The primary purpose of the tail rotor is to counteract the torque effect of which rotor?

• A. Counteract the torque effect of the Tail rotor
• B. Counteract the torque effect of the Main rotor
• C. Offset the thrust of the main rotor
• D. Stabilize yaw without torque considerations

Answer: (B)

The main idea is anti-torque: the main rotor creates torque that would spin the helicopter’s fuselage in the opposite direction. The tail rotor provides a sideways thrust at the tail to counter that torque, keeping the body steady and allowing you to control yaw by adjusting tail-rotor thrust. So the tail rotor’s primary job is to counteract the main rotor’s torque.

That’s why the other possibilities aren’t right: it doesn’t counteract its own torque, it doesn’t offset the main rotor’s thrust (which is about lifting, not anti-torque), and yaw stability comes from balancing that anti-torque effect, not from stabilizing yaw without considering torque.