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Project 21900 and 21900M icebreakers, also referred as LK-16, are a series of five Russian icebreakers. Two project 21900 icebreakers (''Moskva'' and ''Sankt-Peterburg'') were built at Baltic Shipyard in Saint Petersburg in 2008 and three project 21900M icebreakers are currently under construction, two at Vyborg Shipyard in Vyborg and one at Arctech Helsinki Shipyard in Helsinki. Two of the new vessels (''Vladivostok'' and ''Murmansk'') are expected to enter service in 2015 and the last one (''Novorossiysk'') in 2016. The construction of the 21900M class icebreakers are conducted under the Federal Target Programme "Development of the Transport System of Russia (2010 – 2015)".〔(【引用サイトリンク】title=Lead Icebreaker of 21900 Project Hits the Water )〕 The 21900M class vessels will measure 119.8 m in length and 27.5 m in breadth. The 21900M class icebreakers are double decker equipped with a helideck, having about 10 000 t displacement. The four main diesel generator sets have the total power of 27 MW. The total propulsion power is 17.4 MW consisting of two full-circle azimuth thrusters.〔(【引用サイトリンク】title=Icebreaker Murmansk for the Russian Ministry of Transport launched today at Arctech Helsinki Shipyard )〕 The main tasks of the project 21900/21900M class vessels are icebreaking and assisting of heavy-tonnage vessels in ice, towing of vessels and other floating structures both in ice and in open water. The vessels will also be used for fire fighting on floating objects and other facilities, assisting vessels in distress in ice and open water and cargo transportation. 〔(【引用サイトリンク】title=Construction Starts on the 3rd Icebreaker of Project 21900M )〕 According to Sergey Shishkin, head of RS Classification Division, the new project 21900M class ships features an improved design when compared to the older project 21900 class icebreakers. The newer project 21900М vessels have higher performance characteristics taking into consideration the service experience of previous icebreaker projects when ensuring icebreaker escort during winter navigation in the Gulf of Finland.〔 Project 21900M has been classified by the Russian Maritime Register of Shipping (RMRS) as the ice class, ''Icebreaker6''. The maximum icebreaking capability of 21900/21900M class vessels is 1.5 m. The vessels are intended for the Baltic Sea and the Northern Sea Route along the Russian Arctic coast. == List of project 21900/21900M icebreakers == ==Notes== 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「Project 21900 icebreaker」の詳細全文を読む スポンサード リンク
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