https://phys.org/news/2018-11-china-drone-stealth-aircraft.html > A delta-winged stealth drone received much attention, highlighting China's growing production of sophisticated unmanned aerial vehicles seeking to compete with the US military's massive fleet. > The CH-7—a charcoal-grey UAV unveiled at the air show—is the length of a tennis court with a 22-metre (72-feet) wingspan. It can fly at more than 800 kilometres (500 miles) per hour and at an altitude of 13,000 metres (42,650 feet).