NRP Douro was one of five Douro-class destroyer built for the Portuguese Navy during the 1930s.

The turbines, rated at 33,000 shaft horsepower (25,000 kW), were intended to give a maximum speed of 36 knots (67 km/h; 41 mph).

The destroyers carried enough fuel oil to give them a range of 5,400 nautical miles (10,000 km; 6,200 mi) at 15 knots (28 km/h; 17 mph).

[2] The five destroyers carried out patrols to defend Portugal's neutrality during the Second World War.

Douro reached a speed of 34.05 knots (63.06 km/h; 39.18 mph) at 28,085 shp (20,943 kW) during her post-refit trials.