Data Quality88%
MASS(Military Archive Scoring System)
ⓘ Regardless of era, the same scoring system applies to all units in the mine countermeasures vessels (mcm) category.
01 / Overview
YMS-1-class minesweeper
Country
Production
1942–
Quantity
481
Operators
💰 PERFORMANCE / PRICE ASSESSMENT Methodology ↗
MINE COUNTERMEASURES VESSELS (MCM) · WORLD WAR II
11
PERFORMANCE/PRICE
94
UNIT COST (2025 USD)
—
ⓘ Performance/Price and MASS score are computed across all units in the mine countermeasures vessels (mcm) category, regardless of era.
02 / Specs & Design
◎Identification4MOD.4
- Ship TypeMinesweeper
- Commissioned1942
- Ships in Class481
- In ServiceYes
◈Displacement & Dimensions5MOD.5
- Light Displacement270 t
- Full Load Displacement270 t
- Length41.45 m
- Beam7.47 m
- Draft2.44 m
▣Propulsion3MOD.3
- Propulsion Type2 × General Motors 8-268A diesel engines
- Top Speed15 kn
- Complement (crew)32
◇Self-Defense2MOD.2
- Main Gun3-inch/50 caliber gun
- CIWSOerlikon 20 mm cannon
◆Fleet Status1MOD.1
- Lost32
03 / History
SERVICE LIFESPANStill in Service
- 1942Production started
- 1947Sale: Poland (3 units)
- 1950Sale: Japan (8 units)
- 1954Sale: Vietnam (3 units)
- 1961Last sale: Madagascar (1 units)
84
years in service
481
units produced
3
countries operating
ⓘ The producing country still actively operates it. 5 countries retired it.
04 / Operators
Operator Countries8country
YMS-1-class minesweeperSALES7records
| Year | Buyer | Quantity | Amount | Present Value (2025) |
|---|---|---|---|---|
| 1961 |  Madagascar | 1 | — | — |
| 1954 |  Vietnam | 3 | — | — |
| 1950 |  Japan | 8 | — | — |
| 1947 |  Poland | 3 | — | — |
| — |  United Kingdom | 80 | — | — |
| — |  France | 31 | — | — |
| — |  Canada | 1 | — | — |
ⓘ "Present Value" is an estimated amount adjusted for inflation.
05 / MASS Score
MINE COUNTERMEASURES VESSELS (MCM) RANKING Mine Countermeasures Vessels (MCM) · World War II
MASS RANKINGSMASS ↗
131MINE COUNTERMEASURES VESSELS (MCM)11WORLD WAR II · MINE COUNTERMEASURES VESSELS (MCM)2451UNITED STATES · ALL WEAPONS1PERFORMANCE/PRICE · MINE COUNTERMEASURES VESSELS (MCM)
ⓘ Rankings are within theMine Countermeasures Vessels (MCM)category.
📚 Sources