What goes up, must come down … eventually. That’s the principle U.S. military research agency DARPA wanted to stretch to its limit when it dreamed up the Vulture project, an unmanned spy plane that could stay aloft for five years.
Last year, it challenged aircraft designers to come up with a plan that could keep a half-ton payload flying for a long, long time, and now the research group is said to be close to awarding a contract to build such a plane.
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