Type 91 History
- Chronological Table
- 1931 Type 91 aerial torpedo is into service, start production.
- 1936 Revision 1. Self-detachable wooden plates are introduced.
- 1937 Launch-tests at 500m and 1,000m with wooden damper.
- 1939 Revision 2 starts production. The sinking level after water entry becomes big problem.
- 1941 Revision 2 cleared the test of shallow water launching by introduction of anti-rolling controller. Battle of Pearl Harbor, Battle of offshore Malay.
- 1941 Revision 3 starts production.
- 1942 Battle of Indian Ocean, Battle of the Coral Sea, Battle of Midway, Battle of the Santa Cruz Islands.
- 1943 Revision 5 starts production.
- 1944 Battle of offshore the Marianas Islands, Aerial Battle of offshore Formosa.
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