HMS Londonderry was a Grimsby-class sloop of the Royal Navy, constructed at Devonport Dockyard in the 1930s. She was launched on 16 January 1935 and commissioned later that year, with her construction completing on 20 September 1935. The vessel measured 266 feet 3 inches (81.15 meters) in length overall, with a beam of 36 feet (10.97 meters) and a deep load draught of 9 feet 6 inches (2.90 meters). Her displacement was approximately 990 long tons (1,010 tonnes) at standard load and 1,355 long tons (1,377 tonnes) at full load. Powered by two geared steam turbines driving two shafts, fed by Admiralty 3-drum boilers, Londonderry produced 2,000 shaft horsepower (1,500 kW), enabling her to reach a top speed of 16.5 knots (30.6 km/h). Her range was notable at 6,000 nautical miles (11,000 km) at 10 knots (19 km/h). The ship's armament initially included two 4.7-inch (120 mm) Mark IX guns placed fore and aft, supplemented by a single QF 3-inch (76 mm) anti-aircraft gun, four 3-pounder saluting guns, and eight machine guns. Her anti-submarine armament was modest initially, with four depth charges, but this was increased during her service. Londonderry underwent significant upgrades in 1939, replacing her main guns with dual-purpose 4-inch (102 mm) Mk XVI anti-aircraft guns, and later she received additional Oerlikon 20 mm cannons. Her anti-submarine equipment was also enhanced, with up to 60 depth charges and the addition of a Hedgehog anti-submarine mortar in 1943. Radar systems, including Type 286, Type 271, and Type 291, along with HF/DF radio direction-finding gear, were installed during her wartime service. Her operational history included deployments in the Red Sea and South Atlantic before WWII, serving as a convoy escort and patrol vessel. During the war, she participated in various convoy escort duties across the Atlantic, Mediterranean, and Channel, surviving several engagements, including attacks by German U-boats. Notably, she was involved in the sinking of the Italian submarine Pietro Calvi in July 1942 and was damaged by an underwater explosion in February 1943, which led to her stern breaking off. After repairs, she continued her escort duties until the end of hostilities. Decommissioned in 1945, HMS Londonderry was sold for scrap in 1948, marking her as a notable vessel in the Royal Navy's WWII escort fleet.

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