SM UB-91
German submarine
From Wikipedia, the free encyclopedia
SM UB-91 was a German Type UB III submarine or U-boat in the German Imperial Navy (German: Kaiserliche Marine) during World War I. She was commissioned into the German Imperial Navy on 11 April 1918 as SM UB-91.[Note 1]
UB-148 at sea, a U-boat similar to UB-91. | |
| History | |
|---|---|
 German Empire | |
| Name | UB-91 |
| Ordered | 6 / 8 February 1917[1] |
| Builder | AG Vulcan, Hamburg |
| Cost | 3,654,000 German Papiermark |
| Yard number | 107 |
| Launched | 6 March 1918[2] |
| Commissioned | 11 April 1918[2] |
| Fate | Surrendered 21 November 1918, broken up in 1921[2] |
| General characteristics [2] | |
| Class & type | Type UB III submarine |
| Displacement | |
| Length | 55.52 m (182 ft 2 in) (o/a) |
| Beam | 5.76 m (18 ft 11 in) |
| Draught | 3.73 m (12 ft 3 in) |
| Propulsion |
|
| Speed |
|
| Range |
|
| Test depth | 50 m (160 ft) |
| Complement | 3 officers, 31 men[2] |
| Armament |
|
| Service record | |
| Part of |
|
| Commanders |
|
| Operations | 2 patrols |
| Victories |
|
On 4 October 1918 UB-91 sank the Hirano Maru, killing among others, Yokohama Specie Bank sub-manager S. Ujie, his wife and three sons, together with bank employee Takashi Aoki and wife Sueko.[4][5]
Construction
She was built by AG Vulcan of Hamburg and following just under a year of construction, launched at Hamburg on 6 March 1918. UB-91 was commissioned later the same year. Like all Type UB III submarines, UB-91 carried 10 torpedoes and was armed with a 10.5 cm (4.13 in) deck gun. UB-91 would carry a crew of up to 3 officer and 31 men and had a cruising range of 7,120 nautical miles (13,190 km; 8,190 mi). UB-91 had a displacement of 510 t (500 long tons) while surfaced and 640 t (630 long tons) when submerged. Her engines enabled her to travel at 13 knots (24 km/h; 15 mph) when surfaced and 7.4 knots (13.7 km/h; 8.5 mph) when submerged.
Service history
UB-91 was surrendered to Britain on 21 November 1918 at Harwich. She toured the South Wales ports of Cardiff, Newport, Swansea, Port Talbot and was towed to Pembroke Dock, eventually being broken up in Briton Ferry in 1921.[6] King George V presented her deck gun to the town of Chepstow by in recognition of the bravery of William Charles Williams RN VC at Gallipoli in 1915. The gun forms part of the Chepstow War Memorial.[7][8]
Summary of raiding history
| Date | Name | Nationality | Tonnage[Note 2] | Fate[9] |
|---|---|---|---|---|
| 25 September 1918 | Hebburn |  United Kingdom |
1,938 | Sunk |
| 26 September 1918 | USCGC Tampa |  United States Coast Guard |
1,181 | Sunk[10] |
| 28 September 1918 | Baldersby | United Kingdom |
3,613 | Sunk |
| 4 October 1918 | Hirano Maru |  Japan |
7,936 | Sunk[10] |
