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A slot car (sometimes, slotcar) is a powered miniature auto or other vehicle which is guided by a groove or slot in the track on which it runs. more...

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A pin or blade extends from the bottom of the car into the slot. Though some slot cars are used to model highway traffic on scenic layouts, the great majority are used in the competitive hobby of slot car racing or slot racing. Slot cars are usually models of actual automobiles, though some have bodies purpose-designed for miniature racing. Most enthusiasts use commercially-available slot cars (often modified for better performance), others motorize static models, and some "scratch-build," creating their own mechanisms and bodies from basic parts and materials.

Drivers generally use a hand-held controller to regulate a low-voltage electric motor hidden within the car. Each car runs on a separate lane, with its own guide-slot. The challenge in racing slot cars comes in taking curves and other obstacles at the highest speed that will not cause the car to lose its grip and spin sideways, or 'deslot' and leave the track altogether.

Some enthusiasts, much as in model railroading, build elaborate tracks, sculpted to have the appearance of a real-life racecourse, including miniature buildings, trees and people. Hobbyists whose main goal is competition often prefer a track unobstructed by scenery.

Model motorcycles, trucks and other vehicles which use the guide-slot system are also generally included under the loose classification of "slot car."

How it works

The diagram at left shows the wiring of a typical 1:24 or 1:32 slot car setup. Power for the car's motor is carried by metal strips next to the slot, and is picked up by contacts alongside the guide flag (a swiveling blade) under the front of the slot car. The voltage is varied by a resistor in the hand controller. This is a basic circuit, and optional features such as braking elements or electronic control devices are not shown. Likewise, the car's frame or chassis has been omitted for clarity.

HO slot cars work on a similar principle, but the current is carried by thin metal rails which project barely above the track surface and are set farther out from the slot. The car's electrical contacts, called "pickup shoes," are generally fixed directly to the chassis, and a round guide pin is often used instead of a swiveling flag.

Today, in all scales, traction magnets are often used to provide downforce to help hold the car to the track at higher speeds, though some enthusiasts believe magnet-free racing provides greater challenge and enjoyment and allows the back of the car to slide or "drift" outward for visual realism.

Read more at Wikipedia.org