Russian 23 mm/71 (0.91") VYa

Russian
23 mm/71.7 (0.91") VYa
Updated 27 August 2006

This VYa aircraft cannon was used in three naval mounts that were designed in 1944. The mountings were the single U-23, twin 2-U-23 and quad 4-U-23. The guns were belt-fed with 50 or 65 round belts. The single mount was manually operated, while twin and quad mounts were electrically powered. The gun had a monobloc barrel with a blade type breech. All three mountings passed trials in 1944 and 2-U-23 and 4-U-23 were accepted into limited production and were used on MTBs.

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Gun Characteristics .

Designation	23 mm/71.7 (0.91") VYa
Ship Class Used On	MTBs
Date Of Design	1944
Date In Service	1944
Gun Weight	145.5 lbs. (66 kg)
Gun Length oa	N/A
Barrel Length	64.96 in (1,650 m)
Rifling Length	58.74 in (1.492 m)
Grooves	N/A
Lands	N/A
Twist	N/A
Chamber Volume	N/A
Rate Of Fire	550-650 rounds per minute per barrel cyclic

Ammunition .

Type	Fixed
Weight of Complete Round	N/A
Projectile Types and Weights	0.441 lbs. (0.2 kg)
Bursting Charge	N/A
Projectile Length	N/A
Propellant Charge	0.14 lbs. (64 g)
Muzzle Velocity	2,985 - 3,020 fps (910 - 920 mps)
Working Pressure	19.7 tons/in² (3,100 kg/cm²)
Approximate Barrel Life	N/A
Ammunition stowage per gun	N/A

Range .

Elevation	With 0.73 lbs. (0.331 kg) shells
Max. Effective Range	3,280 yards (3,000 m)
Max. AA Ceiling	9,840 feet (3,000 m)

Mount / Turret Data .

Designation	Single Mount: U-23 Twin Mount: 2-U-23 Quad Mount: 4-U-23
Weight	U-23: 1,190.5 lbs. (540 kg) 2-U-23: 2,513 lbs. (1,140 kg) 4-U-23: 4,343.1 lbs. (1,970 kg)
Elevation	U-23: -10 / +85 degrees 2-U-23: -12 / +85 degrees 4-U-23: -10 / +85 degrees
Elevation Rate	2-U-23: 90 degrees per second 4-U-23: 28 degrees per second
Train	360 degrees
Train Rate	2-U-23: 45 degrees per second 4-U-23: 50 degrees per second
Gun recoil	N/A

Data from
"Entsiklopedia Otechestvennoi Artillerii" (Encyclopedia of Fatherland (Russian) Artillery) by A.V. Shirokorad
Special help from Vladimir Yakubov