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).
Drive
— Full. As the name implies, in such models, traction from the engine is transmitted to all 4 wheels. The main advantage of this scheme is its high cross-country ability: the machine keeps well on difficult terrain, and even getting stuck with a pair of wheels in the air is not critical for it. Also, four-wheel drive can be used for drifting (see "Appointment (class)"), although it loses a little in this role to the rear one; however, a lesser tendency to drift can be an advantage. Its main disadvantage is the rather high cost associated with the difficulties in production. In addition,
4WD vehicles tend to be less fuel efficient than "single wheel drive" vehicles.
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Rear. Models with power transmission from the engine to the rear pair of wheels. This scheme is quite unstable and requires careful control at high speeds — if you turn too sharply, the car easily goes into a skid. On the other hand, it is precisely because of the instability that this option is considered optimal for drift racing, and the design of the rear-wheel drive is very simple, reliable and inexpensive. As a result, most non-4WD RC models use it.
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Front. The front-wheel drive has a high degree of stability: you can only send the car into a skid intentionally (and then you need to try hard), and the withdrawal from it is extremely simple. At the same time, stability is not always a
...n advantage — for example, in drifting, it only creates additional problems. In addition, the design of such models is quite complex due to the need to combine the drive from the engines and steering on the same pair of wheels; as a result, in terms of price, reliability and ease of maintenance, they lose to rear-wheel drive. Therefore, front-wheel drive is not widely used in radio-controlled cars.Radio frequency
The frequency at which the transmitter of the model control box operates.
— 27.145 MHz. One of the frequencies used for radio remote control for a long time; in some CIS countries it is even reserved by state regulatory bodies for this very purpose. Such transmitters are relatively inexpensive, but suffer from one serious drawback: they do not provide channel separation when several consoles are operating in close proximity to each other. In other words, if the machine stays in the coverage area of two transmitters, the signals from them will be mixed, which is actually tantamount to a loss of control. This is most often unimportant for recreational models, however, in competitions with several cars on the track at the same time, it can create serious problems and requires tricks with the design of the frequency grid and the use of interchangeable crystal oscillators. As a result, in professional motorsport, this frequency is gradually being replaced by the more advanced 2.4 GHz standard.
Separately, we note that among car models there may be transmitters with frequencies of 35, 40 and 75 MHz; according to the main features, they are completely similar to the described 27.145 MHz and differ only in the operating frequency.
— 2.4 GHz. The most advanced communication standard to date, used by remote control cars. Its main feature (and difference from those described above) is the possibility of normal operation of several transmitters of this...format in close proximity to each other. To do this, various technologies are used that provide automatic distribution of receiver-transmitter pairs over their own channels (similar to how it happens, for example, in mobile communications). Theoretically, the 2.4 GHz band may be more prone to interference, as many modern electronics work in it (in particular, Wi-Fi and Bluetooth modules); however, due to the aforementioned distribution of channels, such problems arise only in very unfortunate cases.
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.
