Type 21 Air Radar

[Edit] Type 21 Air Radar No.30 21号対空電探
Large Radar (Air Radar) Effects: +4 +2 +4 Scrap value: 20 20 (Buildable)
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

Introduction

初の実用艦載電探です。
対空用ですが、対水上電探としても使用可能です。
13号電探と混載することも可能で、基本的にこの21号は大型艦に搭載されました。

This is the first practical ship-borne radar.
Primarily tasked for air search, it can also be used for surface search.
While it could be used in conjunction with the Type 13 radar, the Type 21 was basically used aboard larger warships.

Mechanics

Radars are used to provide boosts to LoS and accuracy . They are additionally used for:

• Certain Artillery Spotting,
• Certain Night Cut-Ins,
• Maelstrom resource loss mitigation,

Air Air Radars are radars that:

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

Notes

How To Obtain

Buildable:

Best craft recipe	10	10	200	201	Akizuki-classSecretary: Akizuki-class Akizuki-class	AviationShips with special crafting will have reduced rates of other specific equipment Especially Akitsu Maru & Shinshuu MaruSecretary: Category Aviation Ship Types included: CAV, CVL, BBV, CV, AV, LHA, CVB

Stock equipment of: Abukuma Kai, Chikuma Kai Ni, Hiei Kai Ni, Isuzu Kai Ni, Isuzu Kai, Junyou Kai Ni, Kinu Kai, Kirishima Kai Ni, Kitakami Kai Ni, Kongou Kai Ni, Maya Kai, Mikuma Kai, Naka Kai Ni, Ooi Kai Ni, Suzuya Kai, Tone Kai Ni, Yahagi Kai

From quest: C56 (choice), Cy9 (x2, choice)

Uses

Used to improve: Type 13 Air Radar, Type 21 Air Radar, Type 42 Air Radar, Type 21 Air Radar Kai, SK Radar, Type 21 Air Radar Kai Ni, 15m Duplex Rangefinder + Type 21 Radar Kai Ni, FuMO25 Radar

Used by quest: F124

Updates History

• 2013-04-23: Implemented with initial game release
• 2015-06-12: Became improvable and upgradeable to Type 21 Air Radar Kai
• 2021-03-30: Became upgradeable to Type 21 Air Radar Kai Ni, build rate with Akizuki-class increased, visible bonuses added

Fit Bonuses

Type 21 Air Radar Equipment Bonuses
Ship	Extra Requirement									Note
Mogami Kai /Ni /Toku Mikuma Kai Ni /Toku Akizuki-class	(1st equipped)			+3		+2			+2	One-time

Additional synergy with: 20.3cm (No.3) Twin Gun Mount, Prototype 20.3cm (No.4) Twin Gun Mount

Improvement

Type 21 Air Radar
Improvement			→	Conversion (helper-dependent)
★ Improvement Level	0~5	6~9		Type 21 Air Radar Kai	Type 21 Air Radar Kai 2
Consumed	5/6	6/8		12/16	20/28
Consumed	2/3	3/5		5/13	7/15
Equipment Consumed	-			x2
Items Consumed	-			-
Resources	10 0 40 50

Ship Helper Conversion Ise/Kai Ni Type 21 Air Radar Kai Mon Tue Wed Thu Fri Sat Sun Ise Kai Mon Tue Wed Thu Fri Sat Sun Hyuuga Mon Tue Wed Thu Fri Sat Sun Hyuuga Kai Mon Tue Wed Thu Fri Sat Sun Hyuuga Kai Ni does not work

Ship Helper Conversion Mogami/Kai Type 21 Air Radar Kai 2 Mon Tue Wed Thu Fri Sat Sun Mogami Kai Ni Toku Mon Tue Wed Thu Fri Sat Sun Mogami Kai Ni does not work

Improvement effects
Large	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
	1.40	1.98	2.42	2.80	3.13	3.43	3.70	3.96	4.20	4.43
Day	1.00	1.41	1.73	2.00	2.23	2.44	2.64	2.82	3.00	3.16
Night	1.30	1.84	2.25	2.60	2.91	3.18	3.44	3.68	3.90	4.11

See Also

• 二式二号電波探信儀一型