Which rotor directions describe a counter-rotating prop-rotor system?

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Multiple Choice

Which rotor directions describe a counter-rotating prop-rotor system?

Explanation:
Two rotors on the same axis spin in opposite directions to cancel the torque on the airframe and neutralize the swirl in the airflow. In this convention, the left-hand rotor turns counterclockwise while the right-hand rotor turns clockwise. That opposite pairing is what makes the system counter-rotating, providing smoother handling and more efficient thrust by eliminating the net reactive yaw and swirl produced by a single-rotor setup. If both rotors turned the same way, the torque and swirl wouldn’t cancel, which is why opposite directions are essential.

Two rotors on the same axis spin in opposite directions to cancel the torque on the airframe and neutralize the swirl in the airflow. In this convention, the left-hand rotor turns counterclockwise while the right-hand rotor turns clockwise. That opposite pairing is what makes the system counter-rotating, providing smoother handling and more efficient thrust by eliminating the net reactive yaw and swirl produced by a single-rotor setup. If both rotors turned the same way, the torque and swirl wouldn’t cancel, which is why opposite directions are essential.

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