Country of Origin: United States of America
Overall: 8 in. wide x 1 ft. 8 3/4 in. long x 1 ft. 11/16 in. diameter (20.32 x 52.73 x 32.26cm)
Case, of Ladish D6 AC, a light weight, high-strength titanium alloy; nozzle, reinforced plastic, a composite glass cloth (molded vitreous silica phenolic resin), carbon cloth and bulk carbon, designed to withstand 5,200 degrees Fahrenheit exhaust gases. Throat insert of Graph-I-Tite G-90.
This is a Gemini retro rocket that provided a means of slowing down the two-man Gemini Earth-orbiting U.S. manned spacecraft to permit its reentry into Earth's atmosphere. Four of the solid-fuel rockets fired successively. The rockets could also be used to separate the spacecraft from the launch vehicle in case of a high altitude launch abort but were never used for that purpose.
The retro rocket was fitted onto the top half of the spacecraft's adapter section. The motor produced a thrust of 2,580 pounds for about five seconds. The retro system was used in all ten manned Gemini missions from 1965-1966. This motor was donated to the Smithsonian in 1973 by the McDonnell-Douglas Corp.