Definition
A condition of airflow in which air moves over a surface in smooth, parallel layers (or sheets) with little or no mixing between them. Each layer slides past the next without turbulence, producing minimum drag and predictable lift behavior over a wing or body.
Plain English
Air flowing over the wing in smooth, even sheets that glide past each other without churning or mixing.
Context Anchor
Seen in discussions of wing shape, drag, surface smoothness, and how dirt, ice, or damage can affect airflow over an aircraft.
Derivation
From the Latin lamina, meaning a thin sheet or layer. The word pictures the air moving as a stack of thin sheets, each one sliding cleanly over the next.
Why Pilots Care
Laminar flow produces lower skin-friction drag than turbulent flow, improving fuel efficiency, range, and climb performance.
Analogy
It is like a neat stack of papers sliding smoothly across a table. If the papers catch and scatter, the motion becomes messy instead of smooth.
Grounding Statement
Picture syrup pouring smoothly off a spoon in even sheets — that is laminar. The moment it starts to swirl and break up, it is no longer laminar.
Intuition Check
Laminar flow does not mean the air is still or weak. It means the moving air stays smooth and organized instead of becoming rough and swirling.
Example Sentence 1
The airfoil was designed to maintain laminar flow over the forward portion of the wing to reduce drag.
Example Sentence 2
At higher speeds the laminar flow over the upper surface began to transition to turbulent flow near the trailing edge.