High-Flying Solar Power Zephyr Glider Breaks Own World Record With 3.5 Day Flight
Last we heard from the U.K.’s high altitude Zephyr glider, it was unofficially breaking the record for longest unmanned flight. That was back in 2007, when the record was a paltry 30 hours, and the Zephyr was able to manage a 54 hour flight, thanks to its solar powered batteries. On Friday, the Zephyr flew…