The Cold War Jet That Proved Vertical Takeoff Works Then Got Canceled Anyway

The X-13 Vertijet was a groundbreaking aircraft developed by McDonnell Douglas during the late 1960s as part of the United States Air Force’s research into vertical takeoff and landing (VTOL) technology. This experimental jet demonstrator successfully demonstrated that pure-jet VTOL capabilities were achievable, marking a significant milestone in aviation engineering at Edwards Air Force Base in California. However, the Vertijet's unique design presented considerable challenges regarding its landing procedure, requiring a runway for final touchdown after achieving vertical flight. Consequently, the project faced insurmountable difficulties due to this impracticality, leading to its cancellation in 1969. Despite its innovative concept and successful proof-of-concept, the X-13 Vertijet ultimately failed to transition from an experiment to operational service.