Sequence Boundary The sequence boundary is an unconformity updip and a correlative conformity downdip. Where it is an unconformity, it is a surface of subaerial exposure and erosion; however, the expression of those features in an individual outcrop may or may not be obvious.
The brushless motor provides greater reliability and efficiency for its low weight and size as compared to the brushed motors. Efficiency for the brushless motor is typically between 85-90% while that of the brushed motor ranges between 75-80%.
This is what PWM means when referring to DC motors. The Handy Boards DC motor power drive circuits simply switch on and off, and the motor runs more slowly because its only receiving power for 25%, 50%, or some other fractional percentage of the time. A servo motor is an entirely different story.