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{{more footnotes|date=June 2013}}
{{inline}}
{{infobox weapon {{infobox weapon
| name = B-20 | name = B-20
| image = | image = Tula_State_Museum_of_Weapons_(79-30).jpg
| caption = | image_size = 300
| origin = {{USSR}} | caption = Second from the top in the middle
| origin = ]
| type = ] | type = ]
<!-- Type selection --> <!-- Type selection -->
Line 10: Line 11:
| is_artillery = | is_artillery =
<!-- Service history --> <!-- Service history -->
| service = ], ] et.al (Soviet Air Forces) | service = ], ]
| used_by = | used_by =
| wars = ], ] | wars = ], ]
<!-- Production history --> <!-- Production history -->
| designer = ] | designer = ]
| design_date = 1944 | design_date = 1944
| manufacturer = | manufacturer =
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<!-- General specifications --> <!-- General specifications -->
| spec_label = | spec_label =
| weight = | weight = 25 kg (55 lb)
| length = | length = {{convert|2035|mm|in|1|abbr=on}}
| part_length = | part_length = {{convert|1588|mm|in|1|abbr=on}}
| width = | width =
| height = | height =
| diameter = | diameter =
<!-- Ranged weapon specifications --> <!-- Ranged weapon specifications -->
| cartridge = 20 x 99 mm (0.8 x 3.9 in) | cartridge = 20×99mmR
| cartridge_weight = | cartridge_weight =
| caliber = 20mm (0.8in) | caliber = 20 mm (0.8 in)
| barrels = one | barrels = 1
| action = Gas | action = Gas
| rate = 800 Rounds/min | rate = 800 rounds/min (600 ])
| velocity = 750-770 m/s (2,460-2,525 ft/s) | velocity = {{convert|790|-|815|m/s|abbr=on}}
| range = | range =
| max_range = | max_range =
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}} }}


The '''Berezin B-20''' (Березин Б-20) was a ] ] used by ] aircraft in ]. The '''Berezin B-20''' (Березин Б-20) was a ] ] used by ] ] in ].


==Development== ==Development==
The B-20 was created by ] in ] by chambering his ] 12.7 mm machine gun for the 20 mm rounds used by the ] cannon. No other changes were made to the weapon which was pneumatically or mechanically charged and was available in both synchronized and unsynchronized versions. In ], an electrically-fired version was created for the turrets of the ] bomber until the ] cannon became available. The B-20 was a welcome replacement for the ] because is was significantly lighter (25 kg (55 lb) vs ShVAK's 40 kg (80 lb)) without sacrificing rate of fire or muzzle velocity. The B-20 was created by ] in ] by converting his 12.7&nbsp;mm ] machine gun to use the 20&nbsp;mm rounds used by the ]. No other changes were made to the weapon which was pneumatically or mechanically charged and was available in both synchronized and unsynchronized versions. In ], an electrically-fired version was created for the turrets of the ] bomber until the ] cannon became available. The B-20 was a welcome replacement for the ShVAK because it was significantly lighter - 25&nbsp;kg (55&nbsp;lb) to the 40&nbsp;kg (80&nbsp;lb) ShVAK - without sacrificing rate of fire or muzzle velocity.


==Specifications== ==Specifications==
* '''Ammunition:''' 20 x 99 mm (0.8 x 3.9 in) * '''Ammunition:''' ]
* '''Empty weight:''' 25 kg (55 lb) * '''Empty weight:''' 25&nbsp;kg (55&nbsp;lbs)
* ''']:''' 750-770 m/s (2,460-2,525 ft/s) * ''']:''' 750–770&nbsp;m/s (2,460-2,525&nbsp;ft/s)
* '''Rate of fire:''' 800 rounds/min * '''Rate of fire:''' 800 rounds/min (600 synchronized)
* '''Mass of one-second burst:''' 0.95 kg (2.1 lb) * '''One-second burst-mass:''' Unsynchronized, 1.27&nbsp;kg (2.8&nbsp;lbs); Synchronized, 0.95&nbsp;kg (2.1&nbsp;lbs)


==Production== ==Production==
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* 1949 — 2,931 * 1949 — 2,931


==Related content== ==See also==
⚫ * ]
'''Related developments:''' '''Related developments:'''
* ] machine gun * ] machine gun
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* ] * ]
* ] * ]
* ]
* ] cannon * ] cannon


==See also== == Notes ==
{{reflist}}
⚫ * ]


==References== ==References==
* Широкоград А.Б. (2001) ''История авиационного вооружения'' Харвест (Shirokograd A.B. (2001) ''Istorya aviatsionnogo vooruzhenia'' Harvest. ISBN 985-433-695-6) (''History of aircraft armament'') * Широкоград А.Б. (2001) ''История авиационного вооружения'' Харвест (Shirokograd A.B. (2001) ''Istorya aviatsionnogo vooruzhenia'' Harvest. {{ISBN|985-433-695-6}}) (''History of aircraft armament'')
*{{cite book *{{cite book
| last = Koll | last = Koll
| first = Christian | first = Christian
| authorlink = | author-link =
| coauthors =
| title = Soviet Cannon - A Comprehensive Study of Soviet Arms and Ammunition in Calibres 12.7mm to 57mm | title = Soviet Cannon - A Comprehensive Study of Soviet Arms and Ammunition in Calibres 12.7mm to 57mm
| publisher = Koll | publisher = Koll
Line 90: Line 92:
| url = http://www.russianammo.org | url = http://www.russianammo.org
| doi = | doi =
| id = ISBN 978-3-200-01445-9 | isbn = 978-3-200-01445-9
| page = 121 }} | page = 121 }}


{{Russian and Soviet Aircraft Ordnance}}
{{Aviation lists}}


] ]
] ]
]
] ]
]
]

Latest revision as of 00:43, 6 June 2024

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Autocannon
B-20
Second from the top in the middle
TypeAutocannon
Place of originUSSR
Service history
In serviceSoviet Air Forces, Soviet Air Defence Forces
WarsWorld War II, Korean War
Production history
DesignerMikhail Yevgenyevich Berezin
Designed1944
Specifications
Mass25 kg (55 lb)
Length2,035 mm (80.1 in)
Barrel length1,588 mm (62.5 in)
Cartridge20×99mmR
Caliber20 mm (0.8 in)
Barrels1
ActionGas
Rate of fire800 rounds/min (600 synchronized)
Muzzle velocity790–815 m/s (2,590–2,670 ft/s)

The Berezin B-20 (Березин Б-20) was a 20 mm caliber autocannon used by Soviet aircraft in World War II.

Development

The B-20 was created by Mikhail Yevgenyevich Berezin in 1944 by converting his 12.7 mm Berezin UB machine gun to use the 20 mm rounds used by the ShVAK cannon. No other changes were made to the weapon which was pneumatically or mechanically charged and was available in both synchronized and unsynchronized versions. In 1946, an electrically-fired version was created for the turrets of the Tupolev Tu-4 bomber until the Nudelman-Rikhter NR-23 cannon became available. The B-20 was a welcome replacement for the ShVAK because it was significantly lighter - 25 kg (55 lb) to the 40 kg (80 lb) ShVAK - without sacrificing rate of fire or muzzle velocity.

Specifications

  • Ammunition: 20×99mm
  • Empty weight: 25 kg (55 lbs)
  • Muzzle velocity: 750–770 m/s (2,460-2,525 ft/s)
  • Rate of fire: 800 rounds/min (600 synchronized)
  • One-second burst-mass: Unsynchronized, 1.27 kg (2.8 lbs); Synchronized, 0.95 kg (2.1 lbs)

Production

The Soviet archives register the following production numbers by year:

  • 1944 — 2,275
  • 1945 — 7,240
  • 1946 — 440
  • 1947 — 780
  • 1948 — 1,686
  • 1949 — 2,931

See also

Related developments:

Similar weapons:

Notes

  1. Shirokograd, p 119

References

Russian and former Soviet aircraft ordnance
Missiles
Air-to-air
Air-to-surface
Anti-ship, cruise
Anti-tank
Rockets
Aerial bombs
Autocannons,
machine guns
7.62 mm
12.7 mm
20 mm
23 mm
30 mm
37 mm
45 mm
57 mm
Categories: