HMS Hecate was the last of four Cyclops-class breastwork monitors constructed for the Royal Navy in the 1870s. This class was a modified version of the Cerberus class, designed with a robust armored superstructure. The vessel measured approximately 225 feet (68.6 meters) in length between perpendiculars and had a beam of 45 feet (13.7 meters). Its draught at deep load was 16 feet 3 inches (4.95 meters), and it displaced about 3,480 long tons (3,540 metric tons). The ship's crew comprised 156 officers and men. Powered by two 4-cylinder inverted compound steam engines, each driving a single propeller, HMS Hecate produced a total of 1,472 indicated horsepower during sea trials, reaching a maximum speed of 11.2 knots (20.7 km/h). The ship carried 250 long tons (250 metric tons) of coal, which allowed her to steam approximately 3,000 nautical miles (5,600 km) at 10 knots. Armament consisted of four 10-inch rifled muzzle-loading guns, mounted in twin-gun turrets positioned fore and aft of the superstructure. These guns were capable of firing both solid shot and explosive shells, with hydraulic jacks used for elevation and depression. The ship's armor was extensive, featuring an 8-inch (203 mm) wrought iron waterline belt amidships, tapering to 6 inches (152 mm) at the ends. The superstructure and conning tower were fully armored with 8–9 inches (203–229 mm) of wrought iron, while the gun turrets had 10 inches on the faces and 9 inches on the sides and rear. The vertical armor was backed by 9–11 inches (229–279 mm) of teak. The decks were relatively thin, with a thickness of 1.5 inches (38.1 mm). HMS Hecate served until the early 20th century, being placed on the non-effective list in January 1902 along with her sister ships, Cyclops and Gorgon. She was sold for scrap the following year, marking the end of her maritime service. Her design and armor made her a notable example of Victorian-era coastal defense ships, emphasizing armored protection and firepower suited to harbor and coastal operations.

This description has been generated using GPT-4.1-NANO based on the Vessel's wikidata information and then modified by ShipIndex.org staff.