[Chopper Dropper]

Pretty well covered the ground here. One last thought, I instruct, my a**s is in the seat and body will meet the wall at the same time as the irrational student. I hope all instructors whether PCA or any other group have a certain sense of self preservation and will control and guide their student or if neccessary send them home. When I instructed helicopters, at least I had dual controls and never met a student I could not take the controls away from.No such luxury on the track,so one has to be on the watch. As for different marques, it really does not matter.Some ones Corrola may be as much of an investment to him/her as a new GT3 may be to a PCA member. As for getting dusted off, so what! I have seen cheap 914s getting passing signals from all sorts of high powered equipment. I have been blown off many times on the road by Hondas Kias and anything else that may want to "race".
The best passing signals I have come across were at Mosport where there were no run groups, everyone students/instructors, profesional drivers in anything from stock old Golfs to Vipers, GT3> Trains dissipated quicker than at most PCA events in all groups.
Dirk