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The ''Leander''-class, or Type 12I frigates,〔(Postwar Frigates )〕 comprising twenty-six vessels, was among the most numerous and long-lived classes of frigate in the Royal Navy's modern history. The class was built in three batches between 1959 and 1973. It had an unusually high public profile, due to the popular BBC television drama series ''Warship''. The Leander silhouette became synonymous with the Royal Navy through the 1960s until the 1980s. Only two Leander Class Frigates survive today, serving in the Ecuadorian Navy as of February 2015. The ''Leander'' design or derivatives of it were built for other navies: *Royal New Zealand Navy as the ''Leander'' class *Chilean Navy: ''Condell'' class *Royal Australian Navy: River class *Indian Navy: ''Nilgiri'' class *Royal Netherlands Navy: ''Van Speijk'' class ==Design== On 7 March 1960, the Civil Lord of the Admiralty C. Ian Orr-Ewing stated that the "Type 12 ''Whitby''-class anti-submarine frigates are proving particularly successful ... and we have decided to exploit their good qualities in an improved and more versatile ship. This improved Type 12 will be known as the ''Leander'' class. The hull and steam turbine machinery will be substantially the same as for the ''Whitbys''. The main new features planned are a long-range air warning radar, the ''Seacat'' anti-aircraft guided missile, improved anti-submarine detection equipment and a light-weight helicopter armed with homing torpedoes. We shall also introduce air conditioning and better living conditions."〔(Hansard HC Deb 07 March 1960 vol 619 cc39-200 ) Navy Estimates 1960–61, statement by the Civil Lord of the Admiralty (Mr. C. Ian Orr-Ewing), 7 March 1960.〕 The 1963 edition of ''Jane's Fighting Ships'' described it as a "mainly anti-submarine but flexible and all purpose type".〔 "The ''Leander'' class have the same hull and substantially the same steam turbine machinery as the ''Whitby'' class, but are a revised and advanced design and will fulfil a composite anti-submarine, anti-aircraft and air direction role. The 40mm guns will eventually be replaced by ''Seacat'' ship-to-air launchers. The ships are equipped with VDS (Variable Depth Sonar), formerly known as dipping asdic."〔 The Y160 boiler variant used on the Batch 3 ''Leander''s (such as ''Jupiter'') also incorporated steam atomisation equipment on the fuel supply so the diesel fuel entering the boilers ''via'' the three main burners was atomised into a fine spray for better flame efficiency. Some ships with Y100 Boilers were also converted to steam atomisation, HMS ''Cleopatra'' being one of them. The superheat temperature of the Y160 was controlled manually by the boiler room petty officer of the watch between and the steam supplied to the main turbines was at a pressure of . The ''Leander''-class frigates did have Babcock and Wilcox boilers but of a more conventional two-drum design, one water drum and one steam drum, much like a Yarrow boiler without the second water drum. The water drum was offset to one side and below the furnace and steam drum. The two boilers fitted were 'handed' with the water drum inboard on both. Many ''Leander''s had six burner furnaces (known as Five and a Half Boilers) and the output was varied by altering the number of burners in use. 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「Leander-class frigate」の詳細全文を読む スポンサード リンク
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