 During their 1930s modernization , the Miyahara boilers on each ship were replaced by six new Kanpon oil @-@ fired boilers , fitted into the former aft boiler room , and the forward funnel was removed . The Brown @-@ Curtis turbines were replaced by four geared Kanpon turbines with a designed output of 75 @,@ 000 shp ( 56 @,@ 000 kW ) . On her trials , Fusō reached a top speed of 24 @.@ 7 knots ( 45 @.@ 7 km / h ; 28 @.@ 4 mph ) from 76 @,@ 889 shp ( 57 @,@ 336 kW ) . The fuel storage of the ships was increased to a total of 5 @,@ 100 long tons ( 5 @,@ 200 t ) of fuel oil that gave them a range of 11 @,@ 800 nautical miles ( 21 @,@ 900 km ; 13 @,@ 600 mi ) at a speed of 16 knots ( 30 km / h ; 18 mph ) . 
