You'll always have sag... less sag, with more tension...
Here is a calculator, with both ends at the same elevation. Using 1/2"
Phillystran for a 350' span, you have something like 23' of sag with a 100#
tension in the cable. You want very little sag? Better be prepared to have
significant lateral stress, and make sure your anchors and guying system is
designed for it. I didn't look any further for a calculator which would
allow uneven end heights...
https://www.spaceagecontrol.com/calccabl.htm?F=100&a=350&q=0.15&g=32.18503937&Submit+Button=Calculate
regards,
Dave N3AC
On Wed, Apr 21, 2021 at 12:48 PM <john@kk9a.com> wrote:
> I am not a mechanical engineer but I am guessing that if he uses
> Phillystran and allows for perhaps 10' of sag there is not a lot of
> tension on the cable. Rope may be worse if it gets wet and heavier.
>
> John KK9A
>
>
> >
> > On 4/21/2021 9:04 AM, Steve K8LX wrote:
> >> Rather than be tempted to use high enough tension where turnbuckles
> >> are needed, let it sag a little, give up a few feet of height -
> >> your tower guy systems will appreciate it.
> >>
> >> -Steve K8LX
>
>
>
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