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A flap mechanism comprising a wing, a flap pivotally supported below the wing, flap operating mechanism all without the airstream and comprising a support secured to the wing structure and extending in a fore and aft direction within the wing and having a guiding cam slot formed therein, a link pivoted at one end to said support and at the other end to said flap at a point spaced rearwardly from the nose of the flap, a pivot piece secured to the flap adjacent the nose thereof and. co‐operating with said guiding cam slot, the convolutions of said cam slot being such as to insure that the trailing edge of the flap shall move within small limits of tolerance within the locus of lines drawn perpendicular to the datum lines of the wing sections and which pass through the trailing edge of the wing.