what you say sounds good, but its false.
I can promise you it doesnt make much of a difference regarding wind speed, what makes the most difference is angle.
if you had a nicely angled surface (say, 45*) then yes, you would see more air flow blockage, but full frontal isnt going to be any more than what its rated for.
screen is simply not very realistic material to work with for
extreme blockage.
it was mentioned on here in another thread about using screen for a belly pan, which might actually work,
if you can keep it rigid, not a simple task.
to keep screening rigid at highway speeds (we'll say 60mph) would require a heavy duty frame work, and then would require some way of improving the "grip" of the screen spline that's holding the screen to the frame, most likely silicone.
the screen would deteriorate fairly quickly as well, so plan on replacing it probably once a year.
and if it received even a single rip, your aero would actually be worse than before the belly pan since it would effectively act as a parachute.
sorry for digressing, just thought it would need putting out there before its mentioned
