Which component picture corresponds to the Main Rotor Head?

• A. Main Rotor Blade
• B. Main Transmission
• C. Rotor Brake System
• D. Main Rotor Head

Answer: (D)

The main rotor head is the hub that holds all the rotor blades and provides the pivot and linkage for changing blade pitch. In diagrams, it looks like the central circular hub with multiple arms or arms connected to each blade root and the control linkages to the pitch horns. This is the part where blades attach to the mast and where cyclic and collective inputs move the blades collectively.

So, the picture that shows a central hub with blade roots and linkages attached to each blade is the one that represents the main rotor head. The other components are the blade itself, the gearbox/engine-driven main transmission, and the rotor braking assembly, which look different from the hub with its control linkages.