There’s no longer any question about whether the US Army’s experimental flight of the solar-powered Zephyr UAV will break the aerial endurance record, only by how much the craft will shatter that mark with each additional day it remains aloft.
New BAE ‘pseudo satellite’ can remain aloft at 70,000 feet for a year
British aeronautic and defense giant BAE Systems has developed a solar-powered, stratosphere-flying drone that can act as a backup option to disabled communications satellites.