SM U-31 (Austria-Hungary)
| History | |
|---|---|
| Austria-Hungary | |
| Name | SM U-31 |
| Ordered | 12 October 1915 |
| Builder | Ganz Danubius, Fiume |
| Laid down | 4 July 1916 |
| Launched | 20 March 1917 |
| Commissioned | 24 April 1917 |
| Fate | Scrapped 1920 |
| Service record | |
| Commanders: |
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| Victories: |
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| General characteristics | |
| Type | U-27-class submarine |
| Displacement |
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| Length | 121 ft 1 in (36.91 m) |
| Beam | 14 ft 4 in (4.37 m) |
| Draft | 12 ft 2 in (3.71 m) |
| Propulsion |
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| Speed |
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| Complement | 23–24 |
| Armament |
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SM U-31 or U-XXXI was a U-27 class U-boat or submarine for the Austro-Hungarian Navy. U-31, built by the Hungarian firm of Ganz Danubius at Fiume, was launched in March 1917 and commissioned in April.
U-31 had a single hull and was just over 121 feet (37 m) in length. She displaced nearly 265 metric tons (261 long tons) when surfaced and over 300 metric tons (295 long tons) when submerged. Her two diesel engines moved her at up to 9 knots (17 km/h; 10 mph) on the surface, while her twin electric motors propelled her at up to 7.5 knots (13.9 km/h; 8.6 mph) while underwater. She was armed with two bow torpedo tubes and could carry a load of up to four torpedoes. She was also equipped with a 75 mm (3.0 in) deck gun and a machine gun.
In October 1917, U-31 sank while in port at Porto Bergudi and was out of service through April 1918 while she was raised and repaired. During her service career, U-31 sank two ships and damaged one warship, sending a combined tonnage of 4,088 to the bottom. U-31 was at Cattaro at war's end and was awarded to France as war reparation in 1920, towed to Bizerta and scrapped there.