NASA Logo - Web Link to NASA.gov Vertical Line

+ Text Only Site
+ Non-Flash Version
+ Contact Glenn

Go
ABOUT NASA NEWS AND EVENTS MULTIMEDIA MISSIONS MyNASA WORK FOR NASA
Computer drawing of kids page link
This page is intended for college, high school, or middle school students. For younger students, a simpler explanation of the information on this page is available on the Kid's Page. Click Here for a description of flight control, or Here for a discussion of airplane parts.

Computer drawing of an airliner showing the aileron deflections
 to produce a rolling motion.

Ailerons can be used to generate a rolling motion for an aircraft. Ailerons are small hinged sections on the outboard portion of a wing. Ailerons usually work in opposition: as the right aileron is deflected upward, the left is deflected downward, and vice versa. This slide shows what happens when the pilot deflects the right aileron upwards and the left aileron downwards.

The ailerons are used to bank the aircraft; to cause one wing tip to move up and the other wing tip to move down. The banking creates an unbalanced side force component of the large wing lift force which causes the aircraft's flight path to curve. (Airplanes turn because of banking created by the ailerons, not because of a rudder input.

The ailerons work by changing the effective shape of the airfoil of the outer portion of the wing. As described on the shape effects slide, changing the angle of deflection at the rear of an airfoil will change the amount of lift generated by the foil. With greater downward deflection, the lift will increase in the upward direction. Notice on this slide that the aileron on the left wing, as viewed from the rear of the aircraft, is deflected down. The aileron on the right wing is deflected up. Therefore, the lift on the left wing is increased, while the lift on the right wing is decreased. For both wings, the lift force (Fr or Fl) of the wing section through the aileron is applied at the aerodynamic center of the section which is some distance (L) from the aircraft center of gravity. This creates a torque

T = F * L

about the center of gravity. If the forces (and distances) are equal there is no net torque on the aircraft. But if the forces are unequal, there is a net torque and the aircraft rotates about its center of gravity. For the conditions shown in the figure, the resulting motion will roll the aircraft to the right (clockwise) as viewed from the rear. If the pilot reverses the aileron deflections (right aileron down, left aileron up) the aircraft will roll in the opposite direction. We have chosen to name the left wing and right wing based on a view from the back of the aircraft towards the nose, because that is the direction in which the pilot is looking.

Let's investigate how the ailerons work by using a Java simulator.

You can change the aileron setting by using the slider at the bottom.

You can download your own copy of this simulator for use off line. The program is provided as Roll.zip. You must save this file on your hard drive and "Extract" the necessary files from Roll.zip. Click on "Rollview.html" to launch your browser and load the program.

Button to Download a Copy of the Program

[You can also test the roll effect yourself using a paper airplane. Just cut some control tabs into the rear of both wings. Bend one tab up and the other down, and you will see the airplane roll when it is flown. The roll will be in the direction of the tab that is pulled up. The same thing will work on a simple wooden glider. The tabs can be yellow stick-ums or tape attached to the wings.]

When you travel on an airliner, watch the wings during turns. The pilot rolls the aircraft in the direction of the turn. You will probably be surprised at how little deflection is necessary to bank (roll) a large airliner. But be warned that there is a possible source of confusion on some airliners. We have been talking here about rolling the aircraft by using a pair of ailerons at the very trailing edge of both wings to increase or decrease the lift of each wing. On some airliners, the aircraft is rolled by killing the lift on only one wing at a time. A plate, called a spoiler, is raised between the leading and trailing edges of the wing. This effectively changes the shape of the airfoil, disrupts the flow over the wing, and causes a section of the wing to decrease its lift. This produces an unbalanced force with the other wing, which causes the roll. Airliners use spoilers because spoilers can react more quickly than ailerons and require less force to activate, but they always decrease the total amount of lift for the aircraft. It's an interesting trade! You can tell whether an airliner is using spoilers or ailerons by noticing where the moving part is located. At the trailing edge, it's an aileron; between the leading and trailing edges, it's a spoiler. (Now you can dazzle the person sitting next to you on the plane!)

You can view a short movie of "Orville and Wilbur Wright" explaining how wing warping was used to roll their aircraft. The movie file can be saved to your computer and viewed as a Podcast on your podcast player.


Activities:
Button to Display Grade 6-8 Activity Button to Display Grade 6-8 Activity Button to Display Grade 6-8 Activity Button to Display Grade 9-12 Activity Button to Display Grade 11-12 Activity
Guided Tours
  • Button to Display Previous Page Parts of an Airplane: Button to Display Next Page
  • Button to Display Previous Page Control Surfaces: Button to Display Next Page
  • Button to Display Previous Page Ailerons: Button to Display Next Page
  • Button to Display Previous Page Aircraft Roll Motion: Button to Display Next Page
  • Button to Display Previous Page Banking Turn: Button to Display Next Page


Navigation ..

Button to Display Aerodynamics Index Button to Display Wright Brothers Index
Beginner's Guide Home Page

 

     First Gov Image


+ Inspector General Hotline
+ Equal Employment Opportunity Data Posted Pursuant to the No Fear Act
+ Budgets, Strategic Plans and Accountability Reports
+ Freedom of Information Act
+ The President's Management Agenda
+ NASA Privacy Statement, Disclaimer,
and Accessibility Certification

 

NASA Logo   
Editor: Tom Benson
NASA Official: Tom Benson
Last Updated: Sep 13 2010

+ Contact Glenn