6inch Twin Rapid Fire Gun Mount Mk.XXI

6inch Twin Rapid Fire Gun Mount Mk.XXI No.359 6inch 連装速射砲 Mk.XXI
Medium Caliber Main Gun Effects: +5 +1 +1 +3 +2 Medium Scrap Value: 2 3 1

Development
Craftable	Improvable
Refittable Class
Coastal Defense Ship	Destroyer
Light Cruiser	Torpedo Cruiser
Heavy Cruiser	Aviation Cruiser
Battleship	Aviation Battleship
Fast Battleship	Light Carrier
Standard Carrier	Armored Carrier
Seaplane Tender	Submarine Tender
Submarine	Submarine Carrier
Repair Ship	Training Cruiser
Fleet Oiler	Amphibious Assault Ship

Introduction

紅茶の国で開発された中口径主砲です。
紅茶の国の軽巡クラスや、オーストラリア海軍に移籍した同国建造の艦艇などの主兵装として運用されました。
ABDA艦隊の一翼として、南方作戦を展開中の日本艦隊を迎撃したオーストラリア海軍の軽巡もその一隻です。

A medium calibre gun developed by the Country of Tea.
This gun was the main gun of the light cruisers from the Country of Tea and also those that were built there and transferred to the Australian Navy.
One of those Australian Navy light cruisers was part of the ABDA fleet that intercepted the Japanese fleet during the Southern Strategy.

Notes

How To Obtain

Stock equipment of Perth Kai, Perth

Event reward for:

Fall 2019 Event E-3: Hard (★+4), Medium (★+2), Easy

Ranking reward for:

Oct 2019: 1-5 (★+8), 6-20 (★+4), 21-100 (★+2), 101-500 (★+1)

Updates History

2019-11-28: Implemented as ranking reward
2021-03-30: Invisible fit bonuses added

Fit Bonuses

Ship	Extra Requirement								Note
Perth Yuubari Kai Ni		+2		+2				+1
Yuubari		+1		+1				+1

12cm Single Gun Mount (Kai 2) • 12.7cm Twin Gun Mount (Model A • Model A Kai 2 • Model B Kai 2 • Model C Kai 2 • Model D Kai 2 • Model D Kai 3)

Foreign	12.7cm Single Gun Mount (Ger) • 120mm/50 Twin Gun Mount (Mod.1936 • Kai A.mod.1937) (Ita) • QF 4.7inch Gun Mk.XII Kai (UK) • 130mm B-13 Twin Gun Mount (Sov)

Small HA

10cm Twin HA Gun Mount (+ AAFD) • 12cm Single High-angle Gun Mount (Model E) • 12.7cm HA Gun Mount (Single LM • Twin LM • Single Kai 2 • Twin Kai 2) • 12.7cm Twin HA Gun Mount (Model A Kai 3 + AAFD • Model B Kai 4 + AAFD)

Foreign	5inch Single Gun Mount Mk.30 (Mk.30 Kai • Mk.30 Kai + GFCS) (US) • Local Mod. 12.7cm Twin HA Gun Mount (CN) • Local Mod. 10cm Twin HA Gun Mount (CN)

Medium

14cm	14cm Single Gun Mount • 14cm Twin Gun Mount (Kai)

15.2cm/6inch	15.2cm Twin Gun Mount (Kai • Kai 2) • 15.5cm Triple Gun Mount (Kai) • 152mm/55 Triple Rapid Fire Gun Mount (Kai) (Ita) • 6inch Triple Rapid Fire Gun Mount Mk.16 (Mk.16 mod.2) (US) • 6inch Mk.XXIII Triple Gun Mount (UK) • Bofors 15.2cm Twin Gun Mount Model 1930 (Swe) • Bofors 15cm Twin Rapid Fire Gun Mount Mk.9 Model 1938 (Mk.9 Kai + Single Mk.10 Kai) (NL) • 6inch Twin Rapid Fire Gun Mount Mk.XXI (AU)

20.3cm/8inch	20.3cm Twin Gun Mount (No.2 • No.3) • SKC34 20.3cm Twin Gun Mount (Ger) • 203mm/53 Twin Gun Mount (Ita) • 8inch Triple Gun Mount Mk.9 (Mk.9 mod.2) (US)

Medium HA

5inch Twin DP Gun Mount (CD) (+ GFCS) (US)

Large

30.5cm	30.5cm Triple Gun Mount (Kai) (Sov)

35.6cm	35.6cm Twin Gun Mount (Dazzle Camo • Kai • Kai 2) • Prototype 35.6cm Triple Gun Mount • 35.6cm Triple Gun Mount Kai (Dazzle Camouflage)

38cm	38cm Twin Gun Mount (Kai) (Ger) • 381mm / 50 Triple Gun Mount (Kai) (Ita) • 38.1cm Mk.I Twin Gun Mount (Mk.I/N Kai) (UK) • 38cm Quad Gun Mount (Kai) (Fr)

41cm/16inch	41cm Twin Gun Mount (Kai 2) • 41cm Triple Gun Mount (Proto • Kai • Kai 2) • 16inch Twin Gun Mount (Mk.I • Mk.V • Mk.VIII Kai) (US) • 16inch Triple Gun Mount (Mk.6 • Mk.6 + GFCS • Mk.6 mod.2 • Mk.7 • Mk.7 + GFCS) (US) • 16inch Triple Gun Mount (Mk.I • Mk.I + AFCT Kai • Mk.I Kai + FCR Type 284) (UK)

46cm and 51cm	Prototype 46cm Twin Gun Mount • 46cm Triple Gun Mount (Kai) • 51cm Twin Gun Mount (Proto)

Secondary Guns

Surface

15.2cm Single Gun Mount • 15.5cm Triple Gun Mount (Kai) • 15cm Twin Gun Mount (Ger) • OTO 152mm Triple Rapid Gun Mount (Ita) • 15.2cm Triple Gun Mount (Fr)

High-Angle

8cm High-angle Mount (+ Add. Machineguns) • 10cm Twin High-angle Carriage Mount (Kai + Add. Machineguns) • 12.7cm Twin High-angle Mount (+ AAFD)

Foreign	10.5cm Twin Gun Mount (Ger) • 90mm Single HA Gun Mount (Ita) • 5inch Single High-angle Gun Mount Battery (US) • 5inch Twin Gun Mount Mk.28 mod.2 (US)

Anti-Air

Anti-Air Guns	7.7mm Machinegun • 12.7mm Machinegun • 25mm Autocannon Mount (Single • Twin • Triple • Triple CD) • BI-type 40mm Twin Machine Gun • 12cm 30-tube Rocket Launcher (Kai 2) • 2cm Flakvierling 38 (Ger) • 3.7cm FlaK M42 (Ger) • Bofors 40mm Quadruple Autocannon Mount (Swe/US) • QF 2-pounder Octuple "Pom Pom" Naval Gun Mount (UK) • 20 Tube 7 Inch UP Rocket Launcher (UK)

Anti-Aircraft Fire Directors	Type 91 AAFD • Type 94 AAFD

Torpedo Weapon

Surface	53cm Twin Torpedo Mount • 53cm Hull-mounted O2 Torpedoes • 61cm Torpedo Mount (Triple • Triple O2 • Triple O2 LM • Quad • Quad O2 • Quad O2 LM • Quint O2 • Proto Sext O2) • 533mm Quint Torpedo Mount (Initial Model • Late Model) (US) • 533mm Triple Torpedo Mount (Model 53-39) (Sov)

Submarine	Late Model Bow Torpedo Mount (6 Tubes) (+ Skilled SONAR Personnel) • 53cm Submarine Bow Torpedo Mount (8 tubes) (Late Model) • Prototype FaT Type 95 Oxygen Torpedo Kai (IJN/Ger)

Midget Submarines	Kouhyouteki (Type A • Type C • Type D Kai)

Carrier-Based Aircraft

Fighters

Type 0	Model 21 (Skilled) • Model 32 (Skilled) • Model 52 (Skilled) • Model 52C (601) • Model 21 (Iwamoto) • Model 52A (Iwamoto) • Model 53 (Iwamoto) • Model 52C (Iwai)

Other (IJN)	Type 96 (Kai) • Shiden (Kai 2 • Kai 4) • Reppuu (Prototype LM • Model 11 • 601 • Kai • Kai 2 • Kai 2 (CD1/Skilled)) • Shinden Kai

Foreign	Bf109 T Kai (Ger) • Fw190 (T Kai • A-5 Kai (Skilled)) (Ger) • Reggiane (Re.2001 OR Kai • Re.2005 Kai) (Ita) • Wildcat (F4F-3 • F4F-4) (US) • Hellcat (F6F-3 • F6F-5) (US) • XF5U (US) • Fulmar (UK) • Seafire Mk.III Kai (UK)

Night	Reppuu Kai 2 Model E (CD1/Skilled) • Hellcat (F6F-3N • F6F-5N) (US)

Torpedo Bombers

Type 97 (Skilled • 931 • 931/Skilled • Tomonaga • Murata) • Tenzan (601 • 931 • Model 12A • Tomonaga • Murata) • Ryuusei (Kai • 601 • CD1 • CD1/Skilled)

Foreign	Re.2001 G Kai (Ita) • TBD (US) • TBF (US) • Swordfish (Mk.II Skilled • Mk.III Skilled) (UK)

Night	Type 97 Model E (Skilled) • Tenzan Model 12A Kai (Skilled) • TBM-3D (US) • TBM-3W+3S (JMSDF/US)

Dive Bombers

Type 99 (Skilled • Model 22 • Model 22/Skilled • Egusa) • Suisei (601 • Model 12A (w/ Cluster Bombs • w/ Photo Fuze Bombs) • Model 22 (634 • 634/Skilled) • Egusa) • Type 0 Model 62 FB (Iwai) • Type 0 Model 63 FB • Prototype Nanzan

Foreign	Ju.87C (Kai • Kai 2 KMX • Kai 2 KMX / Skilled) (Ger) • Re.2001 CB Kai (Ita) • SBD (US) • FM-2 (US) • F4U-1D (US) • Skua (UK)

Recon

Saiun (4th Recon • East Caroline) • Type 2 • Prototype Keiun

Jets

Jet Keiun Kai • Kikka Kai

Land-Based Aircraft

Attack Aircraft

Type 96 • Type 1 (Model 22A • Model 34 • Nonaka) • Ginga (Egusa) • Type 1 Hayabusa Model III Kai (65) (IJA) • Type 4 Heavy Bomber Hiryuu (Skilled) (IJA) • Do 17 Z-2 (Ger) • Do 217 (E-5 + Hs293 • K-2 + Fritz-X) (Ger)

Anti-Submarine	Toukai (Proto • 901)

Heavy	Shinzan (Kai)

Fighters

Type 1 FIghter Hayabusa (Model II • Model II (64) • Model IIIA • Model IIIA (54)) (IJA) • Type 3 Fighter Hien (Model 1D • 244) (IJA) • Type 4 Fighter Hayate (IJA) • Fw 190 D-9 (Ger) • Spitfire (Mk.I • Mk.V • Mk.IX Skilled) (UK)

Interceptors	Raiden • Shiden (Model 11 • Kai • Kai 343) • Reppuu Kai (352/Skilled)

HA Interceptors	Me 163B (Ger) • Shuusui (Proto)

Recon

Type 2 Recon (Skilled)

Seaplanes

Fighter	Type 2 Kai (Skilled) • Kyoufuu Kai • Ro.44 Seaplane Fighter (Bis) (Ita)

Bomber/Multirole	Zuiun (631 • 634 • 634/Skilled • Model 12 • Model 12 (634) • Kai 2 (634) • Kai 2 (634/Skilled)) • Seiran (Prototype • 631) • Swordfish (Mk.III Kai • Mk.III Kai Skilled) (UK) • Laté 298B (Fr)

Recon	Type 0 Recon Seaplane (Model 11B • Model 11B Skilled) • Type 0 Observation Seaplane • Type 98 Night Recon Seaplane • Shiun • Ar196 Kai (Ger) • Ro.43 Recon Seaplane (Ita) • OS2U (US) • Swordfish Mk.II Kai (UK) • Fairey Seafox Kai (UK/Swe) • S9 Osprey (Swe)

Flying Boats	Type 2 Flying Boat • PBY-5A Catalina (US)

Radar

Small Radars	Type 13 Air Radar (Kai) • Type 22 Surface Radar (Kai 4 • Kai 4 Calibrated LM) • Type 33 Surface Radar • SG Radar (Initial Model) (US) • GFCS Mk.37 (US)

Large Radars	Type 21 Air Radar (Kai • Kai 2) • Type 32 Surface Radar (Kai) • Type 42 Air Radar (Kai 2) • 15m Duplex Rangefinder + Type 21 Radar Kai 2 • FuMO25 Radar (Ger) • SK Radar (+ SG) (US)

Submarine Radars	Submarine Radar and Waterproof Periscope • Submarine Radar and Radio Direction Finder (E27) • Late Model Submarine Radar & Passive Radiolocator

Anti-Submarine Warfare

Depth Charge Projectors

Type 94 Depth Charge Launcher • Type 3 Depth Charge Projector (Concentrated Deployment) • Type 2 12cm Mortar Kai (Concentrated Deployment)

Special	Prototype 15cm Nonuple ASW Rocket Launcher • RUR-4A Weapon Alpha Kai (US) • Lightweight ASW Torpedo (Initial Test Model) (US)

Depth Charges

Type 95 Depth Charge • Type 2 Depth Charge

Sonars

Type 93 SONAR • Type 3 SONAR • Type 0 Passive SONAR • Type 4 SONAR • ASDIC (Type 124 • Type 144/147 • Type 144/147 + HF/DF) (UK)

ASW Planes

Type 3 Spotter/Liaison

Rotorcraft

Ka Type Observation Autogyro • O Type Observation Autogyro (Kai • Kai 2) • S-51J (Kai)

Miscellaneous

Anti-Installation

WG42 (Wurfgerät 42) (Ger) • Type 4 20cm Anti-ground Rocket Launcher (Concentrated Deployment)

Shells

Type 91 AP Shell • Type 1 AP Shell (Kai) • Type 3 Shell (Kai)

Engine

Improved Steam Turbine • Enhanced Steam Boiler • New High Pressure-Temperature Steam Boiler

Landing Craft

Daihatsu Landing Craft (+ Type 89 & Landing Force • Armed) • Toku Daihatsu Landing Craft (+ 11th Tank Regiment) • Soukoutei (AB-Class) (IJA) • M4A1 DD (US)

Tank	Type 2 Ka-Mi Tank

Armor

Anti-Torpedo Bulge (Medium • Large) • New Kanhon Design Anti-Torpedo Bulge (Medium • Large) • Pugliese-Type Underwater Bulkhead (Ita) • Arctic camouflage (+ Arctic equipment)

Night Battle Aid

Searchlight • Type 96 150cm Searchlight • Star Shell

Facility and Crew

Ship Repair Facility • Skilled Lookouts • Fleet Command Facility (Striking Force) • Skilled Carrier-based Aircraft Maintenance Personnel • Night Operation Aviation Personnel (+ Skilled Deckhands) • Arctic Gear & Deck Personnel

Consumables

Repair Team • Repair Goddess • Combat Ration (Special Onigiri) • Canned Saury • Underway Replenishment

Other

Drum Canister • Saiun (Disassembled for Transport)

Removed

SB2U

HA - High-Angle; DP - Dual-Purpose; LM - Late Model; CD - Concentrated Deployment or Carrier Division

6inch Twin Rapid Fire Gun Mount Mk.XXI

Introduction

Notes

How To Obtain

Updates History

Fit Bonuses

See Also

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