Bell Textron Inc. has completed wind tunnel testing to validate the transition capability of its Stop/Fold rotor systems . These tests, conducted at the National Institute of Aviation Research (NIAR) at Wichita State University, support the development of the DARPA SPRINT program , which aims to transform military aviation and advanced air mobility platforms.
Critical testing of the Stop/Fold rotor in the wind tunnel
Bell’s Stop/Fold rotor system, which combines jet-like quickness with vertical takeoff and landing capability, has been rigorously tested to ensure stability and control during transitions between folded and deployed rotor modes. These tests, which follow a series of successful evaluations at the Holloman High-Speed Test Track (HHSTT) in 2023 , confirm the system is ready to advance toward a flight demonstration.
With this phase of testing, we are getting closer to an aircraft capable of operating in highly competitive environments, where speed, range and survivability are crucial.
Bell Executive Vice President of Engineering Jason Hurst said.
Bell transforms aviation with the Stop/Fold system
Scalable Stop/Fold configurations are designed to deliver speed comparable to modern jets , combined with the runway independence required to operate in challenging conditions. This capability is vital to conducting Agile Combat Airlift (ACE) missions in regions with limited runways or contested battlespaces, such as the Indo-Pacific area.
In addition to their use in military aviation, these advanced technologies also have potential applications in special operations, where speed and range are essential to mission success. Bell continues to lead in aeronautics technology , delivering transformative air mobility solutions that could change the way armed forces execute their most challenging missions.
Bell is currently in Phase 1B of the DARPA SPRINT program , which seeks to develop an experimental aircraft (X-plane) capable of combining extreme speed and runway autonomy. The successful testing of the Stop/Fold system strategically positions Bell to lead the development of next-generation air platforms that meet the demands of defense missions and chart a path toward operational runway independence.
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Source and photos: Bell
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