[TowerTalk] Why preload guy lines?

[W0UN -- John Brosnahan]

I have a Loos gauge somewhere, plus a Dillon series
dynamometer.  I always wanted to put some wire rope in
series with some 1x7 EHS so the tensions were equal by
definition and compare the readings.  One other test is
also possible and that is to note any bend in the 1x7
EHS before tensioning and then try the Loos in both
orientations --so the bend would add and then would
subtract if it has any effect and compare the two readings.

So there are a couple of easy tests to do.  Just that
I am not going to do them any time soon.  Too many
other things going on at the moment.  And it is a
bit of a moot point for me since I use the Dillon
series dynamometer for everything and I just bought
the Loos gauge so K7LXC could buy a newspaper
and a cup of coffee from his profit!

73--John  W0UN





>Right, it's a measure of the force required to bend a wire
>under a particular tension.
>
>So there are two components of the 'resistance': that caused
>by the tension, and that caused by the wire stiffness.
>
>The wire stiffness remains constant. At low tensions, it
>dominates. As the tension increases, becomes a smaller and
>smaller percentage of the total. The question is what
>percentage of the total at common (10%) pre-tensions?
>
>I don't own the Loos gauge, but gather that:
>
>1) The supplied chart or table does not give alternate
>calibrations for different guy material.
>
>2) The chart is calibrated for flexible cable (wire rope).
>
>The larger gages I own have alternate calibrations, but
>only for the overlapping guy size range (1/2" to 3/4")
>where EHS is available in both 1x7 and 1x19 configurations.
>
>I would think it might be useful for someone to actually
>calibrate the Loos for 3/16" EHS at 400 lbs, and 1/4" EHS
>at 600 lbs, and take away any doubt. I may pick one up
>from Champion and do it. I should have one of these in my
>kit anyway.
>
>73,
>Steve K8LX
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