Description
Jean Bart was 166 metres (544 ft 7 in) long overall. She had a beam of 27 metres (88 ft 7 in) and at full load a draft of 9.04 metres (29 ft 8 in) at the bow. She displaced 23,475 tonnes (23,100 long tons) at standard load and 25,579 tonnes (25,180 long tons) at full load. She proved to be rather wet in service as she was bow-heavy because of her superimposed turrets forward.
Jean Bart had four propellers powered by four Parsons direct-drive steam turbines, rated at 28,000 shaft horsepower (20,880 kW); twenty-four Belleville water-tube boilers provided steam for her turbines. These boilers were coal-burning with auxiliary oil sprayers. She had a designed speed of 21 knots (39 km/h; 24 mph). She carried up to 2,700 long tons (2,700 t) of coal and 906 long tons (921 t) of oil and could steam for 4,200 nautical miles (7,800 km) at a speed of 10 knots (12 mph; 19 km/h).
Jean Bart's main armament consisted of twelve 305-millimetre (12 in) Mle 1910 45-calibre guns mounted in six twin gun turrets, with two turrets superimposed fore and aft, and one on each flank of the ship. For anti-torpedo boat defence she carried twenty-two 138-millimetre (5.4 in) Mle 1910 guns, which were mounted in casemates. Four 47-millimetre (1.9 in) Modèle 1902 Hotchkiss guns were fitted, two on each beam. She was also armed with four 450-millimetre (18 in) submerged Modèle 1909 torpedo tubes with twelve torpedoes.
Jean Bart's waterline armoured belt extended well below the waterline as the French were concerned about protection from underwater hits. Her main armour was also thinner than that of her British or German counterparts, but covered more area. It was 270 millimetres (10.6 in) thick between the fore and aft turrets and tapered to 180 mm (7.1 in) towards the bow and stern. It extended 2.4 metres (7 ft 10 in) below the normal waterline. Above the main belt was another belt, 180 mm thick, that covered the sides, and the secondary armament, up to the forecastle deck, 4.5 metres (14 ft 9 in) deep, between the fore and aft turrets. The conning tower had armour 300 mm (11.8 in) thick. The main gun turrets had 290 millimetres (11.4 in) of armour on their faces, 250 millimetres (9.8 in) on their sides and roofs 100 millimetres (3.9 in) thick. Their barbettes had 280 millimetres (11.0 in) of armour. There was no anti-torpedo bulkhead although there was a longitudinal bulkhead abreast the machinery spaces that was used either as a coal bunker or left as a void.
Read more about this topic: French Battleship Jean Bart (1911)
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