Hypersonic Wind Tunnel test facility inaugurated at DRDO Updated: Updated: December 20, 2020 00:19 IST India is the third country after the US and Russia to have such a large facility Share Article AAA Defence Minister Rajnath Singh and Union Minister of State for Home Kishan Reddy at DRDO on Saturday. India is the third country after the US and Russia to have such a large facility Defence Minister Rajnath Singh inaugurated the advanced Hypersonic Wind Tunnel (HWT) test facility at the DRDO’s Dr. APJ Abdul Kalam Missile Complex here on Saturday. The state-of-the-art HWT test facility is a pressure vacuum driven enclosed free jet facility having nozzle exit diameter of one metre and will simulate Mach No. 5 to 12 speeds. (Mach represents the multiplication factor to the speed of sound.)