U87 1917
| Name | No | Yard No | Builder | Laid down | Launched | Comp | Fate |
| U87 | 31 | KW Danzig | 1915 | 22.5.1916 | 2.1917 | sunk 25.12.1917 | |
| U88 | 32 | KW Danzig | 1915 | 22.6.1916 | 4.1917 | sunk 5.9.1917 | |
| U89 | 33 | KW Danzig | 1915 | 6.10.1916 | 6.1917 | sunk 13.2.1918 | |
| U90 | 34 | KW Danzig | 1915 | 12.1.1917 | 8.1917 | to United Kingdom 11.1918 | |
| U91 | 35 | KW Danzig | 1915 | 14.4.1917 | 9.1917 | to France 11.1918 | |
| U92 | 36 | KW Danzig | 1915 | 12.5.1917 | 10.1917 | sunk 9.9.1918 |
|
Displacement standard, t |
|
|
Displacement normal, t |
757 / 998 |
|
Length, m |
65.8 |
|
Breadth, m |
6.20 |
|
Draught, m |
3.88 |
|
No of shafts |
2 |
|
Machinery |
2 MAN diesels / 2 SSW electric motors |
|
Power, h. p. |
2400 / 1200 |
|
Max speed, kts |
15.6 / 8.6 |
|
Fuel, t |
diesel oil 133 |
|
Endurance, nm(kts) |
11380(8) / 56(5) |
|
Armament |
U87 - 89: 1 x 1 - 105/43 TK L/45 C/16, 1 x 1 - 88/27 TK L/27 C/08, 4 - 500 TT (2 bow, 2 stern, 10 - 12) U90: 1 x 1 - 105/43 TK L/45 C/16, 4 - 500 TT (2 bow, 2 stern, 10 - 12) U91, 92: 1 x 1 - 105/42 Utof L/45 C/16, 4 - 500 TT (2 bow, 2 stern, 10 - 12) |
|
Complement |
36 |
|
Diving depth operational, m |
50 |
Project history: War order F. Double-hulled. The 'Project 25' boats, based on the U50. They had a diving time of 56 seconds, and in most respects resembled previous classes.
Modernizations: None.
Naval service: U87 was sunk by ramming and deep charges of British patrol boat P56 in the Irish Sea 25.12.1917. U88 was mined 5.9.1917 in the Deutsche Bight. U89 was rammed by British cruiser Roxburgh 13.2.1918 in the Atlantic. U92 was mined in the North Sea 9.9.1918.
© Ivan Gogin, 2014