displacement increased by over to at deep load. The crew now numbered 1,376 officers and enlisted men. Propulsion The Ise-class ships had two sets of direct-drive steam turbines, each of which drove two propeller shafts, using steam provided by 24 Kampon Ro Gō water-tube boilers. The turbines were designed to produce a total of and give the ships a speed of . Ise reached from during her sea trials. Each of the boilers consumed a mixture of coal and oil, and the ships carried enough of both to give them a range of at a speed of . During their 1930s modernisation, the boilers on each ship were replaced by eight new Kampon oil-fired boilers. The turbines were replaced by four geared Kampon turbines with a designed output of intended to increase their speed to . On her trials, Ise reached a top speed of from . The fuel storage of the ships was increased, which gave them a range of at a speed of , despite the additional weight. Armament The twelve Type 41 guns of the Ise class were mounted in three pairs of twin-gun, superfiring turrets that were numbered one through six from front to rear. The first pair was forward of the main superstructure, the second pair was amidships, and the last ones were aft of the rear superstructure. The ships' secondary armament consisted of twenty Type 3 guns in single mounts. Eighteen of these were mounted in casemates in the forecastle and superstructure and the remaining pair were mounted on the deck above them and protected by gun shields. Anti-aircraft defence was provided by four 3rd Year Type 8-centimetre (3 in) anti-aircraft (AA) guns in single mounts. The ships were also fitted with six submerged torpedo tubes, three on each broadside. In 1931–1933 the AA guns were replaced with eight Type 89 dual-purpose guns, placed beside the forward superstructure in four twin-gun mounts. Two twin-gun mounts for licence-built Vickers two-pounder () light AA guns were also added, while the pair of 14 cm guns on the upper deck were removed. During the mid-1930s reconstruction, the torpedo tubes were removed and the Vickers two-pounders were replaced by 20 licence-built Hotchkiss Type 96 light AA guns in 10 twin-gun mounts. This was the standard Japanese light AA gun during World War II, but it suffered from serious design shortcomings that heavily reduced its effectiveness. According to historian