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The MASTIF, or Multiple Axis Space Test Inertia Facility, was installed at the Altitude Wind Tunnel at the Lewis Research Center, now John H. Glenn Research Center. Three tubular aluminum cages could revolve separately or in combination to give roll, pitch and yaw motions at speeds up to 30 revolutions per minute, greater than those expected in actual space flight. Nitrogen-gas jets, attached to the three cages, controlled the motion. NASA engineers built the entire rig inside a test chamber in the research center's old Altitude Wind Tunnel. At the center of the innermost cage, the pilot was strapped into a plastic seat, similar to that in the Mercury capsule. His head, body and legs were held in place, leaving only his arms free. The pilot actuated the jets by means of a right-hand control column. Communication was by radio, which was operated by a button atop the left-hand column. An operator at the control station started the complex tumbling motions, and then switched control to th...