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| Name | No | Builder | Laid down | Launched | Comp | Fate |
| i | Germaniawerft, Kiel, Germany | --- | --- | --- | cancelled 10/6/1940 | |
| ii | Germaniawerft, Kiel, Germany | --- | --- | --- | cancelled 10/6/1940 | |
| iii | Germaniawerft, Kiel, Germany | --- | --- | --- | cancelled 10/6/1940 |
|
Displacement standard, t |
|
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Displacement normal, t |
413 / |
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Length, m |
|
|
Breadth, m |
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Draught, m |
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No of shafts |
2 |
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Machinery |
diesels / electric motors |
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Power, h. p. |
|
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Max speed, kts |
16 / 8.5 |
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Fuel, t |
diesel oil |
| Endurance, nm(kts) | |
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Armament |
5 - 533 TT (4 bow, 1 stern) |
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Complement |
|
| Diving depth operational, m |
Ship project history: 24/5/1939 Bulgarian government ordered to Germaniaweft in Kiel three submarines with delivery date in 1941 — 1942. Project represented the medium submarine with dimensions between German boats of II and VII series. In connection with beginning of Second World War building actually never been begun (spadework was conducted only), the contract was cancelled by German party 10/6/1940.
© Ivan Gogin, 200
9-11