With a design goal of staying aloft for five days, the U.S. Air Force’s Orion medium-altitude, ultra-long-endurance unmanned aircraft demonstrator has completed its second phase of flight tests. Developed by Aurora Flight Sciences and first flown in August 2013, the twin-engined Orion has so far accumulated 46 hr. of flying in 13 flights – the longest of them lasting 16 hr., according to the Air Force program office. The Orion is designed to fly for 120 hr. at 20,000 ft. carrying ...


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