I am not an engineer
, but beware of the loads placed on two attachment points, when the pull will be in the middle of those points.
For example, in building rock / ice climbing anchors, you can have a 100 lb person hanging on 1 anchor
bolt or screw, which will exert about 100 lbs on that anchor
bolt. (juts hanging there, static load not dynamic load falling, which would be much greater)
If you place a 2nd anchor bolt and then attach the climber, using rope
, to both anchors, the angle of the rope
that leads to the climber is key. You have what is known as the death triangle, and if the anchors are far apart, and the rope short to the climber this will create a large pull inwards on each anchor (towards the other anchor) as well as down towards the climber.
You can end up with nearly 200 lbs exerted on each anchor from a 100 lb climber, when you only had 100 lbs on the single
If a longer rope is used, which reduces the angle (creating a long, thinner triangle, instead of a short, wide triangle) then this force is reduced, and you end up with redundancy (2 anchors vs 1) and less force on each anchor.
Why did I write all of that? Sound like you would have the upside down version of that, where the boom pulls upwards on a fairly tight (bad angle) spectra line, which would then exert likley twice the force of the upward pull on each anchor point.
The old pipe traveller woudl have likely not passed on the same forces to the anchor points, as it would have pulled more upwards I think. The spectra will pull up and much more inwards towards the other side's anchor point. I see the need for large backing plates
I would personally consider buying
or having a simple replacement one made.