HMS Onyx (J221)
HMS Onyx (J221) was a turbine engine-powered  during the Second World War. Design and description

The turbine-powered ships displaced  at standard load and  at deep load. The ships measured  long overall with a beam of . The turbine group had a draught of . The ships' complement consisted of 85 officers and ratings. The ships had two Parsons geared steam turbines, each driving one shaft, using steam provided by two Admiralty three-drum boilers. The engines produced a total of  and gave a maximum speed of . They carried a maximum of  of fuel oil that gave them a range of  at . The Algerine class was armed with a QF  Mk V anti-aircraft gun and four twin-gun mounts for Oerlikon 20 mm cannon. The latter guns were in short supply when the first ships were being completed and they often got a proportion of single mounts. By 1944, single-barrel Bofors 40 mm mounts began replacing the twin 20 mm mounts on a one for one basis. All of the ships were fitted for four throwers and two rails for depth charges. Construction and career
The ship was ordered on 15 November 1940 at the Harland & Wolff at Belfast, Northern Ireland. She was laid down on 24 November 1941 and launched on 27 October 1942. The ship was commissioned on 26 March 1943. On 5 April 1967, she was put on the disposal list and sold to BISCO for scrap. References

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Algerine-class minesweepers of the Royal Navy
Ships built in Belfast
1942 ships
World War II minesweepers of the United Kingdom