Derfflinger-class battlecruiser

SMS Derfflinger
Class overview
Name:	Derfflinger
Operators:	Kaiserliche Marine
Preceded by:	SMS Seydlitz
Succeeded by:	Mackensen class
Completed:	3
Lost:	1
General characteristics
Type:	Battlecruiser
Displacement:	26,600 t (26,200 long tons) normal load 31,200 t (30,700 long tons) full load
Length:	210.40 m (690 ft 3 in) overall
Beam:	29 m (95 ft 2 in)
Draft:	9.20 m (30 ft 2 in)
Installed power:	14 coal-fired boilers 8 oil-fired boilers 62,138 shp (46,336 kW)
Propulsion:	2 sets marine-type turbines
Speed:	26.5 knots (49.1 km/h; 30.5 mph)
Range:	5,600 nmi (10,400 km; 6,400 mi) at 14 knots (26 km/h; 16 mph) Hindenburg: 6,100 nmi (11,300 km; 7,000 mi) at 14 knots (26 km/h; 16 mph)
Complement:	44 officers 1,068 enlisted men
Armament:	8 × 30.5 cm SK L/50 (12"/50 cal) main guns in 4 twin turrets 12 × 15 cm SK L/45 (5.9"/45 cal) single guns (14 in Lützow & Hindenburg) 12 × single 8.8 cm (3.5"/45 cal) guns (after 1916 only 2 in Derfflinger and 4 in Hindenburg) 4 × 50 cm (19.7") torpedo tubes (60 cm/23.6" in Lützow & Hindenburg)
Armor:	Belt: 100–300 mm (3.9–11.8 in) Turrets: 270 mm (11 in) Conning tower: 300 mm (12 in)

The Derfflinger class was a class of three battlecruisers (German: Schlachtkreuzer) of the Imperial German Navy. The ships were ordered for the 1912–13 Naval Building Program of the German Imperial Navy as a reply to the Royal Navy's three new Lion-class battlecruisers that had been launched a few years earlier. The preceding Moltke class and the incrementally improved Seydlitz represented the end of the evolution of Germany's first generation of battlecruisers. The Derfflinger class had considerable improvements, including a larger primary armament, all of which was mounted on the centerline, eliminating the restricted arc of the amidships turret. The ships were also larger than the preceding classes. The Derfflinger class used a similar propulsion system, and as a result of the increased displacement were slightly slower.

The class comprised three ships: Derfflinger, Lützow, and Hindenburg. All three of the ships saw active service with the High Seas Fleet during World War I. Derfflinger was commissioned shortly after the outbreak of war, and was present at most of the naval actions in the North Sea, including the battles of Dogger Bank and Jutland. Lützow was commissioned in August 1915, and only participated in the raid on Yarmouth before being sunk at Jutland. Hindenburg was commissioned into the fleet in May 1917, and saw no major action. Derfflinger and Hindenburg were interned at Scapa Flow following the armistice in November 1918. Rear Admiral Ludwig von Reuter, who was in command of the interned High Seas Fleet, ordered the ships to be scuttled in an attempt to prevent their possible seizure by the Royal Navy.

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