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The Russian ironclad ''Petropavlovsk'' ((ロシア語:Петропавловск)) was ordered as a 58-gun wooden frigate by the Imperial Russian Navy in the early 1860s, but was converted while under construction into an 22-gun armored frigate. She served as the flagship of the Baltic Fleet during the 1860s and 1870s. The ship was decommissioned in 1885, but was not sold for scrap until 1892. ==Description== ''Petropavlovsk'' was long between perpendiculars, with a beam of and a draft of (forward) and (aft). She displaced and was fitted with a blunt iron ram at her bow.〔Gardiner, p. 173〕 ''Petropavlovsk'' was considered to be seaworthy; her total crew numbered 680 officers and enlisted men.〔''Russian Ironclad Frigates Sevastopol and Petropavlovsk'', p. 415〕 The ship was fitted with a horizontal return-connecting-rod steam engine〔 built by the Baird Works of Saint Petersburg.〔 It drove a single four-bladed propeller using steam that was provided by an unknown number of rectangular boilers.〔 During the ship's sea trials, the engine produced a total of and gave the ship a maximum speed of . The ship carried a maximum of of coal, but her endurance is unknown.〔Tredea & Sozea, p. 414〕 She was ship rigged with three masts.〔 As a heavy frigate, ''Petropavlovsk'' was intended to be armed with 54 of the most powerful guns available to the Russians, the 60-pounder smoothbore gun, and four long 36-pounder smoothbores. Her armament was revised when she was converted to an ironclad and she was completed with an armament of twenty rifled guns and two 60-pounder guns; all of the 8-inch guns were located on the lower deck and the 60-pounders were mounted on the upper deck as chase guns. Later another pair of 60-pounder guns were added on the upper deck. In 1877, the armament on her upper deck was changed and consisted of one 8-inch, one and ten rifled guns.〔 The entire ship's side was protected with wrought-iron armor〔 that extended below the waterline.〔Watts, p. 67〕 It was thick amidships, backed by of teak, that reduced to , backed by six inches of teak, in steps beginning from the ship's ends.〔 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「Russian ironclad Petropavlovsk」の詳細全文を読む スポンサード リンク
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