Abstract: A carrying wing having a movable flap, an outer skin of plastics formed continuously without gap from the carrying wing surface to the flap surface, the skin being designed as a thin flexible membrane spanning the transition zone between the carrier wing surface and the flap surface. The skin is secured to the carrier wing surface and to the flap surface at respective positions thereon, and cam guides serve as bearings, which on actuation of the flap, cause the securing position of the membrane on the flap to follow a track which is at least approximately spiral shaped, in order to control the securing position of the membrane on the carrying surface.