DARPA's Sprint X-plane project aims to demonstrate technology for a 400-kt-plus stop/fold tiltrotor transport.
Credit: DARPA
The decades-long quest to hover with the agility of a helicopter and dash with the speed of a fighter is gaining renewed urgency as fixed runways come under threat in a way not seen since the 1960s and the depths of the Cold War. Back then, the vulnerability of air bases in Europe and the UK to...
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