[Ken Streeter]

Originally Posted by 1075guy

Really, just net the alliance station walls too. Problem solved. You dont need ceiling access to the venue, just build the alliance walls so that the end uprights have a 10+ft vertical extension to hold a net across.

At the "Week Zero Scrimmage" in Nashua, NH with the official FIRST field, there were nets set up at either end of the field, in addition to the side nets.

I can't remember exactly where these were, but I believe they were placed just behind the back of the driver station / human player area. In other words, frisbees would be prevented from going out into the stands. I can't recall just how high they were, but I think they were the same height as the ones at the sides of the field. With that additional netting, I think FIRST has done a pretty good job of containing frisbees.

I don't remember if close-range shooters (thus steep angles) making high velocity shots that missed the top goal were going over the top of the net or not. I'm sure the people working field reset would remember, though!

In all honesty, I think the only big problem with frisbees escaping from the field were the human player throws in the last 30 seconds (the "blizzard") which has been largely addressed with the rule update making such throws valid only with colored discs, limiting the quantity of such throws and thus encouraging better accuracy from human players, rather than having them simply try to get rid of as many as 30-50 left over frisbees in 30 seconds. (At the Week Zero tournament, there were often many, many frisbees left over, since the robots were still frequently incomplete or only partly functional.)