No speed limits or ground-proximity rules for any class.
Safety should be the concern, and as such, both speed and ground proximity are site-dependent. At fields where speed is or could be an issue, they are already not certified for turbine operation.

IMHO, DB and the AMA have grown VERY big heads since they killed SFA and have no competition.
At the same time, they did nothing to save Mile Square Park here in SoCal.