In the past few years, the world's largest social network, Facebook, has been testing its solar-powered drone Aquila, according to Engadget, June 30 news. In June 2016, this networked drone conducted its first full-scale flight test in Yuma, Arizona, State, USA. After a 96-minute flight, it crashed when it landed. The accident prompted the US to investigate and found it crashed because of the strong wind. Facebook has just announced that it has conducted a second comprehensive test on May 22, with a total of 1 hours and 46 minutes of successful landing.
Facebook said they learned from the failure of the first flight test and improved the Aquila drone, including adding new "spoiler" wings to increase resistance and reducing lift during landing. The drone now has hundreds of of new sensors to collect data, improve autopilot software, and equip it with new radios, and horizontal propellers help slow down the plane as it lands.