Editing HMS Duncan (D99) (section)

==Design and construction==
''Duncan'' displaced {{convert|1400|LT|t}} at [[Displacement (ship)|standard]] load. The ship had an [[length overall|overall length]] of {{convert|329|ft|m|1}}, a [[beam (nautical)|beam]] of {{convert|33|ft|m|1}} and a [[draft (hull)|draught]] of {{convert|12|ft|6|in|m|1}}. She was powered by [[Parsons Marine Steam Turbine Company|Parsons]] geared [[steam turbine]]s, driving two shafts, which developed a total of {{convert|36000|shp|lk=in}} and gave a maximum speed of {{convert|36|kn|lk=in}}. Steam for the turbines was provided by three [[Admiralty 3-drum boiler]]s. ''Duncan'' carried a maximum of {{convert|390|LT|t}} of [[fuel oil]] that gave her a range of {{convert|5870|nmi|lk=in}} at {{convert|15|kn}}. The ship's complement was 175 officers and men.<ref name=w78>Whitley, p. 101</ref>

The ship mounted four 45-[[caliber (artillery)|calibre]] [[QF 4.7-inch Mk IX & XII naval gun|4.7-inch Mk IX guns]] in single mounts designated 'A', 'B', 'X' and 'Y' from front to rear. For [[Anti-aircraft warfare|anti-aircraft]] (AA) defence, ''Duncan'' had a single 12-pounder AA gun between her [[funnel (ship)|funnel]]s and two quadruple Mark I mounts for the [[Vickers .50 machine gun|QF 0.5-inch Vickers Mark III]] machine guns mounted on the sides of her [[bridge (nautical)|bridge]]. She was fitted with two above-water quadruple [[torpedo tube]] mounts for [[British 21-inch torpedo|21-inch torpedoes]].<ref name=w78/> One [[depth charge]] rail and two throwers were fitted; 20 depth charges were originally carried, but this increased to 35 shortly after the war began.<ref>English, p. 141</ref> In 1936, the 12-pounder was replaced by two [[QF 2-pounder naval gun|QF 2-pounder Mk II]] AA guns. Sometime after the [[Dunkirk evacuation]], the ship's rear torpedo tube mount was removed and replaced by a 12-pounder AA gun and the quadruple 0.5-inch machine guns were replaced by {{convert|20|mm|adj=on}} [[Oerlikon 20 mm cannon|Oerlikon AA guns]].<ref>Lenton, pp. 155–56</ref>

''Duncan'' was ordered under the 1930 Naval Estimates on 2 February 1931 from [[Portsmouth Dockyard]]. She was laid down on 25 September 1931, launched on 7 July 1932 and finally commissioned into the Navy on 31 March 1933. Built as a [[flotilla leader]], she displaced 25 long tons more than the rest of her class and carried an extra 30 personnel. These personnel formed the staff of the [[Captain (D)]] of the flotilla.<ref>English, p. 51</ref>