Patent ID: 7984879

Claim:
A flow control actuator for a body exposed to fluid flow, said control actuator comprising: a first and a second flow surface each exposed to said fluid flow and spaced to define an elongate gap therebetween; an elongate control element disposed in or adjacent said gap and having an externally facing arcuate Coanda surface, said control element defining a first slot between said control element and said first flow surface and a second slot between said control element and said second flow surface, and being moveably mounted to allow a respective width of each slot to be adjusted generally proportionally, and delivery means for delivering a flow of pressurized flow control fluid to exhaust through at least one of said first and said second flow slots and to pass over said arcuate Coanda surface into said fluid flow, wherein said first and second flow surfaces include respective upper and lower surfaces or portions thereof of an aerofoil section.