Concept

61 cm Type 90 torpedo

Résumé
The 61 cm Type 90 torpedo was a surface-fired torpedo used by the Imperial Japanese Navy during World War II. It was used in the s and in most cruisers, including the , , , and heavy cruisers after refits during the 1930s. It was superseded by the Type 93 oxygen-powered torpedo, commonly called the Long Lance, as oxygen generating equipment was installed aboard the cruisers. Development The torpedo was based on a newly developed British Whitehead torpedo. This weapon used a new double-action two-cylinder engine rather than the four-cylinder radial engine used by World War I-era British torpedoes. It was significantly faster (), although it had a much shorter range (only ) than the Japanese 6th and 8th Year torpedoes. Twenty of these were bought with training warheads in 1926 for ¥30,000 each; the British allowed Japanese technicians to observe the manufacturing process and launch trials. Japan bought a manufacturing license in 1928 for ¥150,000. The Japanese did no
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