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  5. Constant N1 possible?

Constant N1 possible?

Scheduled Pinned Locked Moved 146 Professional
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  • M Offline
    M Offline
    mraviator
    wrote on last edited by
    #1

    I know there is no auto throttle. But why is it that when I set a constant N1 on ENG 1 and the others are synced to that, N1 will often roll +/- 3% without input?

    G P 2 Replies Last reply
    1
    • M mraviator

      I know there is no auto throttle. But why is it that when I set a constant N1 on ENG 1 and the others are synced to that, N1 will often roll +/- 3% without input?

      G Offline
      G Offline
      Genista
      wrote on last edited by
      #2

      @mraviator I noticed that N1 will increase as you get faster, and decrease as you get slower.

      It hard to find that sweet spot of constant N1 where the aircraft doesn't accelerate nor slow down !

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      • NerdbarkN Offline
        NerdbarkN Offline
        Nerdbark
        wrote on last edited by Nerdbark
        #3

        In cruise, I find setting the TMS to TGT mode with the current TGT temperature at the desired cruise speed dialed in on the thumb wheel, of the TMS, holds speed a lot better. You can make small adjustments to the temperature input of the TMS and the engines will adjust accordingly. This only works if the TGT temps are above 600°. Makes a world of difference

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        • M mraviator

          I know there is no auto throttle. But why is it that when I set a constant N1 on ENG 1 and the others are synced to that, N1 will often roll +/- 3% without input?

          P Offline
          P Offline
          plhought
          wrote on last edited by
          #4

          @mraviator It's an ALF502. On the real aircraft is is kinda finniky that way.

          The thrust management system is literally linear-actuators inline with the cable input into the fuel control on the engine. It hunts a bit before settling down.

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          • M Offline
            M Offline
            mraviator
            wrote on last edited by
            #5

            Interesting details. Thank you all!

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            • G Offline
              G Offline
              Genista
              wrote on last edited by
              #6

              Is TGT used for cruise IRL ? No phasing issues when engines have slightly different N1 RPM ?

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              • G Genista

                Is TGT used for cruise IRL ? No phasing issues when engines have slightly different N1 RPM ?

                P Offline
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                plhought
                wrote on last edited by
                #7

                @genista It isn't used in RL typically in cruise. Typically N1 Sync with engine 1 or 2.

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                • P plhought

                  @genista It isn't used in RL typically in cruise. Typically N1 Sync with engine 1 or 2.

                  J Offline
                  J Offline
                  jmarkows
                  wrote on last edited by
                  #8

                  @plhought Do you know when you would want N1 vs N2 sync? It's an option both here and the Aerosoft CRJ, but I don't know when you would want one versus the other.

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                  • NerdbarkN Offline
                    NerdbarkN Offline
                    Nerdbark
                    wrote on last edited by Nerdbark
                    #9

                    BFDB7D81-1C45-44F3-A2D8-0201AAD554A3.jpeg

                    This is from the manual, either can be used

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