ShVAK cannon

The ShVAK (Russian: ШВАК: Шпитальный-Владимиров Авиационный Крупнокалиберный, Shpitalnyi-Vladimirov Aviatsionnyi Krupnokalibernyi, "Shpitalny-Vladimirov Aviation Large-calibre") was a 20 mm autocannon used by the Soviet Union during World War II. It was designed by Boris Shpitalniy and Semyon Vladimirov and entered production in 1936. ShVAK were installed in many models of Soviet aircraft. The TNSh was a version of the gun produced for light tanks (Russian: ТНШ: Tankovyi Nudel’man-Shpitalnyi). ShVAK shares the name with its 12.7 mm heavy machine gun predecessor.

ShVAK
TypeAutocannon
Place of originUSSR
Service history
In serviceFrom 1936
Used bySoviet armed forces
WarsFrom World War II
Production history
DesignerBoris Shpitalniy and Semyon Vladimirov
Designed1935–1936
Produced1936–1946
VariantsThree 20 mm variants for aircraft mounts
plus, one tank variant (TNSh)
also, 12.7 mm predecessor
Specifications
Mass55 kg (121.3 lb) (MP)
44.5 kg (98.1 lb) (SP)
40 kg (88.2 lb) (TP)
38 kg (83.8 lb) (KP)
Length2,325 mm (91.5 in) (MP)
2,074 mm (81.7 in) (SP)
1,729 mm (68.1 in) (TP)
1,679 mm (66.1 in) (KP)
Barrel length1,650 mm (65.0 in) (SP,MP)
1,255 mm (49.4 in) (KP,TP)

Cartridge20×99mmR
12.7x108mmR
Cartridge weight(OZ) 96.0
Caliber20 mm (0.787 in)
12.7 mm (0.500 in)
Barrels1
ActionGas-operated
Rate of fire700–850 rounds/min (550-750 synchronized SP)
Muzzle velocity750–790 metres per second (2,500–2,600 ft/s)
Feed systemBelt-fed
Filling weight(OZ) 2.8 g HE + 3.3 g incendiary
Detonation
mechanism
(OZ) Nose fuze
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