HMS Termagant (1847)
Wooden hulled steam screw frigate, 2403 tons displacement, 24 guns.
Launched at Deptford Dockyard 25 September 1847.
1863 Out of commission.
1867 Broken up.
Source of information here.
The engines, built by Seaward, were unusual. There were two pairs of opposed cylinders. The pair on each side had a common crankshaft driving a large gear wheel. The two large gears meshed with a central pinion to drive the propeller shaft.[1].
1848, August: 'The Termagant, steam frigate, 24 guns and 620 horse power, which was recently launched at Deptford, having been built at that dockyard from a design of Mr. White, of Cowes, and which was subsequently taken to the City Canal to have her engines put on board by Messrs. Seaward, was brought yesterday to Woolwich, and left again to-day for Sheerness, where she is to be completed for sea. Mr. White, Messrs. Seaward, and a numerous party were on board yesterday, and the working of the engines, and speed acquired by her screw propeller gave satisfaction. She is a powerful looking vessel, and with 300 tons of coals and 300 tons of iron ballast on board, draws 18 feet water aft. Her armament will consist of eighteen 32 pounder guns, 56 cwt. each, and 9 feet 6 inches long; two 68-pounder guns, 95 cwt. each, and 10 feet long, on pivot slides and carriages; and four 10-inch guns, 85 cwt. each, and 9 feet 4 inches long, on slides and carriages. She will have a crew of 250 men.'[2]
1849, December: 'The Termagant steam frigate, by White, of Cowes, 1556 tons, 24 guns, 620-horse power, by Seaward, went out on Wednesday under Commander Stevens, of the Blenheim, navigated by Mr. Robert C. Allen, Master of that ship, to the measured mile in Stokes Bay, to make a further trial of her steaming powers — a better result than heretofore achieved being desired by the Admiralty in return for the immense cost of the ship - about £70,000! Captain Ellice, Controller of Steam Machinery, on behalf of the Admiralty, came down expressly to witness and report upon this result. Two members of Messrs. Seawards firm also came down to attend the trial. Mr. Murray, Chief Engineer of the dockyard, went out in the ship, and numerous other officers. She was trimmed as if in commission, and drew — forward, 16 feet 2 inches ; aft, 17 feet 10 inches ; making her 20 inches by the stern. She made six runs at the measured mile, with the following result:—
[Speeds bewteen 6.452 and 10.112.]
Mean of means - 8.400 knots per hour. The engines performed all their functions in the most perfect and eminently satisfactory manner, and elicited marked praise and attention from the Admiralty Controller. The trial was under favourable auspices ; the wind was E. with a strong topgallant breeze and smooth water, in which she made the half-circle in 34 minutes. With the tide the wind was on the quarter ; running against the tide, the wind was three points on the bow. The result was considered more favourable than that obtained on her last trial on the 20th ult. She will be docked in a few days, and have divers means tried to improve her, after which she will be tried again with a new screw.'[3]