The Boeing SolarEagle (Vulture II) was a proposed High-Altitude Long Endurance (HALE) unmanned aerial vehicle solar-electric spy plane developed by Boeing Phantom Works.
[1] The proposed aircraft had a wingspan of 393.7 feet (120.0 meters), and was intended to remain airborne for up to five years at a time without needing to land.
[2] It had 20 motors of the same type as the Qinetiq Zephyr designed by Newcastle University.
[4] It was slated to make its first flight in 2014, but in 2012 the SolarEagle project was cancelled[5] and DARPA's Vulture program was refocused on advancing photovoltaic and energy storage technologies.
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