 The Ibuki @-@ class ships were intended to be armed with four rotating quadruple 61 cm ( 24 in ) Type 92 torpedo tubes , two on each broadside . The ship carried 24 Type 93 torpedoes , 16 in the tubes and 8 in reserve . Quick @-@ reloading gear was installed for every mount that allowed the reserve torpedoes to be loaded in three to five minutes in ideal conditions . The Type 93 torpedo , fueled by compressed oxygen and widely referred to in post @-@ war literature as the " Long Lance " , had three range / speed settings . It had a range of 20 @,@ 000 meters ( 22 @,@ 000 yd ) at a speed of 48 knots ( 89 km / h ; 55 mph ) , 32 @,@ 000 meters ( 35 @,@ 000 yd ) at 40 knots ( 74 km / h ; 46 mph ) , or 40 @,@ 000 meters ( 44 @,@ 000 yd ) at a speed of 36 knots ( 67 km / h ; 41 mph ) . Before Ibuki was launched , one proposal was made to replace the aircraft and their equipment with five quintuple Type 0 torpedo tube mounts . Two of these would be mounted on each side and the last on the centerline , but nothing was done . 
