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Torque/ fan size

  1. Feb 8, 2009 #1
    Hello, I need figure out the torque is required to spin a fan blade at a certain speed. I know it doesn't particularly matter how big the fan is, but how heavy it is. I know a 1gm fan is much easier to turn than a 2gm fan.

    Can anyone help me?
  2. jcsd
  3. Feb 8, 2009 #2


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    Science Advisor
    Gold Member

    At a constant speed, it's not the weight that matters, it's the size of the fan (well, its design).

    Get a fan curve from the manufacturer, this shows you the power required to drive the fan at a range of speeds.
  4. Feb 8, 2009 #3


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    Staff: Mentor

    ...and the speed of the fan doesn't actually have a direct impact, it's the operating conditions: the pressure and airflow.
  5. Feb 9, 2009 #4
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