Ship Database

Tier VIII Submarine

United Kingdom

Sturdy

Unlike their prewar sisterships, the S-class submarines built during World War II stood out for their extensive use of welding in their construction, as well as their increased fuel capacity. An extra torpedo tube appeared in the light hull. HMS Sturdy was built at Birkenhead between 1942 and 1943. The ship spent most of the war in the Pacific, sinking more than 30 Japanese ships.

Credits: 11,500,000

At a glance

The numbers that shape the ship

Hit points: 12,000
Maximum speed: 25.0 knots
Surface detection: 6.1 km
Torpedo range: 10.0 km
Torpedo reload: 40 s

Combat envelope

Range and detection

Scale: 10 km

Every bar uses the same 10 km scale. Surface detection is a visibility threshold, not a weapon range.

Surface detection6.1 km
Secondary battery5 km
Torpedoes10 km
Sonar ping10 km

Damage comparison

Published maximum per hit

Ship-relative

Bars are normalized only against this ship's highest listed hit. They are not salvo damage, expected damage or DPM.

Torpedo · 533 mm Mk VIII Mod 0* 7,233

Handling, concealment and protectionOverview

Handling

Maximum speed: 25.0 knots
Turning circle radius: 360 m
Rudder shift time: 5.0 s

Maneuverability API rating 44

Concealment

Surface detection: 6.1 km
Air detection: 2.2 km
Submarine detection: 2.2 km

Concealment API rating 95

Survivability

Hit points: 12,000
Torpedo damage reduction: 0 %

Survivability API rating 24

Published armour thickness

Only positive values supplied by the API are shown.

Overall published range: 16–25 mm

Weapons and payloadsArmament

Automatic armament

Secondary battery

Maximum range: 5.0 km

Underwater armament

Torpedoes

Torpedoes API rating 12

533 mm Mk VIII Mod 0*

Maximum range: 10.0 km
Maximum damage per hit: 7,233
Reload time: 40 s
Speed: 75 knots
Detectability: 1.7 km

Torpedo-tube layout

Mount: Torpedo Tubes: Bow Group
Mounts: 6
Tubes each: 1

Mount: Torpedo Tubes: Stern Group
Mounts: 1
Tubes each: 1

Submarine systemsClass system

Dive capacity

Maximum capacity: 280.0
Consumption rate (API value): 1.0
Regeneration rate (API value): 0.6

Dive capacity API rating 37

Underwater handling

Maximum underwater speed: 17 knots
Maximum dive/ascent speed: 3.1 knots
Dive-plane shift time: 11.8 s

Underwater maneuverability API rating 50

Sonar ping

Maximum range: 10.0 km
Ping width (API value): 15
Ping velocity (API value): 500
Reload time (API value): 8.0
Single-sector duration (API value): 25
Double-sector duration (API value): 55

Sonar API rating 50

Modules, hull and progressionTechnical data

Default hull

Hull hit points: 12,000
Secondary barrels: 1
Torpedo tubes: 7

Engine

Published maximum speed: 25.0 knots

Module research tree

Names, research prices and defaults are reported directly by the API.

533 mm Mk VIII

Default

Type: Torpedoes
Purchase: 1,000,000 credits
Next modules: 1

533 mm Mk VIII

Type: Torpedoes
Research: 18,000 XP
Purchase: 2,000,000 credits

Propulsion: 1,550 hp

Default

Type: Engine
Purchase: 1,000,000 credits

ASDIC 8 Mod. A

Default

Type: Sonar
Purchase: 1,000,000 credits
Next modules: 1

ASDIC 8 Mod. B

Type: Sonar
Research: 18,000 XP
Purchase: 2,000,000 credits

Sturdy (A)

Default

Type: Hull
Purchase: 1,500,000 credits
Next modules: 1

Sturdy (B)

Type: Hull
Research: 27,000 XP
Purchase: 3,000,000 credits
Next ships: 1

Compatible upgrades

Official modernization descriptions and listed purchase prices. Effects still depend on the slot and configuration used in game.

Propulsion Modification 1

Modernization

Reduces time to full speed

Credits: 1,000,000

Torpedo Tubes Modification 1

Modernization

Credits: 500,000

Damage Control System Modification 3

Modernization

Credits: 250,000

Main Armaments Modification 1

Modernization

Credits: 125,000

Damage Control System Modification 2

Modernization

Credits: 1,000,000

Torpedo Tubes Modification 3

Modernization

Credits: 2,000,000

Next ships

Research costs published in this ship's official progression data.

Ship: Thrasher
Research cost: 355,000 XP

Available module groups: 10
Compatible upgrades: 6
Researchable next ships: 1
Upgrade slots: 5
Published battle levels: 8–10

Cross-nation comparison

Ships that fill a similar slot

Closest same-tier, same-class matches from other nations, ranked by published base statistics.

Italy

Pietro Micca

HP: 14,600
Speed: 26 kn
Guns: 9.5 km
Torps: 8.5 km

Open comparison

U.S.S.R.

L-20

HP: 13,300
Speed: 29 kn
Guns: 6 km
Torps: 9 km

Open comparison

Germany

U-190

HP: 13,300
Speed: 29 kn
Torps: 12.5 km

Open comparison