the invention relates to a wind vane to move along the axis of aambient air flow. the vane is provided with means (i1, i2, e1, e2).of differential pressure is representative of the impactaerodynamic (. alpha.) of the vane (1). according to the invention, the making ofdifferential pressure is balanced when the vane (1) is orientedof course, in the axis of the passage (12).
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