Martin, the winner of mini-sumo in the Stockholm Robot Championship, reveals some secrets about his robot:

Robot sumo is all about finding the competitor and push him out as quickly as possible.

My robot was built according to a plough concept that evolved from my experiences from the first robot competition I took part in.

The concept can be summarized into two points

1. The plough should be made of a elastic material. When the robot is standing still, the tip of the plough should be in contact with the ground and the plough should be springed, so that if the front of the robot is elevated a bit, the tip of the plough should not lose contact with the ground.

2. The plough should be mounted in as tight angle as possible to the ground.

Sensors, battery and ballast has to fit between the bottom of the robot and the plough. In order to maximize available space for ballast the bottom of the plow is made up of a PCB (Printed circuit board), it doubles as a construction element and electrical conductor between sensors and the steering unit. Cables was kept to a minimum.

The robot was constructed in Autodesk Inventor during the summer of 2016. Two robots where built during the fall, one of which acted as a benchmark and the other one as a experimental with a sliughtly different set of sensors and different motors. Since then the later of the two has won the Swedish championship, and twice the Stockholm championship.

Read more about mini-sumo on Wikipedia.