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(Top) 1 Construction 2 Summary of raiding history 3 References 3.1 Notes 3.2 Citations 4 Bibliography 5 External links

SMUB-78

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History
UB-148 at sea, a U-boat similar to UB-78.
German Empire
Name	UB-78
Ordered	23 September 1916^[2]
Builder	Blohm & Voss, Hamburg
Cost	3,338,000 German Papiermark
Yard number	307
Launched	2 June 1917^[1]
Commissioned	20 October 1917^[1]
Fate	Mined off Dover in position 51°01′N 01°17′E / 51.017°N 1.283°E / 51.017; 1.283 on 19 April 1918 all 35 crew lost.^[3]
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^[1]
Armament	5 × 50 cm (19.7 in) torpedo tubes (4 bow, 1 stern) 10torpedoes 1 × 8.8 cm (3.46 in) deck gun
Service record
Part of:	V Flotilla 2 January – 18 February 1918 Flandern I Flotilla 18 February – 19 April 1918
Commanders:	Kptlt. Woldemar Petri^[4] 20 October 1917 – 15 February 1918 Oblt.z.S. Ulrich Pilzecker^[5] 16 February – 17 March 1918 Oblt.z.S. Arthur Stoßberg^[6] 18 March – 19 April 1918
Operations:	5 patrols
Victories:	1 merchant ship sunk (1,155 GRT) 1 auxiliary warship sunk (86 GRT) 2 merchant ships damaged (7,040 GRT)

SMUB-78 was a German Type UB III submarineorU-boat in the German Imperial Navy (German: Kaiserliche Marine) during World War I. She was commissioned into the German Imperial Navy on 20 October 1917 as SM UB-78.^{[Note 1]} Mined off Dover on 19 April 1918 all 35 crew lost.^[3]

Construction[edit]

She was built by Blohm & VossofHamburg and following just under a year of construction, launched at Hamburg on 2 June 1917. UB-78 was commissioned later that same year under the command of Kptlt. Woldemar Petri. Like all Type UB III submarines, UB-78 carried 10 torpedoes and was armed with a 8.8 cm (3.46 in) deck gun. UB-78 would carry a crew of up to 3 officers and 31 men and had a cruising range of 8,680 nautical miles (16,080 km; 9,990 mi). UB-78 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.^[1]

Summary of raiding history[edit]

Date	Name	Nationality	Tonnage^{[Note 2]}	Fate^[7]
21 March 1918	Strathearn	United Kingdom	152	Damaged
22 March 1918	Polleon	United Kingdom	1,155	Sunk
25 March 1918	HMD Border Lads	Royal Navy	86	Sunk
26 March 1918	British Star	United Kingdom	6,888	Damaged

References[edit]

Notes[edit]

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

^ Merchant ship tonnages are in gross register tons. Military vessels are listed by tons displacement.

Citations[edit]

^ ^a ^b ^c ^d Gröner 1991, pp. 25–30.

^ Rössler 1979, p. 65.

^ ^a ^b Helgason 2018

^ Helgason, Guðmundur. "WWI U-boat commanders: Woldemar Petri". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 8 March 2015.

^ Helgason, Guðmundur. "WWI U-boat commanders: Ulrich Pilzecker". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 8 March 2015.

^ Helgason, Guðmundur. "WWI U-boat commanders: Arthur Stoßberg". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 8 March 2015.

^ Helgason, Guðmundur. "Ships hit by UB 78". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 8 March 2015.

Bibliography[edit]

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.

Helgason, Guðmundur (2018). "UB 78". uboat.net. Retrieved 18 April 2018.

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.