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| Name | No | Yard No | Builder | Laid down | Launched | Comp | Fate |
|---|---|---|---|---|---|---|---|
| U48 | 85 | CNT, Monfalcone | 11/1916 | --- | --- | BU incomplete | |
| U49 | 86 | CNT, Monfalcone | 12/1916 | --- | --- | BU incomplete |
| Displacement standard, t |
|
|---|---|
| Displacement normal, t | 818 / 1184 |
| Length, m | 73.3 |
| Breadth, m | 6.70 |
| Draught, m | 3.30 |
| No of shafts | 2 |
| Machinery | 2 diesels / 2 electric motors |
| Power, h. p. | 2400 / 1200 |
| Max speed, kts | 16.2 / 8.5 |
| Fuel, t | diesel oil |
| Endurance, nm(kts) | 4000(10) / 100(2.5) |
| Armament | 2 x 1 - 90/32 G. L/35 BAG, 6 - 450 TT (4 bow, 2 stern, 9) |
| Complement | 32 |
| Diving depth operational, m | 50 |
Built by CNT Pola using a German AG Weser design, none was ever launched. U48 was 70% complete, and U49 55% complete at the end of the war; all were broken up in 1920. Sisterboats U58 and U59 were never laid down.
Many thanks to Wolfgang Stöhr for additional information on this page.

