Patent ID: 8827201

Claim:
A fairing for a ducted anti-torque tail rotor structure for a rotary wing aircraft, the ducted anti-torque tail rotor structure having a substantially longitudinal direction (L), the fairing having a rear portion that is substantially orthogonal to the longitudinal direction (L), said rear portion extending across a transverse span of the fairing between two transversally spaced-apart trailing edges and thus presenting a determined width, said rear portion closing at least a portion of the internal volume defined by the fairing and generating aerodynamic drag in forward flight, wherein the rear portion presents, at the trailing edges, recessed shapes that are perturbed on the streamlines of the air-flow and that are transversely discontinuous between the trailing edges of the ducted anti-torque tail rotor structure for the rotary wing aircraft, the recessed shapes being angularly spaced apart from one another along the trailing edges; the recessed shapes extending transversely and discontinuously from one trailing edge to the other trailing edge, over the surface of the rear portion located between the trailing edges; the recessed shapes forming and bounding an intermediate zone of the rear portion, said intermediate zone being located between two opposed recessed shapes on the two trailing edges.