• ptfrd@sh.itjust.works
    link
    fedilink
    English
    arrow-up
    8
    ·
    edit-2
    4 days ago

    Interesting! They’re talking about unnecessary aborts, and how they want to do as much analysis as possible of the abort criteria, to prevent them.

    This will remain an issue for Flight 6 which, it seems, will happen the moment SpaceX decides it’s sufficiently ready. Unlike previous flights …

    “Given this is the first launch in a long time … well really ever … that we’ve not been FAA driven …”

  • ptfrd@sh.itjust.works
    link
    fedilink
    English
    arrow-up
    6
    ·
    edit-2
    4 days ago

    The SpaceX officials in the audio said they were “trying to focus on booster risk reduction versus ship envelope expansion” for the next flight.

    For the “ship envelope expansion”, do you think they will/should do an in-space engine relight test? Or are the seemingly successful flip-landing maneuvers on flights 4 and 5 sufficient? (Has this been covered elsewhere?)

    • Zron@lemmy.world
      link
      fedilink
      English
      arrow-up
      5
      ·
      4 days ago

      The setting stage, Starship, needs to do in space engine relights.

      Starship is supposed to go all the way to the moon. They need to demonstrate that refueling in space is possible, that the engines relight multiple times in orbit and after multiple days, and that it’s capable of landing safely on the moon.

      • ptfrd@sh.itjust.works
        link
        fedilink
        English
        arrow-up
        2
        ·
        3 days ago

        that the engines relight multiple times in orbit

        Should they do an orbital test next? Or continue with the previously used ‘almost orbit’ trajectory that ensures the second stage re-enters safely with no need for a relight?

        • Strykker@programming.dev
          link
          fedilink
          English
          arrow-up
          4
          ·
          3 days ago

          They should prove relight during these suborbital flights, anything else is just asking to accidentally leave a starship sized chunk of debris in orbit for a few months-years

          • Zron@lemmy.world
            link
            fedilink
            English
            arrow-up
            2
            ·
            3 days ago

            Back during Apollo, they relit the lunar transfer stage engines in orbit, and just pointed it so it would escape earth and go into deep space.

            This also allowed them to have the stage fueled, without risking a giant explosion if it entered the atmosphere. Because the stage was already in a stable orbit, even if the engine didn’t light, all of the fuel would boil off before it entered the atmosphere.

            A suborbital flight would only allow a short term test, whereas the real HLS will be spending many days between relights. Plus, the ship will be entering the atmosphere with a substantial amount of fuel in the tanks, which just seems needlessly dangerous.