Cd (Coefficient of Drag)

x07cc_ch240.jpg(Gambar diatas adalah salah satu mobil yang sedang melakukan pengetesan Coefficient of Drag)

Cd atau Coefficient of Drag merupakan satuan dari nilai hambatan udara dari suatu benda yang bergerak. Kebanyakan satuan Cd dibuat untuk mengukur nilai hambatan udara kendaraan yang bergerak cepat seperti pesawat, mobil, dan motor. Para desainer kendaraan khususnya kendaraan sport harus memutar otaknya agar memperoleh nilai hambatan yang sekecil mungkin, hal ini dilakukan agar mesin kendaraan tidak perlu mengeluarkan tenaga lebih untuk membelah angin, maka hal itu akan membuat konsumsi BBM menjadi lebih irit. Untuk mobil F1 Cd yang bisa diperoleh sekitar 0,7 sampai 1,1 Cd. Semakin besar kendaraan, maka semakin besar pula nilai hambatan udara. Berikut adalah rumus untuk menghitung Coefficient of Drag sebuah kendaraan

Computer drawing of a rocket. Drag coefficient equals drag  divided by the density times the area times half the velocity squared.

(http://exploration.grc.nasa.gov/education/rocket/dragco.html) <!–
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(http://en.wikipedia.org/wiki/Automobile_drag_coefficients)
Production cars

Cd

↓

Automobile  ↓ Year  ↓
0.7 to 1.1 typical values for a Formula 1 car (downforce settings change for each circuit)
0.7 Caterham Seven
0.6 + a typical truck
0.57 Hummer H2 2003
0.51 Citroën 2CV 1948
0.48 Volkswagen Beetle [6]
0.47 Lancia Aprilia 1937
0.46 Ford Mustang (coupe) 1979
0.45 Dodge Viper RT/10 1996
0.44 Ford Mustang (fastback) 1979
0.44 Peugeot 305 1978
0.44 Peugeot 504 1968
0.44 Toyota Truck 1990
0.425 Duple 425 coach
(named for its low Cd by coach standards)
c.1985
0.42 Lamborghini Countach 1974
0.42 Triumph Spitfire Mk IV 1971
0.42 Plymouth Duster 1994
0.41 Volvo 740 (sedan) 1982
0.40 Ford Escape Hybrid 2005
0.40 Nissan Skyline GT-R R32 1989
0.39 Dodge Durango 2004
0.39 Triumph Spitfire 1964
0.38[4]
0.39[5]
VW NewBeetle without wing or spoiler 2003
0.385 Nissan 280ZX 1978
0.38 Mazda Miata 1989
0.374 Ford Capri Mk III 1978
0.372 Ferrari F50 1996
0.37 Renault Twingo
0.37 BMW Z3 M coupe 1999
0.37 Volkswagen Tiguan 2008
0.36 Citroën CX (named after the term for Cd) 1974
0.36 Citroën DS 1955
0.36 Chrysler Sebring 1996
0.36 Ferrari Testarossa 1986
0.36 Ford Mustang 1999
0.36 Honda Civic 2001
0.36 Opel GT 1969
0.355 NSU Ro 80 1967
0.35 Aston Martin Vanquish 2004
0.35 Dodge Viper GTS 1996
0.35 Jaguar XKR 2005
0.35 Toyota MR2 1998
0.35 BMW Z4 M coupe 2006
0.35 Volvo 940 (sedan) 1990
0.35 MINI Cooper 2008
0.34 Aston Martin DB9 2004
0.34 Chevrolet Caprice 1994
0.34 Ferrari F40 1987
0.34 Ferrari 360 Modena 1987
0.34 Ferrari F430 F1 1999
0.34 Ford Sierra 1982
0.34 Ford Puma 1997
0.34 Honda Prelude 1988
0.34 Mercedes-Benz SL (Roof Down) 2001
0.34 Peugeot 106 1991
0.338 Chevrolet Camaro, 1995
0.33 Audi A3 2006
0.33 Citroën SM 1970
0.33 Dodge Charger 2006
0.33 Ford Crown Victoria 1992
0.33 Honda Accord Sedan 2002
0.33 Lamborghini Murcielago 2001
0.33 Mazda RX-7 FC3C 1987
0.33 Peugeot 206 1998
0.33 Peugeot 309 1986
0.33 Renault Modus 2004
0.33 Subaru Impreza WRX STi 2004
0.324 Cobalt SS Supercharged 2005
0.32 AMC Pacer 1975-1980
0.32 Buick Riviera 1995
0.32 Dodge Avenger 1995
0.32 Honda Accord Coupe 2002
0.32 Mazdaspeed3 2007
0.32 McLaren F1 1992
0.32 Mercedes-Benz 190E 2.5-16/2.3-16
0.32 Nissan 300ZX 1989
0.32 Peugeot 406 1995
0.32 Peugeot 806 1994
0.32 Scion xB 2008
0.32 Suzuki Swift 1991
0.32 Toyota Celica 1994
0.32 Volkswagen GTI Mk V 2006
0.31 Audi A4 B5 1995
0.31 Citroën AX 1986
0.31 Citroën GS 1970
0.31 Eagle Vision 1995
0.31 Ford Falcon 1995
0.31 Holden Commodore 1998
0.31 Honda Civic (Sedan) 2006
0.310 Lamborghini Diablo 1990
0.31 Mazda RX-7 FC3S 1986
0.31 Mazda RX-7 FD R1(R2) 1993
0.31 Mazda RX-8 2004
0.31 Nissan Tiida / Versa 2004
0.31 Peugeot 307 2001
0.31 Renault 25 1984
0.31 Saab Sonett III 1970
0.31 Toyota Avalon 1995
0.31 Toyota RAV4 2006
0.31 Volkswagen GTI Mk IV 1997
0.30 Acura NSX 2005
0.30 Audi 100 1983
0.30 BMW E90 2006
0.30 Hyundai Sonata 2006
0.30 Honda Accord Sedan 2003, 2005-2007
0.30 Honda Odyssey 2005
0.30 Koenigsegg CCX 2006
0.30 Mitsubishi Eclipse 2000
0.30 Nissan 180SX 1989
0.30 Nissan 300ZX 1983
0.30 Nissan 350Z 2002
0.30 Porsche 996 1997
0.30 Porsche 997 GT3 RS 2007
0.30 Saab 92 1947
0.295 Ford Falcon 1998
0.291 Toyota Avalon 2005
0.29 Alfa Romeo 155 1992
0.29 BMW 8-Series 1989
0.29 Chevrolet Corvette 2005
0.29 Chevrolet Corvette C5 Z06 2002
0.29 Daewoo Espero 1990
0.29 Dodge Charger Daytona 1969
0.29 Eagle Talon 1990s [2]
0.29 Honda Accord Hybrid 2005, 2007
0.29 Honda Accord Coupe 2003, 2005-2007
0.29 Honda CRX HF 1988
0.29 Infiniti G35 Sedan 2008
0.29 Lancia Dedra 1990
0.29 Lexus LS 400 1990
0.29 Lotus Elite 1958
0.29 Lotus Europa 1966
0.29 Mazda Millenia 1995
0.29 Mazda RX-7 FC3S Aero Package 1986
0.29 Mazda RX-7 FD 1993
0.29 Mercedes-Benz SL (Roof Up) 2001
0.29 Mercedes-Benz W203 C-Class Coupe 2001
0.29 Nissan Versa 2007-2008
0.29 Peugeot 308 2007
0.29 Peugeot 407 2004
0.29 Peugeot 607 1999
0.29 Porsche Boxster 2005
0.29 Porsche 997 GT3 2006
0.29 Subaru XT 1985
0.29 Subaru SVX 1992
0.29 Toyota Prius 2001
0.28 Chevrolet Corvette Z06 2006
0.28 Citroën XM 1989
0.28 Citroën C4 2004
0.28 Lexus IS 2006
0.28 Mitsubishi Diamante 1995
0.28 Porsche 997 2004
0.28 Renault 25 TS 1984
0.28 Rumpler-Tropfenwagen 1921
0.28 Saab 9-3 2003
0.28 Toyota Camry / Lexus ES 2005
0.28 Volkswagen NewBeetle with wing 2003
0.27 Honda Civic Hybrid 2006
0.27 Infiniti G35
(0.26 with “aero package”)
2002
0.27 Hyundai Genesis 2009
0.27 Mazda6 (sedan and hatchback) 2008 [6]
0.27 Mercedes-Benz W203 C-Class Sedan 2001
0.27 Nissan GT-R 2008
0.27 Toyota Camry Hybrid 2007
0.27 Tucker Torpedo 1948
0.27 Volkswagen Passat B5 (sedan) 1997
0.27 Mercedes-Benz S Class
(0.268 with Sport Package)
2000-2005
0.26 Hotchkiss Gregoire[citation needed] 1951
0.26 Lexus LS 430
(0.25 with air suspension)
2001
0.26 Mercedes-Benz W221 S-Class 2006
0.26 Opel Calibra 1989
0.26 Toyota Prius 2004
0.25 Audi A2 1.2 TDI 2001
0.25 Honda Insight 1999, 2003, 2005
0.212 Tatra T77 1935
0.195 General Motors EV1 1996
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