Description

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").

Gun Characteristics

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)
Rifling Length N/A
Grooves N/A
Lands N/A
Twist N/A
Chamber Volume 7,512 in3 (125.3 dm3)
Rate Of Fire about 2 rounds per minute

Ammunition

Type Separate
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)

World War II
    HE L/4,3 base fuze: 529 lbs. (240 kg)
    HE L/4,1 nose fuze: 529 lbs. (240 kg)
    HE L/4,4 base and nose fuze 3 4: 626 lbs. (284 kg)

Bursting Charge N/A
Projectile Length AP L/2,6: 29.0 in (73.6 cm)
HE 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 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
Empty: N/A
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.
  • ^There were at least three different models of the HE L/4,4 base and nose fuze projectile. The one listed here was the heaviest with the others being one or two kilograms lighter. See sketch on the 28 cm SK L/50 datapage.
  • ^German HE Base and Nose Fuzed projectiles with ballistic caps had a rod between the nose of the shell and the fuze to improve performance when striking obliquely. See details on 12.7 cm SK C/34 datapage.
  • ^These guns, like most large caliber German guns of this era, used a "fore charge" which was propellant in a double bag silk case and a "main charge" which was propellant in a brass case. The brass case helped to seal the breech of the gun.
  • ^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.
  • ^During World War I the same cartridge case was used for the 28 cm SK L/40, 28 cm SK L/45 and 28 cm SK L/50 guns. During World War II it appears that the same cartridge case was still used for these three guns and for the newer 28 cm SKC/28 and 28 cm SKC/34 guns.

Range

World War I

Range with 530.7 lbs. (240.7 kg) AP L/2,6
Elevation Distance
30 degrees
(Max elevation of turret)
20,590 yards (18,830 m)

World War II

Range with 626 lbs. (284 kg) HE L/4,4
Elevation Distance
30 degrees
(Max elevation of turret)
28,040 yards (25,640 m)
Coast Defense Gun
Range @ 45 degrees
30,350 yards (27,750 m)

Armor Penetration

Armor Penetration with 530.7 lbs. (240.7 kg) AP L/2,6
Range Side Armor Deck Armor
13,120 yards (12,000 m) 6.3 in (160 mm) ---

Data from "Die Geschichte der deutschen Schiffsartillerie."

Mount / Turret Data

Designation Two-gun turrets
    Braunschweig (2) and Deutschland (2): Drh.L. C/01
Weight N/A
Elevation -4 / +30 degrees
Elevation Rate N/A
Train about +150 / -150 degrees
Train Rate N/A
Gun recoil N/A
Loading Angle N/A

Additional Pictures

Sources

"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
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"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
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Special help from Richard Worth, Bernard Sage and Thorsten Wahl

Page History

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