SM UC-71

History
German Empire
Name	UC-71
Ordered	12 January 1916
Builder	Blohm & Voss, Hamburg
Yard number	287
Launched	12 August 1916
Commissioned	28 November 1916
Fate	Sunk on way to surrender, 20 February 1919
General characteristics
Class and type	German Type UC II submarine
Displacement	427 t (420 long tons), surfaced; 508 t (500 long tons), submerged;
Length	50.35 m (165 ft 2 in) o/a; 40.30 m (132 ft 3 in) pressure hull;
Beam	5.22 m (17 ft 2 in) o/a; 3.65 m (12 ft) pressure hull;
Draught	3.64 m (11 ft 11 in)
Propulsion	2 × propeller shafts; 2 × 6-cylinder, 4-stroke diesel engines, 600 PS (440 kW; 590 shp); 2 × electric motors, 620 PS (460 kW; 610 shp);
Speed	12.0 knots (22.2 km/h; 13.8 mph), surfaced; 7.4 knots (13.7 km/h; 8.5 mph), submerged;
Range	10,420 nmi (19,300 km; 11,990 mi) at 7 knots (13 km/h; 8.1 mph) surfaced; 52 nmi (96 km; 60 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:	Flandern / Flandern II Flotilla; 3 March 1917 – 13 October 1918; I Flotilla; 13 October – 11 November 1918;
Commanders:	Oblt.z.S. Hans Valentiner; 28 November 1916 – 25 April 1917; Oblt.z.S. Hugo Thielmann; 26 April – 9 June 1917; Oblt.z.S. Reinhold Saltzwedel; 10 June – 13 September 1917; Oblt.z.S. Ernst Steindorff; 14 September 1917 – 28 January 1918; Oblt.z.S. Walter Warzecha; 29 January – 13 August 1918; Oblt.z.S. Eberhard Schmidt; 14 August – 11 November 1918;
Operations:	19 patrols
Victories:	53 merchant ships sunk ; (105,217 GRT); 10 auxiliary warships sunk ; (5,533 GRT); 16 merchant ships damaged ; (73,546 GRT); 1 warship damaged ; (1,250 tons); 1 auxiliary warship damaged ; (543 GRT);

SM UC-71 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 12 January 1916 and was launched on 12 August 1916. She was commissioned into the German Imperial Navy on 28 November 1916 as SM UC-71. In 19 patrols UC-71 was credited with sinking 63 ships, either by torpedo or by mines laid. UC-71 sank on 20 February 1919 in the North Sea while on her way to be surrendered. Discovery a century later of her wreck with all hatches open suggested she had been deliberately scuttled by her own crew (all of whom survived).

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