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Sunday, 19 October 2025

American Radar Picket SSR Submarine Migraine III conversion Raton 270 (1942) 1952-1973

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Part of the Gato-class diesel-electric submarines preceded by Mackerel-class succeeded by Balao-class. Original displacement 1,525 (surfaced)-2,424 (submerged) tons and as dimensions 311.8-311.10 x 27.3 x 17 (maximum) feet. After the conversion was the displacement 1,700 (surfaced)-2,308 (standard) tons and the dimensions 341.6 (over all) x 27.4 (maximum) feet. Instead of original armament of 10-53.3cm/21” torpedo tubes remained just the six bow torpedo tubes. Design agent Philadelphia Naval Shipyard yard was responsible for the actually convenversion. The boats were cut in half and next step was to add a 24-foot section between the forward compartment and the control room. This section was to accommodate the air-control center and required electronic equipment. The stern torpedo room was converted into berthing space resulting in the loss of torpedo tubes.

Laid down by Manitowoc Shipbuilding Company, Manitowoc, Wisconsin, USA on 29 May 1942, launched on 24 January 1943, commissioned on 13 July 1943, decommissioned on 11 March 1949, converted into a radar picket submarine between 1952-1953, recommissioned on 21 September 1953, decommissioned on 28 June 1969, stricken on 28 June 1969 and sold to be broken up on 12 October 1973.

Sources

ONI 31-2A. Submarine sighting Guide, dated June 1958.

John D. Alden. The Fleet Submarine in the U.S. Navy. A design and construction history.

N. Friedman. U.S. Submarines Since 1945: An Illustrated Design History.

Wikepedia.

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