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Overall view of the S-3D rocket engine turbine exhaust duct and heat exchanger.

The turbine is just visible at the top of this photo. Next is an elbow and bellows, followed by the heat exchanger. Aft of the heat exchanger is another bellows section and the duct leading to the turbine exhaust port; the exhaust port was used to provide roll control to the missile in flight.

Note the tubing which would have been used to carry pressurant into the heat exchanger and then the heated gases out and to the propellant tanks to provide pressurization.

Picture 2 of 2.