YMS-1-class minesweeper


The YMS-1 class of auxiliary motor minesweepers was established with the laying down of YMS-1 on 4 March 1941. Some were later transferred to the United Kingdom as part of the Second World War Lend-Lease pact between the two nations. One ship eventually made its way into the Royal Canadian Navy postwar.

Design

The design for the class had a displacement of 270 tonnes. The ships had a length of, a beam of, and a draft of. The vessels were capable of, being powered by two General Motors 8-268A, 2-cycle diesel engines which drove two shafts.
The ships had a complement of 32. Their armament comprised one single 3-inch/50 caliber gun mount, two 20 mm anti-aircraft guns and two depth charge projectors.

Subclasses

There were two mostly cosmetic sub-types of the class, sometimes referred to as classes themselves

''YMS-135'' subclass

This subclass was identical but had only one stack rather than two, and consisted of YMS-135, YMS-445, YMS-480, and YMS-481.

''YMS-446'' subclass

This subclass was also identical but had no stacks, and comprised YMS 446–YMS 479.

BYMS

Eighty vessels of the class were ordered from US yards for transfer under Lend-Lease to the United Kingdom as the BYMS-class minesweeper. Another 53 built for the US Navy were transferred as further BYMS and another 17 were delivered later.

Other exports

France received 31 YMS-class minesweepers during World War 2, with one being sunk by a mine in 1944. France kept its YMS-class ships in service after the end of the war, with seven remaining in service in 1962, used as training ships in the École Navale and as experimental vessels. Three ships of the class were transferred from France to South Vietnam in 1954, while another was transferred to Madagascar in 1961.

Examples