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

• A. To enhance fuel efficiency
• B. To provide lift during vertical takeoff
• C. To counteract torque produced by the main rotor
• D. To assist in navigation and control

Answer: (C)

The primary purpose of the tail rotor in a helicopter is to counteract the torque produced by the main rotor. When the main rotor spins, it generates a torque that tends to rotate the helicopter in the opposite direction. The tail rotor, positioned at the back of the helicopter, creates thrust that counterbalances this torque, allowing the helicopter to maintain stability and control during flight. By adjusting the pitch of the tail rotor, the pilot can control the yaw of the aircraft, which is crucial for directional movement and maintaining desired flight attitudes.

Fuel efficiency, lift during vertical takeoff, and navigation assistance are aspects of helicopter operation but do not define the primary function of the tail rotor. Enhancing fuel efficiency relates more to the overall design and aerodynamics of the helicopter rather than the tail rotor's role. Similarly, while the main rotor is responsible for lift, the tail rotor's role is specifically to counteract the effects of the main rotor's torque.