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@contesting.com] On Behalf Of Jim
Thomson
Sent: Monday, July 08, 2019 12:35 PM
To: towertalk@contesting.com
Subject: [TowerTalk] Fall Zone
Date: Mon, 8 Jul 2019 11:20:31 -0400 (EDT)
From: Wilson Lamb <infomet@embarqmail.com>
To: undefined <towertalk@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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