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Halcyon-class minesweeper
The ''Halcyon'' class was a class of 21 oil-fired minesweepers (officially, "fleet minesweeping sloops") built for the British Royal Navy between 1933 and 1939. They were given traditional small ship names used historically by the Royal Navy and served during World War II.
==Design==
There were 21 ships in the ''Halcyon'' class, built in two groups; the first using reciprocating steam engines, with steam turbines in the latter. They were generally smaller versions of the ''Grimsby'' class escort sloops. ''Niger'' and ''Salamander'' of the reciprocating group used vertical triple expansion engines, instead of the vertical compound engines of their sisters. As a result of the increased installed power they had a half knot speed advantage, even though they used slightly shorter hulls. The turbine ships used the same shorter hulls as ''Niger'' and ''Salamander'', but with lower installed power, speed dropped back to .
''Gleaner'', ''Franklin'', ''Jason'' and ''Scott'' were completed as unarmed survey vessels, ''Sharpshooter'' and ''Seagull'' being converted to follow suit. They were all re-armed and deployed in their original role on the outbreak of war. ''Seagull'' had the first all-welded hull built for the Royal Navy.〔Lenton, p.252〕
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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