SM UC-23

History
German Empire
Name:	UC-23
Ordered:	26 August 1915
Builder:	Blohm & Voss, Hamburg
Yard number:	273
Launched:	29 February 1916
Commissioned:	17 July 1916
Fate:	surrendered, November 1918; broken up, August 1921
General characteristics
Class and type:	German Type UC II submarine
Displacement:	417 t (410 long tons), surfaced 493 t (485 long tons), submerged
Length:	49.35 m (161 ft 11 in) o/a 39.30 m (128 ft 11 in) pressure hull
Beam:	5.22 m (17 ft 2 in) o/a 3.65 m (12 ft) pressure hull
Draught:	3.68 m (12 ft 1 in)
Propulsion:	2 × propeller shafts 2 × 6-cylinder, 4-stroke diesel engines, 500 PS (370 kW; 490 bhp) 2 × electric motors, 460 PS (340 kW; 450 shp)
Speed:	11.6 knots (21.5 km/h; 13.3 mph), surfaced 7.0 knots (13.0 km/h; 8.1 mph), submerged
Range:	9,430 nmi (17,460 km; 10,850 mi) at 7 knots (13 km/h; 8.1 mph) surfaced 55 nmi (102 km; 63 mi) at 4 knots (7.4 km/h; 4.6 mph) submerged
Test depth:	50 m (160 ft)
Complement:	26
Armament:	6 × 100 cm (39.4 in) mine tubes 18 × UC 200 mines 3 × 50 cm (19.7 in) torpedo tubes (2 bow/external; one stern) 7 × torpedoes 1 × 8.8 cm (3.46 in) Uk L/30 deck gun
Notes:	35-second diving time
Service record
Part of:	Constantinople Flotilla 6 December 1916 – 11 November 1918
Commanders:	Oblt.z.S. Johannes Kirchner 28 July 1916 - 6 July 1917 Kptlt. Freiherr Volkhard von Bothmer 5 July – 14 December 1917 Kptlt. Hans Georg Lübbe 15 December 1917 – 14 November 1918
Operations:	17 patrols
Victories:	39 merchant ships sunk (36,451 GRT) 1 merchant ship damaged (35 GRT) 6 warships sunk (5,369 tons) 3 warships taken as prizes (1,559 tons)

SM UC-23 was a German Type UC II minelaying submarine or U-boat in the German Imperial Navy (German: Kaiserliche Marine) during World War I. The U-boat was ordered on 26 August 1915 and was launched on 29 February 1916. She was commissioned into the German Imperial Navy on 17 July 1916 as SM UC-23. In 17 patrols UC-23 was credited with sinking 45 ships, either by torpedo or by mines laid. UC-23 was surrendered at Sevastopol on 25 November 1918 and broken up at Bizerta in August 1921.

Like all pre-UC-25 German Type UC II submarines, UC-23 had a displacement of 417 tonnes (410 long tons) when at the surface and 493 tonnes (485 long tons) while submerged. She had a length overall of 49.35 m (161 ft 11 in), a beam of 5.22 m (17 ft 2 in), and a draught of 3.65 m (12 ft). The submarine was powered by two six-cylinder four-stroke diesel engines each producing 250 metric horsepower (180 kW; 250 shp) (a total of 500 metric horsepower (370 kW; 490 shp)), two electric motors producing 460 metric horsepower (340 kW; 450 shp), and two propeller shafts. She had a dive time of 35 seconds and was capable of operating at a depth of 50 metres (160 ft).

The submarine had a maximum surface speed of 11.6 knots (21.5 km/h; 13.3 mph) and a submerged speed of 7 knots (13 km/h; 8.1 mph). When submerged, she could operate for 55 nautical miles (102 km; 63 mi) at 4 knots (7.4 km/h; 4.6 mph); when surfaced, she could travel 9,430 nautical miles (17,460 km; 10,850 mi) at 7 knots (13 km/h; 8.1 mph). UC-23 was fitted with six 100 centimetres (39 in) mine tubes, eighteen UC 200 mines, three 50 centimetres (20 in) torpedo tubes (one on the stern and two on the bow), seven torpedoes, and one 8.8 centimetres (3.5 in) Uk L/30 deck gun. Her complement was twenty-six crew members.

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