Design and Description
The design of the Ibuki class was a minor improvement over the last pair of the Mogami class after those ships had been upgraded during the late 1930s. The main improvement was the replacement of the triple torpedo tube mounts in the older ships with quadruple mounts. They cost 60,000,000 yen each and had a crew of 54 officers and 822 enlisted men.
The ships had a length of 200.6 meters (658 ft 2 in) overall. They had a beam of 20.2 meters (66 ft 3 in) and a draft of 6.04 meters (19 ft 10 in). They displaced 12,220 tonnes (12,030 long tons) at standard load and 14,828 tonnes (14,594 long tons) (full load).
They were fitted with four Kampon geared steam turbine sets with a total of 152,000 shaft horsepower (113,000 kW), each driving a 3.9-meter (13 ft) propeller. Steam was provided by eight Kampon Ro Gō-type three-drum water-tube boilers that operated at a pressure of 22 kg/cm2 (2,157 kPa; 313 psi) and temperature of 300 °C (572 °F). The ships had a designed speed of 35 knots (65 km/h; 40 mph). They carried 2,163 tonnes (2,129 long tons) of fuel oil which gave them an estimated range of 6,300 nautical miles (11,700 km; 7,200 mi) at 18 knots (33 km/h; 21 mph). Electrical power was supplied by three 300-kilowatt (400 hp) turbo generators and two 200-kilowatt (270 hp) diesel generators.
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