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With the wingspan , but not the weight, of a pterodactyl on steroids, the carbon fiber Zephyr ultra-lightweight unmanned aircraft can be launched like a paper airplane- if you can throw a 66 pound barbell overhand. Normally several men pick it up and toss it into the air.
Once there it can stay up for quite a while. By day the QinetiQ UAV flies on solar power generated by paper thin amorphous silicon photovoltaic arrays that cover the aircraft's wings. By night, or under cloud cover, its rechargeable lithium-sulfur batteries keep it aloft- it can find sun when it must by flying over the weather and into the stratosphere.
Recent trials validated modifications that have improved the efficiency of Zephyr's power system; new solar arrays supplied by United Solar Ovonic, a full flight-set of Sion Power batteries as well as a novel solar-charger and bespoke autopilot developed by QinetiQ allowed the aircraft to fly twice carrying a surveillance payload , first for 54 hours to a maximum altitude of 58,355 feet, and then for 33 hours 43 minutes to a maximum altitude of 52,247 feet. This is an unofficial un-fueled heavier than air endurance record, it being kind of hard to get the equivalent of the Guinness guys to hang around for that long. If the UAV jocks keep this up, expect the Swiss to retaliate , and next year's Book Of World Records to include the first chronometer certified 100 hour stopwatch.