SM UB-20

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For other ships of the same name, see German submarine U-20.

Career (German Empire)
SM UB-45 a u-boat similar to UB-20
Name:	UB-20
Ordered:	30 April 1915^[1]
Builder:	Blohm & Voss, Hamburg^[1]
Yard number:	250^[1]
Launched:	26 September 1915^[1]
Completed:	8 February 1916^[1]
Commissioned:	10 February 1916^[2]
Fate:	sunk by mine, 28 July 1917^[2]
General characteristics
Class & type:	German Type UB II submarine
Displacement:	263 t (259 long tons) surfaced^[2] 292 t (287 long tons) submerged^[2]
Length:	36.13 m (118 ft 6 in)^[2]
Beam:	436 m (1,430 ft 5 in)^[2]
Draft:	3.7 m (12 ft 2 in)^[2]
Propulsion:	2 × propeller shafts 2 × Körting diesel engines, 284 shp (212 kW)^[2] 2 × Siemens-Schuckert electric motor, 280 shp (210 kW)^[2]
Speed:	9.15 knots (16.95 km/h) surfaced^[2] 5.81 knots (10.76 km/h) submerged^[2]
Range:	6,450 nautical miles (11,950 km; 7,420 mi) at 5 knots (9.3 km/h; 5.8 mph) surfaced^[2] 45 nmi (83 km; 52 mi) at 4 knots submerged^[2]
Test depth:	50 m (160 ft)^[2]
Complement:	2 officers, 21 men^[2]
Armament:	2 × 50 cm (19.7 in) torpedo tubes^[2] 4 × torpedoes (later 6) 1 × 5 cm SK L/40 gun^[2]
Notes:	45-second diving time^[2]

SM UB-20 was a German Type UB II submarine or U-boat in the German Imperial Navy (German: Kaiserliche Marine) during World War I. The U-boat was ordered on 30 April 1915 and launched on 26 September 1915. She was commissioned into the German Imperial Navy on 10 February 1916 as SM UB-20.^{[Note 1]} The submarine sank 13 ships in 15 patrols for a total of 10,230 gross register tons (GRT).^[3] UB-20 was mined and sunk on 28 July 1917 at 51°25′N 3°20′W / 51.417°N 3.333°W / 51.417; -3.333Coordinates: 51°25′N 3°20′W / 51.417°N 3.333°W / 51.417; -3.333. Thirteen crew members died in the event.^[2]

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.

↑ 1.0 1.1 1.2 1.3 1.4 Rössler 1979, p. 64.
↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 2.10 2.11 2.12 2.13 2.14 2.15 2.16 2.17 2.18 Gröner 1985, p. 50.
↑ Bendert 2000, p. 195.

Gröner, Erich (1985). "U-Boote, Hilfskreuzer, Minenschiffe, Netzleger, Sperrbrecher". Die deutschen Kriegsschiffe, 1815-1945 III (Koblenz: Bernhard&Graefe). ISBN 3-7637-4802-4.
Bendert, Harald (2000). Die UB-Boote der Kaiserlichen Marine, 1914-1918. Einsätze, Erfolge, Schicksal. Hamburg: Verlag E.S. Mittler & Sohn GmbH. ISBN 3-8132-0713-7.
Rössler, Eberhard (1979). "U-Bootbau bis Ende des 1. Weltkrieges, Konstruktionen für das Ausland und die Jahre 1935 - 1945". Die deutschen U-Boote und ihre Werften I (Munich: Bernhard&Graefe). ISBN 3-7637-5213-7.

v t e German Type UB II submarines

UB-18 UB-19 UB-20 UB-21 UB-22 UB-23 UB-24 UB-25 UB-26 UB-27 UB-28 UB-29 UB-30 UB-31 UB-32 UB-33 UB-34 UB-35 UB-36 UB-37 UB-38 UB-39 UB-40 UB-41 UB-42 UB-43 UB-44 UB-45 UB-46 UB-47

Preceded by: Type UB I Followed by: Type UB III List of German U-boats

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