 The ships were equipped with four Gihon geared steam turbines , each of which drove one 4 @.@ 191 @-@ meter ( 13 ft 9 in ) propeller . The turbines were designed to produce a total of 80 @,@ 000 shaft horsepower ( 60 @,@ 000 kW ) , using steam provided by 21 Kampon water @-@ tube boilers ; 15 of these were oil @-@ fired while the remaining half @-@ dozen used fuel oil that was sprayed on the coal to increase its burn rate . The boilers had a working pressure of 286 psi ( 1 @,@ 972 kPa ; 20 kgf / cm2 ) . 
