Model scale
The scale allows you to estimate the overall dimensions of the model — it describes the ratio of its dimensions to the dimensions of a full-size machine of a similar type (see below). For example, the length and width of a full-sized buggy average about 4 m and 2 m, respectively; this means that for a radio-controlled model on a scale of
1:10, these parameters will be 10 times smaller — about 40 cm and 20 cm (plus or minus).
Miniature scales are considered to be
1:24 or less (
1:28 and
1:32), while in the largest scales it reaches
1:6(
1:5) — such models are not much smaller than children's cars (however, they are not intended to replace them). A small size is considered optimal for use in residential areas, a large one — in open areas. Most road models (see 'Type') are available in 1:10 scale, SUVs in
1:8, and larger scales are found in advanced internal combustion engine models (see 'Engine'). The most common scale options are
1:14,
1:16 and
1:18, which are found in both the low-cost and high-end segments.
Max. speed
The highest speed that the machine can develop. Usually, this parameter is indicated for certain "perfect conditions": a flat track, high-quality fuel or a full battery charge (depending on the type of engine, see above), etc. Real figures tend to be somewhat lower; however, different models can be compared with each other according to this characteristic.
High maximum speed is important primarily for "racing" cars (ring and short-course, see above); in stunt and drift models, it does not play a decisive role. Also, you should pay attention to the maximum speed values when buying an amateur model for entertainment — here you need to take into account the features of its application. For example, if the machine is intended for a 3-4 year old child as a toy in an apartment, high speed will not be an advantage, but a disadvantage (especially since the cost of the “apparatus” directly depends on its speed).
Range
The greatest distance between the remote control and the machine, at which the transmitter of the remote control is still able to guarantee normal controllability of the model. Note that official specifications usually provide data for perfect conditions: full battery charge, no obstacles in the signal path, extraneous interference, etc .; in fact, the range may be somewhat less. However, according to this parameter, it is quite possible to compare different models of radio-controlled cars with each other.
The higher this indicator, the farther you can let go of the machine from the remote control, the less often you have to move to keep control. However, a large range means not only a long range as such — it also speaks of a good signal penetration, its ability to pass through various obstacles.
Power source
The type and number of batteries required for the operation of the model control panel.
— AA. Replaceable cells, known in everyday life as "finger-type batteries". They can be produced not only in the form of disposable batteries, but also in the form of rechargeable batteries. In both cases, they are available in a wide range of items that differ in price and quality, which gives freedom of choice; batteries are sold almost everywhere and are inexpensive. The power and capacity of AA elements are relatively small, but in most cases they are quite enough for normal operation of the transmitter for quite a long time. Usually, modern remotes require several of these batteries — usually 2, 4 or 6.
— AAA. Replaceable cells, known as "mini finger" or "little" batteries. From the AA batteries described above, they differ only in their smaller size and, accordingly, in their capacity; the rest are completely similar. They are mainly used in remotes for inexpensive entertainment models: such remotes do not require a lot of energy, but compactness is sometimes crucial.
— PP3. Replaceable batteries of a characteristic rectangular shape, with a pair of contacts on one of the ends. They have a nominal voltage of 9 V. Such elements are quite popular in "entertainment" models designed for children — not least because only one battery is enough for the remote control.
— Accumulator. In this case, a specialized battery is meant, either of an original d...esign, or in a size that is not related to replaceable elements. These power supplies can be far superior to battery packs in terms of power and capacity, but they are not cheap, and such advanced features are rarely needed in fact. Therefore, battery remotes are found mainly among large-scale professional-level models, with increased requirements for the range and reliability of the transmitter on the remote control.
