The BK 27 (also BK27 or BK-27) (German acronym for Bordkanone, "on-board cannon") is a 27 mm (1.063 in) caliber revolver cannon manufactured by Mauser (now part of Rheinmetall) of Germany. It was developed in the late 1960s for the MRCA (Multi Role Combat Aircraft) program that ultimately became the Panavia Tornado.[2]

Mauser BK-27
Mauser BK-27 LKCV.jpg
The Mauser BK-27
TypeRevolver cannon
Place of originGermany
Service history
Used bySee users
Production history
DesignerMauser (now Rheinmetall)
Designed1976
ManufacturerMauser (now Rheinmetall)
Produced1977–present
No. built3,100~
Specifications
Mass100 kg (220 lboz)
Length2.31 m (7 ft 7 in)
Barrel length1.73 m (5 ft 8 in)

Shell27×145 mm
Caliber27 mm (1.063 in) caliber
BarrelsSingle barrel
Actionrevolver
Rate of fire1,000–1,700 rpm (+/− 100 rpm), selectable
Muzzle velocity1,100 m/s (3,600 ft/s)[1]

The BK 27 is a gas-operated cannon firing a new series of 27×145 mm cartridges with a typical projectile weight of 260 g (9.2 oz), and a total weight for the complete round of 516 g (1.14 lb).[1] Most models use a linked feed system for the ammunition; however, the Eurofighter Typhoon makes use of a specially developed variant of the BK 27 that uses a linkless feed system instead, which is intended to improve reliability.[2]

DesignEdit

The Mauser BK 27 is used in the Panavia Tornado, the Alpha Jet, the JAS 39 Gripen, and the Eurofighter Typhoon. At one time the USAF was considering to license its production for the F-35 Lightning II, but instead elected for the GAU-22/A.[citation needed]

Rheinmetall has also developed remote controlled naval versions, the MN 27 GS and the MLG 27 fully automatic naval guns, which are installed on many ships of the German Navy. Ninety-nine MLG 27s have been ordered by the German Navy so far.[3] The cannon is a single-barrel, high performance, breech-cylinder gun operated by a fully automatic electrically fired gas-operated system at a selective rate of 1000 or 1700 rounds per minute.[2] The Mauser BK 27 utilizes pyrotechnic cocking charges to cycle the action.

The BK27 has a much lower nominal fire rate than the M61 Vulcan, but its fire rate is constant throughout shooting due to the fact the cannon need not spin up. As a result, in conjunction with the higher caliber, the Mauser BK 27 fires in the first half second 4 kg of projectiles in contrast to the 2 kg of the M61 Vulcan which also needs about 25 kW electrical power on the maximum fire rate.[citation needed]

As for ammunition types the gun mainly fires mine shells as these have the best effect against aircraft but the gun also has access to several types of armor piercing shells like the frangible armour piercing shell named Fap 27 mm x 145 mm ammunition/peb327 (DM103).

UsersEdit

 
MLG 27 mounted on board an Elbe-class replenishment ship of the German Navy
 
MLG 27 on board a Berlin-class replenishment ship of the German Navy
  Algeria
  Austria
  Bolivia
  Brunei
  Brazil
  Cameroon
  Canada
  Czech Republic
  Germany
  Hungary
  Italy
  Portugal
  South Africa
  Saudi Arabia
  Sweden
  Spain
  Thailand
  United Kingdom
  United Arab Emirates

SpecificationsEdit

 
Helicopter-mounted Mauser BK-27

Data from Jane's Information Group[2]

  • Type: single-barrel revolver cannon
  • Caliber: 27 mm × 145 (1.063 in)
  • Operation: revolver
  • Length: 2.31 m (7 ft 7 in)
  • Weight (complete): 100 kg (220 lb)
  • Rate of fire: 1,700 rpm (+/− 100 rpm)
  • Muzzle velocity: 1,100 m/s (3,600 ft/s)
  • Muzzle energy: ~157,300 Joules
  • Projectile weight: 260 g (9.2 oz)

See alsoEdit

ReferencesEdit

Notes
  1. ^ a b "Germany 27 mm/145 MLG 27 - NavWeaps". navweaps.com. Retrieved 5 February 2019.
  2. ^ a b c d Ian, V. Hogg; Terry, J. Gander (1998). "Cannon - 20 to 30 mm cannon: 27 x 145 B ammunition (Switzerland)". Jane's Ammunition Handbook. Jane's Information Group. ISBN 9780710617897.
  3. ^ "Archived copy". Archived from the original on 2007-12-04. Retrieved 2010-05-26.CS1 maint: archived copy as title (link)
  4. ^ "Algerian National Navy, Algeria Naval forces, القوات البحرية الجزائرية‎, naval defence industry, navy technology, frigates, corvettes, submarines, systems". Navyrecognition.com. 2012-07-25. Retrieved 2019-02-05.
  5. ^ "Saab Presents First Gripen E to Brazil". Saab. 10 September 2019.

External linksEdit