 The ships had two 4 @-@ cylinder triple @-@ expansion steam engines , each driving a single propeller shaft . Steam for the engines was provided by 24 Belleville boilers and the engines were rated at a total of 14 @,@ 500 indicated horsepower ( 10 @,@ 800 kW ) . The sisters had a designed speed of 20 @.@ 75 knots ( 38 @.@ 43 km / h ; 23 @.@ 88 mph ) and both exceeded it by at least a 1 knot ( 1 @.@ 9 km / h ; 1 @.@ 2 mph ) during their sea trials from 15 @,@ 739 to 16 @,@ 078 ihp ( 11 @,@ 737 to 11 @,@ 989 kW ) . They carried up to 1 @,@ 527 long tons ( 1 @,@ 551 t ) of coal and could steam for 7 @,@ 000 nautical miles ( 13 @,@ 000 km ; 8 @,@ 100 mi ) at a speed of 10 knots ( 19 km / h ; 12 mph ) . 
