Yokosuka D4Y2-S night fighter

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Airman 1st Class
May 2, 2005
I'm looking for a picture of Yokosuka D4Y2-S night fighter.
It had a 20 mm gun firing upward in the gunner position.

Found this on http://airwar.ru/enc/fww2/d4ys.html

I'm not sure at all, but wasn't it supposed to have an upward firing 20 mm gun? The russian web site says 2 20mm and 2 7.7 mm.

Is the Russian website the only source for that info? It's always a good idea to get at least another source for that kind of info. The web link I sent has a pretty good amount of Japanese aircraft pics and I have not been able to find something that they did not have a photo of. That being said, it could be one of those that very few know about or even a test aircraft design, etc. But a secondary source for the info on the upward firing guns might me a good idea.
No, on the contrary, from what I understand from that page, it seems that no weapon was upward firing. I don't remember where I read about the gun. I was looking for a photo to confirm the mounting.

I have three references on the D4y. All three mention limited use as a nightfighter, one goes into a little more detail mentioning 2 x 20 mounted behind the pilot firing at an oblique angle but I am afraid no picture. It does say however that only a small number were used and that they were all inline (Aichi Atsuta 32) powered versions.

Don't know how much that helps
Thanks Glider,
It's helpful, I wasn't yet sure if it was used as night fighter operationally.

Thanks Glider,
It's helpful, I wasn't yet sure if it was used as night fighter operationally.


Records of the 210 ku based at Meiji indicated that they had 5 D4Y2-S "Suisei Nightfighter" on strength. These aircraft were involved in interception of B-29 raids in 1944. However, it would appear that the missions were flown during the day (e.g. ~3PM Feb 10, 1944).


Some additional photos of models:

Maxs75 the night fighter version was also used by the 302Ku as shown on the box art.

Will a photo showing the actual victory markings suffice?

I have additional photo's that show the Judy carried a single upward firing 20mm cannon. Will post a couple of shots on the weekend if I can get my scanner woking again.


  • D4Y Judy ED-228 Tail with victories.jpg
    D4Y Judy ED-228 Tail with victories.jpg
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Maxs75, don't know if you're still looking but here are some shots of the cannon armed Judy.

The first is Yo-154, the 'Yo' represents the Yokosuka Naval air group which is rendered as a backwards E.

The second aircraft is from the 302 NAG code unknown.


  • Yo-154.JPG
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  • D4Y2-S Judy YoD.JPG
    D4Y2-S Judy YoD.JPG
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