Definition
The airspeed at which an airplane stalls while engine power is set at or near takeoff or climb power. Because thrust contributes a vertical component of lift and changes the airflow over the wings, an airplane stalls at a lower indicated airspeed with power on than with power off at the same weight and configuration.
Plain English
The slowest speed the airplane can fly before the wing stops producing enough lift, when the engine is producing significant power rather than at idle.
Context Anchor
In a chandelle, this term matters near the end of the maneuver, when the airplane is climbing steeply, turning, and slowing toward minimum controllable airspeed.
Derivation
Stall comes from an older meaning of stopping or coming to a standstill. In aviation, it does not mean the engine stops; it means the wing’s smooth lift breaks down because the wing is being asked to fly at too high an angle.
Why Pilots Care
Pilots must know this lower speed to avoid unintentional stalls when using full power in climbing turns and other maneuvers.
Grounding Statement
Picture the airplane climbing with power on, nose high, and getting slower until the wing reaches the point where it can no longer hold the airplane up smoothly.
Intuition Check
Power-on does not mean stall-proof. Stall speed is not one fixed number; it changes with weight, airplane setup, and how hard the airplane is being maneuvered.
Example Sentence 1
During the chandelle, the airplane is rolled out of the turn just above power-on stall speed.
Example Sentence 2
During training the instructor demonstrated recovery from a power-on stall at full throttle.