Discussion in 'General' started by Chasbro, Sep 28, 2019.

  1. Knotcher

    Knotcher Well-Known Member

    Cool pic.

    F1 is still king ding-a-ling of all manmade objects. :D
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  2. NemesisR6

    NemesisR6 Gristle McThornbody

    So, silly question.

    It's obvious that the starship probably could have landed with 2 engines if maybe that flame-out wouldn't have happened so late in the landing. Redundancy and such probably dictates one engine can fail without too severe consequence.

    However, is there any chance that things lands with one engine if the fault happens early enough in the procedure that the telemetry can recognize and compensate for it?
  3. OGs750

    OGs750 Well-Known Member

    That's a good question and it would be nice to have redundancy somewhere in the chain, but I don't think a failure like that could have been recognized early enough. The dynamics of the fast flip is likely what caused the issues and by that time it's already too late to compensate with a longer single engine burn. Maybe if the flip happened earlier it could possible, but I don't know what limitations avionics are playing with.

    For instance, as @mpusch mentioned earlier, the reason for a two engine landing is because Raptor can't throttle the engines low enough to land with three, so if the two engine landing started earlier we'd likely be thrust positive well before the vehicle landed. No good. Fun fact, F9 goes thrust positive the moment before it lands and the engines shut down. It's a move called a hover slam.

    Maybe they could figure out a scheme where the flip happens early and all three engines light to scrub the majority of the speed then kill two and do a single engine landing a la F9. I'm not sure how much aero is depended on to slow the vehicle, so they might not be banking on having that kind of fuel margin to do a three engine burn.

    I think the best solution is to develop the engine enough so ensure reliability. The whole point of Starship is to fly to Mars and back and rebuilding engines on the Martian surface is probably a non-starter for a while.

    Of course this is all a guess. I'm a structural guy, so propulsion and especially avionics are like magic to me. :D
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  4. crashman

    crashman Getting slower every day

    So it is your fault that the landing gear was too weak to absorb the impact of that little bump?:Poke::D
    drop, NemesisR6, Monsterdood and 2 others like this.
  5. rwdfun


    Well they would have had to flip down first. Hopefully he wasn’t in charge of that part

    Hopefully you didn’t work on the SN9 support structure. That is sort of a colossal F up
    OGs750 likes this.
  6. motion


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  7. motion


    Anyone have any knowledge re SN9 test timing?
  8. mpusch

    mpusch Well-Known Member

    Road closures scheduled starting tomorrow, but last I looked a specific reason wasn't provided. Might get canceled, or who knows, maybe it'll still be used.

    Next step should be atmospheric and cryo pressure testing. Supposedly they're going right to a 3 engine static fire, then a launch if everything checks out.

    Raptors already installed, so... Maybe 2-3 weeks before a launch if everything went smoothly? Who knows.
    motion likes this.
  9. CRA_Fizzer

    CRA_Fizzer Honking at putter!

    Is the SN9 hop happening tomorrow?

    Sent from my SM-G960U using Tapatalk
  10. mpusch

    mpusch Well-Known Member

    Maybe :D

    There's an active TFR and road closures that fit the bill for tomorrow. Wouldn't be surprising for additional prep after doing two static fires today though.
  11. mpusch

    mpusch Well-Known Member

    Make that *three* static fires in one day. Cool!

    Though I'm sure you've seen already, big hop is not going to happen today. Likely will in the next week though.
  12. Gino230

    Gino230 Well-Known Member

    Did it go last night? I was flying into FLL but the TFR was not active until 30 min after landing. I was guessing they would scrub it due to weather. Still waiting to see one of these from the air....
  13. mpusch

    mpusch Well-Known Member

    Nope, but they did 3 static fires in a few hours.
  14. mpusch

    mpusch Well-Known Member

    Flight is currently tracking for Monday...
    motion likes this.
  15. BC

    BC Well-Known Member

    Something just launched from the Cape.
  16. mpusch

    mpusch Well-Known Member

    Spacex. Transporter mission for a ridiculous amount of small satellites.
  17. CRA_Fizzer

    CRA_Fizzer Honking at putter!

    Is SN9 hopping today?
  18. motion


    There should be great Starlink train visibility for the next several days. I have my alarm set for Wed morning 6:20 AM.
    CRA_Fizzer likes this.
  19. motion


    Looks like a 12km hop this afternoon:
  20. CRA_Fizzer

    CRA_Fizzer Honking at putter!

    Yep, been watching that.

    Was hoping our man on the inside had the "official" scoop.

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