Comments by "SeanBZA" (@SeanBZA) on "Scott Manley" channel.

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  23.  @solandri69  Most likely poor maintenance, they painted over the cables time and again, and you will probably find they trapped water in the cable, which led to corrosion cells and failure. The cables likely were made from hot dipped galvanised strands, which eventually had the zinc erode off, exposing enough steel to make galvanic cells inside the cable. I would say the design flaw was not in having enough cables there, so that you could safely remove half of them every 5 years per tower to replace with a spare set, and those removed went off to be unwound, serviced and inspected, and then greased, reassembled and recoated for the next tower rope cycle. 10 years would be plenty of time to find weak strands and remove them. Yes you would probably be splicing in repair sections every time, making the cable thicker in parts, but they would still be more than capable with that. That the initial cable failed at the poured zinc plug indicates it was very likely badly corroded inside from neglect, as that section is the one most protected cathodically, but had plenty of water ingress to corrode the inner. Likely all the lanolin applied during manufacture was long gone, and had never been replaced. Not that those were highly stressed cables, only a static load, no real dynamic force and no real bending. There are mine lift cables that are kilometers long, used dozens of times daily, that are probably older than those, but they also undergo regular inspection and lubrication cycles to keep them in operation. There are plenty that the cable weighs more than the entire telescope aerial steel structure, just in the cable alone.
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