Which component is essential for anti-torque in the TH-73A?

• A. Main rotor
• B. Tail rotor
• C. Control stick
• D. Stabilizer bar

Answer: (B)

The tail rotor is essential for anti-torque in the TH-73A helicopter. In helicopter flight, torque is produced by the rotation of the main rotor; this torque tends to rotate the helicopter's fuselage in the opposite direction. To counteract this torque and maintain directional stability, the tail rotor works effectively by producing thrust in the horizontal plane. This thrust can be adjusted through the pilot's control inputs, allowing for yaw control and ensuring that the helicopter can remain stable and maneuver as intended.

The main rotor, while crucial for generating lift and overall flight capabilities, does not address the issue of torque directly. The control stick assists in maneuvering but does not provide anti-torque function. Similarly, the stabilizer bar is a component that helps with stability of the rotor system but does not actively counteract the torque generated by the main rotor. Thus, the tail rotor's role in providing the necessary anti-torque force is vital for safe and effective helicopter operation.