Calculating Torque for Fan Speed

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To calculate the torque required to spin a fan blade, the weight of the fan is less significant than its design and size. A fan curve from the manufacturer provides essential data on the power needed at various speeds. The fan's speed does not directly affect torque; instead, operating conditions like pressure and airflow are crucial. Understanding the three Fan Laws or Affinity Laws can further aid in the calculations. Accurate torque calculations are vital for efficient fan operation.
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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?
 
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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.
 
...and the speed of the fan doesn't actually have a direct impact, it's the operating conditions: the pressure and airflow.
 
There are three Fan Laws or Affinity Laws that may help you get started:
http://www.nrmurphy.com/fans_laws.html
 

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