Air brake (aircraft)

Air brake (aircraft)

In aeronautics, air brakes are a type of flight control used on aircraft to reduce speed during landing.

Air brakes differ from spoilers in that air brakes are designed to increase drag while making little change to lift, whereas spoilers greatly reduce the lift-to-drag ratio and a higher angle of attack required to maintain lift, resulting in a higher stall speed.

Often, characteristics of both spoilers and airbrakes are desirable and are combined - most modern airliner jets feature combined spoiler and airbrake controls. On landing, the deployment of these spoilers causes a dramatic loss of lift and hence the weight of the aircraft is transferred from the wings to the undercarriage, allowing the wheels to be mechanically braked with much less chance of skidding. In addition, the form drag created by the spoilers directly assists the braking effect. Reverse thrust is also used to help slow the aircraft after landing.

The British Blackburn Buccaneer naval strike aircraft designed in the 1950s had a tail cone that was split and could be hydraulically opened to the sides to act as a variable air brake. It also helped to reduce the length of the aircraft in the confined space on an aircraft carrier.

The Sukhoi Su-30 has an airbrake just behind the cockpit, as does the F-15 Eagle and the other members of the Flanker family.

plit control surfaces

The deceleron is an aileron that functions normally in flight but can split in half such that the top half goes up as the bottom half goes down to brake. This technique was first used on the F-89 Scorpion and has since been used by Northrop on several aircraft, including the B-2 Spirit.

The space shuttle uses a similar system. The split rudder opens on landing to act as a speedbrake [] , as shown in the accompanying photo.The Bugatti Veyron car uses an airbrake in the form of a deployable spoiler [] .

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Look at other dictionaries:

  • Air brake — may refer to the following contexts:* Air brake (aircraft), in aeronautics, a type of flight control system used on aircraft to reduce speed* Railway air brake, a type of brake operated by compressed air and used on locomotives and railroad cars… …   Wikipedia

  • air brake — air′ brake n. 1) mac a brake or system of brakes operated by compressed air 2) aer. a device for reducing the air speed of an aircraft by increasing its drag • Etymology: 1870–75, amer …   From formal English to slang

  • air-brake — airˈ brake noun 1. A brake worked by compressed air 2. A means of reducing the speed of an aircraft • • • Main Entry: ↑air …   Useful english dictionary

  • air brake — 1. a brake or system of brakes operated by compressed air. 2. Aeron. a device for reducing the air speed of an aircraft by increasing its drag. 3. a device for stopping the sails of a windmill by disrupting the flow of air around them. [1870 75,… …   Universalium

  • air brake — noun 1. : a brake operated by a piston driven by compressed air from reservoirs connected to brake cylinders by triple valves which upon reduction of air pressure in the brake pipe automatically admit air from the reservoirs into the brake… …   Useful english dictionary

  • air brake — /ˈɛə breɪk/ (say air brayk) noun 1. Aeronautics a hinged flap or other extendible device for reducing the speed of an aircraft. 2. a brake or system of brakes operated by compressed air …   Australian-English dictionary

  • air brake — noun 1》 a brake worked by air pressure. 2》 a movable flap or other device on an aircraft to reduce its speed …   English new terms dictionary

  • air( )brake — A plate, or a series of plates, which when extended, increases the aircraft drag rapidly, thus enabling rapid reduction in speed or regulation in the descent. Airbrakes form an integral part of the airframe and are more effective at high speeds.… …   Aviation dictionary

  • New York Air Brake — NYAB redirects here. For other uses, see NYAB (disambiguation). New York Air Brake Type Privately Held Company Founded 1890 Headquarters Watertown, New York USA …   Wikipedia

  • Brake — A brake is a device for slowing or stopping the motion of a machine or vehicle, or alternatively a device to restrain it from starting to move again. The kinetic energy lost by the moving part is usually translated to heat by friction.… …   Wikipedia

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