SM UB-77

	UB-148 at sea, a U-boat similar to UB-77.
History
German Empire
Name	UB-77
Ordered	23 September 1916
Builder	Blohm & Voss, Hamburg
Cost	3,338,000 German Papiermark
Yard number	306
Launched	5 May 1917
Commissioned	2 October 1917
Fate	Surrendered 16 January 1919.
General characteristics
Class and type	Type UB III submarine
Displacement	516 t (508 long tons) surfaced; 648 t (638 long tons) submerged;
Length	55.30 m (181 ft 5 in) (o/a)
Beam	5.80 m (19 ft)
Draught	3.68 m (12 ft 1 in)
Propulsion	2 × propeller shaft; 2 × MAN four-stroke 6-cylinder diesel engines, 1,085 bhp (809 kW); 2 × Siemens-Schuckert electric motors, 780 shp (580 kW);
Speed	13.6 knots (25.2 km/h; 15.7 mph) surfaced; 7.8 knots (14.4 km/h; 9.0 mph) submerged;
Range	8,680 nmi (16,080 km; 9,990 mi) at 8 knots (15 km/h; 9.2 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:	V Flotilla; 30 November 1917 – 17 April 1918; I Flotilla; 17 April – 11 November 1918;
Commanders:	Kptlt. Wilhelm Meyer; 2 October 1917 – 14 June 1918; Oblt.z.S. Franz Maurer; 15 June – 11 November 1918;
Operations:	7 patrols
Victories:	1 merchant ship sunk ; (14,348 GRT); 2 merchant ships damaged ; (28,174 GRT);

SM UB-77 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 2 October 1917 as SM UB-77.^{[Note 1]}

UB-77 was surrendered on 16 January 1919 in accordance with the requirements of the Armistice with Germany and broken up in Swansea in 1921.^[1]

Construction

UB-77 was ordered by the GIN on 23 September 1916.

She was built by Blohm & Voss of Hamburg and following just under a year of construction, launched at Hamburg on 5 May 1917. UB-77 was commissioned later that same year under the command of Kptlt. Wilhelm Meyer. Like all Type UB III submarines, UB-77 carried 10 torpedoes and was armed with a 8.8 cm (3.46 in) deck gun. UB-77 would carry a crew of up to 3 officer and 31 men and had a cruising range of 8,680 nautical miles (16,080 km; 9,990 mi). UB-77 had a displacement of 516 t (508 long tons) while surfaced and 648 t (638 long tons) when submerged. Her engines enabled her to travel at 13.6 knots (25.2 km/h; 15.7 mph) when surfaced and 7.8 knots (14.4 km/h; 9.0 mph) when submerged.

Summary of raiding history

Date	Name	Nationality	Tonnage^{[Note 2]}	Fate^[5]
5 February 1918	Tuscania	United Kingdom	14,348	Sunk
31 March 1918	Celtic	United Kingdom	20,904	Damaged
28 August 1918	Lompoc	United Kingdom	7,270	Damaged

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

^ ^a ^b ^c ^d ^e ^f Gröner 1991, pp. 25–30.
^ Rössler 1979, p. 65.
^ Helgason, Guðmundur. "WWI U-boat commanders: Wilhelm Meyer". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 4 February 2015.
^ Helgason, Guðmundur. "WWI U-boat commanders: Franz Maurer". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 4 February 2015.
^ Helgason, Guðmundur. "Ships hit by UB 77". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 4 February 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). Die deutschen U-Boote und ihre Werften: eine Bilddokumentation über den deutschen U-Bootbau; in zwei Bänden (in German). Vol. I. Munich: Bernard & Graefe. ISBN 3-7637-5213-7.