Definition

A body shaped to produce an aerodynamic reaction (lift) perpendicular to its direction of motion, for a small resistance (drag) force in that plane.

Description

The wing's shape causes airflow to speed up as it passes over the top of the wing, causing a reduction in pressure; this generates a force (lift) perpendicular to the chord of the aerofoil. The airflow below the wing moves more slowly, generating greater pressure and less or negative lift. See the article Bernoulli's Principle for further information.