What is the primary purpose of the tail rotor in a helicopter?

• A. Increase lift
• B. Counteract the torque effect of the main rotor
• C. Stabilize lateral motion
• D. Assist in ascending

Answer: (B)

The primary purpose of the tail rotor in a helicopter is to counteract the torque effect of the main rotor. When the main rotor spins in one direction, it creates a reactive torque in the opposite direction. Without the tail rotor, the helicopter would spin uncontrollably due to this torque. The tail rotor generates thrust that pushes against this torque, allowing the helicopter to maintain stable flight and directional control.

In essence, the tail rotor plays a crucial role in keeping the helicopter aligned during flight. By adjusting the angle of the blades on the tail rotor, the pilot can control the helicopter's yaw, enabling it to turn left or right as needed. This functionality is critical for maneuverability and safety in flight operations.