 The ship was powered by two vertical triple @-@ expansion steam engines , each driving one propeller shaft . Steam for the engines was supplied by eight Scotch marine boilers . Designed for a maximum output of 13 @,@ 000 indicated horsepower ( 9 @,@ 700 kW ) and a speed of 19 knots ( 35 km / h ; 22 mph ) , Vettor Pisani only reached a speed of 18 @.@ 6 knots ( 34 @.@ 4 km / h ; 21 @.@ 4 mph ) during her sea trials despite slightly exceeding her designed horsepower with 13 @,@ 259 ihp ( 9 @,@ 887 kW ) . She had a cruising radius of about 5 @,@ 400 nautical miles ( 10 @,@ 000 km ; 6 @,@ 200 mi ) at a speed of 10 knots ( 19 km / h ; 12 mph ) . 
