Bell Textron has completed wind tunnel tests at the National Institute for Aviation Research (NIAR) at Wichita State University to support the DARPA Speed and Runway Independent Technology (SPRINT) program. This phase of testing comes after the successful assessment of the Stop/Fold rotor system conducted at the Holloman High-Speed Test Track (HHSTT) in New Mexico in 2023.
Building on the earlier folding rotor tests, the wind tunnel program confirmed the aircraft's stability and control during the rotor's folding and unfolding sequence in flight. These two essential risk reduction tests collectively demonstrate that the concept is prepared to advance to a flight demonstration under the DARPA SPRINT program.
“After completing folding rotor transition testing on the sledge at Holloman Air Force Base last year, we’re thrilled to have now completed this next phase of testing,” said Jason Hurst, executive vice president of engineering at Bell. “Bell’s advanced Stop/Fold family of systems will revolutionize the speed, range and survivability of vertical lift aircraft to enable operations in contested environments. We are excited to be part of another aviation milestone with this breakthrough technology.
Bell is presently engaged in Phase 1B of the DARPA SPRINT initiative. This program aims to design, construct, and test an experimental aircraft (X-Plane) to showcase the essential technologies and integrated concepts required for a revolutionary blend of aircraft speed and runway independence, crucial for the future of air mobility and air combat platforms.
Bell's versatile Stop/Fold configurations combine modern jet speed with the ability to operate without the need for runways, delivering enhanced capabilities that will transform the battlefield for the nation's military. This ability to use available runways for maximum payload and range, along with powerful vertical lift, allows Agile Combat Employment (ACE) from nearly any location—providing a unique strategic advantage, particularly in the Indo-Pacific area.
In a setting with restricted runways, extensive distances, and a contested battlespace, this aircraft delivers the critical speed and range necessary to fulfil mission requirements. This distinctive blend of capabilities is also perfectly tailored for Special Operations, boosting speed, reach, and survivability for our most demanding and sensitive missions.
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