ever built or played with a small r/c car and got nowhere but a very flat surface? those little cars can't go much of anywhere and can't carry much of anything either, what you need now is a heavy duty vehicle. Now your in the Pro league. This Instructible will teach you the basics of what you might electronically need to build such a vehicle.
Step 1: Electronics
This will include the all the necessary components to control the bot.... you will need motors around 12v, the motor-controllers that change their speed, signal boosters (for use in my set up),Tx & Rx ( transmitter and receiver),tank signal mixer, main power source, battery for Rx, and chargers for all power sources.(also a fuse or breaker is needed for safety)
Step 2: Motors
The motor i used is from http://www.vexrobotics.com/vexpro
, this company offers many of the parts needed to drive this project. well not just any 12v motor can work this hard. you will need something with a little more 'Umph' or 'kick' you will need a motor that can supply the torque and speed you need for your desired vehicle.other motors you can use can be scooter motors,electric car motors, and any other large motors. Along with the motors you will need an equally qualified ESC ( motor controller), that can handle the amp draw of the system.....
Step 3: Esc
these are the ones i used for my motors... they can be any make , but they have to be able to stand up to the amp draw.( once again from Vex pro )standard receivers will not be able to transfer the signal, so you will need a signal booster...
Step 4: Signal boosters
simple inline booster used for in between Esc and Rx....
-PWM Signal Driver
Step 5: Transmitter and receiver
any transmitter you have will do.if you do not have one ,for a cheap and reliable system, i would recommend Spectrum 2.4ghz radio with receiver.... i use it for all of my new r/c projects.