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Aircraft principal axes

This article is about yaw, pitch, and roll as symmetry axes of a plane. For meaning in mechanics, see Moment of inertia § Principal axes of inertia. For Euler angles with the same names, see Euler angles § Tait–Bryan angles.

An aircraft in flight is free to rotate in three dimensions: yaw, nose left or right about an axis running up and down; pitch, nose up or down about an axis running from wing to wing; and roll, rotation about an axis running from nose to tail. The axes are alternatively designated as vertical, lateral (or transverse), and longitudinal respectively. These axes move with the vehicle and rotate relative to the Earth along with the craft. These definitions were analogously applied to spacecraft when the first manned spacecraft were designed in the late 1950s.

The position of all three axes, with the right-hand rule for describing the angle of its rotations

These rotations are produced by torques (or moments) about the principal axes. On an aircraft, these are intentionally produced by means of moving control surfaces, which vary the distribution of the net aerodynamic force about the vehicle's center of gravity. Elevators (moving flaps on the horizontal tail) produce pitch, a rudder on the vertical tail produces yaw, and ailerons (flaps on the wings that move in opposing directions) produce roll. On a spacecraft, the moments are usually produced by a reaction control system consisting of small rocket thrusters used to apply asymmetrical thrust on the vehicle.

Contents

See also: Ship motions
Yaw/heading, pitch and roll angles and associated vertical (down), transverse and longitudinal axes
  • Normal axis, or yaw axis — an axis drawn from top to bottom, and perpendicular to the other two axes, parallel to the fuselage station.
  • Transverse axis, lateral axis, or pitch axis — an axis running from the pilot's left to right in piloted aircraft, and parallel to the wings of a winged aircraft, parallel to the buttock line.
  • Longitudinal axis, or roll axis — an axis drawn through the body of the vehicle from tail to nose in the normal direction of flight, or the direction the pilot faces, similar to a ship's waterline.

Normally, these axes are represented by the letters X, Y and Z in order to compare them with some reference frame, usually named x, y, z. Normally, this is made in such a way that the X is used for the longitudinal axis, but there are other possibilities to do it.

Vertical axis (yaw)

The yaw axis has its origin at the center of gravity and is directed towards the bottom of the aircraft, perpendicular to the wings and to the fuselage reference line. Motion about this axis is called yaw. A positive yawing motion moves the nose of the aircraft to the right. The rudder is the primary control of yaw.

The term yaw was originally applied in sailing, and referred to the motion of an unsteady ship rotating about its vertical axis. Its etymology is uncertain.

Transverse axis (pitch)

The pitch axis (also called transverse or lateral axis) has its origin at the center of gravity and is directed to the right, parallel to a line drawn from wingtip to wingtip. Motion about this axis is called pitch. A positive pitching motion raises the nose of the aircraft and lowers the tail. The elevators are the primary control of pitch.

Longitudinal axis (roll)

The roll axis (or longitudinal axis) has its origin at the center of gravity and is directed forward, parallel to the fuselage reference line. Motion about this axis is called roll. An angular displacement about this axis is called bank. A positive rolling motion lifts the left wing and lowers the right wing. The pilot rolls by increasing the lift on one wing and decreasing it on the other. This changes the bank angle. The ailerons are the primary control of bank. The rudder also has a secondary effect on bank.

These axes are related to the principal axes of inertia, but are not the same. They are geometrical symmetry axes, regardless of the mass distribution of the aircraft.[citation needed]

In aeronautical and aerospace engineering intrinsic rotations around these axes are often called Euler angles, but this conflicts with existing usage elsewhere. The calculus behind them is similar to the Frenet–Serret formulas. Performing a rotation in an intrinsic reference frame is equivalent to right-multiplying its characteristic matrix (the matrix that has the vectors of the reference frame as columns) by the matrix of the rotation.[citation needed]

The first aircraft to demonstrate active control about all three axes was the Wright brothers' 1902 glider.

  1. "Yaw axis". Retrieved2008-07-31.
  2. "Specialty Definition: YAW AXIS". Archived from the original on 2012-10-08. Retrieved2008-07-31.
  3. Clancy, L.J. (1975) Aerodynamics Pitman Publishing Limited, London ISBN 0-273-01120-0, Section 16.6
  4. "Online Etymology Dictionary". Retrieved22 October 2020.
  5. "MISB Standard 0601"(PDF). Motion Imagery Standards Board (MISB). Retrieved1 May 2015. Also at .
  6. FAA (2004). Airplane Flying Handbook. Washington D.C.:U.S. Department of Transportation, Federal Aviation Administration, ch 4, p 2, FAA-8083-3A.
  7. "Aircraft rotations". Archived from the original on 4 July 2008. Retrieved2008-08-04.

Aircraft principal axes
Aircraft principal axes Language Watch Edit 160 160 Redirected from Yaw axis This article is about yaw pitch and roll as symmetry axes of a plane For meaning in mechanics see Moment of inertia Principal axes of inertia For Euler angles with the same names see Euler angles Tait Bryan angles An aircraft in flight is free to rotate in three dimensions yaw nose left or right about an axis running up and down pitch nose up or down about an axis running from wing to wing and roll rotation about an axis running from nose to tail The axes are alternatively designated as vertical lateral or transverse and longitudinal respectively These axes move with the vehicle and rotate relative to the Earth along with the craft These definitions were analogously applied to spacecraft when the first manned spacecraft were designed in the late 1950s The position of all three axes with the right hand rule for describing the angle of its rotations These rotations are produced by torques or moments about the principal axes On an aircraft these are intentionally produced by means of moving control surfaces which vary the distribution of the net aerodynamic force about the vehicle s center of gravity Elevators moving flaps on the horizontal tail produce pitch a rudder on the vertical tail produces yaw and ailerons flaps on the wings that move in opposing directions produce roll On a spacecraft the moments are usually produced by a reaction control system consisting of small rocket thrusters used to apply asymmetrical thrust on the vehicle Contents 1 Principal axes 1 1 Vertical axis yaw 1 2 Transverse axis pitch 1 3 Longitudinal axis roll 2 Relationship with other systems of axes 3 History 4 See also 5 References 6 External linksPrincipal axes EditSee also Ship motions Yaw heading pitch and roll angles and associated vertical down transverse and longitudinal axes Normal axis or yaw axis an axis drawn from top to bottom and perpendicular to the other two axes parallel to the fuselage station Transverse axis lateral axis or pitch axis an axis running from the pilot s left to right in piloted aircraft and parallel to the wings of a winged aircraft parallel to the buttock line Longitudinal axis or roll axis an axis drawn through the body of the vehicle from tail to nose in the normal direction of flight or the direction the pilot faces similar to a ship s waterline Normally these axes are represented by the letters X Y and Z in order to compare them with some reference frame usually named x y z Normally this is made in such a way that the X is used for the longitudinal axis but there are other possibilities to do it Vertical axis yaw Edit The yaw axis has its origin at the center of gravity and is directed towards the bottom of the aircraft perpendicular to the wings and to the fuselage reference line Motion about this axis is called yaw A positive yawing motion moves the nose of the aircraft to the right 1 2 The rudder is the primary control of yaw 3 The term yaw was originally applied in sailing and referred to the motion of an unsteady ship rotating about its vertical axis Its etymology is uncertain 4 Transverse axis pitch Edit The pitch axis also called transverse or lateral axis 5 has its origin at the center of gravity and is directed to the right parallel to a line drawn from wingtip to wingtip Motion about this axis is called pitch A positive pitching motion raises the nose of the aircraft and lowers the tail The elevators are the primary control of pitch 3 Longitudinal axis roll Edit The roll axis or longitudinal axis 5 has its origin at the center of gravity and is directed forward parallel to the fuselage reference line Motion about this axis is called roll An angular displacement about this axis is called bank 3 A positive rolling motion lifts the left wing and lowers the right wing The pilot rolls by increasing the lift on one wing and decreasing it on the other This changes the bank angle The ailerons are the primary control of bank The rudder also has a secondary effect on bank 6 Relationship with other systems of axes EditThese axes are related to the principal axes of inertia but are not the same They are geometrical symmetry axes regardless of the mass distribution of the aircraft citation needed In aeronautical and aerospace engineering intrinsic rotations around these axes are often called Euler angles but this conflicts with existing usage elsewhere The calculus behind them is similar to the Frenet Serret formulas Performing a rotation in an intrinsic reference frame is equivalent to right multiplying its characteristic matrix the matrix that has the vectors of the reference frame as columns by the matrix of the rotation citation needed History EditThe first aircraft to demonstrate active control about all three axes was the Wright brothers 1902 glider 7 See also EditAerodynamics Aircraft flight control system Euler angles Fixed wing aircraft Flight control surfaces Flight dynamics Flight dynamics fixed wing aircraft Moving frame Panning camera Six degrees of freedom Screw theory Triad methodReferences Edit Yaw axis Retrieved 2008 07 31 Specialty Definition YAW AXIS Archived from the original on 2012 10 08 Retrieved 2008 07 31 a b c Clancy L J 1975 Aerodynamics Pitman Publishing Limited London ISBN 0 273 01120 0 Section 16 6 Online Etymology Dictionary Retrieved 22 October 2020 a b MISB Standard 0601 PDF Motion Imagery Standards Board MISB Retrieved 1 May 2015 Also at File MISB Standard 0601 pdf FAA 2004 Airplane Flying Handbook Washington D C U S Department of Transportation Federal Aviation Administration ch 4 p 2 FAA 8083 3A Aircraft rotations Archived from the original on 4 July 2008 Retrieved 2008 08 04 External links EditYaw Axis Control as a Means of Improving V STOL Aircraft Performance 3D fast walking simulation of biped robot by yaw axis moment compensation Flight control system for a hybrid aircraft in the yaw axis Retrieved from https en wikipedia org w index php title Aircraft principal axes amp oldid 1053332050 Vertical axis yaw, wikipedia, wiki, book,

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