This is something that you'll need to ask on a case by case basis with the event organisers. The first ever event I went to with The Honey Badger 1.0, the horizontal spinning bar/flail weapon (which I really should have clarified with them beforehand) was queried. I did eventually get permission to run it at half power only, not that it made that much of a difference. :P

The reason for this is because Robots Live!'s arena has got a mesh type roof and wooden flooring which, if a spinner made a good hit, would simply not have contained. Extreme Robots also have restrictions but they do have a steel floor and polycarbonate roofing. Robochallenge have a similar setup to Extreme Robots but smaller I think.

The rules does have it's own section on spinners and what is excluded under section 11 but always, you need to ask the event organisers in advance before turning up to the event as to wherever your weaponry is allowed or not if in doubt or not.