Bell Advances VTOL X-Plane Programs

Bell Textron's X-76, designed for DARPA's SPRINT program, aims to blend helicopter versatility with jet-like speeds, targeting 400-450 knots. The goal is to create an aircraft capable of vertical takeoff and landing from unprepared surfaces, eliminating the need for runways. The X-76 utilizes a "stop-fold" rotor system, where wingtip proprotors provide vertical lift before folding away for high-speed cruise, transitioning to turbofan-based thrust. This design seeks to overcome the limitations of traditional rotorcraft like the V-22 Osprey, which experiences significant drag at higher speeds. The X-76 designation, revealed alongside the completion of its Critical Design Review (CDR), is a nod to the 250th anniversary of the United States, symbolizing American innovation. Following the successful CDR, the program is now in the manufacturing, integration, and ground testing phase, with flight testing slated for early 2028. DARPA envisions both crewed and uncrewed versions of the X-76, potentially serving roles such as combat search and rescue, ISR, and strike operations. Bell demonstrated the folding rotor and integrated propulsion on a high-speed sled in 2023.