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Thread: speedo question, what is that?

  1. #1
    SHAFT stockman1's Avatar
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    speedo question, what is that?

    Was driving the SVO to St Augustine today (nations oldest city) to visit some friends and noticed 2 dots by the 10 MPH, 2 dots by the 40 and 2 by the 70? Any significance to that or am I seeing things?

  2. #2
    Red Captain MikeFleming's Avatar
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    Those are meter calibration markings.
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  3. #3
    SHAFT stockman1's Avatar
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    Quote Originally Posted by MikeFleming View Post
    Those are meter calibration markings.
    come again? Surprised I could see them, new glasses!

  4. #4
    Red Captain MikeFleming's Avatar
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    You're a pilot, right??

    Calibration marks. Each speedometer is tested at a couple (or more) MPH/kph points and as long as it reads between the dots, it's good enough for production use. For example if the speed cable is running at 70MPH, as long as the needle shows between 68 and 72, it's good to go.
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    SHAFT stockman1's Avatar
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    Quote Originally Posted by MikeFleming View Post
    You're a pilot, right??

    Calibration marks. Each speedometer is tested at a couple (or more) MPH/kph points and as long as it reads between the dots, it's good enough for production use. For example if the speed cable is running at 70MPH, as long as the needle shows between 68 and 72, it's good to go.
    wow thanks, interesting! Speed cal on aircraft is a bit more high tech than that.

  6. #6
    Red Captain MikeFleming's Avatar
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    Speed cal on aircraft is a bit more high tech than that.
    Most car drivers aren't interested in air speed.
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    SHAFT stockman1's Avatar
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    Quote Originally Posted by MikeFleming View Post
    Most car drivers aren't interested in air speed.
    then they don't drive fast enough

  8. #8
    Half Boost rodster's Avatar
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    Quote Originally Posted by stockman1 View Post
    then they don't drive fast enough


    down hill with a tail wind!

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