AeroVironment Helios Prototype
Aircraft model
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The Helios Prototype was the fourth and final aircraft developed as part of an evolutionary series of solar- and fuel-cell-system-powered unmanned aerial vehicles. AeroVironment, Inc. developed the vehicles under NASA's Environmental Research... Wikipedia
Developed from: NASA Pathfinder, Pathfinder Plus and NASA Centurion
First flight: September 8, 1999
Role: Unmanned aerial vehicle