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| Name | No | Yard No | Builder | Laid down | Launched | Comp | Fate |
|---|---|---|---|---|---|---|---|
| U50 | Danubius, Fiume | 3/1917 | --- | --- | BU incomplete | ||
| U51 | Danubius, Fiume | 4/1917 | --- | --- | BU incomplete |
| Displacement standard, t |
|
|---|---|
| Displacement normal, t | 840 / 1100 |
| Length, m | 73.5 |
| Breadth, m | 6.30 |
| Draught, m | 4.00 |
| No of shafts | 2 |
| Machinery | 2 diesels / 2 electric motors |
| Power, h. p. | 2300 / 1200 |
| Max speed, kts | 16.5 / 9 |
| Fuel, t | diesel oil |
| Endurance, nm(kts) | 4000(10) / 100(2.5) |
| Armament | 2 x 1 - 100/32 G. L/35 BAG, 6 - 450 TT (4 bow, 2 stern, 9) |
| Complement | 33 |
| Diving depth operational, m | 50 |
All built by Danubius Fiume (Project 835, Germania type license-built). U50 was 90% complete at the end of the war, and U51 60%; they were broken up in 1920. Sister boats U56 and U57 were never laid down.

