# skin friction/surface friction drag

skin friction/surface friction drag
Drag caused by the unevenness in the skin of a body. The layers of air near the surface are retarded, and the speed of the airflow increases as the distance from the skin increases. To reduce the skin friction, the surface should be smoothened to the maximum extent. Skin friction is a component of parasite drag. It increases considerably if the airplane’s surfaces are dirty and rough. The skin friction or surface friction drag is determined by the total surface area of the aircraft, the coefficient of the viscosity of the air, and the rate of change of the velocity across the airflow.
Airflow along a rough surface.
Airflow along a smooth surface.

Aviation dictionary. 2014.

### Look at other dictionaries:

• skin friction drag — Aeron. aerodynamic resistance or drag due to the contact of moving air with the surface of an airplane, a glider, etc. * * * …   Universalium

• skin friction drag — Aeron. aerodynamic resistance or drag due to the contact of moving air with the surface of an airplane, a glider, etc …   Useful english dictionary

• skin friction drag — noun aerodynamic resistance due to the tangential forces of moving air on the surface of a body …

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• Parasitic drag — (also called parasite drag) is drag caused by moving a solid object through a fluid. Parasitic drag is made up of many components, the most prominent being form drag. Skin friction and interference drag are also major components of parasitic drag …   Wikipedia