Which component in a helicopter assists in controlling blade pitch?

• A. Swashplate
• B. Rotor hub
• C. Main shaft
• D. Tail rotor

Answer: (A)

The swashplate is a crucial component in a helicopter that assists in controlling the pitch of the rotor blades. This mechanism allows the pilot to adjust the angle of the rotor blades as they rotate.

The swashplate consists of two parts: a stationary part that is fixed to the helicopter and a rotating part that turns with the rotor blades. As the pilot moves the controls, the swashplate tilts, which alters the pitch of each blade at different points in their rotation. This action enables the helicopter to climb, descend, or change direction by varying the lift produced by the rotor blades.

The rotor hub is integral to the support and movement of the blades, allowing them to rotate and providing a structural connection to the helicopter's body, but it does not directly control the pitch. The main shaft primarily transmits power from the engine to the rotor assembly and does not influence the blade angle. The tail rotor provides lateral control and counteracts torque but is not involved in adjusting the pitch of the main rotor blades.

Thus, the swashplate is essential for pitch control, making it the correct answer.