Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Automotive How to calculate how much power required to turn a flywheel?

  1. Jun 9, 2016 #1
    How to calculate how much power required to turn a flywheel at constant velosity ? Suppose I have a flywheel of 24 inch diameter, width 5 inches,50kg and constant angular velosity is 1500 rpm. How do I calculate the required power (HP) to turn this or any other with different values?
  2. jcsd
  3. Jun 9, 2016 #2


    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    If there are no losses (eg no friction or air resistance) then it takes no power to keep it running at a constant angular velocity.
  4. Jun 10, 2016 #3
    If there are no losses you can use the formula

    Energy= 1/2 * I * W2

    I= m*r2 * constant depending on shape

    then divide by the time you want it to reach the angular speed you want (e.g in 10 sec ...)
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted