China is building a mach 40 wind tunnel to test hypersonic weapons
China is building the world’s fastest wind tunnel to simulate hypersonic flight at speeds of up to 12 kilometers per second (mach 40, 43200 kph, 26843 mph). A hypersonic vehicle flying at this speed from China could reach the west coast of the United States in less than 14 minutes. Zhao Wei, a senior scientist …