Which control changes the pitch of each rotor blade individually as it passes through one rotation to tilt the rotor disc and control horizontal movement?

Which control changes the pitch of each rotor blade individually as it passes through one rotation to tilt the rotor disc and control horizontal movement?

• A. Collective Pitch Control
• B. Cyclic Pitch Control
• C. Delta Hinge
• D. Deviation

Answer: (B)

Cyclic pitch control is used to tilt the rotor disc and produce horizontal movement by varying the pitch of each rotor blade as it passes through different parts of the rotation. By inputting cyclic, the blade ahead of the hub is pitched to generate more lift while the blade behind is pitched to generate less lift as they reach their respective azimuth positions. This time-varying lift around the rotor circle tilts the disc in the direction you want, creating forward, backward, or lateral movement. In contrast, collective pitch changes the pitch of all blades uniformly to increase or decrease total lift, affecting vertical ascent or descent rather than tilting the rotor disc. The delta hinge is a structural feature of some rotor hubs and isn’t a pilot-control that alters blade pitch around the rotation. Deviation isn’t a control used to steer the helicopter.

Cyclic pitch control is used to tilt the rotor disc and produce horizontal movement by varying the pitch of each rotor blade as it passes through different parts of the rotation. By inputting cyclic, the blade ahead of the hub is pitched to generate more lift while the blade behind is pitched to generate less lift as they reach their respective azimuth positions. This time-varying lift around the rotor circle tilts the disc in the direction you want, creating forward, backward, or lateral movement.

In contrast, collective pitch changes the pitch of all blades uniformly to increase or decrease total lift, affecting vertical ascent or descent rather than tilting the rotor disc. The delta hinge is a structural feature of some rotor hubs and isn’t a pilot-control that alters blade pitch around the rotation. Deviation isn’t a control used to steer the helicopter.