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drone basic physics

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http://www.droneybee.com/arduino-quadcopter-guide/ The Kv (kilovolts) – rating in a motor demonstrates how various RPMs (Revolutions each moment) the motor will do per volt. The higher the kV rating is, quicker the motor rotates at a steady voltage.


The relationship between this thrust and the RPM of the motors or the angular velocity (Av) is approximately quadratic. That is, FRes = K * Av^2 (where K is some constant). We have also established what a drag is. Each rotor in a quadcopter has to overcome drag every time it spins. And as you may already know, a moment is the ability to make an object rotate (torque).  The relationship between the RPM and the drag moment (T) is also quadratic. That is, T = K * Av^2