The 9x15 is the most utilized low-speed propulsion acoustic facility in the world.
Description The 9- by 15-Foot Low Speed Wind Tunnel (9x15), housed in the return leg of the 8- by 6-Foot Supersonic Wind Tunnel, provides a unique facility for testing large-scale hardware in a continuous subsonic air stream. The test section is 9 ft. high and 15 ft. wide by 28 ft. long and provides airspeeds from 0 to 175 mph. The facility is used to evaluate aerodynamic performance and acoustic characteristics of nozzles, inlets, and propellers and to test short and vertical take off and landing aircraft systems.