| 摘要 |
An airflow direction indicator in accordance with the invention is intended for sailboards, in which the front portion of the sail includes a tunnel which is slipped onto the mast and is rotatable relative thereto when varying the sheeting and curvature of the sail. In accordance with the invention, the indicator is supported by a fitting to be attached to the forward portion of the tunnel, this fitting carrying a mounting shaft forming an acute angle to the longitudinal direction of the tunnel and mast, and carrying a wind vane which is biased to return to a substantially vertical position adjacent the tunnel with the main longitudinal direction of the vane substantially parallel with the longitudinal direction of the fitting and tunnel, respectively, when the fitting is held in a vertical position, whereby the vane will indicate changes in the direction of the flow of air around the forward edge of the sail.
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