Which component transmits the centrifugal forces from the rotor blades to the main rotor hub?

• A. Gearbox
• B. Blade pitch control
• C. Tension torsion strap (TT strap)
• D. Yaw control mechanism

Answer: (C)

The tension torsion strap (TT strap) is the key component responsible for transmitting the centrifugal forces generated by the rotor blades to the main rotor hub. This strap is designed to manage both the tension and torsion experienced during rotor operation, ensuring that the forces are effectively transferred without compromising the structural integrity of the rotor system.

When the rotor blades spin, they generate significant centrifugal forces due to their mass and rotational speed. The TT strap connects to the main rotor hub, allowing these forces to be transmitted efficiently. Its design is crucial in maintaining the proper blade alignment and stability during flight, which ultimately contributes to the safe and efficient operation of the helicopter.

Other components listed, like the gearbox, primarily handle power transfer from the engine to the rotor system and are not directly involved in force transmission from the blades to the hub. The blade pitch control mechanism adjusts the angle of the rotor blades to optimize lift and control but does not transmit forces. The yaw control mechanism is responsible for controlling the helicopter's rotation around its vertical axis, unrelated to the transmission of centrifugal forces from the rotor blades to the hub.