Wing: Wikis

  
  
  

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A Laughing Gull with its wings extended in a gull wing profile
Aircraft wing planform shapes: a swept wing KC-10 Extender (top) refuels a trapezoid-wing F-22 Raptor

A wing is a surface used to produce lift for flight through the air or another gaseous or fluid medium. The wing shape is usually an airfoil. The word originally referred only to the foremost limbs of birds, but has been extended to include the wings of insects (see insect wing), bats, pterosaurs, and aircraft.

A wing's aerodynamic quality is expressed as a Lift-to-drag ratio. The lift generated by a wing at a given speed and angle of attack can be 1-2 orders of magnitude greater than the drag. This means that a significantly smaller thrust force can be applied to propel the wing through the air in order to obtain a specified lift.

Contents

Design features

Aircraft wings may feature some of the following:

  • A rounded leading edge cross-section
  • A sharp trailing edge cross-section
  • Leading-edge devices such as slats, slots, or extensions
  • Trailing-edge devices such as flaps or flaperons (combination of flaps and ailerons)
  • Ailerons (usually near the wingtips) to provide roll control
  • Spoilers on the upper surface to disrupt lift and provide additional roll control
  • Vortex generators to help prevent flow separation in transonic flow
  • Wing fences to keep flow attached to the wing by stopping boundary layer separation from spreading
  • Winglets to keep wingtip vortices from increasing drag and decreasing lift
  • Dihedral, or a positive wing angle to the horizontal. This gives inherent stability in roll. Anhedral, or a negative wing angle to the horizontal, has a destabilising effect
  • Folding wings allow more aircraft to be carried in the confined space of the hangar of an aircraft carrier.
  • Variable-sweep wing or 'swing wing' to allow outstretched wings for slow speed (i.e. take-off and landing) and swept back wings for high speed (usually supersonic) flight, such as the FB-111 and the F-14.

Science of wings

The wing of a landing BMI Airbus A319-100. The slats at the leading edge and the flaps at the trailing edge are extended.

The science of wings is one of the principal applications of the science of aerodynamics. In order for a wing to produce lift it has to be at a positive angle to the airflow. In that case a low pressure region is generated on the upper surface of the wing which draws the air above the wing downwards towards what would otherwise be a void after the wing had passed. On the underside of the wing a high pressure region forms accelerating the air there downwards out of the path of the oncoming wing. The pressure difference between these two regions produces an upwards force on the wing, called lift.

The pressure differences, the acceleration of the air and the lift on the wing are intrinsically one mechanism. It is therefore possible to derive the value of one by calculating another. For example lift can be calculated by reference to the pressure differences or by calculating the energy used to accelerate the air. Both approaches will result in the same answer if done correctly. Debates over which mathematical approach is the more convenient can be wrongly perceived as differences of opinion about the principles of flight and often create unnecessary confusion in the mind of the layman.

For a more detailed coverage see lift (force).

Internal mechanical construction of a generic mono spar wing. Black=solid, red=tube used for the spar, green=foam or wood or honeycomb or sheet metal used for the ribs. The leading edge gives torsional stiffness. The trailing can either have a flexible skin, which does not break under wing bending (bird-like) or have a stiff skin (made of carbon fiber or aluminum, jet-like) which is prevented from bucking by span-wise stringers.
Flaps are used to increase lift at low speed.

A common misconception is that it is the shape of the wing that is essential to generate lift by having a longer path on the top rather than the underside. This is not the case, thin flat wings can produce lift efficiently and aircraft with cambered wings can fly inverted as long as the nose of the aircraft is pointed high enough so as to present the wing at a positive angle of attack to the airflow.

The common aerofoil shape of wings is due to a large number of factors many of them not at all related to aerodynamic issues, for example wings need strength and thus need to be thick enough to contain structural members. They also need room to contain items such as fuel, control mechanisms and retracted undercarriage. The primary aerodynamic input to the wing’s cross sectional shape is the need to keep the air flowing smoothly over the entire surface for the most efficient operation. In particular, there is a requirement to prevent the low-pressure gradient that accelerates the air down the back of the wing becoming too great and effectively “sucking” the air off the surface of the wing. If this happens the wing surface from that point backwards becomes substantially ineffective.

The shape chosen by the designer is a compromise dependent upon the intended operational ranges of airspeed, angles of attack and wing loadings. Usually aircraft wings have devices, such as flaps, which allow the pilot to modify shape and surface area of the wing to be able to change its operating characteristics in flight.

In 1948 Francis Rogallo invented the fully limp flexible wing which ushered new possibilities for aircraft. Near in time Domina Jalbert invented flexible un-sparred ram-air airfoiled thick wings. These two new branches of wings have been since extensively studied and applied in new branches of aircraft, especially altering the personal recreational aviation landscape.

A Mute Swan spreads its wings.

The science of wings applies in other areas beyond conventional fixed-wing aircraft, including:

  • Hang gliders which use wings from fully-flexible (paragliders, gliding parachutes) wings, flexible wings (framed sail wings), to rigid wings.
  • Kites which use a vast variety of wings.
  • Aeromodelling
  • Helicopters which use a rotating wing with a variable pitch or angle to provide a directional force
  • The space shuttle which uses its wings only for lift during its descent
  • Some racing cars, especially Formula One cars, which use upside-down wings to give cars greater adhesion at high speeds over 100 mph.
  • Sailing boats which use sails as vertical wings with variable fullness and direction to move across water.

Structures with the same purpose as wings, but designed to operate in liquid media, are generally called fins or hydroplanes, with hydrodynamics as the governing science. Applications arise in craft such as hydrofoils and submarines. Sailing boats use both fins and wings.

See also

External links


Wiktionary

Up to date as of January 15, 2010
(Redirected to wing article)

Definition from Wiktionary, a free dictionary

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Contents

English

Alternative spellings

Pronunciation

Etymology

From Old Norse vængr.

Noun

Singular
wing

Plural
wings

wing (plural wings)

  1. An appendage of an animal's (bird, bat, insect) body that enables it to fly.
  2. (slang) Human arm.
  3. Part of an airplane that produces the lift for rising into the air.
  4. Part of a building, an extension from the main building
  5. Part of a huge room. (Can we verify(+) this sense?)
  6. A fraction of a political movement. Usually implies a position apart from the mainstream center position.
  7. An organizational grouping in a military aviation service:
    1. (British) A unit of command consisting of two or more squadrons and itself being a sub-unit of a group or station.
    2. (US) A larger formation of two or more groups, which in turn control two or more squadrons.
  8. (British) A panel of a car which encloses the wheel area, especially the front wheels.
  9. (nautical) A platform on either side of the bridge of a vessel, normally found in pairs.
  10. (field hockey, ice hockey, soccer) A position in several field games on either side of the field.

Synonyms

  • fender (US, panel of a car)
  • guard (Aus, panel of a car)

Related terms

Translations

The translations below need to be checked and inserted above into the appropriate translation tables, removing any numbers. Numbers do not necessarily match those in definitions. See instructions at Help:How to check translations.

Verb

Infinitive
to wing

Third person singular
wings

Simple past
winged

Past participle
winged

Present participle
winging

to wing (third-person singular simple present wings, present participle winging, simple past and past participle winged)

  1. (transitive) To injure slightly (as with a gunshot), especially in the arm.
  2. (intransitive) To fly.
  3. (intransitive) wing it: To act or speak extemporaneously; to improvise.

Translations


Simple English

A wing is the part of an animal or airplanes that allows it to fly.

Animal wings

A wing is part of an animal that allows it to fly. By moving its wings, the animal can produce lift and get off the ground.

Animals that have wings are insects, birds and bats. Birds' wings are made of feathers. The wings of bats are made of skin, which is stretched between the bones of the bat's arms and fingers. Not all insects and birds can fly, even if they have wings.

Artificial wings

  • Airplanes also have wings. Those wings cannot be moved, they are stable, but the wings also produce lift, so the airplane will get off the ground if you move it fast enough.
  • People also talk about wings of buildings. What they mean is usually a part of the building that is separated from the rest (for example: the west wing of a building).








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