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Tribal-class frigate
The Type 81, or Tribal class, were ordered and built as Sloops 〔 N.Freidman.British Destroyers & Frigates. The Second World War & After. Seaforth, UK(2006),p 242 〕 to carry out similar duties to the immediate post war Improved Black Swan Sloops and Loch class frigates in the Gulf. In the mid 1960s the seven Tribals were reclassified as second class general-purpose frigates for the same reasons as the 21C reclassification of the USN Littoral Combat ships, to maintain frigate numbers. After the British withdrawal from East of Suez in 1971 the Tribals operated in the Nato North Atlantic sphere with the only update the fitting of Seacat missiles to all by 1977, 〔,Freidman. British Destroyers & Frigates. UK (2006),p247 〕 limited by their single screw and low speed of 24 knots. In 1979-80 age and crew and fuel shortages, saw them transferred to the stand by squadrons, three being reactivated in 1982 in the Falklands crisis for training and West Indian guardship duties.
==History==
The Tribals were designed during the 1950s as a response to the increasing cost of single-role vessels such as the Type 14s. They were first such 'multi role' vessels for the Royal Navy. They were designed specifically with colonial 'gunboat' duties in mind, particularly in the Middle East. They were therefore designed to be self-contained warships with weapon and sensor systems to cover many possible engagements, air conditioning to allow extended tropical deployment and such 'modern' habitability features as all bunk accommodation (as opposed to hammocks). The fitting of gas turbine boost engines was specifically intended to allow the frigates to almostly instantly leave ports and naval bases in the event of nuclear war, rather than have to spend four to six hours to flash up the steam boilers. The G6 gas turbine proved reliable and was generally used to leave port during the frigates career and paved the way for gas turbine propulsion to become universal in the RN within 30 years.
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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