wow!
that just shows what can be done with some card board and duct tape!!
You have done what I have been thinking about, and probably never would have built it. You wind tunnel is very cool.
I may have to purchase a couple digital scales and a strong fan. the card board and tape is already there. this would really help me set up the aereo package for my velo car. although I do know that things change above 50 mph. down force that worked below 50, failed at over 50 on the track.
can you get the wind to over a true 50 mph with the venturi tunnel?
Wayne