SM UB-75

For other ships with the same name, see German submarine U-75.

SM UB-75 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 11 September 1917 as SM UB-75.^{[Note 1]}

UB-148 at sea, a U-boat similar to UB-75.
History
German Empire
Name	UB-75
Ordered	23 September 1916[1]
Builder	Blohm & Voss, Hamburg
Cost	3,338,000 German Papiermark
Yard number	304
Launched	5 May 1917[2]
Commissioned	11 September 1917[2]
Fate	Struck mine 10 December 1917 at 54°5′N 0°10′E, all hands lost.[2]
General characteristics [2]
Class & 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[2]
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 24 October – 10 December 1917
Commanders:	Oblt.z.S. Franz Walther[3] 11 September – 10 December 1917
Operations:	2 patrols
Victories:	6 merchant ships sunk (10,777 GRT) 1 merchant ship damaged (1,477 GRT)

UB-75 was serving in the Flanders Flotillas. On 10 December 1917 she was lost with all hands after hitting a mine.^[2]

Construction

Main article: Type UB III submarine

She was built by AG Vulcan of Hamburg and following just under a year of construction, launched at Hamburg on 5 May 1917. UB-75 was commissioned later that same year . Like all Type UB III submarines, UB-75 carried 10 torpedoes and was armed with a 8.8 cm (3.46 in) deck gun. UB-75 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-75 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[4]
4 November 1917	Lucida	United Kingdom	1,477	Damaged
9 November 1917	Frithjof Eide	Norway	1,207	Sunk
5 December 1917	Aigburth	United Kingdom	824	Sunk
6 December 1917	Leda	Netherlands	1,140	Sunk
7 December 1917	Highgate	United Kingdom	1,780	Sunk
8 December 1917	Lampada	United Kingdom	2,230	Sunk
9 December 1917	Venetia	United Kingdom	3,596	Sunk