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The term drag area derives from aerodynamics, where it is the product of some reference area (such as cross-sectional area, total surface area, or similar) and the drag coefficient. In 2003, Car and Driver magazine adopted this metric as a more intuitive way to compare the aerodynamic efficiency of various automobiles.
Drag coefficient (ratio) (ratio) (ratio) economics, top speed, range lower is better for moving into/through a fluid(air/water), higher is better for stopping/redirecting with a fluid Friction or Friction coefficient lbf or (ratio) lbf or (ratio) N or (ratio) acceleration, braking distance, traction, fuel consumption, tyre wear
[1] [2] Informally, it is the sum of the loads resulting from aerodynamic drag, acceleration, rolling resistance, and hill climbing, all divided by the mass of the vehicle. [1] Conventionally, it is reported in kilowatts per tonne , [ 1 ] the instantaneous power demand of the vehicle divided by its mass. [ 2 ]
Drag coefficients in fluids with Reynolds number approximately 10 4 [1] [2] Shapes are depicted with the same projected frontal area. In fluid dynamics, the drag coefficient (commonly denoted as: , or ) 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.
The resulting all-new 1949 production cars were similar to the proposed sketches. [18] The objective was to reduce the automobile's body's drag coefficient by using a smooth shape and enclosed front fenders. [19] Closed fenders were conceived by Nash engineers also in the exploration for added strength of unibody construction.
Best Driver's Car by Autocar; [158] Performance Car by Auto Express. [159] In Australia, the 86 was awarded the following titles in 2012: Car of the Year award by Wheels magazine, [160] Carsguide, [161] and Drive [162] (shared with Subaru BRZ); Best Performance Car under A$60,000 and People's Choice again by Drive; [162]
Today's hybrids are just now catching up to the best cars from 70-80 years ago in drag coefficient, and cutting aero drag is reponsibile for about 70% of their fuel economy improvement over typical gas cars. Slightly reduced weight and a hybrid powertrain along with use of CVT and smaller engine is the rest. This is embarassing.
Mercedes-Benz reported a drag coefficient of 0.19; [7] for comparison, the production vehicle with the lowest ever C d value was the GM EV1, at 0.195. While the Bionic had a much larger internal volume than the EV1, the Bionic's larger frontal area made the EV1 more aerodynamic overall, as drag is a product of the area and the drag coefficient.