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Spoilerons roll an aircraft by reducing the lift of the downward-going wing.Unlike ailerons, spoilers do not increase the lift of the upward-going wing. A raised spoileron also increases the drag on the wing where it is deployed, causing the aircraft to yaw.
Spoiler controls can be used for roll control (outboard or mid-span spoilers) or descent control (inboard spoilers). Some aircraft use spoilers in combination with or in lieu of ailerons for roll control, primarily to reduce adverse yaw when rudder input is limited by higher speeds.
Hiding a spoiler at low speeds can improve aerodynamics as well. At low speeds, a fixed spoiler may increase drag and does little to improve the vehicle's handling due to having little airflow over it. A retractable front spoiler can reduce the scraping of the car on curbs or other road imperfections, while still reducing drag at high speeds.
Boeing 777 flaperon Flaperons on a Denney Kitfox Model 3, built in 1991 Flaperons (Junkers style) on an ICP Savannah Model S, built in 2010 Work of the flaperon of Boeing 777. A flaperon (a portmanteau of flap and aileron) on an aircraft's wing is a type of control surface that combines the functions of both flaps and ailerons.
To achieve this, lead weights may be added to the front of the aileron. In some aircraft the aileron construction may be too heavy to allow this system to work without an excessive increase in the weight of the aileron. In this case, the weight may be added to a lever arm to move the weight well out in front to the aileron body.
Air brakes are usually surfaces that deflect outwards from the fuselage (in most cases symmetrically on opposing sides) into the airstream in order to increase form-drag. As they are in most cases located elsewhere on the aircraft, they do not directly affect the lift generated by the wing. Their purpose is to slow down the aircraft.
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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.