The Zero Gravity Research Facility at the NASA Glenn Research Center, in Cleveland, Ohio, is a unique facility designed to perform tests in a reduced gravity environment. It has successfully supported research for United States crewed spacecraft programs and numerous uncrewed projects. The facility uses vertical drop tests in a vacuum chamber to investigate the behavior of systems, components, liquids, gases, and combustion in microgravity.
The facility consists of a concrete-lined shaft, 28 feet (8.5 m) in diameter, that extends 510 feet (160 m) below ground level. A steel vacuum chamber, 20 feet (6.1 m) in diameter and 470 feet (140 m) high, is contained within the concrete shaft. The pressure in this vacuum chamber is reduced to 13.3 pascals (1.3×10−4 atm) before use. Test equipment is typically mounted in a cylindrical container, and has a maximum weight of 2,500 pounds (1,100 kg). Equipment dropped in the chamber experiences microgravity for about 5.15 seconds before landing in a deceleration cart filled with expanded styrofoam beads; it typically experiences 32g during deceleration, but may range up to 65g.
The service building at the top of the shaft contains a shop area, control room, and a clean room. Assembly, servicing, and balancing of the experiment vehicle are accomplished in the shop area. Tests are conducted from the control room, which contains controls for the "pump down" of the vacuum chamber, the experiment vehicle pre-drop checkout, release and the data retrieval system.[2]
^"National Register Information System". National Register of Historic Places. National Park Service. April 15, 2008.
^"Zero-Gravity Research Facility". Man in Space: National Historic Landmark Theme Study. National Park Service. June 11, 2008.
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