The Magicienne-class ships had a length at the gun deck of 210feet and 185feet at the keel. They had a beam of 36feet, and a depth of hold of 24feet. The ships' tonnage was 1,256 tons burthen and they had a draught of 8feet. Their crew numbered 175 officers and ratings.[1]
The ships were fitted with a pair of 2-cylinder oscillating steam engines, rated at 400 nominal horsepower, that drove their paddlewheels. The engines produced 1300ihp in service that gave them speeds of 9kn10kn. The ships were armed with eight 32-pounder (56 cwt)[2] cannon on the gundeck. On the upper deck were one each 68-pounder (95 cwt) and a 10inches (85 cwt) shell guns as well as four more 32-pounders.[3]
Valorous was built at a cost of £69,064, of which her machinery cost £24,329.[1] She was originally ordered on 25 April 1847 as a first-class sloop to John Edye's design, approved on 12 August 1847. On 5 August they were re-ordered as 210feet vessels. When finished, they constituted the last group of paddle warships built for the Royal Navy.[3]
In 1852 she was in the Mediterranean Sea, then in 1854 she was assigned to the Baltic Sea. On 23 July, Valorous ran aground off Åland, Grand Duchy of Finland. She was severely damaged, losing her forefoot and keel and being holed. A sail was placed over the hole and her crew managed to prevent her from sinking.[4] In 1855 she operated in the Black Sea during the Crimean War. In 1857 she was on the North America and West Indies Station, and from 1863 until she was paid off in September 1867 she operated off the Cape of Good Hope. On 10 January 1871, she was driven from her moorings and ran aground at Plymouth, Devon. Damage was described as slight.[5] Carrying extra stores, she accompanied the British Arctic Expedition ships and as far as Qeqertarsuaq, Godhavn in 1875.[6] On 27 July, Valorous ran aground 10nmi off Holstenborg, Greenland. She was refloated and found to be leaky. She was taken in to Holstenborg for repairs, which took ten days. A watertight bulkhead was inserted at the bow as part of the repairs.[7] In 1878 she was commanded by Captain John A Fisher (later Admiral of the Fleet).[8]
She was sold on 27 February 1891 to E Marshall of Plymouth for breaking up.[1]