 In 1927 , Mutsu 's bow was remodeled to reduce the amount of spray produced when steaming into a head sea . This increased her overall length by 1 @.@ 59 meters ( 5 ft 3 in ) to 217 @.@ 39 meters ( 713 ft 3 in ) . This proved successful and her sister 's bow was rebuilt in 1930 . During their 1934 – 36 reconstruction , the ships ' sterns were lengthened by 7 @.@ 55 meters ( 24 @.@ 8 ft ) to improve their speed and their forward superstructures were rebuilt into a pagoda mast . They were given torpedo bulges to improve their underwater protection and to compensate for the weight of the additional armor and equipment . These changes increased their overall length to 224 @.@ 94 m ( 738 @.@ 0 ft ) , their beam to 34 @.@ 6 m ( 113 ft 6 in ) and their draft to 9 @.@ 49 meters ( 31 ft 2 in ) . Their displacement increased over 7 @,@ 000 metric tons ( 6 @,@ 900 long tons ) to 46 @,@ 690 metric tons ( 45 @,@ 950 long tons ) at deep load . 
