Patent ID: 7413408

Claim:
A replaceable spoiler for the trailing edges of blades and airfoils used for preventing the formation of an organized Karmen vortex on the top surface of the trailing edge where it would otherwise become a target for the next blade or airfoil entering the same air space and create undesired noise and vibration, said spoiler comprising: a substantially thin and elongated flap made from resilient and flexible material that bends with resistance and is capable of high-speed oscillating movement without permanent deformation, said flap also having a distal edge with a plurality of projections each comprising a shape and pitch different from the next adjacent one of said projections, with said projections collectively defining a non-repeating pattern of angular indentations that when attached to a trailing edge directs airflow under the trailing edge rearward and downward to create disorganized discharge that will not sustain vortex formation.