Definition
A pitch attitude in which the nose of the airplane is held higher than the tail so that the wing meets the oncoming air at a positive angle of attack (AOA). During the takeoff roll, holding this tail-low attitude means the wing is set at an angle that produces lift as airspeed increases, allowing the airplane to fly itself off the runway when sufficient speed is reached.
Plain English
The airplane is rolling down the runway with its nose tilted slightly up and its tail low. Because the wing is tilted up to meet the air, it starts producing lift as the airplane speeds up, and the airplane lifts off on its own when it's ready.
Context Anchor
Seen during takeoff discussions, especially when describing how airplane attitude affects lift during the takeoff roll and liftoff.
Derivation
Angle of attack (AOA) is the angle between the wing and the oncoming air. "Positive" here means the wing's leading edge is higher than its trailing edge relative to the airflow, so the wing is tilted into the wind in a way that produces lift. "Tail-low" simply describes the airplane's posture on the runway that creates this angle.
Why Pilots Care
Achieving positive AOA in the tail-low attitude generates the lift required for liftoff while preserving directional control in a crosswind.
Analogy
Think of holding your hand out of a car window and tilting the front edge slightly upward. As air hits it, your hand wants to rise. A wing with positive AOA is doing the same basic thing.
Intuition Check
Positive does not mean “good” here; it means the angle is above zero. Attitude does not mean emotion; it means the airplane’s nose-and-tail position.
Example Sentence 1
As the airplane accelerated down the runway, the pilot held back pressure on the yoke to maintain a positive AOA in a tail-low attitude until the airplane lifted off.
Example Sentence 2
Holding a positive AOA after liftoff allowed the airplane to accelerate and climb while staying aligned with the runway.