bl=brushless. when people say that they are meanin a motor that has no brushes, springs,or what ever a mod motor has dat need replacement.a brushless is the way to go it you have 230 dollar.(for a novak bl) you get the speed of a 10turn motor(lower the turn the faster)and run time of a 3400mah battery if running 3300.and i think with dual motors its mainly tourqe and you will get less runtime. but yea when you get done post some pic. up!!