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The ''Active''-class cruiser was a trio of scout cruisers built for the Royal Navy in the first decade of the 20th century. The three ships that made up the class were , and . ==Design and description== They were the last class of scout cruisers built for the Royal Navy as they were too slow to lead destroyers in battle or to defend the fleet against enemy destroyer attacks. The ''Active'' class was a slightly improved version of the previous scouts, with the main visible difference being the new 'plough' bow changed to improve their seakeeping abilities. Two of the three were ordered under the 1910–1911 Naval Programme and the last in the following naval programme.〔Friedman 2009, pp. 111–13〕 Displacing , the ships had an overall length of , a beam of and a deep draught of . They were powered by two sets of Parsons steam turbines, each driving two shafts. The turbines produced a total of , using steam produced by 12 Yarrow boilers that burned both fuel oil and coal, and gave a maximum speed of . They carried a maximum of of coal and of fuel oil that gave them a range of at . Her crew consisted of 293 officers and enlisted men.〔Friedman 2009, p. 295〕 The main armament of the ''Active'' class consisted of ten breech-loading (BL) four-inch Mk VII guns. The forward pair of guns were mounted side by side on a platform on the forecastle, six were amidships, three on each broadside, and the two remaining guns were on the centreline of the quarterdeck, one ahead of the other.〔Gardiner & Gray, p. 50〕 The guns fired their shells to a range of about .〔Friedman 2011, pp. 75–76〕 Her secondary armament was four quick-firing (QF) s and two submerged 18-inch (450 mm) torpedo tubes. In 1918, two 4-inch guns were removed from ''Active'' and ''Fearless''. A QF three-inch 20 cwt〔"Cwt" is the abbreviation for hundredweight, 20 cwt referring to the weight of the gun.〕 anti-aircraft gun was added to ''Active'' in 1916; ''Fearless'' receiving her own two years later.〔Gardiner & Gray, p. 53〕 As scout cruisers, the ships were only lightly protected to maximize their speed. They had a curved protective deck that was thick on the slope and on the flat.〔 Their conning tower was protected by four inches of armour.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Active-class cruiser」の詳細全文を読む スポンサード リンク
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