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There are tow main types of R/C car, one is “On-road” and the other one is “Off-road”. On-road cars are designed to run on smooth terrain, such as a parking lot or a profession racing track. The most common On-road car includes Formula 1, Indy racing car, and touring car. Off-road cars are bassically featured with highter center of gravity than On-road cars and the longer travel suspension system provides the more durable handling

while the ca r is running on a rough ground. It can be categorized into several grades, such as a monster truck with goant wheels and tires, an off-road buggy with extra long suspension arms, or arealistic look rally car. There models are powered either by an electric motor or a nitro gas engine.

2WD
Traction is the resistance or friction happened between each tire and the ground surface. To transfer the motor/ engine power into moving force, an equal amount of traction is needed preferably much more traction than torque. In 2WD, the traction of only two wheels is used. The other two tires have traction as well, but they are just rolling along. In rear wheel drive model (for example Thunder Tiger Uno & DT-10), the front two tires are used to steer the vehicle. If more torque is applied than there is traction available, the 2 tires will break lose and start spinning. Once the tires are spinning, we say "we lost traction". So, if in need of more power/torque to go faster, more traction is needed. So, in 2WD power is divided towards 2 tires and the traction of those two tires has the burden of supporting the motor/engine's power, each powered tire has deal with 50% of the available torque.

4WD
In 4WD (for example, Thunder Tiger EB-4 S3, SSR, SSK, TS4N and TS4E), the power is divided towards 4 tires and the traction at each powered tire has to deal only with 25% of the torque created by motor/engine, transmission, transfer case, and axle. Since each tire in 4WD has to carry a much smaller torque load (25% instead of 50%), it is much less likely for the tires to break lose. That is why a 4WD can climb much steeper grades than a 2WD. Because much more torque is needed to move the car up a steep grade, and only when the torque load is spread out over 4 tires instead of 2 tires, it is supported by sufficient traction.In order to use the traction of all 4 tires to drive on surface with marginal traction, differential locks and traction control are needed, and all driven axles must have a differential to make it possible in turn to send more rpm and more torque to the outside wheel

For the electric cars, you'll need a battery pack and a charger for the start. Most cars don't come with either one; it would make the kits too expensive. The most useful char-gers for beginners are units that will charge five-cell and six-cell packs, and can operate from house current as well as 12-volt sources.For the gas-powered cars, it's much more complicated and require more supporting equipment, i.e., a glow starter, fuel, and even an engine starter. It's important to break-in your glow plug engine prior to you start operating. When racing your car, you can get the fuel that contains up to 50% of nitro, but it isn't necessary for running under usual condi-tions. Most of cars

engines develop enough power from 15-20% of nitro to set records.
Furthermore, you'll need to equip yourself with a few basic tools to do the job right. First, you should prepare some screwdrivers: a hobby knife, and a small finger-size driver. You should also have different sizes of Phillip screw driver, and needle nose plier. These small hand tools are neces-sary for the assembly of most R/C cars.

Every Thunder Tiger R/C car comes with a complete and step-by-step diagram instruction manual in the box, which provides comprehensive and well-detailed necessary knowledge of operating cautions for the user, engine break-in tips to assembling hints. By following theinstructions, the preparation job will becomemuch easier and enjoyable.All these manuals could bedownloaded from ThunderTiger`s website download section.
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