What is the primary function of the swashplate in a helicopter rotor system?

• A. To provide lift
• B. To convert linear inputs into rotary commands
• C. To balance rotor blades
• D. To dampen vibrations

Answer: (B)

The primary function of the swashplate in a helicopter rotor system is to convert linear inputs from the pilot's flight controls into rotary commands for the rotor blades. The swashplate consists of two main components: the stationary swashplate and the rotating swashplate. When the pilot moves the flight controls, it causes the stationary portion of the swashplate to tilt, which in turn changes the angle of the blades as they rotate around the rotor hub. This adjustment allows the rotor blades to change their pitch, thereby affecting lift and control. The swashplate mechanism is crucial for maneuverability, enabling the helicopter to perform various flight maneuvers such as ascending, descending, turning, and forward flight.

The other options represent functions or characteristics associated with helicopter flight but do not accurately describe the primary role of the swashplate. For instance, while the rotor system does provide lift when its blades rotate, this is not the direct function of the swashplate itself. Balancing rotor blades and dampening vibrations also involve different mechanisms and components within the rotor system, such as blade controls and dampers, rather than the swashplate.