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Japanese 57mm Ho-401 Cannon


Photograph of 57mm Ho-401 cannon

National Archives. Via Mikesh (2004)

Specifications:

Ammunition
57 x 121 R with HE round
Projectile weight     
4.54 lb
1.5kg
Velocity 1624 feet per second
495 meters per second
Gun weight
330 lb
150 kg
Rate of fire     
80 rounds per minute


The Ho-401 cannon was installed in the Ki-102 "Randy" ground attack aircraft. It was primarily a strafing weapon, although it is credited witha single highly dubious claim of shooting down a B-29. It was essentially a scaled-up Ho-203 using a 57mm tank round. Like the Ho-203, its rate of fire depended on the choice of recoil buffer fluid, but 80 rounds per minute was typical. It used a long recoil falling-block breech action and was fed from a 17-round endless (closed loop) belt.

References

Francillon (1979)

Mikesh (2004)

Williams and Gustin (2003)


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