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The invention concerns a Wells turbine, comprising a hub with a plurality of rotor blades having a drop-shaped profile orienting from a profile nose; the rotor blades are attached to the hub in a rotary fashion by means of a foot part such that the rotor blade angle is variable with respect to the p

The invention concerns a Wells turbine, comprising a hub with a plurality of rotor blades having a drop-shaped profile orienting from a profile nose; the rotor blades are attached to the hub in a rotary fashion by means of a foot part such that the rotor blade angle is variable with respect to the plane of rotation, wherein the associated rotational axis intersects the chord for each profile section in a threading point, which is located in a region between the profile nose and the aerodynamic center of the profile;the adjustment of the blade angle is made passively by the equilibrium occurring during the operation of the wells turbine between the aerodynamic torque, acting on the rotor blades, and the centrifugal torque, wherein the average density of the rotor blade is selected to be less than 2700 kg/m3 and/or the mass distribution within the profile is selected such that the surface centrifugal torque of the rotor blade is reduced relative to a profile made from a solid and/or the surface centrifugal torque of the rotor blades is at least partially balanced by compensatory weights, disposed at a distance from the rotational axis and perpendicular to the chord.

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1. A wells turbine for exploiting a bidirectional flow, the wells turbine comprising: a hub; anda plurality of rotor blades attached to the hub in a rotary fashion using a foot part such that a rotor blade angle is freely variable with respect to a plane of rotation, wherein an associated rotational

1. A wells turbine for exploiting a bidirectional flow, the wells turbine comprising: a hub; anda plurality of rotor blades attached to the hub in a rotary fashion using a foot part such that a rotor blade angle is freely variable with respect to a plane of rotation, wherein an associated rotational axis intersects a chord for each profile section in a threading point, wherein the threading point is located in a region between a profile nose and an aerodynamic center of a profile;wherein the profile of the rotor blades is a drop-shaped profile oriented from the profile nose, wherein the drop-shaped profile is an airfoil producing lift and drag;wherein the wells turbine is set to rotate during operation such that an adjustment of the rotor blade angle is made passively by an equilibrium occurring between an aerodynamic torque and a centrifugal torque acting on the rotor blade, wherein the rotor blade has at least an average density less than 2700 kg/m3, a mass distribution within the profile wherein the surface centrifugal torque of the rotor blade is reduced compared to a profile made of solid material, and a surface centrifugal torque of the rotor blades that is at least partially balanced by compensatory weights, wherein each of the compensatory weights has a center of mass disposed at a distance from the rotational axis in a traverse direction with respect to the chord, wherein the distance from the rotational axis is larger in a perpendicular direction with respect to the chord than in a parallel direction with respect to the chord, wherein the compensatory weights are arranged within or on the foot part in a pair-wise manner to both sides of the chord. 2. The wells turbine in accordance with claim 1, wherein the rotor blades are designed at least in part as a hollow profile. 3. The wells turbine in accordance with claim 2, wherein the hollow profile is at least in part filled by a material having a density which is lower than the density of the material used for the wall of the hollow profile. 4. The wells turbine in accordance with claim 2, wherein the rotor blades are made from a composite material comprising at least one of carbon fibers and fiber glass. 5. The wells turbine in accordance with claim 2, wherein the rotor blade comprises a cavity on the upstream side, being disposed ahead of at least one of the rotational axis and a cavity on the downstream side, disposed rearward of the rotational axis. 6. The wells turbine in accordance with claim 2, wherein the compensatory weights are integrated by at least one of the design and material selection of the foot part. 7. The wells turbine in accordance with claim 2, wherein the foot part is a composite part into which weights are embedded to create the compensatory weights. 8. The wells turbine in accordance with claim 2, wherein separate compensatory weights are arranged within the hub of the wells turbine and are attached to the foot part. 9. The wells turbine in accordance with claim 2, wherein weights are arranged within the profile contour of the rotor blade perpendicularly with respect to the chord and with a transverse distance to the rotational axis. 10. The wells turbine in accordance with claim 2, wherein a stop ridge with a dumbbell-shaped mass distribution, extending perpendicularly to the chord, is arranged in the vicinity of the rotational axis. 11. The wells turbine in accordance with claim 1, wherein the rotor blades are made from a composite material comprising at least one of carbon fibers and fiber glass. 12. The wells turbine in accordance with claim 1, wherein the rotor blade comprises a cavity on the upstream side, being disposed ahead of at least one of the rotational axis and a cavity on the downstream side, disposed rearward of the rotational axis. 13. The wells turbine in accordance with claim 1, wherein the compensatory weights are integrated by at least one of the design and material selection of the foot part. 14. The wells turbine in accordance with claim 1, wherein the foot part is a composite part into which weights are embedded to create the compensatory weights. 15. The wells turbine in accordance with claim 1, wherein separate compensatory weights are arranged within the hub of the wells turbine and are attached to the foot part. 16. The wells turbine in accordance with claim 1, wherein weights are arranged within a profile contour of the rotor blade perpendicularly with respect to the chord and with a transverse distance to the rotational axis. 17. The wells turbine in accordance with claim 1, wherein a stop ridge with a dumbbell-shaped mass distribution, extending perpendicularly to the chord, is arranged in the vicinity of the rotational axis.