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Formulary Driving speed


All the values are needed to calculate thetravelling speed ...


The driving speed can be calculated from the speed of the driven axle directly or from the engine RPM and the transmission ratios of the gearbox and axle drive. In each case the dynamic wheel radius is necessary to do this. Actually, for this purpose, the distance between the wheel center and the road surface should be determined at the respective driving speed, because this distance becomes larger with increasing speed.

      2 · rdyn · · nA · 60
v =
       1000

            v · 1000
rdyn =
           2 · · nA · 60

      v · 1000
nA =
        2 · · rdyn · 60

Check your calculation!     You need help?
Please enter numbers only in two of the three fields!
nA Driven-wheel speed 1/min
rdyn Wheel radius m
v Driving speed km/h

        2 · rdyn · · n M· 60
v =
          iG · iA · 1000

          v · iG · iA · 1000
rdyn =
            2 · · nM · 60

          v · iG · iA · 1000
nM =
        2 · · rdyn · 60

Check your calculation!     You need help?
Please enter numbers only in four of the five fields!
nM Engine speed 1/min
rdyn Radius m
iG Transmission ratio
iA Axle drive ratio
v Travelling speed km/h

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