SM UB-90

	UB-148 at sea, a U-boat similar to UB-90.
History
German Empire
Name	UB-90
Ordered	6 / 8 February 1917
Builder	AG Vulcan, Hamburg
Cost	3,654,000 German Papiermark
Yard number	106
Launched	12 February 1918
Commissioned	21 March 1918
Fate	Sunk 16 October 1918 by British submarine
General characteristics
Class and type	Type UB III submarine
Displacement	510 t (500 long tons) surfaced; 640 t (630 long tons) submerged;
Length	55.52 m (182 ft 2 in) (o/a)
Beam	5.76 m (18 ft 11 in)
Draught	3.73 m (12 ft 3 in)
Propulsion	2 × propeller shaft; 2 × MAN-Vulcan four-stroke 6-cylinder diesel engines, 1,085 bhp (809 kW); 2 × Siemens-Schuckert electric motors, 780 shp (580 kW);
Speed	13 knots (24 km/h; 15 mph) surfaced; 7.4 knots (13.7 km/h; 8.5 mph) submerged;
Range	7,120 nmi (13,190 km; 8,190 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 × 10.5 cm (4.13 in) deck gun;
Service record
Part of:	II Flotilla; 29 June – 16 October 1918;
Commanders:	Oblt.z.S. Gottfried von Mayer; 21 March – 16 October 1918;
Operations:	2 patrols
Victories:	1 merchant ship sunk ; (3,575 GRT); 1 merchant ship taken as prize ; (850 GRT);

SM UB-90 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 21 March 1918 as SM UB-90.^{[Note 1]}

On 16 October 1918, UB-90 was hit by a torpedo from HMS L12 at 57°55′N 10°27′E / 57.917°N 10.450°E / 57.917; 10.450 and sunk. All 38 crew members died in the event.^[2]

Construction

She was built by AG Vulcan of Hamburg and following just under a year of construction, launched at Hamburg on 12 February 1918. UB-90 was commissioned early the next year under the command of Oblt.z.S. Gottfried von Mayer. Like all Type UB III submarines, UB-90 carried 10 torpedoes and was armed with a 10.5 cm (4.13 in) deck gun. UB-90 would carry a crew of up to 3 officer and 31 men and had a cruising range of 7,120 nautical miles (13,190 km; 8,190 mi). UB-90 had a displacement of 510 t (500 long tons) while surfaced and 640 t (630 long tons) when submerged. Her engines enabled her to travel at 13 knots (24 km/h; 15 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]
29 July 1918	Douro	Denmark	850	Captured as prize
3 October 1918	Eupion	United Kingdom	3,575	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. 61.
^ ^a ^b ^c ^d ^e ^f Gröner 1991, pp. 25–30.
^ Helgason, Guðmundur. "WWI U-boat commanders: Gottfried von Mayer". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 8 February 2015.
^ Helgason, Guðmundur. "Ships hit by UB 90". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 8 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 978-3-8132-0713-2.
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 978-0-85177-593-7.
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.

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

[tonnage-5] Tonnages are in gross register tons

[FOOTNOTERössler197961-1] Rössler 1979, p. 61.

[FOOTNOTEGröner199125–30-2] ^ ^a ^b ^c ^d ^e ^f Gröner 1991, pp. 25–30.

[3] Helgason, Guðmundur. "WWI U-boat commanders: Gottfried von Mayer". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 8 February 2015.

[6] Helgason, Guðmundur. "Ships hit by UB 90". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 8 February 2015.

[1]

[2]

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[Note 1]

[Note 2]

[4]

v t Type UB III submarines
SM UB-48 SM UB-49 SM UB-50 SM UB-51 SM UB-52 SM UB-53 SM UB-54 SM UB-55 SM UB-56 SM UB-57 SM UB-58 SM UB-59 SM UB-60 SM UB-61 SM UB-62 SM UB-63 SM UB-64 SM UB-65 SM UB-66 SM UB-67 SM UB-68 SM UB-69 SM UB-70 SM UB-71 SM UB-72 SM UB-73 SM UB-74 SM UB-75 SM UB-76 SM UB-77 SM UB-78 SM UB-79 SM UB-80 SM UB-81 SM UB-82 SM UB-83 SM UB-84 SM UB-85 SM UB-86 SM UB-87 SM UB-88 SM UB-89 SM UB-90 SM UB-91 SM UB-92 SM UB-93 SM UB-94 SM UB-95 SM UB-96 SM UB-97 SM UB-98 SM UB-99 SM UB-100 SM UB-101 SM UB-102 SM UB-103 SM UB-104 SM UB-105 SM UB-106 SM UB-107 SM UB-108 SM UB-109 SM UB-110 SM UB-111 SM UB-112 SM UB-113 SM UB-114 SM UB-115 SM UB-116 SM UB-117 SM UB-118 SM UB-119 SM UB-120 SM UB-121 SM UB-122 SM UB-123 SM UB-124 SM UB-125 SM UB-126 SM UB-127 SM UB-128 SM UB-129 SM UB-130 SM UB-131 SM UB-132 SM UB-133 SM UB-136 SM UB-142 SM UB-143 SM UB-144 SM UB-145 SM UB-148 SM UB-149 SM UB-150 SM UB-154 SM UB-155
Preceded by: Type UB II Followed by: Type VII (World War II)
List of U-boats of Germany

v t Shipwrecks and maritime incidents in October 1918
Shipwrecks	2 Oct: Keltier 3 Oct: Burutu, SMS G41 4 Oct: HMS L10, SM UB-68, Oceania 5 Oct: USS Mary Alice, SM UB-10, SM UB-40, SM UB-59, SM UC-4 6 Oct: HMS C12, HMS Otranto 7 Oct: USS West Gate 10 Oct: Leinster, Senator Schröder 15 Oct: HMS J6 16 Oct: Dumaru, SM UB-90 19 Oct: HMS Plumpton, SM UB-123 20 Oct: HMS M21 21 Oct: USS Cero, SM UB-89 23 Oct: HMS D1 25 Oct: Princess Sophia 27 Oct: SM U-78 28 Oct: USS Tarantula, SM U-47, SM U-65, SM UB-48, SM UB-116, SM UC-25, SM UC-53, SM UC-54 30 Oct: HMCS Galiano, SM U-73, SM UC-34 31 Oct: SM UB-129 Unknown date: SMS Brugge, HMS G7, SM U-34
Other incidents	2 Oct: Aquitania, USS Shaw 3 Oct: USS George G. Henry 5 Oct: USS O-13 6 Oct: HMS Kashmir 7 Oct: USS American 12 Oct: USAT Amphion 15 Oct: HMS Cymric 18 Oct: Voltaire 20 Oct: USS Berwyn 21 Oct: SMS Frankfurt
1917 1918 1919 September 1918 November 1918