BYMS-class minesweeper

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BYMS 2030
Class overview
Operators	Royal Navy
Built	1941–1943
Completed	150
General characteristics
Type	Minesweeper
Displacement	270 long tons (274 t)
Length	136 ft (41 m)
Beam	24 ft 6 in (7.47 m)
Draught	8 ft (2.4 m)
Propulsion	General Motors 8-268A diesel engines, two shafts
Speed	15 knots (17 mph; 28 km/h)
Complement	32
Armament	1 × 3"/50 caliber gun 2 × 20 mm guns 2 × Depth charge projectors

The BYMS class was a class of wooden motor minesweepers, part of the United States Navy YMS-1 class minesweepers. One hundred fifty ships destined for the United Kingdom were launched from 1941 to 1943.

The initial 80 ships were ordered by the U.S. Navy specifically for transfer to the United Kingdom under the Lend-Lease Programme. On transfer to Britain, BYMS-1 through BYMS-80 were assigned the British pennant numbers BYMS-2001 through BYMS-2080. Names were not assigned to the class members.

A further 53 BYMS vessels bore hull numbers from 137 to 284. These were originally built for the U.S. Navy as part of the YMS-1 class and transferred to Britain on, or shortly after, completion. On the Navy List they were designated BYMS, with their original U.S. Navy numbers. The remaining 17 BYMS vessels were delivered in a final batch.

Dutch BYMS-class minesweepers in 1948.

Calypso[]

Jacques Cousteau's well-known research ship Calypso was originally built by the of Seattle, Washington, United States. She was a BYMS Mark 1-class motor minesweeper, on 12 August 1941 with the yard designation BYMS-26, and launched on 21 March 1942. She was into the Royal Navy in February 1943 as HMS J-826 and assigned to active service in the Mediterranean Sea, redesignated as BYMS-2026 in 1944, laid up at Malta and finally struck from the Naval Register in 1947.

See also[]

• YMS-1 class minesweeper

External links[]

Wikimedia Commons has media related to BYMS class minesweeper.

• YMS/BYMS class ships