Type U 23 submarine

Class overview
Builders	Germaniawerft, Kiel
Operators	Imperial German Navy
Preceded by	Type U 19
Succeeded by	Type U 27
Completed	4
Lost	2
General characteristics [1]
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)
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

Type U 23 was a class of U-boats built during World War I by the Kaiserliche Marine. Four Boats were ordered from Germaniawerft on 18 March 1911.^[2]

• Gröner, Erich; Jung, Dieter; Maass, Martin (1991). German Warships 1815–1945, U-boats and Mine Warfare Vessels. Vol. 2. Translated by Thomas, Keith; Magowan, Rachel. London: Conway Maritime Press. ISBN 0-85177-593-4.
• Möller, Eberhard; Brack, Werner (2004). The Encyclopedia of U-Boats. London: Chatham. ISBN 1-85367-623-3.
• Rössler, Eberhard (2001). The U-boat: The evolution and technical history of German submarines. London: Cassell & Co. ISBN 0-304-36120-8.