Yeaterday after we got the front bulkhead fastened down, we put the arm on and did some more testing. With the arm down and fully extended it would hold a standard tetra without tipping.
But I wouldn't want to drive it around that way. With the arm up and fully extended up the staircase, the robot was very stable holding a vision tetra.
The whole arm only weights 23lbs and a lot of that weight is in the back. The base is the max legal dimensions (with a little wiggle room), altough it may not look like it in the picture. With the monocoque construction, we should be underweight for once.
This would allow us to either put counter weight on the arm or more weight in the back of the base to make it even ore stable.
Mike