| 摘要 |
An angle of attack indicating device for use in indicating the sail trim of a sail boat or the angle of attack of an airfoil in order that the sail or the airfoil may be optimized. The device of the present invention employs wind operated sensing vanes coupled to associated indicator vanes mounted on either side of the leading edge of an airfoil such as a sail or wing, which are employed to sense the airflow differential on the opposite sides of the airfoil. By visual indication of the relative positions of the wind responsive vane and the indicating vane appropriate adjustment may be made to maintain the proper attack angle.
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