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dsc85545.jpg

Detail of the center of the H-1 injector.

I'm not certain why there's a large, round hole at the center of the injector. While I've never read anything in this regards for the H-1 engine, the F-1 rocket engine has a similar hole at the center for a throat closure.

 
H-1 Engine (Davidson Center) at U.S. Space and Rocket Center
Time picture taken Sat Jul 21 11:59:32 2012
Location picture taken Saturn V Hall
Davidson Center for Space Exploration
U.S. Space & Rocket Center
Huntsville, AL
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