Date: ca. 1963-1968
Country of Origin: United States of America
Overall: 11 in. long x 5 in. diameter (27.94 x 12.7cm)
Other (Combustion chamber): 9 5/16 in. long (23.62cm)
Combustion chamber, concentric stainless steel shell lined with Rokide-Z ceramic coating; nozzle, molybdenum coated with a high emissivity material; a silcon carbide ring placed at the top of the combustion chamber with a silicone carbide throat insert around the internal throat; exposed surfaces of the vernier plumbing, coated with gold plate 0.001 inches thick and polished to a high luster.
This is a vernier rocket motor for the Surveyor unmanned lunar landing probe, America's first spacecraft to soft-land on the Moon. It provided small bursts of thrust for mid-course trajectory correction maneuvers and attitude and velocity control before and during the landing. It produced 30-104 pounds of thrust. For protection from solar radiation, exposed surfaces were coated with very thin gold plate.
The Reaction Motors Division of the Thiokol Chemical Corporation developed the vernier which was first used operationally on Suveyor 1 that soft-landed on the Moon in 1966. Five Surveyors out of seven launched were successfully landed on the Moon up to 1968.
The motor was donated to the Smithsonian by the Jet Propulsion Lab in 1970.
Transferred from the National Aeronautics and Space Administration