What is the principle of the helicopter?

The flight principle and structure of a helicopter is different from that of an airplane. An airplane relies on its fixed wings to generate lift, while a helicopter relies on the rotation of the blades (propellers) on its head to generate lift. The tail of the single-rotor helicopter is also equipped with a tail, its main function: anti-torsion, to balance the reaction torque generated by the single-rotor and control the turning of the helicopter.