SIFT Army Aviation Information Practice Test 2025 – All-in-One Study Guide for Exam Success!

The tail rotor on a helicopter primarily serves the purpose of producing an anti-torque force that counteracts the rotational torque generated by the main rotor. As the main rotor spins, it creates a torque effect that tends to rotate the helicopter's body in the opposite direction. If unopposed, this torque would cause the helicopter to spin uncontrollably. The tail rotor, positioned at the rear of the helicopter, generates thrust in a direction that counterbalances this torque, thus maintaining the helicopter's stability and allowing the pilot to control its yaw.

In contrast, the other options do not accurately represent the main function of the tail rotor. The creation of kinetic energy to potential energy during climbing relates more to the main rotor's function, not the tail rotor. Similarly, the concept of producing rotational momentum for driving a generator is unrelated to the tail rotor's primary role. Therefore, the correct answer highlights the essential function of the tail rotor in providing stability and control by countering torque.