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The ''Orca'' class is a class of eight steel-hulled Royal Canadian Navy training tenders. Based on the Australian-designed , the ''Orca'' class was constructed by Victoria Shipyards between November 2004 and November 2008, at a total project cost of C$90.7 million. All are in service at CFB Esquimalt in British Columbia. They replaced the YAG 300 class and operate as training platforms and surveillance craft. These ships are not commissioned and as such do not receive the prefix Her Majesty's Canadian Ship (HMCS). ==Design and construction== During the early 2000s, the Canadian Forces Maritime Command, (MARCOM) began searching for a replacement for the 1950s-era wooden-hulled YAG 300 class training tenders.〔 Training aboard these outdated vessels while useful, was less relevant as MARCOM moved the initial training of ship operators to modern land-based simulators that more accurately replicated the conditions aboard the Navy's capital ships. On 8 November 2004, the Department of National Defence announced a C$69.7 million contract for six new ships, with an option for two more, for a total budget of C$90.7 million. The ''Orca''-class ships are based on the Australian training vessel ''Seahorse Mercator'', itself a derivative of the Australian-designed .〔 Though the two designs share a geometrically similar hull shape, much about the ''Orca''-class design is different from its forebear. The ''Orca'' class has a 15% increase in hull displacement due to the requirement of the Royal Canadian Navy that the hull be able to withstand any increase in the size and weight of future equipment. This size change led to a change in the propulsion system, the system on ''Seahorse Mercator'' no longer providing the necessary speed. Other changes were made accommodation and wheelhouse structure.〔 This also predicated a need to change the electrical systems and the installation of a third generator. The requirements of the ''Canadian Shipping Act'' meant that the electrical supply would be changed to 120 Volts/60 Hertz and that the water cooling system had to be redesigned. The addition of a hardened point for the possible installation of heavier armament required strengthening the foredeck and improving the fire protection. The installation of a new firemain supply to the new ammunition storage lockers required the redesign of several systems, among them the auxiliary seawater and bilge systems.〔 Each ship has a displacement of 210 tonnes, is long,〔 has a beam of , and a draught of . To meet the training requirement, the ''Orca''s are fitted with a larger-than-normal bridge and carry warship-grade navigational equipment.〔 The ''Orca''s are capable of , and have an endurance of at .〔〔 Propulsion is provided by two Caterpillar 3516B marine diesel engines, each rated for 2,500 horsepower at 1,600 revolutions per minute.〔 Each ship can be operated by a crew of five.〔 Accommodation consists of two two-bunk cabins for the crew (Officer in Charge, Executive Officer, Bos'n, Engineer) two six bunk cabins and two four bunk cabins for 19 instructors and trainees〔 for a total of 24 bunks. The eight tenders were constructed by Victoria Shipyards at Victoria, British Columbia.〔 The first ship in the class, ''Orca'', was laid down in September 2005, launched in August 2006, and delivered to MARCOM in November 2006. Delivery of subsequent vessels was set to occur every three months.〔 The project was completed when the eighth vessel, ''Moose'', was delivered on 27 November 2008. The ''Orca''s are not commissioned into service, so do not carry the HMCS ship prefix; instead, the prefix PCT (Patrol Craft Training) is carried. 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「Orca-class patrol vessel」の詳細全文を読む スポンサード リンク
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