Existing comment:
Compensating for Unbalanced Lift:
Blades advancing in the direction of flight move faster relative to the air than rearward retreating blades. This creates unbalanced lift. To equalize lift, reduce gyroscopic effects, and relieve blade stress, the blades must be able to flap. Retreating blade stall (disruption of lift) limits most rotorcraft to speeds less than 320 kilometers (200 miles) per hour. |