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The teardrop-shaped item is the engine's liquid propellant gas generator. Essentially an inefficient rocket engine itself, the LPGG generates high-velocity gasses which are used to spin the turbine, powering the turbopumps.

Picture 2 of 2.

The LPGG is tucked between the heat exchanger and the thrust chamber. This photo was taken from the near the floor, looking up at the engine as it is displayed.

Propellants are fed to the LPGG from the flange at the left.

Note the attach point for the solid propellant gas generator, connected to the LPGG, toward the upper right.

The turbine is visible in the upper left and the heat exchanger runs diagonally across the top right of this photo.

 
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Time picture taken Fri Jul 13 11:07:42 2007
Location picture taken Main Indoor Exhibit Gallery
"Old" Museum
U.S. Space & Rocket Center
Huntsville, AL
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