Craig: If people deliberatly build to 102kg empty I wouldnt be happy either.

There are heavyweights in Holland and Germany (please dont forget our GRA friends, remember Tsunami?) that would have a pretty much impossible task of getting their weight down. If these robots are covered by a Grandfather rule that would be great. I am still not sure how much of an old robot would constitute a grandfather robot though.

For instance, I bought Hannibal, a series 5 robot. After 1 demo fight we ripped out pretty much everything that was originally in there, except the motors and the wheels, and replaced it with new stuff. So pretty much the only thing left original was the shell and the motors and the wheels. Is that still a Grandfather robot? My first instinct is no. But what if I had only changed speed controllers? Then Id say yes.

How far do you need to alter your robot not to be considered a Grandfather robot?