HBX 16889 1/16 2.4 4WD Brushless RC Car with LED Electric Off-Road Truck RTR Model Review Banggood

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HBX 16889 1/16 2.4 4WD Brushless RC Car with LED Light Electric Off-Road Truck RTR Model Review Banggood

Radio-controlled cars (or RC cars for short) are miniature model cars or trucks that can be controlled from a distance using a specialized transmitter or remote. The term "RC" has been used to mean both "remote controlled" and "radio controlled", where "remote controlled" includes vehicles that are controlled by radio, infrared or a physical wire connection (the latter is now obsolete). Common use of "RC" today usually refers only to vehicles controlled by radio, and this article focuses on radio-controlled vehicles only.[1]

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 - brushless motors are more powerful and efficient, but also much more expensive than brushed 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 to work with compared to fuel-driven models, but can be equally as complex at the higher budget and skill levels. Both electric and nitro models can be very fast, although electric is easier to upgrade and more versatile.

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 limited to smooth, paved surfaces. There are also rally cars, which fall somewhere between on-road and off-roadand can be driven on gravel, dirt or other loose surfaces. In the past decade, advances in "on-road" vehicles have made their suspension as adjustable as many full scale race cars, today.

Electrically powered models utilize mechanical or electronic speed control units to adjust the amount of power delivered to the electric motor. The power delivered is proportional to the amount of throttle called for by the transmitter - the more you pull the trigger, the faster it goes. The voltage is "pulsed" using transistors to produce varying output with smooth transitions and greater efficiency. Electronic speed controllers use solid state components to regulate duty cycle, adjusting the power delivered to the electrical motor. In addition, most electronic speed controllers can use the electric motor as a magnetic brake, offering better control of the model than is possible with a mechanical speed control.

Mechanical speed controllers use a network of resistors and switch between them by rotating a head with an electrode around a plate that has electrical contacts. Mechanical speed controllers are prone to being slow to react because they are actuated by servos, waste energy in the form of heat from the resistors, commonly become dirty and perform intermittently, and lack a dedicated braking ability. They appear only in vintage RC models, and are now essentially obsolete.

Most electric cars up to recently used brushed motors but now many people are turning to brushless motors for their higher power output and because they require much less maintenance. They are rated either in relative turns or Kv. The Kv number tells how many RPM the motor will turn per volt. However, the ability of the system to put out power is dependent on the quality of the batteries used, wires and connectors supplying power. Due to their power, brushless motors are also used in bigger monster trucks and 1/8 nitro-powered buggies that have been converted to electric. High quality brushless systems can be much more powerful than nitro and can accomplish feats such as standing backflips when installed in a monster truck, most notably the HPI Savage Flux. Some 1/5 scale gas to electric conversions are in production but are uncommon due to high price.

A new (2012) form of electric r/c racing is MAGracing. Small 1/32 scale cars and powered by rechargeable batteries and steering and speed are controlled by r/c. Extra steering guidance is provided by steel wires hidden in the track surface enabling more accurate steering than is attainable with free running r/c cars. Tracks can therefore be much narrower and smaller making the system suitable for 'in home' racing.