Type UC I submarine

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Type UC I submarine, UC-5
Class overview
Builders	AG Weser, Bremen; Vulkan Hamburg;
Operators	Imperial German Navy  Royal Netherlands Navy  Austro-Hungarian Navy  Regia Marina
Succeeded by	UC II
Built	1915
In commission	1915–1918
Planned	15
Completed	15
Lost	14
Scrapped	1
Preserved	0
General characteristics
Type	coastal minelaying submarine
Displacement	168 t (165 long tons) surfaced 183 t (180 long tons) submerged
Length	33.99 m (111 ft 6 in) o/a 29.62–29.81 m (97 ft 2 in – 97 ft 10 in) pressure hull
Beam	3.15 m (10 ft 4 in)
Height	6.30 m (20 ft 8 in)
Draught	3.04–3.06 m (10 ft 0 in – 10 ft 0 in)
Propulsion	1 shaft 6-cylinder diesel engines, 80–90 PS (59–66 kW; 79–89 bhp) Siemens-Schuckert electric motor, 175 PS (129 kW; 173 shp)
Speed	6.20–6.49 knots (11.48–12.02 km/h; 7.13–7.47 mph) surfaced 5.22–5.67 knots (9.67–10.50 km/h; 6.01–6.52 mph) submerged
Range	780–910 nmi (1,440–1,690 km; 900–1,050 mi) at 5 knots (9.3 km/h; 5.8 mph) surfaced 50 nmi (93 km; 58 mi) at 4 knots (7.4 km/h; 4.6 mph) submerged
Test depth	50 m (160 ft)
Complement	14 men
Armament	6 × 1 metre (39 in) internal tubes

The Type UC I coastal submarines were a class of small minelaying U-boats built in Germany during the early part of World War I. They were the first operational minelaying submarines in the world (although the Russian submarine Krab was laid down earlier). A total of fifteen boats were built. The class is sometimes also referred to as the UC-1 class after SM UC-1, the class leader. The Italian X-class submarine was a reverse-engineered and modified type of the UC-1-class.

These submarines were designed by Dr. Werner of the Torpedo Inspectorate, and based on the Type UB I small coastal submarines, with a revised bow section housing inclined minelaying tubes and uprated engines to compensate for the increased displacement and less streamlined form. The boats' sole armament was six internal mine tubes with 12 mines, although UC-11 was fitted with a single external torpedo tube in 1916. They were constructed very quickly, and suffered from problems with their minelaying system, which in some cases caused the mines to become armed before exiting their tubes and explode prematurely.^{[citation needed]}

Type UC I submarines had a displacement of 168 tonnes (165 long tons) when at the surface and 183 tonnes (180 long tons) while submerged. They had a length overall of 33.99 m (111 ft 6 in), a beam of 3.15 m (10 ft 4 in), and a draught of 3.04–3.06 m (10 ft 0 in – 10 ft 0 in). The submarines were powered by one Daimler-Motoren-Gesellschaft or Benz six-cylinder, four-stroke diesel engine producing 80–90 metric horsepower (59–66 kW; 79–89 shp), an electric motor producing 175 metric horsepower (129 kW; 173 shp), and one propeller shaft. They were capable of operating at a depth of 50 metres (160 ft).^[1]

The submarines had a maximum surface speed of 6.20–6.49 knots (11.48–12.02 km/h; 7.13–7.47 mph) and a maximum submerged speed of 5.22–5.67 knots (9.67–10.50 km/h; 6.01–6.52 mph). When submerged, they could operate for 50 nautical miles (93 km; 58 mi) at 4 knots (7.4 km/h; 4.6 mph); when surfaced, they could travel 780–910 nautical miles (1,440–1,690 km; 900–1,050 mi) at 5 knots (9.3 km/h; 5.8 mph). They were fitted with six 100 centimetres (39 in) mine tubes, twelve UC 120 mines, and one 8 millimetres (0.31 in) machine gun. They were built by AG Vulcan Stettin or AG Weser Bremen and their complement was fourteen crew members.^[1]

A total of 15 Type UC I submarines were built.

• SM UC-1, struck mine off Nieuport, 19 July 1917
• SM UC-2, rammed and sunk by coaster Cottingham off Great Yarmouth, 2 July 1915
• SM UC-3, struck mine off Zeebrugge, 27 May 1916
• SM UC-4, destroyed at Zeebrugge, 5 October 1918
• SM UC-5, wrecked in Thames Estuary 27 April 1916
• SM UC-6, sunk by British seaplanes, Thames Estuary, 27 September 1917
• SM UC-7, departed Zeebrugge, 3 July 1916, and did not return. Believed to have struck a mine
• SM UC-8, grounded on Dutch coast, 14 November 1915. Interned by Netherlands and served in Dutch Navy as the HLNMS M-1 until broken up in 1932^[2]
• SM UC-9, sunk by detonation of its own mines, North Sea, 21 October 1915
• SM UC-10, sunk by British submarine E54 21 August 1916, off Dutch coast
• SM UC-11, struck mine in English Channel, 16 June 1918
• SM UC-12, sunk by detonation of its own mines, 16 March 1916 near Taranto; salvaged and repaired by Italy as X1 (scrapped 1919)
• SM UC-13, ran aground and scuttled, Turkish coast, 29 November 1915
• SM UC-14, struck mine off Zeebrugge, 3 October 1917
• SM UC-15, failed to return from Black Sea patrol, November 1916

• Gröner, Erich; Jung, Dieter; Maass, Martin (1991). German Warships 1815–1945, U-boats and Mine Warfare Vessels. Vol. 2. Translated by Thomas, Keith; Magowan, Rachel. London: Conway Maritime Press. ISBN 0-85177-593-4.
• Fontenoy, Paul E. (2007). Submarines: An Illustrated History of Their Impact. ABC-CLIO. pp. 100–101. ISBN 978-1-85109-563-6.
• Messimer, Dwight R. (2002). Verschollen : World War I U-boat losses. Annapolis, Maryland: Naval Institute Press. ISBN 978-1-55750-475-3. OCLC 231973419.

• Rössler, Eberhard (2001). The U-boat: The evolution and technical history of German submarines. London: Cassell & Co. ISBN 0-304-36120-8.