What term denotes the action that changes the pitch angle of the rotor blades by rotating them around the feathering axis?

What term denotes the action that changes the pitch angle of the rotor blades by rotating them around the feathering axis?

• A. Feathering
• B. Feathering Axis
• C. Direct Shaft Turbine
• D. Disk Loading

Answer: (A)

Feathering is the action of changing the rotor blade pitch by rotating the blade around the feathering axis. This axis is the line about which the blade pitch is adjusted, so moving the blade about it changes the angle of attack and, therefore, lift and drag. The collective control activates the pitch-change mechanism to rotate each blade around this axis, producing a uniform pitch change for all blades. The other terms either name the axis itself, refer to a component of the engine, or describe a performance concept, but none describe the act of changing blade pitch.

Feathering is the action of changing the rotor blade pitch by rotating the blade around the feathering axis. This axis is the line about which the blade pitch is adjusted, so moving the blade about it changes the angle of attack and, therefore, lift and drag. The collective control activates the pitch-change mechanism to rotate each blade around this axis, producing a uniform pitch change for all blades. The other terms either name the axis itself, refer to a component of the engine, or describe a performance concept, but none describe the act of changing blade pitch.