Definition
Angles of attack in which the wing's chord line meets the oncoming air with the leading edge raised above the relative wind, producing lift in the normal upward sense. A positive angle of attack exists whenever the wing is tilted nose-up relative to the airflow striking it.
Plain English
The wing is tipped slightly nose-up into the oncoming air. This is the normal flying condition and is what causes the wing to lift the airplane.
Context Anchor
Seen in aerodynamics, aircraft control, lift, and stall discussions, including when a pilot is thinking through aircraft performance or unusual aircraft attitudes.
Derivation
‘Angle of attack’ describes the angle at which the wing ‘attacks’ (meets) the air. ‘Positive’ here means above the reference line (the chord line), not ‘good’ or ‘strong.’ It is a directional label, not a quality judgment.
Why Pilots Care
Recognizing when the wing is producing lift helps pilots avoid stalls and maintain safe flight.
Analogy
Hold your hand flat out a car window, then tilt the front of your hand slightly upward. That upward tilt into the moving air is similar to a positive angle of attack.
Intuition Check
Positive does not mean “good” or “safe” here; it means greater than zero. Attack does not mean combat; it means the angle at which the wing meets the airflow.
Example Sentence 1
During the climb after takeoff, the wing is operating at a relatively high positive angle of attack to generate the lift needed to gain altitude.
Example Sentence 2
At cruise speed the wing operates at small positive angles of attack for efficient lift.