What does the “flapping” motion of rotor blades help achieve during flight?

The “flapping” motion of rotor blades plays a crucial role in creating lift and maintaining balance during flight. As the rotor blades rotate, they need to adapt to changes in air pressure and weight distribution caused by the helicopter’s movement and external factors such as wind. The flapping motion allows rotor blades to effectively adjust their angle of attack relative to the oncoming airflow, which is vital for generating lift.

When a rotor blade flaps upward, the angle of attack decreases, reducing lift on that side and helping to balance the helicopter. Conversely, when the blade flaps downward, the angle of attack increases, raising the lift on that side. This dynamic adjustment helps counteract the effects of cyclic loading and ensures that the helicopter remains stable and level during flight. The interplay of these forces is essential for efficient flight control and overall operational performance.

In summary, flapping is a key function that enables rotor blades to create lift while maintaining balance, thereby facilitating stable flight.