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, 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 (3.46 in) Uk L/30 deck gun
Notes:	35-second diving time
Service record
Part of:	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:	61 merchant ships sunk (107,540 GRT) 17 merchant ships damaged (74,089 GRT) 2 warships sunk (3,210 tons) 1 warship damaged (1,250 tons)

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 61 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.

A German Type UC II submarine, UC-71 had a displacement of 427 tonnes (420 long tons) when at the surface and 508 tonnes (500 long tons) while submerged. She had a length overall of 50.35 m (165 ft 2 in), a beam of 5.22 m (17 ft 2 in), and a draught of 3.64 m (11 ft 11 in). The submarine was powered by two six-cylinder four-stroke diesel engines each producing 300 metric horsepower (220 kW; 300 shp) (a total of 600 metric horsepower (440 kW; 590 shp)), two electric motors producing 620 metric horsepower (460 kW; 610 shp), and two propeller shafts. She had a dive time of 48 seconds and was capable of operating at a depth of 50 metres (160 ft).

The submarine had a maximum surface speed of 12 knots (22 km/h; 14 mph) and a submerged speed of 7.4 knots (13.7 km/h; 8.5 mph). When submerged, she could operate for 52 nautical miles (96 km; 60 mi) at 4 knots (7.4 km/h; 4.6 mph); when surfaced, she could travel 10,420 nautical miles (19,300 km; 11,990 mi) at 7 knots (13 km/h; 8.1 mph). UC-71 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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