Kawachi-class battleship

1915 The Kawachi class was ordered on 22 June 1907 under the 1907 Warship Supplement Program after the Russo-Japanese War as Japan's first dreadnoughts, although their construction was delayed by a severe depression. Their design was based on the with a uniform main-gun armament in the hexagonal layout used by the German dreadnoughts of the and es. The first iteration of the design had six twin-gun turrets, with two pairs of superfiring turrets fore and aft of the superstructure and the two other turrets amidships "en echelon" to maximize end-on fire. This layout was rejected as it exceeded the informal limit. The design was then revised with the turrets in the hexagonal layout using the same 45-caliber 12-inch guns used in the preceding battleships. In early 1908, the IJN received reports that the Royal Navy's latest battleships used longer 50-caliber guns. The Chief of the Naval General Staff, Admiral Tōgō Heihachirō, pushed to use these guns; cost considerations prevented all the guns from having the same barrel length, so they were used only in the fore and aft turrets. ==Description==

The two ships had different bow designs for comparison purposes; Settsus clipper bow was longer than Kawachis vertical stem. Otherwise the two ships were externally virtually identical. The ships had an overall length of , a beam of , and a normal draft of . They displaced at normal load and had a metacentric height of . Their crew ranged from 999 to 1100 officers and enlisted men. The turbines were rated at a total of for a design speed of . The ships carried a maximum of of coal and of fuel oil which gave them a range of at a speed of . They fired armor-piercing (AP) shells at a muzzle velocity of ; this gave a maximum range of . The eight 45-caliber 12-inch 41st Year Type were mounted in four twin-gun wing turrets, two on each broadside. Each turret could traverse 160°. The 45-caliber guns fired the same shell as the longer guns, although muzzle velocity was reduced to and range to . Each 12-inch gun was provided with 80 rounds, normally loaded at an elevation of +5°, although they could be loaded at any angle up to +13°. The guns had an elevation range of -5° to +25°. Their secondary armament consisted of ten 45-caliber 6-inch (152 mm) guns, mounted in casemates in the sides of the hull, and eight 40-caliber quick-firing (QF) 4.7-inch (120 mm) 41st Year Type guns. and the ships carried 150 rounds for each gun. The shell of the 4.7-inch gun weighed and was fired at a muzzle velocity of . Each gun was also provided with 150 rounds. They carried a total of 1,200 rounds for the longer guns and another 1,200 for the shorter guns. Two of the ships' boats could carry torpedoes and the ships carried a total of 24 Type 43 torpedoes. These had a warhead and a maximum range of at a speed of . Armor The waterline main belt of the Kawachi-class ships consisted of Krupp cemented armor that had a maximum thickness of 12 inches amidships and tapered to a thickness of inches at the ends of the ship. Approximately of the belt was above the waterline and below it. Above the belt was a strake of armor thick that covered the side of the hull up to the height of the middle deck. Above that was a 6-inch strake that protected the casemates. The barbettes for the main guns were thick above the weather deck and below it. The armor of all the 12-inch gun turrets had a maximum thickness of 11 inches with a 3-inch roof. The deck armor was thick and the conning tower was protected by of armor. ==Ships==

Following the Japanese ship-naming conventions, Kawachi and Settsu were named after ancient Japanese provinces, both now a part of Osaka prefecture. The only significant action performed by either ship during World War I was when they bombarded German fortifications in October–November 1914 during the final stage of the Battle of Qingdao. They were both assigned to the First Squadron until they were refitted in 1917 and 1916 respectively. Upon their completion of their refits, both ships were assigned to the Second Squadron. Settsu was reassigned to the First Squadron later that month. By this time, the dozen 40-caliber 3-inch 4th Year Type guns had been removed and four 3-inch anti-aircraft guns were added. Two of the torpedo tubes were also removed. The ship was converted into a target ship in 1924 with her armor reinforced to withstand hits. In 1935–1937, the ship was converted to radio-control which allowed her to be maneuvered by operators aboard another ship and additional armor was added. At the beginning of the Second Sino-Japanese War in 1937, she transported a battalion of naval troops to the Shanghai area. Settsu simulated the radio traffic of eight aircraft carriers at the beginning of the Pacific War in an effort to deceive Allied intelligence as to the locations and activities of the Japanese carriers. For the rest of the war she served as a target for carrier pilots. Settsu was badly damaged when Allied carrier aircraft attacked the IJN base at Kure in July 1945 and was forced to beach herself lest she sink. The ship was stricken from the Navy List on 20 November and her hulk was raised and broken up in 1946–1947. ==Notes==