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Bulldog-class survey vessel
The ''Bulldog class'' was a four ship class of survey vessel in service with the Royal Navy from the late 1960s until the start of the 21st century. Initially designed with service overseas in mind, they spent most of their careers off the British coast. A fifth ship was subsequently built to a modified design to support them in their activities. Decommissioned and sold off at the end of the 20th and start of the 21st centuries, they have continued in service as civilian vessels, with some being converted to private yachts and others entering other commercial sectors.
==Design==
The ''Bulldog''s were designated as coastal survey vessels, and were a smaller variant of the earlier ''Hecla''-class designs. All four ships were built by Brooke Marine utilising merchant hulls.〔 The resulting design was stable in a variety of sea conditions, and the class was considered to be good seakeepers, with an all-welded construction, a bulbous bow and a high flared forecastle.〔 Anti-rolling tanks and twin rudders were also fitted. The ships used eight-cylinder Lister Blackstone diesel engines powering two variable-pitch propellers and were fitted with precise navaids, specialised echo-sounders, magnetometer and a variety of sonar and radar. Bulldog was retrospectively fitted with Marconi Hydrosearch sector scanning sonar. In addition they carried two small surveying boats(18 ft/35 ft), fitted with an array of equipment and capable of conducting surveys in shallow water.〔
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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