1. Design

2. Construction and career

3. References
    Notes  Citations  Bibliography 

SM UC-90 was a German Type UC III minelaying submarine or U-boat in the German Imperial Navy ({{lang-de|Kaiserliche Marine}}) during World War I.

Design

A German Type UC III submarine, UC-90 had a displacement of {{convert|491|t|LT}} when at the surface and {{convert|571|t|LT}} while submerged. She had a length overall of {{convert|56.51|m|ftin|abbr=on}}, a beam of {{convert|5.54|m|ftin|abbr=on}}, and a draught of {{convert|3.77|m|ftin|abbr=on}}. The submarine was powered by two six-cylinder four-stroke diesel engines each producing {{convert|300|PS|kW shp}} (a total of {{convert|600|PS|kW shp}}), two electric motors producing {{convert|770|PS|kW shp}}, and two propeller shafts. She had a dive time of 15 seconds and was capable of operating at a depth of {{convert|75|m}}.{{sfn|Gröner|1991|pp=34-35}}

The submarine was designed for a maximum surface speed of {{convert|11.5|kn}} and a submerged speed of {{convert|6.6|kn}}. When submerged, she could operate for {{convert|40|nmi}} at {{convert|4.5|kn}}; when surfaced, she could travel {{convert|9850|nmi}} at {{convert|7|kn}}. UC-90 was fitted with six {{convert|100|cm}} mine tubes, fourteen UC 200 mines, three {{convert|50|cm}} torpedo tubes (one on the stern and two on the bow), seven torpedoes, and one {{convert|10.5|cm|in|sp=us|abbr=on}} SK L/45 or {{convert|8.8|cm|in|sp=us|abbr=on}} Uk L/30 deck gun . Her complement was twenty-six crew members.{{sfn|Gröner|1991|pp=34-35}}

Construction and career

The U-boat was ordered on 12 January 1916 and was launched on 19 January 1918. She was commissioned into the German Imperial Navy on 15 July 1918 as SM UC-90.^[3] As with the rest of the completed UC III boats, UC-90 conducted no war patrols and sank no ships. She was surrendered to Japan on 1 December 1918. The U-boat was renamed O-4 for Japanese service from 1920 to 1921. In 1921 O-4 was partially dismantled at the Kure Navy Yard. Between 1924 and 1926, the hulk of O-4 was used as an antisubmarine warfare target before being sold for scrap.{{sfn|Gröner|1991|p35}}

References

Notes

Citations

Bibliography

• {{cite book

• {{cite book

• {{cite book | last = Gardiner | first = Robert, ed. | title = Conway's All the World's Fighting Ships, 1906–1921 | location = Annapolis, Maryland | publisher = Naval Institute Press | year = 1985 | isbn = 978-0-87021-907-8 | oclc = 12119866 }}
• {{cite book | last = Tarrant | first = V. E. | title = The U-Boat Offensive: 1914–1945 | location = Annapolis, Maryland | publisher = Naval Institute Press | year = 1989 | isbn = 978-0-87021-764-7 | oclc = 20338385 }}

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