Friday, 1 July 2011

SPORTS CAR

Sport Cars:

A sports car is a small, usually two seat automobile designed for high speed driving and maneuverability.Sports cars have been either spartan or luxurious, but good handling, minimum weight, and high performance are requisite.

Early history:

The sports car traces its roots to early 20th century touring cars. These raced in early rallys, such as the Herkomer Cup, Prinz Heinrich Fahrt, and Monte Carlo.

The first sports cars are considered to be (though the term would not be coined until after World War One) the 3 litre made in 1910 Vauxhall 20 hp (15 kW) and 27/80PS Austro-Daimler (designed by Ferdinand Porsche).

These would shortly be joined by the French DFP (which became sporters after tuning by H.M. and W. O. Bentley) and the Rolls-Royce Silver Ghost. In the U.S. (where the type was variously called roadster, speedster, runabout, or raceabout, there was Apperson, Kissel, Marion, Midland, National, Overland, Stoddard-Dayton, and Thomas among small models (which today would be called sports cars), while Chadwick, Mercer, Stutz, and Simplex  were among large ones (which might today be called sports sedans or grand tourers).

The drive train and engine layout significantly influences the handling characteristics of an automobile, and is crucially important in the design of a sports car.

The front-engine, rear-wheel drive layout (FR) is common to sports cars of any era and has survived longer in sports cars than in mainstream automobiles. Examples include the Caterham 7, Mazda MX-5, and the Chevrolet Corvette. More specifically, many such sports cars have a FMR layout, with the centre of mass of the engine between the front axle and the firewall.

In search of improved handling and weight distribution, other layouts are sometimes used. The RMR layout is commonly found only in sports cars—the motor is centre-mounted in the chassis (closer to and behind the driver), and powers only the rear wheels. Some high-performance sports car manufacturers, such as Ferrari and Lamborghini prefer this layout.

Porsche is one of the few remaining manufacturers using the rear-engine, rear-wheel drive layout (RR). The motor's distributed weight across the wheels, in a Porsche 911, provides excellent traction, but the significant mass behind the rear wheels makes it more prone to oversteer in some situations. Porsche has continuously refined the design and in recent years added electronic driving aids (i.e. computerised traction-stability control) to counteract these inherent design shortcomings.

Some sport cars have used the front-engine, front-wheel drive layout (FF), e.g. Fiat Barchetta, Saab Sonett and Berkeley cars. This layout is advantageous for small, light, lower power sports cars, as it avoids the extra weight, increased transmission power loss, and packaging problems of a long driveshaft and longitudinal engine of FR vehicles. Yet, its conservative handling effect, particularly understeer, and the fact that many drivers believe rear wheel drive is a more desirable layout for a sports car make this layout atypical to high-performance sports cars. The FF layout, however, is common in sport compacts and hot hatches, and cars in general (excepting sports cars).

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