Phantom
Eye's two hydrogen fuel tanks also were successfully filled
with nitrogen to test fueling procedures and the aircraft's
full-fuel weight configuration.
Phantom
Eye has a 150-foot wingspan and is powered by two 2.3-liter,
four-cylinder hydrogen engines that each provide 150 horsepower.
It is designed to fly at 65,000 feet for up to four days;
perform intelligence, surveillance and reconnaissance
missions; and serve as a communications relay.