yes, the gut wrenching truth has now been exposed........... the silver engines are indeed superior, and heres why....... with the early rockets, factory workers were excited at first, and cared about them, but then after building a whole bunch of em, with no raise, the workers became disenchanted, and then morale sank, and that is why some of the ones with black motors, when you whack the throttle, the engines break loose and fall right out on the ground! true story...........scott