even though it's massive, it can still only do 70mph over that nozzle size. our newer place in germany can do 100mph over a 2.5 x 2.5m outlet. that uses an axial blower.

as i say, our places are for use for testing air con, so don't need massive speeds. proper wind tunnels for aerodynamic testing like at MIRA etc have far more powerful blowers. one place has 4 propellors from a ww2 lancaster bomber

that just shows you what a waste of time some of the fans that they put in front of the car during rolling road shoot outs are. look at this desk fan that they were using at santa pod classic ford show the other weekend