation technology. They will be especially useful for civil aviation developers. These new solutions will help them overcome one of the main problems associated with this type of technology—the shock wave, which causes inconvenience on the ground.
Key decisions
The X-59 project is based on several ideas aimed at reducing noise during supersonic flight. This effect is achieved through a special airframe shape and optimized aerodynamics. Wind tunnel tests have already demonstrated the potential of these solutions, and now they will be confirmed using a full-size aircraft.
It's worth remembering that during supersonic flight, so-called shock waves—areas of increased pressure that form in front of the nose, in front of the wing or vertical stabilizer, and behind the aircraft—form a shock wave. This shock wave is felt on the ground as a loud bang that follows the aircraft throughout its supersonic flight.
The X-59 design features streamlined airframe exterior contours with a minimum number of protruding parts. This reduces the number of disturbances and shock waves.
The aircraft also features a distinctive long, pointed nose cone. This reduces the nose shock wave and moves it forward, away from other structural elements that also generate shock waves. This airframe still creates high-pressure areas, but the shock waves are spread out. They don't intersect or reinforce each other, which should reduce overall noise levels.
Test pilot Nils Larson prepares for his first flight, July 2025. Photo: Lockheed Martin
The experimental X-59 aircraft has an overall length of 29 meters and a wingspan of 9 meters. A unique nose cone occupies approximately a third of the aircraft's length. A single-seat cockpit is located behind it. The fuselage houses fixed canards, a delta wing, and a conventional tail assembly. The aircraft's takeoff weight is 14,7 tons.
The aircraft is equipped with a single F414-GE-100 turbojet engine. Its estimated maximum speed is Mach 1,5, with a cruising speed of Mach 1,42. Its range and endurance were not disclosed. However, the experimental nature of the project means that record-breaking performance is not necessary.
The X-59 has all the necessary instruments for piloting in various conditions, navigation, and communications. To improve aerodynamics, a full-fledged canopy was eliminated. Forward visibility is provided by the eXternal Vision System. It includes video cameras located at the top and bottom of the fairing, the feed from which is displayed on a widescreen monitor in the cockpit.
Future technologies
Thus, one of NASA's most exciting modern projects is moving forward successfully and entering its most important and crucial phase. In the coming years, the X-59 experimental aircraft will demonstrate its real-world performance and prove the potential of the QueSST program's key solutions.
The actual results of the current work remain unknown. However, NASA and Lockheed Martin are optimistic about the future and expect the experimental aircraft to live up to expectations. If they are proven right, the QueSST program could have an impact on the development of civil aviation. However, this will only happen in the distant future.
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