![Airbus's High Altitude Pseudo-Satellite (HAPS) Zephyr](https://webarchive.archive.unhcr.org/20170808032240im_/https://ichef-1.bbci.co.uk/news/640/cpsprodpb/EC34/production/_90386406_zephyr-7-close.jpg)
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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14 Jul 2016
- From the section Business