Editing HMS Hurst Castle (section)

==Design and description==
The Castle-class corvette was a stretched version of the preceding [[Flower-class corvette|Flower class]], enlarged to improve [[seakeeping]] and to accommodate modern weapons. The ships [[Displacement (ship)|displaced]] {{convert|1010|LT|t|lk=on}} at [[Displacement (ship)|standard]] load and {{convert|1510|LT|t}} at [[deep load]]. They had an [[length overall|overall length]] of {{convert|252|ft|m|1}}, a [[beam (nautical)|beam]] of {{convert|36|ft|9|in|m|1}} and a deep [[draft (hull)|draught]] of {{convert|14|ft|m|1}}. They were powered by a pair of [[Marine steam engine#Triple or multiple expansion|triple-expansion steam engines]], each driving one [[propeller shaft]] using steam provided by two [[Admiralty three-drum boiler]]s. The engines developed a total of {{convert|2880|ihp|lk=on}} and gave a maximum speed of {{convert|16.5|kn|lk=in}}. The ''Castle''s carried enough [[fuel oil]] to give them a range of {{convert|6500|nmi|lk=in}} at {{convert|15|kn}}. The ships' complement was 99 officers and [[Naval rating|ratings]].<ref>Lenton, p. 297</ref>

The Castle-class ships were equipped with a single [[QF 4 inch Mk XVI naval gun|QF {{convert|4|in|mm|adj=on|0}} Mk XVI gun]] forward, but their primary weapon was their single three-barrel [[Squid (weapon)|Squid]] [[anti-submarine mortar]]. This was backed up by one [[depth charge]] rail and two throwers for 15 depth charges. The ships were fitted with two twin and a pair of single mounts for [[Oerlikon 20 mm cannon|{{convert|20|mm|1|adj=on}} Oerlikon]] light [[AA gun]]s.<ref>Chesneau, p. 63; Lenton, p. 297</ref> Provision was made for a further four single mounts if needed. They were equipped with Type 145Q and Type 147B [[ASDIC]] sets to detect submarines by reflections from sound waves beamed into the water. A [[Type 277 radar|Type 277]] [[search radar]] and a [[HF/DF]] [[radio direction finder]] rounded out the Castles' sensor suite.<ref>Goodwin, p. 3</ref>