[TowerTalk] Fall Zone

[Gene Smar]

TT:

     I have a Trylon T-500-64 in my backyard.  There are two different gauges of steel that make up the legs in that tower:  the thicker gauge is used in the first four sections, up to 32 feet, and the thinner steel is used for the upper four sections.  Logic would let you conclude that the wind pressure would likely cause the tower to fail somewhere along the thinner steel.

     I also ran Trylon's tower loading software on this model, to include my planned antennas and mast.  The software showed that, with loading from a 90 mph wind, the safety margin reached zero at the junction of the thin and thick leg steel, or at the 32 foot level.  There was safety margin left on the remaining seven sections.

     The Trylon's will bend in half under heavy winds.


73 de
Gene Smar  AD3F


-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of Jim Thomson
Sent: Monday, July 08, 2019 12:35 PM
To: towertalk at contesting.com
Subject: [TowerTalk] Fall Zone

Date: Mon, 8 Jul 2019 11:20:31 -0400 (EDT)
From: Wilson  Lamb <infomet at embarqmail.com>
To: undefined <towertalk at contesting.com>
Subject: [TowerTalk] Fall Zone

<I wouldn't want a neighbor's tower/Yagi looming over my backyard...and I love towers!
<The fall zone idea seems like simple good manners.
<I have been loosely involved in dropping 200' BC towers, dropped by cutting the rods at one guy anchor, thus losing all guys on that side.
<They fell absolutely full length, with a few sections not even bent!  
<I think a foundation failure (soil, bolt, gin pole) would drop a crankup to full length.
<Is there any experience available on this?
<WL

##  per software,  Trylon self support  towers will  fail  at the junction  of the 4th  and  5th  section..... 40’  above ground. 
UST  designs a weak  spot.... which  is  midway  up  the  3rd  section...  46.5  feet  above ground.   

##  Never seen  a pix  of  either  tower folded  over... as  depicted  above.    40  ft...and  46.5 ft.   So dont  know if  their
design theory  works....or not. 

Jim   VE7RF 


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