In article ,
fred writes:
Hi group, what wind speed is indicated by a wind vector with 3 full feathers
and one half feather.

That would be Force 7 on the Beaufort scale, so just below Gale Force 8.
Each full feather represents 2 and a half feather represents 1.
--
John Hall
"If you haven't got anything nice to say about anybody, come
sit next to me."
Alice Roosevelt Longworth (1884-1980)