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