On Thu, 02 Jul 98 19:22:31 PDT "Ron Youvan" <ka4inm@gte.net> writes:
>
>T A RUSSELL said:
>snip
>I don't believe a few inches of pullout will allow a tower to fall.
>
>W1EVT told me he decided to install insulators in one
>of his 140 ft Rohn 25 towers to make a 160M elevated GP.
>They had to loosen the upper guys to where they were
>almost hanging along the tower before they could jack it up.
>
>de N4KG
>snip
>
> Did he slack ONE cable until there was little or no tension, then
>move tho the next one?
>
My understanding was they slackened them equally
at each level. N4KG
>If one cable loosens and the other two are maintaining tension, they
>will TRY to pull the tower over.
YES, but NOT to the point of failure. I had 2 trees fall
on one of my guys after a tornado. The top of the 130
ft tower was arched over 1 ft, but the tower did NOT fail.
Once the trees were removed, the tower straightened
right up. I had to retighten the guys. I assumed they
stretched. N4KG
>If ONE (or two) legs "KINK" she* will come down.
Not likely. As in the above case, they are more likely to
arch. N4KG
>
>With out any wind, a tower will stand with NO guy cables, without any
>problems. (assuming it is plum)
>Guy cables add loading to the tower, they pull down on the tower,
>pretty much their weight + the tension.
>
Understand. Agree.
>The higher the tension the greater the chance of tower failure.
>There is a correct tension, any MORE IS BAD!
>
A few inches stretch in one guy point is not
likely to put a permanent bend in the tower.
Tower is a lot more flexible than you imagine.
N4KG
>* anything with speed, beauty, style or grace is often refered to in
>the feminen gender!
>
> 73 de Ron ka4inm@qsl.net Best Regards
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