You're right, there's a gearbox on the brushed motor and not on the brushless one. The gearbox is the part with the shaft sticking out, and the motor is the pa

You're right, there's a gearbox on the brushed motor and not on the brushless one. The gearbox is the part with the shaft sticking out, and the motor is the part with the heatsink fins. And you can buy the motors already! We are using a slightly modified version of a RC airplane motor. Our first prototypes used motors we bought at a local hobby shop.