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| Name | No | Yard No | Builder | Laid down | Launched | Comp | Fate |
|---|---|---|---|---|---|---|---|
| Orkla (ex-MMS1085) | 1950- M313 | East Anglian Constructors, Oulton Broad, UK | 22.4.1944 | 7.1944 | research vessel 1957 | ||
| Vefsna (ex-MMS1086) | 1950- M314 | East Anglian Constructors, Oulton Broad, UK | 3.8.1944 | 10.1944 | research vessel 1957 |
| Displacement standard, t | 360 |
|---|---|
| Displacement full, t | 430 |
| Length, m | 42.7 |
| Breadth, m | 8.51 |
| Draught, m | 3.15 deep load |
| No of shafts | 1 |
| Machinery | 1 diesel |
| Power, h. p. | 500 |
| Max speed, kts | 10 |
| Fuel, t | diesel oil 54 |
| Endurance, nm(kts) | 2000(9.5) |
| Armament | 2 x 1 - 20/70 Oerlikon Mk II/IV or 2 x 2 -20/70 Oerlikon Mk II/IV, mechanical, magnetic, acoustic minesweeping gear |
| Complement | 21 |
British 126ft MMS, enlarged variant of 115ft MMS. Wooden hull.
None.
No significant events.

