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Re: [TowerTalk] Tower in Tree

To: <>
Subject: Re: [TowerTalk] Tower in Tree
From: "W7CE" <>
Date: Wed, 9 May 2007 08:50:36 -0700
List-post: <>
> >Doug Fir is the strongest North American softwood
> No kidding!   I just looked it up on and the flexural yield
> strength is listed at 8100psi!
> The elastic modulus is about a thirtieth that of steel (1000ksi vs.
> 30,000ksi) , but the cross section of the tree is huge compared to
> Rohn 25G ...

Exactly!  The tree is much stronger and more flexible than a steel tower.  I 
can't begin to estimate the wind load that the branches present, but it is 
probably measured in 100's of sq. ft.

Clay  W7CE 


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