Abstract
Abstract Double-fin vanes which have their fins at angles >10° with the vane axis may refuse to point into the wind, having instead two symmetric equilibrium positions at angles up to 16° with respect to the wind direction. The dependence of this effect upon vane geometry is investigated in the wind tunnel; this leads to the construction of a slow, well-damped aerodrome wind vane. Tests under natural wind conditions show that when two vanes are used, which are equally well damped but have different natural wavelengths, the difference in measured azimuth variance may attain a factor of 2 for stable stratification and weak winds. Experimental verification is obtained of a suggestion by Protopopov to salvage bad wind vanes by employing them in pairs. The practical usefulness of vane improvement by the investigated techniques and by means of frontal fins, mechanical dampers, etc., is discussed.
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