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	UB-148 at sea, a U-boat similar to UB-111.
History
German Empire
Name	UB-111
Ordered	6 / 8 February 1917
Builder	Blohm & Voss, Hamburg
Cost	3,714,000 German Papiermark
Yard number	317
Launched	1 September 1917
Commissioned	5 April 1918
Fate	Surrendered 21 November 1918, broken up
General characteristics
Class and type	Type UB III submarine
Displacement	519 t (511 long tons) surfaced; 649 t (639 long tons) submerged;
Length	55.30 m (181 ft 5 in) (o/a)
Beam	5.80 m (19 ft)
Draught	3.70 m (12 ft 2 in)
Propulsion	2 × propeller shaft; 2 × MAN-Vulcan four-stroke 6-cylinder diesel engines, 1,085 bhp (809 kW); 2 × Maffei electric motors, 780 shp (580 kW);
Speed	13.3 knots (24.6 km/h; 15.3 mph) surfaced; 7.5 knots (13.9 km/h; 8.6 mph) submerged;
Range	7,420 nmi (13,740 km; 8,540 mi) at 6 knots (11 km/h; 6.9 mph) surfaced; 55 nmi (102 km; 63 mi) at 4 knots (7.4 km/h; 4.6 mph) submerged;
Test depth	50 m (160 ft)
Complement	3 officers, 31 men
Armament	5 × 50 cm (19.7 in) torpedo tubes (4 bow, 1 stern); 10 torpedoes; 1 × 8.8 cm (3.46 in) deck gun;
Service record
Part of:	Flandern II Flotilla; 27 July – 14 October 1918; II Flotilla; 14 October – 11 November 1918;
Commanders:	Oblt.z.S. / Kptlt. Egon von Werner; 5 April – 11 November 1918;
Operations:	3 patrols
Victories:	7 merchant ships sunk ; (694 GRT)

SM UB-111 was a German Type UB III submarine or U-boat in the German Imperial Navy (German: Kaiserliche Marine) during World War I. She was commissioned into the German Imperial Navy on 5 April 1918 as SM UB-111.^{[Note 1]}

UB-111 was surrendered to Britain on 21 November 1918 in accordance with the requirements of the Armistice with Germany and broken up in Bo'ness in 1919-20.^[2]

Construction

She was built by Blohm & Voss of Hamburg and following just under a year of construction, launched at Hamburg on 1 September 1917. UB-111 was commissioned in the spring the next year under the command of Kptlt. Egon von Werner. Like all Type UB III submarines, UB-111 carried 10 torpedoes and was armed with a 8.8 cm (3.46 in) deck gun. UB-111 would carry a crew of up to 3 officer and 31 men and had a cruising range of 7,420 nautical miles (13,740 km; 8,540 mi). UB-111 had a displacement of 519 t (511 long tons) while surfaced and 649 t (639 long tons) when submerged. Her engines enabled her to travel at 13.3 knots (24.6 km/h; 15.3 mph) when surfaced and 7.4 knots (13.7 km/h; 8.5 mph) when submerged.

Summary of raiding history

Date	Name	Nationality	Tonnage^{[Note 2]}	Fate^[4]
24 August 1918	Hollandia	Netherlands	103	Sunk
24 August 1918	Majoor Thomson	Netherlands	113	Sunk
24 August 1918	Maria Johanna	Netherlands	126	Sunk
24 August 1918	Neerlandia II	Netherlands	100	Sunk
24 August 1918	Neerlandia III	Netherlands	117	Sunk
24 August 1918	Secunda	Netherlands	30	Sunk
24 August 1918	Stella	Netherlands	105	Sunk

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.
^ Tonnages are in gross register tons

Citations

^ Rössler 1979, p. 66.
^ ^a ^b ^c ^d ^e ^f Gröner 1991, pp. 25–30.
^ Helgason, Guðmundur. "WWI U-boat commanders: Egon von Werner (Royal House Order of Hohenzollern)". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 9 March 2015.
^ Helgason, Guðmundur. "Ships hit by UB 111". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 9 March 2015.

Bibliography

Bendert, Harald (2000). Die UB-Boote der Kaiserlichen Marine, 1914-1918. Einsätze, Erfolge, Schicksal (in German). Hamburg: Verlag E.S. Mittler & Sohn GmbH. ISBN 3-8132-0713-7.
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.
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 (in German). Vol. I. Munich: Bernard & Graefe. ISBN 3-7637-5213-7.