I believe they were " Long Lance" Torpedoes
I believe that the Torpedoes used By the Imperial Japanese Navy were the " Long Lance " Torpedoes that were used from the beginning of the war. If my memory serves me well then they were 21 inches in Diameter and longer than those used my the U.S. Navy at the time. In the Attack on Pearl Harbor Plywood Fins were attached to them to make them run at a more shallow depth and be able to reach thier set depth quicker.
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