The design of this weapon was started in 1940 and was based upon the Army 72-K gun. Prototype testing in 1941 was unsuccessful and the gun was not accepted for production. It was then redesigned in 1943 and was accepted into production in 1944. In 1944-45 a total of 330 guns were built after which production was halted.
In 1944 a twin mount 3-1 was designed using two 84-KM guns. The trials were successful, but the mount was not accepted into production.
Guns used in single mountings are air-cooled and the mountings are similar to those used for 20 mm Oerlikon guns. These guns are clip-fed and single mountings have 11 ready clips.
Actual bore diameter is 25.4 mm (1.0").
Designation | 25 mm/76 (1") 84-KM |
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Ship Class Used On | Light ships 1944-45 |
Date Of Design | 1941-44 |
Date In Service | 1944 |
Gun Weight | 94.8 lbs. (43 kg) |
Gun Length oa | 82.52 in (2.096 m) (with flash suppresser) |
Barrel Length | 75.39 in (1.915 m) |
Rifling Length | 66.86 in (1.683 m) |
Grooves | 12 |
Lands | N/A |
Twist | N/A |
Chamber Volume | 7.323 in3 (0.121 dm3) |
Rate Of Fire | Cyclic: 200-260 rounds per minute |
Type | Fixed |
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Weight of Complete Round | FRAG incendiary tracer (OZR-132): 1.38 lbs. (0.627 kg) AP tracer (Br-132): 1.51 lbs. (0.684 kg) |
Projectile Types and Weights | FRAG incendiary tracer (OZR-132): 0.635 lbs. (0.288 kg) AP tracer (Br-132): 0.65 lbs. (0.295 kg) |
Bursting Charge | N/A |
Projectile Length | N/A |
Propellant Charge | 0.022 lbs (100 g) |
Muzzle Velocity | FRAG incendiary tracer (OZR-132): 2,980 fps (910 mps) AP tracer (Br-132): 2,950 fps (900 mps) |
Working Pressure | 18.4 tons/in2 2,900 kg/cm2 |
Approximate Barrel Life | 2,000 rounds |
Ammunition stowage per gun | N/A |
Elevation | Distance |
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Max. Range | 2,625 yards (2,400 m) |
Effective AA Ceiling | 6,560 feet (2,000 m) |
Data from:
- "Entsiklopedia Otechestvennoi Artillerii" (Encyclopedia of Fatherland (Russian) Artillery) by A.V. Shirokorad
Special help from Vladimir Yakubov