ZPU-4

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ZPU-4 in Batey ha-Osef museum, Israel.

The ZPU-4 is a towed quadruple barreled anti-aircraft gun. Based on the Soviet KPV 14.5 mm machine gun. It entered service with the Soviet Union in 1949 and is used by over 50 countries worldwide. Double and single barreled version of the weapon exist - called the ZPU-2 and ZPU-1 respectively.

1 Description
2 History
3 Ammunition
4 Variants
5 Specifications
6 Operators
7 References

[edit] Description

Development of the ZPU-2 and ZPU-4 began in 1945, with development of the ZPU-1 starting in 1947. All three were accepted into service in 1949. Improved optical predicting gunsights were developed for the system in the 1950s.

All weapons in the ZPU series have air cooled quick change barrels and can fire a variety of ammuniiton including API (BS.41), API-T (BZT), I-T (ZP) projectiles. Each barrel has a maximum rate of fire of around 600 rounds per minute, though this is practically limited to about 150 rounds per minute.

The quad ZPU-4 uses a four-wheel carriage similar to that once used by the obsolete 25 mm automatic antiaircraft gun M1940. In firing position the weapon is towered onto firing jacks. It can be bought in and out of action in about 15 to 20 seconds, and can be fired with the wheels in the travelling position if needed.

The double ZPU-2 was built in two different version, an early model with large mud guards and two wheels that are removed in the firing position. The late model has wheels that fold and are raised from the ground in the firing position.

The single ZPU-1 is carried on a two wheeled carriage. Weapon can be broken down into several 80 kg units for transport over rough ground.

Versions of the weapon are built in both China and North Korea.

[edit] History

It was used in during the Korean War by Chinese and North Korean forces. and was later considered the most dangerous opposition to U.S. helicopters in Vietnam. It was used by Iraqi forces during Operation Desert Storm.

In many units it has been replaced by the newer and more powerful twin 23 mm automatic antiaircraft gun ZU-23.

[edit] Ammunition

ZPU-4

API (BS.41) - Full metal jacket bullet round with a tungsten-carbide core. Projectile weight is 64.4 g and Muzzle velocity is 976 m/s. Armour penetration at 500 m is 32 mm of RHA at 0 degrees.
API-T (BZT) - Full metal jacket round with a steel core. Projectile weight is 59.56 g and muzzle velocity is 1,005 m/s. Tracer burns to at least 2,000 m.
I-T (ZP) - Projectile weight is 59.68 g.

Rounds are also produced by Bulgaria, China, Egypt, Poland, and Romania.

[edit] Variants

ZPU-2

ZPU-4
- Type 56 - Chinese built version.
ZPU-2
- Type 58 - Chinese built version.
ZPU-1
BTR-40A SPAAG - A BTR-40 APC with a ZPU-2 gun mounted in the rear. Entered service in 1950.
BTR-152A SPAAG - A BTR-152 with a ZPU-2 mounted in the rear. Entered service in 1952.

[edit] Specifications

ZPU-1

Model	ZPU-1	ZPU-2 (early)	ZPU-2 (late)	ZPU-4
Barrels	1	2	2	4
Weight (travelling)	413 kg	994 kg	649 kg	1,810 kg
Weight (firing)	413 kg	639 kg	621 kg	1,810 kg
Length (travel)	3.44 m	3.54 m	3.87 m	4.53 m
Width (travel)	1.62 m	1.92 m	1.37 m	1.72 m
Height (travel)	1.34 m	1.83 m	1.1 m	2.13 m
Elevation	+88/-8	+90/-7	+85/-15	+90/-10
Traverse	360
Maximum range	8,000 m
Maximum altitude	5,000 m
Effective altitude	1,400 m
Ammunition (rounds)	1200	2400		4800
Crew	4	5