Abstract: A vortex attenuating airfoil (24) includes an outboard area (28). The outboard area includes a deflector (40) which is disposed in the inboard direction from a tip (30). An air passage (46) extends through the airfoil from an inlet (48) on a high pressure side of said airfoil to an outlet (50) on a low pressure side of the airfoil. The outlet (50) is positioned in the outboard area between said deflector and the tip. In operation, air passes through the air passage to attenuate the naturally occurring vortex adjacent to the tip of the airfoil thereby reducing drag.

Abstract: An airfoil (24) providing vortex attenuation includes an outboard area (28). The outboard area has a foil extension portion (30) having a high pressure surface (32). The high pressure surface has an arcuate shape that increases in length from a leading edge (36) to a trailing edge (38) of the airfoil. The outboard area further includes an orifice portion (40) with an opening (42) therein. The opening in the orifice portion has a swirler (44) mounted therein. The swirler and the high pressure surface cause the air passing under the wing toward the outboard area to rotate with controlled direction and velocity consistent with the rotational direction of a naturally occurring vortex at the outboard area of the wing. As a result, the natural tip vortex is attenuated reducing drag on the airfoil.