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Flight control surfaces
Flight control surfaces are aerodynamic devices allowing a pilot to adjust and control the aircraft's flight attitude. The primary function of these is to control the aircraft's movement along the three axes of rotation. Flight control surfaces are generally operated by dedicated aircraft flight control systems.
Development of an effective set of flight control surfaces was a critical advance in the history of development of aircraft. Early efforts at fixed-wing aircraft design succeeded in generating sufficient lift to get the aircraft off the ground, however with limited control. The development of effective flight controls allowed stable flight.
A conventional fixed-wing aircraft uses three primary flight control surfaces– aileron, rudder and elevator to control the roll, yaw, and pitch respectively. Secondary flight control surfaces might include spoiler, flaps, and slats on the wings. The main control surfaces of a fixed-wing aircraft are attached to the airframe in such a way that they can perform the intended range of motion. These usually work by deflecting the air stream passing over them, to create the intended effect.
Certain fixed-wing aircraft configurations may use different control surfaces however the basic principles remain. For other airborne vehicles, these vary depending on the controls required. For rotary wing aircraft such as a helicopter, the stick and the rudder is used to accomplish the same motions about the three principal axes and the rotating flight controls such as main rotor and tail rotor disks. Certain elements are considered as a generalized fluid control surface, such as the rudders, which are shared between aircraft and watercraft.
The Wright brothers are credited with developing the first practical control surfaces, registered as a part of their patent on flying. While elevator and rudder were used to control the pitch and the yaw, early aircraft had trouble controlling the roll of the flight. The Wright brothers used wing warping, a technique where the outer trailing edges of the wing were manipulated to control the roll. However, this technique put additional pressure on the wings, making it more prone to structural failure. In an attempt to circumvent the Wrights' patent, Glenn Curtiss developed hinged movable surfaces called ailerons, attached to the wings, which helped controlling the roll of the aircraft. These hinged control surfaces have the advantage of not causing stresses that are a problem of wing warping and are easier to build into structures, and have since become a standard in fixed wing aircraft.
An aircraft is free to rotate around three axes that are perpendicular to each other and intersect at its center of gravity. To control position and direction, a pilot is required to be able to control rotation about each of them. These axes move with the aircraft and change relative to the earth as the aircraft moves. For example, for an aircraft whose left wing is pointing straight down, its "vertical" axis is parallel with the ground, while its "transverse" axis is perpendicular to the ground.
The main control surfaces of a fixed-wing aircraft are attached to the airframe on hinges or tracks so they may move and thus deflect the air stream passing over them. This redirection of the air stream generates an unbalanced force to rotate the plane about the associated axis.
Ailerons are mounted on the trailing edge of each wing near the wingtips and move in opposite directions. When the pilot moves the aileron control to the left, or turns the wheel counter-clockwise, the left aileron goes up and the right aileron goes down. A raised aileron reduces lift on that wing and a lowered one increases lift, so moving the aileron control in this way causes the left wing to drop and the right wing to rise. This causes the aircraft to roll to the left and begin to turn to the left. Centering the control returns the ailerons to the neutral position, maintaining the bank angle. The aircraft will continue to turn until opposite aileron motion returns the bank angle to zero to fly straight.
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Flight control surfaces
Flight control surfaces are aerodynamic devices allowing a pilot to adjust and control the aircraft's flight attitude. The primary function of these is to control the aircraft's movement along the three axes of rotation. Flight control surfaces are generally operated by dedicated aircraft flight control systems.
Development of an effective set of flight control surfaces was a critical advance in the history of development of aircraft. Early efforts at fixed-wing aircraft design succeeded in generating sufficient lift to get the aircraft off the ground, however with limited control. The development of effective flight controls allowed stable flight.
A conventional fixed-wing aircraft uses three primary flight control surfaces– aileron, rudder and elevator to control the roll, yaw, and pitch respectively. Secondary flight control surfaces might include spoiler, flaps, and slats on the wings. The main control surfaces of a fixed-wing aircraft are attached to the airframe in such a way that they can perform the intended range of motion. These usually work by deflecting the air stream passing over them, to create the intended effect.
Certain fixed-wing aircraft configurations may use different control surfaces however the basic principles remain. For other airborne vehicles, these vary depending on the controls required. For rotary wing aircraft such as a helicopter, the stick and the rudder is used to accomplish the same motions about the three principal axes and the rotating flight controls such as main rotor and tail rotor disks. Certain elements are considered as a generalized fluid control surface, such as the rudders, which are shared between aircraft and watercraft.
The Wright brothers are credited with developing the first practical control surfaces, registered as a part of their patent on flying. While elevator and rudder were used to control the pitch and the yaw, early aircraft had trouble controlling the roll of the flight. The Wright brothers used wing warping, a technique where the outer trailing edges of the wing were manipulated to control the roll. However, this technique put additional pressure on the wings, making it more prone to structural failure. In an attempt to circumvent the Wrights' patent, Glenn Curtiss developed hinged movable surfaces called ailerons, attached to the wings, which helped controlling the roll of the aircraft. These hinged control surfaces have the advantage of not causing stresses that are a problem of wing warping and are easier to build into structures, and have since become a standard in fixed wing aircraft.
An aircraft is free to rotate around three axes that are perpendicular to each other and intersect at its center of gravity. To control position and direction, a pilot is required to be able to control rotation about each of them. These axes move with the aircraft and change relative to the earth as the aircraft moves. For example, for an aircraft whose left wing is pointing straight down, its "vertical" axis is parallel with the ground, while its "transverse" axis is perpendicular to the ground.
The main control surfaces of a fixed-wing aircraft are attached to the airframe on hinges or tracks so they may move and thus deflect the air stream passing over them. This redirection of the air stream generates an unbalanced force to rotate the plane about the associated axis.
Ailerons are mounted on the trailing edge of each wing near the wingtips and move in opposite directions. When the pilot moves the aileron control to the left, or turns the wheel counter-clockwise, the left aileron goes up and the right aileron goes down. A raised aileron reduces lift on that wing and a lowered one increases lift, so moving the aileron control in this way causes the left wing to drop and the right wing to rise. This causes the aircraft to roll to the left and begin to turn to the left. Centering the control returns the ailerons to the neutral position, maintaining the bank angle. The aircraft will continue to turn until opposite aileron motion returns the bank angle to zero to fly straight.