HMS Achilles was an innovative armoured frigate constructed at Chatham Dockyard for the Royal Navy, launched in 1863 and completed in 1864. Designed by Oliver Lang, she was notable for being the first iron-hulled warship built at a royal dockyard. She measured 380 feet 2 inches (115.9 meters) in length between perpendiculars, with a beam of 58 feet 3 inches (17.8 meters) and a draft of 27 feet 2 inches (8.3 meters). Displacing approximately 9,820 long tons (9,980 tonnes), Achilles featured a waterline armour belt that was 4.5 inches (114 mm) thick amidships, extending 212 feet (64.6 meters) along her length, and tapered at the ends. The hull was subdivided into 106 watertight compartments with a double bottom, contributing to her high stability despite a high center of gravity. Her propulsion system consisted of a single two-cylinder trunk steam engine built by John Penn and Sons, driving a 24-foot (7.3 meters) propeller, powered by ten rectangular boilers at 25 psi pressure. During sea trials, she reached a maximum speed of 14.32 knots. She carried 750 long tons (760 tonnes) of coal, giving her an operational range of 1,800 nautical miles at 6.5 knots. Originally ship-rigged with four masts—the only British warship ever to have this configuration—she boasted a sail area of 44,000 square feet (4,088 m²), though her sail plan was modified multiple times due to performance issues. Achilles's armament evolved significantly; initially intended to carry rifled 110-pounder breech-loading guns and 100-pounder smoothbore cannons, she was rearmed several times, ultimately mounting a mix of 16 nine-inch and 8-inch rifled muzzle-loaders in 1874. Her armor protection included a wrought-iron waterline belt and a main deck strake, both 4.5 inches thick, offering substantial defence against contemporary firepower. Her service record included assignments in the Channel Fleet, guardship duties at Portland and Liverpool, participation in the Dardanelles during the Russo-Turkish War, and a collision with HMS Alexandra in 1879. After decommissioning from active service in 1885, she served as a depot ship from 1901, renamed multiple times, until her sale for scrap in 1923. HMS Achilles’s design and service history highlight her importance as a pioneering ironclad during a transformative period in naval warfare.

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