SpaceX Falcon 9 historic landing thread (1st landing attempt & most recent missions)

Discussion in 'The Watering Hole' started by georgegassaway, Dec 11, 2014.

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  1. Jan 16, 2020 #3,691

    boatgeek

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    I 100% forgot that the NS is intended to separate not too long after MECO. According to a flight test video here, it separates at ~1760 MPH and 240K feet in normal flight. So the top of the booster is obviously designed for supersonic flight without the capsule, though in very thin air. Incidentally, Max Q for NS is subsonic, at 565 mph at 23K feet.
     
  2. Jan 16, 2020 #3,692

    Mushtang

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    Yep, the "very thin air" you mentioned is the key difference. New Shepard separated in that video at 240,000 feet up where Dragon and Falcon 9 will separate on this test around 65,000 feet. Air is much thicker, stresses will be much higher, fireball will be.... ?
     
  3. Jan 18, 2020 #3,693

    Marc_G

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    Looks like it is now planned for Sunday.
     
  4. Jan 19, 2020 #3,694

    georgegassaway

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    [​IMG]
    And if not Sunday, them Monday, same timeframe.

    Webcast:
     
  5. Jan 19, 2020 #3,695

    Marc_G

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    Now targeting 10 am this morning
     
  6. Jan 19, 2020 #3,696

    Peartree

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    Of course. Because I'll be at work.
     
  7. Jan 19, 2020 #3,697

    Sooner Boomer

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    It's about T -20. NASA coverage is live:


    No SpaceX coverage yet.
     
  8. Jan 19, 2020 #3,698

    pyrobob

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    Managed to tune in about 45s into launch. Very cool.
     
  9. Jan 19, 2020 #3,699

    les

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    Success!
    And nice CATO of the booster.........
     
  10. Jan 19, 2020 #3,700

    Huxter

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    Now THAT was a CATO! F***** SPECTACULAR!
     
  11. Jan 19, 2020 #3,701

    Marc_G

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    Will be interested to hear if they blew the booster or it blew naturally. My guess was they blew it.
     
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  12. Jan 19, 2020 #3,702

    Mushtang

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    Fireball!!!
     
  13. Jan 19, 2020 #3,703

    BEC

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    According to the commentary they expected it to start to tumble and then break up under aerodynamic forces. They were not planning to use the FTS. And it certainly looked like it wasn’t necessary.
     
  14. Jan 19, 2020 #3,704

    0011001100

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    If you watch with a large screen carefully the booster begins to bend about 1/3 of the way from the top before exploding.
     
  15. Jan 19, 2020 #3,705

    OverTheTop

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    Is that around the S1-S2 interstage, or lower?
     
  16. Jan 19, 2020 #3,706

    0011001100

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    Below the interstage, about where the top of the tank would be.
     
  17. Jan 19, 2020 #3,707

    Mushtang

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    Whenever I read about the upcoming Dragon Abort Test everything said it was going to fire at Max-Q. This morning Max-Q happened about 60 seconds in, and the Dragon didn't pull away until about 30 seconds later, and after they'd throttled back up. It seems like the test was at a much lower pressure by that time.

    So I wonder if the abort signal was sent late for some reason, or if maybe the pre-flight articles reported on bad information given out before hand and the test was always planned for that far after Max-Q?
     
  18. Jan 19, 2020 #3,708

    MichaelRapp

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  19. Jan 19, 2020 #3,709

    mpitfield

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    Scott Manley did a decent video on the event.

     
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  20. Jan 19, 2020 #3,710

    MichaelRapp

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    "Of course, portrait video is a crime against humanity, so I am going to rotate this 90 degrees...." lol

    I only discovered Scott's videos just yesterday when I was researching background for this launch. I like his stuff!
     
  21. Jan 20, 2020 #3,711

    ThirstyBarbarian

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    As always, he did a great job with this video.
     
  22. Jan 20, 2020 #3,712

    Chad

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    is it me or was the water deluge system late to turn on at launch? The motors were completely lit and throttled up before they came on 100%. My understanding is the water protects the rocket from sound waves echoing off the pad just as much as it protects the pad from the exhaust.
     
  23. Jan 20, 2020 #3,713

    cvanc

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    I watched it again and it seems you are correct; the water system had a different timing than past launches. It was much later in the ignition sequence and had a strong 'startup surge' that I don't recall seeing before?

    ...And yeah it really looked like it started quite a bit later than would be ideal.
     
  24. Jan 20, 2020 #3,714

    dhbarr

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    This would be a great test to run on a booster you weren't planning on getting back.
     
  25. Jan 20, 2020 #3,715

    OverTheTop

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    Maybe they turned the deluge on later so there was less steam blowback and the venturi effect kicked in earlier. This would potentially be easier on the tail end of the rocket.
     
  26. Jan 29, 2020 #3,716

    SpaceManMat

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    Looked like a really heavy landing to me.
     
  27. Jan 29, 2020 #3,717

    swfa

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    I noticed that as well. It looked like it leveled off above the deck, and then dropped the last bit.
     
  28. Jan 29, 2020 #3,718

    mpitfield

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    T +38:43, what is up with the sudden velocity change of stage two? Did they do a quick burn or was that just a counter reset.
     
  29. Jan 29, 2020 #3,719

    Mushtang

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    They caught at least one of the fairing halves!
     
  30. Feb 1, 2020 #3,720

    SpaceManMat

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