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Concept
HMS Ursa (R22)
Summary
HMS Ursa was a U-class destroyer of the Royal Navy that saw service during the Second World War. She was later converted into a Type 15 fast anti-submarine frigate, with the new pennant number F200.
Ursa was one of eight U-class destroyers ordered as the 7th Emergency Flotilla on 12 June 1941. The U-class were War Emergency Programme destroyers, intended for general duties, including use as anti-submarine escort, and were to be suitable for mass-production. They were based on the hull and machinery of the pre-war J-class destroyers, but with a lighter armament (effectively whatever armament was available) in order to speed production. The U-class were almost identical to the S-class ordered as the 5th Emergency Flotilla and the R-class ordered as the 6th Emergency Flotilla earlier in the year, but were not fitted for operations in Arctic waters.
The U-class were long overall, at the waterline and between perpendiculars, with a beam of and a draught of mean and full load. Displacement was standard and full load. Two Admiralty 3-drum water-tube boilers supplied steam at and to two sets of Parsons single-reduction geared steam turbines, which drove two propeller shafts. The machinery was rated at giving a maximum speed of and at full load. 615 tons of oil were carried, giving a range of at .
The ship had a main gun armament of four 4.7 inch (120 mm) QF Mk. IX guns, capable of elevating to an angle of 55 degrees, giving a degree of anti-aircraft capability. The close-in anti-aircraft armament for the class was one Hazemayer stabilised twin mount for the Bofors 40 mm gun and four twin Oerlikon 20 mm cannons. This was modified in 1945, with 5 single 40mm Bofors guns added, with one manually-operated Mark III mount in the searchlight position and four power-operated "Boffin" mounts replacing the twin Oerlikon mounts. Two quadruple mounts for 21 inch (533 mm) torpedoes were fitted (these were actually spare quintuple mounts with the centre tube removed), while the ship had an depth charge outfit of four depth charge mortars and two racks, with a total of 70 charges carried.
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