It’s rate of rotation. For a quadcopter your whole drone can rotate in 3 axes, and you control each axis by speeding up two rotors and slowing the other two down.
For yaw, you speed up one diagonal pair and slow down the other diagonal pair, and you turn because one pair is turning clockwise and the other pair is turning counterclockwise.
For pitch and roll, your pairs each have one clockwise and one counterclockwise, so it balances out the yaw.
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