LEGO MINDSTORMS Robot Inventor
Mini-tractors race around in circles while the hub turns on a pivot to follow the action.
Races are usually clean and evenly matched when racing two tractors. Add a third tractor, and things get more interesting...
Something to Try:
If you shorten the wire leading to one of the tractors by twisting or clipping it, that tractor will take an inside line and try to pass...