Quick Facts
- Type
- Aerodynamic Metric
- Definition
- A dimensionless number (CD) quantifying the total aerodynamic drag on a body,...
- Used By
- Engineers, Pilots
Definition#
Drag coefficient (CD) is a dimensionless coefficient that quantifies the aerodynamic resistance of a body moving through air. It includes both parasite drag (form, skin friction, interference) and induced drag (a byproduct of lift).
Why It Matters Operationally#
Lower CD means less fuel consumption at a given speed. Aircraft designers optimize shapes and surfaces to minimize CD while maintaining adequate CL.
Related Guides#
- Induced vs Parasite Drag
- How Airplanes Fly — The Complete Aviation Fundamentals Guide
- How Jet Engines Work (Turbofan vs Turboprop)