Wing construction for ornithopter

The invention relates to a wing construction for performing change of place or performing work, the wing construction has a surface of which extent is variable, and which is advantageously windable (rollable) or which is constructed from plates formed like an accordion or can be slid overlapping each other or of which material is elastic. The outer edge (2) of the surface (1) is led continuously along the surface of an imaginary closed contour based body, the inner edge (3) of the surface (1) is located inside or outside the imaginary closed contour based body, advantageously perpendicular to the base of the imaginary closed contour based body.