Re: pic: BeachBot Pseudo-Crab drive, partially assembled
 

We thought of the same thing. But also ruled it out due to the shadyness of the rule about the fixed bumper location.

Re: pic: BeachBot Pseudo-Crab drive, partially assembled
 

"Fixed" relative to what? Since all the other parts of the trailer hitch constraints seem to revolve around the bumper perimeter, I would be inclined to say that the bumper perimeter would be the most logical point of reference. In the case of 330's design, this is a fixed point.

As a side note, 230 had a similar design except that their outer frame is free spinning and the robot rotates inside of it. They were allowed to compete at Boston, and I would consider it legal for the same reason as stated above.

Re: pic: BeachBot Pseudo-Crab drive, partially assembled
 

All things considered, this looks to be a great platform. Well done.

See you in Vegas!