[Top] [All Lists]

[TowerTalk] Tower "DROP ZONE" or "DROP RADIUS" for Rohn 25G &

Subject: [TowerTalk] Tower "DROP ZONE" or "DROP RADIUS" for Rohn 25G &
Date: Thu, 13 Jan 2005 19:50:24 -0500
List-post: <>
From: "John WA2GO" <>
Subject: [TowerTalk] Tower "DROP ZONE" or "DROP RADIUS" for Rohn 25G &
   Trylon Titan?
Message-ID: <BAY23-F20BFB0A611BD06BFF03C3AA58A0@phx.gbl>
Content-Type: text/plain; format=flowed

> The Building Inspector is requiring my engineering drawings to specify what 
he is calling the "drop zone" or "drop radius" of the tower.  >He wants to 
see what is the radius of the circle it will all land inside when it all 
comes crashing down.  (perish the thought!)

> I couldn't find this figure in the Rohn catalog anywhere. The one engineer I 
talked to didn't seem to know about it either.

For the self-supporters just use their length; i.e. falling like a tree. It's 
not entirely accurate since most towers fail up the tower and generally not at 
the base but he just wants to know the fall radius.

For guyed towers they generally fall in circle approximately 1/3 of their 
height. There is a study cirulating that documents a bunch of guyed commercial 
tower failures and adds creedence to this. The reason they don't fall in a 
larger circle is because they're constrained by the remaining guy wires and 
fall in a big heap. I've got a copy of the study if you're interested. (I can't 
remember the guy's name that did it.)

Steve    K7LXC
Professional tower services for commercial and amateur

See:  for "Self Supporting Towers", "Wireless Weather 
Stations", and lot's more.  Call Toll Free, 1-800-333-9041 with any questions 
and ask for Sherman, W2FLA.

TowerTalk mailing list

<Prev in Thread] Current Thread [Next in Thread>
  • [TowerTalk] Tower "DROP ZONE" or "DROP RADIUS" for Rohn 25G &, K7LXC <=