[TowerTalk] Rohn 25;Tower flex

[Jim Jones]

He was changing lamps during the world series?? 

Pat Barthelow wrote:

> 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   aae6g at hotmail.com
>
>
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