Pivoting wind direction vane - has three sections with central pivot and two demi-geodesic members

摘要

The wind vane has three sections which move on a central section to which, on each end, is placed a demi-geode to cover the surface. During a turn to the right, the wind penetrates the demi-geode on the left. When aligned to the wind, the latter penetrates between the two demi-geodes, giving a rectilinear trajectory. During turbulence, the wind speed does not cause instability in the vane.