[1] For surface running, the boats were powered by a single 16-cylinder 600-brake-horsepower (447 kW) Vickers petrol engine that drove one propeller shaft.

On the surface, the C class had a range of 910 nautical miles (1,690 km; 1,050 mi) at 12 knots (22 km/h; 14 mph).

They could carry a pair of reload torpedoes, but generally did not as they would have to remove an equal weight of fuel in compensation.

The obsolete C3 was packed full of explosives for her last mission, which was to destroy a viaduct connecting the mole to the shore during the Zeebrugge Raid on 23 April 1918.

Her commanding officer, Richard Douglas Sandford, received the Victoria Cross for the successful action.