What generates the lift and propulsion required for flight in a helicopter?

• A. Main Rotor Blades
• B. Tail Rotor Blades
• C. Engine Turbines
• D. Transmission System

Answer: (A)

The main rotor blades are the primary components that generate lift and propulsion for a helicopter. As these blades rotate, they create a difference in air pressure above and below the blades, producing lift through the principles of aerodynamics. This lift allows the helicopter to rise off the ground and maneuver in the air.

The rotation of the main rotor blades is also responsible for generating thrust, which propels the helicopter forward or allows it to hover in place. Essentially, the main rotor acts as the helicopter's wings, but instead of being fixed, they rotate, providing the necessary lift and forward motion through their design and movement.

While the tail rotor blades contribute to directional control and stability, they do not generate the primary lift. The engine turbines provide power to the system, and the transmission system transmits that power to the rotor blades, but neither directly generates lift. Therefore, the main rotor blades are fundamentally critical for flight, making this the correct answer.