use PRECESSION instead. As we know, when a torque is applied to a gyroscope, the gyroscope precesses PERPENDICULAR to the applied torque. This can be used to turn the axis of rotation without slowing down the aeroturbine.

In the classical method, a TAIL VANE applies torque in the plan of the Earth's surface. If the turbine is pointing slightly to the right of the wind, the vane is on the left side and receives a torque from the wind which pushes it clockwise.

Instead, use the vane to apply a torque PERPENDICULAR to the desired direction of precession. The vane should not be connected directly to the axis of rotation. Instead, it should be connected with the base that supports the axis in such a way that a push of the vane to the right applies a torque that tries to move the axis UPWARD, and a push to the left tries to push the axis DOWNWARD. Then the gyroscope effect will cause precession of the axis of rotation in the desired direction.