Post ship was a designation used in the

Royal Navy The Royal Navy (RN) is the United Kingdom's naval warfare force. Although warships were used by English and Scottish kings from the early medieval period, the first major maritime engagements were fought in the Hundred Years' War against ...

during the second half of the 18th century and the

Napoleonic Wars The Napoleonic Wars (1803–1815) were a series of major global conflicts pitting the French Empire and its allies, led by Napoleon I, against a fluctuating array of European states formed into various coalitions. It produced a period of Fren ...

to describe a ship of the

sixth rate 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 a ...

(see

rating system of the Royal Navy 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 assi ...

) that was smaller than a frigate (in practice, carrying fewer than 28 guns), but by virtue of being a rated ship (with at least 20 guns), had to have as its captain a

post captain Post-captain is an obsolete alternative form of the rank of captain in the Royal Navy. The term served to distinguish those who were captains by rank from: * Officers in command of a naval vessel, who were (and still are) addressed as captain ...

rather than a

lieutenant A lieutenant ( , ; abbreviated Lt., Lt, LT, Lieut and similar) is a commissioned officer rank in the armed forces of many nations. The meaning of lieutenant differs in different militaries (see comparative military ranks), but it is often ...

or commander. Thus ships with 20 to 26 guns were post ships, though this situation changed after 1817. (See “1817 changes” in

.) Sea officers often referred to the post ships as frigates though technically the Admiralty scrupulously never described them as such. The vessels were frigate-built, with traditional quarterdecks and

forecastle The forecastle ( ; contracted as fo'c'sle or fo'c's'le) is the upper deck of a sailing ship forward of the foremast, or, historically, the forward part of a ship with the sailors' living quarters. Related to the latter meaning is the phrase " be ...

s (the defining characteristic of post ships, distinguishing them from 20-gun ship-sloops), but, unlike true frigates, they lacked an

orlop The orlop is the lowest deck in a ship (except for very old ships). It is the deck or part of a deck where the cables are stowed, usually below the water line. According to the ''Oxford English Dictionary'', the word descends from Dutch Dut ...

platform amidships. They had a high centre of gravity, which made them slow and unweatherly, but they were seaworthy. In peacetime the Royal Navy frequently used them as substitutes for frigates, especially in distant foreign stations. In wartime their slowness meant they were used mostly as convoy escorts. Unlike other uses of the term "

ship A ship is a large watercraft that travels the world's oceans and other sufficiently deep waterways, carrying cargo or passengers, or in support of specialized missions, such as defense, research, and fishing. Ships are generally distinguished ...

" during this era, "post ship" in itself implies nothing as regards the rig of the vessel; however, all sixth rates were in practice

ship-rigged A full-rigged ship or fully rigged ship is a sailing vessel's sail plan with three or more masts, all of them square-rigged. A full-rigged ship is said to have a ship rig or be ship-rigged. Such vessels also have each mast stepped in three s ...

, i.e. were square-rigged on three masts. For an example of a post ship, see HMS ''Camilla''. She was one of ten ''Sphinx''-class post ships built during the 1770s. The United States Navy termed ships of this type "third-class frigates."

Sources

*Winfield, Rif ''British Warships in the Age of Sail: 1603-1714'', Barnsley (2009) ; ''British Warships in the Age of Sail: 1714-1792'', Barnsley (2007) ; ''British Warships in the Age of Sail: 1793-1817'', (2nd edition) Barnsley (2008). ; ''British Warships in the Age of Sail: 1817-1863'', Barnsley (2014) {{ISBN, 978-1-84832-169-4. *Winfield, Rif (2005) ''

British Warships in the Age of Sail ''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 ...

1793 - 1817''. (London: Chatham), p. 226. * Davy Lyon, ''The Sailing Navy List - all the Ships of the Royal Navy 1688-1860'', Conway Maritime Press, London 1993. History of the Royal Navy Royal Navy Post-ships