What term describes an upward sweep of rotor blades as a result of lift and centrifugal force?

What term describes an upward sweep of rotor blades as a result of lift and centrifugal force?

• A. Blade Coning
• B. Blade Damper
• C. Blade Feather or Feathering
• D. Axis of Rotation

Answer: (A)

Blade coning is the upward bend of rotor blades that happens as the rotor spins. As each blade experiences centrifugal force pulling it outward and aerodynamic lift acting on its airfoil, the blade deflects upward relative to the plane of the hub. The combined effect causes the blades to rise toward the tip, forming a cone shape rather than lying flat. This coning is a normal, expected behavior at operating RPMs and weight, and rotor systems are designed with it in mind. Other terms describe different concepts: a blade damper reduces vibration, blade feathering changes pitch to minimize drag, and the axis of rotation is simply the line the rotor spins around.

Blade coning is the upward bend of rotor blades that happens as the rotor spins. As each blade experiences centrifugal force pulling it outward and aerodynamic lift acting on its airfoil, the blade deflects upward relative to the plane of the hub. The combined effect causes the blades to rise toward the tip, forming a cone shape rather than lying flat. This coning is a normal, expected behavior at operating RPMs and weight, and rotor systems are designed with it in mind. Other terms describe different concepts: a blade damper reduces vibration, blade feathering changes pitch to minimize drag, and the axis of rotation is simply the line the rotor spins around.