Spacex booster recovery w/o dry landing

Discussion in 'Fred's House of Pancakes' started by bwilson4web, Feb 2, 2018.

  1. Prodigyplace

    Prodigyplace 2025 Camry XLE FWD

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    I understand the fuel economy was atrocious though. :eek:;)
     
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  2. bat4255

    bat4255 2017 Prius v #2 and 2008 Gen II #2

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    Any status on drone ship landing?
     
  3. Dxta

    Dxta Senior Member

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    Well, thank God, pur falcon heavy rocket successfully blabsted off.

    Congrats to my "unofficial" mentor, Elon Musk.
     
  4. RRxing

    RRxing Senior Member

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    Go Starman Go!!!
    Screen Shot 2018-02-06 at 4.57.19 PM.png
     
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  5. bisco

    bisco cookie crumbler

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    everybody was watching from the pool, here in orlando. i didn't realize you could see it this far away.
     
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  6. bwilson4web

    bwilson4web BMW i3 and Model 3

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    Sorry, was there a football game commercial?

    Live payload feed:


    No range anxiety now.

    Bob Wilson
     
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  7. fuzzy1

    fuzzy1 Senior Member

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    It depends on when you figure it. At the moment the pulse phase ends, it will be bad. But after some glide time, it should be vastly better.
     
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  8. DavidA

    DavidA Prius owner since July 2009

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    Splashed. :(

    The sight of the twin side boosters landing on the 2 pads, in tandem, and just a half second apart, was astounding.
     
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  9. tochatihu

    tochatihu Senior Member

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    Intended barge-landing unit hit water at 300 mph, Perhaps nothing will be recovered from that.
     
  10. DavidA

    DavidA Prius owner since July 2009

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    Perhaps, but I do believe those things can float.

    In another forum entirely, this same discussion is ongoing. When one of the other moderators learned of the delayed and reported demise of the central booster, he typed "I never really liked that one." :ROFLMAO:
     
  11. tochatihu

    tochatihu Senior Member

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    The car was presumably registered in California. There is an "Affidavit of non-use" that allows owner to stop paying insurance and registration. As far as I can get through that, there is no place to choose among (my categories):

    Transferred to another state
    Lost
    Stolen
    Totaled
    Other (please specify)

    Last would apply, and include historically unique wording. So let us see that, Mr. Musk. "Launched into elliptical solar orbit" would tersely cover facts. But one hopes for a bit more exposition.

    ==
    float@30. Sealed metal tubes can float for sure. But this prompt deceleration could open the can. And down she goes.
     
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  12. bwilson4web

    bwilson4web BMW i3 and Model 3

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  13. bwilson4web

    bwilson4web BMW i3 and Model 3

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    More details about the center booster:
    Here’s what’s next for SpaceX after Falcon Heavy’s first flight - The Verge

    . . . SpaceX has a good idea of what went wrong with the third landing. The rocket needs three of the nine engines to land, and only one lit up. So that’s where they’ll start.
    . . .

    Source: Elon Musk's Tesla Roadster Is Headed to the Asteroid Belt

    . . .
    In a late-night update, Musk announced that the Falcon Heavy stage did survive its daring slog through the Van Allen belts.

    "Third burn successful," Musk wrote on Twitter. "Exceeded Mars orbit and kept going to the Asteroid Belt."

    Starman and the Roadster are now flying in a long, elliptical orbit around the sun. At its farthest point, that orbit extends nearly 243 million miles (390 million kilometers). That's 2.61 times the average distance between Earth and the sun, which is, on average, about 93 million miles (150 million km).
    . . .

    Bob Wilson
     
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  14. tochatihu

    tochatihu Senior Member

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    Mars avg distance to Sun 136 million miles. The red car furthest distance from Sun 243 million miles is a bit of an overshoot.

    What is minimum distance from Sun in this orbit? might get hot in there.
     
  15. fuzzy1

    fuzzy1 Senior Member

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    Perihelion at 0.98 AU, apohelion at 2.61 AU, according to Musk's tweet with an orbital map. But since you are across the Great Firewall:
    DVZ0h3YW4AIc-9w.jpg large.jpeg
     
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  16. Since2002

    Since2002 Senior Lurker

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    Actually five engines, with four combustion chambers each.

    No part of the Soyuz rocket is reusable. Some parts of the Soyuz capsule can be reused like the seats and some instruments, but not the capsule itself. Meanwhile SpaceX recently reused a Dragon capsule for the first time.

    The twelve smaller nozzles are for steering. They are actually just additional combustion chambers for the same engines as the larger combustion chambers, and are ignited at liftoff along with the twenty large combustion chambers. The big difference is that the smaller ones gimbal (i.e. swivel) for steering. All thirty-two combustion chambers are ignited a few seconds before liftoff. If the computer detects that one of the combustion chambers didn't ignite, the launch is automatically aborted. That is extremely rare but it did happen on a Soyuz launch in 2016 (which I happened to be watching live online). The problem turned out to be a failed ignitor. They replaced all the ignitors and launched 24 hours later.

    The SpaceX Falcon 9 is designed so that one or I think maybe even two (non-adjacent) engines can fail during flight and the remaining engines merely throttle up to make up the shortfall in thrust. And an exploding engine is contained so that the other engines aren't damaged. That actually happened on an early Falcon 9 flight. As for Falcon Heavy, I'm not sure how many of the 27 engines can go out and still make up for it.
     
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  17. fuzzy1

    fuzzy1 Senior Member

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    Spaceweather.com says something different, though it doesn't really change the question of how close it will get to the sun. Only the far end is way off.

    "It's official. Elon Musk's cherry red Tesla Roadster is a spacecraft. NASA is now listing the electric car in its database of celestial objects, and publishing an ephemeris for tracking it on JPL's Horizons web site.
    ...
    According to NASA, the Roadster is following an elliptical orbit around the sun ranging in distance from 0.99 AU to ~1.7 AU."

    Looking at a JPL table, it appears that the Perihelion (periapsis) discrepancy may be a small rounding vs truncation matter. But the apohelion discrepancy is quite large.
     
  18. bwilson4web

    bwilson4web BMW i3 and Model 3

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    What is the period?

    I suspect we'll know more once the first orbit completes.

    Bob Wilson
     
  19. Since2002

    Since2002 Senior Lurker

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    That is the revised estimate. Musk's post-launch tweet about it going to the asteroid belt was apparently based on preliminary data which turned out not to be correct. As SpaceX originally predicted it will go just past Mars orbit (but nowhere near Mars).

    18.8 months
     
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