SM UB-41 was a German Type UB II submarine or U-boat in the German Imperial Navy (German: Kaiserliche Marine) during World War I.
A Type UB II submarine, UB-41 had a displacement of 274t when at the surface and 303t while submerged. She had a total length of 36.9m (121.1feet), a beam of 4.37m (14.34feet), and a draught of 3.69m (12.11feet). The submarine was powered by two Körting six-cylinder diesel engines producing a total 284PS, two Siemens-Schuckert electric motors producing 280PS, and one propeller shaft. She was capable of operating at depths of up to .
The submarine had a maximum surface speed of and a maximum submerged speed of . When submerged, she could operate for at ; when surfaced, she could travel at . UB-41 was fitted with two torpedo tubes, four torpedoes, and one 8.8sp=usNaNsp=us Uk L/30 deck gun. She had a complement of twenty-one crew members and two officers and a 42-second dive time.
The U-boat was ordered on 22 July 1915 and launched on 6 May 1916. She was commissioned into the German Imperial Navy on 25 August 1916 as SM UB-41.
The submarine sank eight ships in thirteen patrols. They included the William Cory and Son collier, which UB-41 torpedoed in the North Sea off Robin Hood's Bay on 8 September 1917. UB-41 was reported missing on 5 October 1917. The same day, a large explosion was observed from the coast at Scarborough, England. The case of her loss was either an internal explosion, or she struck a mine, possibly a German one, and sank in the North Sea on 5 October 1917.
Her wrecksite was discovered in 1989 and surveyed in 1997 and 2003. The vessel is broken into two sections, at degree angles laying on the starboard side, and showing signs of impact damage.
| Date | Name | Nationality | Tonnage[1] | Fate[2] | |
|---|---|---|---|---|---|
| 21 November 1916 | Thyholmen |  Norway | 259 | Captured as prize | |
| 18 January 1917 | Cetus |  United Kingdom | 139 | Damaged | |
| 19 April 1917 | Ellida | Norway | 1,124 | Sunk | |
| 22 May 1917 | Lanthorn | United Kingdom | 2,299 | Sunk | |
| 23 May 1917 | Monarch | Norway | 1,318 | Sunk | |
| 12 June 1917 | Alwyn | United Kingdom | 73 | Sunk | |
| 13 June 1917 | Silverburn | United Kingdom | 284 | Sunk | |
| 14 June 1917 | Angantyr |  Denmark | 1,359 | Sunk | |
| 6 August 1917 | Talisman | United Kingdom | 153 | Sunk | |
| 8 September 1917 | Harrow | United Kingdom | 1,777 | Sunk | |
| 3 October 1917 | Clydebrae | United Kingdom | 502 | Damaged |