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The Type system is a classification system used by the British Royal Navy to classify surface escorts by function. The system evolved in the early 1950s, when the Royal Navy was experimenting with building single-purpose escort vessels with specific roles in light of experience gained in World War II. The original (July 1950) numbering scheme was: Type 1X were Anti-Submarine (ASW) Frigates (when the numbers ran out in the 1960s, ASW Frigates continued as the Type 2X series). Type 4X were Anti-Aircraft (AAW) Frigates (this later evolved into the "Destroyer" Type series). Type 6X were Aircraft-Direction (ADW) Frigates. Type 8X were Multi-Role ships. An Admiralty Fleet Order defined these ships as "Destroyers" if they could achieve "fleet speed" or as "Sloops" if they could not.〔ADM 167/135, Admiralty Board Minutes and Memoranda, quoted in Brown & Moore, p.73.〕 The following Type numbers are known to have been used, or proposed; ==Types 11-30, Anti-Submarine Frigates== * Type 11 : Diesel powered anti-submarine frigate based on hull of Type 41 / 61. Not built. * Type 12 ''Whitby'' : Steam powered, high-speed "first-rate" anti-submarine frigate. * Type 12M ''Rothesay'' : Modified Type 12 design. * Type 12I ''Leander'' : Improved Type 12, general purpose frigate. * Type 14 ''Blackwood'' : Steam powered, high-speed, "second-rate" anti-submarine frigate. * Type 15 : High-speed anti submarine frigate, full conversion of wartime destroyer hulls of the "R" class. * Type 16 : High-speed anti submarine frigate, limited conversion of wartime destroyer hulls of the "T", "O" and "P" classes. * Type 17 : "Third-rate" anti-submarine frigate, analogous to wartime corvettes. Design abandoned in 1953. Not built. * Type 18 : High-speed anti submarine frigate, intermediate conversion of wartime destroyer hulls of the "N", "S", "T" and "Z" classes (and intended to replace the Type 16. Design abandoned in 1953. Not built. * Type 19 : Very high speed (42 knot) gas turbine powered anti-submarine frigate. Design abandoned in 1965. Not built. * Type 21 ''Amazon'': General purpose, gas-turbine powered commercially designed frigate. * Type 22 ''Broadsword'' : Large, gas-turbine powered, anti-submarine frigates. * Type 23 ''Duke'' : Gas-turbine and diesel powered, anti-submarine frigates. Smaller and less expensive than the Type 22, with similar capabilities. 16 built. * Type 24 : Cheap frigate design ("Future Light Frigate") intended for export. In RN service would have served as a towed array ASW ship. Not built. * Type 25 : More capable development of the Type 24, designed to have almost the capability of a Type 22 but at only three-quarters of the cost. Much of the thinking, including the diesel-electric machinery, went into the Type 23. Not built. * Type 26 : Global Combat Ship : First announced in March 2010, and formerly known as the Future Surface Combatant. Initial orders placed in February 2014.〔MoD signs £859m Type 26 warship development deal - 20 Feb 15 - http://www.bbc.co.uk/news/uk-scotland-scotland-business-31554494 (accessed 4 Mar 15)〕 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「Type system of the Royal Navy」の詳細全文を読む スポンサード リンク
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