| Career (German Empire) | |
|---|---|
| Name: | U-31 |
| Ordered: | 29 Mar 1912 |
| Builder: | Germaniawerft, Kiel (Werk 191) |
| Laid down: | 12 Oct 1912 |
| Launched: | 7 Jan 1914 |
| Commissioned: | 18 Sep 1914 |
| Fate: | 13 Jan 1915 - Final fate unknown. Possibly mined off E coast of UK. 31 dead (all hands lost). |
| General characteristics | |
| Class and type: | German Type U 31 submarine |
| Displacement: | 685 tons (surfaced) 878 tons (submerged) 971 tons (total) |
| Length: | 64.70 m (overall) 52.36 m (pressure hull) |
| Beam: | 6.32 m (overall) 4.05 m (pressure hull) |
| Height: | 7.68 m |
| Draught: | 3.56 m |
| Propulsion: | Diesel (2 x 950 PS) Electric (2 x 600 PS) 1850 hp (surfaced) 1200 hp (submerged) |
| Speed: | 16.4 knots (surfaced) 9.7 knots (submerged) |
| Range: | 8790 miles @ 8 kn (surfaced) 80 miles @ 5 kn(submerged)[1] |
| Test depth: | 50 m |
| Complement: | 4 officers 31 crewmen |
| Armament: | |
| Service record | |
|---|---|
| Part of: | Kaiserliche Marine |
| Commanders: | Siegfried Wachendorff 1 Aug 1914 - 13 Jan 1915 |
| Operations: | 1 patrol |
SM U-31 was one of the 329 submarines serving in the Imperial German Navy (Kaiserliche Marine) in World War I. U-31 was engaged in the naval warfare and took part in the First Battle of the Atlantic.
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