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The , also called the , was a ship class of two large armoured cruisers built for the Imperial Japanese Navy after the Russo-Japanese War of 1904–1905. These ships reflected Japanese experiences during that war as they were designed to fight side-by-side with battleships and were given an armament equal to, or superior to existing Japanese battleships. The development of the battlecruiser the year before was completed made her and her sister ship obsolete before they were completed because the foreign battlecruisers were much more heavily armed and faster. Both ships played a small role in World War I as they unsuccessfully hunted for the German East Asia Squadron and the commerce-raider and protected troop convoys in the Pacific Ocean shortly after the war began. The ships were sold for scrap in 1923 in accordance with the terms of the Washington Naval Treaty. ==Design and description== The ''Ibuki''-class ships were originally ordered during the Russo-Japanese War, on 31 January 1905, as armored cruisers. Before construction began, however, they were redesigned to incorporate guns in four twin turrets rather than the dozen guns in single mounts of the earlier ships. This required a larger hull to fit the turrets and thus more power from additional boilers to keep the same speed as the ''Tsukuba''-class ships.〔Itani, Lengerer & Rehm-Takahara, p. 60〕 These ships were given battleship-grade armament to overpower existing armored cruisers and were intended to fight in the battleline with battleships, much as had the two armored cruisers had done in the Battles of the Yellow Sea and Tsushima during the Russo-Japanese War. While more powerful than existing armored cruisers, the appearance of the British in 1908 with their armament of eight guns and speed of rendered these ships obsolete before they were commissioned.〔Itani, Lengerer & Rehm-Takahara, pp. 55, 60〕 They were reclassified as battlecruisers in 1912.〔Preston, p. 194〕 The ships had an overall length of and a length between perpendiculars of , a beam of , and a normal draught of . They displaced at normal load and at full load, roughly more than the earlier ships.〔Itani, Lengerer & Rehm-Takahara, p. 54〕 The crew numbered about 845 officers and enlisted men.〔Jentschura, Jung & Mickel, p. 78〕 They had a metacentric height of .〔Itani, Lengerer & Rehm-Takahara, p. 57〕 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「Ibuki-class armored cruiser」の詳細全文を読む スポンサード リンク
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