Ship Database
Tier IV Cruiser Premium

Japan

Iwaki Alpha

In the late 1910s, according to the plans for the development of the Japanese Navy, six cruisers based on the improved design of the Tenryū class were supposed to be built. Due to a number of new design solutions, these ships were supposed to receive an additional fifth main battery gun and have their hulls lightened. The project was never implemented,...

Read full ship history

In the late 1910s, according to the plans for the development of the Japanese Navy, six cruisers based on the improved design of the Tenryū class were supposed to be built. Due to a number of new design solutions, these ships were supposed to receive an additional fifth main battery gun and have their hulls lightened. The project was never implemented, but its further development led to the creation of the Kuma-class cruisers.

Doubloons
2,650
Official profile image of Iwaki Alpha

At a glance

The numbers that shape the ship

Hit points
18,600
Maximum speed
35.0 knots
Surface detection
9.8 km
Main battery range
10.7 km
Main battery reload
6.0 s

Combat envelope

Range and detection

Scale: 15 km

Every bar uses the same 15 km scale. Surface detection is a visibility threshold, not a weapon range.

  • Surface detection9.8 km
  • Main battery10.7 km
  • Torpedoes10 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.

  • HE · 140 mm HE Type0 2,400
  • AP · 140 mm Capped Common Shell 2,700
  • Torpedo · Type8 mod. 2 16,266
Handling, concealment and protectionOverview

Handling

Maximum speed
35.0 knots
Turning circle radius
580 m
Rudder shift time
3.8 s
Maneuverability API rating 64

Concealment

Surface detection
9.8 km
Air detection
3.8 km
Submarine detection
3.8 km
Concealment API rating 76

Survivability

Hit points
18,600
Torpedo damage reduction
0 %
Survivability API rating 24

Published armour thickness

Only positive values supplied by the API are shown.

Overall published range
3–63 mm
Weapons and payloadsArmament

Surface armament

Main battery

Artillery API rating 59
Maximum range
10.7 km
Reload time
6.0 s
Rate of fire
10.0 rounds/min
180° turn time
21.2 s
Maximum dispersion
106 m

Shells

Damage is the API's published maximum for one shell hit.

140 mm HE Type0
HE
Maximum damage per hit
2,400
Fire chance
10.0 %
Muzzle velocity
850 m/s
Shell mass
38 kg
140 mm Capped Common Shell
AP
Maximum damage per hit
2,700
Muzzle velocity
850 m/s
Shell mass
38 kg
Gun layout
Mount
140 mm/50 3rd Year Type on a single mount
Mounts
5
Barrels each
1

Automatic armament

Secondary battery

Underwater armament

Torpedoes

Torpedoes API rating 19

Type8 mod. 2

Maximum range
10.0 km
Maximum damage per hit
16,266
Reload time
76 s
Speed
59 knots
Detectability
1.5 km
180° turn time
7.2 s
Torpedo-tube layout
Mount
610 mm Triple
Mounts
2
Tubes each
3

Anti-aircraft defence

AA defence API rating 21
Aura
25 mm/60 Type 96 on a triple mount
Calibre
25 mm
Mounts
5
Modules, hull and progressionTechnical data

Default hull

Hull hit points
18,600
Main-battery barrels
5
Torpedo tubes
2
AA mounts
5

Engine

Published maximum speed
35.0 knots

Fire control

Module research tree

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

Type5 mod. 1

Default
Type
Suo

Propulsion: 68,250 hp

Default
Type
Engine

Iwaki

Default
Type
Hull

140 mm/50 3rd Year Type on a single mount

Default
Type
Artillery

Type8 mod. 2

Default
Type
Torpedoes

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

Main Armaments Modification 1

Modernization

Credits
125,000

Aiming Systems Modification 1

Modernization

Credits
500,000

Main Battery Modification 2

Modernization

Credits
500,000

Damage Control System Modification 1

Modernization

Credits
250,000

Steering Gears Modification 1

Modernization

Credits
1,000,000

Auxiliary Armaments Modification 1

Modernization

Credits
125,000

Aiming Systems Modification 0

Modernization

Credits
125,000

AA Guns Modification 1

Modernization

Credits
500,000
Available module groups
10
Compatible upgrades
10
Upgrade slots
4
Published battle levels
4–5

Cross-nation comparison

Ships that fill a similar slot

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

Italy

Alberto di Giussano

HP
19,300
Speed
36.5 kn
Guns
12.6 km
Torps
8 km
Open comparison

The Netherlands

De Ruyter

HP
21,500
Speed
32 kn
Guns
12.6 km
Open comparison

United Kingdom

Danae

HP
18,400
Speed
30 kn
Guns
11.3 km
Torps
6 km
Open comparison