Jacks on Exterior of the 10- by 10-Foot Supersonic Wind Tunnel

Screwjacks located on the exterior of the second throat section in the 10- by 10-Foot Supersonic Wind Tunnel at the National Aeronautics and Space Administration (NASA) Lewis Research Center. The 10- by 10 tunnel was the most powerful propulsion wind tunnel in the country when it began operating in 1956. The facility can generate wind speeds from Mach 3 to 3.5. A flexible wall nozzle located just upstream from the test section can be adjusted using screw jacks to produce the desired air flow. The 61-foot long second throat, seen here from the outside, was located just beyond the test section. It slows the supersonic air flow down to prevent shock waves. The second throat’s side walls can be adjusted up to three inches on each side using these electrically-driven screwjacks. The air and the 1.25-inch thick walls are cooled by water injection. During the 1960s the 10- by 10-foot tunnel supported the development of virtually all US launch vehicle systems. It was used for Atlas-Centaur, Saturn rockets, and Atlas-Agena testing.