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
BYMS-class minesweeper
Country
Production
1941–1943
Quantity
150
Operators
💰 PERFORMANCE / PRICE ASSESSMENT Methodology ↗
MINE COUNTERMEASURES VESSELS (MCM) · WORLD WAR II
4
PERFORMANCE/PRICE
87
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
◎Identification7MOD.7
- Hull Classificationwooden motor minesweeper
- Ship Typeminesweeper
- BuilderGeneral Motors
- Commissioned1943
- Ships in Class150
- Roleminesweeping
- In ServiceYes
◈Displacement & Dimensions5MOD.5
- Light Displacement270 t
- Full Load Displacement274.32 t
- Length41.45 m
- Beam7.47 m
- Draft2.44 m
▣Capacity3MOD.3
- Well DeckNo
- Landing Craft Carried0
- Ro-Ro CapabilityNo
◇Propulsion3MOD.3
- Propulsion Typediesel
- Top Speed15 kn
- Complement (crew)32
◆Aviation4MOD.4
- Embarked Helicopters0
- HangarNo
- Flight DeckNo
- Fixed-Wing / VSTOL0
▤Self-Defense3MOD.3
- Main Gun3" 50 caliber
- Electronic WarfareNo
- Decoy LaunchersNo
⬢Fleet Status3MOD.3
- Completed150
- Under Construction0
- Cancelled0
03 / History
SERVICE LIFESPANStill in Service
- 1941Production started
- 1942Entered service
- 1943Production ended
- 1948Sale: Finland (5 units)
85
years in service
2
years in production
150
units produced
3
countries operating
ⓘ The producing country still actively operates it. 2 countries retired it.
04 / Operators
Operator Countries5country
BYMS-class minesweeperSALES3records
| Year | Buyer | Quantity | Amount | Present Value (2025) |
|---|---|---|---|---|
| 1948 |  Finland | 5 | — | — |
| — |  United Kingdom | 150 | — | — |
| — |  Greece | 25 | — | — |
ⓘ "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 ↗
103MINE COUNTERMEASURES VESSELS (MCM)4WORLD WAR II · MINE COUNTERMEASURES VESSELS (MCM)2336UNITED STATES · ALL WEAPONS28PERFORMANCE/PRICE · MINE COUNTERMEASURES VESSELS (MCM)
ⓘ Rankings are within theMine Countermeasures Vessels (MCM)category.
📚 Sources