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dsc87059.jpg

Detail of the H-1 injector.

Picture 3 of 4.

I have no reference diagrams for the H-1 injector, but I assume that the larger, ringed orifice on the injector is a fuel igniter housing, used to deliver the pyrophoric fluid (which is hypergolic with oxygen) from the hypergol cartridge to initiate combustion. This would be similar to the LR-89 (Atlas booster) engine injector and the F-1 injector.

 
H-1 Engine (Davidson Center) at U.S. Space and Rocket Center
Time picture taken Sun Jan 13 13:25:44 2013
Location picture taken Saturn V Hall
Davidson Center for Space Exploration
U.S. Space & Rocket Center
Huntsville, AL
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