The propellers of a C-130J Super Hercules military transport aircraft
A swept wing KC-10 Extender (top) refuels a trapezoidal-wing F-22 Raptor.
A decorated Japanese taketombo bamboo-copter
A white stork flying by flapping its wings.
Leonardo's aerial screw
Condensation in the low pressure region over the wing of an Airbus A340, passing through humid air
Prototype created by Mikhail Lomonosov, 1754
Flaps (green) are used in various configurations to increase the wing area and to increase the lift. In conjunction with spoilers (red), flaps maximize drag and minimize lift during the landing roll.
A 6-bladed Hamilton Standard 568F propeller on an ATR 72 short-haul airliner
The wing of a landing BMI Airbus A319-100. The slats at its leading edge and the flaps at its trailing edge are extended.
A sailor checks the propeller of a Landing Craft Air Cushion hovercraft
Winged tree seeds that cause autorotation in descent
Cut-away view of a Hamilton Standard propeller. This type of constant-speed propeller was used on many American fighters, bombers and transport aircraft of World War II
A laughing gull, exhibiting the "gull wing" outline
Feathered propeller on the outboard TP400 turboprop of an Airbus A400M
Bat in flight
Counter-rotating propellers

An airfoil (American English) or aerofoil (British English) is the shape of a wing, blade (of a propeller, rotor, or turbine), or sail (as seen in cross-section).

- Wing

While some earlier engineers had attempted to model air propellers on marine propellers, the Wright Brothers realized that a propeller is essentially the same as a wing, and were able to use data from their earlier wind tunnel experiments on wings, introducing a twist along the length of the blades.

- Propeller (aeronautics)
The propellers of a C-130J Super Hercules military transport aircraft

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Examples of airfoils in nature and in or on various vehicles. The dolphin flipper at bottom left obeys the same principles in a different fluid medium; it is an example of a hydrofoil.

Airfoil

Examples of airfoils in nature and in or on various vehicles. The dolphin flipper at bottom left obeys the same principles in a different fluid medium; it is an example of a hydrofoil.
Streamlines around a NACA 0012 airfoil at moderate angle of attack
Lift and drag curves for a typical airfoil
Airfoil nomenclature
Different definitions of airfoil thickness
An airfoil designed for winglets (PSU 90-125WL)
An airfoil section is displayed at the tip of this Denney Kitfox aircraft, built in 1991.
Airfoil of a Kamov Ka-26 helicopter's lower rotor blade

An airfoil (American English) or aerofoil (British English) is the cross-sectional shape of an object whose motion through a gas is capable of generating significant lift, such as a wing, a sail, or the blades of propeller, rotor, or turbine.