HMS Cato was a 50-gun Grampus-class fourth rate ship of the Royal Navy. One of a class of ships constructed for service in the American Revolutionary War, Cato was commissioned in 1782. She became the flagship of Sir Hyde Parker, and sailed with him to the East Indies Station later in the year. After stopping at Rio De Janeiro on 12 December, the ship sailed for the Cape of Good Hope and was never seen again. Theories on her disappearance include her being shipwrecked in locations such as the Malabar Coast and the Maldives, and the crew being murdered by natives. Sir John Knox Laughton argues that it is more likely that Cato caught fire and blew up at sea.

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Plan of Cato
History
Great Britain
Name	HMS Cato
Namesake	Cato the Elder
Ordered	17 February 1780
Builder	William Cleverley, Gravesend
Cost	£28,037
Laid down	June 1780
Launched	29 May 1782
Commissioned	May 1782
Fate	Missing, presumed lost January 1783
General characteristics [1]
Class and type	Grampus-class fourth rate
Tons burthen	107133⁄94 (bm)
Length	147 ft 10 in (45.1 m) (overall) 121 ft 5 in (37 m) (keel)
Beam	40 ft 8+3⁄4 in (12.4 m)
Depth of hold	17 ft 9 in (5.4 m)
Complement	350
Armament	Lower deck: 22 × 24-pounder guns Upper deck: 22 × 12-pounder guns Quarterdeck: 4 × 6-pounder guns Forecastle: 2 × 6-pounder guns

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In the American Revolutionary War the Royal Navy was in need of warships that were small enough to capably operate in the shallow waters around North America, but that were still large enough to provide effective firepower. The traditional two-decker ships of the line were too large to combat the smaller craft operated by the Continental Navy, while frigates were deemed too small and inappropriate to assist with expected amphibious operations. Instead the Royal Navy looked towards 44-gun fifth rates and 50-gun fourth rates, both of which were anomalous types of ships not large enough to join the line of battle but equally incapable of serving as a frigate would. These ships were however perfect for the war in America, and between 1775 and 1781 twenty-nine of them were ordered, of which ten were 50-gun fourth rates.^[2]

By 1780 the extant fourth rates in Royal Navy service were becoming worn, and several had been lost in the years of war. The Surveyor of the Navy Edward Hunt thus provided a new design to assist in replacing these. He produced the Grampus class, which was a version of Sir John Williams' proven Portland class with an extended gun deck.^[3][4] The class copied the Portland armament, with eleven lower deck gunports and twelve on the upper deck, but also incorporated some features from Williams' Experiment class, which had been an attempt to produce a lighter and faster fourth rate design. As such the Grampus ships were not to have the traditional roundhouse, with a set of false stern lights in place to infer otherwise.^[4][5] Other new features included a more substantial bow that connected the forecastle all the way to the sternpost; this feature subsequently became standard in all frigates but was only used in other fourth rates from the start of the nineteenth century.^[6]

Named after Cato the Elder, a Roman soldier and statesman, Cato was the second of two ships built to the Grampus design.^[7][1] Contracted to William Cleverley at Gravesend, Cato was ordered on 17 February 1780, laid down in June 1780 and launched on 29 May 1782 with the following dimensions: 147 feet 10 inches (45.1 m) along the gun deck, 121 feet 5 inches (37 m) at the keel, with a beam of 40 feet 8+3⁄4 inches (12.4 m) and a depth in the hold of 17 feet 9 inches (5.4 m). She measured 1,071 33⁄94 tons burthen.^[1]

Despite what Hunt's design expected, Cato was given a full roundhouse and a true stern gallery during her construction. This was at odds with her sister ship HMS Grampus, which was built true to the design.^[4] The addition of the roundhouse suggests that Cato was planned for use as a flagship, thus requiring the extra space.^[8] However, this meant that the number of gunports on her quarterdeck were decreased from four a side to three.^[1] Cato also received built-up bulwarks on her quarterdeck rather than the planned open rail design.^[6]

Cato sailed from Gravesend to Woolwich Dockyard later in the month of her launch. By the time of her completion copper sheathing was becoming a standard inclusion on ships, and she was coppered between 1 June and 12 June.^[9] She received her fitting out at the same time, and was completed on 10 October.^[1] Her construction and fitting out cost a total of £28,037.^[10] With a crew complement of 350, Cato was armed with twenty-two 24-pounder long guns on her lower deck, with twenty-two 12-pounder guns on her upper deck. On her quarterdeck were four 6-pounders, and a further two were on the forecastle.^[1] A new establishment for carronades on 50-gun ships was created in July 1779, but it is not recorded whether Cato received these additions.^{[lower-alpha 1][11]}

Captain James Clarke commissioned Cato in May 1782. The ship sailed on 13 October for the East Indies Station,^{[lower-alpha 2]} serving as the flagship of Vice-Admiral Sir Hyde Parker who was travelling to take up his position as commander-in-chief on the station.^{[lower-alpha 3]} Cato was in company with the 14-gun sloop HMS Hound.^[14][15] They reached Madeira on 27 October and continued their journey on 1 November.^{[lower-alpha 4][17]}