SM UC-23

History
German Empire
Name	UC-23
Ordered	29 August 1915
Builder	Blohm & Voss, Hamburg
Yard number	273
Launched	29 February 1916
Commissioned	17 July 1916
Fate	Surrendered, 25 November 1918; broken up, August 1921
General characteristics
Class & type	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 (3.5 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:	41 merchant ships sunk ; (37,752 GRT); 5 auxiliary warships sunk ; (4,089 GRT); 1 merchant ship damaged ; (35 GRT); 2 merchant ships taken as prize ; (1,232 GRT); 1 auxiliary warship taken as prize ; (327 GRT);

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 29 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 46 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.

History

German Empire
Name	UC-23
Ordered	29 August 1915
Builder	Blohm & Voss, Hamburg
Yard number	273
Launched	29 February 1916
Commissioned	17 July 1916
Fate	Surrendered, 25 November 1918; broken up, August 1921
General characteristics
Class & type	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 (3.5 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:	41 merchant ships sunk (37,752 GRT) 5 auxiliary warships sunk (4,089 GRT) 1 merchant ship damaged (35 GRT) 2 merchant ships taken as prize (1,232 GRT) 1 auxiliary warship taken as prize (327 GRT)