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Spoilers are frequently fitted to race and high-performance sports cars, although they have also become common on passenger vehicles. Spoilers are added to cars primarily for styling and either have little aerodynamic benefit or worsen the aerodynamics. The term "spoiler" is often mistakenly used interchangeably with "wing".
Spoilerons roll an aircraft by reducing the lift of the downward-going wing.Unlike ailerons, spoilers do not increase the lift and drag of the upward-going wing. A raised spoileron increases the drag on the down-going wing where it is deployed, causing the aircraft to yaw in the direction of the turn.
In aeronautics, a spoiler (sometimes called a lift spoiler or lift dumper) is a device which increases the drag and decreases the lift of an airfoil in a controlled way. Most often, spoilers are hinged plates on the top surface of a wing that can be extended upward into the airflow to spoil the streamline flow.
The ailerons are the primary control of bank, especially on smaller aircraft: larger aircraft often use roll spoilers or spoilerons on the upper wing surface to reduce lift on one wing to aid rolling. The rudder also has a secondary effect on bank through moving one wing forward and the other backwards, affecting the lift they produce.
Often, characteristics of both spoilers and air brakes are desirable and are combined - most modern airliner jets feature combined spoiler and air brake controls. On landing, the deployment of these spoilers ("lift dumpers") causes a significant reduction in wing lift, so the weight of the aircraft is transferred from the wings to the undercarriage.
Spoilers are intended to create drag and reduce lift by "spoiling" the airflow over the wing. A spoiler is much larger than a Gurney flap, and can be retracted. Spoilers are usually installed mid chord on the upper surface of the wing, but may also be installed on the lower surface of the wing as well.
Adverse yaw is the natural and undesirable tendency for an aircraft to yaw in the opposite direction of a roll.It is caused by the difference in lift and drag of each wing. The effect can be greatly minimized with ailerons deliberately designed to create drag when deflected upward and/or mechanisms which automatically apply some amount of coordinated rudde
Spoilers can also be thought of as "lift reducers" because they reduce the lift of the wing in which the spoiler resides. For example, an uncommanded roll to the left could be reversed by raising the right wing spoiler (or only a few of the spoilers present in large airliner wings).