# SM UB-103

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WWI era German Navy U-boat

For other ships with the same name, see [German submarine U-103](/source/German_submarine_U-103).

UB-148 at sea, a U-boat similar to UB-103. History 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[2] General characteristics [2] Class & type 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)

**SM *UB-103*** was a German [Type UB III submarine](/source/Type_UB_III_submarine) or [U-boat](/source/U-boat) in the [German Imperial Navy](/source/German_Imperial_Navy) ([German](/source/German_language): *Kaiserliche Marine*) during [World War I](/source/World_War_I). She was [commissioned](/source/Ship_commissioning) on 18 December 1917 as SM *UB-103*.[Note 1]

*UB-103* was sunk in the English Channel at [50°52′N 1°27′E / 50.867°N 1.450°E / 50.867; 1.450](https://geohack.toolforge.org/geohack.php?pagename=SM_UB-103&params=50_52_N_1_27_E_) by British warships and *SSZ 1*, a [SSZ class airship](/source/SSZ_class_airship).[2] All hands were lost.[4]

## Construction

Main article: [Type UB III submarine](/source/Type_UB_III_submarine)

She was built by [Blohm & Voss](/source/Blohm_%26_Voss) of [Hamburg](/source/Hamburg) and, after just under a year of construction, [launched](/source/Ceremonial_ship_launching) at Hamburg on 7 July 1917. *UB-103* was commissioned later the same year, under the command of *[KptLt](/source/Kapit%C3%A4nleutnant)* Paul Hundius. Like all Type UB III submarines, *UB-103* carried 10 [torpedoes](/source/Torpedo) and was armed with a [8.8 cm (3.46 in) deck gun](/source/8.8_cm_SK_L%2F30_naval_gun). *UB-103* had a crew of up to three officers and 31 men, and its cruising range was 7,420 [nautical miles](/source/Nautical_mile) (13,740 km; 8,540 mi). *UB-103* had a displacement of 510 [t](/source/Tonne) (500 long tons) while surfaced and 629 t (619 long tons) when submerged. Her engines enabled her to travel at 13.3 [knots](/source/Knot_(unit)) (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

## References

### Notes

1. **[^](#cite_ref-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*.

1. **[^](#cite_ref-tonnage_6-0)** Tonnages are in [gross register tons](/source/Gross_register_tons)

### Citations

1. **[^](#cite_ref-FOOTNOTERössler197966_1-0)** [Rössler 1979](#CITEREFRössler1979), p. 66.

1. ^ [***a***](#cite_ref-FOOTNOTEGröner199125–30_2-0) [***b***](#cite_ref-FOOTNOTEGröner199125–30_2-1) [***c***](#cite_ref-FOOTNOTEGröner199125–30_2-2) [***d***](#cite_ref-FOOTNOTEGröner199125–30_2-3) [***e***](#cite_ref-FOOTNOTEGröner199125–30_2-4) [Gröner 1991](#CITEREFGröner1991), pp. 25–30.

1. **[^](#cite_ref-3)** Helgason, Guðmundur. ["WWI U-boat commanders: Paul Hundius (Pour le Mérite)"](https://uboat.net/wwi/men/commanders/132.html). *German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net*. Retrieved 9 March 2015.

1. **[^](#cite_ref-5)** ["WWI U-boats UB 103"](https://uboat.net/wwi/boats/?boat=UB%20103). *uboat.net*. Guðmundur Helgason. Retrieved 16 June 2021.

1. **[^](#cite_ref-7)** Helgason, Guðmundur. ["Ships hit by UB 103"](https://uboat.net/wwi/boats/successes/ub103.html). *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](/source/Hamburg): [Verlag E.S. Mittler & Sohn GmbH](/source/Verlag_E.S._Mittler_%26_Sohn_GmbH). [ISBN](/source/ISBN_(identifier)) [3-8132-0713-7](https://en.wikipedia.org/wiki/Special:BookSources/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](/source/ISBN_(identifier)) [0-85177-593-4](https://en.wikipedia.org/wiki/Special:BookSources/0-85177-593-4).

- Rössler, Eberhard (1979). [*Die deutschen U-Boote und ihre Werften: eine Bilddokumentation über den deutschen U-Bootbau; in zwei Bänden*](https://books.google.com/books?id=QIvfAAAAMAAJ) (in German). Vol. I. [Munich](/source/Munich): [Bernard & Graefe](/source/Bernard_%26_Graefe). [ISBN](/source/ISBN_(identifier)) [3-7637-5213-7](https://en.wikipedia.org/wiki/Special:BookSources/3-7637-5213-7).

v t e 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

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Adapted from the Wikipedia article [SM UB-103](https://en.wikipedia.org/wiki/SM_UB-103) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/SM_UB-103?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.