All types of racing cars have different types of motors. Some have single or some have double. It is really confusing to try to sort out difference between a single our double motor car. Plus a newbie into world of remote control cars gets easily disoriented with what is a 13 turn double or a 13 turn singleÖ?
Well, in plain speaking language it refers to number of times wires are wrapped around armature. A 13 turn double would be 2 strands wrapped 13 times. A 13 turn single would be 1 wire wrapped 13 times. The double wires have more torque where as single wires have more speed. In general, it means that more turns means more torque but less speed and vice versa. Thatís lower turns means lower torque and greater RPM. The number of winds describes how abruptly motor accelerates. Fewer winds would mean less abrupt acceleration and more winds would lead to smoother accelerations.
Torque basically refers to how much a force is acting on motor that causes motor to rotate. If there is more than one force acting on a motor then each of these forces shall apply torque. The net torque acting upon motor shall be sum total of all forces or torques acting upon a motor. It is usually required for cars racing on twisted tracks.
Remote control cars come with two kinds of motors: ones with brush and ones without i.e. Brushless. The brushless motor has windings located around outside of motor and magnets are located on moving motor shaft. A brushless motor does not provide any friction therefore provides higher RPM. But a brushless requires a lot of processing power thatís why it has not been a great success with RC trucks or cars.