The 0.4mm Sandpaper Effect

Visual Diagram
Leading Edge Stagnation:

Contamination no thicker or rougher than medium-coarse sandpaper initiates catastrophic stall flow separation across the upper wing surface.

Kinetic Energy Loss:

Instantly reduces the kinetic energy in the airflow, preventing it from adhering to the wing's curve.

Hidden Danger:

Triggers premature stall completely bypassing early warning systems.