An experimental high-altitude unmanned plane developed by Boeing Co completed a fifth flight on Saturday and may soon fly at 60,000 feet, a top Boeing executive said Tuesday.Boeing designed its “Phantom Eye” drone, which is powered by liquid hydrogen, to meet the U.S. military’s demand for high altitude, persistent surveillance.
It is a propeller-driven lightweight structure that Boeing says can fly continuously for four days, but executives say they are exploring larger variants that could stay in the air for up to 10 days.
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