The world's first large drone with four engines took its maiden flight on October 25 at the Zigong Fengming General Airport, southwest China's Sichuan Province. The drone, named Scorpion-D, was developed by Sichuan Tengden Sci-Tech Innovation Co. following the dual-engined Scorpion and the triple-engine Scorpion-A. All these drones share a twin-tailed design with a wingspan of over 20 meters. The drone will appear at the China International Aviation and Aerospace Exhibition, or the Zhuhai Airshow, opening on November 7.