Build Your Own Combat Robot

Chapter 13: Robot Sumo 279
International Sumo Class Mini Sumo Class
Length 20cm 10cm
Width 20cm 10cm
Height Unlimited Unlimited
Mass (maximum) 3kg 500g
Sumo Ring Diameter 154cm 77cm
Border Ring 5cm 2.5cm
TABLE 13-1 Robot Sumo Specifications �
The size specifications of the bots only apply at the beginning of a competition
round. Once the round has started, the bot can expand in size as long as its weight
does not exceed the maximum, and all parts of the bot must remain attached together.
This rule allows for some interesting design options. For example, a bot
can have a pair of arms that deploy sideways to try to help capture its opponent.
Since there is no height limitation, bots can have very long arms.
According to the rules, sumo bots must move continuously. Another rule states
that the bot cannot be sucked down or stick to the sumo ring. This particular rule
has resulted in many different interpretations. Basically, what it means is that
builders can’t use any adhesives to “glue” the bot to the surface of the ring, or use a
vacuum suction cup to “suck” it to the ring. A literal interpretation of this rule
states that if a bot is “glued” or vacuum-sucked onto the ring, then the bot is no
longer moving continuously and will thus automatically lose.
But what if the robot can still move, despite being “glued” down? Because of
the “continuous move” rule, some bots use vacuum systems to help pull the robot
down to the sumo ring, and use sticky substances on the tires to increase traction.
As long as these methods allow the bot to continuously move, and do not damage
(or leave a residue on) the sumo ring, they are allowed. Some robot sumo contests
have very specific rules that prohibit the use of sticky wheels and vacuum systems.
The official rules for international robot sumo are maintained by Fujisoft ABC,
Inc., in Japan. The Web site for the rules can be found at www.fsi.co.jp/sumo-e.
The official rules for mini sumo are maintained by Bill Harrison of SineRobotics
at www.sinerobotics.com/sumo.
Most robotic clubs have the same rules posted on their Web sites, along with
any special amendments to the rules that are club specific. An excellent illustrated
guide to American robot sumo, created by David Cook, is located at
www.robotroom.com/SumoRules.html. This guide also lists several of the robot
sumo clubs throughout the world.