28 cm/40 (11") MRK L/40
Used on pre-dreadnoughts of the Kurfürst Friedrich Wilhelm class. The mixture of both L/35 and L/40 guns on these ships shows how centralized fire control was not yet available for these ships, even though they had a "uniform" main battery.
These guns were built from hoops and used a horizontal wedge breech mechanism.
These mountings used hydraulic power with steam pumps as prime movers. The breech mechanisms were hand-worked as was the ramming.
All German 28 cm guns had an actual bore diameter of 28.3 cm (11.1").
|Designation||28 cm/40 (11") MRK L/40|
|Ship Class Used On||Kurfürst Friedrich Wilhelm class|
|Date Of Design||1890|
|Date In Service||1893|
|Gun Weight||97,000 lbs. (44,000 kg) including BM|
|Gun Length oa||440.9 in (11.200 m)|
|Bore Length||409.5 in (10.401 m)|
|Chamber Volume||8,723 in3 (142.9 dm3)|
|Rate Of Fire||about 0.5 rounds per minute|
|Projectile Types and Weights 1||AP L/2,6 2 : 530.7 lbs. (240.7 kg)
HE L/2,9 base fuze: 529 lbs. (240 kg)
|Projectile Length||AP L/2,6: 29.0 in (73.6 cm)
HE L/2,9 base fuze: 32.3 in (82.1 cm)
|Propellant Charge 4||World War I: About 161 lbs. (73 kg) RPC 12|
|Muzzle Velocity||2,690 fps (820 mps)|
|Approximate Barrel Life||N/A|
|Ammunition stowage per gun||Kurfürst Friedrich Wilhelm: 60 rounds|
Actual designations for Projectiles AP L/2,6 28 cm Psgr. L/2,6 HE L/2,9 base fuze 28 cm Spgr. L/2,9 Bdz
- ^The AP L/2,6 was about 2crh.
- For a sketch of the AP L/2,6, please see the 28 cm SK L/40 datapage.
- ^As originally introduced, these guns used brown powder.
(Max elevation of turret)
|17,400 yards (15,900 m)|
"Die Geschichte der deutschen Schiffsartillerie" says that the effective range of this gun when introduced was 12,030 yards (11,000 m).
|Range||Side Armor||Deck Armor|
|13,120 yards (12,000 m)||6.3 in (160 mm)||---|
Data from "Die Geschichte der deutschen Schiffsartillerie."
"Naval Weapons of World War One" by Norman Friedman
"Conway's All the World's Fighting Ships: 1906-1922" by Randal Gray and Robert Gardiner (Editor)
"German Warships 1815-1945" by Erich Gröner
"The Big Gun: Battleship Main Armament 1860-1945" by Peter Hodges
"Die Geschichte der deutschen Schiffsartillerie" by Paul Schmalenbach
"Munitionsvorschriften für die Kriegsmarine - Panzersprenggranaten (Psgr)" M.Dv. Nr. 190,1A2 by Oberkommando der Kriegsmarine
21 November 2012 - New datapage
15 December 2013 - Added photograph of Weissenburg
23 February 2019 - Converted to HTML 5 format, reorganized notes and added data from M.Dv. Nr. 190,1A2
01 April 2021 - Added another photograph of Weissenburg