# drag coefficient

- (Cd) A number used in calculating the aerodynamic drag acting on a vehicle. The drag coefficient is a function of factors like the shape of the vehicle, airflow through the vehicle for ventilation and cooling. The number is determined in a wind-tunnel or by coasting tests performed on the vehicle. The lower the drag coefficient the less drag on the vehicle and the more aerodynamic is the vehicle. A sleek vehicle has a drag coefficient, or "Cd," of about 0.30; a square, flat plate's is 1.98. Also signified by Cx.

*Dictionary of automotive terms.
2015.*

### Look at other dictionaries:

**Drag coefficient**— In fluid dynamics, the drag coefficient (commonly denoted as: cd, cx or cw) is a dimensionless quantity that is used to quantify the drag or resistance of an object in a fluid environment such as air or water. It is used in the drag equation,… … Wikipedia**drag coefficient**— i. Nondimensional coefficient equal to total drag divided by 1/2ρV2 S, where ρ is density, V is indicated air speed, and S is surface area of the body. ii. A coefficient representing the drag on a given airfoil or other body or a coefficient… … Aviation dictionary**drag coefficient**— vilkimo koeficientas statusas T sritis fizika atitikmenys: angl. drag coefficient; dragging coefficient vok. Mitbewegungskoeffizient, m; Mitführungskoeffizient, m rus. коэффициент увлечения, m pranc. coefficient d’entraînement, m … Fizikos terminų žodynas**drag coefficient**— noun the ratio of the drag on a body moving through air to the product of the velocity and the surface area of the body • Syn: ↑coefficient of drag • Hypernyms: ↑coefficient * * * noun : a factor representing the ratio of the aerodynamic drag… … Useful english dictionary**drag coefficient**— Aerodynamics. the ratio of the drag on a body moving through air to the product of the velocity and surface area of the body. Also called coefficient of drag. * * * … Universalium**drag coefficient**— noun Date: 1937 a factor representing the drag acting on a body (as an automobile or airfoil) … New Collegiate Dictionary**drag coefficient**— /dræg koʊəˈfɪʃənt/ (say drag kohuh fishuhnt) noun Fluid Dynamics the number which represents the resistance of an object to flow in a fluid environment such as air or water … Australian English dictionary**drag coefficient**— number that represents the intensity of force acting on a body in motion in direct opposition to the body s motion … English contemporary dictionary**coefficient of drag (CD)/drag coefficient**— A coefficient dependent upon the angle of attack, shape of the airfoil, Reynolds number, and Mach number. Drag coefficient (CD ) = Drag (D)/Dynamic Pressure (q) or {1 /2 (Density (ρ) × Air Speed2 (V2 ) × Wing Area (S). CD = D/qS, or 2D/ρV2 S … Aviation dictionary**Zero-lift drag coefficient**— In aerodynamics, the zero lift drag coefficient CD,0 is a dimensionless parameter which relates an aircraft s zero lift drag force to its size, speed, and flying altitude. Mathematically, zero lift drag coefficient is defined as CD,0 = CD − CD,i … Wikipedia