Arecibo is kaput

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • #16
    Originally posted by Scott Dyer HPN/NY View Post

    I did mine at the drug store...
    I did mine at a corner grocery. Once, I was standing by the tester, dead tube in hand, and got a clerk's attention.

    "Kin I help you?"
    "I need a tube,"
    "A tubeuh whut?|"
    Bacon is the answer. I forgot the question.

    Comment


    • #17
      Too bad you weren't in a band and playing tuba!

      Comment


      • #18
        Video of the collapse. https://twitter.com/i/status/1334536573636009987

        Comment


        • #19
          Originally posted by Ralph Jones View Post
          WOW! Talk about being in the right place at the right time. I think this is going down with the Tacoma Narrows Bridge for classroom videos.

          BTW, one of the YouTube channels mentioned there was a small earthquake around this time - it's likely that was the trigger for the event.

          Comment


          • #20
            Longer video here: https://arstechnica.com/science/2020...ables-snapped/

            Interesting comment by a knowable person suggesting that the science/$ isn't encouraging for rebuilding.

            Comment


            • #21
              Originally posted by Russell Holton View Post
              suggesting that the science/$ isn't encouraging for rebuilding.
              This is crazy. I saw an estimate of $350 million to rebuild/replace.

              That is about 3 F-35s.

              Comment


              • #22
                Originally posted by Terry Carraway View Post

                This is crazy. I saw an estimate of $350 million to rebuild/replace.

                That is about 3 F-35s.
                We're probably going to save that much on presidential travel in 2021, so funding found!

                Comment


                • #23
                  Originally posted by Terry Carraway View Post
                  That is about 3 F-35s.
                  Maybe. I wonder what the real "variable" cost per airplane is. If you try to cut the program by 3 jets, the enormous fixed costs for development get spread across the remaining airplanes such that the cost savings are minimal.

                  Anyway, to quote a section of the comment I was referring too:
                  So as always it comes down to choices. If congress were to say here is new money to rebuild Arecibo in addition to the other telescopes you want to build; scientists would jump up and down. There is really cool science Arecibo2 can do. But if congress were to repurpose other science money to rebuild Arecibo instead of the other telescopes we are currently designing and building, it would be a setback. On a science/$ basis a rebuilt Arecibo is not very competitive. This is really down to the cost of receivers and digitizers falling so much that arrays of equivalent cost have greater science range.
                  I'll note that with the current economic situation, this isn't a good time to ask for niceties.

                  Comment


                  • #24
                    Good analysis of the failure from multiple angles, including a drone about ten feet away from the cables which broke first. Too bad the drone didn’t record the sound, it would have been deafening that close.

                    https://www.youtube.com/watch?v=59WQIRvezzI
                    Tom Tyson-A&P

                    Pilots without Mechanics are just Pedestrians with fancy watches . . .
                    ( . . . and Mechanics without Pilots are Unemployed.)

                    Comment


                    • #25
                      Originally posted by Tom Tyson View Post
                      Good analysis of the failure from multiple angles, including a drone about ten feet away from the cables which broke first. Too bad the drone didn’t record the sound, it would have been deafening that close.

                      https://www.youtube.com/watch?v=59WQIRvezzI
                      Ah, Scott Manley. He was the one that mentioned there was a earthquake at that time that was likely a trigger. See 1:44 in this video: https://www.youtube.com/watch?v=vchDbyIRP44

                      Comment


                      • #26
                        Originally posted by Russell Holton View Post
                        Maybe. I wonder what the real "variable" cost per airplane is. If you try to cut the program by 3 jets, the enormous fixed costs for development get spread across the remaining airplanes such that the cost savings are minimal.
                        OK, cut 4 planes.

                        Comment


                        • #27
                          Originally posted by Terry Carraway View Post
                          OK, cut 4 planes.
                          I don't have a basis, but I'm thinking the fixed (development) costs dwarfs the variable costs. Perhaps each airplane is only 10s of $M, not 100s of M.

                          Comment


                          • #28
                            The F-35A unit price, including aircraft and engine, is now $77.9 million in Lot 14.
                            OK, so we need to cut 4.5 aircraft to rebuild a new Arecibo.

                            They have already built over 595 aircraft.

                            Comment


                            • #29
                              The Practical Engineering channel just put out an interesting video.



                              Two things I learned: it was originally built as a DoD cold war project. It also seems to have had a rather low safety factor in it's calculations.

                              Comment


                              • #30
                                Originally posted by Russell Holton View Post
                                The Practical Engineering channel just put out an interesting video.



                                Two things I learned: it was originally built as a DoD cold war project. It also seems to have had a rather low safety factor in it's calculations.
                                Probably why it only lasted 57 years.

                                Comment

                                Working...
                                X