What is the role of the tension torsion strap (TT strap) in a rotor system?

• A. To provide structural support
• B. To facilitate pitch control
• C. To connect the rotor blades to the hub
• D. To absorb vibrations

Answer: (C)

The tension torsion strap, often referred to as the TT strap, plays a crucial role in connecting the rotor blades to the hub in a rotor system. This component is essential because it ensures that the rotor blades are securely attached to the rotor assembly while allowing for the necessary movement and flexibility during operation.

In a rotor system, the connection between the blades and the hub must withstand significant forces and strains during flight. The TT strap is designed to handle these forces by providing a stable connection that maintains the alignment and integrity of the rotor blades while accommodating the dynamics of rotor motion. This allows for proper aerodynamic performance and contributes to the overall efficiency and safety of the rotorcraft.

The other options focus on various functions within a rotor system, such as providing structural support, facilitating pitch control, or absorbing vibrations. While these roles are important in different contexts within the rotor mechanics, they do not accurately describe the primary function of the TT strap, which is specifically to maintain the connection between the rotor blades and the hub.