Clockwise/Counter-Clockwise
Rotational movement depends on torque. To rotate the drone clockwise, propeller 2 and 3 must
rotate at a faster rate than propeller 1,4. This is because the reaction clockwise torque
generated from propeller 2,3 will be greater than the reaction counter-clockwise torque
generated from propeller 1,4. On the contrary, to rotate the drone counter-clockwise,
propeller 1 and 4 must rotate at a faster rate than propeller 2,3.
Calculation Example:
Suppose the propeller 1,4 each
produces a counter-clockwise torque of magnitude 2 Nm and the propeller 2,3 each produces a
clockwise torque of magnitude 1 Nm. Will the drone rotate clockwise or counter-clockwise?
Since the sum of the counter-clockwise torque,4 Nm, is greater than the sum of the
clockwise torque, 2 Nm, the drone will rotates counter-clockwise.