One revolution of a main rotor blade (MRB) is described as which type of pitch?

• A. Cyclic pitch
• B. Blade rotation
• C. Pitch angle
• D. Rotor cycle

Answer: (A)

Cyclic pitch is the term for how a blade’s pitch angle varies as it sweeps around the rotor disk during each revolution. As a rotor blade makes a full turn, the pilot’s cyclic input causes the blade’s angle of attack to change with azimuth, producing different lift on different parts of the disk. This repeating variation over every revolution tilts the rotor plane and moves the helicopter in the desired direction. The other options don’t describe a pitch variation tied to the blade’s position around the circle: blade rotation is the motion itself, pitch angle is just a single angle value, and rotor cycle isn’t the standard term used for this concept.