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How to determine torque required to spin a fan?

  1. Jun 12, 2014 #1
    So I want to design a propeller that will slow down a motor and I want to know what formulas or equations I would use to calculate that torque.
    Also, if I decided I wanted to run it in a fluid, what it just be a matter of density change?

    I have attached a picture of what I want to do.

    Thanks
     

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  2. jcsd
  3. Jun 28, 2014 #2
    It's mass moment of inertia will have a part to play in it
     
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