R-class destroyer (1916)

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HMS Skate in 1942
Class overview
Name	R class
Operators	Royal Navy  Royal Thai Navy
Preceded by	Admiralty M class
Succeeded by	Admiralty V class S class
Built	1916–1917
In commission	1916–1957
Completed	62
Lost	8
Preserved	1 (HMS Radiant, transferred to Royal Siamese Navy in 1920 and renamed Phra Ruang, survives as hulk
General characteristics
Type	Destroyer
Displacement	975 long tons (991 t) standard 1,035 long tons (1,052 t) built by Thornycroft 930 long tons (940 t) built by Yarrow
Length	276 ft (84.1 m)
Beam	26 ft 9 in (8.15 m)
Draught	9 ft 10 in (3.00 m)
Propulsion	3 boilers 2 geared Brown Curtis steam turbines, 27,000 shp
Speed	36 knots (41.4 mph; 66.7 km/h)
Range	3,440 nmi (6,370 km) at 15 kn (28 km/h)
Complement	82
Armament	3 × QF 4-inch (101.6 mm) Mark IV guns, mounting P Mk. IX 1 × single 2-pounder (40-mm) "pom-pom" Mk. II anti-aircraft gun 4 × 21 in (533 mm) torpedo tubes (2×2)

The first R class were a class of 62 destroyers built between 1916 and 1917 for the Royal Navy. They were an improvement, specifically in the area of fuel economy, of the earlier Admiralty M-class destroyers. The most important difference was that the Admiralty R class had two shafts and geared turbines, compared with the three shafts and direct turbines of the Admiralty M class, but in appearance the R class could be distinguished from its predecessors by having the after 4-inch gun mounted in a bandstand. The Admiralty ordered the first two of this class of ships in May 1915. Another seventeen were ordered in July 1915, a further eight in December 1915, and a final twenty-three in March 1916 (of which eleven were to a slightly modified design).

As well as these fifty ships to the standard 'Admiralty' design, twelve more R class were designed and built by the two specialist builders Yarrow Shipbuilders and John I. Thornycroft & Company to their own separate designs. Three were ordered from Thornycroft and four from Yarrow in July 1915, and two from Thornycroft and three from Yarrow in December 1915.

They were the last three-funnelled destroyers ordered by the Royal Navy (although HMS Bristol commissioned in 1973 had three funnels, these were not all on the centreline). All of these ships saw extensive service in World War I. Some saw service as minelayers. Eight R-class ships were sunk during the war and all but two of the surviving ships were scrapped in the 1920s and 1930s. One Admiralty R-class vessel, HMS Skate, survived to see service in World War II as a convoy escort, making her the oldest destroyer to see wartime service with the Royal Navy. A second, HMS Radiant was transferred to the Royal Siamese Navy as Phra Ruang in September 1920.