What term describes the area swept by the blades of the rotor, forming a circle with its center at the hub and a radius equal to one blade length?

What term describes the area swept by the blades of the rotor, forming a circle with its center at the hub and a radius equal to one blade length?

• A. Disk Area
• B. Disk Loading
• C. Dynamic Rollover
• D. Feathering

Answer: (A)

The area describes the circle traced by the rotor blades as they spin, with the circle’s center at the hub and a radius equal to the blade length. This geometric region is called the disk area. It represents the space the blades sweep through during rotation and is a fundamental measure used in performance calculations, such as disk loading, which relates weight to this disk area. The other terms refer to different ideas: disk loading is a ratio of weight to disk area, dynamic rollover is a stability concern during hover or takeoff, and feathering describes adjusting blade pitch to influence thrust and drag.

The area describes the circle traced by the rotor blades as they spin, with the circle’s center at the hub and a radius equal to the blade length. This geometric region is called the disk area. It represents the space the blades sweep through during rotation and is a fundamental measure used in performance calculations, such as disk loading, which relates weight to this disk area. The other terms refer to different ideas: disk loading is a ratio of weight to disk area, dynamic rollover is a stability concern during hover or takeoff, and feathering describes adjusting blade pitch to influence thrust and drag.