HMS Hydra was the lead ship of her class of wooden steam paddle sloops of the British Royal Navy, launched in 1838 at Chatham Dockyard. After taking part in operations during the Syrian War in 1840, she then served on anti-slavery operations and also as a survey vessel. She was scrapped in 1870.
HMS Rattler was a 9-gun steam screw sloop of the Royal Navy, and one of the first British warships to be completed with screw propulsion. She was originally ordered as a paddle wheel 4-gun steam vessel from Sheerness Dockyard on 12 March 1841. She was reordered on 24 February 1842 as a propeller type 9-gun sloop from HM Royal Dockyard, Sheerness, as a new vessel. William Symonds had redesigned the ship as a screw propeller driven vessel.
HMS Trident was an iron paddle sloop built for the Royal Navy by Ditchburn & Mare in 1845 at Leamouth, London. She served in the Mediterranean, off West Africa and in the South Atlantic, and was broken up in 1866.
HMS Daring was a 12 gun-brig of the Royal Navy which became part of the Experimental Squadrons of both 1844 and 1845, and later served in the West Indies. She was sold in 1864.
HMS Ardent was a wooden Alecto-class paddle sloop, and the fourth ship of the Royal Navy to use the name. She was launched on 12 February 1841 at Chatham and spent much of her career on the West Coast of Africa engaged in anti-slavery operations. One of the ship's company, Gunner John Robarts, was awarded the Victoria Cross for the destruction of Russian food stores in the Crimean War. She was scrapped in 1865.
HMS Niger was originally slated to be built as a Sampson designed sloop; however, she was ordered as a First-Class sloop with screw propulsion on 20 February 1845 to be built at Woolwich Dockyard, along the design developed by Oliver Lang and with a hull like the Basilisk designed paddle sloops. Her armament and engine were to be like the Encounter Design building at Pembroke. A second vessel (Florentia) was ordered on 26 March 1846 but after her keel was laid at Pembroke Dockyard, her construction was suspended on 6 October 1846 then cancelled three years later, on 22 May 1849. Niger She conducted important propulsion trials, finally proving the superiority of screw propulsion and served in West Africa, the Crimea, China, the East Indies and Australia. She took part in the New Zealand wars in 1860 and was sold for breaking in 1869.
HMS Salamander was one of the initial steam powered vessels built for the Royal Navy. On 10 January 1831 the First Sea Lord gave orders that four paddle vessels be built to competitive designs. The vessels were to be powered by Maudslay, Son & Field steam engines, carry a schooner rig and mount one or two 10-inch shell guns. Initially classed simply as a steam vessel (SV), she was re-classed as a second-class steam sloop when that categorization was introduced on 31 May 1844. Designed by Joseph Seaton, the Master Shipwright of Sheerness, she was initially slated to be built in Portsmouth, and was changed to Sheerness Dockyard. She was launched and completed in 1832, took part in the Second Anglo-Burmese War and was broken up in 1883.
HMS Virago was a Royal Navy Driver-class wooden paddle sloop launched on 25 July 1842 from Chatham Dockyard.
HMS Phoenix was a 6-gun steam paddle vessel of the Royal Navy, built in a dry dock at Chatham in 1832. She was reclassified as a second-class paddle sloop before being rebuilt as a 10-gun screw sloop in 1844–45. She was fitted as an Arctic storeship in 1851 and sold for breaking in 1864.
HMS Lizard was a Jackal-class second-class iron paddle gunvessel of the Royal Navy. She was built by Robert Napier and Sons at Govan to a design by William Symonds, the Surveyor of the Navy. She was launched in 1844, was damaged at the Anglo-French blockade of the Río de la Plata, performed fishery protection duties off Scotland and broken up in 1869.
The Hydra class were a class of three paddlewheel steam sloops of the British Royal Navy. They saw active service variously in the Baltic during the Crimean War, against Ottoman forces in Syria and against slavers in West Africa. Latterly, Hydra and Hecate were used for surveys in the Mediterranean, the Pacific, Australia and the Atlantic, and thus their names were re-used for the Hecla-class survey vessels in the late 20th century. Two of the classes were broken up after more than twenty-five years of service, and Hecla was sold for commercial use in 1863.
HMS Esk was a Cyrus-class ship-sloop launched at Ipswich in 1813. During the War of 1812 she captured one United States privateer, and fought an inconclusive action with another. Between 1825 and 1827 Esk was part of the West Africa Squadron, engaged in suppressing the trans-Atlantic slave trade, during which period she captured a number of slave ships. A prize she had taken also engaged in a notable single ship action. The Royal Navy sold Esk in 1829. Green, Wigram, and Green purchased her and between 1829 and 1845 she made four voyages in the British southern whale fishery as the whaler Matilda.
HMS Archer was initially ordered as one of two Rifleman type gunvessels on 25 April 1846. With her construction suspended in September 1846, she was reordered on as a sloop on 25 April 1847 to be constructed to a design of John Edye as approved on 25 August. With the exception of two years on Baltic service during the Russian War of 1854 to 1855 she spent the majority on the West Coast of Africa on the anti-slavery patrol. This service involved anti-slavery work on the coasts of the Bight of Benin, and was notoriously unhealthy, with tropical diseases taking a heavy toll of British seamen. One of her commanders died and three others were invalided. Archer was reclassified as a corvette in 1862. She finally returned to Home waters, being sold for breaking in January 1866
HMS Vesuvius was initially a Steam Vessel second class designed by Sir William Symonds, Surveyor of the Navy, and built at Sheerness. She was commissioned and participated in the bombardment of Acre in 1840, during the Russian War she was in the Black Sea and the Sea of Azov in 1855. Her last overseas posting was in the West Indies. She was sold for breaking in June 1865.
HMS Alecto was an Alecto-class sloop designed by Sir William Symonds, Surveyor of the Navy. Originally classed as a steam vessel (SV3), her classification would be changed to a Third Class Sloop. She initially served in the Mediterranean, prior to her tug of war with the Rattler. She spent her time in the Americas and mainly on the anti-slavery patrol off the west coast of Africa. She was broken up in November 1865
HMS Prometheus was an Alecto-class sloop designed by Sir William Symonds, Surveyor of the Navy. Originally classed as a steam vessel (SV3), her classification would be changed to a Third Class Sloop. She initially served mainly on the west coast of Africa on the anti-slavery patrol except for a brief period on particular service in the Black Sea in late 1855. She was sold on 5 March 1863 for breaking.
HMS Inflexible was a Bulldog-class sloop designed by Sir William Symonds, Surveyor of the Navy. Originally she was ordered as a Driver-class sloop, however, under Admiralty Order of 26 December 1843 she was directed to be built to a new specification. After commissioning she sailed for the East Indies and participated in the last year of the New Zealand War of 1845 to 1847. She then was in the Black Sea for the Crimean War followed by the Second Opium War with China. She was sold for breaking in July 1864.
HMS Scourge was a Bulldog-class sloop designed by Sir William Symonds, Surveyor of the Navy. Originally she was ordered as a Driver-class sloop, however, under Admiralty Order of 26 December 1843 she was directed to be built to a new specification. She was initially commissioned for service with the Channel Squadron before moving to the North America and West Indies Station. She then served in the Mediterranean then the west coast of Africa. Her final service was in the Mediterranean. She was broken in 1865.
HMS Bulldog was a Bulldog-class sloop designed by Sir William Symonds, Surveyor of the Navy. Originally she was ordered as a Driver-class sloop, however, under Admiralty Order of 26 December 1843 she was directed to be built to a new specification. After commissioning she sailed for the Cape of Good Hope. She then was in the Baltic Sea for the Crimean War. She carried out ocean sounding for the Atlantic telegraph. She was lost while in action with the Haitians in 1865.
HMS Fury was a Bulldog-class sloop designed by Sir William Symonds, Surveyor of the Navy. She was ordered on 19 February 1844. After commissioning she sailed for the East Indies and participated in action against pirate junks near Vietnam. She then was in the Black Sea for the Crimean War followed by the Second Opium War with China. She was sold for breaking in July 1864.
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