Ice accumulation multiplies parasite drag through three compounding mechanisms that degrade the takeoff performance envelope.
Ice texture massively increases surface friction across the upper wing, raising the skin-friction component of total drag along the entire airfoil.
The altered wing profile creates a low-pressure wake that physically drags the aircraft backward, compounding the form-drag penalty.
High drag restricts the aircraft's ability to accelerate to rotation speed (VR) before the runway end, eroding the takeoff safety margin.