Rocket Engine, Liquid Fuel, Propulsion System, Viking Orbiter

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This is the propulsion system of the type used by two identical Viking Orbiter spacecraft launched in 1975 which each entered orbits of the planet Mars in 1976. The system had three important functions. These were to: make course corrections during the trip to Mars, slow the spacecraft for Mars orbit insertion, and make Orbiter steering maneuvers during Mars orbit. The system consisted of a single 300 pound thrust, multistart rocket engine, mounted on a moveable gimbal. It used two side-by-side propellant tanks containing the fuel and oxidizer and a smaller, spherical tank for the helium used to force in the propellants into the combustion chamber. The propulsion system was transferred to the Smithsonian in 1996 from the NASA Jet Propulsion Laboratory.
NASA - Jet Propulsion Laboratory
Credit Line
Transferred from NASA, Jet Propulsion Lab
Restrictions & Rights
Usage conditions apply
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National Air and Space Museum Collection
Inventory Number
Country of Origin
United States of America
Main support ring, aluminum; tanks (3), stainless steel
Height, 9 feet 2 inches; diameter, 6 feet 9.5 inches;
Weight 450 LBS.
National Air and Space Museum
PROPULSION-Rocket Engines