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View of the engine's steam duct and heat exchanger (the latter being the middle section).

Steam from the steam generator, after passing through the turbine to drive the turbopump, exited the turbine housing and passed through the heat exchanger.

Liquid oxygen and pressurized air from the air storage spheres were passed through coils in the heat exchanger, where they were heated by the exhaust steam. The resulting gaseous oxygen was used to pressurize the LOX tank and the expanded air was used to pressurize the alcohol tank and for the stage pneumatic system.