Which component provides adjustability of the main rotor?

• A. Swashplate
• B. Tail Rotor Head
• C. Dampers
• D. Pitch Control Rods

Answer: (A)

The ability to change the main rotor blade pitch is provided by the swashplate. The swashplate assembly is designed to translate the pilot’s cyclic and collective commands into pitch changes across all rotor blades as the rotor spins. It has two parts: a stationary portion that receives inputs from the cockpit via pitch control rods and a rotating portion that tilts and moves with the rotor head. This setup allows both cyclic pitch (varying pitch around the rotor disk to tilt the rotor plane) and collective pitch (changing pitch uniformly across all blades) to be applied precisely as the rotor turns.

The other components have different roles. The tail rotor head controls yaw and anti-torque, not main rotor blade pitch. Dampers mainly absorb vibration and smooth out rotor motion. Pitch control rods are the linkages that convey the pilot’s inputs to the swashplate; they don’t directly adjust blade pitch themselves without the swashplate translating their movement. So the swashplate is the mechanism that enables the actual adjustability of the main rotor pitch.