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  • Drag is the force that resists the movement of an aircraft through the air.
  •  There are two basic types: parasite drag and induced drag. The first is called parasite because it in no way functions to aid flight, while the second, induced drag, is a result of an airfoil developing lift.
Parasite Drag
  • Parasite drag is comprised of all the forces that work to slow an aircraft’s movement.
  •  As the term parasite implies, it is the drag that is not associated with the production of lift.
  • This includes the displacement of the air by the aircraft, turbulence generated in the airstream, or a hindrance of air moving over the surface of the aircraft and airfoil.
  •  There are three types of parasite drag: form drag, interference drag, and skin friction.
Form Drag
  • Form drag is the portion of parasite drag generated by the aircraft due to its shape and airflow ow around it.
  • Examples include the engine cowlings, antennas, and the aerodynamic shape of other components.
  •  When the air has to separate to move around a moving aircraft and its components, it eventually rejoins after passing the body.
  • How quickly and smoothly it rejoins is representative of the resistance that it creates which requires additional force to overcome.

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