[EricH]

Originally Posted by gorrilla

the robots were also heavier...

2005(?) is the year they chaged it to 120?

Lighter, you mean. You see, before 2004, the robots had to be 130 lb with the battery included. However, variances in the batteries could cause a robot to be 135.0 when weighed, and 135.9 when competing with a different battery. So, in 2005, the rules were changed: 120 lb sans battery. The batteries were about 12-13 lbs each, depending on a number of factors, like which battery did you have when you made the measurement. Net of +2-3, but as I figured at the time (we allowed 15 lb for the battery in 2003), we got 5 extra pounds.

At the same time, the size changed (30x36 to 28x38 base dimensions).

Now, the robots are even heavier, with an extra 15-lb allowance for bumpers. I doubt the weight will go up again...