...
To overcome the inherent unknowns in the circumferential plasma design, a set of canards was designed that would stall under normal conditions and upon activation of the plasma generate significant torque to change the roll rate of the vehicle. This system was proven in the Wright Brothers Wind Tunnel in May of 2016.
Working Theory
Using copper and kapton electrodes high voltage, high frequency power causes the breakdown of air. The charged environment near the electrodes then accelerates the plasma, adding momentum to the stream over that surface. This can be used to unstall airfoils or decrease drag.
Plasma Drag Reduction Whitepaper
...