Data Quality86%
MASS(Military Archive Scoring System)
ⓘ Regardless of era, the same scoring system applies to all units in the patrol boats & fast attack craft category.
01 / Overview
No.4-class submarine chaser
Category
Country
Prime contractor
Production
1937–1939
Quantity
9
Unit Price (current)
$35.3M↗ 2136% inflation · 1937→2025
Original Price
$1.6M (1937)
Operators
💰 PERFORMANCE / PRICE ASSESSMENT Methodology ↗
PATROL BOATS & FAST ATTACK CRAFT · INTERWAR PERIOD
13
PERFORMANCE/PRICE
87
UNIT COST (2025 USD)
$35.3M
Original: $1.6M (1937)
Inflation: +%2136
ⓘ Performance/Price and MASS score are computed across all units in the patrol boats & fast attack craft category, regardless of era.
02 / Specs & Design
◎Identification5MOD.5
- Laid Down1937
- Launched1938
- Commissioned1938
- Ships in Class9
- In ServiceYes
◈Displacement2MOD.2
- Standard Displacement291 t
- Full Load Displacement309 t
▣Dimensions4MOD.4
- Length (overall)56.2 m
- Length (waterline)55.5 m
- Beam5.6 m
- Draft2.1 m
◇Complement1MOD.1
- Total Complement59
◆Propulsion5MOD.5
- Number of Engines2
- Shaft Power1,940 kW
- Shafts / Screws2
- Top Speed20 kn
- Range2,000
▤Gun Armament2MOD.2
- Main Gun Calibre40 mm
- Main Gun Count2
⬢Underwater Warfare3MOD.3
- Torpedo Tubes0
- ASW CapabilityYes
- Hull-Mounted SonarYes
▲Survivability1MOD.1
- Hull Materialsteel
◎Armour1MOD.1
- Armour}}
03 / History
SERVICE LIFESPANStill in Service
- 1937Production started
- 1939First deployment: World War II
89
years in service
2
years in production
9
units produced
1
countries operating
ⓘ The producing country still actively operates it. 1 countries retired it.
05 / MASS Score
PATROL BOATS & FAST ATTACK CRAFT RANKING Patrol Boats & Fast Attack Craft · Interwar Period
MASS RANKINGSMASS ↗
165PATROL BOATS & FAST ATTACK CRAFT13INTERWAR PERIOD · PATROL BOATS & FAST ATTACK CRAFT311JAPAN · ALL WEAPONS8PRICE · PATROL BOATS & FAST ATTACK CRAFT433PRICE · ALL WEAPONS17PERFORMANCE/PRICE · PATROL BOATS & FAST ATTACK CRAFT
ⓘ Rankings are within thePatrol Boats & Fast Attack Craftcategory.
📖 TERMS ON THIS PAGE2terms
Anti-Submarine Warfare. Capability to detect, track, and engage submarines.
Sonar system installed on the hull of a ship, used for underwater detection and navigation by emitting and receiving sound waves.
These terms are listed automatically because they appear on this page.full encyclopedia →
📚 Sources