Product information "Starting threshold - Wind Vane"
Wind tunnel measurements of starting threshold of wind vanes are performed in accordance to the ASTM D 5366 – 96. The starting threshold is determined by measuring the lowest speed at which the vane is moving from a 10° deflection to a position within 1° distance from the vane equilibrium state. The wind vane is mounted with a tilt angle of 0 deg. During the measurements, the tunnel speed is slowly increased from 0 m/s upwards. This procedure is performed several times for a 10° deflection in both directions of the equilibrium position. Minimal flow speed is approximately 0.2 m/s.
