Rheinmetall 120 mm gun

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Rheinmetall 120 mm tank gun
M256.png
A diagram of M256 gun
Type Smoothbore tank gun
Place of origin Germany
Service history
In service 1979–present
Used by see the operators section
Production history
Manufacturer Rheinmetall
Specifications
Weight 1,190 kg (2,620 lb) Gun barrel
3,317 kg (7,313 lb) Gun mount
Length L/44: 5.28 m (17.3 ft)
L/55: 6.6 m (22 ft)
Barrel length 44–55 calibers
Caliber 120 mm
Muzzle velocity 1,580 to 1,750 m/s (5,200 to 5,700 ft/s)
Effective firing range 4,000 meters (4,400 yd) with DM63[1]
8,000 meters (8,700 yd) with LAHAT[2]
Muzzle of a Rheinmetall 120 mm L/55 tank gun on a Spanish Leopard 2E

The Rheinmetall 120 mm gun is a smoothbore tank gun designed and produced by the West German Rheinmetall-DeTec AG company, developed in response to Soviet advances in armor technology and development of new armored threats. Production began in 1974, with the first version of the gun, known as the L/44 as it was 44 calibers long, used on the German Leopard 2 tank and soon produced under license for the American M1A1 Abrams and other tanks. The American version, the M256, uses a coil spring recoil system instead of a hydraulic system.[3] The Lua error in Module:Convert at line 272: attempt to index local 'cat' (a nil value). gun has a length of Lua error in Module:Convert at line 272: attempt to index local 'cat' (a nil value)., and the gun system weighs approximately 3,317 kilograms (7,313 lb).

By 1990 the L/44 was not considered powerful enough to deal with the future Soviet armour, which stimulated an effort by Rheinmetall to develop a better main armament. This first revolved around a Lua error in Module:Convert at line 272: attempt to index local 'cat' (a nil value). tank gun named Neue Panzerkanone 140 ("new tank gun 140"), but later turned into a compromise which led to the development of an advanced 120 mm gun, the L/55, based on the same internal geometry as the L/44 and installed in the same breech and mount. The L/55 is Lua error in Module:Convert at line 272: attempt to index local 'cat' (a nil value). longer, giving an increased muzzle velocity to ammunition fired through it. As the L/55 retains the same barrel geometry, it can fire the same ammunition as the L/44.

This gun was retrofitted into German and Dutch Leopard 2s, and chosen as the main gun of the Spanish Leopard 2E, and the Greek Leopard 2HEL. It was tested on the British Challenger 2 as a potential replacement for its current weapon, the rifled L30 120 mm cannon.

A variety of ammunition has been developed for use by tanks with guns based on Rheinmetall's original L/44 design. This includes a series of kinetic energy penetrators, such as the American M829 series, and chemical energy anti-tank warheads. Recent ammunition includes a wide range of new anti-personnel rounds and demolition munitions, giving tanks armed with the L/44 and its derivatives greater versatility on the modern battlefield. The LAHAT, developed in Israel, is a gun-launched missile which has received interest from Germany and other Leopard 2 users, and is designed to defeat both land armour and combat helicopters. The Israelis also introduced a new anti-personnel munition which limits collateral damage by controlling the fragmentation of the projectile.

Background

Prototype of the Leopard 2

Due to concerns about the inability of the Lua error in Module:Convert at line 272: attempt to index local 'cat' (a nil value). L7 tank gun then in use across NATO forces to penetrate new Soviet armor, as proved in German tests on four T-62 Soviet tanks captured by Israel following the June 1967 Six Day War, Rheinmetall was paid for the development of a new tank gun, a project started in 1965, as the Bundeswehr felt a more powerful gun was needed for its new tanks.[4][5] The first instance of a larger Soviet tank gun was witnessed on the chassis of a modified T-55 in 1961.[6] In 1965, the Soviet Union's T-62 made its first public appearance, armed with a 115-millimeter (4.5 in) smoothbore tank gun.[7] The Soviet decision to increase the power of its tank's main armament had come when, in the early 1960s, an Iranian tank commander defected over the Soviet border in a brand-new M60 Patton tank, which was armed with the British Royal Ordnance L7.[8] Despite the introduction of the T-62, in 1969 their T-64 tank was rearmed with a new 125-millimeter (4.9 in) tank gun,[8] while in 1972 Nizhny Tagil began production of the T-72 tank, also armed with the 125-millimeter (4.9 in) gun.[9] For example, at the fighting at Sultan Yakoub, during the 1982 Lebanon War, the Israeli government claimed to have destroyed nine Syrian T-72s with the Merkava main battle tank, armed with an Israeli production version of the American M68 105-millimeter (4.1 in) tank gun (which in turn was based on the British L7).[10] Whether or not true, the Soviets test-fired a number of Israeli M111 Hetz armor-piercing discarding sabot rounds at Kubinka, finding the 105-millimeter (4.1 in) round was able to perforate the T-72's sloped front section plate but not its turret armor.[11] In response, the Soviets developed the T-72M1.[12] This led Israel to opt for a 120 mm tank gun during the development process of the Merkava III main battle tank.[13] This case is similar to the American decision to replace the M68 105-millimeter (4.1 in) tank gun with Rheinmetall's 120 mm gun in 1976; the introduction of the T-64A had raised the question within the armor community whether the new ammunition for the existing gun caliber could effectively deal with the new Soviet tank.[14]

In 1963 Germany and the United States had already embarked on a joint tank program, known as the MBT-70. The new tank carried a three-man crew, with the driver in the turret, an automatic loader for the main gun, a 20-millimeter (0.79 in) autocannon as secondary armament, an active hydropneumatic suspension and spaced armour on the glacis plate and the front turret.[15] The new tank concept also had improved armament, a 152-millimeter (6.0 in) missile-launching main gun, designed to fire the MGM-51 Shillelagh anti-tank missile.[16] However, the German Army was interested in a tank gun which could fire conventional ammunition. Although there were attempts to modify the 152-millimeter (6.0 in) tank gun to do so, the process proved extremely difficult, and the Germans began development of the future Rheinmetall 120 mm gun instead.[17]

An M1A1 Abrams, firing its US built M256 120 mm tank gun

In 1967 the German Ministry of Defense decided to re-open a Leopard 1 improvement program, known as the Vergoldeter Leopard ("Gilded Leopard"), later renamed the Keiler ("Wild Boar"). Krauss-Maffei was chosen as the contractor, and two prototypes were developed in 1969 and 1970.[18] This program grew into the Leopard 2; the first prototype of the new tank was delivered in 1972, equipped with a 105-millimeter (4.1 in) smoothbore main gun. Between 1972 and 1975 a total of 17 prototypes were developed.[19] The new 120 mm gun's ten-year development effort, which had begun in 1964, ended in 1974.[5] Ten of the 17 turrets built were equipped with the 105 mm smoothbore gun, and the other seven were equipped with the larger 120 mm gun.[20] Another program aimed to mount the 152-millimeter (6.0 in) missile-gun was also developed in an attempt to save components from the MBT-70, but in 1971 the program was ended for economic reasons.[21] Instead, the Germans opted for Rheinmetall's 120 mm L/44 smoothbore tank gun.[22]

Design features

Austrian Leopard 2A4, smoothbore barrel.

Rheinmetall's L/44 tank gun has a caliber of 120 mm, and a length of 44 calibers (5.28 meters (17.3 ft)).[23] The gun's barrel weighs Lua error in Module:Convert at line 272: attempt to index local 'cat' (a nil value).,[24] and on the M1 Abrams the gun mount weighs 3,317 kilograms (7,313 lb),[25] while the new barrel (L/55) is 55 calibers long, 1.30 meters (4.3 ft) longer. The bore evacuator and the gun's thermal sleeve, designed to regulate the temperature of the barrel, are made of glass-reinforced plastic, while the barrel has a chrome lining to increase barrel life.[5] Originally the gun had an EFC barrel life of ~1,500 rounds,[26] but with recent advances in propellant technology the average life has increased even further.[27] The gun's recoil mechanism is composed of two hydraulic retarders and a hydropneumatic assembly.[5]

Rheinmetall L/44 120mm

Production of the German Leopard 2 and the new 120 mm tank gun began in 1979, fulfilling an order for the German Army.[28] Although the American M1 Abrams was originally armed with the M68A1 105 mm gun (a version of the L7),[29] the United States Army had planned to fit the tank with a larger main gun at a later date,[30] and the tank's turret had been designed to accommodate a larger 120 mm gun.[29] The larger gun was integrated into the M1A1 Abrams, with the first vehicle coming off the production line in 1985[31] The gun, known as the M256, was based on the L/44 tank gun, although manufactured at Watervliet Arsenal and modified to increase the resistance of the barrels to fracture and fatigue.[32] Tanks armed with versions of Rheinmetall's gun produced under licence include Japan's Type 90[33] and South Korea's K1A1.[34] The gun had made a huge turn in technological history.[29]

Rheinmetall L/55 120mm

Two Leopard 2A6s of the German Army with L55s

The appearance of new Soviet tanks such as the T-80B during the late 1970s and early 1980s demanded the development of new technologies and weapons to counter the threat posed to Western armor.[35] The T-80B had increased firepower[36] and a new composite ceramic armor.[37] The T-72 also went through a modernization program in an attempt to bring it up to the standards of the T-80B. In 1985 the new T-72B version entered production, with a new laminate armor protection system; its turret armor,designed primarily to defeat anti-tank missiles, surpassed the T-80B's in protection.[38]

The German government began the development of the Leopard 3, although this was canceled after the fall of the Soviet Union.[39] On 29 October 1991, the governments of Switzerland, Netherlands and Germany agreed to cooperate in the development of a modernization program for the Leopard 2. Part of this program included the introduction of a longer 120 mm tank gun,[40] a cheaper alternative to a brand new tank gun,[41] increasing the maximum range of the gun by an estimated 1,500 m (1,600 yd). Although the gun is longer, allowing for a higher peak pressure from the propellant, the geometry remains the same, allowing the gun to fire the same ammunition as that fired from the shorter version.[42] The longer barrel allows ammunition to attain higher velocities; for example, with new kinetic energy penetrators ammunition can reach velocities of around 1,800 m/s (5,900 ft/s).[43] The new barrel weighs 1,347 kg (2,970 lb).[24]

The longer tank gun has been retrofitted into the Leopard 2, creating a model known as the Leopard 2A6.[41] Both the Spanish Leopard 2E and the Greek Leopard 2HEL, as derivatives of the Leopard 2A6, use the 55 caliber-long tank gun.[44]

In summary, the L55 is a longer variant of the L44, but uses the same ammunition.

Ammunition

American M829A2 APFSDS DU round

A variety of rounds have been developed for Rheinmetall's tank gun. For example, a long line of armor-piercing discarding sabot (APDS) rounds was developed by Rheinmetall. Originally, the Leopard 2 was outfitted with the DM23 kinetic energy penetrator,[45] based on the Israeli M111 Hetz.[46] The DM23 was eventually replaced by the DM33, which was also adopted by Japan, Italy, Netherlands and Switzerland. The DM33 has a three-part aluminum sabot and a two-part tungsten penetrator, and is said to be able to penetrate Lua error in Module:Convert at line 272: attempt to index local 'cat' (a nil value). of steel armor at a range of 2,000 meters (2,200 yd).[47] The DM43 is a further development of this round, co-developed between Germany and France. The introduction of the longer barrel came hand in hand with the introduction of a new kinetic energy penetrator, the DM53. With the projectile including sabot weighing in at 8.35 kilograms with a 38:1 length to diameter ratio and with a muzzle velocity of 1,750 meters per second (5,700 ft/s), the DM53 has an effective engagement range of up to 4,000 meters (4,400 yd).[1] A further development, called the DM63, improved upon the round by introducing a new temperature-independent propellant, which allows the propellant to have a constant pattern of expansion between ambient temperatures inside the gun barrel from Lua error in Module:Convert at line 272: attempt to index local 'cat' (a nil value). to Lua error in Module:Convert at line 272: attempt to index local 'cat' (a nil value).. The new propellant powders, known as surface-coated double-base (SCDB) propellants, allow the DM63 to be used in many climates with consistent results.[48] The new ammunition has been accepted into service with the Dutch and Swiss, as well as German, armies.[49]

The United States developed its own kinetic energy penetrator (KEP) tank round in the form of an Armor-Piercing Fin-Stabilized Discarding-Sabot (APFSDS) round, using a depleted uranium (DU) alloy long-rod penetrator (LRP), designated as the M829,[50] followed by improved versions. An immediate improvement, known as the M829A1, was called the "Silver Bullet" after its good combat performance during the Gulf War against Iraqi T-55s, T-62s and T-72 tanks.[51] The M829 series centers around the depleted uranium penetrator, designed to penetrate enemy armor through kinetic energy and to shatter inside the turret, doing much damage within the tank.[52] In 1998 the United States military introduced the M829A2, which has an improved depleted uranium penetrator and composite sabot petals.[53] In 2002, production began of the ($10,000 per round) M829A3 using a more efficient propellant (RPD-380 stick),[54] a lighter injection-molded sabot, and a longer (800mm) and heavier (10 kg / 22 lb) DU penetrator, which is said to be able to defeat the latest versions of Russian Kontakt-5 explosive reactive armor (ERA).[55] This variant is unofficially referred to by Abrams tank crews as the "super sabot".[56] In response to the M829A3, the Russian army designed Relikt, the most modern Russian ERA, which is claimed to be twice as effective as Kontakt-5. A further improved M829E4 round with a segmented penetrator to defeat Relikt has been under development since 2011 and was to be fielded as the M829A4 in 2015.

Both Germany and the United States have developed several other rounds. These include the German DM12 multi-purpose anti-tank projectile (MPAT), based on the technology in a high explosive anti-tank (HEAT) warhead.[45] However, it has been found that the DM12's armor-killing abilities are limited by the lack of blast and fragmentation effects, and that the round is less valuable against lightly armored targets.[57] The United States also has a MPAT type projectile, known as the M830.[58] This was later developed into the M830A1, which allows the M1 Abrams to use the round against helicopters.[59] The M1 Abrams can use the M1028 canister round, which is an anti-personnel/anti-helicopter munition, packed with over 1,000 tungsten balls.[60] The United States Armed Forces accepted a new demolition round, called the M908 Obstacle Defeating Round, based on the M830A1 MPAT, but with the proximity fuse replaced by a hardened nose cap. The cap allows the round to impact and embed itself in concrete, then exploding inside the target and causing more damage.[61]

The Israeli Army introduced a new round known as the Laser Homing Anti-Tank (LAHAT) projectile.[2] Using a semi-active laser homing guidance method, the LAHAT can be guided by the tank's crew or by teams on the ground, while the missile's trajectory can be selected to either attack from the top (to defeat enemy armor) or direct attack (to engage enemy helicopters). Furthermore, the missile can be fired by both 105-millimeter (4.1 in) and 120 mm tank guns.[62] The LAHAT has been offered as an option for the Leopard 2, and has been marketed by both Israel Military Industries and Rheinmetall to Leopard 2 users.[63] Israeli Merkavas make use of a round known as the APAM, which is an anti-personnel munition designed to release fragmentation at controlled intervals to limit the extent of damage. Fragments are shaped to have enough kinetic energy to penetrate body armor.[64]

Poland has introduced a series of projectiles for Rheinmetall's tank gun, including an armor-piercing penetrator target practice round (APFSDS-T-TP), a high-explosive round, and a high-explosive target practice (HE-TP) projectile. The ammunition is manufactured by Zakłady Produkcji Specjalnej Sp.[65]

Operators

Map with Rheinmetall 120mm operators in blue with former operators in red

Due to tank sales, Rheinmetall's L/44 tank gun has been manufactured for other nations. For example, the Leopard 2 armed with the 44 caliber long gun, has been sold to the Netherlands, Switzerland, Sweden, Spain, Austria, Denmark, Finland, and other countries.[66] Egypt had manufactured 700–800 M1A1 Abrams by 2005,[67] and in 2008 requested permission to build another 125 tanks; their M256 main guns (the US version of the L/44) were manufactured by Watervliet Arsenal.[68] The M1A1 has also been exported to Australia,[69] while the M1A2 Abrams has been exported to Saudi Arabia and Kuwait.[70]

Use of Rheinmetall's L/44 Tank Gun
Tank Designer Country Gun Users
Leopard 2 Krauss-Maffei  Germany Rheinmetall 120 mm L/44 Austria, Brazil, Canada, Chile, Denmark, Finland, Greece, Indonesia, Netherlands (former), Norway, Poland, Portugal, Singapore, Spain, Sweden, Switzerland, Turkey
M1A1 Abrams General Dynamics Land Systems  United States M256 (L/44) Australia, Egypt, Iraq, Kuwait, Saudi Arabia
Type 90 Mitsubishi Heavy Industries  Japan Rheinmetall 120 mm L/44
K1A1 Hyundai Rotem  South Korea KM256

The Leopard 2A6 and its longer L/55 main gun have been exported for use by the Canadian Army, and the Netherlands upgraded part of its original fleet of Leopard 2s with the more powerful armament.[71] The British Army has tested Rheinmetall's longer gun, possibly looking to replace the current L30A1 120 mm L/55 rifled main gun on the Challenger 2.[72] Two Challenger 2s were modified to undergo firing trials.[73] World Industries Ace Corporation (WIA), a Korea-based powertrain company affiliated with Hyundai Kia Motors Group, is also producing the L/55 under license for the new K2 Black Panther, a fourth generation South Korean main battle tank.

Use of Rheinmetall's L/55 Tank Gun
Tank Designer Country Gun Proliferation
Leopard 2A6 Krauss-Maffei  Germany Rheinmetall 120 mm L/55 Canada, Finland, Greece, Netherlands, Portugal, Spain
K2 Black Panther Agency for Defense Development  South Korea Rheinmetall 120 mm L/55 South Korea
Altay (tank) Roketsan, Aselsan, Otokar, Hyundai Rotem, MKE  Turkey Rheinmetall 120 mm L/55 Turkey

See also

Weapons of comparable role, performance and era

Notes

  1. ↑ 1.0 1.1 Eshel (2005), p. 96.
  2. ↑ 2.0 2.1 Jane's Armour & Artillery Upgrades (subscription), Israel Aerospace Industries LAser Homing Anti-Tank (LAHAT) projectile (Israel), Gun-launched guided projectiles, accessed 13 November 2008
  3. ↑ http://id3486.securedata.net/fprado/armorsite/abrams.htm
  4. ↑ Rheinmetall, Leopard 2: the world's most advanced main battle tank, accessed 9 January 2009
  5. ↑ 5.0 5.1 5.2 5.3 Jane's Armour & Artillery (subscription), Rheinmetall 120 mm L44 smoothbore gun (Germany), accessed 6 November 2008, claims development began in 1964.
  6. ↑ Norman, p. 14
  7. ↑ Zaloga (1979), p. 20
  8. ↑ 8.0 8.1 Zaloga (2004), p. 5
  9. ↑ Zaloga (2004), p. 7
  10. ↑ Warford (2006), pp. 23–24
  11. ↑ Warford (2006), p. 24
  12. ↑ Warford (2006), p. 25
  13. ↑ Katz (1997), 38
  14. ↑ Green (2005), 32–33
  15. ↑ Hilmes (2001), p. 17
  16. ↑ Zaloga (1982), p. 19
  17. ↑ McNaugher (1981), p. vi
  18. ↑ Jerchel (1998), p. 5
  19. ↑ Hilmes (2001), p. 18
  20. ↑ Jerchel (1998), p. 6
  21. ↑ Jerchel (1998), pp. 6–7
  22. ↑ Jerchel (1998), p. 7
  23. ↑ Rheinmetall Defense, 120 mm L44 Tank Gun, accessed 9 November 2008; barrel length can be found by multiplying the caliber length by the caliber diameter.
  24. ↑ 24.0 24.1 Maxwell (2002), p. 82
  25. ↑ Green (2005), p. 61
  26. ↑ http://www.inetres.com/gp/military/cv/weapon/M256.html
  27. ↑ http://www.rheinmetall-defence.com/en/rheinmetall_defence/systems_and_products/weapons_and_ammunition/direct_fire/large_calibre/index.php
  28. ↑ Jerchel (1998), p. 11
  29. ↑ 29.0 29.1 29.2 Green (1992), p. 56
  30. ↑ Chait (2005), p. 12
  31. ↑ Green (2005), pp. 24–29
  32. ↑ Chait (2005), pp. 12–13
  33. ↑ Bolté (1997), p. 25
  34. ↑ Clemens (1999), p. 15; based on the United States' M256 gun.
  35. ↑ Jerchel (1998), p. 24
  36. ↑ Baryatinskiy (2006), pp. 23–25
  37. ↑ Baryatinskiy (2006), p. 14
  38. ↑ Zaloga (1993), p. 10
  39. ↑ Jerchel (1998), pp. 33–34
  40. ↑ Jerchel (1998), p. 34
  41. ↑ 41.0 41.1 Hilmes (2004), p. 76
  42. ↑ Jane's Armour & Artillery Upgrades (subscription), Rheinmetall 120 mm L55 smoothbore gun (Germany), accessed 10 November 2008
  43. ↑ Rheinmetall Defence, 120 mm L55 Tank Gun, accessed 10 November 2008
  44. ↑ Candil (2007), p. 66
  45. ↑ 45.0 45.1 Jerchel (1998), p. 22
  46. ↑ Jane's Ammunition Handbook (subscription), 105 mm M111 IMI APFSDS-T round (Israel), Tank and anti-tank guns, accessed 11 November 2008
  47. ↑ Jane's Ammunition Handbook (subscription), 120 mm DM 33A1 and DM 43A1 APFSDS-T rounds (Germany), accessed 11 November 2008
  48. ↑ Hilmes (2007), p. 93.
  49. ↑ Jane's Ammunition Handbook (subscription), 120 mm DM53 and DM63 LKE II APFSDS-T round (Germany), accessed 11 November 2008
  50. ↑ Green (2005), p. 68.
  51. ↑ Green (1992), p. 74
  52. ↑ Green (1992), pp. 76–77.
  53. ↑ Green (2005), p. 69.
  54. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  55. ↑ Green (2005), p. 70.
  56. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  57. ↑ Eshel (2005), p. 98.
  58. ↑ Green (2005), p. 71.
  59. ↑ Fogg (1994), p. 12.
  60. ↑ Green (2005), p. 72.
  61. ↑ Hilmes (2007), pp. 92–93.
  62. ↑ Gelbart (2004), pp. 40–41
  63. ↑ Eshel (2005), p. 100
  64. ↑ Eshel (2003), p. 46
  65. ↑ Brumar, 120 mm Rounds for Rh 120 L 44 Tank Gun
  66. ↑ Jerchel (1998), pp. 36–42
  67. ↑ Green (2005), p. 25
  68. ↑ Defense Industry Daily, Egypt: $889M Request for 125 M1A1 Tanks, accessed 9 November 2008
  69. ↑ Jane's Defense Weekly (subscription), Australia prepares for M1A1s, accessed 9 November 2008
  70. ↑ Green (2005), p. 34
  71. ↑ Defense Industry Daily, Tanks for the Lesson: Leopards, too, for Canada, accessed 10 November 2008
  72. ↑ Rheinmetall Defence, Rheinmetall 120 mm smoothbore technology for Britain's Challenger, accessed 10 November 2008
  73. ↑ Hilmes (2007), p. 88

References

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External links

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