Stennis Space Center Site Index
J-2 Engine Gallery


The white, spherical start tank. The start tank contains pressurized hydrogen gas (initially from a ground source, but is refilled during S-IVB engine operation to allow for engine restart) which is used to provide the initial spin on the turbine, bootstrapping the turbopumps.

Picture 1 of 2.

Time picture taken Tue Jun 14 11:18:58 2005
Location picture taken Rocket Park
Visitor Center
Stennis Space Center, MS
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