Definition
The aerodynamic effects produced when wing flaps are extended, primarily an increase in wing camber and (with some flap types) wing area, resulting in higher lift and higher drag at a given airspeed. These effects allow the airplane to fly safely at slower speeds, descend at steeper angles without gaining excessive airspeed, and use shorter takeoff and landing distances.
Plain English
How flaps change the way the wing flies. When flaps come down, the wing makes more lift and more drag, so the airplane can fly slower and come down more steeply without speeding up.
Context Anchor
Pilots encounter flap aerodynamics during takeoff, approach, landing, go-arounds, and any procedure that calls for a specific flap setting.
Derivation
“Flap” originally referred to something that hangs or moves back and forth. On an airplane, a flap is a movable part on the wing. “Aerodynamics” comes from words meaning “air” and “power” or “force,” which fits because this term is about how moving the flap changes the forces made by the air.
Why Pilots Care
Understanding these effects lets pilots choose flap settings that keep the airplane stable and controllable at low speeds while avoiding stalls or excessive drag.
Grounding Statement
When the flaps are lowered, the wing is reshaped so the airplane can usually fly slower, but it also tends to create more air resistance.
Intuition Check
Do not think of flaps as simple brakes. Flaps change the wing’s shape first; the slowing effect comes mainly from the extra air resistance they create.
Example Sentence 1
On final approach, the pilot lowered full flaps to take advantage of flap aerodynamics for a slower touchdown speed and a steeper descent path.
Example Sentence 2
Knowing flap aerodynamics helped the pilot select the right setting for a short-field landing.