James, bring it along and we can have a look, the arena is fully enclosed and stu is correct we have had M2 and Ripper flipping it against the walls and roof.

SO a 12kg feather hitting the roof would be nothing more than spectacular.

If we had concerns about things escaping then the arena would have been upgraded.

JOnno
http://www.roamingrobots.co.ukwww.roamingrobots.co.uk