Ki-21-Ia

Ki-21-Ia

Ki-32

H6K4

Ki-21-Ia

Ki-32

H6K4

Japan

I Rank

Battle rating:

AB	RB	SB
2.0	1.7	1.7

Class:

Bomber

Frontline bomber

Research:4 000

Purchase:2 100

Show in game

This page is about the Japanese bomber Ki-21-Ia. For the gift version, see Ki-21-I hei.

Description

The Ki-21-Ia is a rank I Japanese bomber with a battle rating of 2.0 (AB) and 1.7 (RB/SB). It was introduced in Update 1.49 "Weapons of Victory".

The Ki-21-Ia's role is a low-altitude medium bomber capable of destroying ground targets such as pillboxes and tanks. Although hindered by a low total bomb capacity, this aircraft is renowned for its impressive manoeuvrability. This being said, it is very easy for the Ki-21 to hover above an area and drop all of its payload rather quickly. The main targets of this bomber should be ground targets. The preferred naval targets of this plane should be destroyers and cargo ships, do not try to attack large vessels like carriers and battleships as your weak payload would not be strong enough to sink the vessel.

With light turret armament, the Ki-21 is a plane that would probably perform its role as a bomber best at higher altitudes. The different bomb layouts on the plane add a degree of versatility, with the 20 x 50 kg bombs allowing the plane to take out a lot of ground targets effectively. Though, if the plane were dragged into higher rank matches the bomb load would be pretty ineffective against ground vehicles and wouldn't be very efficient against bases. For bases, naturally the best payload option would be the 2 x 500 kg bombs. For an early-rank bomber, it does its job well and though it lumbers through the air from time to time, it is much more manoeuvrable than the other Japanese equivalent at this rank, the H6K4.

General info

Flight performance

Max speed

at 400 m432 km/h

Turn time14 s

Max altitude8 600 m

Engine2 х Nakajima Ha-5

TypeRadial

Cooling systemAir

Take-off weight8 t

Characteristics	Max Speed (km/h at 400 m)		Max altitude (metres)	Turn time (seconds)		Rate of climb (metres/second)		Take-off run (metres)
	AB	RB		AB	RB	AB	RB
Stock	413	398	8600	14.7	15.2	3.1	3.1	600
Upgraded	454	432		13.6	14.0	9.8	5.9

Details

Features
Combat flaps	Take-off flaps	Landing flaps	Air brakes	Arrestor gear
✓	✓	✓	X	X

Limits
Wings (km/h)	Gear (km/h)	Flaps (km/h)			Max Static G
		Combat	Take-off	Landing	+	-
540	380	450	450	250	~7	~2

Optimal velocities (km/h)
Ailerons	Rudder	Elevators	Radiator
< 260	< 260	< 260	> 320

Compressor (RB/SB)
Setting 1
Optimal altitude	100% Engine power	WEP Engine power
3,700 m	890 hp	1,080 hp

Survivability and armour

Crew5 people

Speed of destruction

Structural540 km/h

Gear380 km/h

• No armour
• Self-sealing fuel tanks (2 in each wing, 2 in the mid-fuselage)

Modifications and economy

Repair costBasic → Reference

AB239 → 301

RB340 → 428

SB482 → 607

Total cost of modifications4 430

2 690

Talisman cost300

Crew training600

Experts2 100

Aces45

Research Aces110 000

Reward for battleAB / RB / SB

20 / 40 / 80 %

100 / 100 / 100 %

Modifications

Flight performance	Survivability	Weaponry
Fuselage repair Research: 220 Cost: 135 45 Radiator Research: 220 Cost: 135 45 Compressor Research: 330 Cost: 200 70 Wings repair Research: 280 Cost: 170 60 Engine Research: 280 Cost: 170 60 Engine injection Research: 480 Cost: 290 100	Airframe Research: 330 Cost: 200 70 Cover Research: 480 Cost: 290 100	bmg303_turret_belt_pack Research: 220 Cost: 135 45 12 in (mod30) Research: 220 Cost: 135 45 vikkersK_turret_new_gun Research: 330 Cost: 200 70 type97_turret_belt_pack Research: 280 Cost: 170 60 14 in (mod30) Research: 280 Cost: 170 60 type89_turret_new_gun Research: 480 Cost: 290 100

Armaments

Suspended armament

List of setups (4)

Setup 120 x 50 kg Army Type 94 GPHE bomb

Setup 210 x 100 kg Army Type 94 GPHE bomb

Setup 34 x 250 kg Army Type 92 GPHE bomb

Setup 42 x 500 kg Army Type 92 GPHE bomb

The Ki-21-Ia can be outfitted with the following ordnance:

• 20 x 50 kg Army Type 94 GPHE bombs (1,000 kg total)
• 10 x 100 kg Army Type 94 GPHE bombs (1,000 kg total)
• 4 x 250 kg Army Type 92 GPHE bombs (1,000 kg total)
• 2 x 500 kg Army Type 92 GPHE bombs (1,000 kg total)

Defensive armament

2 х Turret7.7 mm Te-1 machine gun

Ammunition483 rounds

Fire rate950 shots/min

Turret2 x 7.7 mm Type 89 machine gun 'special'

Ammunition900 rounds

Fire rate700 shots/min

The Ki-21-Ia is defended by:

• 2 x 7.7 mm Type 89 special army machine guns, dorsal turret (450 rpg = 900 total)
• 1 x 7.7 mm Te-1 army machine gun, nose turret (483 rpg)
• 1 x 7.7 mm Te-1 army machine gun, ventral turret (483 rpg)

Usage in battles

If attacked by fighters, it is important to remember and recognize the Ki-21's turning capabilities. It is actually possible to win lateral turn fights against fighters with this aircraft as she is one of the most manoeuvrable bombers if not the most manoeuvrable bomber in game. While the Ki-21's defensive firepower isn't going to deter enemies from attacking, they still can damage enemy planes.

This aircraft has the ability to hold up to 1000 kg of bombs in several different variations: 20 x 50 kg, 10 x 100 kg, 4x 250 kg, and 2 x 500 kg. Use the 20 x 50 kg or 10 x 100 kg bombs to attack light tanks and light pillboxes. They are not viable against bigger targets, since direct hits are needed to destroy. This loadout is particularly useful on maps that have an abundance of non-moving targets (light pillboxes) or lightly armoured targets (armoured cars or AA trucks for example). Use either of the 4 x 250 kg or 2 x 500 kg payload to destroy heavier targets such as medium tanks, pillboxes, destroyers, and cargo ships.

Although unconventional, this aircraft is a fantastic weapon if you want to bait the enemy. Ideally, you would want to attract a higher flying enemy down to you and to get into a turn fight. This way, depending on the enemy aircraft you can out manoeuvre and distract him while teammates fly down to finish him off.

You should avoid any plane with cannons as this plane, while it is reasonably durable, does not like to take hits from cannon rounds. The plane that should be feared the most is the LaGG-3-34 which has the 37 mm cannon with the Air targets belts, as a single round from the 37 mm cannon will either cripple the Ki-21 or destroy it immediately.

Manual Engine Control

MEC elements
Mixer	Pitch	Radiator			Supercharger	Turbocharger
		Oil	Water	Type
Not controllable	Not controllable Not auto controlled	Controllable Auto control available	Controllable Auto control available	Separate	Not controllable 1 gear	Not controllable

Modules

Tier	Flight performance		Survivability	Weaponry
I	Fuselage repair	Radiator		Turret 7 mm	12 in (mod30)
II		Compressor	Airframe	New 7 mm MGs (turret)
III	Wings repair	Engine		Turret 7 mm	14 in (mod30)
IV		Engine injection	Cover	New 7 mm MGs (turret)

• Being a bomber, speed is not necessarily an important attribute, however payload and defensive armament is. Upgrading the bombs allows for more target flexibility and damage potential while turret upgrades will help survivability. the turret belts and the "new turrets" upgrades are useful. The "new turrets" upgrade will allow you to fire the turrets for longer periods of time and having access to multiple ammunition belts is also helpful. The engine upgrades are also useful in that they will help you reach your target faster and will control engine temperature. Having all of the weapons upgrades will help drastically in unlocking the other modules on this aircraft. Getting the airframe module does help in survivability as it helps your plane's durability.

Pros and cons

Pros:

• Very manoeuvrable
• Extensive bombload for a rank I Japanese bomber
• Decent cruising speed
• Durable, can take some hits
• Above average defensive armament for its BR
• Internal payload

Cons:

• Loses effectiveness with altitude
• No armour
• Defensive armament is still outclassed by many
• Falls quickly when attacked by multiple foes
• Head on attacks are usually fatal because of lack of protection for the pilots
• Gunners can be knocked out easily

History

In 1936, the Imperial Japanese Army Air Service issued a requirement for a new heavy bomber to replace two previous models. This new heavy bomber had to have a crew of four to six men, a top speed of 400 km/h (250 mph), had to be able to carry a bomb load greater than 750 kg (1,650 lb), had to be able to climb to altitude in less than 8 minutes, and had to take off in less than 300 m (980 ft). The new bomber also had to utilize Nakajima Ha-5 or Mitsubishi Ha-6 engines and had to contain specific models of radios, among many other specifications. These requirements were quite extensive and there weren't many heavy bombers in existence at the time that could perform at these standards.

Mitsubishi produced two prototypes of the Ki-21 to meet these standards. This new design proved superior to the design submitted by Kawasaki but was nearly on-par with Nakajima's submission. In early tests, Nakajima's prototype, the Ki-19 had more reliable engines and a better bombing platform, while the Ki-21 had better overall performance. In later rounds of testing, after the Army Air Service ordered modifications to be made to both prototypes, the Ki-21 came out on top and won the Army's contract for a heavy bomber.

Production began in November 1937 and the bomber began to see action in August 1938. The specific variant seen in game, the Ki-21-Ia, was used on the Chinese front during the Second Sino-Japanese War and against the Soviet Union during the Nomohan Incident. The Ki-21 would start off successfully during early World War 2, but by the end of World War 2 it was relegated to second line duties or kamikaze attacks. Overall 2,064 Mitsubishi Ki-21s of all variants were produced for the Japanese Army Air Force.

Media

Excellent additions to the article would be video guides, screenshots from the game, and photos.

See also

Links to the articles on the War Thunder Wiki that you think will be useful for the reader, for example:

• reference to the series of the aircraft;
• links to approximate analogues of other nations and research trees.

External links

Paste links to sources and external resources, such as:

• topic on the official game forum;
• encyclopedia page on the aircraft;
• other literature.

Mitsubishi Company (三菱商会)
Fighters	A5M4 · Hagiri's A5M4
	A6M2 mod. 11 · A6M2 · A6M3 · A6M3 mod. 22 · A6M3 mod. 22Ko · A6M5 · A6M5 Ko · A6M5 otsu · A6M5 Hei · A6M6c
	A7M1 (NK9H) · A7M2
	J2M2 · J2M3 · J2M4 Kai · J2M5 · J2M5 (30 mm)
Hydroplanes	F1M2
Interceptors	Ki-83 · Ki-109
Bombers	G4M1
	Ki-21-Ia · Ki-21-I hei · Ki-67-I Ko · Ki-67-I otsu
Jet Fighters	Ki-200
Captured	▃A6M2 · ␗A6M2
See also	Mitsubishi Heavy Industries, Ltd. (Post-War)

Japan bombers
Navy
Carrier-based attack bomber
B5N	B5N2
B6N	B6N1 · B6N2 · B6N2a
B7A	B7A2 · B7A2 (Homare 23)
Carrier-based dive bomber
D3A	D3A1
D4Y	D4Y1 · D4Y2 · D4Y3 Ko
Shipboard Observation seaplane
F1M	F1M2
Land-based Attack bomber
G4M	G4M1
G5N	G5N1
G8N	G8N1
Flying boat
H6K	H6K4
H8K	H8K2 · H8K3
Land-based Bomber
P1Y	P1Y1
Army
Light	Ki-32
	Ki-48-II otsu
Heavy	Ki-21-Ia · Ki-21-I hei
	Ki-49-I · Ki-49-IIa · Ki-49-IIb · Ki-49-IIb/L
	Ki-67-I Ko · Ki-67-I otsu
Other countries	▅B-17E