What's Ahead in Aerospace: Helios solar-powered UAV shooting for two-day flight this summer
HELIOS: NASA's high-altitude, solar-powered Helios unmanned aerial vehicle (UAV) is gearing up for a long-endurance flight of nearly two days and nights later this summer to test its newly developed fuel cell-based electrical energy system, according to NASA. The 256-foot-wide flying wing will be...
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