'Ask the EO's what they will allow you to run and build to that' was going to be my method of working with concepts I have had.

I have asked Alan if he would let me run a chop saw in his arena. At 40 RPM on a 300mm Disc the tip speed is very low but the energy involved would be quite high. At the time the answer was 'Yes but check with me before you bring it to an event'. Things may have changed now.

It would also depend on the weapons intention, ie: is it a rotary flipper or some kind of grinding saw, its mass and how it was built.