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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.
The Aptera has a claimed coefficient of drag that is very low, at 0.13 as of January 2023. [15] The car was tested at an Italian wind tunnel, the results of which were described by co-CEO Chris Anthony as "pretty pictures".
The Sprint Speciale has a drag coefficient of 0.28, [5] the same as a modern day Chevrolet Corvette (C6), which was not surpassed for more than twenty years. The engine is a 1,290 cc (1.3 L) Alfa Romeo Twin Cam engine , a 4-cylinder design with hemispheric combustion chambers and valves controlled directly by twin overhead camshafts.
Flat spoilers, possibly angled slightly downward may reduce turbulence and thereby reduce the coefficient of drag. [5] Some cars now feature automatically adjustable rear spoilers, so at lower speed the effect on drag is reduced when the benefits of reduced lift are not required.
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.
The height of the car's body is lowered by 5 mm (0.2 in), it has specifically designed alloy wheels and the drag coefficient has been reduced to 0.23 for less drag force. [61] The Giulia "AE" Advanced Efficiency is fitted with specific 205/60 R16 tyres for reducing rolling resistance. It was discontinued beginning with 2019 model year. [62]
The lowest of the three cars' drag coefficient was 0.19, [2] an achievement even by today's standards. For each of the cars, Alfa Romeo provided a five-speed gearbox and a powerful four-cylinder engine that produced more than 90 horsepower (67 kW), good enough to propel the car to a top speed of 125 mph (201 km/h).
There are large vehicle blind spots behind the car's pillars. [14] It has a 50/50 weight distribution and a drag coefficient of 0.32 (Cd). [13] Euro NCAP classify it as a large off-road car. [2] In order to reduce the weight of the car, aluminium is used for body panels, as well as for mechanical parts such as the suspension, brakes, and engine.