Usually 53 - 38 torpedoes were used , as the high - speed 53 - 39 torpedoes were available only in limited numbers .
The electric ET - 80 torpedoes were unreliable and the crews did not like them .
Usually 53 - 38 torpedoes were used , as the high - speed 53 - 39 torpedoes were available only in limited numbers , and the electric ET - 80 torpedoes were unreliable and the crews did not like them .