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Type 21 Air Radar Kai 2

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No.410 21号対空電探改二
Radar.png Large Radar (Air Radar)
Effects: AA+7 Accuracy+4 Evasion+4 LoS+7
Scrap value: Steel 21 Bauxite 22 (Unbuildable)

Equipment Card Type 21 Air Radar Kai 2.png

Equipment Character Type 21 Air Radar Kai 2.png

Equipment Item Type 21 Air Radar Kai 2.png

Equipment Full Type 21 Air Radar Kai 2.png

Refittable Ship Types
Fast Battleship Battleship
Aviation Battleship Standard Aircraft Carrier
Armored Carrier Light Carrier
Heavy Cruiser Aviation Cruiser
Light Cruiser Torpedo Cruiser
Training Cruiser Destroyer
Coastal Defense Ship Submarine
Aircraft Carrying Submarine Seaplane Tender
Fleet Oiler Submarine Tender
Repair Ship Amphibious Assault Ship



An improved version of an early ship-borne radar.
Although it was designed for anti-air, it can also be used as a surface radar.
Though the smaller and easier to handle Type 13 RADAR was more widely used amongst small ships, the Type 21 RADAR was installed on the aviation cruiser "Mogami" and the Akizuki-class, with this model being a what-if upgrade of that RADAR.


RADAR Radars are used to provide boosts to LoS Line of Sight and accuracy Accuracy. They are additionally used for:

"Dual Purpose Radars" are radars that are both Surface Radars and Air Radars.
Surface RADARSurfaceSurface Radars are radars that:

Air RADARAir Air Radars are radars that:

  • Must have 2 or more AA Anti-Air,
  • Increase the Anti-Air of the fleet,
  • Are required to trigger most AACI.

Can be equipped in the RE of certain ships.


How To Obtain

Upgradeable from: Type 21 Air RadarType 21 Air Radar

From quest: G11

Ranking reward for:

  • Nov 2023: 1-5 (★+8), 6-20 (★+6), 21-100 (★+4)

Updates History

  • 2021-03-30: Implemented

Fit Bonuses

Type 21 Air Radar Kai 2 Equipment Bonuses
Ship Extra Requirement Firepower Torpedo Attack Anti-Air Anti-Submarine Warfare Line of Sight Armor Accuracy Evasion Note
Hatsuzuki Kai NiHatsuzuki Kai Ni (1st equipped) +2 +3 +1 +3 One-time
(1st equipped) +3 +2 +2 One-time[1]
Mogami Kai /Ni /TokuMogami Kai
Mogami Kai Ni
Mogami Kai Ni Toku

Mikuma Kai Ni /TokuMikuma Kai Ni
Mikuma Kai Ni Toku

Other Akizuki-classAkizuki
(1st equipped) +1 +2 +1 +2 One-time
(1st equipped) +3 +2 +2 One-time[1]
  1. 1.0 1.1 Shared with Type 21 Air RadarType 21 Air Radar

Additional synergy with: 20.3cm (No.3) Twin Gun Mount20.3cm (No.3) Twin Gun Mount, 35.6cm Twin Gun Mount Kai 3 (Dazzle Camouflage)35.6cm Twin Gun Mount Kai 3 (Dazzle Camouflage), Prototype 20.3cm (No.4) Twin Gun MountPrototype 20.3cm (No.4) Twin Gun Mount


Radar.png Type 21 Air Radar Kai 2

Improvement Not
★ Improvement
0~5 6~9
Development material Consumed 8/9 11/13
Improvement material Consumed 5/6 6/9
Equipment Card Type 21 Air Radar.png Equipment Card Type 42 Air Radar.png
Resources Fuel10 Ammunition0 Steel40 Bauxite50
Ship Helper Conversion
Ship Banner Mogami Kai Ni.png
Mogami Kai Ni/Toku
Mon Tue Wed Thu Fri Sat Sun
Improvement Improved effects
Large RADARLarge 1★ 2★ 3★ 4★ 5★ 6★ 7★ 8★ 9★ Max★
[math]\displaystyle{ \text{AdjAA}_\text{fleet} }[/math] 1.50 2.12 2.59 3.00 3.35 3.67 3.96 4.24 4.50 4.74
Line of Sight 1.40 1.97 2.42 2.80 3.13 3.42 3.70 3.95 4.20 4.42
Accuracy Day 1.70 2.40 2.94 3.40 3.80 4.16 4.50 4.81 5.10 5.38
Accuracy Night 1.60 2.26 2.77 3.20 3.58 3.92 4.23 4.53 4.80 5.06

See Also