Wind socks speed indication

something I didn’t know about windsocks. the white/red colored bands indicate the speed:
Each alternating red and white stripe equals 3 knots of wind speed. So wind speed in this image is about 10 knots.

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Yes, and the size/shape of the wind sock determines what it’s max indicated speed is. My brother would always check his flight charts to know what a windsock at a particular airport is indicating.

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