Tail rotor blades are aerodynamically similar to main rotor blades but smaller.

• A. False
• B. They are larger than main rotor blades
• C. They do not generate any thrust
• D. True

Answer: (D)

The tail rotor works on the same aerodynamic idea as the main rotor: an airfoil blade with a controllable pitch that generates thrust as it moves through the air. Because the tail rotor’s job is to produce a specific amount of thrust to counteract the main rotor’s torque, its blades are scaled down in diameter and chord compared to the main rotor, while still using a similar airfoil shape and blade twist to move air efficiently. That’s why the statement is true: they share the same aerodynamic principles, but are smaller to provide the necessary anti-torque thrust without needing a larger, power-hungry tail rotor.

Saying they are larger would misstate the design purpose, and saying they do not generate any thrust is wrong because their whole function is to create thrust to balance torque.