Ursa was one of eleven Modified R-class destroyers ordered by the British Admiralty in March 1916 as part of the Eighth War Construction Programme.[1] The design was a development of the existing R class, adding features from the Yarrow Later M class which had been introduced based on wartime experience.[2] The forward two boilers were transposed and vented through a single funnel, enabling the bridge and forward gun to be placed further aft. Combined with hull-strengthening, this improved the destroyer's ability to operate at high speed in bad weather.[3]
Ursa was 276 feet (84.1 m) long overall and 265 feet (80.8 m) long between perpendiculars, with a beam of 27 feet (8.2 m) and a draught of 11 feet (3.4 m).[2]Displacement was 1,035 long tons (1,052 t) normal and 1,085 long tons (1,102 t) at deep load. Power was provided by three Yarrow boilers feeding two Brown-Curtis geared steam turbines rated at 27,000 shaft horsepower (20,000 kW) and driving two shafts, to give a design speed of 36 knots (67 km/h; 41 mph).[1] Two funnels were fitted. A total of 296 long tons (301 t) of fuel oil were carried, giving a design range of 3,450 nautical miles (6,390 km; 3,970 mi) at 15 knots (28 km/h; 17 mph).[3]
On 17 November 1917, Ursa took part in the Second Battle of Heligoland Bight in support of the 1st Cruiser Squadron, led by Vice-Admiral Trevylyan Napier in Courageous.[7] Leading a destroyer force that included sisterships Urchin and Umpire, as well as Nerissa, the destroyer was one of the first to launch torpedoes at the German ships in the action.[8] It was while commanding Ursa that Tovey was awarded the Croix de Guerre "for distinguished services rendered during the war".[9] At the end of World War I, the destroyer was still part of the Thirteenth Destroyer Flotilla under the cruiser Champion.[10]
When the Grand Fleet was disbanded at the end of the First World War, Ursa was transferred to the Home Fleet, under the Flag of King George V,[11] remaining with the battleship on reserve at Portsmouth from 13 December 1919.[12] In 1923, the Navy decided to retire many of the older destroyers in preparation for the introduction of newer and larger vessels.[13]Ursa was sold to J. Smith on 13 July 1928 and broken up.[4]
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