U1 1911
| Name | No | Yard No | Builder | Laid down | Launched | Comp | Fate |
| U1 | Marinearsenal Pola | 7/1907 | 10.2.1909 | 11/1909 | BU 1920 | ||
| U2 | Marinearsenal Pola | 7/1907 | 3.4.1909 | 12/1909 | BU 1920 |
|
Displacement normal, t |
230 / 270 |
|
Displacement full, t |
|
|
Length, m |
30.5 |
|
Breadth, m |
3.35 |
|
Draught, m |
3.20 |
|
No of shafts |
2 |
|
Machinery |
2 petrol engines / 2 electric motors |
|
Power, h. p. |
640 / 200 |
|
Max speed, kts |
10.3 / 5 |
|
Fuel, t |
petrol |
|
Endurance, nm(kts) |
950(6) / 40(3) |
|
Armament |
3 - 450 TT (2 bow, 1 stern, 5) |
|
Complement |
17 |
| Diving depth operational, m | 30 max |
Project history: Built to the design of the American Simon Lake at the Pola N Yd and had the features typical of this submarine designer: two retractable wheels for movement over the seabed, a diving chamber under the bow and variable pitch propellers. The diving tanks were situated on top of the cylindrical single hull, above the waterline, which meant that a heavy ballast keel was necessary to provide vertical stability, and had to be flooded by pumps, the whole operation totalling 8 minutes. Furthermore the gasoline engines could not be considered effective under war conditions and did not reach the contract power, so the Austro-Hungarian Navy only paid for the hulls and armament. Thereafter new diesels were ordered in Austria and until their delivery the original engines were employed on lease. U 2 was given a small conning tower in 1915.
Modernizations: 5.1915, U1, 3.1916, U2: petrol engines were replaced by diesels (640hp)
1917, both: + 1 x 1 - 37/20 SFK L/23 H
1/1918, both: - 1 x 1 - 37/20
Naval service: During the war both units served as training boats and were declared obsolete on 11 January 1918; both were ceded to Italy as war reparations in 1920 and scrapped at Pola.
U1 1917
© Ivan Gogin, 2014