Definition

1. Noun:
   • The acute angle between the direction of the undisturbed relative wind and the chord line of an airfoil (e.g., a wing): This is a fundamental parameter in aerodynamics that describes the orientation of an airfoil relative to the oncoming airflow.

Usage

• The term "angle of attack" is used primarily in aviation, aerospace engineering, and aerodynamics to analyze and control lift.
• It is a critical factor in determining whether an aircraft wing will generate sufficient lift or stall.
• It is typically measured in degrees.

Examples

• Noun:
  • The pilot increased the angle of attack to climb.
  • A high angle of attack can lead to a stall.
  • Engineers carefully calculate the optimal angle of attack for different flight phases.

Advanced Usage

• "Critical angle of attack": The specific angle of attack at which an airfoil stalls, meaning lift decreases dramatically and drag increases.
  • Exceeding the critical angle of attack is dangerous.
• "Indicated angle of attack": The angle of attack value shown on a cockpit instrument, as opposed to the actual geometric angle.
• "Angle of attack" is a key concept in discussions about aircraft performance, safety, and design.

Variants and Related Words

• AoA: A common abbreviation for "angle of attack."
• Attack angle: A less common variant with the same meaning.
• Alpha (α): The symbol often used in equations to represent angle of attack.

Synonyms

• Incidence angle: In specific technical contexts, this can be synonymous, though it more precisely refers to the fixed angle between the wing chord line and the aircraft's longitudinal axis.

Related Phrases

• "On the angle of attack": Referring to being at a specific angle.
  • The aircraft was flying on a high angle of attack.
• "Angle of attack indicator": A flight instrument that displays the current angle of attack to the pilot.

Noun

1. the acute angle between the direction of the undisturbed relative wind and the chord of an airfoil