I've been reluctant to continue this guying thread...
but this really is slightly different...it's hbx/hbdx related:
chuck wrote:
Yes Dave, *I* was one of those idiots who attempted using an HDBX48 tower
to hold up a KT34XA and a 14 element 2 meter beam atop that!!
Unfortunately, I can no longer find any of the photos of that disaster of 7
years ago, it is still etched firmly in my memory! DON'T DO IT! I was
lucky..... nobody was killed or injured! And yes, I even had mine
guyed!!
Dave wrote:
>I hope that everyone knows the BX series is only designed to hold a beam
>with a boom of NO longer than 10 feet. Guyed or unguyed.
>
>There have been horror stories of those who tried longer beams such as the
>TH7 or KT34XA or even quads bigger than 3 elements. Longer booms stress
>the bolts holding the top section so that the metal splits.
>I think some of this is recalled in the towertalk archives.
I will add:
I saw an hbdx48 come apart from torsional loading from a KT34A...a 16'
boom. It was guyed at 48', and around 24'. The top section torqued,
tore, crumpled, and crushed the second section down. From the mid-point
down, the tower was bent, but not crushed.
And that ended thoughts of a small lpda with a 14' boom on that tower.
For the record, I don't think the guying hurt or caused the failure...
just that the tower wasn't very strong to begin with.
N2EA
jimjarvis@ieee.org
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