GIAT M811

Last updated
GIAT M811
Type Autocannon
Place of origin France
Service history
Used bySee operators
Production history
Designer GIAT Industries
Manufacturer Nexter Systems
Specifications
Mass113 kg (249 lb)
Length2,640 mm (104 in)
Barrel  length2,160 mm (85 in)
Width345 mm (13.6 in)
Height370 mm (15 in)

Shell NATO 25×137mm
Caliber 25 mm
Action Externally powered, electric drive
Rate of fire Low: 125 rds/min
High: 400 rds/min
Muzzle velocity 1,360 m/s (4,500 ft/s)
Effective firing range1,500 m (4,900 ft) APFSDS
Feed systemDual Feed

The M811 is an automatic, externally powered, single- or dual-fed autocannon firing NATO standard 25mm ammunition, designed by Nexter Systems (previously GIAT Industries). [1]

Contents

History

The M811 was first shown in June 1983. Its intended use is in an air defense or direct-fire role, mounted on either naval or land platforms, replacing existing 20 mm cannon where applicable. The Model 811 has been installed on the Nexter Vextra 8 × 8 technology demonstrator for trial purposes. The turret installation was also provisionally selected for installation on the French Army's Vehicule Blindé de Combat d'Infanterie (VBCI) 8 × 8 Infantry Fighting Vehicle (IFV).

Description

Operation of the Model 811 is by an external electric motor that drives a camshaft lying inside the receiver. This shaft has a spiral cam groove that engages with a lug on the bolt, so that as the shaft revolves, the bolt is moved back and forth. The shaft is also geared to the feed mechanism, so that feed is in strict synchronization with the bolt's movements. A hang-fire safety device is provided. Fire modes are single shot, limited bursts or continuous bursts with a pre-selectable cyclic rate of fire at 125 or 400 rounds/min. The feed direction for the percussion-primed 25 × 137 ammunition can be manually or remotely selected, through an electrical feeder selection device. The first round fired following selection comes from the belt that has just been selected. The external power feature can be used for maintenance and training using dummy rounds. The Model 811 can fire all NATO standard 25×137 ammunition. Current ammunition available from Nexter Munitions include the following; High Explosive Incendiary Tracer (HEI-T), Target Practice (TP), Target Practice Tracer (TP-T), Armour-Piercing Discarding-Sabot Tracer (APDS-T) and Armour-Piercing Fin-Stabilised Discarding-Sabot Tracer (APFSDS-T). According to Nexter Systems, the accuracy of the Model 811 25 mm is such that all rounds fired will hit a 1.5 m diameter target at a range of 1,500 m.

Related Research Articles

<span class="mw-page-title-main">Kinetic energy penetrator</span> High density non-explosive projectile

A kinetic energy penetrator (KEP), also known as long-rod penetrator (LRP), is a type of ammunition designed to penetrate vehicle armour using a flechette-like, high-sectional density projectile. Like a bullet or kinetic energy weapon, this type of ammunition does not contain explosive payloads and uses purely kinetic energy to penetrate the target. Modern KEP munitions are typically of the armour-piercing fin-stabilized discarding sabot (APFSDS) type.

<span class="mw-page-title-main">Armour-piercing ammunition</span> Ammunition type designed to penetrate armour

Armour-piercing ammunition (AP) is a type of projectile designed to penetrate armour protection, most often including naval armour, body armour, vehicle armour.

<span class="mw-page-title-main">.50 BMG</span> Rifle cartridge designed by John Moses Browning

The .50 BMG, also known as 12.7×99mm NATO, and designated as the 50 Browning by the C.I.P., is a .50 in (12.7 mm) caliber cartridge developed for the M2 Browning heavy machine gun in the late 1910s, entering official service in 1921. Under STANAG 4383, it is a standard service cartridge for NATO forces, as well as many non-NATO countries. The cartridge itself has been made in many variants: multiple generations of regular ball, tracer, armor-piercing (AP), incendiary, and saboted sub-caliber rounds. The rounds intended for machine guns are made into a continuous ammunition belt using metallic links.

<span class="mw-page-title-main">25 mm caliber</span> Specific size of autocannon ammunition

25 mm caliber is a range of autocannon ammunition. It includes the NATO standardized Swiss 25×137mm, the Swiss 25×184mm, the Soviet 25x218mmSR, and the Chinese 25×183mmB.

<span class="mw-page-title-main">Armour-piercing discarding sabot</span> Anti-tank projectile

Armour-piercing discarding sabot (APDS) is a type of spin-stabilized kinetic energy projectile for anti-armour warfare. Each projectile consists of a sub-calibre round fitted with a sabot. The combination of a lighter sub-calibre projectile with a full-calibre propellant charge allows for an increase in muzzle velocity compared to full-calibre rounds, giving the round increased armour-penetration performance. To further enhance their armour-penetration capabilities, APDS rounds typically feature a hardened core made from tungsten or another hard, dense material.

<span class="mw-page-title-main">M242 Bushmaster</span> American autocannon

The M242 Bushmaster chain gun is a 25 mm (25×137mm) single-barrel chain-driven autocannon. It is used extensively by the U.S. military, such as in the Bradley fighting vehicle, as well as by other NATO members and some other nations in ground combat vehicles and various watercraft. Hughes Helicopters in Culver City, California, was the original designer and manufacturer. As of 2019, Northrop Grumman Innovation Systems produces the gun.

20 mm caliber is a specific size of popular autocannon ammunition. The dividing line between smaller-caliber weapons, commonly called "guns", from larger-caliber "cannons", is conventionally taken to be the 20 mm round, the smallest caliber of autocannon. All 20 mm cartridges have an outside projectile (bullet) diameter and barrel bore diameter of approximately 0.787 inches (20.0 mm). These projectiles are typically 75 to 127 mm (3–5 in) long, cartridge cases are typically 75 to 152 mm (3–6 in) long, and most are shells, with an explosive payload and detonating fuze.

<span class="mw-page-title-main">Rheinmetall Rh-120</span> Smoothbore tank gun

The Rheinmetall Rh-120 is a 120 mm smoothbore tank gun designed and produced in former West Germany by the Rheinmetall Waffe Munition GmbH company, it was developed in response to Soviet advances in armour technology and development of new armoured threats. Production began in 1974, with the first version of the gun, known as the L/44 as it was 44 calibres long, used on the German Leopard 2 tank and soon produced under license for the American M1A1 Abrams and other tanks. The 120-millimetre (4.7 in) gun has a length of 5.28 metres (17.3 ft), and the gun system weighs approximately 3,317 kilograms (7,313 lb).

<span class="mw-page-title-main">Mk44 Bushmaster II</span> 30 mm chain gun

The Mk44 Bushmaster II is a 30 mm chain gun manufactured by Northrop Grumman. It is a derivative of the 25 mm M242 Bushmaster, and uses 70% of the same parts as the M242 while increasing the firepower by as much as 50% with the 20% increase in caliber size. The barrel is chromium-plated for extended life. The gun uses standard GAU-8 Avenger ammunition that is available in API, HEI and APFSDS-T variants.

<span class="mw-page-title-main">M829</span> American armor-piercing tank round

The M829 is an American armor-piercing fin-stabilized discarding sabot (APFSDS) kinetic energy penetrator tank round. Modeling was done at the Ballistic Research Laboratory at Aberdeen Proving Ground, which was incorporated into the Army Research Laboratory in 1992. The round is specifically designed for the 120 mm M256 main gun on the Abrams M1A1 and M1A2 main battle tanks. The penetrator is carried by a sabot during its acceleration in the gun barrel.

<span class="mw-page-title-main">D-10 tank gun</span> Rifled tank/antitank gun

The D-10 is a Soviet 100 mm tank gun developed in late World War II. It originally equipped the SU-100 tank destroyers and was later selected for the T-55 tank, equipping these as late as 1979. On the T-55 the D-10 continues to be in active service in many countries.

<span class="mw-page-title-main">Armour-piercing fin-stabilized discarding sabot</span> Ammunition type for Tanks

Armour-piercing fin-stabilized discarding sabot (APFSDS), long dart penetrator, or simply dart ammunition is a type of kinetic energy penetrator ammunition used to attack modern vehicle armour. As an armament for main battle tanks, it succeeds Armour-Piercing Discarding Sabot (APDS) ammunition, which is still used in small or medium caliber weapon systems.

List of abbreviations, acronyms and initials related to military subjects such as modern armour, artillery, infantry, and weapons, along with their definitions.

<span class="mw-page-title-main">Ordnance QF 32-pounder</span> Gun

The Ordnance QF 32 pounder or (32-pdr) was a British 94 mm gun, initially developed as a replacement for the Ordnance QF 17-pdr anti-tank gun.

<span class="mw-page-title-main">Ammunition</span> Material fired, scattered, dropped, or detonated from a weapon or weapon system

Ammunition is the material fired, scattered, dropped, or detonated from any weapon or weapon system. Ammunition is both expendable weapons and the component parts of other weapons that create the effect on a target.

<span class="mw-page-title-main">Royal Ordnance L11</span> Weapon

The Royal Ordnance L11A5, officially designated Gun, 120 mm, Tank L11, is a 120 mm L/55 rifled tank gun design. It was the second 120 mm calibre tank gun in service with British Army. It was the first of NATO's 120 mm main battle tank guns which became the standard calibre for Western tanks in the later period of the Cold War. A total of 3,012 of the L11 guns were produced by 2005. The list price was US$227,000 in 1990.

<span class="mw-page-title-main">Gryazev-Shipunov GSh-30-1</span> 1980s Soviet 30mm aircraft autocannon

The Gryazev-Shipunov GSh-30-1 is a 30 mm autocannon designed for use on Soviet and later Russian military aircraft, entering service in the early 1980s. Its current manufacturer is the Russian company JSC Izhmash. The name GSH-30-1 is formed from the surnames of the designers Gryazev (Грязев) and Shipunov (Шипунов), the caliber of 30 mm and the single-barrel design of the gun itself.

<span class="mw-page-title-main">Oerlikon KBA</span> Swiss autocannon

The Oerlikon KBA is a 25 mm (25×137mm) autocannon, developed as a close range multipurpose weapon for the mechanised battlefield, originally made by Oerlikon and currently produced in Rheinmetall Italia S.p.A. facilities. It is a positively locked breech, gas and recoil operated cannon with a rotating bolt head and a dual-belt selective feed system taking a 25mm NATO cartridge. The rate of fire in burst mode is 600 rounds per minute but it can be adjusted electronically and reduced to single shot or a selectable range from 100 up to 200 rounds per minute.

<span class="mw-page-title-main">XM913 chain gun</span> Experimental American chain gun

The XM913 is an experimental American chain gun produced at Picatinny Arsenal. The cannon is a larger and more modern version of the 35 mm Bushmaster III chain gun, which itself is a larger version of the 25 mm M242 Bushmaster cannon. Although its shells, 50 x 228 mm, are twice the diameter of the 25×137mm cartridge of the M242, the 50mm cannon is not much longer than the smaller weapon. The overall lengths of the 25mm cannon and 50mm cannon are 105.2 inches (267 cm) and 117.7 inches (299 cm), respectively; while the portion of the gun that intrudes into the turret are 30.0 inches (76 cm) and 40.1 inches (102 cm), respectively.

<span class="mw-page-title-main">Mark 38 25 mm machine gun system</span> Short-range shipboard weapon system

The Mark 38 25 mm machine gun system (MGS) is a shipboard weapon system designed to protect warships primarily from a variety of surface threats, especially small, fast surface craft. It consists of an M242 Bushmaster chain gun mounted on a turret that can be either manually or remote controlled, depending on variant. Originally designed by the United States in the 1980s for use on their warships, the Mark 38 is today in service on warships of various NATO countries.

References

  1. "Overview". www.militaryperiscope.com. Retrieved 2023-10-11.