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

Ship Extra Requirement Firepower Torpedo Attack Anti-Air Anti-Submarine Warfare Line of Sight Armor Evasion Note
Mogami Kai/Ni/TokuMogami Kai
Mogami Kai Ni
Mogami Kai Ni Toku

+1 +5 +2 +1 +4 Non-stackable between itself and Type 21 Air Radar


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