Don't know about a/c as never been that close to a fast mud mover and certainly not a tech minded person .However on the "Myth Busters" program a couple of weeks ago they did a test with a fast moving train to prove if a person could be sucked onto the tracks by the forces generated. The results showed that the dummy didnt get sucked in but also didnt force it away either but a pushchair with a child got blown off the platform away from the train. Can't remember to trains speed but it was the fastest allowed.