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HMS Black Swan (L57)
HMS ''Black Swan'', named after the Black swan, was the name ship of the sloops of the Royal Navy. This class was admired for its sea-going qualities.
==Construction and design==
''Black Swan'' was laid down by Yarrow Shipbuilders on 20 June 1938, launched on 7 July 1939, and commissioned on 27 January 1940.〔Hague 1993, p. 76.〕
The ''Black Swan'' class was a lengthened version of the earlier s. The main gun armament consisted of six QF 4 inch Mk XVI anti-aircraft guns in three twin turrets, with the fourth 4 inch turret of the Egret class removed to allow addition of a quadruple barrel 2-pounder pom-pom short-range anti-aircraft gun. Anti submarine armament consisted of depth charge throwers with 40 depth charges carried.〔Gardiner and Chesneau 1980, p. 57.〕〔Hague 1993, p. 16.〕
When completed, ''Black Swan'' was not fitted with the planned quadruple pom-pom, with two quadruple Vickers .50 machine gun mounts fitted instead. The pom-pom was installed in May 1941, and the ineffective〔Gardiner and Chesneau 1980, p. 6.〕 machine guns replaced by a single Oerlikon 20 mm cannon in September that year. The Hedgehog anti-submarine weapon and two more 20 mm cannon were fitted in June 1942, and a further three cannon were fitted in 1943.〔Hague 1993, p. 76.〕 The ship's depth charge complement was increased to 110 during the war.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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