[2] The turbines developed a total of 24,500 shaft horsepower (18,300 kW) and gave a maximum speed of 29 knots (54 km/h; 33 mph).

The ships carried a maximum of 280 long tons (280 t) of fuel oil that gave them a range of 1,750 nautical miles (3,240 km; 2,010 mi) at 15 knots (28 km/h; 17 mph).

[3] She was built during the First World War as part of an emergency program of naval construction, to an Admiralty design by William Beardmore & Company, Dalmuir.

She was originally to have been named Magic but she was renamed Lassoo on 15 February 1915 before being launched on 24 August 1915.

She was sunk by the German U-boat SM UB-10 on 13 August 1916 off the Maas lightship in the North Sea.