Boeing's New Unmanned Spy Plane Can Stay at 65,000 Feet for 4 Days
Boeing's new Phantom Eye UAV is powered by hydrogen, making it a very fuel efficient vehicle capable of flying at more than 12 miles of altitude for 4 days at a time. From the company's press release: "The pr...
https://www.neatorama.com/2010/07/12/boeings-new-unmanned-spy-plane-can-stay-at-65000-feet-for-4-days/