THE FOREVER PLANE

摘要

Nine days: That's the longest any airplane has stayed in the air. Burt and Dick Rutan's Voyager set the record in 1986 by flying 24,986 miles around the world without refueling. But nine days of uninterrupted flight won't cut it for Darpa, the Pentagon's advanced-research organization. It's challenged the aviation industry to come up with an unmanned surveillance and communications plane that can circle targets for half a decade-and do so on nothing but solar power.