Which component controls the rotor blade of a helicopter?

The rotor blades of a helicopter are controlled by various components that manage different aspects of flight. The collective and cyclic controls play vital roles in rotor blade adjustments.

The collective control changes the pitch angle of all rotor blades simultaneously. This adjustment allows the helicopter to gain or lose altitude — pulling up on the collective increases lift, while pushing it down decreases lift.

The cyclic control allows the pilot to alter the pitch of the rotor blades individually during their rotation. This provides lateral control, enabling the helicopter to tilt and move in the desired direction by adjusting the lift on one side of the rotor disc, which gives the helicopter the ability to move forward, backward, or sideways.

The throttle is primarily used to control the engine's power output, which indirectly affects rotor speed and performance but does not directly control blade pitch.

Therefore, recognizing that the rotor blade is influenced by the collective and cyclic controls, along with the throttle affecting overall performance, makes understanding that all three components play a role in rotor control essential. Consequently, all of these components are integral to helicopter flight control, which justifies the selection of all of the options as pertinent to rotor blade control.