Discussion
Which convention does a wind barb use for a full feather?
Answer: A
A full feather represents ten knots, a half feather five and a solid pennant fifty, so a barb with a pennant and two full feathers indicates seventy knots. The shaft points in the direction from which the wind is blowing. The convention survives from an era when knots were universal in meteorology and remains in use for aviation.
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