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Detail of the downward-facing elbow on the injector.

Picture 4 of 4.

This elbow tapped gaseous hydrogen off from the injector to refill the engine's start tank. Approximately 60 seconds of mainstage engine operation are required to recharge the start tank.

During my 2013 visit, the elbow's opening was covered with tape, but the weather had removed this closure prior to my 2014 visit.

 
Gaseous hydrogen elbow on J-2 Engine Thrust Chamber J-2111 injector to provide GH2 for start tank refill at Marshall Space Flight Center
Time picture taken Tue Sep 16 09:31:26 2014
Location picture taken Building 4205
Marshall Space Flight Center
Huntsville, AL
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