SM UC-20

History
German Empire
Name	UC-20
Ordered	29 August 1915
Builder	Blohm & Voss, Hamburg
Yard number	270
Launched	1 April 1916
Commissioned	7 September 1916
Fate	Surrendered, 16 January 1919; broken up, 1919 – 20
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:	Pola / Mittelmeer / Mittelmeer I Flotilla; 11 December 1916 – 11 November 1918;
Commanders:	Kptlt. Franz Becker; 8 September 1916 – 8 May 1917; Oblt.z.S. Hans Adalbert von der Lühe; 9 May – 12 December 1917; Oblt.z.S. Otto Kümpel; 13 December 1917 – 10 January 1918; Oblt.z.S. Heinrich Kukat; 1 April – 18 June 1918; Oblt.z.S. Hermann Rohne; 19 June – 29 November 1918;
Operations:	13 patrols
Victories:	21 merchant ships sunk ; (20,927 GRT); 3 merchant ships damaged ; (11,554 GRT);

SM UC-20 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 1 April 1916. She was commissioned into the German Imperial Navy on 7 September 1916 as SM UC-20. In 13 patrols UC-20 was credited with sinking 21 ships, either by torpedo or by mines laid. UC-20 was surrendered on 16 January 1919 and broken up at Preston in 1919–20.

History

German Empire
Name	UC-20
Ordered	29 August 1915
Builder	Blohm & Voss, Hamburg
Yard number	270
Launched	1 April 1916
Commissioned	7 September 1916
Fate	Surrendered, 16 January 1919; broken up, 1919 – 20
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:	Pola / Mittelmeer / Mittelmeer I Flotilla 11 December 1916 – 11 November 1918
Commanders:	Kptlt. Franz Becker 8 September 1916 – 8 May 1917 Oblt.z.S. Hans Adalbert von der Lühe 9 May – 12 December 1917 Oblt.z.S. Otto Kümpel 13 December 1917 – 10 January 1918 Oblt.z.S. Heinrich Kukat 1 April – 18 June 1918 Oblt.z.S. Hermann Rohne 19 June – 29 November 1918
Operations:	13 patrols
Victories:	21 merchant ships sunk (20,927 GRT) 3 merchant ships damaged (11,554 GRT)