View of the "cat eyes," openings between the regenerative cooling tubes where
the turbine exhaust gases are dumped. Dumping the turbine exhaust into the
thrust chamber in this fashion enhanced the engine's specific impulse.
The engine also employs a "pass and a half" regenerative cooling scheme: The
hydrogen fuel is introduced at the fuel inlet manifold, where an additional
regenerative cooling tube, running only from the fuel inlet manifold to the
engine's exit plane, is added to the full-length tubes.
Picture 3 of 3.