Swept wings of commercial passenger jets experience skin friction drag from the turbulent boundary layers over them. Unique to such wings is the turbulent transition induced by a crossflow instability, where the laminar boundary layer diverges from the inviscid airflow due to competing forces. Dielectric Barrier Discharge (DBD) actuators have minimised this divergence by applying a uniformspanwise plasma body force against the boundary layer, and delayed transition. Yet, the unsteadiness of the AC plasma discharge can induce early transition, and weak body forces limit their control effectiveness at high Reynolds numbers. Therefore, thisMasters thesis characterised the effects of Extended DBD actuators, where the presence of a positive DC electrode to maximise body forces and minimise unsteady disturbances in the plasmawas studied. Promising results were seen in the form of increased body forces and decreased Turbulent Kinetic Energy addition to the flow, compared to a traditional DBD actuator.