[Tom Bishop]

It has been my experience (and I have pretty extensive experience with Frisbees, misspent youth and all that) that most Frisbees land right side up when the are thrown, even when thrown at high angles. The major exception is when you throw and it rolls, or when you throw an overhand tomahawk, then they they tend to come to rest upside down.

I also spent some time throwing at a wall and all of the throws landed up right. Those Frisbees have quite a bit of bounce in them.

Now mixing robots and Frisbees might change things, but I think the whole upside down Frisbee deal is a bit overblown. If its upside down just don't pick it up!