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Japanese 4.7"/45 10th Year Type (1921) Dual-Purpose Gun


Photograph of 4.7" naval gun emplaced for coastal
        defense
National Archives #80-G-247827. Via NavWeaps.com

Specifications:

Bore diameter
4.724"
120mm
Ammunition type
Fixed base or nose fused HE shells.
Incendiary, shrapnel, illuminating, and antisubmarine rounds were also available.

Weight of round

45 lbs
20.41 kg

Velocity

2720 feet per second
830 meters per second

Maximum elevation   

75 degrees

Range

17,500 yards
16,000 meters

Altitude

32,800 feet
10,000 meters

Firing cycle

6 seconds


This weapon was used on Akagi and the Furutakas as well as some escort vessels. Relatively few were produced, and the gun suffered from an inappropriate choice of powder grain, leading to unburned grains at the muzzle, which reduced accuracy. The propellant problem was resolved late in the war.

A number were used for coastal defense, as shown in the photograph above.

Photo Gallery

Aoba-class cruiser secondary armament

Wikimedia

Kamikaze class main armament

Wikimedia

References

Campbell (1985)


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