How does the swash plate work on a helicopter?

How does the swash plate work on a helicopter?

The rotating swashplate is mounted on the stationary swashplate by means of a bearing, and is allowed to rotate with the main rotor mast. A swashplate mechanism controls the cyclic and collective pitch of the rotor blades. The cyclic pitch of the rotor blades is used to change a helicopter’s roll and pitch.

How does a helicopter move forward?

The rotor blades are pitched lower in the front of the rotor assembly than behind it. This increases the angle of attack — and creates lift — at the back of the helicopter. The unbalanced lift causes the helicopter to tip forward and move in that direction.

What is the function of swash plate?

A swashplate is a device that translates input via the helicopter flight controls into motion of the main rotor blades. Because the main rotor blades are spinning, the swashplate is used to transmit three of the pilot’s commands from the non-rotating fuselage to the rotating rotor hub and mainblades.

What happens the collective pitch control is raised?

As the collective pitch control is raised, there is a simultaneous and equal increase in pitch angle of all main rotor blades; as it is lowered, there is a simultaneous and equal decrease in pitch angle. As the pitch angle increases, angle of incidence increases, drag increases, and rotor rpm decreases.

How does a swashplate work in a helicopter?

The swashplate is designed to take the servo inputs that are based on the pilot’s pitch, roll, and collective commands and translate them to individual blade pitch inputs. There are many different servo arrangements for both three and four servo swashplates.

How is the pitch of a helicopter controlled?

How Helicopters Work. Cyclic-pitch lever — A helicopter pilot controls the pitch, or angle, of the rotor blades with two inputs: the cyclic- and collective-pitch levers, often just shortened to the cyclic and the collective. The cyclic, or “stick,” comes out of the floor of the cockpit and sits between the pilot’s legs,…

How does a helicopter’s cyclic and longitudinal control work?

The helicopter in OP picture shows unmixed inputs into the swash plate: tilt swashplate forward for longitudinal control, sideways for lateral control, pedals connected to tail rotor only. Picture below is from Principles of Helicopter Aerodynamics by Leishman, and shows a schematic of the cyclic longitudinal

How is collective control used in helicopter aviation?

The control is provided because during startup and shutdown the collective has a tendance to raise to the up position all on it’s own. The friction is used to hold the collective down during these times. The green arrow points to the starter button, which is on the end of the collective.