jet flaps

An arrangement in which the efflux of air or a jet stream in the form of a sheet of air is ejected under pressure at or near the trailing edge of the airfoil. This helps to control the boundary layer, and if this sheet of air can be deflected, the reaction of the jet also will contribute directly to the lift augmentation. See also blown flaps.
Internally blown flap.

Aviation dictionary. 2014.

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