Definition
The center of pressure is the single point on a wing (or other airfoil) where the total aerodynamic force from the airflow can be considered to act. Lift and drag are produced unevenly across the whole wing surface, but their combined effect can be summed up as one force acting at this one point. The location of the center of pressure shifts along the chord of the wing as the angle of attack changes — generally moving forward as angle of attack increases, and rearward as it decreases.
Plain English
Air pushes on every part of a wing, but if you added all those pushes together you could replace them with one push at one spot. That spot is the center of pressure. It doesn't stay still — it slides forward and backward along the wing as the wing's angle to the airflow changes.
Context Anchor
Seen in aerodynamics and lift discussions when explaining how airflow produces lift on a wing.
Derivation
Straightforward: 'center' (the middle or balance point) and 'pressure' (the force the air exerts on the wing). It's the balance point of all the air pressure acting on the airfoil.
Why Pilots Care
Its position relative to the center of gravity creates pitching moments that affect stability and control.
Analogy
Think of holding up a board with one finger. Even if the board’s weight is spread out, there is one spot where you can support it as if the weight were concentrated there. The center of pressure is a similar idea for the air’s force on a wing.
Intuition Check
Do not assume the center of pressure is simply the physical center of the wing. It is the point where the combined air pressure forces can be represented as acting.
Example Sentence 1
As the pilot increased the angle of attack during slow flight, the center of pressure moved forward along the wing.
Example Sentence 2
The pilot trims the elevator to balance the moment created by the center of pressure during cruise.