Question

What should be the direction of the movement of propellers in a quadcopter?
And what can be the max. weight 4small size motor can withstand and make it fly(quadcopter).
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Answer 1

Dear student,

Quadcopters generally use two pairs of identical fixed pitched propellers; two clockwise (CW) and two counterclockwise (CCW). These use independent variation of the speed of each rotor to achieve control. By changing the speed of each rotor it is possible to specifically generate a desired total thrust; to locate for the centre of thrust both laterally and longitudinally; and to create a desired total torque, or turning force.

At a small size, quadcopters are cheaper and more durable than conventional helicopters due to their mechanical simplicity

However, as size increases, fixed propeller quadcopters develop disadvantages over conventional helicopters. Increasing blade size may increases their momentum. This means that changes in blade speed take longer, which negatively impacts control. Helicopters do not experience this problem as increasing the size of the rotor disk does not significantly impact the ability to control blade pitch.

Regards