This is a fully functional, remote controlled subtractor drive with independent turn and drive function which are separately powered. It is up on LEGO Ideas - support it if you like it, there you will find some more high-resolution photos :) https://ideas.lego.com/projects/101126 This is a fully functional, remote controlled subtractor drive with independent turn and drive function which are separately powered. It features: - robust design with custom-made differentials that can handle larger forces - transparent, "airy" and parsimonious design - "invisible" electricity, all integrated into the mainframe - front and back lights with light switch integrated into the mainframe - quadruple L-motor power (two linearly coupled blocks of two motors each) - front shield - triple speed freely hanging piston motor - self-stabilizing and self-balancing design - can be mounted with any superstructure, e.g. cranes, hoists, levers Constructed to an 11/15 measure, fully compliant with the rules of LEGO. Only official LEGO parts are used and no parts are modified or altered. Weight: about 4 lbs, dimensions ca. 30 x 25 x 30 cm The chassis can be used as a basis for basically any vehicle that has to traverse difficult terrain, e.g. building machines, bulldozers, search & rescue vehicles, etc. It is designed to provide a multipurpose solution for a variety of tasks. If fitted with different superstructures on top, countless models can be constructed.