 The Shōkaku @-@ class ships were fitted with four Kampon geared steam turbine sets , each driving one 4 @.@ 2 @-@ meter ( 13 ft 9 in ) propeller , using steam provided by eight Kampon Type Model B water @-@ tube boilers . With a working pressure of 30 kg / cm2 ( 2 @,@ 942 kPa ; 427 psi ) , the boilers gave the turbines enough steam to generate a total of 160 @,@ 000 shaft horsepower ( 120 @,@ 000 kW ) and a designed speed of 34 @.@ 5 knots ( 63 @.@ 9 km / h ; 39 @.@ 7 mph ) . This was the most powerful propulsion system in IJN service , 10 @,@ 000 and 8 @,@ 000 shaft horsepower ( 7 @,@ 500 and 6 @,@ 000 kW ) more than the Yamato class and the Mogami @-@ class cruiser , respectively . During their sea trials , the sister ships achieved 34 @.@ 37 – 34 @.@ 58 knots ( 63 @.@ 65 – 64 @.@ 04 km / h ; 39 @.@ 55 – 39 @.@ 79 mph ) from 161 @,@ 290 – 168 @,@ 100 shaft horsepower ( 120 @,@ 270 – 125 @,@ 350 kW ) . They carried 5 @,@ 000 metric tons ( 4 @,@ 900 long tons ) of fuel oil which gave them a range of 9 @,@ 700 nautical miles ( 18 @,@ 000 km ; 11 @,@ 200 mi ) at 18 knots ( 33 km / h ; 21 mph ) . The boiler uptakes were trunked to the ships ' starboard side amidships and exhausted just below flight deck level through two funnels that curved downward . The Shōkaku class was fitted with three 600 @-@ kilowatt ( 800 hp ) turbo generators and two 350 @-@ kilowatt ( 470 hp ) diesel generators , all operating at 225 volts . 
