Proprotor blades stop and fold back and propulsion transitions from turboshaft to turbofan to accelerate the X-76 to speeds of about 400 kt.
Credit: Bell
The stop-fold tiltrotor uncrewed aircraft under development by Bell for a DARPA project to fly a high-speed vertical-takeoff-and-landing (VTOL) demonstrator has been designated the X-76. Under Phase 2 of DARPA’s Speed and Runway Independent Technologies (Sprint) project, Bell has completed the...
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