The F-16XL was a radical redesign that lost the war for the skies

Countries & Cities · Published 10 October 2026 Swipe more like this →

In short: Designed to dominate the battlefield, the F-16XL featured a unique cranked-arrow delta wing that promised superior supersonic performance. Despite its impressive payload capacity and aerodynamic advancements, it ultimately lost the 1981 Enhanced Tactical Fighter competition to the F-15E Strike Eagle, leaving only two prototypes to shape future aeronautical research.

The F-16XL project began under the leadership of Harry Hillaker, the original designer of the F-16. Seeking to enhance both air-to-air and air-to-ground capabilities, the team explored various configurations before settling on the cranked-arrow delta wing, which offered a higher lift-to-drag ratio at supersonic speeds. By late 1980, the design was finalized, and the United States Air Force provided two production F-16 fuselages for conversion into the only two F-16XL prototypes ever built.

In the 1981 competition to replace the F-111 Aardvark, the F-16XL faced off against the McDonnell Douglas F-15E. While the F-16XL boasted significant structural changes—including a fuselage lengthened by 56 inches and a wing 115% larger than the original—it required more time and money to produce than the F-15E. The F-15E also benefited from having two engines, providing greater redundancy and higher maximum takeoff weight. Consequently, the Air Force awarded the contract to McDonnell Douglas in February 1984.

Following its military rejection, the F-16XL found a second life with NASA. From 1988 to 1999, the aircraft served as a testbed for supersonic laminar flow research, critical for developing high-speed civil transport. Engineers installed active and passive suction gloves on the wings to manage turbulent airflow, utilizing technology like laser-cut titanium skins and turbocompressors salvaged from other aircraft. Although the program did not achieve all its laminar flow goals, NASA deemed the research successful before the aircraft were retired in 2009.

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