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    L-Variable: RPM_needle

    PA-28R Arrow III
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    • F
      fsh1hh last edited by

      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!

      Martyn 1 Reply Last reply Reply Quote 0
      • Martyn
        Martyn JF Staff @fsh1hh last edited by

        @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 1 Reply Last reply Reply Quote 1
        • F
          fsh1hh @Martyn last edited by

          @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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