German Type U 23 submarine

History
German Empire
Name:	U-23
Ordered:	18 March 1911
Builder:	Friedrich Krupp Germaniawerft, Kiel
Cost:	2,808,000 Goldmark
Yard number:	177
Laid down:	21 December 1911
Launched:	12 April 1912
Commissioned:	11 September 1913
Fate:	20 July 1915 - torpedoed and sunk off Fair Isle, Scotland, by HMS C27
General characteristics Ocean-going diesel submarine
Class and type:	German Type U 23 submarine
Displacement:	669 t (658 long tons) surfaced 864 t (850 long tons) submerged
Length:	64.70 m (212.3 ft)
Beam:	6.32 m (20 ft 9 in)
Draught:	3.45 m (11 ft 4 in)
Propulsion:	2 shafts 2 × Germania 6-cylinder two stroke diesel motors with 1,800 PS (1,320 kW; 1,780 shp) 2 × SSW double Motordynamos with 1,200 PS (880 kW; 1,180 shp) 450rpm surfaced 330 rpm submerged
Speed:	16.7 knots (30.9 km/h; 19.2 mph) surfaced 10.3 knots (19.1 km/h; 11.9 mph) submerged
Range:	9,910 nmi (18,350 km; 11,400 mi) at 8 knots (15 km/h; 9.2 mph) surfaced 85 nmi (157 km; 98 mi) at 5 knots (9.3 km/h; 5.8 mph) submerged
Test depth:	about 50 m (160 ft)
Boats & landing craft carried:	1 dingi
Complement:	4 officers, 31 men
Armament:	4 × 50 cm (19.7 in) torpedo tubes (2 each bow and stern) 6 torpedoes 1 × 8.8 cm (3.5 in) SK L/30 gun
Service record
Part of:	Imperial German Navy IV Flotilla 1 August 1914 - unknown end III Flotilla unknown start – 20 July 1915
Commanders:	Kptlt. Erwin Weisbach 1 August – 25 November 1914 Kptlt. Hans Adam 26 November – 17 December 1914 Kptlt. Egewolf Freiherr von Berckheim 18 December 1914 – 12 January 1915 Kptlt. Hans Schultheß 13 January – 20 July 1915
Operations:	3 patrols
Victories:	7 ships sunk (8,822 GRT)

SM U-23 was one of the 329 U-boats serving in the Imperial German Navy in World War I.

U-23 was engaged in the naval warfare and took part in the First Battle of the Atlantic.

U-23 served on three war patrols, sinking a total of seven ships for 8,822 gross register tons (GRT). She was baited by the Q ship Princess Louise and torpedoed by HMS C27 at 58°55′N 0°14′E / 58.917°N 0.233°E / 58.917; 0.233Coordinates: 58°55′N 0°14′E / 58.917°N 0.233°E / 58.917; 0.233, off Fair Isle, in Shetland, Scotland. Twenty four men died and 10 survived.

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