See The Drone That Can Fly For Years on Solar Power

While most of the exotic aircraft on display at this year’s Farnborough Airshow still need a pilot, unmanned vehicles have become more and more common in recent years.

Flying robots have some key advantages over conventional aircraft – as the BBC’s Theo Leggett found out from Paul Stevens, chief engineer of Airbus’s high altitude pseudo-satellite (HAPS) Zephyr – a drone designed to fly at altitudes of up to 20km for years at a time on solar power alone


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