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I have a good Idea for a racing robot with minimal parts. The idea is simple: 1. you need 4 motors like the one used here (4WD) 2. paperclip 3. 4 batteries (the weels) 4. wire 5. instant glue Building: 1. glue the end of the motors two by two facing each other 2. connect one of the contacts of the motor to its metal body. first motor connect the (+) to the body and the other motor connect (-) to the body 3. do the same for the other pair of motors 4. solder at least 3 equal length wires from the body of the motor to the (-) of the battery , but the (+) contact facing the motor. 5. connect a wire from the unused contact of the motor to the (+) of the battery. It will start to rotate so you may put a peace of paper for insulation. until it is time to start it. 6. do the same with all 4 batteries 7. use the paperclip to glue the front and rear motors 8. remove all insulating papers at the same time and a four wheel drive car will go. I will be very happy if someone build this :)