 Sardegna was 130 @.@ 73 meters ( 428 @.@ 9 ft ) long overall ; she had a beam of 23 @.@ 44 m ( 76 @.@ 9 ft ) and an average draft of 8 @.@ 84 m ( 29 @.@ 0 ft ) . She displaced 13 @,@ 641 metric tons ( 13 @,@ 426 long tons ; 15 @,@ 037 short tons ) normally and up to 15 @,@ 426 t ( 15 @,@ 182 long tons ; 17 @,@ 004 short tons ) at full load . Her propulsion system consisted of a pair of triple @-@ expansion steam engines , each driving a single screw propeller , with steam supplied by eighteen coal @-@ fired , cylindrical fire @-@ tube boilers . She was the first Italian warship to be equipped with triple expansion engines . Her propulsion system produced a top speed of 20 @.@ 3 knots ( 37 @.@ 6 km / h ; 23 @.@ 4 mph ) at 22 @,@ 800 indicated horsepower ( 17 @,@ 000 kW ) . Specific figures for her cruising radius have not survived , but the ships of her class could steam for 4 @,@ 000 to 6 @,@ 000 nautical miles ( 7 @,@ 400 to 11 @,@ 100 km ; 4 @,@ 600 to 6 @,@ 900 mi ) at a speed of 10 knots ( 19 km / h ; 12 mph ) . She had a crew of 794 officers and men . Sardegna was one of the first warships equipped with Marconi 's new wireless telegraph . 
