Definition

1. Noun:
   • A device that provides reactive force when in motion relative to the surrounding air; can lift or control a plane in flight: An airfoil is a specially shaped structure, such as a wing, propeller blade, or rudder, designed to generate a force (like lift or control) when air flows over it.

Usage

• The term "airfoil" is a technical term primarily used in the fields of aerodynamics, aviation, and engineering. It describes the cross-sectional shape of a wing, blade, or fin that interacts with a fluid (air) to produce an aerodynamic force.

Examples

• Noun:
  • The engineers tested a new airfoil design in the wind tunnel.
  • The lift generated by an airplane's wing depends on the shape of its airfoil.
  • The propeller's efficiency is determined by its airfoil section.

Advanced Usage

• "Airfoil section" or "airfoil profile": Refers to the specific two-dimensional cross-sectional shape of the airfoil.
  • The NACA 0012 is a symmetrical airfoil profile often used for helicopter rotor blades.
• "Airfoil theory": The branch of aerodynamics concerned with the properties and performance of airfoils.
  • Understanding basic airfoil theory is essential for aircraft designers.

Variants and Related Words

• Aerofoil (noun): The British English spelling of "airfoil". It has the same meaning.
  • The aerofoil shape is critical for generating lift.
• Wing (noun): A common structure that uses an airfoil shape. While a wing is an airfoil, not all airfoils are wings (e.g., turbine blades, sails).
• Airfoil-shaped (adjective): Having the characteristic shape of an airfoil.
  • The bridge's towers have an airfoil-shaped cross-section to reduce wind resistance.

Synonyms

• Aerofoil: The direct British English synonym.
• Wing section: Specifically refers to the airfoil shape of a wing.
• Profile: In technical contexts, can refer to the shape of the airfoil.

Related Phrases and Concepts

• Lift: The upward force generated by an airfoil moving through air.
• Drag: The resistance force acting opposite to the airfoil's motion.
• Angle of attack: The angle between the airfoil's chord line and the oncoming air flow, crucial for its performance.
• Camber: The curvature of the airfoil's upper and lower surfaces, affecting lift.

Noun

1. a device that provides reactive force when in motion relative to the surrounding air; can lift or control a plane in flight