HMS Endymion was a 21-gun Ister-class wooden screw frigate, notable for being the last wooden frigate built at Deptford Dockyard. She measured 240 feet (73.2 m) in length, with a beam of approximately 47 feet 11 inches (14.6 m) and a draught of 18 feet 8 inches (5.69 m). Her displacement was around 3,197 tons, and she had a burthen of 2,478 30/94 tons BOM. The vessel was powered by a steam engine rated at 500 nominal horsepower, built by Napier & Sons, which drove an 18-foot (5.49 m) diameter screw propeller with a 21-foot (6.40 m) pitch. She was also rigged as a full ship, combining sail and steam propulsion. Constructed with her keel laid on 20 October 1860, Endymion was launched on 18 November 1865 in front of a crowd of 40,000 spectators, and she was commissioned in September 1866. Her armament initially included four 100-pounder rifled muzzle-loading guns, fourteen 8-inch guns, and nine 110-pounder breech-loading guns, designed to carry a total of 36 guns, although her actual fitting varied over her service. Endymion’s service was extensive. She spent much of her early career based at Malta and participated in a circumnavigation of the globe as part of the Flying Squadron from 1869 to 1870, during which she visited numerous ports including Gibraltar, Alexandria, and various locations in South America, Australia, and Japan. She was involved in rescue operations, fire-fighting efforts, and diplomatic missions, such as transporting a Japanese prince and carrying Sir J Drummond Hay. Her speed trials averaged around 11.7 knots, and she demonstrated the capabilities of a late wooden screw frigate during her active years. In later years, Endymion served as a guard ship at Hull, a training ship for cadets, and later as an administration and hospital ship under the Metropolitan Asylums Board during smallpox epidemics. She was modified for hospital use, offering accommodation, laundry, and heating facilities. She remained in service until 1904, when she was sold for breaking up, ending her maritime career after nearly four decades of service and various roles, marking her as a significant vessel in the transition from wooden sailing ships to modern steam-powered navies.

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