Type 90 torpedo

The Type 90 Pneumatic Torpedo (九〇式空気式魚雷, designated for Imperial Japanese calendar year 2590) was a 61 cm (24 in)-diameter surface-fired torpedo used by the Imperial Japanese Navy during World War II. It was notably first used in the Hatsuharu-class destroyers and in most cruisers, including the Furutaka, Aoba, Myoko, Takao, and Mogami-class heavy cruisers after refits during the 1930s. It is an evolution of the 8th Year Type torpedo and was superseded by the Type 93 oxygen torpedo, commonly called the Long Lance, as oxygen generating equipment was installed aboard surface ships.