USS S-20 (SS-125)

USS S-20 (SS-125)

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USS S-20 (SS-125)

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USS S-20 (SS-125) was a first-group (S-1 or "Holland") S-class submarine of the United States Navy. Her keel was laid down on 15 August 1918 by the Bethlehem Shipbuilding Corporation in Quincy, Massachusetts. She was launched on 9 June 1920 sponsored by Miss Anne Claggett Zell, and commissioned on 22 November 1922 with Lieutenant John A. Brownell in command.

S-20 was rebuilt in 1924, with a larger bow (similar to that of the V-1 class) to improve seakeeping and blisters on the upper hull to hold more fuel, but this modification was not repeated on any other members of the class.U.S. Submarines Through 1945 pp. 132U.S. Submarines Through 1945 pp. 137U.S. Submarines Through 1945 pp. 138 She was also used as an experimental engine test vessel, with a new high-speed geared-drive MAN diesel replacing her starboard engine in 1931.

In 1932, this new engine was replaced by a prototype diesel-electric plant. This was a MAN-type 16-cylinder engine running at even higher speed, driving an electrical generator, built by General Dynamics Electric Boat and designated 16VM1. Electricity produced by the generator was used to drive a high-speed electric motor geared to the shaft; there was no direct connection between the diesel engine and the shaft....
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