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The P class, nominally described as "patrol boats", was in effect a class of coastal sloops. Twenty-four ships to this design were ordered in May 1915 (numbered ''P.11'' to ''P.34'') and another thirty between February and June 1916 (numbered ''P.35'' to ''P.64'') under the Emergency War Programme〔(P boats of the First World War – William Bartram and P23 | Tyne & Wear Archives & Museums Blog )〕 for the Royal Navy in the First World War, although ten of the latter group were in December 1916 altered on the stocks before launch for use as decoy Q-ships and were renumbered as PC-class sloops. None were named, although in 1925 ''P.38'' was given the name ''Spey''. These vessels were designed to replace destroyers in coastal operations, but had twin screws, a very low freeboard, ram bows of hardened steel, a sharply cutaway funnel and a small turning circle. Clearly seen as the linear descendants of the late 19th century steam torpedo boats and coastal destroyers, many were actually fitted with the 14 in torpedo tubes removed from old torpedo boats. With the survival of a builder's diary by William Bartram, full details of the sea trials of ''P.23'' on 21 June 1916 exist. She worked up to . Bartram's commissioned a model from Sunderland model maker C Crawford & Sons and this model, in the collections of Sunderland Museum and Heritage Service, is stored in the model store of Tyne & Wear Archives & Museums Service at the Discovery Museum. ==PC class sloops== Ten of these ships were completed as Q-ships, with their numbers being altered by the addition of a "C" after the "P". These were termed the PC class sloops. A further batch of ten ships were ordered in 1917 (''PC.65'' to ''PC.70'' in January, and ''PC.71'' to ''PC.74'' in June) as PC class sloops. These were built to resemble small merchant vessels for use as decoy (Q) ships, and were alternatively known as "PQ" boats. Again, none were named, although in 1925 ''PC.73'' was given the name ''Dart'', while ''PC.55'' and ''PC.69'' were named ''Baluchi'' and ''Pathan'' respectively upon transfer to the Royal Indian Navy in May 1922. The PC-class sloops were completed with slight enlargement from the standard P-class sloops. They were 247 ft (overall) long and 25½ ft in breadth, although they had similar machinery. Displacement varied from 682 tons in ''PC.42'', ''PC.43'', ''PC.44'', ''PC.51'', ''PC.55'' and ''PC.56 '' to 694 tons in ''PC.60'' to ''PC.63'' and in ''PC.65'' to ''PC.74''. They carried one 4-inch and two 12-pounder guns, and no torpedo tubes. 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「P-class sloop」の詳細全文を読む スポンサード リンク
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