Boeing has unveiled the hydrogen-powered Phantom Eye unmanned airborne system, a demonstrator that will stay aloft at 65,000 feet for up to four days.
Later this summer, Phantom Eye will be shipped to NASA’s Dryden Flight Research Center at Edwards Air Force Base, Calif., to begin a series of ground and taxi tests in preparation for its first flight in early 2011. That debut flight is expected to last between four and eight hours.