Mutsuki

The Mutsuki class (睦月) destroyers were based on the same hull design as the previous Kamikaze class, except with a double curvature configuration of the bow, a feature which became a standard in all later Japanese destroyers.

The Mutsuki class was the first to be fitted with the newly developed 24 inch torpedoes, with greater range and larger warhead than previous torpedoes in the Japanese inventory. Originally Type 8 torpedoes were carried, arranged in two triple mountings. These were later replaced with the famous Type 93 "Long Lance" oxygen-propelled torpedoes during World War II.

In September 1935, many ships in the navy were severely damaged by a typhoon while on training exercises, in what was later termed the "Fourth Fleet Incident", including a number of the Mutsuki class destroyers, which had several plates buckled and bridges wrecked. During 1936-37 the Mutsuki class ships were retrofitted with a strengthened, more compact, bridge, with redesigned watertight shields on the torpedo mounts. With the new shields the torpedoes could be worked in all weather conditions thus extending the useful life of the class.[8]

From 1941-1942 the Mutsuki class destroyers were refitted with the 120 mm/45 main guns reduced to two single mounts and ten Type 96 25 mm AT/AA Guns added. The minesweeping and minelaying equipment was removed and replaced with four depth charge launchers, with 36 depth charges.