speedo question, what is that?

[stockman1]

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?

[MikeFleming]

Those are meter calibration markings.

[stockman1]

Those are meter calibration markings.come again? Surprised I could see them, new glasses!

[MikeFleming]

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.

[stockman1]

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.

[MikeFleming]

Speed cal on aircraft is a bit more high tech than that. Most car drivers aren't interested in air speed.

[stockman1]

Most car drivers aren't interested in air speed.then they don't drive fast enough

[rodster]

then they don't drive fast enough

:D

down hill with a tail wind!