Unigamer writes “Inspiration for building a car from K’nex came when I wanted to make an R/C Car easily and cheaply. My dad has an old Tamiya Cheetah which I used for parts like the servos, and Remote Control Equipment. If you are planning on doing a project similar to this you will probably need good quality proportional control Radio Control System and a basic knowledge of R/C vehicles”. Link.
HOW TO make a K’nex Remote Control Car