 Carnot had two vertical triple expansion engines each driving a single screw , with steam supplied by twenty @-@ four Lagrafel d 'Allest water @-@ tube boilers . Her propulsion system was rated at 16 @,@ 300 indicated horsepower ( 12 @,@ 200 kW ) , which allowed the ship to steam at a speed of 17 @.@ 8 knots ( 33 @.@ 0 km / h ; 20 @.@ 5 mph ) . As built , she could carry 680 t ( 670 long tons ; 750 short tons ) of coal , though additional space allowed for up to 980 t ( 960 long tons ; 1 @,@ 080 short tons ) in total . 
