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Radio-controlled car
Radio controlled (or ''R/C'') cars are battery/gas-powered model cars or trucks that can be controlled from a distance using a specialized transmitter or remote. The term "R/C" has been used to mean both "remote controlled" and "radio controlled", where "remote controlled" includes vehicles that are connected to their controller by a wire, but common use of "R/C" today usually refers to vehicles controlled by a radio-frequency link. This article focuses on radio-controlled vehicles only.
Cars are powered by various sources. Electric models are powered by small but powerful electric motors and rechargeable nickel-cadmium, nickel metal hydride, or lithium polymer cells. There are also brushed or brushless electric motors. Most fuel-powered models use glow plug engines, small internal combustion engines fueled by a special mixture of nitromethane, methanol, and oil (in most cases a blend of castor oil and synthetic oil). These are referred to as "nitro" cars. Recently, exceptionally large models have been introduced that are powered by small gasoline engines, similar to string trimmer motors, which use a mix of oil and gasoline. Electric cars are generally considered easier for the novice to work with compared to fuel-driven models, but can be equally as complex at the higher budget and skill levels.
In both of these categories, both ''on-road'' and ''off-road vehicles'' are available. Off-road models, which are built with fully functional off-road suspensions, and a wide tire selection, can be used on various types of terrain. On-road cars, with a much less robust suspension, are strictly limited to smooth, paved surfaces. In the past decade, advances in "on-road" vehicles have made their suspension as adjustable as many full scale race cars, today.
==Toy-grade R/C cars==
Toy-grade R/C cars are typically manufactured with a focus on design coupled with reducing production costs. Where as a hobby-grade car has separate electronic components that are individually replaceable if they fail, toy grade cars are typically made with components harder to find as spare parts and a single electronic circuit board integrated into the design of the vehicle. Although hobby-grade enthusiasts look down on toy-grade R/C cars, their maintenance is much easier than of the hobby-grade models since number of components is drastically smaller, and parts can be harvested at almost no cost from any R/C toy car of the similar size. Performance tends to depend on price, but with addition of hobby-grade type of batteries (LiPo) toy R/C cars can get up to 1/2 the speed of comparable hobby-grade car for 1/5 of the price. Stock toy-grade cars are equipped with weaker motors and are powered by alkaline or NiCad batteries which means their top speed is usually only 5-15 mph. Cheaper ones lack any form of a suspension and the ones that do feature a suspension have very primitive or rudimentary designs. Steering is typically not proportional (with only three positions: straight, full left, and full right) and there is typically no proportional "throttle" either, with stopped and full power usually being the only options. With all the disadvantages, toy-grade R/C cars are a great intro to the hobby, especially for ages 5 – 10, and are cheap platform for modifications and tuning even for older enthusiasts.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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