Editing Formidable-class battleship (section)

===General characteristics and machinery===
The ships of the ''Formidable'' class were {{convert|400|ft|0}} [[length between perpendiculars|long between perpendiculars]], {{convert|411|ft|abbr=on|0}} [[length at the waterline|long at the waterline]], and {{convert|431|ft|9|in|0}} [[length overall|long overall]]. They had a [[beam (nautical)|beam]] of {{convert|75|ft|abbr=on|0}} and a [[draft (hull)|draft]] of {{convert|26|ft|abbr=on|0}} normally and {{convert|28|ft|8|in|abbr=on|0}} fully loaded. The three ships displaced between {{convert|14480|to|14720|LT}} normally and up to {{convert|15805|to|15930|LT}} fully loaded. [[Freeboard (nautical)|Freeboard]] was {{convert|23|ft|abbr=on}} forward, {{convert|16|ft|9|in|abbr=on}} [[amidships]], and {{convert|18|ft|abbr=on}} aft.{{sfn|Lyon & Roberts|p=36}}{{sfn|Burt|p=191}}

They had two pole masts fitted with [[fighting top]]s; each top carried a [[searchlight]], and four additional searchlights were mounted on the forward and aft [[Bridge (nautical)|bridges]]. Their crew size varied over the course of their careers; ''Irresistible'' had a crew of 788&nbsp;officers and [[Naval rating|ratings]] in 1901, and in 1910, ''Formidable'' had a crew of 711. After having been withdrawn from active service in 1917, ''Implacable'' had a crew of just 361. The ships carried a number of small boats that varied over the course of their careers, including a variety of steam and sail [[Pinnace (ship's boat)|pinnaces]], sail [[Launch (boat)|launches]], [[Cutter (boat)|cutters]], [[galley]]s, [[whaler]]s, three [[Captain's gig|gigs]], [[dinghy|dinghies]], and [[raft]]s.{{sfn|Lyon & Roberts|p=36}}{{sfn|Burt|p=191}}

The ''Formidable''-class ships were powered by a pair of 3-cylinder [[triple-expansion engine]]s that drove two inward-turning [[propeller|screws]], with steam provided by twenty [[Belleville boiler]]s. The boilers were divided into three [[fire room|boiler rooms]] and were trunked into two [[funnel (ship)|funnels]] located amidships. The boilers proved to be troublesome in service, with all three members of the class experiencing problems with them, particularly as the ships aged, between 1909 and 1914. The ''Formidable''-class ships were rated for a top speed of {{convert|18|kn}} from {{convert|15000|ihp|lk=in}}. The ships' normally carried {{convert|900|t|abbr=on}} of coal for the boilers, but had a total capacity of {{convert|1920|to|2000|t|abbr=on}}, which provided a cruising range of {{convert|5100|nmi|abbr=on}} at a cruising speed of {{convert|10|kn}}.{{sfn|Lyon & Roberts|p=36}}{{sfn|Burt|pp=191, 196}}