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Oblique icebreaker
An oblique icebreaker is a special type of icebreaker designed to operate not only ahead and astern, but also obliquely (sideways) with a large angle of attack. In this way, a relatively small icebreaker is capable of opening a wide channel in ice for large merchant ships.
The oblique icebreaker concept was developed in the late 1990s by Kværner Masa-Yards Arctic Technology Centre (MARC), the Finnish engineering company also responsible for the development of the double acting ships. The first vessel of this kind was ordered by the Russian Ministry of Transport on 8 December 2011 and was completed in 2014.
== Development ==
The development of the oblique icebreaker concept began in 1997, when Kværner Masa-Yards Arctic Technology Centre (MARC) established a project to develop new ways of assisting large tankers in ice conditions. Traditionally, escorting large ships up to wide required two conventional icebreakers with a beam of , a practice that was not very efficient and economical. Analysis of Finnish harbour statistics and icebreaker logbooks showed that with a beam of , the icebreaker would be wide enough to provide assistance to most merchant ships in need of towing. The larger ships, fewer in number, could then be assisted with an unconventional method. The result was an asymmetrical, triangle-shaped vessel with three azimuth thrusters in the "corners" pushing the icebreaker with a 50-degree angle of attack — almost sideways — in ice. Model tests in an ice tank showed that the proposed concept was viable and that the resistance of a large cargo ship was considerably reduced in both level ice as well as frozen brash ice when operating behind the oblique icebreaker.〔(The Oblique Icebreaker ). ABS Surveyor Summer 2005, page 15. 〕 The concept has been patented.〔Arpiainen, M. et al. (1999): (Icebreaking method and icebreaker ). United States Patent no. 5,996,520. 〕
Over the years, the concept was further developed by MARC and its successor, Aker Arctic, together with ABB and the Finnish Funding Agency for Technology and Innovation (Tekes). In addition to icebreaking, the oblique vessel could also be utilized for oil spill response operations in both open and ice-infested waters by using the flat side to guide the oil to a recovery unit.〔〔(Vino jäänmurtaja kulkee kylki edellä ). Tekniikka & Talous, 30 October 2003. 〕 However, there have also been doubts about the ability of the relatively small vessel to break a wide channel in ice without the much greater displacement and shaft power of a traditional icebreaker.〔Kauhanen, E. (2003): (Jäät päreiksi, sitten kesätöihin ). Tiede 7/2003. 〕
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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