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Supertest: Pan-Asian Tier IX Cruiser Sejong

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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

TierIX
Health28 800 HP
Torpedo Damage Reduction4 %
Displacement8 530 tons
Dimensions
Overall length180.63 m
Beam17.6 m
Overall height (keel to the highest point on the ship)24.0 m
Freeboard3.1 m
Main Armament
Maximum Firing Range12.046 km
127 mm/54 Mk.18 in a turret6 x 2 127 mm
Torpedo Armament
Maximum Firing Range12.000 km
533 mm Mk314 x 4 533 mm
Maximum speed33.0 knots
Turning Circle Radius670 m
Rudder Shift Time10.8 s
Surface Detectability12.34 km
Air Detectability7.41 km
Detectability After Firing Main Guns in Smoke5.53 km

Main Armament

6 x 2 127 mm/54 Mk.18 in a turret
 Maximum Firing Range12.046 km
 Reloading Time5.25 s
180 Degree Turn Time4.5 s
Optimal firing angles at the front35°
Optimal firing angles at the rear35°
Sigma2.05 sigma
Maximum Dispersion116 m
Shells
Type of Projectile HE – 127 mm HE Mk.41
Alpha Damage1 800
Penetration capacity 21 mm
Explosion size0.44
Fire chance9 %
Projectile Speed808 m/s
Air Drag0.21
Projectile Mass31.75 kg
Type of ProjectileAP – 127 mm AP/SC Mk38 Mod 2
Alpha Damage2 100
Projectile Speed808 m/s
Air Drag0.347
Projectile Mass31.75 kg
Projectile Krupp1 720
Projectile Detonator0.01 s
Detonator threshold21 mm
Ricochet Angles45° – 60°

Torpedo Armament

4 x 4 533 mm Mk31
Mk16 mod. 2
Deepwater: Can only hit cruisers, battleships and aircraft carriers
Reloading Time145 s
Maximum Distance12.000 km
Optimal firing angles at the front40°
Optimal firing angles at the rear30°
Damage17 900
Flooding Chance368%
Speed67 knots
Surface Detectability0.8 km

Anti-air Armament

6 x 2 127 mm/54 Mk.18 in a turret
Sector range0.1 km – 6.0 km
Hit chance90 %
Sector’s damage50
Sector’s damage frequency0.29 s
Sector’s damage per second175
Flak clouds number10
Flak cloud damage1 750
8 x 4 40 mm Bofors on a Mk.2 mount
Sector range0.1 km – 3.5 km
Hit chance90 %
Sector’s damage60
Sector’s damage frequency0.29 s
Sector’s damage per second210
6 x 2 20 mm Oerlikon Mk20
14 x 1 20 mm Oerlikon Mk4
Sector range0.1 km – 2.0 km
Hit chance85 %
Sector’s damage45
Sector’s damage frequency0.29 s
Sector’s damage per second172

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

TierIX
Health29 800 HP
Torpedo Damage Reduction4 %
Displacement9 126 tons
Dimensions
Overall length180.63 m
Beam17.6 m
Overall height (keel to the highest point on the ship)24.0 m
Freeboard3.1 m
Main Armament
Maximum Firing Range13.250 km
127 mm/54 Mk.18 in a turret6 x 2 127 mm
Torpedo Armament
Maximum Firing Range12.000 km
533 mm Mk314 x 4 533 mm
Maximum speed33.0 knots
Turning Circle Radius670 m
Rudder Shift Time7.7 s
Surface Detectability12.34 km
Air Detectability7.41 km
Detectability After Firing Main Guns in Smoke5.53 km

Main Armament

6 x 2 127 mm/54 Mk.18 in a turret
 Maximum Firing Range13.250 km
 Reloading Time5.25 s
180 Degree Turn Time4.5 s
Optimal firing angles at the front35°
Optimal firing angles at the rear35°
Sigma2.05 sigma
Maximum Dispersion124 m
Shells
Type of Projectile HE – 127 mm HE Mk.41
Alpha Damage1 800
Penetration capacity 21 mm
Explosion size0.44
Fire chance9 %
Projectile Speed808 m/s
Air Drag0.21
Projectile Mass31.75 kg
Type of ProjectileAP – 127 mm AP/SC Mk38 Mod 2
Alpha Damage2 100
Projectile Speed808 m/s
Air Drag0.347
Projectile Mass31.75 kg
Projectile Krupp1 720
Projectile Detonator0.01 s
Detonator threshold21 mm
Ricochet Angles45° – 60°

Torpedo Armament

4 x 4 533 mm Mk31
Mk16 mod. 2
Deepwater: Can only hit cruisers, battleships and aircraft carriers
Reloading Time145 s
Maximum Distance12.000 km
Optimal firing angles at the front40°
Optimal firing angles at the rear30°
Damage17 900
Flooding Chance368%
Speed67 knots
Surface Detectability0.8 km

Anti-air Armament

6 x 2 127 mm/54 Mk.18 in a turret
Sector range0.1 km – 6.0 km
Hit chance90 %
Sector’s damage50
Sector’s damage frequency0.29 s
Sector’s damage per second175
Flak clouds number10
Flak cloud damage1 750
8 x 2 76.2 mm/50 Mk.22 on a Mk.33 mount
Sector range0.1 km – 4.0 km
Hit chance90 %
Sector’s damage77
Sector’s damage frequency0.29 s
Sector’s damage per second270
20 x 2 20 mm Oerlikon Mk20
Sector range0.1 km – 2.0 km
Hit chance85 %
Sector’s damage68
Sector’s damage frequency0.29 s
Sector’s damage per second238

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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