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US 5,730,581 AGranted
Rotor blade
AssigneeDeutsche Forschungsanstalt fur Luft- und Raumfahrt e.V.
InventorsAndreas Buter, Matthias Piening
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AssigneeDeutsche Forschungsanstalt fur Luft- und Raumfahrt e.V.
InventorsAndreas Buter, Matthias Piening
Estimating the term…
A rotor blade made of fiber-reinforced synthetic resin has a profile which, at least in the region of the blade tip is designed so as to be twistable by actuators about the rotor blade longitudinal axis. The torsion skin of the rotor blade in the region of the blade tip is designed anisotropically in the sense of a tension/torsion coupling and a controllable actuator, which acts in a longitudinal direction of the rotor blade upon the rotor blade tip, is disposed in the rotor blade spar. To achieve anisotropy, the torsion skin is a uni-directional winding having a winding angle of less than 45.degree. relative to the rotor blade longitudinal axis. The winding angle is dependent upon the force-to-displacement ratio of the actuator and may lie between 18.degree. and 40.degree.. In the region of the blade tip, the anisotropic torsion skin is disposed resting loosely on the rotor blade spar.
A rotor blade made of fibre-reinforced synthetic resin and having a longitudinal axis and comprising a spar and a tip, wherein said blade has a torsion skin, said torsion skin in the region of said tip, being arranged anisotropically in the sense of a tension/torsion coupling, and wherein a controllable actuator is disposed in said spar, the profile of said blade, at least in the region of said tip, being twistable by said actuator, and said actuator acting upon said tip in the direction of said longitudinal axis.
Dependencies are inferred from the claim text.