The short version
- NASA is using the X-59 jet to test if elongated nose designs can reduce sonic booms to levels acceptable for overland flight.
- The aircraft combines parts from existing military jets and relies on camera feeds due to its extreme cockpit placement.
- Experts debate whether crewed experimental planes are still cost-effective compared to rapidly advancing drone technology.
A distinctive jet with an elongated nose resembling that of an anteater is currently conducting flight tests over the United States, marking a significant step in NASA’s effort to revive supersonic commercial travel. The X-59 aircraft is designed specifically to address the sonic boom problem that previously restricted planes like Concorde to oceanic routes and barred them from flying over land. By flattening the shockwaves generated when breaking the sound barrier, the project aims to transform these disruptive booms into soft thumps comparable to a car door closing across the street.
The design philosophy behind the X-59 prioritizes minimalism and specific goal achievement rather than multifunctional capability. Peter Coen, a NASA veteran managing the program, notes that adding more objectives increases costs significantly. Consequently, this experimental craft focuses solely on suppressing sonic booms within a constrained budget. It is part of a long lineage of X-planes dating back to 1947, including the Bell X-1, which first broke the sound barrier, and the X-15, which reached the edge of space and helped develop heat-resistant materials for the Space Shuttle.
To achieve its unique aerodynamic profile, the X-59 incorporates components from various existing aircraft. Its cockpit and ejection seat are sourced from a T-38 training jet, while landing gear comes from an F-16 fighter and the engine from an F-18. Because the cockpit is positioned far back to maintain the streamlined nose, pilots cannot see forward directly. Instead, they rely on a camera system that feeds video to a screen in front of them, requiring instantaneous computer processing to ensure safe navigation during high-speed maneuvers.
The current testing phase involves flying the aircraft over selected U.S. towns while conducting community surveys. NASA seeks to determine what level of noise is tolerable for residents on a regular basis. This data is crucial for potentially revising federal regulations that currently prohibit supersonic flight over land. If successful, the findings could open lucrative domestic routes for future commercial airliners capable of traveling at Mach 1, approximately 660 miles per hour at cruising altitude.
Despite the success of past crewed experimental programs, questions remain about the necessity of human pilots in an era dominated by drone technology. The rapid development of unmanned systems, particularly evident in modern conflicts such as the war in Ukraine, has led some to suggest that drones could replace crewed test beds. NASA initially considered an uncrewed version of the X-59 but determined that removing the pilot would introduce significant certification complexities and costs associated with operating a robot jet over urban areas.
Furthermore, the physical size required for the X-59 to accurately simulate an airliner punching through the sound barrier necessitated space for a cockpit. While smaller drones like the X-48, which tested blended wing designs in 2007, proved cost-effective due to their reduced scale, larger supersonic tests present different challenges. Coen acknowledges that future X-planes will likely be uncrewed unless the research specifically relates to piloting or if keeping a human on board proves more economical than managing complex remote operations.
Critics of the shift toward unmanned testing argue that drones cannot fully replicate the insights gained from human pilots. Guy Gratton, a professor at Cranfield University, emphasizes that while drones have demonstrated remarkable capabilities in military applications, they fall short when it comes to carrying passengers or providing nuanced feedback during flight tests. He points out that losing a pilot means missing valuable lessons that only a human can identify, potentially requiring four times as many ground staff to monitor and interpret drone signals.
The debate highlights a broader tension in aerospace innovation between cost efficiency and comprehensive data collection. Historical examples like the UK’s Experimental Aircraft Programme, which tested systems for the Typhoon fighter, show the value of direct pilot feedback in validating designs. As NASA continues its work with the X-59, the agency must balance the proven benefits of crewed experimentation against the growing allure of cheaper, unmanned alternatives. The outcome of these tests will not only influence future aircraft design but also shape regulatory frameworks for supersonic travel.
Sources behind this briefing
Go to the original reporting
- BBC Technology↗X-planes: Are they needed in the new era of drones?
