As a torpedo boat, the planned armament was a single QF 12 pounder 12 cwt ( 3 inches calibre) gun on a platform on the ship's conning tower (in practice the platform was also used as the ship's bridge) and one six-pounder (57mm) gun aft, with a single fixed 18 inch (450 mm) torpedo tube in the ship's bow and two more 18 inch tubes on a rotating mount.