A hybrid propulsion system designed to make small battlefield drones stealthier and go further has passed its flight tests, according to Chinese state media. The system’s motor is driven by fuel-powered electricity, combining two systems to make the best of both, according to a report on Friday on CCTV-7, China’s military television channel. Drone propulsion has largely followed two distinct paths. Fuel-powered systems are typically used in bigger uncrewed aircraft, offering strong performance...