SM UB-103

	UB-148 at sea, a U-boat similar to UB-103.
History
German Empire
Name	UB-103
Ordered	6 / 8 February 1917
Builder	Blohm & Voss, Hamburg
Cost	3,714,000 German Papiermark
Yard number	309
Launched	7 July 1917
Commissioned	18 December 1917
Fate	Sunk 14 August 1918 at 50°52′N1°27′E / 50.867°N 1.450°E
General characteristics
Class and type	German Type UB III submarine
Displacement	510 t (500 long tons) surfaced; 629 t (619 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 × Siemens-Schuckert 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 I Flotilla ; 8 March – 14 August 1918;
Commanders:	Kptlt. Paul Hundius; 18 December 1917 – 14 August 1918;
Operations:	6 patrols
Victories:	15 merchant ships sunk ; (25,999 GRT)

Last updated January 24, 2024

SM UB-103 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 on 18 December 1917 as SM UB-103.^{[Note 1]}

Construction

She was built by Blohm & Voss of Hamburg and, after just under a year of construction, launched at Hamburg on 7 July 1917. UB-103 was commissioned later the same year, under the command of KptLt Paul Hundius. Like all Type UB III submarines, UB-103 carried 10 torpedoes and was armed with a 8.8 cm (3.46 in) deck gun. UB-103 had a crew of up to three officers and 31 men, and its cruising range was 7,420 nautical miles (13,740 km; 8,540 mi). UB-103 had a displacement of 510 t (500 long tons) while surfaced and 629 t (619 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^[5]
20 March 1918	Eros	Sweden	858	Sunk
21 March 1918	Tyrhaug	United Kingdom	1,483	Sunk
24 March 1918	Anteros	United Kingdom	4,241	Sunk
22 April 1918	Eric Calvert	United Kingdom	1,862	Sunk
28 April 1918	Elba	United Kingdom	1,081	Sunk
2 May 1918	Thorsa	United Kingdom	1,319	Sunk
3 May 1918	Vasilefs Georgios	Greece	3,651	Sunk
10 June 1918	Borg	United Kingdom	2,111	Sunk
11 June 1918	Lorle	United Kingdom	2,686	Sunk
12 June 1918	Kul	United Kingdom	1,095	Sunk
11 July 1918	Kong Guttorm	Norway	731	Sunk
15 July 1918	Cap Breton	France	1,464	Sunk
15 July 1918	Vendee	France	892	Sunk
16 July 1918	Lyndiane	France	1,564	Sunk
21 July 1918	Arvor	France	961	Sunk

Related Research Articles

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SM UB-116 was a German Type UB III submarine or U-boat in the German Imperial Navy during World War I. She was commissioned into the German Imperial Navy on 24 May 1918 as SM UB-116.

SM UB-125 was a German Type UB III submarine or U-boat in the German Imperial Navy during World War I. She was commissioned into the German Imperial Navy on 18 May 1918 as SM UB-125.

SM UB-126 was a German Type UB III submarine or U-boat in the German Imperial Navy during World War I. She was commissioned into the German Imperial Navy on 20 April 1918 as SM UB-126.

SM UB-142 was a German Type UB III submarine or U-boat in the German Imperial Navy during World War I. She was commissioned into the German Imperial Navy on 31 August 1918 as SM UB-142.

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.
1 2 3 4 5 Gröner 1991, pp. 25–30.
↑ Helgason, Guðmundur. "WWI U-boat commanders: Paul Hundius (Pour le Mérite)". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 9 March 2015.
↑ "WWI U-boats UB 103". uboat.net. Guðmundur Helgason. Retrieved 16 June 2021.
↑ Helgason, Guðmundur. "Ships hit by UB 103". 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). 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.

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[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-6] Tonnages are in gross register tons

[FOOTNOTERössler197966-1] Rössler 1979, p. 66.

[FOOTNOTEGröner199125–30-2] 1 2 3 4 5 Gröner 1991, pp. 25–30.

[3] Helgason, Guðmundur. "WWI U-boat commanders: Paul Hundius (Pour le Mérite)". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 9 March 2015.

[5] "WWI U-boats UB 103". uboat.net. Guðmundur Helgason. Retrieved 16 June 2021.

[7] Helgason, Guðmundur. "Ships hit by UB 103". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 9 March 2015.

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[Note 1]

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[Note 2]

[5]

v t e German 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

History
UB-148 at sea, a U-boat similar to UB-103.
German Empire
Name	UB-103
Ordered	6 / 8 February 1917^[1]
Builder	Blohm & Voss, Hamburg
Cost	3,714,000 German Papiermark
Yard number	309
Launched	7 July 1917^[2]
Commissioned	18 December 1917^[2]
Fate	Sunk 14 August 1918 at 50°52′N1°27′E / 50.867°N 1.450°E / 50.867; 1.450 ^[2]
General characteristics ^[2]
Class and type	German Type UB III submarine
Displacement	510 t (500 long tons) surfaced 629 t (619 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 × Siemens-Schuckert 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 I Flotilla 8 March – 14 August 1918
Commanders:	Kptlt. Paul Hundius^[3] 18 December 1917 – 14 August 1918
Operations:	6 patrols
Victories:	15 merchant ships sunk (25,999 GRT)