Drag coefficient

It has been suggested that this article or section be merged with Automobile drag coefficients#CdA. (Discuss)

Drag coefficient (Cd) is a commonly published rating of a car’s aerodynamic smoothness, related to the shape of the car. Multiplying Cd by the car’s frontal area gives an index of total drag. The result is called drag area, and is listed below for several cars. The width and height of curvy cars lead to gross overestimation of frontal area. These numbers use the manufacturer’s frontal area specifications from the

Mayfield Company Homepage.

Some examples:

Drag area ( Cd x Ft2)

Year Automobile

3.95

1996 GM EV1

5.10

1999 Honda Insight

5.40

1989 Opel Calibra

5.54

1980 Ferrari 308 GTB

5.61

1993 Mazda RX-7

5.61

1993 McLaren F1

5.63

1991 Opel Calibra

5.64

1990 Bugatti EB110

5.71

1990 Honda CRX

5.74

2002 Acura NSX

5.76

1968 Toyota 2000GT

5.88

1990 Nissan 240SX

5.86

2001 Audi A2 1.2 TDI 3L

5.92

1994 Porsche 911 Speedster

5.95

1994 McLaren F1

6.00

1970 Lamborghini Miura S

6.00

1992 Subaru SVX

6.06

2003 Opel Astra Coupe Turbo

6.08

2008 Nissan GTR

6.13

1991 Acura NSX

6.15

1989 Suzuki Swift GT

6.17

1995 Lamborghini Diablo

6.24

2004 Toyota Prius

6.27

1986 Porsche 911 Carrera

6.27

1992 Chevrolet Corvette

6.35

1999 Lotus Elise

6.77

1995 BMW M3

6.79

1993 Corolla DX

6.81

1989 Subaru Legacy

6.96

1988 Porsche 944 S

7.02

1992 BMW 325I

7.10

Saab 900

7.13

2007 SSC Ultimate Aero

7.48

1993 Chevrolet Camaro Z28

7.57

1992 Toyota Camry

8.70

1990 Volvo 740 Turbo

8.71

1991 Buick LeSabre Limited

9.54

1992 Chevy Caprice Wagon

10.7

1992 Chevrolet S-10 Blazer

11.63

1991 Jeep Cherokee

13.10

1990 Range Rover Classic

13.76

1994 Toyota T100 SR5 4×4

14.52

1994 Toyota Land Cruiser

17.43

1992 Land Rover Discovery

18.03

1992 Land Rover Defender 90

18.06

1993 Hummer H1

20.24

1993 Land Rover Defender 110

26.3

2006 Hummer H2 ???

Relationship to velocity

The frictional force of aerodynamic drag increases significantly with vehicle speed. As early as the 1920s engineers began to consider automobile shape in reducing aerodynamic drag at higher speeds. By the 1950s German and British automotive engineers were systematically analyzing the effects of automotive drag for the higher performance vehicles. By the late 1960s scientists also became aware of the significant increase in sound levels emitted by automobiles at high speed. These effects were understood to increase the intensity of sound levels for adjacent land uses at a non-linear rate. Soon highway engineers began to design roadways to consider the speed effects of aerodynamic drag produced sound levels, and automobile manufacturers considered the same factors in vehicle design.

Downforce

Downforce describes the downward pressure created by the aerodynamic characteristics of a car that allows it to travel faster through a corner by holding the car to the track or road surface. Some elements to increase vehicle downforce will also increase drag. It is very important to produce a good downward aerodynamic force because it affects the car speed and traction.

See also

Automobile drag coefficients

Ground effect in cars

Downforce

Wing

Flight dynamics

Slipstream

Fluid dynamics

Aerodynamic stability

References

^ Tuncer Cebeci, Jian P. Shao, Fassi Kafyeke, Eric Laurendeau, Computational Fluid Dynamics for Engineers: From Panel to Navier-Stokes, Springer, 2005, ISBN 3540244514

^ Proceedings: Institution of Mechanical Engineers (Great Britain). Automobile Division: Institution of Mechanical Engineers, Great Britain (1957)

^ C. Michael Hogan & Gary L. Latshaw, The relationship between highway planning and urban noise, Proceedings of the ASCE, Urban Transportation Division specialty conference, May 21/23, 1973, Chicago, Illinois. by American Society of Civil Engineers. Urban Transportation Division

^ “Background Research.” Automobile Aerodynamics. 18 May 2008. DHS. 18 May 2009 <http://web-aerodynamics.webs.com/backgroundresearch.htm>.

External links

Categories: Automotive engineering | AerodynamicsHidden categories: Wikipedia articles needing clarification from March 2008 | All Wikipedia articles needing clarification | Articles to be merged from September 2009 | All articles to be merged

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