That didn't end the Defense Fifa 14 Ultimate Team Coins Department's

That didn't end the Defense Fifa 14 Ultimate Team Coins Department's appetite forlong-flying drones. But the alternative paths chosen so far haven'tpaid off. Another AeroVironment aircraft, the Global Observer -- apurely hydrogen-powered drone with a 70-foot wingspan designed forweek-long missions -- crashed in 2011, resulting in the terminationof the program by the Pentagon. Boeing has its ownhydrogen-powered, long-endurance drone, the Phantom Eye, indevelopment; so far its longest flight has been just over twohours.

Titan's aircraft plans are more modest and much more ambitious atthe same time. Solara 50 will have a payload of just 70 pounds (31kilograms)-- though depending on the time of year and location ofthe flight, longer daylight hours could sustain flights withheavier payloads. The next design, the Solara 60, will carry up to250 pounds (115 kilograms). Instead of using hydrogen fuel cells,the Solara aircraft use batteries charged from solar panels topower flight at night and provide about 100 watts of power to theaircraft's payload as well.