A method and apparatus for reducing noise produced by the airframe of an airplane in flight. The present invention provides a smooth, continuous, arcuate surface, such as a rounded edge cap, for the lateral surface of any airplane flap exposed to fluid having relative motion with respect to the airplane. Tests indicate that a rounded flap edge cap made in accordance with the present invention is effective in attenuating noise levels in the middle and high frequency range, i.e., between about 500 to about 10000 Hz.
[ The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:] [1.] In an airplane wing having an inboard portion and an outboard portion, an upper wing surface, a lower wing surface, and a trailing edge formed at the juncture of said upper and lower surfaces, said wing being capable of relative motion through a fluid, an apparatus for reducing noise levels created by said wing when said wing is moving through said fluid, comprising:a flap positioned at said trailing edge on said wing and disposed betwe...
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