Overall view of the upper-left portion of the combustion chamber and injector. Note the radial baffles on the
injector face.
The silver circles which look like flat-head screw heads are igniter fuel
housings. The F-1
Rocket Engine Technical Manual: Engine Data (R-3896-1) describes
how two igniter fuel housings are located in each of the 12 outer compartments
and one in the center compartment. Fed by individual igniter
fuel feed tubes from the igniter manifold, they injected igniter fuel
into the compartments. The igniter fuel (from the hypergol manifold) was composed of 85%
triethylborane and 15% triethylaluminum, and ignited upon contact with oxygen,
causing spontaneous combustion and establishing thrust chamber ignition.
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