Propulsion The Shiratsuyu class, as with the previous Hatsuharu class, carried two sets of Kampon geared turbines, one for each shaft. Each set consisted one low-pressure and one high-pressure turbine, plus a cruise turbine connected to the high-pressure turbine. The LP and HP turbines were connected to the propeller shaft by a two-pinion reduction gear. Each propeller had a diameter of and a pitch of . The total horsepower of the Shiratsuyu class was only compared to the of their Fubuki-class predecessors, but the machinery was significantly lighter and more powerful on a unit basis. The Shiratsuyus machinery weighed only compared to the of the Fubuki class, or 396 shaft horsepower per tonne versus 347 shaft horsepower per tonne for the older ships. Similarly the three Kampon Type Ro-Gō boilers used in the Shiratsuyu-class ships weighed in comparison to the boilers used in the Fubuki class, but produced each while the older boilers produced . This gave a ratio of 3.6 kg per shaft horsepower for the Shiratsuyu class compared to the 4.1 kg per shaft horsepower of their predecessors. The newer design of boilers initially used steam pressurized to , just like the older models, but used superheating to improve efficiency while the older boilers simply used saturated steam. A single 100 kW turbo-generator was fitted behind the reduction gears in a separate compartment and two 40 kW diesel generators were located between the propeller shafts. As initially completed the Shiratsuyu class had a range of at a speed of with of fuel. Armament The Shiratsuyu-class destroyers used the same 50 caliber 12.7 cm/50 Type 3 naval gun as the Fubuki class, but all turrets could elevate to 75° to give the main guns a minimal ability to engage aircraft. During the war the single turret in "X" position was removed on all surviving ships and replaced with two triple Type 96 anti-aircraft guns, while other guns were added so that between 13 to 21 (depending on the individual vessel) of this calibre were eventually carried in double and triple mounts. Although these powered mounts were unsatisfactory because their traverse and elevation speeds were too slow to engage high-speed aircraft more single mounts were fitted to ships in the last year of the war. Four 13 mm guns were also added. For example, of the related Hatsuharu class mounted ten single 25 guns when she was lost in July