Some friends want to know more about the balance of multicopter, let's start from balancing the props of a multi.
The clever electronics in your control board that keep your aircraft controllable can be very easily upset by vibrations in the airframe. If your props aren't balanced (one blade is slightly heavier than the other) then they will create lots of vibration when they are spinning. Vibration can also damage your motors and rattle your screws loose.
Balancing propellers is a simple procedure and only takes a couple of minutes. Although a good prop balancer can do a more precise job and only costs $15 or so, you can balance a prop using a simple thin metal shaft (eg a nail) and get a decent result.
For FPV, where vibrations can turn your video feed to jelly, some pilots also dynamically balance each motor and prop as a whole. This is a little more complex, but might be worthwhile if you're having trouble with vibrations.
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