Definition
Movable or fixed surfaces on an airplane that change how air flows over the structure in order to control flight, modify lift, increase drag, or improve handling. Common examples include flaps, slats, spoilers, ailerons, elevators, rudders, and trim tabs.
Plain English
Parts of the airplane — usually movable panels on the wings or tail — that the pilot or design uses to shape the airflow and change how the airplane flies.
Context Anchor
You meet this term when studying the wing and tail surfaces that move or are shaped to control how the airplane responds in flight.
Derivation
‘Aerodynamic’ comes from the Greek aer (air) and dynamis (power or force), meaning ‘relating to the forces of air in motion.’ A device is simply a piece of equipment built for a purpose. Together: equipment that works by acting on the moving air around the airplane.
Why Pilots Care
These devices directly affect how the airplane handles during takeoff, approach, landing, and emergency descents.
Grounding Statement
When air flows over a shaped or moved surface, the force on the airplane changes.
Intuition Check
Do not picture “device” as only an electronic gadget or powered machine. Here it can mean a simple shaped or movable airplane part that affects the air flowing around it.
Example Sentence 1
The flaps and ailerons are aerodynamic devices located on the trailing edge of the wing.
Example Sentence 2
Extending the aerodynamic devices on the wings also increased drag so the airplane could descend without gaining excessive speed.