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YMS-1-class minesweeper

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Title: YMS-1-class minesweeper  
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Subject: USS Merganser (AMS-26)
Publisher: World Heritage Encyclopedia

YMS-1-class minesweeper

San Francisco Bay, c. 1945–46
Class overview
Name: YMS-1
Builders: 35 yacht builders[1]
Operators:  United States Navy
 Royal Navy
 Royal Canadian Navy
Subclasses: YMS-136, YMS-446
In commission: about March 1942[1] - 13 December 1957[2]
Completed: 481[1]
Cancelled: YMS-482YMS-500
Active: 0
Lost: 32[3]
General characteristics
Type: minesweeper
Displacement: 270 tons
Length: 136 ft (41 m)
Beam: 24 ft 6 in (7.47 m)
Draft: 8 ft (2.4 m)
Propulsion: 2 × 880 bhp General Motors 8-268A diesel engines
2 shafts
Speed: 15 knots (28 km/h)
Complement: 32
Armament: 1 × 3"/50 caliber gun mount
2 × 20 mm guns
2 × depth charge projectors

The YMS-1 class of auxiliary motor minesweepers was established with the laying down of YMS-1 on 4 March 1941.

Characteristics of the class: Displacement 270 t.; Length 136'; Beam 24' 6"; Draft 8'; Speed 15 kts; Complement 32; Armament one single 3"/50 gun mount, two 20mm, two dcp; Propulsion two 440shp General Motors (Cleveland), 8-268A, 2-cycle diesel engines, two shafts.


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 YMSs 135–445, 480, and 481.

YMS-446 subclass

This subclass was also identical but had no stacks, and consisted of YMSs 446–479


Eighty YMS minesweepers were ordered from US yards for transfer under Leand-Lease to the UK as the BYMS-class minesweeper. Another 53 built for the US Navy (hull numbers 137 to 284) were transferred as further BYMS and another 17 were delivered later.


External links

  • Dictionary of American Naval Fighting Ships
  • NavSource Online: Mine Warfare Vessel Photo Archive - YMS-1
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