Phantom Eye, a hydrogen-powered demonstrator that will stay aloft at 65,000 feet for up to four days, is a key part of Phantom Works’ rapid prototyping initiative. Powered by two 2 liter, four-cylinder engines that provide 150 horsepower each, and a 150 foot wing span, Phantom Eye will cruise at approximately 150 knots and can carry up to a 450-pound payload. Primary missions for the aircraft include persistent intelligence, surveillance and reconnaissance, as well as communications, for customer in the defense, civil and commercial markets.