Historical category for Royal Navy vessels, based on number of guns
This article is about Royal Navy ships of the line. For the adjective meaning that something is of inferior quality, see wikt:third-rate. For the rating of late Georgian and early Victorian buildings, see Building Act 1774.
In the rating system of the Royal Navy, a third rate was a ship of the line which from the 1720s mounted between 64 and 80 guns, typically built with two gun decks (thus the related term two-decker). Years of experience proved that the third rate ships embodied the best compromise between sailing ability (speed, handling), firepower, and cost. So, while first-rates and second-rates were both larger and more powerful, third-rate ships were the optimal configuration.
Rating
When the rating system was first established in the 1620s, the third rate was defined as those ships having at least 200 but not more than 300 men; previous to this, the type had been classified as "middling ships". By the 1660s, the means of classification had shifted from the number of men to the number of carriage-mounted guns, and third rates at that time mounted between 48 and 60 guns. By the turn of the century, the criterion boundaries had increased and third rate carried more than 60 guns, with second rates having between 90 and 98 guns, while first rates had 100 guns or more, and fourth rates between 48 and 60 guns. By the latter half of the 18th century, they carried between 500 and 720 men.
This designation became especially common because it included the seventy-four gun ship, which eventually came to be the most popular size of large ship for navies of several different nations. It was an easier ship to handle than a first- or second-rate ship, but still possessed enough firepower to potentially destroy any single opponent other than a three-decker. It was also cheaper to operate.
By the end of the 18th century, ships of the line were usually categorized directly by their number of guns, the numbers even being used as the name of the class, as in "a squadron of three 74s", but officially the rating system continued until the end of the Age of Sail, only undergoing a modification in 1817.
Note that the use of terms like "third-rate" in literature can lead to confusion: The French Navy had a different system of five rates or rangs, but some British authors use the Royal Navy's rating of "third rate" when speaking of a French 74.
Bibliography
Rodger, N.A.M. The Command of the Ocean, a Naval History of Britain 1649-1815, London (2004). ISBN0-7139-9411-8.
Bennett, G. The Battle of Trafalgar, Barnsley (2004). ISBN1-84415-107-7.
Winfield, Rif, British Warships in the Age of Sail: 1603-1714, Barnsley (2009) ISBN978-1-84832-040-6; British Warships in the Age of Sail: 1714-1792, Barnsley (2007) ISBN978-1-84415-700-6; British Warships in the Age of Sail: 1793-1817, (2nd edition) Barnsley (2008). ISBN978-1-84415-717-4; British Warships in the Age of Sail: 1817-1863, Barnsley (2014) ISBN978-1-84832-169-4.
In the rating system of the British Royal Navy used to categorise sailing warships, a first rate was the designation for the largest ships of the line. Originating in the Jacobean era with the designation of Ships Royal capable of carrying at least 400 men, the size and establishment of first-rates evolved over the following 250 years to eventually denote ships of the line carrying at least 80 guns across three gundecks. By the end of the eighteenth century, a first-rate carried no fewer than 100 guns and more than 850 crew, and had a measurement (burthen) tonnage of some 2,000 tons.
In 1603 all English warships with a complement of fewer than 160 men were known as 'small ships'. In 1625/26 to establish pay rates for officers, a six-tier naval ship rating system was introduced. These small ships were divided into three tiers: fourth-, fifth- and sixth-rates. Up to the end of the 17th century, the number of guns and the complement size were adjusted until the rating system was actually clarified. A 'fourth-rate' was nominally a ship of over thirty guns with a complement of 140 men.
In the 18th century and most of the 19th, a sloop-of-war in the Royal Navy was a warship with a single gun deck that carried up to eighteen guns. The rating system covered all vessels with 20 guns and above; thus, the term sloop-of-war encompassed all the unrated combat vessels, including the very small gun-brigs and cutters. In technical terms, even the more specialised bomb vessels and fireships were classed as sloops-of-war, and in practice these were employed in the sloop role when not carrying out their specialised functions.
In the rating system of the Royal Navy used to categorise sailing warships, a second-rate was a ship of the line which by the start of the 18th century mounted 90 to 98 guns on three gun decks; earlier 17th-century second rates had fewer guns and were originally two-deckers or had only partially armed third gun decks. A "second rate" was the second largest class of warships in a hierarchical system of six "ratings" based on size and firepower.
In the rating system of the Royal Navy used to categorise sailing warships, a fifth rate was the second-smallest class of warships in a hierarchical system of six "ratings" based on size and firepower.
In the rating system of the Royal Navy used to categorise sailing warships, a sixth-rate was the designation for small warships mounting between 20 and 28 carriage-mounted guns on a single deck, sometimes with smaller guns on the upper works and sometimes without. It thus encompassed ships with up to 30 guns in all. In the first half of the 18th century the main battery guns were 6-pounders, but by mid-century these were supplanted by 9-pounders. 28-gun sixth rates were classed as frigates, those smaller as 'post ships', indicating that they were still commanded by a full ('post') captain, as opposed to sloops of 18 guns and less under commanders.
The rating system of the Royal Navy and its predecessors was used by the Royal Navy between the beginning of the 17th century and the middle of the 19th century to categorise sailing warships, initially classing them according to their assigned complement of men, and later according to the number of their carriage-mounted guns. The rating system of the Royal Navy formally came to an end in the late 19th century by declaration of the Admiralty. The main cause behind this declaration focused on new types of gun, the introduction of steam propulsion and the use of iron and steel armour which made rating ships by the number of guns obsolete.
HMS Cornwall was an 80-gun, third rate, ship of the line built for the Royal Navy in the 1690s. She served in the War of the Grand Alliance, and in her first year took part in the Battle of Barfleur and the action at La Hougue.
HMS Cornwall was a 74-gun third-rate Vengeur-class ship of the line built for the Royal Navy in the 1810s. She spent most of her service in reserve and was converted into a reformatory and a school ship in her later years. The ship was broken up in 1875.
HMS Severn was a 50-gun fourth-rate ship of the line of the Royal Navy, launched at Blackwall Yard in 1695.
HMS Falmouth was a 50-gun fourth-rate ship of the line built for the Royal Navy in the first decade of the 18th century. The ship participated in several battles during the War of the Spanish Succession (1701–15) and the War of Jenkins' Ear (1739–48).
HMS Gloucester was a 50-gun fourth-rate ship of the line built at Deptford by Joseph Allin the elder for the Royal Navy in 1710/11. She participated in the War of the Spanish Succession. The ship was burned to prevent capture after she was damaged in a storm during Commodore George Anson's voyage around the world in 1742.
The 1745 Establishment was the third and final formal establishment of dimensions for ships to be built for the Royal Navy. It completely superseded the previous 1719 Establishment, which had subsequently been modified in 1733 and again in 1741. Although partially intended to correct the problems of the ships built to the earlier Establishments, the ships of the 1745 Establishment proved just as unsatisfactory, and important changes in the make-up of the Admiralty and Navy Boards finally led to the end of the establishment era by around 1751.
British Warships in the Age of Sail is a series of four books by maritime historian Rif Winfield comprising a historical reference work providing details of all recorded ships that served or were intended to serve in the (British) Royal Navy from 1603 to 1863. Similar volumes dealing with other navies during the Age of Sail have followed from the same publisher.
Post ship was a designation used in the Royal Navy during the second half of the 18th century and the Napoleonic Wars to describe a ship of the sixth rate that was smaller than a frigate, but by virtue of being a rated ship, had to have as its captain a post captain rather than a lieutenant or commander. Thus ships with 20 to 26 guns were post ships, though this situation changed after 1817.
The Swan class were built as a 14-gun class of ship sloops for the Royal Navy, although an extra two guns were added soon after completion.
The Albacore-class gunboat, also known as "Crimean gunboat", was a class of 98 gunboats built for the Royal Navy in 1855 and 1856 for use in the 1853-1856 Crimean War. The design of the class, by W. H. Walker, was approved on 18 April 1855. The first vessels were ordered the same day, and 48 were on order by July; a second batch, which included Surly, were ordered in early October.
HMS Thetis was a 46-gun Leda-class fifth-rate frigate built for the Royal Navy during the 1810s. She was first commissioned in 1823 and was assigned to the South America Station three years later. The ship was wrecked in 1830 off Cape Frio, Brazil, with the loss of 22 crewmen; most of her cargo of bullion was successfully salvaged.
HMS Arethusa was a 46-gun Leda-class fifth-rate frigate built for the Royal Navy during the 1810s. The ship was never commissioned and was converted into a lazarette in 1836. She was renamed HMS Bacchus in 1844 and was further converted into a coal hulk in 1851–52. The ship was sold for scrap in 1883.
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