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What is main rotor system?

A helicopter main rotor or rotor system is the combination of several rotary wings (rotor blades) and a control system that generates the aerodynamic lift force that supports the weight of the helicopter, and the thrust that counteracts aerodynamic drag in forward flight.


Thereof, what is a semi rigid rotor system?

A semirigid main rotor is always a 2 bladed rotor system. It gets its name from the fact that it does not have a lead-lag hinge, the way a fully articulated rotor system does. Therefore the rotor is not rigid, but not fully articulated either, so we call it semirigid.

Secondly, why do helicopters have 2 rotors? Having two coaxial sets of rotors provides symmetry of forces around the central axis for lifting the vehicle and laterally when flying in any direction. Because of the mechanical complexity, many helicopter designs use alternate configurations to avoid problems that arise when only one rotor is used.

Regarding this, how do rotor blades work?

Unlike airplanes, helicopters feature spinning wings called blades or rotors on top. As a helicopter’s blades spin, they create a force called lift that allows the helicopter to rise into the air. The rear rotor can face different directions, allowing the helicopter to move forward, backward, and sideways.

How is the pitch of the rotor blades changed in a rigid rotor system?

By changing the pitch angle of the blades you can control the thrust and direction of the main rotor disc. In a rigid rotor system, the blades, hub, and mast are rigid with respect to each other. There are no vertical or horizontal hinges so the blades cannot flap or drag, but they can be feathered.


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