[DonRotolo]

Indeed. 40" diameter was a shock to us, so we posted the photo (and, it seems, so did several others) so teams would get an idea of that dimension.

It's also somewhat heavy (I guess 7-10 pounds, some have weighed theirs in at about 8 pounds) and the outer covering is a bit slippery (but not a lot). The problem with a human holding it is that you really can't wrap your arms around it, so at best you're grip is less than 180 degrees apart. It definitely can get away from you easily.

We also did some experiments launching it to about 8 feet in the air, from about ground level. That takes quite a bit of push. This means that a catapult is feasible, but it'll have to be substantial - no latex tubing or air cylinders here.

Don