Types of Motors
RC motors are available as either brushed or brushless (BL).
Brushed motors are cheaper and less efficient, requiring more maintenance. Brushed Motors are generally not as powerful and always less efficient than Brushless Motors. They can run in water, but it severely shortens the intervals between maintenance. Brushed motors are rated by the number of turns (t) they use. In general, lower turns means more power. Most stock motors are in the 19t-30t range while high performance motors will be 5t-12t.The most common maintenance needed to be done on a brushed motor is on the brushes, hence the brilliance of Brushless Motors.
Brushless motors are faster and more efficient, which means they’ll run longer on a single battery charge. The trade-off is that they are significantly more expensive than brushed motors. BL motors are rated by KV, with higher ratings equaling higher max RPM. Note that “faster” is not always better, since heavy vehicles actually do better with lower KV rated motors, which don’t spin as fast, but have more torque. Faster spin can also mean higher chance of the expensive magnet that spins in your motor becoming demagnetized. That’s right, the magnets in these motors actually spin. That’s because they’re built almost the opposite of conventional or brushed motors.
With all RC motors you’re going to want to be aware of the size of the can and the rotor. You’ll want to get pinons that fit on the rotor and since they differ in size, pay attention!