 O 'Brien had two <unk> steam turbines that drove her two screw propellers , and an additional pair triple @-@ expansion steam engines , each connected to one of the propeller shafts , for cruising purposes . Four oil @-@ burning White @-@ Forster boilers powered the engines , which could generate 17 @,@ 000 shaft horsepower ( 13 @,@ 000 kW ) , moving the ship at up to 29 knots ( 54 km / h ) . 
