These weapons armed the last of the German pre-deadnoughts. Two ships of the Deutschland Class (not to be confused with the famous "Panzerschiffes" of World War II) were still in service with this gun during World War II. These guns were also used as Coastal Artillery during World War II in the Graf Spee battery located at Wangerooge and later at Brest.
This was a built-up design and used a horizontal wedge breech mechanism.
These were the last large-caliber German guns not to use separate main and fore charges, all propellant was in a single Hülsenkartusche cartridge case. The same Hülsenkartusche was used as the main charge for the 28 cm SK L/45 and 28 cm SK L/50 guns.
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 (11") SK L/40|
|Ship Class Used On||Braunschweig and Deutschland (1904) Classes|
|Date Of Design||1902|
|Date In Service||1904|
|Gun Weight||99,870 lbs. (45,300 kg) including BM|
|Gun Length oa||440.9 in (11.200 m)|
|Bore Length||409.5 in (10.401 m)|
|Chamber Volume||7,512 in3 (125.3 dm3)|
|Rate Of Fire||about 2 rounds per minute|
|Projectile Types and Weights 1||World War I
AP L/2,6 2: 530.7 lbs. (240.7 kg)
HE L/2,9 base fuze: 529 lbs. (240 kg)
CI L/2,9 base fuze: 529 lbs. (240 kg)
|Bursting Charge||AP L/2,6: N/A
HE L/2,9 base fuze: 35.6 lbs. (16.1 kg)
CI L/2,9 base fuze: 11.64 lbs. (5.3 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)
CI L/2,9 base fuze: 32.3 in (82.1 cm)
HE L/4,3 base fuze: 47.4 in (120 cm)
HE L/4,1 nose fuze: 45.2 in (115 cm)
HE L/4,4 base and nose fuze: 49.0 in (124.5 cm)
|Propellant Charge 5 6||Before World War I: N/A (probably RPC/06)
World War I: About 161 lbs. (73 kg) RPC/12
World War II: 154.3 lbs. (70 kg) RPC/38
|Cartridge Case Size and Weight 7||283 x 1271 mm
Loaded w/RPC/32: 262.3 lbs. (119 kg)
|Muzzle Velocity||AP L/2,6: 2,690 fps (820 mps)
HE L/4,3: 2,690 fps (820 mps)
HE L/4,1: 2,690 fps (820 mps)
HE L/4,4: 2,428 fps (740 mps)
|Working Pressure||20.3 tons/in2 (3,200 kg/cm2)|
|Approximate Barrel Life||N/A|
|Ammunition stowage per gun||Braunschweig and Deutschland: 85 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 HE L/4,3 base fuze 28 cm Spgr. L/4,3 Bdz (m.Hb) HE L/4,1 nose fuze 28 cm Spgr. L/4,1 Kz (m.Hb) HE L/4,4 base and nose fuze 28 cm Spgr. L/4,4 Bdz u. Kz (m.Hb)
- ^The AP L/2,6 was about 2crh.
- ^These were the last large-caliber German guns not to use separate main and fore charges, all propellant was in a single Hülsenkartusche cartridge case.
- ^Propellant weights differ in many references and even in official documents such as the M.Dv. Nr. 170 and M.Dv. Nr. 190 series. This seems to be the result of most charges being listed as "zu etwa" which means "to about," implying that the propellant weights were not closely controlled and that differences of a kilogram or so were acceptable. In addition, different loading weights were used depending upon the powder grain size utilized to make up the charge. The weights in this table are for the powder grain specified.
(Max elevation of turret)
|20,590 yards (18,830 m)|
|Range||Side Armor||Deck Armor|
|13,120 yards (12,000 m)||6.3 in (160 mm)||---|
Data from "Die Geschichte der deutschen Schiffsartillerie."
Braunschweig (2) and Deutschland (2): Drh.L. C/01
|Weight||382 tons (389 mt)|
|Elevation||-4 / +30 degrees|
|Train||about +150 / -150 degrees|
- These turrets were hydraulically operated using steam-driven pumps. Shells and cartridges had a common handling room at the bottom of the barbette. There were two pusher hoists for each mounting that alternatively lifted both the projectile and the cartridge. These went into a tray and were manually rammed.
- Gun axes were 70.9 inches (180 cm) apart.
- Armor thickness as given in "Naval Weapons of World War One:"
Face Braunschweig: 9.8 in (25.0 cm)
Face Deutschland: 11.0 in (28.0 cm)
Side: 9.8 in (25 cm)
Roof: 2.0 in (5 cm)
"Jutland: An Analysis of the Fighting" and "Naval Weapons of World War Two" both by John Campbell
"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
"German Capital Ships of World War Two" by M.J. Whitley
"Munitionsvorschriften für die Kriegsmarine - Panzersprenggranaten (Psgr)" M.Dv. Nr. 190,1A2 by Oberkommando der Kriegsmarine
"Munitionsvorschriften für die Kriegsmarine - Sprenggranaten (Spgr)" M.Dv. Nr. 190,1A3 by Oberkommando der Kriegsmarine
"Munitionsvorschriften für die Kriegsmarine - Hülsenkartusche" M.Dv. Nr. 190,4A1 by Oberkommando der Kriegsmarine
Special help from Richard Worth, Bernard Sage and Thorsten Wahl
13 October 2006 - Benchmark
25 March 2009 - Added Kurfürst Friedrich Wilhelm class
27 March 2009 - Added picture of Kurfürst Friedrich Wilhelm
05 February 2011 - Distinguished between KL/40 and SK L/40 types
20 November 2012 - Split up KL/40 and SK L/40 datapages
28 February 2016 - Minor edits
05 March 2019 - Converted to HTML 5 format, reorganized notes and added data and sketches from M.Dv. Nr. 190,1A2 M.Dv. Nr. 190,1A3 and M.Dv. Nr. 190,4A1
07 March 2020 - Corrected propellant error
04 March 2021 - Added CI shell and burster information, details and notes to Mount / Turret Data