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The ''Delhi''-class destroyers are guided-missile destroyers of the Indian Navy. Three ships of this class are in active service.〔 The ''Delhi''-class vessels are the third-largest warships to be fully designed and built in India, after the s and the s. They were built at Mazagon Dock Limited in Mumbai. ==Development== The development of the ship began as "Project 15" in 1977. The ships were designed indigenously and built by Mazagon Docks Limited (MDL) at a cost of Rs 7 Billion each. The ''Delhi'' class has both Soviet and Western design influences, incorporating elements of the , and ''Kashin-II''-class destroyers, and the frigate. These vessels are fully fitted with flag facilities. The ''Delhi'' class is also capable of operating in a NBC environment. Radar cross-section reduction is presumed to be minimal, to the extent that some sharp angles have been flattened. In the main air defence role, a pair of 2 3S-90 launchers – one installed forward of the bridge and the other atop the dual helicopter hangar – are fitted with the Shtil SAM system. The Shtil system consists of the Russian Shtil missile and 24 such missiles are carried in a below-decks magazine. The launchers elevate up to 70° but have a limited firing arc of 30° within the centreline. The launcher groups require a crew of 20 men and weigh about 50 tons. The ''Delhi'' class is being upgraded with the Rafael Barak 1 point air defence missile system, which overcomes the limited firing arc of the Shtil system. It has an eight-cell vertical launch system and the missile command-to-line-of-sight (CLOS) radar guidance with a range from to . The missile's maximum range is . The ship has a surveillance capacity of over and can sterilise an area of . The ships also have a quadruple 533mm torpedo launcher, which can also be used to launch SS-N-15 'Starfish' or possibly SS-N-16 'Stallion' ASW missiles, so is capable of hitting targets ranging from to . It is also equipped with two RBU-6000 anti-submarine rocket launchers with 12 tubes. Their range is and the maximum engagement depth is . Each ship can support two helicopters, the Sea King or the HAL Dhruv. The Sea King helicopters are equipped with a Super Searcher radar and primarily used in air surveillance and anti-submarine roles. The helicopters are capable of flying four and half hours non-stop. The HAL Dhruv helicopters are primarily for utility roles. INS ''Delhi'' has a crew of approximately 30 officers and 350 sailors. The ships are equipped with four chaff launch systems and the BEL Ajanta radar interceptor. The TQN-2 jamming system is supplied by the Italian company, Elettronica. The ship's hull mounted active search sonar capability is based on the TSM2633 by Thales Underwater Systems or the APSOH by Bharat. The ''Delhi'' class also has a variable depth sonar (VDS), Model 15-750 designed by Fathom Oceanology of Mississauga, Canada with a fish on of faired cable. The first VDS handling system was built by Fathom and the fish utilized a Westinghouse low frequency sonar. Fathom was acquired by Indal Canada which established subsequent manufacture of VDS handling systems by Indal and Garden Reach of India. 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「Delhi-class destroyer」の詳細全文を読む スポンサード リンク
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