This is a fully functional, remote controlled subtractor drive with independent turn and drive function. It features: - transparent, "airy" and parsimonious design - "invisible" electricity, all integrated into the mainframe - front and back lights with light switch integrated into the mainframe - double L-motor power (linearly coupled) - front shield - triple speed freely hanging piston motor - self-stabilizing and self-balancing design - can be mounted with any superstructure, e.g. cranes, ...