Another design from Walter, the high-speed submersible P476, in two iterations (taken from the BA/MA archives, RM 25/6235. The Walter turbine is quite clear, as well as the gun emplacements, same as the ones depicted in the 16/06/1943 3.rd design of the Type XXI, apparently Flak 38 without power operation. The P477, as well as the Pre-Type XXI, are published in "Ingenieurbüro Glückauf", by the late Eberhard Rössler.
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