The hazard posed by wake vortices trailing behind heavy airplanes to following aircraft has been well known, and the area has been researched to considerable depth since the introduction of the first jumbo jets in the early 1970s. The reader is referred to [1] for an outstanding review of the subject area. The present author has been active in this area since the early 1990s. Gurney flap is an aerodynamic concept that dates back to the 1970s. It represents a long and narrow plate placed at a wing's trailing edge on its pressure side and perpendicular to it. It was first proposed and utilized quite successfully by Dan Gurney as a means to increase the downforce on his racing cars. The concept has received some attention in the aerospace community; see, for example, [2-12], with rather limited implementation in actual airplane wing design. For a rather extensive review of Gurney flap-related research the reader is referred to [13]. It will be stated here only that the flap regularly increases both the wing's lift and drag and decreases its aerodynamic efficiency. The major effect of this modification is an increased circulation at the wing trailing edge.
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