The concept of contra-rotating propellers involves the installation of two propellers on a single piston or turboprop engine, one positioned immediately behind the other, rotating in opposite directions on the same axis. This creates a fascinating synchronized motion, where one propeller spins clockwise while the other spins counterclockwise. At low speeds during flight, the spinning blades of a propeller generate significant rotational airflow. In a single-rotor design, this airflow is often wasted, and can lead to stability issues, causing the aircraft to turn left or right depending on the propeller's rotation direction – called torque effect. Thereby, the presence of contra-rotating propellers maximizes the utilization of this airflow, offering high performance and minimal energy loss while countering the torque effect.

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