[Towertalk] Inquiry - Tower Collapse/Fall/Radius Zone

[Guy Olinger, K2AV]

A tornado is trees being ripped UP. It breaks at the point
accumulating most aerodynamic drag and least able to support the
weight of the root ball.

----- Original Message -----
From: "Bill Coleman" <aa4lr@arrl.net>
To: "Dan Evans" <n9rla@yahoo.com>; <TOWERTALK@contesting.com>;
<n4kg@juno.com>
Sent: Friday, April 26, 2002 1:42 PM
Subject: Re: [Towertalk] Inquiry - Tower Collapse/Fall/Radius Zone


> On 4/9/02 9:29 AM, Dan Evans at n9rla@yahoo.com wrote:
>
> >The annoying part of that is, every tree I've ever seen fall, fell
it's full
> >height.  But no one is restricting the height of trees.
>
> Actually, when a tornado went through my neighborhood in 1988, the
fallen
> trees almost never fell their full height.
>
> Instead, they were snapped off at about 12-18 feet off the ground.
>
> The one incident of a tree falling out to its full height was a
> neighbor's tree that leaned over to one side after many, many days
of
> rain waterlogged the ground, and caused the roots to pull out. That
one
> failed about 2-3 feet BELOW the ground.
>
> I don't think below ground failures are likely for proper tower
> installations. Failures 10-20 feet off the ground are more likely.
Towers
> (and trees!) are awfully strong right next to the ground.
>
>
>
> Bill Coleman, AA4LR, PP-ASEL        Mail: aa4lr@arrl.net
> Quote: "Not within a thousand years will man ever fly!"
>             -- Wilbur Wright, 1901
>
> _______________________________________________
> Towertalk mailing list
> Towertalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>