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History
German Empire
Name	UC-100
Ordered	12 January 1916
Builder	Blohm & Voss, Hamburg
Yard number	334
Launched	14 April 1918
Commissioned	30 September 1918
Fate	Surrendered, 22 November 1918; broken up, July 1921
General characteristics
Class and type	Type UC III submarine
Displacement	491 t (483 long tons), surfaced; 571 t (562 long tons), submerged;
Length	56.51 m (185 ft 5 in) (o/a); 42.20 m (138 ft 5 in) (pressure hull);
Beam	5.54 m (18 ft 2 in) (o/a)
Draft	3.77 m (12 ft 4 in)
Propulsion	2 × propeller shafts; 2 × 6-cylinder, 4-stroke diesel engines, 600 PS (440 kW; 590 bhp); 2 × electric motors, 770 PS (570 kW; 760 shp);
Speed	11.5 knots (21.3 km/h; 13.2 mph), surfaced; 6.6 knots (12.2 km/h; 7.6 mph), submerged;
Range	9,850 nautical miles (18,240 km; 11,340 mi) at 7 knots (13 km/h; 8.1 mph), surfaced; 40 nmi (74 km; 46 mi) at 4.5 knots (8.3 km/h; 5.2 mph), submerged;
Test depth	75 m (246 ft)
Complement	32
Armament	6 × 100 cm (39.4 in) mine tubes; 14 × UC 200 mines; 3 × 50 cm (19.7 in) torpedo tubes (2 bow external; one stern); 7 × torpedoes; 1 x 10.5 cm (4.1 in) SK L/45 or 8.8 cm (3.5 in) Uk L/30 deck gun;
Notes	15-second diving time
Service record
Commanders:	Oblt. Siegfried Vahl; 1 October – 11 November 1918;
Operations:	None
Victories:	None

SM UC-100 was a German Type UC III minelaying submarine or U-boat in the German Imperial Navy (German: Kaiserliche Marine) during World War I.

Design

A Type UC III submarine, UC-100 had a displacement of 491 tonnes (483 long tons) when at the surface and 571 tonnes (562 long tons) while submerged. She had a length overall of 56.51 m (185 ft 5 in), a beam of 5.54 m (18 ft 2 in), and a draught of 3.77 m (12 ft 4 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 770 metric horsepower (570 kW; 760 shp), and two propeller shafts. She had a dive time of 15 seconds and was capable of operating at a depth of 75 metres (246 ft).^[4]

The submarine was designed for a maximum surface speed of 11.5 knots (21.3 km/h; 13.2 mph) and a submerged speed of 6.6 knots (12.2 km/h; 7.6 mph). When submerged, she could operate for 40 nautical miles (74 km; 46 mi) at 4.5 knots (8.3 km/h; 5.2 mph); when surfaced, she could travel 9,850 nautical miles (18,240 km; 11,340 mi) at 7 knots (13 km/h; 8.1 mph). UC-100 was fitted with six 100 centimetres (39 in) mine tubes, fourteen UC 200 mines, three 50 centimetres (20 in) torpedo tubes (one on the stern and two on the bow), seven torpedoes, and one 10.5 cm (4.1 in) SK L/45 or 8.8 cm (3.5 in) Uk L/30 deck gun . Her complement was twenty-six crew members.^[4]

Construction and career

The U-boat was ordered on January 12, 1916 and was launched on April 14, 1918. She was commissioned into the German Imperial Navy on September 30, 1918 as SM UC-100.^{[Note 1]} As with the rest of the completed UC III boats, UC-100 conducted no war patrols and sank no ships. She was surrendered to France on November 22, 1918 and was broken up in Cherbourg in July 1921.^[1]

References

Notes

^ "SM" stands for "Seiner Majestät" (English: His Majesty's) and combined with the U for Unterseeboot would be translated as His Majesty's Submarine.

Citations

^ ^a ^b ^c ^d ^e ^f Helgason, Guðmundur. "WWI U-boats: UC 100". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net.
^ Tarrant, p. 174.
^ Helgason, Guðmundur. "WWI U-boat commanders: Siegfried Vahl". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 20 January 2015.
^ ^a ^b Gröner 1991, pp. 34–35.

Bibliography

Bendert, Harald (2001). Die UC-Boote der Kaiserlichen Marine 1914-1918. Minenkrieg mit U-Booten (in German). Hamburg, Berlin, Bonn: Mittler. ISBN 3-8132-0758-7.
Gröner, Erich; Jung, Dieter; Maass, Martin (1991). U-boats and Mine Warfare Vessels. German Warships 1815–1945. Vol. 2. Translated by Thomas, Keith; Magowan, Rachel. London: Conway Maritime Press. ISBN 0-85177-593-4.
Gardiner, Robert; Gray, Randal, eds. (1985). Conway's All the World's Fighting Ships 1906–1921. Annapolis, Maryland: Naval Institute Press. ISBN 978-0-87021-907-8. OCLC 12119866.
Tarrant, V. E. (1989). The U-Boat Offensive: 1914–1945. Annapolis, Maryland: Naval Institute Press. ISBN 978-0-87021-764-7. OCLC 20338385.