HMS Implacable was a Formidable-class battleship of the British Royal Navy, constructed at Devonport Dockyard. Laid down in July 1898 and launched in March 1899, she was completed by July 1901. The ship measured approximately 431 feet 9 inches (131.60 meters) in overall length, with a beam of 75 feet (22.9 meters) and a draught of 25 feet 11 inches (7.90 meters). She displaced around 14,500 long tons (14,700 tonnes) normally, with a full load displacement of up to 15,800 long tons (16,100 tonnes). Her crew numbered about 780 officers and ratings. Implacable's design was an evolution of earlier British battleships, featuring a main battery of four 12-inch (305 mm) 40-calibre guns housed in twin turrets fore and aft, capable of circular loading and elevation. Her secondary armament included twelve 6-inch (152 mm) guns in casemates, along with smaller 12-pounder and 3-pounder guns for defense against torpedo boats. She was also equipped with four submerged 18-inch (457 mm) torpedo tubes. Her armor protection was substantial, with an 9-inch (229 mm) thick belt, 8 to 10-inch (203–254 mm) main battery turret sides, and a conning tower with 14-inch (356 mm) thick sides. Powered by twin triple-expansion engines and twenty Belleville boilers, Implacable could reach a top speed of approximately 18 knots (33 km/h). Her hull featured an improved form over previous classes, and her armament and armor reflected advancements aimed at enhancing protection and firepower. Throughout her service, Implacable was assigned to various fleets, including the Mediterranean Fleet, Channel Fleet, and Atlantic Fleet. During World War I, she participated notably in the Dardanelles Campaign, supporting landings at Cape Helles and bombarding Ottoman defenses. She also served in the Adriatic Sea and the Aegean, reinforcing Allied operations in these regions. After her active combat role, she was converted into a depot ship for the Northern Patrol in 1918. Decommissioned shortly after the war, she was sold for scrap in 1921, ending her career as a significant example of pre-dreadnought design adapted for wartime service.

This description has been generated using GPT-4.1-NANO based on the Vessel's wikidata information and then modified by ShipIndex.org staff.