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| Names | Builders | Commissioned | Losses | Transfers | Discarding |
|---|---|---|---|---|---|
S509 (ex-MAS549) |
CRDA, Monfalcone, Italy: S509 |
1939 // 9.1943: S509 |
S509 (22.5.1944) |
none |
none |
| Displacement standard, t | 21 |
|---|---|
| Displacement full, t | 23 |
| Length, m | 18.7 |
| Breadth, m | 4.60 |
| Draught, m | 1.30 |
| No of shafts | 2 |
| Machinery | 2 Isotta-Frascini Asso 1000 petrol engines / 2 Carraro CDM petrol engines for cruising |
| Power, h. p. | 2000 / 100 |
| Max speed, kts | 42 / 6.5 |
| Fuel, t | petrol 3.9 |
| Endurance, nm(kts) | 1000(6) |
| Armament | 1 x 1 - 13.2/76, 2 - 450 TT, 1 DCR (6) |
| Complement | 10 |
Italian MAS549 was captured in September, 1943 and commissioned by Germans as S509.
None.
S509 was transferred to RSI in spring 1944 and sunk 22.5.1944.

