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Weight vs Torque relation

  1. Apr 4, 2013 #1
    I am trying to figure out the torque vs weight relationship. I am working on a software project where I want to create an application to determine the maximum payload on vehicle with rubber tyre on asphalt road.

    I am having three parameter

    1. Torque
    2. RPM
    3. Diameter of tyre

    based on which I need to determine the payload capacity of a vehicle.

    Example 1

    Torque = 106 kg.cm
    RPM = 10
    wheel diameter = 10 cm
    Speed will be = 2 X pi X (diameter/2) X (RPM/60) = 5.24 cm/s

    Example 2
    Torque = 47.19kg.cm
    RPM = 200
    wheel diameter = 5 cm
    Speed will be = 2 X pi X (diameter/2) X (RPM/60) = 52.38 cm/s

    Example 3
    Torque = 109.20 kg.cm
    RPM = 60
    wheel diameter = 6 cm
    Speed will be = 2 X pi X (diameter/2) X (RPM/60) = 18.86 cm/s
  2. jcsd
  3. Apr 4, 2013 #2


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    Science Advisor
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    Gold Member

    Those three parameters aren't nearly enough.

    On level ground (and ignoring air drag and rolling resistance) the relationship is via acceleration not speed. eg The torque required to maintain a constant speed is zero because there are no forces to be overcome. On hills it's a different matter.
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