The type 92 mounts were a lightly armored box used to house four torpedo tubes for the 24 inch Type 93 Model 1 or 2 "Long Lance" oxygen-powered torpedoes. These torpedoes had a maximum speed of 48-50 knots and at slower speeds (36-38 knots), had a maximum range of about 40,000 meters (25 miles) !. The torpedoes were ejected by compress air during firing and could be reloaded from the rear in some ships.