[TowerTalk] VOA tower demolition in HD

[K7LXC at aol.com]

>Probably many of you have already seen this, but this is a HD  version 
with more views of the tower demolition. 
>I have one question.  I've always heard that when a really tall tower 
comes down, it basically  collapses onto itself and doesn't fall as one solid 
unit extending out the  height of the tower. Watching this, I see many of the 
towers didn't collapse  into one small area but went down as a full unit.

>  There was a  NJ engineering firm study done 25-30 years ago on tower 
failures.   It  was mostly about commercial towers more than 200' high.  They 
all fell  within 30% of their height.   I think they were mostly guyed  
towers.  You may find that K1VR referenced it in his book on antenna zoning  
issues.   I assume there must be something done more  recently.
 
    This is known as the Gunnar Olsen study. A copy of  it is at 
http://www.championradio.com/Gunnar-Olsen.pdf 
 
Cheers,
Steve      K7LXC
TOWER TECH
and 
championradio.com