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The cylindrical solid propellant gas generator.

The SPGG is used during engine start: The SPGG is ignited and the resulting high-velocity gasses spin the turbine, powering the turbopump. This bootstraps the engine, and before the SPGG is expended, sufficient propellants are being delivered to the liquid propellant gas generator for the LPGG to take over.

Picture 1 of 2.

 
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Time picture taken Fri Jul 13 11:00:24 2007
Location picture taken Main Indoor Exhibit Gallery
"Old" Museum
U.S. Space & Rocket Center
Huntsville, AL
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