Global Defence Review profiles Mauser-Werke Oberdorf Waffensysteme’s new BK 27 aircraft cannon

Typhoon storm front

When the Eurofighter Typhoon enters frontline service, its pilot will fly into potential combat zones with a powerful weapons suite that includes a revolutionary ammunition loading system for the aircraft’s Mauser 27mm cannon.

The Eurofighter’s BK 27 weapon system is an evolution of the cannon used in the Tornado, Gripen and Alpha Jet combat aircraft. The cannon gives Eurofighter pilots a potent air-to-ground or air-to-air weapon system, when used with the appropriate ammunition.

Older designs of cannons use ammunition held together by link devices to form belts. The used link and empty cases are then either ejected from the aircraft or collected inside the fuselage in special containers. This free flying material is often a major cause of stoppages in aircraft cannons, rendering the aircraft defenceless or without an important offensive element of its weapon system.

To deal with the problem Mauser has been working on the BK 27 Linkless, that uses a conveyer belt principle to move live ammunition from the storage box into the gun and then return empty cases of expended rounds back into the storage box. At all times the rounds of ammunition are under control and not free flying. There are also no links to cause stoppages.

“With the linkless system there is less potential for stoppages than with free flying based ammunition feed systems,” said Bernhard Peter, senior programme leader at Mauser. The beauty of the system is that everything is contained. There is also a weight and volume saving because no link is used. Every kilogram of weight saved on an aircraft is extremely valuable.

The system has been fully developed, tested and qualified over more than a decade. This includes tests in a centrifuge to G-forces higher than expected to be encountered during Eurofighter flight profiles.

Mauser has started series production and the first aircraft armed with the weapon will roll off production lines in 2000. An issue still to be addressed by many Eurofighter users is the type of ammunition to be purchased. It is likely that former Tornado users will wish to use their existing stocks of ammunition before opting to re-order. Some existing Tornado users are also looking at the new system as a possible item to retro-fit to their aircraft as they undergo mid-life upgrade programmes.

Naval options

Apart from being used as an aircraft cannon, the BK 27 has been integrated in the Drakon close-in weapon system (CIWS), MN 27 GS and MLG 27 naval systems.

Mauser naval 27/30mm system

The lightweight naval mount, equipped with either the BK 27 high-rate-of-fire revolver cannon or the excellent high-fire-power MK 30 automatic cannon, is a modular naval weapon system for use as secondary armament on combat ships and a main weapon system on smaller units. Targets like aircraft, helicopters, speed boats, floating mines and coastal objects are intercepted with great accuracy and effective ammunition. System operation is by remote control. The turret is operated by the control handle on the non-exposed console.

Drakon: close-in weapon system

The Mauser Drakon close-in weapon system is based on the recently developed, tested and proven MIDAS quadruple gun system. To permit its use on different types of warship, Drakon is capable of being integrated, as a single quadruple gun mount, into almost any shipboard fire control system. Equipped with a platform-based or remote tracking system, it can be integrated into a number of ship-borne search radar. As a stand-alone system it needs to be provided with an FCS, including track and search sensors. The Drakon system has been designed to operate automatically and to counter the ever increasing threat of aircraft and highly manoeuvrable missiles.

MLG 27 light naval gun mount

This single barrel system is currently under development as part of a contract with the German navy. The weapon is intended to replace existing 20mm to 40mm gun systems on warships. Its main role is the destruction of inflatable boats, low flying helicopters and aircraft, as well as destroying surface mines and torpedoes. A flangible tungston penetrator round that produces devastating splinters is used by the weapon. This is a non-exploding green round. ©

Technical data

Calibre: 27mm x 145

Type: gas-operated automatic revolver cannon

Version: left-hand feed, right-hand feed, linkless feed with case recovery

Electric power supply: 2.75A within a voltage range of 22.5 to 30.5VDC

Mass of gun: 100kg/220lb (including barrel)

Mass of barrel: 17kg/37.5lb

Length: 2.310mm

Height: 246mm

Rate of fire: 1700+/-100 natural rpm, lower training rates possible

Time to rate: instantaneous

Recoil load: 28kN/6200lb, 9kN/2000lb

Run-out load: 16kN/0kN: 3500lb/0lb, depending upon configuration and installation

Mean rounds between failure: 1400rds for gun and ammo, 2300 gun (proven value)

Available ammunition: AP, APHE, HE, SAPHE, MP, TP-FP, TP, TP-T, APDSFS (only for naval applications)

Features: low volume, low system weight, high fire power in target (air/air, air/ground), low time of flight projectile, long stand-off range

Status: in continuous production

The Mauser MK 30 automatic cannon – part of a modular naval weapon system for secondary armament on combat ships or main armament on smaller units.

Advanced 27mm cannon in JSF contest

Citing lower costs, greater lethality and improved supportability, Boeing targeted the advanced 27mm aircraft cannon for its next-generation joint strike fighter (JSF) combat aircraft. Boeing will use the 27mm cannon as the basis for the gun system aboard the JSF.

Boeing, Arizona; Mauser-Werke Oberndorf, Germany; Primex Technologies, Florida; and Western Design, California, will jointly develop the 27mm cannon system, based on the combat-proven BK27 cannon, developed by Mauser. The gun also is a candidate for the Lockheed Martin version of the JSF. The JSF next-generation combat aircraft will replace fighter planes in the US Air Force, US Marine Corps, US Navy, UK Royal Navy and Royal Air Force. The US government will select one of the two teams to build the JSF next year.

The 27mm cannon is a single barrel, gas-operated lightweight revolver gun that fires electrically primed 27mm ammunition at 1,800 shots per minute.

“It’s the lightest, most accurate and reliable gun based on our initial studies,” said Dennis Muilenburg, JSF weapon system director for Boeing. “Our comparative assessment found the 27mm cannon to be more affordable, more lethal and more supportable than any of the competitors.”

The next step is for JSF and ordnance engineers at Boeing is to evaluate detailed gun integration into the Boeing JSF design.

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