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Oxygen PSI

Scheduled Pinned Locked Moved Starship
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  • A Offline
    A Offline
    ADFGVX
    wrote last edited by
    #1

    The oxy psi is constantly at 1850, shouldn't it change over time, or only if the mask are actually deployed , not only armed?

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    • J Offline
      J Offline
      jmarkows
      wrote last edited by
      #2

      I don't believe oxygen is used unless the masks are deployed. The cabin is pressurized with outside air normally, so it wouldn't need it.

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      • M Offline
        M Offline
        MD82
        wrote last edited by
        #3

        To be fair. It should drop over time if you test your oxygen before every flight as well. If only by a tiny amount at a time.

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        • A Offline
          A Offline
          ADFGVX
          wrote last edited by ADFGVX
          #4

          Yes that is what I thought, and I am also asking because I see this slight depletion in the Hotstart TBM 900. So my question was more: is this something yet to be simulated more precisely or is the Starship using another system

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          • MarionetteworkM Online
            MarionetteworkM Online
            Marionettework
            wrote last edited by
            #5

            This brings me to a question: I recall the manual states that at 40000 ft there is less than a minute of oxygen. How do you drop to a safe altitude (like 12000 ft) in that amount of time, in real life?

            P 1 Reply Last reply
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            • A ADFGVX

              Yes that is what I thought, and I am also asking because I see this slight depletion in the Hotstart TBM 900. So my question was more: is this something yet to be simulated more precisely or is the Starship using another system

              Black SquareB Offline
              Black SquareB Offline
              Black Square
              Black Square Developer
              wrote last edited by
              #6

              @ADFGVX Oxygen depletion has been realistically simulated in all of my aircraft starting with the Analog Caravan. You will see oxygen be consumed according to the occupancy and weight of your passengers, and the current cabin altitude.

              Oxygen is only consumed when the system is deployed, manually or automatically, in the event of a high altitude cabin. It is also consumed while testing the crew oxygen masks, though probably in amounts too small to tell.

              @Marionettework That's 1-2 minutes of useful consciousness without supplemental oxygen. The duration that the oxygen system will last depends on occupancy.

              You can also monitor the blood oxygen concentration of the pilot with the pulse oximeter on the cabin visualizer. The extreme temperature (blue and red) LED's on the instrument panel will also flash alternately when the cabin altitude is dangerously high (~15,000ft) and the oxygen system should be deployed.

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              • A Offline
                A Offline
                ADFGVX
                wrote last edited by
                #7

                Thanks for the clarification

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                • MarionetteworkM Marionettework

                  This brings me to a question: I recall the manual states that at 40000 ft there is less than a minute of oxygen. How do you drop to a safe altitude (like 12000 ft) in that amount of time, in real life?

                  P Online
                  P Online
                  plhought
                  wrote last edited by
                  #8

                  @Marionettework

                  Gear down, props fine, right back to flight idle, pitch down to peg it at max gear speed.

                  But ultimately - that's why there's quick-don masks so the crew can retain consciousness during the rapid descent.

                  Patrick

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                  • P plhought

                    @Marionettework

                    Gear down, props fine, right back to flight idle, pitch down to peg it at max gear speed.

                    But ultimately - that's why there's quick-don masks so the crew can retain consciousness during the rapid descent.

                    Patrick

                    S Offline
                    S Offline
                    SinkRate
                    wrote last edited by
                    #9

                    @plhought Does the BE-2000 emergency descent procedure actually have you descend at VLo? Every jet I've flown that has you put the gear down for an emergency descent wants you to descend at Mmo/Vne. To hell with the gear speed lol.

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                    • P Online
                      P Online
                      plhought
                      wrote last edited by
                      #10

                      I wouldnt know. I'm pretty sure at altitude you'd be below the gear speed till 12-13k anyways.

                      Patrick

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