Resistance of a vehicle body to motion through the air. A smooth surface has less drag than a rough one.

It may be broken down into three main components:
  1. skin friction: this is drag due to the surface texture and area.
  2. profile drag: this is drag from the three-dimensional shape of the aircraft/vehicle.
  3. service drag: this is drag from air ducted to cooling components.

The bottom half of a horizontally parted mould.

See also: Aerodynamic Force, Boattail, Drag Coefficient, Lift Coefficient, Rolling Resistance, Streamlined, Vehicle Aerodynamic Drag.

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Subjects: Aerodynamics Fluid Dynamics