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An aerodynamic component such as a helicopter rotor blade has an aerodynamic flow profile, a free end and a mounting end forming a blade root for attachment to a rotor mast. A blade section between the root and the free end has a leading edge and a trailing edge as viewed in the flow or chord direct

An aerodynamic component such as a helicopter rotor blade has an aerodynamic flow profile, a free end and a mounting end forming a blade root for attachment to a rotor mast. A blade section between the root and the free end has a leading edge and a trailing edge as viewed in the flow or chord direction. The blade is enclosed on its suction side and its pressure side with a respective skin. A nose flap or leading edge flap is secured to the leading edge by a bearing or hinge. The blade tilting angle is adjustable by piezo-drive elements arranged in at least one pair forming an actuator for each nose flap. The piezo-elements of a pair are arranged in the chord direction one behind the other and the pair is secured to the body of the blade by a fixed point positioned between the elements of a pair. The expansion and contraction from the piezo-element closer to the trailing edge is transmitted to the flap by a push rod. The expansion and contraction of the piezo-element closer to the leading edge is transmitted to the flap by a pronged pull-fork. The push rod and the pull-fork drive a free end of a lever secured to the flap, whereby a displacement of the push rod or of the pull fork causes the tilting adjustment of the flap by a push-pull action.

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1. A component having an aerodynamic flow profile, said component comprising a profile body having a leading edge, a trailing edge, and at least one profile section positioned between ends of said profile body, a leading edge flap (2), a flap bearing (80) tiltably mounting said leading edge flap to

1. A component having an aerodynamic flow profile, said component comprising a profile body having a leading edge, a trailing edge, and at least one profile section positioned between ends of said profile body, a leading edge flap (2), a flap bearing (80) tiltably mounting said leading edge flap to said profile section for tilting about a bearing axis extending lengthwise in said component, a piezoelectric drive connected to said leading edge flap for tilting said leading edge flap, said piezoelectric drive comprising at least a first piezo-drive element (10) and a second piezo-drive element (20) arranged one behind the other in a chord direction (CD) of said profile section, so that said first piezo-drive element (10) is positioned to face said trailing edge (TE) and said second piezo-drive element (20) is positioned to face said leading edge (LE), a fixed mounting point (50) secured in said profile body between said first and second piezo-drive elements for movably holding said first and second piezo-drive elements, a lever (90A) having a first lever end (80') rigidly connected to said leading edge flap (2) and a second lever end (90), a first force transmitting member (60) positioned for transmitting a piezo-motion of said first piezo-drive element (10) to said second lever end (90) and a second force transmitting member (70) positioned for transmitting a piezo-motion of said second piezo-drive element (20) to said second lever end (90) for causing a flap motion of said leading edge flap (2) in response to said piezo-motions.