Which term describes the area swept by the rotor blades?

Which term describes the area swept by the rotor blades?

• A. Rotor Disk Area
• B. Disk Sweep
• C. Rotor Circle
• D. Blade Sweep

Answer: (A)

The area swept by the rotor blades is called the rotor disk area. When the rotor spins, each blade traces out a circular path, and the union of all those paths forms a circular disk defined by the rotor’s radius. This disk represents the space the rotor occupies and is used in calculations like disk loading. Other terms aren’t standard or describe a different idea—the blade’s motion itself (blade sweep) isn’t the same as the entire swept area, and “rotor circle” or “disk sweep” aren’t the accepted terms for this concept.

The area swept by the rotor blades is called the rotor disk area. When the rotor spins, each blade traces out a circular path, and the union of all those paths forms a circular disk defined by the rotor’s radius. This disk represents the space the rotor occupies and is used in calculations like disk loading. Other terms aren’t standard or describe a different idea—the blade’s motion itself (blade sweep) isn’t the same as the entire swept area, and “rotor circle” or “disk sweep” aren’t the accepted terms for this concept.