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EAS with CR-3

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  • EAS with CR-3

    Good morning,

    the problem is this:


    Cas 250 KT
    Pressure altitude FL 400
    Temperature -56 degrees


    Calculations : 470 Kt TAS --> over 300 kts , I need to convert in EAS

    i got a CR- 3 not CRP5



    Any suggestion?

  • #2
    FL 400, 250 KCAS gives 234 KEAS. The temperature makes no difference to the CAS EAS conversion

    AFIK you can't convert CAS to EAS with an aviation circular slide rule.

    You can do it with this chart.

    Compressibility correction.pdf

    Look up ΔVC from the chart then subtract from CAS to give EAS.

    Out of interest, why do you need to know EAS?
    Attached Files
    Last edited by Ortac; 26-10-2017, 00:45.

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