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NXT High-Mobility . A high-mobility vehicle inspired by Brian Davis's LNE and the iRobot Packbot. . This vehicle employs two pairs of treads with an articulation in the middle. The treads are in-line, such that the degree of movement of the articulated unit (unit without the NXT) is a mere 180 degrees as compared to Packbot's 360+ degree movement. The NXT HM, however, still allows a great range of movement and easily conquers high bumps and even staircases. A close-up of the articulated unit displays its workings. A set of gears tranfers power from the two drive motors between all four treads. To raise or lower the articulated unit, a single motor is moved. Because the weight of the rear unit is greater than that of the front articulated one, the motor raises itself and the articulated unit alongside it. An aerial view of NXT HM showcases its aesthete. Another view of the articulated unit's movement, and how the front treads are connected to the C motor. The rotary end of the C motor is attached to the rear unit so that the motor lifts only the articulated, front unit. The weight of the NXT in the back helps the C motor (the articulation motor) to keep the rear end stable, such that it only moves the front unit. A bird's-eye view of NXT HM displays its relatively compact base. The motor which powers the articulated unit does not interfere with the drive. Because it moves the entire front unit as one whole, it is difficult to break the front articulated unit.

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