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Re: Christmas Trees :)

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Even though the tree may be 90% air, it will look to the wind the same
way it looks to golf balls - solid.  Seriously, you will not be overly
conservative if you assume the tree is a solid triangle, and calculate
the moment accordingly.  

This can be easily demonstrated by standing on the lee side of a lone
pine when the wind is blowing - it's dead calm there, indicating that
the tree is deflecting and/or absorbing all the wind energy.