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The flapping of the blades compensates the dissymmetry

of the lift created by the blades. The blade going in the same direction as the relative wind has more speed , therefore more lift than the one going against the wind.

As the blades are on hinges the blade which has more lift can "flapp" upwards resulting in loss of surface ( as lift is also dependent of the surface) and thus balancing the lift on the rotor disk.

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