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Aircraft structure comprising a pair of normally abutting airfoils having a pair of spaced opposite outer surfaces, each surface being substantially continuous with respect to the pair of airfoils when the airfoils are in abutment, a pivotal connection between said airfoils adjacent a first one of said surfaces, motor means attached to a first one of said airfoils and having a projecting and retracting element directed toward the second of said airfoils, a link pivoted to said first airfoil adjacent said first surface and pivotally attached at its outer end to the projecting and retracting clement for defining movement thereof in a predetermined are with respect to said first airfoil, said are of movement being generally adjacent the second of said pair of spaced surfaces, and a second link connecting pivotally between the pivotal connexion of the first link with the projecting and retracting element and a point on said second airfoil adjacent said second surface.