Aerodynamic profile with a reversibly deformable contour for aircraft, in particular for rotary wing aircraft

A rotary wing aircraft rotor blade with a contour that is reversibly deformable, the rotor blade comprising:

• a front solid profile region;
• a rear hollow profile region connected to and rearward of the front solid profile region, the rear profile region comprising:
• a first cover skin on a pressure side of the rear profile region;
• a second cover skin on a suction side of the rear profile region, wherein the first cover skin and the second cover skin merge at a trailing edge of the rotor blade;
• the first cover skin and the second cover skin closing off the rear hollow profile region by a sealed coating of the pressure side and of the suction side of the rotor blade;
• an elastic core layer disposed along an inwards-facing surface of each of the first cover skin and the second cover skin to form the rear hollow profile region therebetween;
• at least one layer design of fiber reinforced material having at least one targeted bending line of the cover skins formed adjacent the trailing edge, the targeted bending line defined by at least one of an interruption and an undulation or strand of the layer design of fiber reinforced material;
• and
• at least one piezoelectric actuator attached to the first and second cover skins at effective connections along the layer design of fiber reinforced material for controllably setting the position of the rear hollow profile region relative to the front solid profile region,
• wherein, the rear hollow profile region is elastically deformable at the targeted bending lines which form reversal points upon actuation of the at least one piezoelectric actuator as an integral Flettner flap being reversibly deformable to define the contour of the rear hollow profile region in an s-shaped manner.

An rotary wing aircraft rotor blade with a contour that is reversibly deformable, the rotor blade comprising:

• an aerodynamic profile defined by a first cover skin on a pressure side of the profile and a second cover skin on a suction side of the profile, the skins defining at least one hollow profile region therebetween, the first and second cover skins having an elastic layer extending along at least a portion of an inward-facing surface,
• at least one layer design of fiber reinforced material having at least one targeted bending line of the cover skins formed adjacent a trailing edge of the profile, the targeted bending line defined by at least one of an interruption and an undulation or strand of the layer design of fiber reinforced material;
• and
• at least one piezoelectric actuator attached to the first and second cover skins at effective connections along the layer design of fiber reinforced material for controllably setting the position of the hollow profile region,
• wherein the hollow profile region is elastically deformable at the targeted bending lines which form reversal points upon actuation of the at least one piezoelectric actuator as an integral Flettner flap being reversibly deformable, thereby elastically deforming the aerodynamic profile to define a generally s-shaped profile along to the hollow profile region.