dsca9170.jpg

Detail of the flat spot on the fuel inlet manifold; on an actual thrust chamber, there would be a fuel inlet here with a flange onto which the fuel high pressure duct would be bolted.

Picture 2 of 2.

On this particular test turbopump, I'm not certain where the discharge from the fuel turbopump was directed. On an actual thrust chamber, 70% of the fuel would have been directed down the regenerative cooling tubes comprising the thrust chamber, but of course this is a truncated thrust chamber (and many tubes have had sections removed).