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Supertest: Pan-Asian Tier IX Cruiser Sejong

5 min read

Historical background

The Sejong is quite possibly based on a mix between two designs. The first one is a 7 500 tons design of light cruiser from 1939 and armed with twelve 127 mm/54 guns in six twin turrets.

The second one is an AA cruiser preliminary design (S-511-66: “5”/54 Cal. Cruiser – Scheme “C”). This design was calling for an 8 550 tons light cruiser armed with new 127 mm/54 guns in twin turrets equipped with a new auto-loading system and was the basis for the CL-154 class. It was, however, abandoned in March 1945.

The ship is a modified version of this design, being equipped with four quadruple torpedo launchers.

The ship is named after Sejong the Great, the fourth king of the Joseon dynasty of Korea.

Ship’s preview

Camouflage

For the classic reminder, this is a ship in testing, anything can change so don’t look at her like she would already be released.

Modules

Hull
Engine
Gun Fire Control System
Main battery
Torpedoes

icon_module_Hull_installed

Sejong (A)

icon_module_Engine_installed

Propulsion: 90 000 HP

icon_module_Suo_installed

‎‎Mk 9 mod. 1

icon_module_Artillery_installed

127 mm/54 Mk.18 in a turret

icon_module_Torpedoes_installed

Mk16 mod. 2

icon_module_Hull_installed

Sejong (B)

icon_module_Suo_installed

‎‎Mk 9 mod. 2

Stock Ship

General Characteristics

Tier IX
Health 28 800 HP
Torpedo Damage Reduction 4 %
Displacement 8 530 tons
Dimensions
Overall length 180.63 m
Beam 17.6 m
Overall height (keel to the highest point on the ship) 24.0 m
Freeboard 3.1 m
Main Armament
Maximum Firing Range 12.046 km
127 mm/54 Mk.18 in a turret 6 x 2 127 mm
Torpedo Armament
Maximum Firing Range 12.000 km
533 mm Mk31 4 x 4 533 mm
Maximum speed 33.0 knots
Turning Circle Radius 670 m
Rudder Shift Time 10.8 s
Surface Detectability 12.34 km
Air Detectability 7.41 km
Detectability After Firing Main Guns in Smoke 5.53 km

Main Armament

6 x 2 127 mm/54 Mk.18 in a turret
 Maximum Firing Range 12.046 km
 Reloading Time 5.25 s
180 Degree Turn Time 4.5 s
Optimal firing angles at the front 35°
Optimal firing angles at the rear 35°
Sigma 2.05 sigma
Maximum Dispersion 116 m
Shells
Type of Projectile  HE – 127 mm HE Mk.41
Alpha Damage 1 800
Penetration capacity  21 mm
Explosion size 0.44
Fire chance 9 %
Projectile Speed 808 m/s
Air Drag 0.21
Projectile Mass 31.75 kg
Type of Projectile AP – 127 mm AP/SC Mk38 Mod 2
Alpha Damage 2 100
Projectile Speed 808 m/s
Air Drag 0.347
Projectile Mass 31.75 kg
Projectile Krupp 1 720
Projectile Detonator 0.01 s
Detonator threshold 21 mm
Ricochet Angles 45° – 60°

Torpedo Armament

4 x 4 533 mm Mk31
Mk16 mod. 2
Deepwater: Can only hit cruisers, battleships and aircraft carriers
Reloading Time 145 s
Maximum Distance 12.000 km
Optimal firing angles at the front 40°
Optimal firing angles at the rear 30°
Damage 17 900
Flooding Chance 368%
Speed 67 knots
Surface Detectability 0.8 km

Anti-air Armament

6 x 2 127 mm/54 Mk.18 in a turret
Sector range 0.1 km – 6.0 km
Hit chance 90 %
Sector’s damage 50
Sector’s damage frequency 0.29 s
Sector’s damage per second 175
Flak clouds number 10
Flak cloud damage 1 750
8 x 4 40 mm Bofors on a Mk.2 mount
Sector range 0.1 km – 3.5 km
Hit chance 90 %
Sector’s damage 60
Sector’s damage frequency 0.29 s
Sector’s damage per second 210
6 x 2 20 mm Oerlikon Mk20
14 x 1 20 mm Oerlikon Mk4
Sector range 0.1 km – 2.0 km
Hit chance 85 %
Sector’s damage 45
Sector’s damage frequency 0.29 s
Sector’s damage per second 172

Consumable

Slot 1
Slot 2
Slot 3
Slot 4
Slot 5
Damage Control Party
Work time: 5 s
Cooldown: 60 s
Defensive AA Fire

Number of charges: 3
Work time: 40 s
Cooldown: 80 s
Damage from continuous DPS: +50%
Damage from flak explosions: +300%
Torpedo Reload Booster

Number of charges: 2
Work time: 1 s
Cooldown: 300 s
Torpedo reload time: 8 s
Repair Party
Number of charges: 3
Work time: 28 s
Cooldown: 80 s
HP regeneration: 0.5%/s
Casemate damage regeneration: 50%
Citadel damage regeneration: 50%
Smoke Generator

Number of charges: 3
Work time: 30 s
Cooldown: 100 s
Smoke radius: 450 m
Smoke duration: 70 s

Fully Upgraded Ship

General Characteristics

Tier IX
Health 29 800 HP
Torpedo Damage Reduction 4 %
Displacement 9 126 tons
Dimensions
Overall length 180.63 m
Beam 17.6 m
Overall height (keel to the highest point on the ship) 24.0 m
Freeboard 3.1 m
Main Armament
Maximum Firing Range 13.250 km
127 mm/54 Mk.18 in a turret 6 x 2 127 mm
Torpedo Armament
Maximum Firing Range 12.000 km
533 mm Mk31 4 x 4 533 mm
Maximum speed 33.0 knots
Turning Circle Radius 670 m
Rudder Shift Time 7.7 s
Surface Detectability 12.34 km
Air Detectability 7.41 km
Detectability After Firing Main Guns in Smoke 5.53 km

Main Armament

6 x 2 127 mm/54 Mk.18 in a turret
 Maximum Firing Range 13.250 km
 Reloading Time 5.25 s
180 Degree Turn Time 4.5 s
Optimal firing angles at the front 35°
Optimal firing angles at the rear 35°
Sigma 2.05 sigma
Maximum Dispersion 124 m
Shells
Type of Projectile  HE – 127 mm HE Mk.41
Alpha Damage 1 800
Penetration capacity  21 mm
Explosion size 0.44
Fire chance 9 %
Projectile Speed 808 m/s
Air Drag 0.21
Projectile Mass 31.75 kg
Type of Projectile AP – 127 mm AP/SC Mk38 Mod 2
Alpha Damage 2 100
Projectile Speed 808 m/s
Air Drag 0.347
Projectile Mass 31.75 kg
Projectile Krupp 1 720
Projectile Detonator 0.01 s
Detonator threshold 21 mm
Ricochet Angles 45° – 60°

Torpedo Armament

4 x 4 533 mm Mk31
Mk16 mod. 2
Deepwater: Can only hit cruisers, battleships and aircraft carriers
Reloading Time 145 s
Maximum Distance 12.000 km
Optimal firing angles at the front 40°
Optimal firing angles at the rear 30°
Damage 17 900
Flooding Chance 368%
Speed 67 knots
Surface Detectability 0.8 km

Anti-air Armament

6 x 2 127 mm/54 Mk.18 in a turret
Sector range 0.1 km – 6.0 km
Hit chance 90 %
Sector’s damage 50
Sector’s damage frequency 0.29 s
Sector’s damage per second 175
Flak clouds number 10
Flak cloud damage 1 750
8 x 2 76.2 mm/50 Mk.22 on a Mk.33 mount
Sector range 0.1 km – 4.0 km
Hit chance 90 %
Sector’s damage 77
Sector’s damage frequency 0.29 s
Sector’s damage per second 270
20 x 2 20 mm Oerlikon Mk20
Sector range 0.1 km – 2.0 km
Hit chance 85 %
Sector’s damage 68
Sector’s damage frequency 0.29 s
Sector’s damage per second 238

Consumable

Slot 1
Slot 2
Slot 3
Slot 4
Slot 5
Damage Control Party
Work time: 5 s
Cooldown: 60 s
Defensive AA Fire

Number of charges: 3
Work time: 40 s
Cooldown: 80 s
Damage from continuous DPS: +50%
Damage from flak explosions: +300%
Torpedo Reload Booster

Number of charges: 2
Work time: 1 s
Cooldown: 300 s
Torpedo reload time: 8 s
Repair Party
Number of charges: 3
Work time: 28 s
Cooldown: 80 s
HP regeneration: 0.5%/s
Casemate damage regeneration: 50%
Citadel damage regeneration: 50%
Smoke Generator

Number of charges: 3
Work time: 30 s
Cooldown: 100 s
Smoke radius: 450 m
Smoke duration: 70 s

The Armor

External armor protection:

Front and rear armor protection of the middle section:

Citadel armor protection:

Turrets armor protection:

Personal Opinion

The ship looks fairly solid on paper with good DPM and that sweet 32 mm side armor to protect her from battleship AP and HE from light cruisers and destroyers.

The torpedo armament also definitely looks nice with a bit more than 2.3 km of buffer zone to torpedo enemy ships from stealth. With the reload booster on top, that’s a theoretical 32 torpedoes in the water in a short time. Quite nice to demolish a troublesome battleship.

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