YMS-1-class minesweeper

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USS YMS-324 in 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[edit]

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

YMS-446 subclass[edit]

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 Lend-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.




  1. ^ a b c Priolo, Gary P. (2006). "Auxiliary Motor Minesweeper (YMS), British Motor Minesweeper (BYMS) Index". NavSource Online. NavSource Naval History. Retrieved 2007-12-20. 
  2. ^ Radigan, Joseph M. (2006). "Ruff (MSC[O] 54), ex-AMS-54, ex-YMS-327". NavSource Online. NavSource Naval History. Retrieved 2007-12-20. 
  3. ^ For both YMS-1 and BYMS classes a total 40 were lost. Of those 40, 32 were YMS-1 class. (See: "YMS class Minesweepers". Uboat.net. Retrieved 2007-12-20. )

External links[edit]