28 cm MRK L/40

28 cm MRK L/40
The Ottoman battleship Barbaros Hayreddin or Turgut Reis.
Type Naval gun
Railway gun
Place of origin German Empire
Service history
Used by German Empire
Ottoman Empire
Wars Boxer Rebellion
World War I
Production history
Designer Krupp
Designed 1891
Manufacturer Krupp
Specifications
Weight 44 t (43 long tons; 49 short tons)
Length 11.2 m (36 ft 9 in) L/40
Barrel length 10.4 m (34 ft 1 in)[1]
Shell Separate-loading, bagged charge and projectile
Shell weight 240 kg (530 lb)
Caliber 283 mm (11.1 in)[1]
Breech Horizontal sliding-wedge
Elevation -5° to +25°
Traverse -150° to +150°[2]
Rate of fire 1 round every two minutes
Muzzle velocity 715 m/s (2,350 ft/s)
Effective firing range 11 km (6.8 mi) at 25°
Maximum firing range 15 km (9.3 mi) at 25°[1]

The 28 cm MRK L/40 was a German naval gun that was used in World War I as the primary armament of the Brandenburg-class pre-dreadnought battleships. Some were also converted to railway guns during World War I.

Design

The 28 cm MRK L/40 gun was a built-up gun made from three layers of reinforcing hoops. It used a cylindro-prismatic horizontal sliding breech, but unlike later Krupp guns it did not use a metallic cartridge case. Instead, it used separate loading bagged charges and projectiles.[1]

The four ships of the Brandenburg class had a slightly unusual arrangement for their primary armament. Although the primary armament consisted of six 28 cm guns in three twin gun turrets that all fired the same ammunition, the fore and aft turrets had 28 cm MRK L/40 guns, while the amidships turret had 28 cm MRK L/35 guns due to space constraints. The ships did not have centralized fire control and each gun type had different ballistics. The L/35 guns had a muzzle velocity of 685 m/s (2,250 ft/s) and a maximum range of 14.45 km (8.98 mi) vs 715 m/s (2,350 ft/s) and a maximum range of 15 km (9.3 mi) for the L/40 guns.[1]

Railway artillery

When the two Brandenburg-class ships still in German service SMS Brandenburg and SMS Wörth were relegated to training duties in 1915 six of the L/40 guns were transferred to the Army where they were known as 28 cm K L/40 "Kurfürst" guns. These were installed on Eisenbahn und Bettungsschiessgerüst (E. u. B.) (railroad and firing platform) mounts successfully used by other German railroad guns. Unlike every other large German railroad gun, it used a massive rectangular cradle for its gun.[3]

The six "Kurfürst" guns entered service in early 1918, participating in the German Spring Offensive and the subsequent defensive operations.[3] They were organized into Batteries 393, 434, 722 and the First through Third Batteries of Bavarian Foot Artillery Battalion (1.-3./Bayerische Fußartillerie-Batallion) 29 with one gun each.[4] All six were destroyed in 1921–22 by the Military Inter-Allied Commission of Control.[5]

Ammunition

Before and during World War I, the gun used about 56.6 kg (125 lb) of RP C/12 (Rohr-Pulver – tube powder)[2] propellant that was a mix of nitrocellulose, nitroglycerin and small amounts of other additives with a calorific value of 950 and an uncooled explosion temperature of 2,975 kelvins.[6]

Shell name Weight Filling Weight Armor Penetration
Armor-piercing shell (Panzergrenate L/2.6) 240 kg (530 lb) unknown 160 mm (6.3 in) at 13.12 km (8.15 mi).
High-explosive shell (Sprenggranate L/2.9) 240 kg (530 lb) 15.9 kg (35 lb) HE unknown[2]

References

  1. 1 2 3 4 5 Friedman, Norman (2011). Naval Weapons of World War One. S. Yorkshire: Seaforth Pub. p. 137. ISBN 9781848321007. OCLC 751804655.
  2. 1 2 3 DiGiulian, Tony. "28 cm/40 (11") MRK L/40". www.navweaps.com. Retrieved 2018-08-19.
  3. 1 2 François, p. 32
  4. ↑ François, p. 12
  5. ↑ François, p. 47
  6. ↑ Campbell, John (1985). Naval weapons of World War Two. Annapolis, Md.: Naval Institute Press. p. 21. ISBN 0870214594. OCLC 13085151.

Bibliography

  • François, Guy. Eisenbahnartillerie: Histoire de l'artillerie lourd sur voie ferrée allemande des origines à 1945. Paris: Editions Histoire et Fortifications, 2006
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