What is Radio control car
1. RC car
A radio-controlled car (R/C car) is a car driven from a distance using a radio control system. Inputs from joysticks on a transmitter are sent to the car's onboard receiver. The receiver interprets the radio signals and sends electrical pulses to the servo and electronic speed controller, making the model turn its wheels and the motor run.
R/c cars are classified as following type Electric and IC engine.
Electric:
Electric cars 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.
IC Engine:
The cars that are powered with engines are called as Nitro-powered RC car.They use methanol as a basic fuel with a percentage of nitro methane as booster and castor oil for lubrication.Nitro cars are completely air cooled, and may be run continuously with no need to take breaks for cooling down. Nitro cars tend to be larger than electric cars on average.
Working:
All cars require a transmitter, which has the joysticks for control, or in pistol grip form, a trigger for throttle and a wheel for turning, and a receiver which sits inside the car. The receiver changes the radio signal broadcast from the transmitter into suitable electrical control signals for the other components of the control system. Most radio systems utilize amplitude modulation for the radio signal and encode the control positions with pulse width modulation.The radio is wired up to either electronic speed controls or servomechanisms which perform actions such as throttle control, braking, steering, and on some cars, engaging either forward or reverse gears.Electronic speed controls and servos are commanded by the receiver through pulse width modulation; pulse duration sets either the amount of current that an electronic speed control allows to flow into the electric motor or sets the angle of the servo. On the models the servo is attached to at least the steering mechanism; rotation of the servo is mechanically changed into a force which steers the wheels on the model, generally through adjustable turnbuckle linkages. Servo savers are integrated into all steering linkages and some nitro throttle linkages. A servo saver is a flexible link between the servo and its linkage that protects the servo's internal gears from damage during impacts or stress.Fuel powered models utilize a servo for throttle and braking control; rotation of the servo in one direction will cause the throttle on the carburetor to open, providing more air and fuel mixture to the internal combustion engine. Rotation of the servo in the other direction causes torque to be applied to a piece which causes friction with the braking material. The brake is located on the driveshaft and stops only two wheels on a two-wheel drive car and all four wheels on a four-wheel drive car.
The whole machine is divided into three major categories:
1) Engine
2) Chassis and Suspension
3) Control
Engine:
Most of R/C models use a 2- or 4-stroke glow engine, sized specifically for that model. Glow engines have a simple ignition system that uses a glow plug rather than a spark plug so there’s no coil, magneto or points. The glow plug is heated by a battery-operated glow starter. When fuel enters the combustion chamber, it’s ignited by the heated glow plug.The engine’s carburetor supplies the fuel and air needed for combustion. It has several adjustments. A rotating throttle arm controls the amount of fuel and air that enters the combustion chamber. The high-speed needle valve controls the mix or proportions of fuel vs. air at mid- to high-speeds. The idle mixture screw is similar to the high-speed needle valve, except that it controls the mix of fuel and air when the engine is only idling.
The chassis should be light in weight, strong and also able to accommodate all the components. It can be made of aluminum or carbon graphite. The chassis should bear the whole weight of the car. So it should be rigid and also accommodate the other forces acting on it.
The basic components of a car are
1) a) Rear drive shaft or dog bone b) Front dog bone
3) Center bulkhead.
4) Fuel tank
5) Center differential and spur gear.
6) a) Rear chassis brace
b) Front chassis brace
7) Servo tray
8) Battery and receiver box
9) Rear shock tower. The shock tower has many different mounting holes for both the shock and camber link.
10) Rear camber link – turnbuckle (adjustable)
11) Rear hub carrier.
12) Rear suspension arm.
13) Rear sway bar.
14) Rear CVD shaft.
15) Rear hub.
16) Rear differential housing, differential and rear bulk head.
17) Rear springs.
18) Rear shocks
19) Upper and lower pivot/pillow balls. They thread into both the upper and lower A-arms. This gives you the ability to change camber.
20) Front CVD
21) Front lower suspension arm
22) Upper suspension arm - A-arm.
23) Front shock tower.
24) Front drive shaft or dog bone.
25) Steering knuckle.
26) Front hub.
27) Front sway bar.
28) Front differential, differential housing and bulkhead.
Suspensions:
The main component of a suspension is its springs. Coil springs are used commonly. These are usually placed around the damper housing to form a spring-damper unit. A spring is an elastic device that resists movement in its direction of work
The main job of the suspension system is the following,
Maintain the ride height
1. To provide damping
2. To give the best suspension travel for a typical car
3. To prevent the car from rolling
4. To protect the car and all its components
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