What the heck are rc car servo, brushless servo motor and frequency crystals? Do they have any use in an rc car?

RC car Servo

Futaba Servo

The rc car servo is a small mechanical motor with decide the speed and direction the car will travel.
A gas car has two servos, one connected to the carburetor, another to the steering mechanism.
The servo connected to the carburetor controls the speed of the car. It also controls the braking mechanism.
The second servo is connected to the steering mechanism, controlling the direction of the car’s front wheels.
As for doing servo motor repairs, it would be advisable to consult an expert.

RC car Frequency Crystals

Frequency Crystals

The transmitter sends signals to the receiver on a specific frequency. Removable frequency crystals, located at both the transmitter and receiver, determine this frequency.

An rc crystal mhz may be in the works in the near future.

Tip:
Be careful, the crystal with an Rx label is used for the receiver, and the Tx label for the transmitter. The purpose of these frequency crystals is to ensure that signals from car do not interfere with signals for another car. For example, if you are using a frequency of 27.255, make sure no one nearby is using the same frequency.

Operating two cars next to each other using the same frequency will cause loss of
control and cause the cars to crash. Make sure that the people you play with are on a
different frequency than what you are using.

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