This is a scale model of a SERT (Space Electric Rocket Test) 2 cesium ion rocket engine. Developed in the mid-1960s for use as attitude control thrusters on spacecraft, engines like this one produced minute streams of ions generating extremely low levels of thrust. Unlike conventional chemical propulsion systems, ion engines could be fired for extremely long durations.
This model represents the type of engine test fired on February 3, 1970 aboard a Thor-Agena D launch vehicle. Unlike SERT I, which was battery powered, SERT 2 used solar cells. On this maiden flight into earth orbit, two SERT 2 thrusters operated continuously for 3,782 hours (more than five months) and 2,011 hours (nearly three months) respectively. Electrical malfunctions prevented both engines from firiing for their planned durations of six months.
Work on ion propulsion systems of this type continued at NASA into the mid-1970s.
Display Status
This object is not on display at the National Air and Space Museum. It is either on loan or in storage.
Object Details
Country of Origin
United States of America
Type
PROPULSION-Miscellaneous
Manufacturer
NASA, Lewis Research Center
Dimensions
Overall (Bottom Piece): 7.9 × 12.1cm (3 1/8 × 4 3/4 in.)
Overall (Top Piece): 13.7 × 7.6cm (5 3/8 × 3 in.)
Overall (As if assembled): 21.6 × 12.1cm (8 1/2 × 4 3/4 in.)
Materials
White metal (visually characteristic of stainless steel), iron alloy, copper alloy, glass, high-fired ceramic
Inventory Number
A19760724000
Credit Line
Transferred from the National Aeronautics and Space Administration
Data Source
National Air and Space Museum
Restrictions & Rights
Usage conditions apply
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