DARPA’s VTOL X-Plane phase 2 concept – video
DARPA unveils its next VTOL X-Plane concept, with improvements in vertical and cruising flight.
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DARPA unveils its next VTOL X-Plane concept, with improvements in vertical and cruising flight.
Today, February 29th, is a leap day, a calendar system that started in 46 BC by Julius Caesar, adding one leap day every four years.
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