ShKAS machine gun


The ShKAS is a 7.62 mm calibre machine gun widely used by Soviet aircraft in the 1930s and during World War II. The ShKAS had the highest rate of fire of any aircraft machine gun in general service during WWII, around 1800 RPM. It was designed by Boris Shpitalniy and Irinarkh Komaritsky and entered production in 1934. ShKAS was used in the majority of Soviet fighters and bombers and served as the basis for the ShVAK cannon.

Description

ShKAS is a gas-operated aircraft machine gun; it has a single chamber in which the pin strikes the primer.
A key element of the ShKAS' high rate of fire is the revolving drum that holds ten rounds and provides a very smooth, progressive removal of the cartridges from their disintegrating link belt.
The bolt locking action is Browning-style, i.e. slightly tilted wedge bolt.
The bolt action mechanism is the "gas piston in a tube - rod - bolt frame", rather similar to Kalashnikov's assault rifle.
The main difference with AK is that, with AK, the whole assembly of piston-rod-bolt frame is a single large and heavy part. And, with ShKAS, it is split to several parts - the piston, the rod and the bolt frame, with a "personal" recoil spring for each of them.
This provided for the lightweight recoiling portion of the gun, which weighs only 921 grams.
A declassified US analysis of the feed system, based on models captured during the Korean War, reads:
After analysing the less unusual parts of the ShKAS, the US source concludes:
Although ShKAS is best known for its high rate of fire, it did have provision for slower cyclic rates by lowering the gas-pressure. This was done by "changing the position of the holes in the gas regulator, which comes with holes of three different sizes: 2.1 mm, 2.5 mm and 3.2 mm. The smaller the orifice used, the more moderate is the rate of fire obtained."

Variants

Initial production consisted of cable-charged wing-mounted and turret-mounted ShKAS with a synchronized version entering service in 1936.
By 1952 Western intelligence had identified five different models, all including the number "426" in their markings:
  • a prototype "426" appeared in 1932
  • KM-33, in flexible role, appeared in 1933
  • KM-35, in flexible role and wing-mounted
  • KM-36, in flexible role and propeller-synchronized ; the latter had an extra-long barrel
  • a 1941 model, wing-mounted
"KM" stands for "constructed model", i.e. production. The intended role was marked with the letters "T" for flexible, "K" for wing, and "S" synchronized. The flexible version was usually mounted in a Soviet copy of the Scarff ring. The 1937 model had slightly higher maximum rate of fire of 2,000 rounds per minute. The amount of ammunition normally carried was 750 rounds for the fixed models and 1,000 to 1,500 for the flexible.
Soviet archives indicate the following production volumes, by year:
  • 1933 — 365 produced
  • 1934 — 2,476
  • 1935 — 3,566
  • 1937 — 13,005
  • 1938 — 19,687
  • 1940 — 34,233
  • 1943 — 29,450
  • 1944 — 36,255
  • 1945 — 12,455
In 1939, a small number of Ultra-ShKAS were produced featuring a firing rate of 3,000 rounds per minute but these saw only limited use due to reliability problems.

Effectiveness

The ShKAS was the fastest-firing rifle calibre aircraft armament in general service in World War II. A one-second burst from the four ShKAS of a Polikarpov I-153 or Polikarpov I-16 placed 120 bullets within 15 angular mils at 400 meters giving a firing density of 5 bullets per square meter of the sky. Moreover, the ShKAS was unusually light as well; the four guns, with 650 rounds of ammunition each, weighed a total of only 160 kg.
ShKAS wasn't problem-free though. Soviet machine-gun technician Viktor M. Sinaisky recalled:

Gun specifications

  • Cartridge: 7.62×54mmR
  • Calibre:
  • Rate of fire: 1,800 rounds/min wing- or turret-mounted; 1,625 rounds/min synchronized. UltraShKAS: 3,000 rounds/min.
  • Muzzle velocity:
  • Weight: empty; with 650 rounds of ammunition.

    7.62 mm ammunition specifications

Although chambered in the 7.62×54mmR, the ShKAS guns used cartridges specially built for them to smaller tolerances; to distinguish them from the regular 7.62 ammunition, the Cyrillic letter "Sh" was imprinted on the bottom of the cases. The cases, designed by N. M. Elizarov, also had a few additional features like double crimping and a thicker case wall of "bimetallic" construction instead of the traditional brass. The main type of bullet used was armour-piercing incendiary B-32 bullet. Ammunition marked as such should not be fired out of any regular 7.62×54mmR rifles.
  • Bullet weight: 148 grains
  • Round weight: 370 grains
  • Ballistic coefficient: 2,100 kg/m2
  • Tracer ammunition duration: 750 m
  • Armour piercing: 11 mm at 400 m

    Possible influences

Some military historians believe the feed system of the Mauser 213C was inspired by the ShKAS. However, the method of operation is very different: gas-operation on the ShKAS versus a revolving cam on the MG 213C.

Users

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