HMS Lowestoft was a Rothesay-class (Type 12M) anti-submarine frigate of the British Royal Navy, measuring 370 feet in overall length and 360 feet between perpendiculars. The vessel had a beam of 41 feet and a draught of 13 feet 6 inches. Powered by Y-100 machinery identical to the Whitby class, it featured two Babcock & Wilcox water-tube boilers supplying steam at 550 psi and 850°F to geared steam turbines, which drove two large propellers. The ship's machinery generated 30,000 shaft horsepower, enabling a maximum speed of approximately 29.5 knots. The crew complement was around 212 officers and men. Constructed at Alexander Stephen and Sons' Linthouse shipyard in Glasgow, Lowestoft was laid down on 19 June 1958, launched on 23 June 1960, and completed on 26 September 1961. Its initial armament included a twin 4.5-inch Mark 6 gun mount forward, with a planned twin 40 mm Bofors anti-aircraft mount aft, later replaced by the Seacat missile system, although initially fitted with a single Bofors mount due to delays. The anti-submarine armament comprised twelve 21-inch torpedo tubes for Mark 20E Bidder homing torpedoes and two Limbo mortars, though the torpedo tubes were eventually removed as the Bidder torpedoes proved ineffective against modern submarines. The ship's sensor suite included surface/air search radars (Type 293Q and Type 993), a height-finding radar (Type 277), fire control radars (Type 275 and Mark 6M), and sonar systems such as Type 174, Type 170, and Type 162, supporting its anti-submarine role. Between 1967 and 1969, Lowestoft underwent a significant modernization, including the addition of a hangar and flight deck for a Westland Wasp helicopter, a Seacat missile launcher, new radars, and defense systems such as the Chaff rocket dispenser. It served actively through the 1960s and 1970s, participating in operations such as search and rescue, notably after a helicopter crash in 1962, and in ceremonial events like the opening of the Forth Road Bridge in 1964. It also served as a NATO trials ship for towed array sonar in the late 1970s and briefly as a guardship during the Falklands War in 1982. Lowestoft was decommissioned on 29 March 1985 and was ultimately sunk as a target off the Bahamas on 8 June 1986 by HMS Conqueror with a Tigerfish torpedo, notably the last Royal Navy target to still display her pennant number at the time of sinking.

This description has been generated using GPT-4.1-NANO based on the Vessel's wikidata information and then modified by ShipIndex.org staff.