D4Y3 Ko

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This page is about the Japanese dive bomber D4Y3 Ko. For other versions, see D4Y (Family).
d4y3.png
GarageImage D4Y3 Ko.jpg
ArtImage D4Y3 Ko.png
D4Y3 Ko
Research:11 000 Specs-Card-Exp.png
Purchase:22 000 Specs-Card-Lion.png
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Description

The D4Y3 mod. 33 Ko, designated as the Suisei 33A (彗星三三型甲), was a stop-gap measure for the piling up Suisei 12s without engines due to the production shortage of the materially expensive licensed DB601 engine. Instead of going for the high-output Atsuta 32 inline engine, the Suisei 33 was equipped with the Kinsei 62 radial engine which had relatively high output and abundant supply. Simply switching out the engine for a radial of roughly the same output still resulted in a decline of performance due to the aerodynamic characteristics, so the previous Model 12 was kept in parallel production and delivered to high-priority units instead.

It was introduced in Update 1.71 "New E.R.A.". While the main difference of the D4Y3 compared to the D4Y1 and D4Y2 is the engine, this doesn't result in better performance, on the contrary, due to the remodeled nose and aerial cooled engine, aerodynamics are worse and result in higher drag which put it just behind the D4Y2 in performance, while still performing better than the D4Y1. The main benefit of this Suisei however comes with the "Ko" subvariant, which was present on all standard production D4Ys, which swapped out their rear armament from the factory standard 7.7 mm Type 92 MG to the 13 mm Type 2 HMG which will shred any foe on its tail.

Nicknames

General info

Flight performance

The D4Y3 in flight
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 6 050 m574 km/h
Turn time22 s
Max altitude9 800 m
EngineMitsubishi Kinsei 62
TypeRadial
Cooling systemAir
Take-off weight5 t

While the D4Y3 switches out the inline Atsuta engine found on the first two D4Y aircraft, for a radial Kinsei 62 engine, it performs far better than the base model D4Y1 but about on par with the improved inline Atsuta 32 of the D4Y2. The radial engine won't overheat in combat conditions and also has a less pronounced radiator, resulting in less drag.

Characteristics Max Speed
(km/h at 6,050 m)
Max altitude
(metres)
Turn time
(seconds)
Rate of climb
(metres/second)
Take-off run
(metres)
AB RB AB RB AB RB
Stock 547 527 9800 22.8 23.5 5.7 5.7 350
Upgraded 610 574 21.6 22.0 16.5 10.4

Details

D4Y3 in a dive
Features
Combat flaps Take-off flaps Landing flaps Air brakes Arrestor gear
Limits
Wings (km/h) Gear (km/h) Flaps (km/h) Max Static G
Combat Take-off Landing + -
750 350 457 428 280 ~16 ~11
Optimal velocities (km/h)
Ailerons Rudder Elevators Radiator
< 350 < 400 < 430 > 335
D4Y3 cockpit

Survivability and armour

Crew2 people
Speed of destruction
Structural0 km/h
Gear350 km/h

The D4Y (Family) lacks self-sealing fuel tanks and armour for speed and agility. As such, the D4Y3 should be treated like any other Japanese aircraft, with the utmost caution.

Modifications and economy

Repair costBasic → Reference
AB871 → 1 102 Sl icon.png
RB1 418 → 1 795 Sl icon.png
SB2 297 → 2 908 Sl icon.png
Total cost of modifications10 320 Rp icon.png
13 700 Sl icon.png
Talisman cost750 Ge icon.png
Crew training6 300 Sl icon.png
Experts22 000 Sl icon.png
Aces250 Ge icon.png
Research Aces220 000 Rp icon.png
Reward for battleAB / RB / SB
60 / 120 / 200 % Sl icon.png
124 / 124 / 124 % Rp icon.png
Modifications
Flight performance Survivability Weaponry
Mods aerodinamic fuse.png
Fuselage repair
Research:
520 Rp icon.png
Cost:
690 Sl icon.png
85 Ge icon.png
Mods radiator.png
Radiator
Research:
520 Rp icon.png
Cost:
690 Sl icon.png
85 Ge icon.png
Mods armor frame.png
Airframe
Research:
780 Rp icon.png
Cost:
1 000 Sl icon.png
125 Ge icon.png
Mods compressor.png
Compressor
Research:
780 Rp icon.png
Cost:
1 000 Sl icon.png
125 Ge icon.png
Mods aerodinamic wing.png
Wings repair
Research:
650 Rp icon.png
Cost:
860 Sl icon.png
105 Ge icon.png
Mods new engine.png
Engine
Research:
650 Rp icon.png
Cost:
860 Sl icon.png
105 Ge icon.png
Mods armor cover.png
Cover
Research:
1 100 Rp icon.png
Cost:
1 500 Sl icon.png
180 Ge icon.png
Mods metanol.png
Engine injection
Research:
1 100 Rp icon.png
Cost:
1 500 Sl icon.png
180 Ge icon.png
Mods ammo.png
type89_belt_pack
Research:
520 Rp icon.png
Cost:
690 Sl icon.png
85 Ge icon.png
Mod arrow 0.png
Mods pilon bomb.png
9 in (mod35)
Research:
520 Rp icon.png
Cost:
690 Sl icon.png
85 Ge icon.png
Mod arrow 1.png
Mods weapon.png
type97_new_gun
Research:
780 Rp icon.png
Cost:
1 000 Sl icon.png
125 Ge icon.png
Mods ammo.png
type2_turret_belt_pack
Research:
650 Rp icon.png
Cost:
860 Sl icon.png
105 Ge icon.png
Mod arrow 0.png
Mods pilon bomb.png
13 in (mod35)
Research:
650 Rp icon.png
Cost:
860 Sl icon.png
105 Ge icon.png
Mods turret gun.png
type2_turret_new_gun
Research:
1 100 Rp icon.png
Cost:
1 500 Sl icon.png
180 Ge icon.png

The bomb load-outs should be a priority for this aircraft, and the frontal machine guns should also be a module of importance. The compressor, Engine, and Injection will prove useful. After researching the engine mods, rush the Suitability modules. Only then should you tackle the turrets. The Wings Repair and Fuselage repair should come last.

Armaments

Offensive armament

Main article: Type 97 navy (7.7 mm)

The D4Y3 Ko is armed with:

  • 2 x 7.7 mm Type 97 navy machine guns, nose-mounted (400 rpg = 800 total)
D4Y3 in a steep dive

Suspended armament

The D4Y3 Ko can be outfitted with the following ordnance:

  • Without load
  • 1 x 250 kg Navy Type Number 25 Model 2 bomb + 2 x 60 kg Navy Type 97 Number 6 bombs (370 kg total)
  • 3 x 250 kg Navy Type Number 25 Model 2 bombs (750 kg total)
  • 1 x 500 kg Number Type 2 50 Model 1 GP(SAP) bomb (500 kg total)
  • 1 x 500 kg Number Type 2 50 Model 1 GP(SAP) bomb + 2 x 60 kg Navy Type 97 Number 6 bombs (620 kg total)

Defensive armament

Main article: Type 2 (13 mm)

The D4Y3 Ko is defended by:

  • 1 x 13 mm Type 2 machine gun, dorsal turret (250 rpg)
The D4Y3 about to destroy a medium tank

Usage in battles

The D4Y3 is an excellent example of a multirole aircraft, as it is an excellent ground attack aircraft, fighter, and bomber. Since you get a bomber air spawn, 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 as 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 battle rating. Besides the fighter role, the ground attack is the D4Y3's natural method of play. The 500 kg bomb will be excellent for destroying Pillboxes, and you can use your rifle-calibre machine guns to destroy any soft target you please.

Manual Engine Control

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

The radiator can be kept at 0% in climbs, the D4Y3 will manage to keep cool. Open the oil radiator and radiator to 10% when levelling off, to avoid overheat after prolonged periods of time. Propeller pitch should be kept at 90-100%, and stage two of the supercharger should only be activated at 3,000 m (10,000 ft).

The D4Y3 as seen from the front. The radial engine produces less drag, thus making it the fastest variant

Pros and cons

The D4Y3's HMG turret, which is very strong at picking off fighters. However, your primary method of defence is your manoeuvrability, not your turret

Pros:

  • D4Y for Carrier-based dive bomber:
    • Great bomb load-outs, can equip three 250 kg bombs, for a total weight of 750 kg
    • 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 P-38s
      • Its speed forces the enemy to tail behind your gunner, giving you a chance to shoot at the approaching fighter with your turret
  • D4Y3 Ko Specific:
    • Improved defensive armament
    • Improved radial engine which won't overheat, and is an improvement from the D4Y1 and D4Y2

Cons:

  • D4Y for Carrier-based dive bomber:
    • Has bomb cradle, significant delay in fuselage bomb drop
    • Not good for bombing bases
  • Common Navy plane construction:
    • Poor offensive armament: 7.7 mm Type 97 MG
    • Fragile, little armour, and no self-sealing fuel tanks
    • Exposed tail gunner
  • D4Y3 Ko Specific:
    • Has decreased ammo counted compared with the D4Y1
    • Limited ammo count for both 7.7 mm and 13.2 mm armaments

History

Main article: D4Y History

Nicknamed the "Judy" by allied pilots, the D4Y3 was feared by both troops on the ground and ships in the sea.

D4Y3 in Frozen Pass

The D4Y3 was converted to be a land based Dive Bomber, while its predecessor the D4Y2 was a carrier based dive bomber. The removal of the tail hook and the addition of the Mitsubishi Kinsei 62 radial engine added 150 horse power while reducing weight. The D4Y3 would see 3 variants, D4Y3 model 33, D4Y3 model 33A, and D4Y3 model 33 night-fighter.

Differences between the Model 33 and the Model 33a was the A variant had the 7.92 mm Type 1 rear-firing machine gun replaced with an upgraded 13 mm Type 2 rear-firing machine gun. With the night-fighter variant being equipped with an upwards firing 20 mm cannon. Only 3 night fighters were built as the D4Y2 night fighters were being used with success with fighters already available and assembly lines already making them.

With a range of 1,400 miles the D4Y3 was perfect for the defense of the Japanese territories. Combined with its extreme accuracy in a dive it saw great success especially in the battles at the end of the war. Notably, crippling the USS Kalinin Bay and the USS Suwannee both escort carriers. Eventually they would convert the D4Y3 into a D4Y4, which was exactly the same as the D4Y3 except it carried an un-removable 800 kg bomb for kamikaze attacks. Some D4Y4s were equipped with rockets to increase the speed at which the aircraft would strike their targets increasing the damage they caused.

No D4Y3's survived the war, but a D4Y1 was reconstructed with a Pratt and Whitney R-1830 radial engine to represent a D4Y3. This plane can be seen at the Planes of Fame Air Museum in Chino, California.

Media

Skins
Videos

See also

Related development
  • D4Y1 - Base model with a weaker inline engine (Atsuta 21)
  • D4Y2 - earlier model with a stronger inline engine (Atsuta 31) and rocket payload

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.
See also  Yokosuka Naval Arsenal (Shipyard)

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