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SpaceX rocket landing 'close, but no cigar'

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  • SpaceX rocket landing 'close, but no cigar'

    But STILL pretty durn impressive!

    Source: The Verge

    SpaceX's attempt at landing a rocket on a barge in the Atlantic Ocean ended in failure this morning. After a successful launch, the uncrewed Falcon 9 rocket hit the drone spaceport ship (also known as a barge), but landed too hard, says SpaceX co-founder Elon Musk. The launch, which took place 4:47AM ET, was SpaceX's fifth cargo resupply mission to the International Space Station — the cargo capsule, Dragon, should reach ISS on Monday morning. But the landing was the leg of the mission that was supposed to make history.

    © Copyright Original Source



    Source
    "Neighbor, how long has it been since you’ve had a big, thick, steaming bowl of Wolf Brand Chili?”

  • #2
    I'm curious about one of the embedded tweets in which Musk says "Grid fins worked extremely well from hypersonic velocity to subsonic, but ran out of hydraulic fluid right before landing." Then he states "Upcoming flight already has 50% more hydraulic fluid, so should have plenty of margin for landing attempt next month."

    Hydraulic fluid is normally employed in a closed system, and loss of fluid indicates some type of failure. In such a situation, one would resolve the loss of fluid, not simply add more. Anybody know anything about this?
    "Neighbor, how long has it been since you’ve had a big, thick, steaming bowl of Wolf Brand Chili?”

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    • #3
      Originally posted by Cow Poke View Post
      I'm curious about one of the embedded tweets in which Musk says "Grid fins worked extremely well from hypersonic velocity to subsonic, but ran out of hydraulic fluid right before landing." Then he states "Upcoming flight already has 50% more hydraulic fluid, so should have plenty of margin for landing attempt next month."

      Hydraulic fluid is normally employed in a closed system, and loss of fluid indicates some type of failure. In such a situation, one would resolve the loss of fluid, not simply add more. Anybody know anything about this?
      The SR-71 leaked fluid, until it went into flight due to the heat it generated as it flew, it sealed up as everything begun to heat up. I'm guessing the same thing, the system doesn't quite seal up, until it is in flight and can begin to seal up better. Before that time, it might leak quite a bit.
      "The man from the yacht thought he was the first to find England; I thought I was the first to find Europe. I did try to found a heresy of my own; and when I had put the last touches to it, I discovered that it was orthodoxy."
      GK Chesterton; Orthodoxy

      Comment


      • #4
        Originally posted by lilpixieofterror View Post
        The SR-71 leaked fluid, until it went into flight due to the heat it generated as it flew, it sealed up as everything begun to heat up. I'm guessing the same thing, the system doesn't quite seal up, until it is in flight and can begin to seal up better. Before that time, it might leak quite a bit.
        The SR-71 was designed for sustained higher temperature flight. A spacecraft needs to sustain the vacuum of space. It is not suppose to leak.
        . . . the Gospel of Christ, for it is [the] power of God to salvation to every [one] believing, . . . -- Romans 1:16.

        . . . that Christ died for our sins according to the scriptures; And that he was buried, and that he rose again the third day according to the scriptures: . . . -- 1 Corinthians 15:3, 4.

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        • #5
          Originally posted by 37818 View Post
          The SR-71 was designed for sustained higher temperature flight. A spacecraft needs to sustain the vacuum of space. It is not suppose to leak.
          From what the story seems to imply, it was only briefly in space and spent most of its time, in Earth's atmosphere. I'm just making an educated guess here, but it might depend on sealing up, when it heats up (although you'd have to get an official answer from what they say). Besides, I haven't seen a hydro system yet, that doesn't leak some fluid. If it wasn't leaking, I'd check to see if it was out of fluid.
          "The man from the yacht thought he was the first to find England; I thought I was the first to find Europe. I did try to found a heresy of my own; and when I had put the last touches to it, I discovered that it was orthodoxy."
          GK Chesterton; Orthodoxy

          Comment


          • #6
            Originally posted by Cow Poke View Post
            I'm curious about one of the embedded tweets in which Musk says "Grid fins worked extremely well from hypersonic velocity to subsonic, but ran out of hydraulic fluid right before landing." Then he states "Upcoming flight already has 50% more hydraulic fluid, so should have plenty of margin for landing attempt next month."

            Hydraulic fluid is normally employed in a closed system, and loss of fluid indicates some type of failure. In such a situation, one would resolve the loss of fluid, not simply add more. Anybody know anything about this?
            Open hydraulic system apparently. Pressurised reservoir. No pumps.
            “I think God, in creating man, somewhat overestimated his ability.” ― Oscar Wilde
            “And if there were a God, I think it very unlikely that He would have such an uneasy vanity as to be offended by those who doubt His existence” ― Bertrand Russell
            “not all there” - you know who you are

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            • #7
              Originally posted by lilpixieofterror View Post
              The SR-71 leaked fluid, until it went into flight due to the heat it generated as it flew, it sealed up as everything begun to heat up. I'm guessing the same thing, the system doesn't quite seal up, until it is in flight and can begin to seal up better. Before that time, it might leak quite a bit.
              I'm pretty sure that was fuel, not hydraulic fluid.
              "Neighbor, how long has it been since you’ve had a big, thick, steaming bowl of Wolf Brand Chili?”

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              • #8
                Originally posted by firstfloor View Post
                Open hydraulic system apparently. Pressurised reservoir. No pumps.
                That actually might make sense. You feelin OK?
                "Neighbor, how long has it been since you’ve had a big, thick, steaming bowl of Wolf Brand Chili?”

                Comment


                • #9
                  Originally posted by Cow Poke View Post
                  That actually might make sense. You feelin OK?
                  I am OK, thanks for asking. Remember that you only THINK I talk rubbish, a bit like my better half, in fact. I hope you too are well.
                  About half way down the page:
                  http://space.stackexchange.com/quest...ydraulic-fluid
                  “I think God, in creating man, somewhat overestimated his ability.” ― Oscar Wilde
                  “And if there were a God, I think it very unlikely that He would have such an uneasy vanity as to be offended by those who doubt His existence” ― Bertrand Russell
                  “not all there” - you know who you are

                  Comment


                  • #10
                    Originally posted by firstfloor View Post
                    I am OK, thanks for asking. Remember that you only THINK I talk rubbish, a bit like my better half, in fact. I hope you too are well.
                    About half way down the page:
                    http://space.stackexchange.com/quest...ydraulic-fluid
                    Excellent! Mystery solved.
                    "Neighbor, how long has it been since you’ve had a big, thick, steaming bowl of Wolf Brand Chili?”

                    Comment


                    • #11
                      I think I will build my own spaceship


                      ...Out of bacon. I hope I don't eat it all before I get into orbit.

                      Comment


                      • #12
                        Originally posted by Cow Poke View Post
                        I'm pretty sure that was fuel, not hydraulic fluid.
                        This. And the SR-71 was designed with late 50's technology; I'd like to think that in the intervening time we'd have been able to come up with better ways to clear some of the technological hurdles they faced.
                        Enter the Church and wash away your sins. For here there is a hospital and not a court of law. Do not be ashamed to enter the Church; be ashamed when you sin, but not when you repent. – St. John Chrysostom

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                        • #13
                          Originally posted by One Bad Pig View Post
                          This. And the SR-71 was designed with late 50's technology; I'd like to think that in the intervening time we'd have been able to come up with better ways to clear some of the technological hurdles they faced.
                          Aside from the fact that the enviroactivists would have a hissy that a plane would sit there leaking high octane hydrocarbons. (Seriously, I'm wondering if there hasn't been opposition to 'venting to atmosphere' the almost certainly biohazardic (that's a word, now) hydraulic fluid.)
                          "Neighbor, how long has it been since you’ve had a big, thick, steaming bowl of Wolf Brand Chili?”

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                          • #14
                            Originally posted by Cow Poke View Post
                            Aside from the fact that the enviroactivists would have a hissy that a plane would sit there leaking high octane hydrocarbons. (Seriously, I'm wondering if there hasn't been opposition to 'venting to atmosphere' the almost certainly biohazardic (that's a word, now) hydraulic fluid.)
                            There's filters that you can put on these vents, to try to capture these vapors, but if it is a hydro system, it likely leaks. I'd be worried if it wasn't leaking something.
                            "The man from the yacht thought he was the first to find England; I thought I was the first to find Europe. I did try to found a heresy of my own; and when I had put the last touches to it, I discovered that it was orthodoxy."
                            GK Chesterton; Orthodoxy

                            Comment


                            • #15
                              Originally posted by Cow Poke View Post
                              I'm pretty sure that was fuel, not hydraulic fluid.
                              I was just making a guess. I wasn't sure what they were using.
                              "The man from the yacht thought he was the first to find England; I thought I was the first to find Europe. I did try to found a heresy of my own; and when I had put the last touches to it, I discovered that it was orthodoxy."
                              GK Chesterton; Orthodoxy

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