Thread: RFB and Wind
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Old 12-16-2011, 06:57 PM
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Maj. Numbskully Maj. Numbskully is offline
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A wind sock should orient itself according to the wind direction due to a 3-knot (5.6 km/h; 3.5 mph) wind speed. In general, the wind sock side seams should be at the 9 and 3 o'clock positions.

The taper of the fabric wind sock from the throat to the trailing end must be designed to cause the wind sock to fully extend when exposed to a wind of 15 knots (28 km/hr or 17 mph). FAA Advisory Circular 150/5345-27D also provides specifications for externally lighted, internally lighted, and unlighted wind socks.
http://www.brighthub.com/environment...les/88593.aspx
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