![]() ![]() Thus, If the pilot pushes the cyclic forward, the rotor disk tilts forward, and the helicopter is drawn straight ahead. If that point is dead ahead, the blade pitch increases briefly in that direction. The pitch is changed so that each blade will have the same angle of incidence as it passes the same point in the cycle, changing the lift generated by the blade at that point and causing each blade to change its angle of incidence, that is, to rotate slightly along its long axis, in sequence as it passes the same point. ![]() The control is called the cyclic because it independently changes the mechanical pitch angle or feathering angle of each main rotor blade according to its position in the cycle. During forward flight, the cyclic control inputs cause flight path changes similar to fixed-wing aircraft flight left or right inputs cause the helicopter to roll into a turn in the desired direction, and forward and back inputs change the pitch attitude of the helicopter resulting in altitude changes (climbing or descending flight). In a hover, the cyclic controls the movement of the helicopter forward, back, and laterally. The cyclic is used to control the main rotor in order to change the helicopter's direction of movement. Helicopters with fly-by-wire systems allow a cyclic-style controller to be mounted to the side of the pilot seat. The Robinson R22 has a "teetering" cyclic design connected to a central column located between the two seats. The cyclic stick commonly rises up from beneath the front of each pilot's seat. The cyclic control, commonly called the cyclic stick or just cyclic, is similar in appearance on most helicopters to a control stick from a conventional aircraft. The governors also help the pilot control the collective pitch on the helicopter's main rotors, to keep a stable, more accurate flight.Ĭontrols Cyclic Cyclic control in a H145 The manual throttle may also be considered a flight control because it is needed to maintain rotor speed on smaller helicopters without governors. Depending on the complexity of the helicopter, the cyclic and collective may be linked together by a mixing unit, a mechanical or hydraulic device that combines the inputs from both and then sends along the "mixed" input to the control surfaces to achieve the desired result. To increase or decrease overall lift requires that the controls alter the angle of attack for all blades collectively by equal amounts at the same time, resulting in ascent, descent, acceleration and deceleration.Ī typical helicopter has three flight control inputs: the cyclic stick, the collective lever, and the anti-torque pedals. ![]() To tilt forward and back (pitch) or sideways (roll) requires that the controls alter the angle of attack of the main rotor blades cyclically during rotation, creating differing amounts of lift at different points in the cycle. Changes to the aircraft flight control system transmit mechanically to the rotor, producing aerodynamic effects on the rotor blades that make the helicopter move in a desired way. Helicopter flight controls are used to achieve and maintain controlled aerodynamic helicopter flight. Location of flight controls in a helicopter JSTOR ( June 2009) ( Learn how and when to remove this template message).Unsourced material may be challenged and removed.įind sources: "Helicopter flight controls" – news ![]() Please help improve this article by adding citations to reliable sources. This article needs additional citations for verification. ![]()
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