Select the right motor

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**The contents offered on this page are extracted from Painless360 YouTube Channel who kindly allowed me to publish his work

 

To fly a multirotor we have to overcome gravity.
The amount of thrust that the motors generates has to be more than gravity to make it rise into the air. For exemple if we have a 1000g multirotor, we need twice the amount of thrust to hover and each motor will have to deliver an element of that thrust. 

That's the theory, in practice we need a little bit more than two times to make sure that we have enough headroom. The reason for that is that the motor output and thrust available isn't linear and changes to the throttle range and that's due to a couple of things: efficencies the motor itself and also with the dynamics at the rotor. Going back to the previous exemple, with a 1000g model we need 2000g x 1.2 = 2400g that we have to divide by the number of motors that we have.



Needed Thrust for each motor = [(ModelWeight * 2)  * 1.2] / Number of motors


IMPORTANT NOTES:

  • Use the recommended rotor on the motor for that cell count - 4s will give you more than 3s but the motor will like to swing a smaller prop doing it
  • Larger propellers swinging at lower RPM are more efficient. KV and speed are not the only factors
  • If you need to lift something with your model add this weight into the calculations
  • Use an ESC that gives you 20% headroom for the maximum current
  • If in doubt, go one size bigger
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