page_title: HMS Ocean (1898)
section_title: Design
hierarchical_section_title: HMS Ocean (1898) / Design
caption_attribution_description: Right elevation, deck plan and hull section depicting British Canopus class battleship. Top diagram (right elevation) shows armour thickness in inches. Bottom diagram (deck plan) shows gun sizes in inches.
context_page_description: The fourth HMS Ocean was a pre-dreadnought battleship of the British Royal Navy and a member of the Canopus class. Intended for service in Asia, Ocean and her sister ships were smaller and faster than the preceding Majestic-class battleships, but retained the same battery of four 12-inch guns. She also carried thinner armour, but incorporated new Krupp steel, which was more effective than the Harvey armour used in the Majestics. Ocean was laid down in December 1897, launched in July 1898, and commissioned into the fleet in February 1900.
  She entered service with the Mediterranean Fleet until January 1901, when she was transferred to the China Station. Ocean was recalled from China in 1905 for service with the Channel Fleet after a period spent in reserve. From 1908 to early 1910, she was again assigned to the Mediterranean Fleet. She was assigned to the Home Fleet in 1910 and saw little activity until the outbreak of the First World War in August 1914.
context_section_description: Ocean and her five sister ships were designed for service in East Asia, where the new rising power Japan was beginning to build a powerful navy, though this role was quickly made redundant by the Anglo-Japanese Alliance of 1902. The ships were designed to be smaller, lighter and faster than their predecessors, the Majestic-class battleships. Ocean was 421 feet 6 inches (128.47 m) long overall, with a beam of 74 ft (23 m) and a draft of 26 ft 2 in (7.98 m). She displaced 13,150 long tons (13,360 t) normally and up to 14,300 long tons (14,500 t) fully loaded. Her crew numbered 682 officers and ratings.
  The Canopus-class ships were powered by a pair of 3-cylinder triple-expansion engines, with steam provided by twenty Belleville boilers. They were the first British battleships with water-tube boilers, which generated more power at less expense in weight compared with the fire-tube boilers used in previous ships. The new boilers led to the adoption of fore-and-aft funnels, rather than the side-by-side funnel arrangement used in many previous British battleships. The Canopus-class ships proved to be good steamers, with a high speed for battleships of their time—18 knots (33 km/h; 21 mph) from 13,500 indicated horsepower (10,100 kW)—a full two knots faster than the Majestics.
  Ocean had a main battery of four 12-inch (305 mm) 35-calibre guns mounted in twin-gun turrets fore and aft; these guns were mounted in circular barbettes that allowed all-around loading, although at a fixed elevation. The ships also mounted a secondary battery of twelve 6-inch (152 mm) 40-calibre guns mounted in casemates, in addition to ten 12-pounder guns and six 3-pounder guns for defence against torpedo boats. As was customary for battleships of the period, she was also equipped with four 18-inch (460 mm) torpedo tubes submerged in the hull.
  To save weight, Ocean carried less armour than the Majestics—6 inches in the belt compared to 9 inches (229 mm)—although the change from Harvey armour in the Majestics to Krupp armour in Ocean meant that the loss in protection was not as great as it might have been, Krupp armour having greater protective value at a given weight than its Harvey equivalent. Similarly, the other armour used to protect the ship could also be thinner; the bulkheads on either end of the belt were 6 to 10 inches (152 to 254 mm) thick. The main battery turrets were 10 in thick, atop 12-inch barbettes, and the casemate battery was protected with 6 in of Krupp steel. Her conning tower had 12 in thick sides as well. She was fitted with two armoured decks, 1 and 2 inches (25 and 51 mm) thick, respectively.
caption: Right elevation, deck plan and hull section as depicted in Brassey's Naval Annual 1906
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