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HMS ''Afridi'' was a Tribal class destroyer of the Royal Navy launched in 1907 and sold for scrap in 1919. During the First World War she served in the North Sea and the English Channel with the 6th Destroyer Flotilla and as part of the Dover Patrol. It is assumed - though never definitely confirmed - that explosive sweeps deployed by the ''Afridi'' were responsible for the destruction of the German U-Boat ''UB-13'', which on 23 April 1916 departed Zeebrugge for a patrol off the mouth of the Thames and was never heard from again. ==Construction and design== HMS ''Afridi'' was ordered from Armstrong Whitworth in September 1905,〔Brook, 1999, p. 176.〕 one of five ''Tribal''-class destroyers ordered for the Royal Navy as part of the 1905–06 shipbuilding programme.〔Friedman 2009, p. 108.〕 Design of the ships was left to the builders, with the Admiralty only laying down loose requirements, although the builder's designs did need to be approved by the Director of Naval Construction before orders were placed. The destroyers were required to reach , and have a range of at cruising speed and an endurance of eight hours at full speed. The ships were required to be powered by steam turbines, with cruising turbines fitted to improve range, fed by oil-fired boilers. Freeboard was to be at least at the ship's bow. Armament was two be three 12-pounder (3 inch, 76 mm) guns, with the older 12 cwt gun chosen to save money, and two 18 in (450 mm) torpedo tubes.〔Friedman 2009, pp. 106–108.〕〔Gardiner and Gray 1985, p. 72.〕 It was realised during construction that the armament of the Tribals was too light, with the two ships ordered as part of the 1906–07 programme being armed with two 4 inch (102 mm) guns. In October 1908, it was decided to strengthen the armament of the first five Tribals, including ''Afridi'', by adding another two 12-pounder guns. This was done to ''Afridi'' prior to acceptance by the Royal Navy.〔Friedman 2009, pp. 109–110.〕 Armstrong's design used five Yarrow water-tube boilers to feed steam turbines supplied by the Parsons Marine Steam Turbine Company rated at . These drove three propeller shafts, with one propeller per shaft. Three short funnels were fitted. The two forward 12-pounder guns were mounted side-by-side on the ship's forecastle, with the third gun aft. Two spare torpedoes were carried.〔Brook 1999, p. 175.〕〔Friedman 2009, p. 100.〕 ''Afridi'' was laid down at Armstrong's Elswick shipyard in August 1906 and was launched on 8 May 1907.〔〔 The ship's trials were troublesome, with propeller and turbine problems being encountered, with poor weather and industrial action causing delays. She finally met her contract speed during February 1909, when a speed of was reached,〔 although this required forcing the ship's engines to give .〔 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「HMS Afridi (1907)」の詳細全文を読む スポンサード リンク
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