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The end of the line for the Arecibo radio telescope
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BravoV:

--- Quote from: coppercone2 on November 20, 2020, 10:49:37 pm ---is that thing made of aluminum?

I wonder why they can't fix it with careful welding and epoxy (reinforce with a epoxied frame then weld it up after its more secure. You would think they could put jacks (cranes) under it and weld it up and not let china have RF astronomy dominance.

--- End quote ---

C'mon ...  :palm:

Here an idea, why not turn the whole metal structures into bulk metal scraps, sell it to the Chinese to feed your fellow poor Puerto Ricans that have been abandoned by the current POTUS.  :-DD

Here, few more informational propaganda videos to enlighten you ...  >:D




Btw, she used Fluke DMM, at least something you can be proud of.  >:D

coppercone2:

--- Quote from: BravoV on November 21, 2020, 04:29:33 am ---
--- Quote from: coppercone2 on November 20, 2020, 10:49:37 pm ---is that thing made of aluminum?

I wonder why they can't fix it with careful welding and epoxy (reinforce with a epoxied frame then weld it up after its more secure. You would think they could put jacks (cranes) under it and weld it up and not let china have RF astronomy dominance.

--- End quote ---

C'mon ...  :palm:

Here an idea, why not turn the whole metal structures into bulk metal scraps, sell it to the Chinese to feed your fellow poor Puerto Ricans that have been abandoned by the current POTUS.  :-DD

Here, few more informational propaganda videos to enlighten you ...  >:D




Btw, she used Fluke DMM, at least something you can be proud of.  >:D



--- End quote ---

yea if you climb up there you can stabilize the structure with a glue scaffolding before you start grinding it and dressing welds etc. It probobly got messed up when the line tore out and hundreds of tons started to shake. I expect lots of deformation, damaged bolts and some tearing. Not to mention it probobly draws lots of rich smart people with lots of disposable income to a country thats not doing so well. You don't really want (especially high power RF signals radar experts *cough* stealth detection *cough*) those people going to china. That thing did alot more for the world then just generating some data for the duration of its existence. CCP seti is more like search for 'capitalist objects of party interest'.
magic:
It's the suspended antenna platform which is in danger of falling down if the remaining cable snaps. It weights a few hundred tons and hangs 150m above ground and still tens of meters above surrounding hills, so not that easy to give it additional support. And nobody has the balls to climb it and replace the failed cables. Not sure why they couldn't do it from a helicopter or something - maybe the cables are too heavy to lift from the ground without using the structure itself for support.

I wonder how they built it in the first place.
coppercone2:
given what they say about the rope slipping out, it sounds like a bad crimp job or bolts not being tightened. The rope should have been tied on the other side, I guess they tried to make it 'neat' and cut the remaining off after it was crimped into place. Then the knot should have wedged into the crimp as a secondary protection method.

I guess this is the way to do it, you don't really see knots on suspension bridges either. But those HAVE to be aesthetically pleasing. When I see a project of this magnitude fail by a 'slip' it really makes me wonder. I never liked rope suspensions, the interface between the solid and the rope always seemed suspect.
station240:

--- Quote from: magic on November 21, 2020, 07:56:17 am ---It's the suspended antenna platform which is in danger of falling down if the remaining cable snaps. It weights a few hundred tons and hangs 150m above ground and still tens of meters above surrounding hills, so not that easy to give it additional support. And nobody has the balls to climb it and replace the failed cables. Not sure why they couldn't do it from a helicopter or something - maybe the cables are too heavy to lift from the ground without using the structure itself for support.

I wonder how they built it in the first place.

--- End quote ---

The suspended mass is 900 tons.
The main problem is any replacement cables cannot be installed without putting people onto the structure, or in the path of cables should they break.
ALL the cables have been found to be weaker than expected.

https://edition.cnn.com/2020/11/19/world/arecibo-telescope-decommission-damage-scn-trnd/index.html
"After the break on November 6, engineers inspected the rest of the cables and discovered new breaks as well as slippage from some of the sockets on the towers. Multiple engineering companies reviewed the damage. They determined that the telescope could collapse because it is "in danger of catastrophic failure" and the cables are weaker than expected."

"While no direct cause for the breaks has been identified, corrosion is suspected as the main issue. The observatory has withstood hurricanes, earthquakes and tropical storms over the years."

"Even if engineers could safely fix all the damage and add cables to support the telescope, it would likely have stability issues in the future."
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