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"  The Boeing Company released images of a new hydrogen-powered, high-altitude unmanned aircraft yesterday. The so-called Phantom Eye has not yet left the ground\u2014its virgin test flight is scheduled for early next year\u2014but its creators expect it to stay aloft at 65,000 feet for up to four days. Two 2.3-liter, four cylinder, 150-horsepower engines power the UAV. It has a 150-foot wingspan and should be able to carry a payload of 450 pounds.   &amp;quot;Phantom Eye is the first of its kind and could open up a whole new market in collecting data and communications,&amp;quot; Darryl Davis, president of Boeing Phantom Works, said yesterday at the unveiling ceremony in St. Louis. Boeing officials also played up the UAV&amp;#039;s green credentials, calling it efficient, with great fuel economy and low impact on the environment (it&amp;#039;s only byproduct is water).   This is not Boeing&amp;#039;s first venture into flying with hydrogen fuel cell-powered planes. Last October, the company successfully flew the world&amp;#039;s first manned aircraft powered by hydrogen fuel cells.   To prepare for its first flight, The UAV will ship to NASA&amp;#039;s Dryden Flight Research Center at Edwards Air Force Base, Calif., where it will begin a series of ground tests. "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.popularmechanics.com/military/a5938/boeing-hydrogen-uav-phantom-eye/>