M839

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M839


Soltam M839 gun

General Information
Military designation: M839
Manufacturer designation: M839, Model 839, Soltam M839
Manufacturer country: IsraelIsrael Israel
Developer / Manufacturer: Soltam (now Elbit Systems )
Start of production: 1984
Model variants: M839, M839P, M845, M845P
Weapon Category: Field howitzer
Team: 8th
Technical specifications
Overall length: 7.70 m
(ready to fire)
Pipe length: 6.67 m
(with lock)
Caliber :

155 mm

Caliber length : L / 39
Weight ready for use: 10,850 kg
Cadence : 2-5 rounds / min
Elevation range: −3 ° to 70 degrees
Side straightening area: ± 39 °
Furnishing
Closure Type : horizontal wedge lock
Charging principle: manually
Ammunition supply: manually with loading aid
Drive: Diesel auxiliary engine with 60 kW
Power supply: Diesel auxiliary engine

The M839 is a field howitzer in caliber 155 mm from Israel .

Development history

From the 1960s, the Israeli arms company Soltam (now Elbit Systems ) developed artillery pieces for Israel and the export market together with Tampella from Finland . The first model was the M-68 cannon howitzer with 33 caliber lengths (L / 33). The improved M-71 version with 39 caliber lengths (L / 39) followed in the mid-1970s . Based on the M-71 draft, the improved M839 cannon howitzer was developed in the early 1980s . The gun was first presented in 1983. Series production of the M839 began in 1984.

variants

  • M839 : Version with 39 caliber lengths (L / 39)
  • M839P : Version of the M839 with auxiliary motor
  • M845 : Version with the GC-45 gun barrel with 45 caliber lengths (L / 45)
  • M845P : Version of the M845 with auxiliary motor

technology

The M839 is an improved version of the M-71. It uses the same L / 39 gun barrel. Compared to the previous model, the M839 has a modified carriage, has a loading aid and can optionally be equipped with an auxiliary motor (M839P) and loading crane. The M839 is a conventional field howitzer with a power train system. It shows the usual pattern of a four-wheeled spreading carriage with an optional auxiliary motor for short-term self-propulsion. The M839 weighs 10,850 kg. The length of the M839 varies between 7.50 m when pulled and 10.50 m when ready to fire. The gun is built flat and the height (due to the gun barrel) is 2.10 m in the drawn position. The width on the carriageway is 2.20 m.

gun

The gun barrel is made of high-strength steel . A smoke extractor is attached about halfway along the gun barrel . The gun barrel is housed on a two-axle carriage with two spreader bars . The carriage is made of steel. With the barrel cradle , two barrel brakes and barrel retrievers are mounted on the gun barrel . Next to it is the place for the alignment device. The semi-automatic, horizontal wedge lock and the cargo chamber are attached to the end of the pipe . A loading aid is mounted on the loading chamber and pushes the projectile into the chamber. During transport, the bars are folded back and rest on two auxiliary wheels for transport. In the driving position, the gun barrel is swiveled 180 ° over the spars in the direction of travel. Medium-weight trucks are used for transport . The maximum permissible train speed is 100  km / h on the road. A diesel auxiliary engine from Deutz AG is attached to the left stile . The engine has an output of 60 kW . Next to the engine is a seat with a joystick and other controls. The auxiliary motor is used to lift the main wheels after lowering the base plate, to steer the support wheels and to lift them when the tractor is operating, and to spread and close the bars. The gun can also be driven into the firing position with the auxiliary engine at a maximum of 17  km / h . The auxiliary motor can also be used when changing position. A loading crane is also optionally available on the right side rail, with which the projectiles can be lifted from the floor to the bolt.

The six to eight-person operating team needs a few minutes to make the gun ready to fire or drive. When shooting, the main wheels are raised and the front of the M839 is supported on a shooting platform that is lowered from the lower mount. At the end of the spars two selbsteingrabende are Erdsporne mounted that the recoil force derived in the soil. In addition, the recoil is reduced by a two-chamber muzzle brake. The lateral straightening range is 39 ° on each side. The elevation range is −3 to + 70 °.

The loading process with the semi-automatic shutter and the loading aid enables a short-term firing rate of five shots per minute. Then the rate of fire must be reduced to two rounds per minute due to the thermal stress on the gun barrel.

ammunition

The M839 uses separately charged ammunition with variable propellant charge bags (zone charges). This means that the projectile and the propellant charge are loaded one after the other. IMI Systems offers bullets with the M839 . In addition, the M839 can fire almost all 155 mm NATO ammunition .

The Israeli M839 use the following ammunition from IMI Systems:

Surname Bullet type filling Shooting distance
M107-A3 HE grenade 6.6 kg TNT 21.9 km
M483 HE grenade (pre-fragmented) TNT 23.5 km
M395 Cargo floor 63 M85 bombets 23 km
M396 Cargo floor with base bleed 49 M85 bombets 28.5 km
M481 HE-ER BT HE grenade with hollow bottom 10.5 kg of TNT 26 km
M401 HE-ER-BB HE grenade with base bleed 12 kg TNT 28.5 km
M549 RAP Rocket-propelled HE grenade 7.3 kg Composition B 30 km

Technical data

Next are available for the M839 smoke projectiles , flares and Military Exercise and practice shells available.

distribution

literature

  • Christopher Chant: A Compendium of Armaments and Military Hardware. Routledge Revivals, Oxford, United Kingdom, 2014, ISBN 0-415-71072-3 .
  • Christopher F. Foss : Modern combat weapons. Stocker-Schmid Verlag AG, Dietikon, Switzerland, 1998, ISBN 3-7276-7092-4 .
  • Jeff Kinard: Artillery: An Illustrated History of Its Impact (Weapons and Warfare). ABC-CLIO, 2007, ISBN 1-85109-556-X .
  • Ove Dullum: Cluster weapons - military utility and alternatives. Forsvarets forskningsinstitutt / Norwegian Defense Research Establishment (FFI), 2008.
  • Ove Dullum: M85 - An analysis of reliability. Forsvarets forskningsinstitutt / Norwegian Defense Research Establishment (FFI), 2007.
  • Marshall Cavendish: The Directory of the World's Weapons. Aerospace Publishing, 1996, ISBN 1-85605-348-2 .

Individual evidence

  1. ↑ a b c d e f g Model 839. In: www.army-guide.com. Army Guide, accessed August 20, 2019 .
  2. ↑ a b Christopher F. Foss: Modern combat weapons. 1998, p. 141.
  3. ^ A b c Jeff Kinard: Artillery: An Illustrated History of Its Impact (Weapons and Warfare). 2007, pp. 312-313.
  4. ^ A b c Marshall Cavendish: The Directory of the World's Weapons. 1996, p. 30.
  5. ↑ a b c d e f Christopher Chant: A Compendium of Armaments and Military Hardware. 2014, p. 86.
  6. ↑ a b c IMI Systems - Artillery Ammunition. In: imisystems.com. IMI Systems, accessed August 20, 2019 .
  7. ↑ Ove Dullum: Cluster weapons - military utility and alternatives. 2009, p. 121.
  8. ↑ Ove Dullum: M85 - An analysis of reliability. 2007, p. 44.
  9. ↑ a b Trade Register at sipri.org , Retrieved August 20, 2019
  10. ^ The International Institute for Strategic Studies (IISS): The Military Balance 2018 . 1st edition. Routledge, London 2018, ISBN 978-1-85743-955-7 , pp. 341 (English, as of January 2018).
  11. ^ The International Institute for Strategic Studies (IISS): The Military Balance 2018 . 1st edition. Routledge, London 2018, ISBN 978-1-85743-955-7 , pp. 287 (English, as of January 2018).
  12. ^ The International Institute for Strategic Studies (IISS): The Military Balance 2018 . 1st edition. Routledge, London 2018, ISBN 978-1-85743-955-7 , pp. 493 (English, as of January 2018).