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Detail of the preheater copper tubing coils.

High-pressure air from the torpedo's air flask section is admitted to the afterbody via a fitting on the turbine bulkhead. It passes through the large-diameter copper tubing, where the air is warmed by the turbine exhaust gasses before being routed to the combustion flask.

 
Air flask preheater on the Cutaway Mark 23 Torpedo Afterbody at the Wisconsin Maritime Museum
Time picture taken Sat Sep 23 12:25:56 2017
Location picture taken Museum Galleries
Wisconsin Maritime Museum
Manitowoc, Wisconsin
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