1. Drag coefficient in Automobiles

2. Drag Force and Drag Coefficients

3. Drag Coefficient It is a dimensionless quantity
Used to quantify the drag or resistance of an object in a fluid environment such as air or water.
Used in the drag equation, where a lower drag coefficient indicates the object will have less aerodynamic or hydrodynamic drag.
The drag coefficient is always associated with a particular surface area.

4. REYNOLDS NUMBER VS Coefficient of drag

5. Drag coefficient for various items

6. Drag coefficient of various aircraft

7. Measured Drag Coefficients

8. Blunt body and streamlined body

9. Automobile drag coefficient
The drag coefficient is a common measure in automotive designed as it pertains to aerodynamic.
The drag coefficient of an automobile impacts the way the automobile passes through the surrounding air.
When automobile companies design a new vehicle they take into consideration the automobile drag coefficient in addition to the other performance characteristics.
Aerodynamic drag increases with the square of speed; therefore a low value is preferable to a high one.
Reducing the drag coefficient in an automobile affects the performance of the vehicle as it pertains to speed and fuel efficiency.

10. Drag coefficient of various automobiles

11. Reducing Drag
The two main factors that impact drag are the frontal area of the vehicle and the drag coefficient.
 Lowering the drag coefficient comes from streamlining the exterior body of the vehicle.
The most aerodynamic shape is a body Sears- Hack body which is a shape that essentially consists of an elongated tube with pointed ends.
Modifications 1)  Deletion of certain parts
2) Fabrication

12. Deletion Roof rack Mud flaps Rear spoiler Side mirrors Radio antenna
Windshield wipers

13. Deletion parts

14. Deletion parts

15. Wheel covers Partial grille block Under tray Fender skirts
Fabrication
Wheel covers
Partial grille block
Under tray
Fender skirts
Modified front bumper
Kammback

16. Fabrication parts

17. Fabrication parts

18. Boundary layer transmission