im the expert on this stuff but the turns are the number of times the wire inside is wrapped around the armature i believe and for just running around driveway and street and stuff i would recommend like 14-23 turns because they arnt too fast but also arnt to slow...the lower the number of turns the more top end u will have and the higher the turns the more torque...also the more magnets inside i believe helps out(for example: quad magnet would be better than duel magnet)...as for the single double and triple i am not completely sure so i wont confuse anybody escpecially myself...i hope this helps some.