HMS Neptune was an ironclad turret ship constructed initially for the Imperial Brazilian Navy under the name Independencia. Designed by Sir Edward Reed in 1872, she was modeled as a masted adaptation of HMS Devastation, resembling an enlarged HMS Monarch. The vessel measured approximately 300 feet (91.4 meters) in length between perpendiculars, with a beam of 63 feet (19.2 meters) and a draft of 25 feet (7.6 meters). Her normal displacement was around 8,964 long tons, increasing to over 9,300 long tons at deep load. Constructed by J & W Dudgeon in London, her launch in 1874 was marred by difficulties, including getting stuck on the slipway and damaging her bottom plating, which contributed to the company's bankruptcy. After several trials and minor incidents, including running aground in the Thames and a collision with a British steamship, she was purchased by the Royal Navy in 1878 for £600,000, with additional funds spent to modify her for British service. Reconfigured for the Royal Navy, HMS Neptune's armament included two 12.5-inch (317 mm) muzzle-loading rifles per turret and two 9-inch (229 mm) rifled guns as chase weapons, along with six 20-pounder Armstrong saluting guns and two 14-inch (356 mm) Whitehead torpedo tubes. Her armor comprised a 12-inch wrought iron waterline belt extending above and below the waterline, a protected citadel with 10- to 13-inch armor, and turret faces 13 inches thick, backed by thick teak. She was powered by a single 2-cylinder trunk steam engine producing approximately 8,832 indicated horsepower, reaching speeds of nearly 14.65 knots. Her rigging consisted of barque sails, though her close-proximity twin funnels and rigging proved impractical, leading to her rig being simplified in 1886–87. Throughout her career, she served with the Channel Fleet, then the Mediterranean Fleet, and later as a coastguard guard ship at Holyhead. Decommissioned in 1893 and later transferred to reserve, she was sold for scrap in 1903. Her final voyage was marked by a stormy incident during her tow to the breakers in Germany, where she narrowly avoided collisions with several ships, including HMS Victory, before being broken up in 1904.

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