The Shell Magnet - SMS Seydlitz

Ship's Crest

Battlecruiser Seydlitz - 1918

Though outwardly similar to the Moltke-class, SMS Seydlitz was built with a longer but slimmer hull than Moltke and with greater compartmentation and armor - her belt armor was on par with contemporary battleships. A raised forecastle made her a drier boat than her predecessors, but like them she mounted the tried and true 280mm (11") gun in 50 caliber. By this time her British adversaries were mounting 13.5"/45-cal guns, leaving Seydlitz undergunned for her size. At the Battle of Dogger Bank she took a pair of shells aft that detonated near the aft two turrets, putting them out of action and killing their crews. Only with luck and prompt damage control was a catastrophic explosion averted. In return Seydlitz damaged HMS Lion so severely that she had to be towed home. But the lesson was taken to heart by the entire German Navy and improved ammunition handling procedures instituted to ensure such a hit could not threaten an entire vessel. At Jutland Seydlitz was in the thick of it again, credited (with SMS Derfflinger) with sinking HMS Queen Mary. With hits from 21 shells 12" or larger and one torpedo, she limped home with more than 5,300 TONS of water sloshing in her hull, to the extent her bow had less than 2.5m (8 ft) of freeboard foreward when she pulled into port.

After finishing her design the German navy finally got around to building their battlecruisers in quantity instead of one's and two's while upgrading to the 305mm (12")/50-cal gun, unfortunately by the time the first of the Derfflinger-class had been commissioned, the war had begun.


Plans and Construction

Line Drawing - Top and Side Views (Koop)
Line Drawing - Side View (Koop)
Line Drawing - Top View (Koop)
Line Drawing - Side View - 1918 (Greger)
Line Drawing - Side View - 1918 (Gröner)
Armor Plan

Active Duty

Starboard Bow View while in drydock (U.S. National Archives)
Starboard Bow Aspect (U.S. National Archives)
Starboard Bow Aspect - 1913
Starboard Bow Aspect
"BRUNO" Turret and 150mm secondaries - Starboard Amidships (U.S. National Archives)
Starboard Aspect
Starboard Quarter Aspect - 1917
(L - R) "DORA" and "CAESAR" Turrets from Starboard
Starboard Quarter Aspect - From Above
View from the Quarterdeck
Port Bow Aspect
Port Bow Aspect (U.S. National Archives)

The Battle of Jutland (aka the Battle of Skagerrak) - 31 May to 1 June, 1916

Seydlitz steaming home after Jutland

Starboard Bow showing Jutland Damage
Starboard Quarter showing Jutland Damage
Port Quarter showing Jutland Damage
Port Quarterdeck showing Jutland Damage
Port forecastle showing Jutland Damage
Torpedo hit on port bow

The Final Act - Scapa Flow

Port Bow Aspect - Steaming in to Surrender - 21 November 1918 (U.S. National Archives)
Port Quarter Aspect - Steaming in to Surrender - 21 November 1918
Port Quarter Aspect - Steaming in to Surrender - 21 November 1918
Sunk at Scapa Flow - Port Side up


Project Name: Heavy Cruiser J
Builder: Blohm & Voss, Hamburg
Laid Down: February 4, 1911
Launched: March 30, 1912
Commissioned: May 11, 1913
Sunk: June 21, 1919 (Scuttled at Jutland)
Scrapped: Raised November, 1928 - Scrapped 1930
Displacement: 24,988 tonnes (designed) / 28,550 tonnes (maximum)
Dimensions (meters): 200.6 (overall) x 28.5 x 9.29
Dimensions (feet): 661.98 (overall) x 94.05 x 30.66
# of Shafts: 4
# of Propeller Blades: 3 (3.88m diameter)
# of Rudders: 2 (tandem - one ahead of the other)
Max Speed/Range: 26.5 kts / 4,200 nm at 14 kts
Main Battery: Ten 280mm (11")/50 caliber - 5 twin turrets
Secondary Battery: Twelve 150mm (5.9")/45 caliber - 12 casement mounts (Goeben only had 10 after 1915)
AA Battery: Twelve 88mm (3.5")/45 caliber - single mounts
Torpedo Tubes: Four 50cm tubes (all underwater - one bow, one stern [portside], one mounted on each side just forward of "Anton" turret)
Complement: 43 officers and 1,025 enlisted (as designed)


Naval Weapons of the World German Naval Guns
Naval Weapons of the World Pre-World War II German Torpedoes
German Kriegsmarine Encyclopedia

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