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"APACHE" | AH-64A Peten
This page is about the Japanese dive bomber D4Y1. For other uses, see D4Y (Family).
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The D4Y1 Suisei (Comet), nicknamed Judy by the Americans, is a rank II Japanese bomber with a battle rating of 2.0 (AB/RB) and 2.3 (SB). It was introduced in Update 1.75 "La Résistance". It is a very strong ground attack aircraft, and thanks to its high speed and agility, it can make a great fighter. This is your typical Japanese dive bomber, which has excellent ground pounding capabilities, as well as fighter hunting abilities. All these gifts come with downsides, as the D4Y1 is unable to carry rockets or torpedoes, unlike the D4Y2, and has poor defensive armament compared to the D4Y3. It has an Atsuta Atsuta 21 12-cylinder inline engine, which provides excellent power, but unfortunately has overheating issues.

General info

Flight performance

Arrestor gear
Accelerates braking by grabbing the brake cable on the deck of the aircraft carrier
Air brakes
Allows you to dramatically reduce the flight speed by releasing special flaps
Max speed
at 4 750 m552 km/h
Turn time23 s
Max altitude9 800 m
EngineAtsuta Atsuta 21
Cooling systemWater
Take-off weight4 t
The D4Y1 going into a dive to destroy a small boat

The D4Y1 is a highly agile and speedy aircraft, it can turn fight anything it wishes, even Spitfires. It gets a bomber airspawn, which allows the D4Y1 to outclimb all the fighters, but be sure to select the right airspawn, because it gets a carrier spawn by default on pacific maps. The only issue with the performance of this aircraft arises at high altitudes, where it is left without a supercharger.

Characteristics Max Speed
(km/h at 4,750 m)
Max altitude
Turn time
Rate of climb
Take-off run
Stock 520 509 9800 23.9 24.5 5.6 5.6 300
Upgraded 589 552 22.2 23.0 14.4 9.3


The D4Y1 is useful in Naval Ralistic Battles, as it can destroy many lightly armored boats at this BR with its 500kg bomb
Combat flaps Take-off flaps Landing flaps Air brakes Arrestor gear
Wings (km/h) Gear (km/h) Flaps (km/h) Max Static G
Combat Take-off Landing + -
750 350 457 428 280 ~15 ~11
Optimal velocities (km/h)
Ailerons Rudder Elevators Radiator
< 350 < 400 < 400 > 200
Compressor (RB/SB)
Setting 1
Optimal altitude 100% Engine power WEP Engine power
4,500 m 970 hp 1,218 hp

Survivability and armour

Crew2 people
Speed of destruction
Structural750 km/h
Gear350 km/h

The D4Y1 has no armour. Additionally, the fuel tanks are not self-sealing. There are 2 in each wing. The gunner is not covered, making him vulnerable to attacks from the rear.

Modifications and economy

Repair costBasic → Reference
AB770 → 970 Sl icon.png
RB1 600 → 2 017 Sl icon.png
SB2 250 → 2 837 Sl icon.png
Total cost of modifications8 420 Rp icon.png
16 300 Sl icon.png
Talisman cost640 Ge icon.png
Crew training6 300 Sl icon.png
Experts22 000 Sl icon.png
Aces180 Ge icon.png
Research Aces190 000 Rp icon.png
Reward for battleAB / RB / SB
50 / 130 / 230 % Sl icon.png
118 / 118 / 118 % Rp icon.png
Flight performance Survivability Weaponry
Mods aerodinamic fuse.png
Fuselage repair
560 Rp icon.png
1 100 Sl icon.png
90 Ge icon.png
Mods radiator.png
560 Rp icon.png
1 100 Sl icon.png
90 Ge icon.png
Mods compressor.png
630 Rp icon.png
1 200 Sl icon.png
100 Ge icon.png
Mods aerodinamic wing.png
Wings repair
530 Rp icon.png
1 000 Sl icon.png
90 Ge icon.png
Mods new engine.png
530 Rp icon.png
1 000 Sl icon.png
90 Ge icon.png
Mods metanol.png
Engine injection
910 Rp icon.png
1 800 Sl icon.png
150 Ge icon.png
Mods armor frame.png
630 Rp icon.png
1 200 Sl icon.png
100 Ge icon.png
Mods armor cover.png
910 Rp icon.png
1 800 Sl icon.png
150 Ge icon.png
Mods ammo.png
560 Rp icon.png
1 100 Sl icon.png
90 Ge icon.png
Mod arrow 0.png
Mods weapon.png
630 Rp icon.png
1 200 Sl icon.png
100 Ge icon.png
Mods ammo.png
530 Rp icon.png
1 000 Sl icon.png
90 Ge icon.png
Mod arrow 0.png
Mods pilon bomb.png
13 in (mod35)
530 Rp icon.png
1 000 Sl icon.png
90 Ge icon.png
Mods turret gun.png
910 Rp icon.png
1 800 Sl icon.png
150 Ge icon.png

The payload option should be a top priority, so getting to tier three modifications is of utmost importance. Rush the new belts and MGs, or the radiator or compressor if you choose to have better performance. Then get the bomb modification. After that, research all engine modifications and then the survivability modifications. Save the turret upgrades for last.


Offensive armament

Ammunition1 200 rounds
Fire rate900 shots/min
D4Y1 pulling out of a dive
Main article: Type 97 navy (7.7 mm)

The D4Y1 is armed with:

  • 2 x 7.7 mm Type 97 navy machine guns, nose-mounted (600 rpg = 1,200 total)

Suspended armament

Number of setups2
List of setups
Setup 11 x 250 kg Navy Type Number 25 Model 2 bomb
(ammunition: 0 rounds)
Setup 21 x 500 kg Number Type 2 50 Model 1 GP(SAP) bomb
(ammunition: 0 rounds)

The D4Y1 can be outfitted with the following ordnance:

  • Without load
  • 1 x 250 kg Navy Type Number 25 Model 2 bomb (250 kg total)
  • 1 x 500 kg Number Type 2 50 Model 1 GP(SAP) bomb (500 kg total)

Defensive armament

Turret7.7 mm Type 92 machine gun
Ammunition582 rounds
Fire rate600 shots/min
Main article: Type 92 (7.7 mm)

The D4Y1 is defended by:

  • 1 x 7.7 mm Type 92 machine gun, dorsal turret (582 rpg)

Usage in battles

The D4Y1 in Fiji

The D4Y1 is an excellent example of a multirole aircraft, as it is an excellent ground attack aircraft, fighter, and bomber. Since you get a bomber airspawn, you can drop your bomb on a base and then start to engage the many fighters below you. You should have no problems engaging them, as long is you keep your speed up and your energy high. One key thing to note is that you don't need to use your defensive turret to shoo away enemy interceptors. You can easily out turn any interceptor at that BR. Besides the fighter role, ground attack is the D4Y1's natural method of play. The 500kg bomb will be excellent for destroying Pillboxes, and you can use your Rifle Caliber machine guns to destroy any soft target you please.Spec

Specific enemies worth noting

  • CW-21 - The CW-21 poses a significant threat to the D4Y1, as it can out-turn, out-climb, and outclass the D4Y1 in every conceivable way. Its armament will shred through the D4Y1, and your plane would be a sitting duck. Now, your gunner can be of some use. Since the CW-21 is a very fragile aircraft, your gunner can set it afire, thus giving you the upper hand. But never under any circumstance attempt to go near this plane, as your gunner is only a last resort.
  • He 100 D-1 - Much like the CW-21, this aircraft will outclass you in every way. Your turret will once again come in handy, as it will surely damage its cooling system.

Manual Engine Control

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

Pros and cons

The D4Y1's defensive gunner, which can help pick seagulls off of your six


  • D4Y for Carrier-based dive bomber:
    • Choice between a 250kg & 500kg bomb
    • Bomber airspawn, outclimbs anything and can intercept
    • Airbrakes
  • Common Navy plane construction:
    • Nose mounted armament
    • Small radiator drag
    • Excellent manoeuvrability, can outrun early Corsairs, Wildcats, and Spitfires
  • D4Y Specific:
    • Fast, can outrun almost anything, save the CW-21 and He 100
      • Its speed forces the enemy to tail behind your gunner, giving you a chance to shoot at the approaching fighter with your turret
  • D4Y1 Specific:
    • Has 400 more rounds in the offensive machine guns than the D4Y2 and D4Y3 Ko, making ammo count less of an issue
The D4Y1 has great turret coverage, it covers a high angle of attack from boom and zoomers.


  • D4Y for Carrier-based dive bomber:
    • Has bomb cradle, significant delay in fuselage bomb drop
    • Not good for bombing bases
  • Common Navy plane construction:
  • D4Y (early) Specific:
    • Engine overheats easily, it isn't a traditional Japanese radial engine
  • D4Y1 Specific:
    • Rockets can only be launched two at a time, giving you only two chances to down a bomber


D4Y1 in flight

Nicknamed the the "Judy" by allied pilots, the D4Y1 at the beginning of the war was one the fastest planes in all of the Pacific.

The D4Y1 was a carrier based dive bomber, powered by a 1,200 hp "Aichi AE1A Atsuta V12" engine. The D4Y1 was modeled after the German He 118 with the engine being modeled after the DB 601 which was used in the Bf 110. Due to the Japanese Navy requiring an extreme range for the aircraft, it was designed without any armour or self-sealing fuel tanks to lighten the plane so it would use less fuel. The lack of armour and protection decreased the weight, making them extremely quick and nimble but fragile if taking enemy fire. Combined with the unreliable engine, the D4Y1 would see many upgrades in the following models adjusting many of the flaws.

In 1943 with the introduction of the F6F Hellcat, the D4Y's became a sitting duck. Whereas with the F4F Wildcat, the D4Y's could just outrun them, the F6F would catch them with ease. During the "Great Marianas Turkey Shoot" a single F6F pilot Alexander Vraciu would shoot down 6 D4Y's within minutes. 400 Japanese planes would be shot down that day, but a D4Y did land a direct hit on the battleship USS South Dakota.

The D4Y's would become one of the most iconic planes the Japanese Military would use during World War 2.

Only a single complete D4Y1 survives today, located at the "Yasukuni Jinja Yūshūkan shrine" in Tokyo it can be seen completely restored.


See also

  • D4Y family
  • D4Y2 - An improved D4Y1 with a better engine and rocket payload
  • D4Y3 Ko - An improved D4Y2 with an even better engine and a better turret

External links

Yokosuka Naval Air Technical Arsenal (海軍航空技術廠)
Bombers  D4Y1 · D4Y2 · D4Y3 Ko
  P1Y1 mod. 11
Jet fighters  R2Y2 Kai V1 · R2Y2 Kai V2 · R2Y2 Kai V3
Captured  ␗P1Y1 mod. 11
  While the arsenal was simply known as the Naval Air Technical Arsenal and usually referred to as Kūgi-shō (Kaigun Kōkū Gijutsu-shō).
  The name Yokosuka prevailed however, even though it referred to the Arsenal's location.

Japan bombers
Carrier-based dive bomber 
D3A  D3A1
D4Y  D4Y1 · D4Y2 · D4Y3 Ko
Carrier-based attack bomber 
B5N  B5N2
B6N  B6N1 Model 11 · B6N2 Model 12 · B6N2a Model 12Ko
B7A  B7A2
Land-based Bomber 
P1Y  P1Y1 mod. 11
Land-based Attack bomber 
G4M  G4M1
G5N  G5N1
G8N  G8N1
Flying boat 
H6K  H6K4
H8K  H8K2 · H8K3
Shipboard Observation seaplane 
F1M  F1M2
Light  Ki-32
Medium  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