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View Full Version : How to use a Tachymeter?



JRH147
03-31-2004, 03:34 PM
I just got a watch that has a Tachymeter printed around the outside of the watch. How is this used in aviation?

From what I've read so far, it seems like if you know your airspeed is 240 kmh, then you check out the watch, see that 240 is at the 15 second mark, then you can start the watch, wait 15 seconds, and then know you've traveled one kilometer.

Is that true?

JRH147
03-31-2004, 03:34 PM
I just got a watch that has a Tachymeter printed around the outside of the watch. How is this used in aviation?

From what I've read so far, it seems like if you know your airspeed is 240 kmh, then you check out the watch, see that 240 is at the 15 second mark, then you can start the watch, wait 15 seconds, and then know you've traveled one kilometer.

Is that true?

il_gufo
03-31-2004, 03:49 PM
Yes, that is true. You can also work it in reverse. Use the stop watch to time some repeating event and then you can read off the tachymeter how many times that event happens in one hour. Examples of events would be flying one kilometer, burning a gallon of fuel, tying your shoe, whatever.