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  5. L-Variable: RPM_needle

L-Variable: RPM_needle

Scheduled Pinned Locked Moved PA-28R Arrow III
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  • F Offline
    F Offline
    fsh1hh
    wrote on last edited by
    #1

    Hello,

    I'm trying to create an SD profile.

    Now I'm at the L variable "RPM_needle". The values there do not correspond to the rotational speed.

    Before I do the math and calculate how to derive the speed: Do any of you know the corresponding formula?

    Many thanks!

    MartynM 1 Reply Last reply
    0
    • F fsh1hh

      Hello,

      I'm trying to create an SD profile.

      Now I'm at the L variable "RPM_needle". The values there do not correspond to the rotational speed.

      Before I do the math and calculate how to derive the speed: Do any of you know the corresponding formula?

      Many thanks!

      MartynM Offline
      MartynM Offline
      Martyn
      JF Staff
      wrote on last edited by
      #2

      @fsh1hh That variable is coded to control the needle animation so you'd be better off using the 'A:PROP RPM:1, rpm' variable if possible? If not, here's the conversion (prop RPM on the left, L variable value on the right):

      300.0, 0.0
      500.0, 14.0
      1000.0, 45.0
      1500.0, 76.0
      2000.0, 108.0
      2500.0, 140.0
      2700.0, 153.0
      3000.0, 171.0
      3500.0, 200.0

      Martyn - Development Manager

      F 1 Reply Last reply
      1
      • MartynM Martyn

        @fsh1hh That variable is coded to control the needle animation so you'd be better off using the 'A:PROP RPM:1, rpm' variable if possible? If not, here's the conversion (prop RPM on the left, L variable value on the right):

        300.0, 0.0
        500.0, 14.0
        1000.0, 45.0
        1500.0, 76.0
        2000.0, 108.0
        2500.0, 140.0
        2700.0, 153.0
        3000.0, 171.0
        3500.0, 200.0

        F Offline
        F Offline
        fsh1hh
        wrote on last edited by
        #3

        @martyn
        Hello Martyn,
        thank you for the fast feedback. Then I actually prefer to use the A variable. And that's the way I go with "SUCTION PRESSURE, psi". (Whereby the displayed values do not match the display in the cockpit. But I hope to find a solution for that)

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