I just completed building my new quad-C and made my first test flight. During testing I noted that one motor spun down much more quickly than the others, like it had much higher internal friction. In my short test flight I noticed that the copter had a tendency to pull in the direction of this motor. With is this because of the motor being more difficult to power? Do I need to replace the motor?
I thought that perhaps ESCs were capable of sensing the speed of the motor, so that all four motors would spin at the same speed regardless of their friction, is this correct? Or do they just give a certain amount of power and motors get the speed they get?
I'm hoping to learn something from your answers :-)