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    Re: A Diy E6-B?
    From: Paul Hirose
    Date: 2021 Apr 13, 17:00 -0700

    On 2021-04-13 8:45, Tony Oz wrote:
    > I can't figure out how to label the concentric arcs on the slide, - what
    > radius step to use? I suppose it is NOT arbitrary.
    Actually, radius step of the speed arcs *is* arbitrary. If the radius
    scale is linear the device will work, regardless of the numbers you
    choose. Sometimes the slide has a different set of numbers on each side.
    Mine is 30 - 260 on one side, 150 - 700 on the other. The latter grid is
    shorter to make space at the bottom for the rectangular grid Dave
    mentioned. But a double wind grid is not universal, as you can see in
    the selection of E-6B computers at this site:
    The speed range can be extended by mentally multiplying or dividing by a
    factor such as 10. For example, the 30 - 260 grid can be used to solve
    set and drift problems for 3 - 26 knots.
    The Jeppesen CR computers have a completely different wind solution.
    They resolve the wind into tailwind and crosswind components. The
    tailwind component is mentally added to true airspeed to obtain ground
    speed. The crosswind component is converted to wind correction angle via
    a sine scale.
    This method eliminates the wind slide and permits a much smaller
    computer. However, the mental workload is greater. These computers can
    be recognized by their perfectly circular shape.
    Paul Hirose

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