Deformable aerodynamic profile for rotorcraft

An aerodynamic profile 12 for a rotorcraft has a main profile body 14 that is flexible in the profile depth direction T. Upper and a lower covering skins 16, 18 envelop the main profile body 14 and are embodied in tension-stiff and compression-stiff fashion. A non-discrete flap-like rear profile deformation region 22 without bearings or hinges is embodied in the rear profile edge region of the rotor blade profile 12, and at least one actuator 32, 32' is arranged in the main profile body 14. By means of the actuator a flexural motion of the main profile body 14 can be initiated, so that the rearprofrie deformation region 22 can be deformed, by way of a curvature, resulting from the flexural motion of the main profile body 14, of the upper and lower covering skins 16, 18, to yield a rotor blade excursion directed in the opposite direction to the flexural motion. The actuators may be piezoelectric 32 or discrete 32'; the discrete actuators 32' may torsional (fig.5), flexural (figs.6,9), linear (figs.7,8) or may operate via a lever (36, figs.10,11). Flexurally soft struts 30 may be provided in a hollow chamber 28 in the central profile region 24.