[6] Five Yarrow or White-Forster boilers fed direct-drive steam turbines driving three propeller shafts.

The machinery was rated at 14,300 shaft horsepower (10,700 kW) to give a speed of 27 knots (50 km/h; 31 mph).

[10][11] Wartime modifications included replacement of the aft torpedo tube by a 3-pounder (47 mm) anti-aircraft gun in some ships,[6] while depth charges were also fitted.

As the Beagles completed in 1910, they joined the 1st Destroyer Flotilla of the Royal Navy's Home Fleet.

[2] They were officially redesignated the G class in October 1913 as part of a general re-designation of the Royal Navy's destroyers.