Design
Gangut was 180 meters (590 ft) long at the waterline and 181.2 meters (594 ft) long overall. She had a beam of 26.9 meters (88 ft) and a draft of 8.99 meters (29.5 ft), 49 centimeters (1.61 ft) more than designed. Her displacement was 24,800 tonnes (24,400 long tons; 27,300 short tons) at load, over 1,500 t (1,500 long tons; 1,700 short tons) more than her designed displacement of 23,288 t (22,920 long tons; 25,671 short tons).
Gangut's machinery was built by the Franco-Russian Works. Ten Parsons-type steam turbines drove the four propellers. The engine rooms were located between turrets three and four in three transverse compartments. The outer compartments each had a high-pressure ahead and reverse turbine for each wing propeller shaft. The central engine room had two each low-pressure ahead and astern turbines as well as two cruising turbines driving the two center shafts. The engines had a total designed output of 42,000 shaft horsepower (31,319 kW), but they produced 52,000 shp (38,776 kW) during her sister Poltava's full-speed trials on 21 November 1915 and gave a top speed of 24.1 knots (44.6 km/h; 27.7 mph). Twenty-five Yarrow Admiralty-type small-tube boilers provided steam to the engines at a designed working pressure of 17.5 standard atmospheres (1,770 kPa; 257 psi). Each boiler was fitted with Thornycroft oil sprayers for mixed oil/coal burning. They were arranged in two groups. The forward group consisted of two boiler rooms in front of the second turret, the foremost of which had three boilers while the second one had six. The rear group was between the second and third turrets and comprised two compartments, each with eight boilers. At full load she carried 1,847.5 long tons (1,877.1 t) of coal and 700 long tons (710 t) of fuel oil and that provided her a range of 3,500 nautical miles (6,500 km) at a speed of 10 knots (19 km/h).
Her main armament consisted of a dozen Obukhovskii 12-inch (305 mm) Pattern 1907 52-caliber guns mounted in four triple turrets distributed the length of the ship. The Russians did not believe that superfiring turrets offered any advantage, discounting the value of axial fire and believing that superfiring turrets could not fire while over the lower turret because of muzzle blast problems. They also believed that distributing the turrets, and their associated magazines, over the length of the ship improved the survivability of the ship. Sixteen 4.7-inch (119 mm) 50-caliber Pattern 1905 guns were mounted in casemates as the secondary battery intended to defend the ship against torpedo boats. She completed with only a single 3-inch (76 mm) 30-caliber Lender anti-aircraft (AA) gun mounted on the quarterdeck. Other AA guns were probably added during the course of World War I, but details are lacking. Conway's says that four 75-millimeter (3.0 in) were added to the roofs of the end turrets during the war. Four 17.7-inch (450 mm) submerged torpedo tubes were mounted with three torpedoes for each tube.
Read more about this topic: Russian Battleship Gangut (1911)
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