[Top] [All Lists]

[TowerTalk] 70-ft Debris Radius?

To: <>
Subject: [TowerTalk] 70-ft Debris Radius?
From: (Chris R. Burger)
Date: Fri, 4 Apr 1997 09:46:23 +200
KF6CWX wrote:

> This notion has physically been shown to be false.  I can't remember the 
> exact 
> specification, but its something like 33% of the height of the tower.  In 
> other words, a 50' tower should fail/fall into a circle about 17' in diameter.
> the lay-person.
I would think, intuitively and therefore probably incorrectly, that 
this notion would only apply to towers that are high relative to the 
length.  In other words, I doubt if 50' of Rohn 55 would collapse on 
itself.  200' of Rohn 25 definitely will!

I would think that a reasonable falling radius for squat towers (i.e. 
wide and short) is to take the guy anchor, and draw an arc 
towards the tower, equal to the length of the top guy plus the 
mast above it.  In other words, if your top guy is 100' long, and you 
have 20' of tower/mast above the guy attachment point, I would think 
it unlikely that anything will fall more than 120' from any of the 
guy points.  Drawing a circle around each guy anchor and then finding 
the intersection between the three circles will probably tell you 
where you should not put your deck chair in a storm.

Of course, for free standing towers the considerations are very 

Chris R. Burger

FAQ on WWW:     
Administrative requests:

<Prev in Thread] Current Thread [Next in Thread>