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5 Answers

E6B TAS above 260 kt – wind triangle – WCA etc.

Asked by: 2791 views
Commercial Pilot, Private Pilot, Student Pilot

Hello,

 

can anyone tell me how to work with the E6B with TAS above 260 kt on the back side?

For example a wind triangle/WCA hast to be calculated and a data with 465 TAS, but the E6B just show until 260 kt.

Is there a way to work out this with the E6B or is the E6B not suitable above 260 kt ?

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5 Answers

  1. Best Answer


    Russ Roslewski on Apr 22, 2018

    I imagine you could just divide all speeds by the same number (like, 5 – whatever gets the speeds into the right range for the plotter) and work it that way.

    So, TAS/5
    Wind speed/5

    Get the result, then multiply by 5.

    I don’t see why that wouldn’t work.

    Try it then compare your answer with an electronic E6B and you’ll know.

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  2. KDS on Apr 23, 2018

    When speed gets up that high, the error factor due to compressibility becomes greater.

    The E-6B design predates WW II when speeds in that range were not considered.

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  3. Russ Roslewski on Apr 23, 2018

    But those errors occur before the conversion to TAS – so, once the OP has determined the TAS, the E6B should work fine. It’s then down to a matter of scaling, and geometry.

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  4. ChrisFly on Apr 23, 2018

    @ Russ Roslewski
    works indeed.
    How you said it comes down to a matter of scaling.

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  5. KDS on Apr 23, 2018

    Russ, you’re 100% correct. I thought he was asking about calculating TAS given IAS at higher speeds. The trigonometry does indeed remain the same proportionally if one already has the TAS as a given.

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