 O 'Brien had two Zoelly 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 ) . 
 O 'Brien had two Zoelly steam turbines <a href='null_relcl' title='1'><mark>that</mark></a>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 ) . 
O 'Brien had two Zoelly steam turbines drove her 2 screw propellers , and an additional pair triple @-@ expansion steam engines , each connected to one of da propeller shafts , for ridin purposes . Four oil @-@ burning White @-@ Forster boilers powered tdaengines , which could generate 17 @,@ 000 shaft horsepower ( 13 @,@ 000 kW ) , movin the ship at up to 29 knots ( 54 km / h ) .