|   Sistership HDMS Storen  | |
| History | |
|---|---|
| Name | Ravnen | 
| Namesake | Raven in Danish | 
| Builder | Danyard A/S, Frederikshavn | 
| Launched | 1994 | 
| Commissioned | 7 October 1994 | 
| Decommissioned | 7 October 2010 | 
| Identification | Hull number: P560 | 
| Fate | Sold to Portugal | 
| Name | Douro | 
| Acquired | October 2014 | 
| Commissioned | 2015 | 
| Identification | Hull number: P591 | 
| Status | In service | 
| General characteristics [1] [2] [3] | |
| Class & type | Flyvefisken-class patrol vessel | 
| Displacement | 400 tonnes (394 long tons) | 
| Length | 54 m (177 ft 2 in) | 
| Beam | 9 m (29 ft 6 in) | 
| Draught | 3.60 m (11 ft 10 in) | 
| Propulsion | 
  | 
| Speed | 20 knots (37 km/h; 23 mph) (28 knots (52 km/h; 32 mph) with gas turbine) | 
| Range | 2,000 nmi (3,700 km) | 
| Boats & landing craft carried  | 1x RHIB | 
| Complement | 19 | 
| Sensors & processing systems  | |
| Armament | 
  | 
NRP Douro (P591) (ex-HDMS Ravnen (P560)) is a former patrol boat of the Royal Danish Navy. Since 2015 she is in service with the Portuguese Navy.
She is the fourth ship from series 2 of the Flyvefisken class, which is also known as the Standardflex 300 or SF300 class. She was launched in 1994, with the commissioning taking place on 7 October 1994.
In October 2014, Ravnen was sold to the Portuguese Navy together with four other ships of the class. She was renamed Douro. After a refit she was commissioned in 2015.