{{Short description|WWI era German Navy U-boat}} {{Other ships|German submarine U-103}} {{Use dmy dates|date=May 2026}} {{Infobox ship |section1={{Infobox ship/image |image=UB 148 at sea 2.jpeg |image_caption=''UB-148'' at sea, a U-boat similar to ''UB-103''. }}
|section2={{Infobox ship/career |country=[[German Empire]] |flag={{Shipboxflag|German Empire|naval}} |name=''UB-103'' |ordered=6 / 8 February 1917{{sfn|Rössler|1979|p=66}} |builder=[[Blohm & Voss]], [[Hamburg]] |original_cost=3,714,000 [[German Papiermark]] |yard_number=309 |laid_down= |launched=7 July 1917{{sfn|Gröner|1991|pp=25–30}} |completed= |commissioned=18 December 1917{{sfn|Gröner|1991|pp=25–30}} |fate=Sunk 14 August 1918{{sfn|Gröner|1991|pp=25–30}} }}
|section3={{Infobox ship/characteristics |hide_header= |header_caption={{sfn|Gröner|1991|pp=25–30}} |class=[[Type UB III submarine]] |displacement=*{{convert|510|t|LT|lk=on|abbr=on}} surfaced *{{convert|629|t|LT|abbr=on}} submerged |length= {{convert|55.30|m|ftin|abbr=on}} ([[o/a]]) |beam={{convert|5.80|m|ft|0|abbr=on}} |draught={{convert|3.70|m|ftin|abbr=on}} |propulsion=*2 × [[propeller shaft (ship)|propeller shaft]] *2 × [[MAN SE|MAN]]-[[AG Vulcan|Vulcan]] four-stroke 6-cylinder [[diesel engine]]s, {{convert|809|kW|bhp|abbr=on|order=flip|lk=in}} *2 × [[Siemens-Schuckert]] [[Motor-generator|electric motor]]s, {{convert|580|kW|shp|order=flip|abbr=on|lk=in}} |speed=*{{convert|13.3|kn|lk=in}} surfaced *{{convert|7.5|kn}} submerged |range=*{{convert|7,420|nmi|lk=in|abbr=on}} at {{convert|6|kn}} surfaced *{{convert|55|nmi|abbr=on}} at {{convert|4|kn}} submerged |test_depth={{convert|50|m|ft|abbr=on}} |complement=3 officers, 31 men |armament=*5 × {{convert|50|cm|in|1|abbr=on}} [[torpedo tube]]s (4 bow, 1 stern) *10 [[torpedo]]es *1 × [[8.8 cm SK L/30 naval gun|{{convert|8.8|cm|in|2|abbr=on}} deck gun]] |notes= }}
|section4={{Infobox ship/service record |partof=*[[Flanders Flotilla|Flandern I Flotilla]] *8 March – 14 August 1918 |commanders=*''Kptlt.'' Paul Hundius<ref>{{cite Uboat.net |id=132 |name=Paul Hundius (Pour le Mérite) |type=1comm |accessdate=9 March 2015}}</ref> *18 December 1917 – 14 August 1918 |operations=6 patrols |victories=*15 merchant ships sunk <br />({{GRT|25,999}}) }} }}
'''SM ''UB-103''''' was a German [[Type UB III submarine]] or [[U-boat]] in the [[German Imperial Navy]] ({{langx|de|Kaiserliche Marine}}) during [[World War I]]. She was [[Ship commissioning|commissioned]] on 18 December 1917 as SM ''UB-103''.{{#tag:ref|"SM" stands for "Seiner Majestät" ({{langx|en|His Majesty's}}) and combined with the ''U'' for ''Unterseeboot'' would be translated as ''His Majesty's Submarine''.|group=Note}}
''UB-103'' was sunk in the English Channel at {{coord|50|52|N|1|27|E|display=title, inline}} by British warships and ''SSZ 1'', a [[SSZ class airship]].{{sfn|Gröner|1991|pp=25–30}} All hands were lost.<ref>{{cite web |title=WWI U-boats UB 103 |url=https://uboat.net/wwi/boats/?boat=UB%20103 |website=uboat.net |publisher=Guðmundur Helgason |access-date=2021-06-16}}</ref>
==Construction== {{Main|Type UB III submarine}} She was built by [[Blohm & Voss]] of [[Hamburg]] and, after just under a year of construction, [[ceremonial ship launching|launched]] at Hamburg on 7 July 1917. ''UB-103'' was commissioned later the same year, under the command of ''[[Kapitänleutnant|KptLt]]'' Paul Hundius. Like all Type UB III submarines, ''UB-103'' carried 10 [[torpedo]]es and was armed with a [[8.8 cm SK L/30 naval gun|{{convert|8.8|cm|in|2|abbr=on}} deck gun]]. ''UB-103'' had a crew of up to three officers and 31 men, and its cruising range was {{convert|7,420|nmi|lk=in}}. ''UB-103'' had a displacement of {{convert|510|t|LT|lk=in|abbr=on}} while surfaced and {{convert|629|t|LT|abbr=on}} when submerged. Her engines enabled her to travel at {{convert|13.3|kn|lk=in}} when surfaced and {{convert|7.4|kn}} when submerged.
==Summary of raiding history== {| class="wikitable sortable" |- ! width="140px"|Date ! width="140px"|Name ! width="200px"|Nationality ! width="25px" |Tonnage<ref group=Note name=tonnage>Tonnages are in [[gross register tons]]</ref> ! width="160px"|Fate<ref>{{cite Uboat.net |id=ub103 |name=UB 103 |type=1boat |accessdate=9 March 2015 }}</ref> |- |align="right"|20 March 1918 |align="left" |[[List of shipwrecks in March 1918#20 March|''Eros'']] |align="left" |{{flag|Sweden}} |align="right"|858 |align="left" |Sunk |- |align="right"|21 March 1918 |align="left" |[[List of shipwrecks in March 1918#21 March|''Tyrhaug'']] |align="left" |{{flag|United Kingdom|civil}} |align="right"|1,483 |align="left" |Sunk |- |align="right"|24 March 1918 |align="left" |[[List of shipwrecks in March 1918#24 March|''Anteros'']] |align="left" |{{flag|United Kingdom|civil}} |align="right"|4,241 |align="left" |Sunk |- |align="right"|22 April 1918 |align="left" |[[List of shipwrecks in April 1918#22 April|''Eric Calvert'']] |align="left" |{{flag|United Kingdom|civil}} |align="right"|1,862 |align="left" |Sunk |- |align="right"|28 April 1918 |align="left" |[[List of shipwrecks in April 1918#28 April|''Elba'']] |align="left" |{{flag|United Kingdom|civil}} |align="right"|1,081 |align="left" |Sunk |- |align="right"|2 May 1918 |align="left" |[[List of shipwrecks in May 1918#2 May|''Thorsa'']] |align="left" |{{flag|United Kingdom|civil}} |align="right"|1,319 |align="left" |Sunk |- |align="right"|3 May 1918 |align="left" |[[List of shipwrecks in May 1918#3 May|''Vasilefs Georgios'']] |align="left" |{{flag|Greece|old}} |align="right"|3,651 |align="left" |Sunk |- |align="right"|10 June 1918 |align="left" |[[List of shipwrecks in June 1918#10 June|''Borg'']] |align="left" |{{flag|United Kingdom|civil}} |align="right"|2,111 |align="left" |Sunk |- |align="right"|11 June 1918 |align="left" |[[List of shipwrecks in June 1918#11 June|''Lorle'']] |align="left" |{{flag|United Kingdom|civil}} |align="right"|2,686 |align="left" |Sunk |- |align="right"|12 June 1918 |align="left" |[[List of shipwrecks in June 1918#12 June|''Kul'']] |align="left" |{{flag|United Kingdom|civil}} |align="right"|1,095 |align="left" |Sunk |- |align="right"|11 July 1918 |align="left" |[[List of shipwrecks in July 1918#11 July|''Kong Guttorm'']] |align="left" |{{flag|Norway}} |align="right"|731 |align="left" |Sunk |- |align="right"|15 July 1918 |align="left" |[[List of shipwrecks in July 1918#15 July|''Cap Breton'']] |align="left" |{{flag|France}} |align="right"|1,464 |align="left" |Sunk |- |align="right"|15 July 1918 |align="left" |[[List of shipwrecks in July 1918#15 July|''Vendee'']] |align="left" |{{flag|France}} |align="right"|892 |align="left" |Sunk |- |align="right"|16 July 1918 |align="left" |[[List of shipwrecks in July 1918#16 July|''Lyndiane'']] |align="left" |{{flag|France}} |align="right"|1,564 |align="left" |Sunk |- |align="right"|21 July 1918 |align="left" |[[List of shipwrecks in July 1918#21 July|''Arvor'']] |align="left" |{{flag|France}} |align="right"|961 |align="left" |Sunk |}
==References==
===Notes=== {{Reflist|group=Note}}
===Citations=== {{Reflist|colwidth=30em}}
== Bibliography == {{Refbegin}} * {{Cite book| last = Bendert| first = Harald |title=Die UB-Boote der Kaiserlichen Marine, 1914-1918. Einsätze, Erfolge, Schicksal | location = [[Hamburg]] | publisher = [[Verlag E.S. Mittler & Sohn GmbH]]| year = 2000 | isbn = 3-8132-0713-7 | language = German}} *{{cite book |last1=Gröner |first1=Erich |last2=Jung |first2=Dieter |last3=Maass |first3=Martin |translator-last1=Thomas |translator-first1=Keith |translator-last2=Magowan |translator-first2=Rachel |year=1991 |title=U-boats and Mine Warfare Vessels |volume=2 |series=German Warships 1815–1945 |location=London |publisher=Conway Maritime Press |isbn=0-85177-593-4 |ref=CITEREFGröner1991 }} *{{cite book |last1=Rössler |first1=Eberhard |title=Die deutschen U-Boote und ihre Werften: eine Bilddokumentation über den deutschen U-Bootbau; in zwei Bänden |date=1979 |publisher=[[Bernard & Graefe]] |location=[[Munich]] |volume=I|isbn=3-7637-5213-7|url=https://books.google.com/books?id=QIvfAAAAMAAJ |language=de}} {{Refend}}
{{German Type UB III submarines}}
{{DEFAULTSORT:UB103}} [[Category:German Type UB III submarines]] [[Category:World War I submarines of Germany]] [[Category:U-boats commissioned in 1917]] [[Category:1917 ships]] [[Category:Ships built in Hamburg]] [[Category:U-boats sunk in 1918]] [[Category:U-boats sunk by British aircraft]] [[Category:U-boats sunk by British warships]] [[Category:World War I shipwrecks in the English Channel]] [[Category:U-boats lost with all hands]]