What does the flexible neck in a rotor blade enable?

• A. Increased durability
• B. Reduction of weight
• C. Ability for blade flapping
• D. Improved aerodynamics

Answer: (C)

The flexible neck in a rotor blade is designed to allow for blade flapping, which is crucial for the performance and efficiency of rotor systems. When a rotor blade rotates, it experiences various aerodynamic forces that can cause it to flex or flap. This flexibility is essential for adapting to changing load conditions during flight, enabling the rotor blade to optimize its angle of attack and maintain lift.

Blade flapping also helps to distribute the mechanical stresses that occur during operation, reducing the likelihood of structural failure. By accommodating these changes, the flexible neck contributes to the overall functionality and stability of the rotor system, making it an integral feature for efficient lift generation and flight performance.