HMCS Amherst was a of the Royal Canadian Navy. She served primarily in the Battle of the Atlantic on convoy protection duty during the Second World War. She was named for Amherst, Nova Scotia. The ship was laid down at Saint John Dry Dock and Shipbuilding Co. Ltd. in Saint John, New Brunswick, on 23 May 1940 and launched on 3 December later that year. Amherst was commissioned on 5 August 1941 and served in the Battle of the Atlantic and Battle of the St. Lawrence, earning battle honours for both actions. After the war, the ship was decommissioned and sold to Venezuelan Navy in 1945 and renamed Carabobo. However, while en route to Venezuela, the ship was wrecked in the Gulf of St. Lawrence that same year.
Design and description
Flower-class corvettes like Amherst serving with the Royal Canadian Navy (RCN) during the Second World War were different from earlier and more traditional sail-driven corvettes. The Flower-class corvettes originated from a need that arose in 1938 to expand the Royal Navy following the Munich Crisis. A design request went out for a small escort for coastal convoys. Based on a traditional whaler-type design, the initial Canadian ships of the Flower class had a standard displacement of . They were long overall with a beam of and a maximum draught of . The initial 1939–1940 corvettes were powered by a four-cylinder vertical triple expansion engine powered by steam from two Scotch boilers turning one three-bladed propeller rated at . The Scotch boilers were replaced with water-tube boilers in later 1939–1940 and 1940–1941 Programme ships. The corvettes had a maximum speed of . This gave them a range of at . The vessels were extremely wet.
The Canadian Flower-class vessels were initially armed with a Mk IX BL gun forward on a CP 1 mounting and carried 100 rounds per gun. The corvettes were also armed with a QF Vickers 2-pounder () gun on a bandstand aft, two single-mounted .303 Vickers machine guns or Browning 0.5-calibre machine guns for anti-aircraft defence and two twin-mounted .303 Lewis machine guns, usually sited on bridge wings. For anti-submarine warfare, they mounted two depth charge throwers and initially carried 25 depth charges. The corvettes were designed with a Type 123 ASDIC sonar set installed. The Flower-class ships had a complement of 47 officers and ratings. The Royal Canadian Navy initially ordered 54 corvettes in 1940 and these were fitted with Mark II Oropesa minesweeping gear used for destroying contact mines. Part of the depth charge rails were made portable so the minesweeping gear could be utilised.
Modifications
In Canadian service the vessels were altered due to experience with the design's deficiencies. The galley was moved further back in the ship and the mess and sleeping quarters combined. A direction-finding set was installed and enlarged bilge keels were installed to reduce rolling. After the first 35–40 corvettes had been constructed, the foremast was shifted aft of the bridge and the mainmast was eliminated. Corvettes were first fitted with basic SW-1 and SW-2 CQ surface warning radar, notable for their fishbone-like antenna and reputation for failure in poor weather or in the dark. The compass house was moved further aft and the open-type bridge was situated in front of it. The ASDIC hut was moved in front and to a lower position on the bridge. The improved Type 271 radar was placed aft, with some units receiving Type 291 radar for air search. The minesweeping gear, a feature of the first 54 corvettes, was removed. Most Canadian Flower-class corvettes had their forecastles extended which improved crew accommodation and seakeeping. Furthermore, the sheer and flare of the bow was increased, which led to an enlarged bridge. This allowed for the installation of Oerlikon cannon, replacing the Browning and Vickers machine guns. Some of the corvettes were rearmed with Hedgehog anti-submarine mortars. The complements of the ships grew throughout the war rising from the initial 47 to as many as 104.
Construction and career
Ordered from Saint John Dry Dock and Shipbuilding Co. Ltd. in Saint John, New Brunswick as part of the 1939–1940 Flower-class building programme, Amherst was laid down on 23 May 1940 and launched on 3 December later that year. She was commissioned on 5 August 1941 at Saint John and then sent to Halifax, Nova Scotia to undergo work ups.