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NASA Pathfinder by AeroVironment
Originally tested at Area 51 under Project HALSOL in 1983, the Pathfinder is a solar-powered UAV. Following declassification it served as a NASA test aircraft in the early 90s. The Pathfinder was the basis for both the Centurion and Helios.
Tests at Area 51 were cancelled when data concluded technology for both energy storage and photovoltaic cells were not mature enough for operational use.
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