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Detail of several rows of shingles forming the inner wall of the nozzle extension.

The relatively cool exhaust from the gas generator is ducted through the turbine exhaust manifold and vented into the main thrust chamber exhaust gas flow. Some of the turbine exhaust flows between the inner and outer wall of the nozzle extension. The inner wall of the nozzle extension is comprised of 23 rows of these overlapping shingles and turbine exhaust is vented into the main exhaust flow at the injector slots where the shingles overlap. The turbine exhaust thus provides a relatively cool film, preventing the inner walls of the nozzle extension from melting.