Patent ID: 7458777

Claim:
A blade for a wind turbine, said blade comprising: a blade body defining a leading edge and a trailing edge and adapted for movement in response to a wind flow over the body, the body further defining a high pressure side and a low pressure side joined along the trailing edge; and a rigid acoustic flap comprising a first substantially planar surface, a second substantially planar surface, and a substantially smooth distal end, the flap having a substantially constant thickness measured between the first and second surfaces, the flap coupled to and extending outward from at least one of the high pressure side and the low pressure side and extending along the body trailing edge, a first portion of the first planar surface extending along the respective side, a second portion of the first planar surface extending outward from the trailing edge substantially parallel to the respective side, said second substantially planar surface extending outwardly from one of the high pressure side and low pressure side a distance approximately equal to the flap thickness.