|Subject:||[TowerTalk] Rohn 25;Tower flex|
|From:||"Pat Barthelow" <firstname.lastname@example.org>|
|Date:||Sat, 29 Jan 2005 09:30:36 -0800|
Bear in mind also that moving isn't breaking. A tower can potentially flex
a pretty substantial (and scary, if you're up on top) distance without failing (and, in fact, that flexing is essential to avoid stress concentrations).
I can attest to the 'scary' sensation of ANY movement of a pole, or tower, to those on top. While strapped off, on top of a very sturdy 65 ft wooden power pole, with a pulley/halyard tensioned dipole at the top, a ground crew assistant was told to pull her up, tight, which he did... WHOAAAAA...the 50 pounds or so of pull bent the pole what seemed to me at the time, like 8 feet..real scary.. When I did the same thing on the ground, watching the top of the pole, what felt like 8 ft swinig, was really about 4 inches...Then there is the true story about the guy changing the lamps at Candlestick park when the 1989 earthquqke happened. Free standing lighting poles probably 150' tall, He was interviewed shortly after the quake, and he was clearly shook up at his experience, hanging on through the earthquake...cant imangine what that woulld have been like...
73, de Pat AA6EG email@example.com
See: http://www.mscomputer.com 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.
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