China making fastest wind tunnel to test hypersonic weapons
China under its weapon development program is reportedly building the world's fastest wind tunnel to simulate hypersonic flights of 12 kilometres/second, which could carry an aircraft to the US within 14 minutes. The tunnel would detonate mixtures of oxygen, hydrogen and nitrogen to generate aircraft-testing shockwaves. Hypersonic aircraft can cross speeds of Mach 5, five times the speed of sound.